Add chrome to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@15 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 2743 insertions, 0 deletions

diff --git a/chrome/views/chrome_menu.cc b/chrome/views/chrome_menu.cc
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--- /dev/null
+++ b/chrome/views/chrome_menu.cc
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "chrome/views/chrome_menu.h"
+
+#include <windows.h>
+#include <uxtheme.h>
+#include <Vssym32.h>
+
+#include "base/base_drag_source.h"
+#include "base/gfx/native_theme.h"
+#include "base/gfx/skia_utils.h"
+#include "base/message_loop.h"
+#include "base/task.h"
+#include "base/timer.h"
+#include "base/win_util.h"
+#include "chrome/browser/drag_utils.h"
+#include "chrome/common/gfx/chrome_canvas.h"
+#include "chrome/common/gfx/color_utils.h"
+#include "chrome/common/l10n_util.h"
+#include "chrome/common/os_exchange_data.h"
+#include "chrome/views/border.h"
+#include "chrome/views/hwnd_view_container.h"
+#include "generated_resources.h"
+
+// Margins between the top of the item and the label.
+static const int kItemTopMargin = 3;
+
+// Margins between the bottom of the item and the label.
+static const int kItemBottomMargin = 4;
+
+// Margins between the left of the item and the icon.
+static const int kItemLeftMargin = 4;
+
+// Padding between the label and submenu arrow.
+static const int kLabelToArrowPadding = 10;
+
+// Padding between the arrow and the edge.
+static const int kArrowToEdgePadding = 5;
+
+// Padding between the icon and label.
+static const int kIconToLabelPadding = 8;
+
+// Padding between the gutter and label.
+static const int kGutterToLabel = 5;
+
+// Height of the scroll arrow.
+// This goes up to 4 with large fonts, but this is close enough for now.
+static const int kScrollArrowHeight = 3;
+
+// Size of the check. This comes from the OS.
+static int check_width;
+static int check_height;
+
+// Size of the submenu arrow. This comes from the OS.
+static int arrow_width;
+static int arrow_height;
+
+// Width of the gutter. Only used if render_gutter is true.
+static int gutter_width;
+
+// Margins between the right of the item and the label.
+static int item_right_margin;
+
+// X-coordinate of where the label starts.
+static int label_start;
+
+// Height of the separator.
+static int separator_height;
+
+// Padding around the edges of the submenu.
+static const int kSubmenuBorderSize = 3;
+
+// Amount to inset submenus.
+static const int kSubmenuHorizontalInset = 3;
+
+// Delay, in ms, between when menus are selected are moused over and the menu
+// appears.
+static const int kShowDelay = 400;
+
+// Amount of time from when the drop exits the menu and the menu is hidden.
+static const int kCloseOnExitTime = 1200;
+
+// Height of the drop indicator. This should be an event number.
+static const int kDropIndicatorHeight = 2;
+
+// Color of the drop indicator.
+static const SkColor kDropIndicatorColor = SK_ColorBLACK;
+
+// Whether or not the gutter should be rendered. The gutter is specific to
+// Vista.
+static bool render_gutter = false;
+
+// Max width of a menu. There does not appear to be an OS value for this, yet
+// both IE and FF restrict the max width of a menu.
+static const LONG kMaxMenuWidth = 400;
+
+// Period of the scroll timer (in milliseconds).
+static const int kScrollTimerMS = 30;
+
+// Preferred height of menu items. Reset every time a menu is run.
+static int pref_menu_height;
+
+using gfx::NativeTheme;
+
+namespace ChromeViews {
+
+// Calculates all sizes that we can from the OS.
+//
+// This is invoked prior to Running a menu.
+void UpdateMenuPartSizes() {
+  HDC dc = GetDC(NULL);
+  RECT bounds = { 0, 0, 200, 200 };
+  SIZE check_size;
+  if (NativeTheme::instance()->GetThemePartSize(
+          NativeTheme::MENU, dc, MENU_POPUPCHECK, MC_CHECKMARKNORMAL, &bounds,
+          TS_TRUE, &check_size) == S_OK) {
+    check_width = check_size.cx;
+    check_height = check_size.cy;
+  } else {
+    check_width = GetSystemMetrics(SM_CXMENUCHECK);
+    check_height = GetSystemMetrics(SM_CYMENUCHECK);
+  }
+
+  SIZE arrow_size;
+  if (NativeTheme::instance()->GetThemePartSize(
+          NativeTheme::MENU, dc, MENU_POPUPSUBMENU, MSM_NORMAL, &bounds,
+          TS_TRUE, &arrow_size) == S_OK) {
+    arrow_width = arrow_size.cx;
+    arrow_height = arrow_size.cy;
+  } else {
+    // Sadly I didn't see a specify metrics for this.
+    arrow_width = GetSystemMetrics(SM_CXMENUCHECK);
+    arrow_height = GetSystemMetrics(SM_CYMENUCHECK);
+  }
+
+  SIZE gutter_size;
+  if (NativeTheme::instance()->GetThemePartSize(
+          NativeTheme::MENU, dc, MENU_POPUPGUTTER, MSM_NORMAL, &bounds,
+          TS_TRUE, &gutter_size) == S_OK) {
+    gutter_width = gutter_size.cx;
+    render_gutter = true;
+  } else {
+    gutter_width = 0;
+    render_gutter = false;
+  }
+
+  SIZE separator_size;
+  if (NativeTheme::instance()->GetThemePartSize(
+          NativeTheme::MENU, dc, MENU_POPUPSEPARATOR, MSM_NORMAL, &bounds,
+          TS_TRUE, &separator_size) == S_OK) {
+    separator_height = separator_size.cy;
+  } else {
+    separator_height = GetSystemMetrics(SM_CYMENU) / 2;
+  }
+
+  item_right_margin = kLabelToArrowPadding + arrow_width + kArrowToEdgePadding;
+
+  label_start = kItemLeftMargin + check_width + kIconToLabelPadding;
+  if (render_gutter)
+    label_start += gutter_width + kGutterToLabel;
+
+  ReleaseDC(NULL, dc);
+
+  CSize pref;
+  MenuItemView menu_item(NULL);
+  menu_item.SetTitle(L"blah");  // Text doesn't matter here.
+  menu_item.GetPreferredSize(&pref);
+  pref_menu_height = pref.cy;
+}
+
+namespace {
+
+// Convenience for scrolling the view such that the origin is visible.
+static void ScrollToVisible(View* view) {
+  view->ScrollRectToVisible(0, 0, view->GetWidth(), view->GetHeight());
+}
+
+// MenuScrollTask --------------------------------------------------------------
+
+// MenuScrollTask is used when the SubmenuView does not all fit on screen and
+// the mouse is over the scroll up/down buttons. MenuScrollTask schedules itself
+// with the TimerManager. When Run is invoked MenuScrollTask scrolls
+// appropriately.
+
+class MenuScrollTask : public Task {
+public:
+  MenuScrollTask() : submenu_(NULL) {
+    pixels_per_second_ = pref_menu_height * 20;
+  }
+
+  virtual ~MenuScrollTask() {
+    StopScrolling();
+  }
+
+  virtual void Run() {
+    DCHECK(submenu_);
+    gfx::Rect vis_rect = submenu_->GetVisibleBounds();
+    const int delta_y = static_cast<int>(
+        (Time::Now() - start_scroll_time_).InMilliseconds() *
+        pixels_per_second_ / 1000);
+    int target_y = start_y_;
+    if (is_scrolling_up_)
+      target_y = std::max(0, target_y - delta_y);
+    else
+      target_y = std::min(submenu_->GetHeight() - vis_rect.height(),
+                          target_y + delta_y);
+    submenu_->ScrollRectToVisible(vis_rect.x(), target_y, vis_rect.width(),
+                                  vis_rect.height());
+  }
+
+  void Update(const MenuController::MenuPart& part) {
+    if (!part.is_scroll()) {
+      StopScrolling();
+      return;
+    }
+    DCHECK(part.submenu);
+    SubmenuView* new_menu = part.submenu;
+    bool new_is_up = (part.type == MenuController::MenuPart::SCROLL_UP);
+    if (new_menu == submenu_ && is_scrolling_up_ == new_is_up)
+      return;
+
+    start_scroll_time_ = Time::Now();
+    start_y_ = part.submenu->GetVisibleBounds().y();
+    submenu_ = new_menu;
+    is_scrolling_up_ = new_is_up;
+
+    if (!scrolling_timer_.get()) {
+      scrolling_timer_.reset(new Timer(kScrollTimerMS, this, true));
+      TimerManager* tm = MessageLoop::current()->timer_manager();
+      tm->StartTimer(scrolling_timer_.get());
+    }
+  }
+
+  void StopScrolling() {
+    if (scrolling_timer_.get()) {
+      TimerManager* tm = MessageLoop::current()->timer_manager();
+      tm->StopTimer(scrolling_timer_.get());
+      scrolling_timer_.reset(NULL);
+      submenu_ = NULL;
+    }
+  }
+
+  // The menu being scrolled. Returns null if not scrolling.
+  SubmenuView* submenu() const { return submenu_; }
+
+ private:
+  // SubmenuView being scrolled.
+  SubmenuView* submenu_;
+
+  // Direction scrolling.
+  bool is_scrolling_up_;
+
+  // Timer to periodically scroll.
+  scoped_ptr<Timer> scrolling_timer_;
+
+  // Time we started scrolling at.
+  Time start_scroll_time_;
+
+  // How many pixels to scroll per second.
+  int pixels_per_second_;
+
+  // Y-coordinate of submenu_view_ when scrolling started.
+  int start_y_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(MenuScrollTask);
+};
+
+// MenuScrollButton ------------------------------------------------------------
+
+// MenuScrollButton is used for the scroll buttons when not all menu items fit
+// on screen. MenuScrollButton forwards appropriate events to the
+// MenuController.
+
+class MenuScrollButton : public View {
+ public:
+  explicit MenuScrollButton(SubmenuView* host, bool is_up)
+      : host_(host),
+        is_up_(is_up),
+        // Make our height the same as that of other MenuItemViews.
+        pref_height_(pref_menu_height) {
+  }
+
+  virtual void GetPreferredSize(CSize* out) {
+    out->cx = kScrollArrowHeight * 2 - 1;
+    out->cy = pref_height_;
+  }
+
+  virtual bool CanDrop(const OSExchangeData& data) {
+    DCHECK(host_->GetMenuItem()->GetMenuController());
+    return true;  // Always return true so that drop events are targeted to us.
+  }
+
+  virtual void OnDragEntered(const DropTargetEvent& event) {
+    DCHECK(host_->GetMenuItem()->GetMenuController());
+    host_->GetMenuItem()->GetMenuController()->OnDragEnteredScrollButton(
+        host_, is_up_);
+  }
+
+  virtual int OnDragUpdated(const DropTargetEvent& event) {
+    return DragDropTypes::DRAG_NONE;
+  }
+
+  virtual void OnDragExited() {
+    DCHECK(host_->GetMenuItem()->GetMenuController());
+    host_->GetMenuItem()->GetMenuController()->OnDragExitedScrollButton(host_);
+  }
+
+  virtual int OnPerformDrop(const DropTargetEvent& event) {
+    return DragDropTypes::DRAG_NONE;
+  }
+
+  virtual void Paint(ChromeCanvas* canvas) {
+    HDC dc = canvas->beginPlatformPaint();
+
+    // The background.
+    RECT item_bounds = { 0, 0, GetWidth(), GetHeight() };
+    NativeTheme::instance()->PaintMenuItemBackground(
+        NativeTheme::MENU, dc, MENU_POPUPITEM, MPI_NORMAL, false,
+        &item_bounds);
+
+    // Then the arrow.
+    int x = GetWidth() / 2;
+    int y = (GetHeight() - kScrollArrowHeight) / 2;
+    int delta_y = 1;
+    if (!is_up_) {
+      delta_y = -1;
+      y += kScrollArrowHeight;
+    }
+    SkColor arrow_color = color_utils::GetSysSkColor(COLOR_MENUTEXT);
+    for (int i = 0; i < kScrollArrowHeight; ++i, --x, y += delta_y)
+      canvas->FillRectInt(arrow_color, x, y, (i * 2) + 1, 1);
+
+    canvas->endPlatformPaint();
+  }
+
+ private:
+  // SubmenuView we were created for.
+  SubmenuView* host_;
+
+  // Direction of the button.
+  bool is_up_;
+
+  // Preferred height.
+  int pref_height_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(MenuScrollButton);
+};
+
+// MenuScrollView --------------------------------------------------------------
+
+// MenuScrollView is a viewport for the SubmenuView. It's reason to exist is so
+// that ScrollRectToVisible works.
+//
+// NOTE: It is possible to use ScrollView directly (after making it deal with
+// null scrollbars), but clicking on a child of ScrollView forces the window to
+// become active, which we don't want. As we really only need a fraction of
+// what ScrollView does, we use a one off variant.
+
+class MenuScrollView : public View {
+ public:
+  explicit MenuScrollView(View* child) {
+    AddChildView(child);
+  }
+
+  virtual void ScrollRectToVisible(int x, int y, int width, int height) {
+    // NOTE: this assumes we only want to scroll in the y direction.
+
+    View* child = GetContents();
+    // Convert y to view's coordinates.
+    y -= child->GetY();
+    CSize pref;
+    child->GetPreferredSize(&pref);
+    // Constrain y to make sure we don't show past the bottom of the view.
+    y = std::max(0, std::min(static_cast<int>(pref.cy) - GetHeight(), y));
+    child->SetY(-y);
+  }
+
+  // Returns the contents, which is the SubmenuView.
+  View* GetContents() {
+    return GetChildViewAt(0);
+  }
+
+ private:
+  DISALLOW_EVIL_CONSTRUCTORS(MenuScrollView);
+};
+
+// MenuScrollViewContainer -----------------------------------------------------
+
+// MenuScrollViewContainer contains the SubmenuView (through a MenuScrollView)
+// and two scroll buttons. The scroll buttons are only visible and enabled if
+// the preferred height of the SubmenuView is bigger than our bounds.
+class MenuScrollViewContainer : public View {
+ public:
+  explicit MenuScrollViewContainer(SubmenuView* content_view) {
+    scroll_up_button_ = new MenuScrollButton(content_view, true);
+    scroll_down_button_ = new MenuScrollButton(content_view, false);
+    AddChildView(scroll_up_button_);
+    AddChildView(scroll_down_button_);
+
+    scroll_view_ = new MenuScrollView(content_view);
+    AddChildView(scroll_view_);
+
+    SetBorder(
+        Border::CreateEmptyBorder(kSubmenuBorderSize, kSubmenuBorderSize,
+                                  kSubmenuBorderSize, kSubmenuBorderSize));
+  }
+
+  virtual void Paint(ChromeCanvas* canvas) {
+    HDC dc = canvas->beginPlatformPaint();
+    CRect bounds(0, 0, GetWidth(), GetHeight());
+    NativeTheme::instance()->PaintMenuBackground(
+        NativeTheme::MENU, dc, MENU_POPUPBACKGROUND, 0, &bounds);
+    canvas->endPlatformPaint();
+  }
+
+  View* scroll_down_button() { return scroll_down_button_; }
+
+  View* scroll_up_button() { return scroll_up_button_; }
+
+  virtual void Layout() {
+    gfx::Insets insets = GetInsets();
+    int x = insets.left();
+    int y = insets.top();
+    int width = GetWidth() - insets.width();
+    int content_height = GetHeight() - insets.height();
+    if (!scroll_up_button_->IsVisible()) {
+      scroll_view_->SetBounds(x, y, width, content_height);
+      scroll_view_->Layout();
+      return;
+    }
+
+    CSize pref;
+    scroll_up_button_->GetPreferredSize(&pref);
+    scroll_up_button_->SetBounds(x, y, width, pref.cy);
+    content_height -= pref.cy;
+
+    const int scroll_view_y = y + pref.cy;
+
+    scroll_down_button_->GetPreferredSize(&pref);
+    scroll_down_button_->SetBounds(x, GetHeight() - pref.cy - insets.top(),
+                                   width, pref.cy);
+    content_height -= pref.cy;
+
+    scroll_view_->SetBounds(x, scroll_view_y, width, content_height);
+    scroll_view_->Layout();
+  }
+
+  virtual void DidChangeBounds(const CRect& previous, const CRect& current) {
+    CSize content_pref;
+    scroll_view_->GetContents()->GetPreferredSize(&content_pref);
+    scroll_up_button_->SetVisible(content_pref.cy > GetHeight());
+    scroll_down_button_->SetVisible(content_pref.cy > GetHeight());
+  }
+
+  virtual void GetPreferredSize(CSize* out) {
+    scroll_view_->GetContents()->GetPreferredSize(out);
+    gfx::Insets insets = GetInsets();
+    out->cx += insets.width();
+    out->cy += insets.height();
+  }
+
+ private:
+  // The scroll buttons.
+  View* scroll_up_button_;
+  View* scroll_down_button_;
+
+  // The scroll view.
+  MenuScrollView* scroll_view_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(MenuScrollViewContainer);
+};
+
+// MenuSeparator ---------------------------------------------------------------
+
+// Renders a separator.
+
+class MenuSeparator : public View {
+ public:
+  MenuSeparator() {
+  }
+
+  void Paint(ChromeCanvas* canvas) {
+    // The gutter is rendered before the background.
+    int start_x = 0;
+    int start_y = GetHeight() / 3;
+    HDC dc = canvas->beginPlatformPaint();
+    if (render_gutter) {
+      // If render_gutter is true, we're on Vista and need to render the
+      // gutter, then indent the separator from the gutter.
+      RECT gutter_bounds = { label_start - kGutterToLabel - gutter_width, 0, 0,
+                              GetHeight() };
+      gutter_bounds.right = gutter_bounds.left + gutter_width;
+      NativeTheme::instance()->PaintMenuGutter(dc, MENU_POPUPGUTTER, MPI_NORMAL,
+                                               &gutter_bounds);
+      start_x = gutter_bounds.left + gutter_width;
+      start_y = 0;
+    }
+    RECT separator_bounds = { start_x, start_y, GetWidth(), GetHeight() };
+    NativeTheme::instance()->PaintMenuSeparator(dc, MENU_POPUPSEPARATOR,
+                                                MPI_NORMAL, &separator_bounds);
+    canvas->endPlatformPaint();
+  }
+
+  void GetPreferredSize(CSize* out) {
+    out->cx = 10; // Just in case we're the only item in a menu.
+    out->cy = separator_height;
+  }
+
+ private:
+  DISALLOW_EVIL_CONSTRUCTORS(MenuSeparator);
+};
+
+// MenuHostRootView ----------------------------------------------------------
+
+// MenuHostRootView is the RootView of the window showing the menu.
+// SubmenuView's scroll view is added as a child of MenuHostRootView.
+// MenuHostRootView forwards relevant events to the MenuController.
+//
+// As all the menu items are owned by the root menu item, care must be taken
+// such that when MenuHostRootView is deleted it doesn't delete the menu items.
+
+class MenuHostRootView : public RootView {
+ public:
+  explicit MenuHostRootView(ViewContainer* container,
+                            SubmenuView* submenu)
+      : RootView(container, true),
+        submenu_(submenu),
+        forward_drag_to_menu_controller_(true),
+        suspend_events_(false) {
+#ifdef DEBUG_MENU
+  DLOG(INFO) << " new MenuHostRootView " << this;
+#endif
+  }
+
+  virtual bool OnMousePressed(const MouseEvent& event) {
+    if (suspend_events_)
+      return true;
+
+    forward_drag_to_menu_controller_ =
+        ((event.GetX() < 0 || event.GetY() < 0 || event.GetX() >= GetWidth() ||
+          event.GetY() >= GetHeight()) ||
+         !RootView::OnMousePressed(event));
+    if (forward_drag_to_menu_controller_)
+      GetMenuController()->OnMousePressed(submenu_, event);
+    return true;
+  }
+
+  virtual bool OnMouseDragged(const MouseEvent& event) {
+    if (suspend_events_)
+      return true;
+
+    if (forward_drag_to_menu_controller_) {
+#ifdef DEBUG_MENU
+      DLOG(INFO) << " MenuHostRootView::OnMouseDragged source=" << submenu_;
+#endif
+      GetMenuController()->OnMouseDragged(submenu_, event);
+      return true;
+    }
+    return RootView::OnMouseDragged(event);
+  }
+
+  virtual void OnMouseReleased(const MouseEvent& event, bool canceled) {
+    if (suspend_events_)
+      return;
+
+    RootView::OnMouseReleased(event, canceled);
+    if (forward_drag_to_menu_controller_) {
+      if (canceled) {
+        GetMenuController()->Cancel(true);
+      } else {
+        GetMenuController()->OnMouseReleased(submenu_, event);
+      }
+      forward_drag_to_menu_controller_ = false;
+    }
+  }
+
+  virtual void OnMouseMoved(const MouseEvent& event) {
+    if (suspend_events_)
+      return;
+
+    RootView::OnMouseMoved(event);
+    GetMenuController()->OnMouseMoved(submenu_, event);
+  }
+
+  virtual void ProcessOnMouseExited() {
+    if (suspend_events_)
+      return;
+
+    RootView::ProcessOnMouseExited();
+  }
+
+  virtual bool ProcessMouseWheelEvent(const MouseWheelEvent& e) {
+    // RootView::ProcessMouseWheelEvent forwards to the focused view. We don't
+    // have a focused view, so we need to override this then forward to
+    // the menu.
+    return submenu_->OnMouseWheel(e);
+  }
+
+  void SuspendEvents() {
+    suspend_events_ = true;
+  }
+
+ private:
+  MenuController* GetMenuController() {
+    return submenu_->GetMenuItem()->GetMenuController();
+  }
+
+  /// The SubmenuView we contain.
+  SubmenuView* submenu_;
+
+  // Whether mouse dragged/released should be forwarded to the MenuController.
+  bool forward_drag_to_menu_controller_;
+
+  // Whether events are suspended. If true, no events are forwarded to the
+  // MenuController.
+  bool suspend_events_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(MenuHostRootView);
+};
+
+// MenuHost ------------------------------------------------------------------
+
+// MenuHost is the window responsible for showing a single menu.
+//
+// Similar to MenuHostRootView, care must be taken such that when MenuHost is
+// deleted, it doesn't delete the menu items. MenuHost is closed via a
+// DelayedClosed, which avoids timing issues with deleting the window while
+// capture or events are directed at it.
+
+class MenuHost : public HWNDViewContainer {
+ public:
+  MenuHost(SubmenuView* submenu)
+      : closed_(false),
+        submenu_(submenu),
+        owns_capture_(false) {
+    set_window_style(WS_POPUP);
+    set_initial_class_style(
+        (win_util::GetWinVersion() < win_util::WINVERSION_XP) ?
+        0 : CS_DROPSHADOW);
+    is_mouse_down_ =
+        ((GetKeyState(VK_LBUTTON) & 0x80) ||
+         (GetKeyState(VK_RBUTTON) & 0x80) ||
+         (GetKeyState(VK_MBUTTON) & 0x80) ||
+         (GetKeyState(VK_XBUTTON1) & 0x80) ||
+         (GetKeyState(VK_XBUTTON2) & 0x80));
+    // Mouse clicks shouldn't give us focus.
+    set_window_ex_style(WS_EX_TOPMOST | WS_EX_NOACTIVATE);
+  }
+
+  void Init(HWND parent,
+            const gfx::Rect& bounds,
+            View* contents_view,
+            bool do_capture) {
+    HWNDViewContainer::Init(parent, bounds, contents_view, true);
+    // We don't want to take focus away from the hosting window.
+    ShowWindow(SW_SHOWNA);
+    owns_capture_ = do_capture;
+    if (do_capture) {
+      SetCapture();
+      has_capture_ = true;
+#ifdef DEBUG_MENU
+      DLOG(INFO) << "Doing capture";
+#endif
+    }
+  }
+
+  virtual void Hide() {
+    if (closed_) {
+      // We're already closed, nothing to do.
+      // This is invoked twice if the first time just hid us, and the second
+      // time deleted Closed (deleted) us.
+      return;
+    }
+    // The menus are freed separately, and possibly before the window is closed,
+    // remove them so that View doesn't try to access deleted objects.
+    static_cast<MenuHostRootView*>(GetRootView())->SuspendEvents();
+    GetRootView()->RemoveAllChildViews(false);
+    closed_ = true;
+    ReleaseCapture();
+    HWNDViewContainer::Hide();
+  }
+
+  virtual void OnCaptureChanged(HWND hwnd) {
+    HWNDViewContainer::OnCaptureChanged(hwnd);
+    owns_capture_ = false;
+#ifdef DEBUG_MENU
+    DLOG(INFO) << "Capture changed";
+#endif
+  }
+
+  void ReleaseCapture() {
+    if (owns_capture_) {
+#ifdef DEBUG_MENU
+      DLOG(INFO) << "released capture";
+#endif
+      owns_capture_ = false;
+      ::ReleaseCapture();
+    }
+  }
+
+ protected:
+  // Overriden to create MenuHostRootView.
+  virtual RootView* CreateRootView() {
+    return new MenuHostRootView(this, submenu_);
+  }
+
+  virtual void OnCancelMode() {
+    if (!closed_) {
+#ifdef DEBUG_MENU
+      DLOG(INFO) << "OnCanceMode, closing menu";
+#endif
+      submenu_->GetMenuItem()->GetMenuController()->Cancel(true);
+    }
+  }
+
+  // Overriden to return false, we do NOT want to release capture on mouse
+  // release.
+  virtual bool ReleaseCaptureOnMouseReleased() {
+    return false;
+  }
+
+ private:
+  // If true, we've been closed.
+  bool closed_;
+
+  // If true, we own the capture and need to release it.
+  bool owns_capture_;
+
+  // The view we contain.
+  SubmenuView* submenu_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(MenuHost);
+};
+
+// EmptyMenuMenuItem ---------------------------------------------------------
+
+// EmptyMenuMenuItem is used when a menu has no menu items. EmptyMenuMenuItem
+// is itself a MenuItemView, but it uses a different ID so that it isn't
+// identified as a MenuItemView.
+
+class EmptyMenuMenuItem : public MenuItemView {
+ public:
+  // ID used for EmptyMenuMenuItem.
+  static const int kEmptyMenuItemViewID;
+
+  EmptyMenuMenuItem(MenuItemView* parent) : MenuItemView(parent, 0, NORMAL) {
+    SetTitle(l10n_util::GetString(IDS_MENU_EMPTY_SUBMENU));
+    // Set this so that we're not identified as a normal menu item.
+    SetID(kEmptyMenuItemViewID);
+    SetEnabled(false);
+  }
+
+ private:
+  DISALLOW_EVIL_CONSTRUCTORS(EmptyMenuMenuItem);
+};
+
+// static
+const int EmptyMenuMenuItem::kEmptyMenuItemViewID =
+    MenuItemView::kMenuItemViewID + 1;
+
+}  // namespace
+
+// SubmenuView ---------------------------------------------------------------
+
+SubmenuView::SubmenuView(MenuItemView* parent)
+    : parent_menu_item_(parent),
+      host_(NULL),
+      drop_item_(NULL),
+      scroll_view_container_(NULL) {
+  DCHECK(parent);
+  // We'll delete ourselves, otherwise the ScrollView would delete us on close.
+  SetParentOwned(false);
+}
+
+SubmenuView::~SubmenuView() {
+  DCHECK(!host_);
+  delete scroll_view_container_;
+}
+
+int SubmenuView::GetMenuItemCount() {
+  int count = 0;
+  for (int i = 0; i < GetChildViewCount(); ++i) {
+    if (GetChildViewAt(i)->GetID() == MenuItemView::kMenuItemViewID)
+      count++;
+  }
+  return count;
+}
+
+MenuItemView* SubmenuView::GetMenuItemAt(int index) {
+  for (int i = 0, count = 0; i < GetChildViewCount(); ++i) {
+    if (GetChildViewAt(i)->GetID() == MenuItemView::kMenuItemViewID &&
+        count++ == index) {
+      return static_cast<MenuItemView*>(GetChildViewAt(i));
+    }
+  }
+  NOTREACHED();
+  return NULL;
+}
+
+void SubmenuView::Layout() {
+  // We're in a ScrollView, and need to set our width/height ourselves.
+  View* parent = GetParent();
+  if (!parent)
+    return;
+  CSize pref;
+  GetPreferredSize(&pref);
+  SetBounds(GetX(), GetY(), parent->GetWidth(), pref.cy);
+
+  gfx::Insets insets = GetInsets();
+  int x = insets.left();
+  int y = insets.top();
+  int menu_item_width = GetWidth() - insets.width();
+  for (int i = 0; i < GetChildViewCount(); ++i) {
+    View* child = GetChildViewAt(i);
+    CSize child_pref_size;
+    child->GetPreferredSize(&child_pref_size);
+    child->SetBounds(x, y, menu_item_width, child_pref_size.cy);
+    y += child_pref_size.cy;
+  }
+}
+
+void SubmenuView::GetPreferredSize(CSize* out) {
+  if (GetChildViewCount() == 0) {
+    out->SetSize(0, 0);
+    return;
+  }
+
+  int max_width = 0;
+  int height = 0;
+  for (int i = 0; i < GetChildViewCount(); ++i) {
+    View* child = GetChildViewAt(i);
+    CSize child_pref_size;
+    child->GetPreferredSize(&child_pref_size);
+    max_width = std::max(max_width, static_cast<int>(child_pref_size.cx));
+    height += child_pref_size.cy;
+  }
+  gfx::Insets insets = GetInsets();
+  out->SetSize(max_width + insets.width(), height + insets.height());
+}
+
+void SubmenuView::DidChangeBounds(const CRect& previous, const CRect& current) {
+  SchedulePaint();
+}
+
+void SubmenuView::PaintChildren(ChromeCanvas* canvas) {
+  View::PaintChildren(canvas);
+
+  if (drop_item_ && drop_position_ != MenuDelegate::DROP_ON)
+    PaintDropIndicator(canvas, drop_item_, drop_position_);
+}
+
+bool SubmenuView::CanDrop(const OSExchangeData& data) {
+  DCHECK(GetMenuItem()->GetMenuController());
+  return GetMenuItem()->GetMenuController()->CanDrop(this, data);
+}
+
+void SubmenuView::OnDragEntered(const DropTargetEvent& event) {
+  DCHECK(GetMenuItem()->GetMenuController());
+  GetMenuItem()->GetMenuController()->OnDragEntered(this, event);
+}
+
+int SubmenuView::OnDragUpdated(const DropTargetEvent& event) {
+  DCHECK(GetMenuItem()->GetMenuController());
+  return GetMenuItem()->GetMenuController()->OnDragUpdated(this, event);
+}
+
+void SubmenuView::OnDragExited() {
+  DCHECK(GetMenuItem()->GetMenuController());
+  GetMenuItem()->GetMenuController()->OnDragExited(this);
+}
+
+int SubmenuView::OnPerformDrop(const DropTargetEvent& event) {
+  DCHECK(GetMenuItem()->GetMenuController());
+  return GetMenuItem()->GetMenuController()->OnPerformDrop(this, event);
+}
+
+bool SubmenuView::OnMouseWheel(const MouseWheelEvent& e) {
+  gfx::Rect vis_bounds = GetVisibleBounds();
+  int menu_item_count = GetMenuItemCount();
+  if (vis_bounds.height() == GetHeight() || !menu_item_count) {
+    // All menu items are visible, nothing to scroll.
+    return true;
+  }
+
+  // Find the index of the first menu item whose y-coordinate is >= visible
+  // y-coordinate.
+  int first_vis_index = -1;
+  for (int i = 0; i < menu_item_count; ++i) {
+    MenuItemView* menu_item = GetMenuItemAt(i);
+    if (menu_item->GetY() == vis_bounds.y()) {
+      first_vis_index = i;
+      break;
+    } else if (menu_item->GetY() > vis_bounds.y()) {
+      first_vis_index = std::max(0, i - 1);
+      break;
+    }
+  }
+  if (first_vis_index == -1)
+    return true;
+
+  // If the first item isn't entirely visible, make it visible, otherwise make
+  // the next/previous one entirely visible.
+  int delta = abs(e.GetOffset() / WHEEL_DELTA);
+  bool scroll_up = (e.GetOffset() > 0);
+  while (delta-- > 0) {
+    int scroll_amount = 0;
+    if (scroll_up) {
+      if (GetMenuItemAt(first_vis_index)->GetY() == vis_bounds.y()) {
+        if (first_vis_index != 0) {
+          scroll_amount = GetMenuItemAt(first_vis_index - 1)->GetY() -
+                          vis_bounds.y();
+          first_vis_index--;
+        } else {
+          break;
+        }
+      } else {
+        scroll_amount = GetMenuItemAt(first_vis_index)->GetY() - vis_bounds.y();
+      }
+    } else {
+      if (first_vis_index + 1 == GetMenuItemCount())
+        break;
+      scroll_amount = GetMenuItemAt(first_vis_index + 1)->GetY() -
+                      vis_bounds.y();
+      if (GetMenuItemAt(first_vis_index)->GetY() == vis_bounds.y())
+        first_vis_index++;
+    }
+    ScrollRectToVisible(0, vis_bounds.y() + scroll_amount, vis_bounds.width(),
+                        vis_bounds.height());
+    vis_bounds = GetVisibleBounds();
+  }
+
+  return true;
+}
+
+void SubmenuView::ShowAt(HWND parent,
+                         const gfx::Rect& bounds,
+                         bool do_capture) {
+  DCHECK(!host_);
+  host_ = new MenuHost(this);
+  // Force construction of the scroll view container.
+  GetScrollViewContainer();
+  // Make sure the first row is visible.
+  ScrollRectToVisible(0, 0, 1, 1);
+  host_->Init(parent, bounds, scroll_view_container_, do_capture);
+}
+
+void SubmenuView::Close(bool destroy_host) {
+  if (host_) {
+    if (destroy_host) {
+      host_->Close();
+      host_ = NULL;
+    } else {
+      host_->Hide();
+    }
+  }
+}
+
+void SubmenuView::ReleaseCapture() {
+  host_->ReleaseCapture();
+}
+
+void SubmenuView::SetDropMenuItem(MenuItemView* item,
+                                  MenuDelegate::DropPosition position) {
+  if (drop_item_ == item && drop_position_ == position)
+    return;
+  SchedulePaintForDropIndicator(drop_item_, drop_position_);
+  drop_item_ = item;
+  drop_position_ = position;
+  SchedulePaintForDropIndicator(drop_item_, drop_position_);
+}
+
+bool SubmenuView::GetShowSelection(MenuItemView* item) {
+  if (drop_item_ == NULL)
+    return true;
+  // Something is being dropped on one of this menus items. Show the
+  // selection if the drop is on the passed in item and the drop position is
+  // ON.
+  return (drop_item_ == item && drop_position_ == MenuDelegate::DROP_ON);
+}
+
+MenuScrollViewContainer* SubmenuView::GetScrollViewContainer() {
+  if (!scroll_view_container_) {
+    scroll_view_container_ = new MenuScrollViewContainer(this);
+    // Otherwise MenuHost would delete us.
+    scroll_view_container_->SetParentOwned(false);
+  }
+  return scroll_view_container_;
+}
+
+void SubmenuView::PaintDropIndicator(ChromeCanvas* canvas,
+                                     MenuItemView* item,
+                                     MenuDelegate::DropPosition position) {
+  if (position == MenuDelegate::DROP_NONE)
+    return;
+
+  gfx::Rect bounds = CalculateDropIndicatorBounds(item, position);
+  canvas->FillRectInt(kDropIndicatorColor, bounds.x(), bounds.y(),
+                      bounds.width(), bounds.height());
+}
+
+void SubmenuView::SchedulePaintForDropIndicator(
+    MenuItemView* item,
+    MenuDelegate::DropPosition position) {
+  if (item == NULL)
+    return;
+
+  if (position == MenuDelegate::DROP_ON) {
+    item->SchedulePaint();
+  } else if (position != MenuDelegate::DROP_NONE) {
+    gfx::Rect bounds = CalculateDropIndicatorBounds(item, position);
+    SchedulePaint(bounds.x(), bounds.y(), bounds.width(), bounds.height());
+  }
+}
+
+gfx::Rect SubmenuView::CalculateDropIndicatorBounds(
+    MenuItemView* item,
+    MenuDelegate::DropPosition position) {
+  DCHECK(position != MenuDelegate::DROP_NONE);
+  CRect item_bounds_c;
+  item->GetBounds(&item_bounds_c);
+  gfx::Rect item_bounds(item_bounds_c);
+  switch (position) {
+    case MenuDelegate::DROP_BEFORE:
+      item_bounds.Offset(0, -kDropIndicatorHeight / 2);
+      item_bounds.set_height(kDropIndicatorHeight);
+      return item_bounds;
+
+    case MenuDelegate::DROP_AFTER:
+      item_bounds.Offset(0, item_bounds.height() - kDropIndicatorHeight / 2);
+      item_bounds.set_height(kDropIndicatorHeight);
+      return item_bounds;
+
+    default:
+      // Don't render anything for on.
+      return gfx::Rect();
+  }
+}
+
+// MenuItemView ---------------------------------------------------------------
+
+//  static
+const int MenuItemView::kMenuItemViewID = 1001;
+
+//  static
+const int MenuItemView::kDropBetweenPixels = 5;
+
+MenuItemView::MenuItemView(MenuDelegate* delegate) {
+  DCHECK(delegate_);
+  Init(NULL, 0, SUBMENU, delegate);
+}
+
+MenuItemView::~MenuItemView() {
+  if (controller_) {
+    // We're currently showing.
+
+    // We can't delete ourselves while we're blocking.
+    DCHECK(!controller_->IsBlockingRun());
+
+    // Invoking Cancel is going to call us back and notify the delegate.
+    // Notifying the delegate from the destructor can be problematic. To avoid
+    // this the delegate is set to NULL.
+    delegate_ = NULL;
+
+    controller_->Cancel(true);
+  }
+  delete submenu_;
+}
+
+void MenuItemView::RunMenuAt(HWND parent,
+                             const gfx::Rect& bounds,
+                             AnchorPosition anchor,
+                             bool show_mnemonics) {
+  PrepareForRun(show_mnemonics);
+
+  int mouse_event_flags;
+
+  MenuController* controller = MenuController::GetActiveInstance();
+  bool owns_controller = false;
+  if (!controller) {
+    // No menus are showing, show one.
+    controller = new MenuController(true);
+    MenuController::SetActiveInstance(controller);
+    owns_controller = true;
+  } else {
+    // A menu is already showing, use the same controller.
+
+    // Don't support blocking from within non-blocking.
+    DCHECK(controller->IsBlockingRun());
+  }
+
+  controller_ = controller;
+
+  // Run the loop.
+  MenuItemView* result =
+      controller->Run(parent, this, bounds, anchor, &mouse_event_flags);
+
+  RemoveEmptyMenus();
+
+  controller_ = NULL;
+
+  if (owns_controller) {
+    // We created the controller and need to delete it.
+    if (MenuController::GetActiveInstance() == controller)
+      MenuController::SetActiveInstance(NULL);
+    delete controller;
+  }
+  // Make sure all the windows we created to show the menus have been
+  // destroyed.
+  DestroyAllMenuHosts();
+  if (result && delegate_)
+    delegate_->ExecuteCommand(result->GetCommand(), mouse_event_flags);
+}
+
+void MenuItemView::RunMenuForDropAt(HWND parent,
+                                    const gfx::Rect& bounds,
+                                    AnchorPosition anchor) {
+  PrepareForRun(false);
+
+  // If there is a menu, hide it so that only one menu is shown during dnd.
+  MenuController* current_controller = MenuController::GetActiveInstance();
+  if (current_controller) {
+    current_controller->Cancel(true);
+  }
+
+  // Always create a new controller for non-blocking.
+  controller_ = new MenuController(false);
+
+  // Set the instance, that way it can be canceled by another menu.
+  MenuController::SetActiveInstance(controller_);
+
+  controller_->Run(parent, this, bounds, anchor, NULL);
+}
+
+void MenuItemView::Cancel() {
+  if (controller_ && !canceled_) {
+    canceled_ = true;
+    controller_->Cancel(true);
+  }
+}
+
+SubmenuView* MenuItemView::CreateSubmenu() {
+  if (!submenu_)
+    submenu_ = new SubmenuView(this);
+  return submenu_;
+}
+
+void MenuItemView::SetSelected(bool selected) {
+  selected_ = selected;
+  SchedulePaint();
+}
+
+void MenuItemView::SetIcon(const SkBitmap& icon, int item_id) {
+  MenuItemView* item = GetDescendantByID(item_id);
+  DCHECK(item);
+  item->SetIcon(icon);
+}
+
+void MenuItemView::SetIcon(const SkBitmap& icon) {
+  icon_ = icon;
+  SchedulePaint();
+}
+
+void MenuItemView::Paint(ChromeCanvas* canvas) {
+  Paint(canvas, false);
+}
+
+void MenuItemView::GetPreferredSize(CSize* out) {
+  out->cx = font_.GetStringWidth(title_) + label_start + item_right_margin;
+  out->cy = font_.height() + kItemBottomMargin + kItemTopMargin;
+}
+
+MenuController* MenuItemView::GetMenuController() {
+  return GetRootMenuItem()->controller_;
+}
+
+MenuDelegate* MenuItemView::GetDelegate() {
+  return GetRootMenuItem()->delegate_;
+}
+
+MenuItemView* MenuItemView::GetRootMenuItem() {
+  MenuItemView* item = this;
+  while (item) {
+    MenuItemView* parent = item->GetParentMenuItem();
+    if (!parent)
+      return item;
+    item = parent;
+  }
+  NOTREACHED();
+  return NULL;
+}
+
+wchar_t MenuItemView::GetMnemonic() {
+  const std::wstring& title = GetTitle();
+  size_t index = 0;
+  do {
+    index = title.find('&', index);
+    if (index != std::wstring::npos) {
+      if (index + 1 != title.size() && title[index + 1] != '&')
+        return title[index + 1];
+      index++;
+    }
+  } while (index != std::wstring::npos);
+  return 0;
+}
+
+MenuItemView::MenuItemView(MenuItemView* parent,
+                           int command,
+                           MenuItemView::Type type) {
+  Init(parent, command, type, NULL);
+}
+
+void MenuItemView::Init(MenuItemView* parent,
+                        int command,
+                        MenuItemView::Type type,
+                        MenuDelegate* delegate) {
+  delegate_ = delegate;
+  controller_ = NULL;
+  canceled_ = false;
+  parent_menu_item_ = parent;
+  type_ = type;
+  selected_ = false;
+  command_ = command;
+  submenu_ = NULL;
+  // Assign our ID, this allows SubmenuItemView to find MenuItemViews.
+  SetID(kMenuItemViewID);
+
+  MenuDelegate* root_delegate = GetDelegate();
+  if (root_delegate)
+    SetEnabled(root_delegate->IsCommandEnabled(command));
+}
+
+MenuItemView* MenuItemView::AppendMenuItemInternal(int item_id,
+                                                   const std::wstring& label,
+                                                   const SkBitmap& icon,
+                                                   Type type) {
+  if (!submenu_)
+    CreateSubmenu();
+  if (type == SEPARATOR) {
+    submenu_->AddChildView(new MenuSeparator());
+    return NULL;
+  }
+  MenuItemView* item = new MenuItemView(this, item_id, type);
+  if (label.empty() && GetDelegate())
+    item->SetTitle(GetDelegate()->GetLabel(item_id));
+  else
+    item->SetTitle(label);
+  item->SetIcon(icon);
+  if (type == SUBMENU)
+    item->CreateSubmenu();
+  submenu_->AddChildView(item);
+  return item;
+}
+
+MenuItemView* MenuItemView::GetDescendantByID(int id) {
+  if (GetCommand() == id)
+    return this;
+  if (!HasSubmenu())
+    return NULL;
+  for (int i = 0; i < GetSubmenu()->GetChildViewCount(); ++i) {
+    View* child = GetSubmenu()->GetChildViewAt(i);
+    if (child->GetID() == MenuItemView::kMenuItemViewID) {
+      MenuItemView* result = static_cast<MenuItemView*>(child)->
+          GetDescendantByID(id);
+      if (result)
+        return result;
+    }
+  }
+  return NULL;
+}
+
+void MenuItemView::DropMenuClosed(bool notify_delegate) {
+  DCHECK(controller_);
+  DCHECK(!controller_->IsBlockingRun());
+  if (MenuController::GetActiveInstance() == controller_)
+    MenuController::SetActiveInstance(NULL);
+  delete controller_;
+  controller_ = NULL;
+
+  RemoveEmptyMenus();
+
+  if (notify_delegate && delegate_) {
+    // Our delegate is null when invoked from the destructor.
+    delegate_->DropMenuClosed(this);
+  }
+  // WARNING: its possible the delegate deleted us at this point.
+}
+
+void MenuItemView::PrepareForRun(bool show_mnemonics) {
+  // Currently we only support showing the root.
+  DCHECK(!parent_menu_item_);
+
+  // Don't invoke run from within run on the same menu.
+  DCHECK(!controller_);
+
+  // Force us to have a submenu.
+  CreateSubmenu();
+
+  canceled_ = false;
+
+  show_mnemonics_ = show_mnemonics;
+
+  AddEmptyMenus();
+
+  UpdateMenuPartSizes();
+}
+
+int MenuItemView::GetDrawStringFlags() {
+  int flags = 0;
+  if (UILayoutIsRightToLeft())
+    flags |= ChromeCanvas::TEXT_ALIGN_RIGHT;
+  else
+    flags |= ChromeCanvas::TEXT_ALIGN_LEFT;
+
+  return flags |
+      (show_mnemonics_ ? ChromeCanvas::SHOW_PREFIX : ChromeCanvas::HIDE_PREFIX);
+}
+
+void MenuItemView::AddEmptyMenus() {
+  DCHECK(HasSubmenu());
+  if (submenu_->GetChildViewCount() == 0) {
+    submenu_->AddChildView(0, new EmptyMenuMenuItem(this));
+  } else {
+    for (int i = 0, item_count = submenu_->GetMenuItemCount(); i < item_count;
+         ++i) {
+      MenuItemView* child = submenu_->GetMenuItemAt(i);
+      if (child->HasSubmenu())
+        child->AddEmptyMenus();
+    }
+  }
+}
+
+void MenuItemView::RemoveEmptyMenus() {
+  DCHECK(HasSubmenu());
+  // Iterate backwards as we may end up removing views, which alters the child
+  // view count.
+  for (int i = submenu_->GetChildViewCount() - 1; i >= 0; --i) {
+    View* child = submenu_->GetChildViewAt(i);
+    if (child->GetID() == MenuItemView::kMenuItemViewID) {
+      MenuItemView* menu_item = static_cast<MenuItemView*>(child);
+      if (menu_item->HasSubmenu())
+        menu_item->RemoveEmptyMenus();
+    } else if (child->GetID() == EmptyMenuMenuItem::kEmptyMenuItemViewID) {
+      submenu_->RemoveChildView(child);
+    }
+  }
+}
+
+void MenuItemView::AdjustBoundsForRTLUI(RECT* rect) const {
+  gfx::Rect mirrored_rect(*rect);
+  mirrored_rect.set_x(MirroredLeftPointForRect(mirrored_rect));
+  *rect = mirrored_rect.ToRECT();
+}
+
+void MenuItemView::Paint(ChromeCanvas* canvas, bool for_drag) {
+  bool render_selection =
+      (!for_drag && IsSelected() &&
+       parent_menu_item_->GetSubmenu()->GetShowSelection(this));
+  int state = render_selection ? MPI_HOT :
+                                 (IsEnabled() ? MPI_NORMAL : MPI_DISABLED);
+  HDC dc = canvas->beginPlatformPaint();
+
+  // The gutter is rendered before the background.
+  if (render_gutter && !for_drag) {
+    RECT gutter_bounds = { label_start - kGutterToLabel - gutter_width, 0, 0,
+                           GetHeight() };
+    gutter_bounds.right = gutter_bounds.left + gutter_width;
+    AdjustBoundsForRTLUI(&gutter_bounds);
+    NativeTheme::instance()->PaintMenuGutter(dc, MENU_POPUPGUTTER, MPI_NORMAL, &gutter_bounds);
+  }
+
+  // Render the background.
+  if (!for_drag) {
+    RECT item_bounds = { 0, 0, GetWidth(), GetHeight() };
+    AdjustBoundsForRTLUI(&item_bounds);
+    NativeTheme::instance()->PaintMenuItemBackground(
+        NativeTheme::MENU, dc, MENU_POPUPITEM, state, render_selection,
+        &item_bounds);
+  }
+
+  int icon_x = kItemLeftMargin;
+  int icon_y = kItemTopMargin + (GetHeight() - kItemTopMargin -
+                                 kItemBottomMargin - check_height) / 2;
+  int icon_height = check_height;
+  int icon_width = check_width;
+
+  if (type_ == CHECKBOX && GetDelegate()->IsItemChecked(GetCommand())) {
+    // Draw the check background.
+    RECT check_bg_bounds = { 0, 0, icon_x + icon_width, GetHeight() };
+    const int bg_state = IsEnabled() ? MCB_NORMAL : MCB_DISABLED;
+    AdjustBoundsForRTLUI(&check_bg_bounds);
+    NativeTheme::instance()->PaintMenuCheckBackground(
+        NativeTheme::MENU, dc, MENU_POPUPCHECKBACKGROUND, bg_state,
+        &check_bg_bounds);
+
+    // And the check.
+    RECT check_bounds = { icon_x, icon_y, icon_x + icon_width,
+                          icon_y + icon_height };
+    const int check_state = IsEnabled() ? MC_CHECKMARKNORMAL :
+                                          MC_CHECKMARKDISABLED;
+    AdjustBoundsForRTLUI(&check_bounds);
+    NativeTheme::instance()->PaintMenuCheck(
+        NativeTheme::MENU, dc, MENU_POPUPCHECK, check_state, &check_bounds,
+        render_selection);
+  }
+
+  // Render the foreground.
+  // Menu color is specific to Vista, fallback to classic colors if can't
+  // get color.
+  int default_sys_color = render_selection ? COLOR_HIGHLIGHTTEXT :
+      (IsEnabled() ? COLOR_MENUTEXT : COLOR_GRAYTEXT);
+  SkColor fg_color = NativeTheme::instance()->GetThemeColorWithDefault(
+      NativeTheme::MENU, MENU_POPUPITEM, state, TMT_TEXTCOLOR, default_sys_color);
+  int width = GetWidth() - item_right_margin - label_start;
+  gfx::Rect text_bounds(label_start, kItemTopMargin, width, font_.height());
+  text_bounds.set_x(MirroredLeftPointForRect(text_bounds));
+  canvas->DrawStringInt(GetTitle(), font_, fg_color, text_bounds.x(),
+                        text_bounds.y(), text_bounds.width(),
+                        text_bounds.height(),
+                        GetRootMenuItem()->GetDrawStringFlags());
+
+  if (icon_.width() > 0) {
+    gfx::Rect icon_bounds(kItemLeftMargin,
+                          kItemTopMargin + (GetHeight() - kItemTopMargin -
+                          kItemBottomMargin - icon_.height()) / 2,
+                          icon_.width(),
+                          icon_.height());
+    icon_bounds.set_x(MirroredLeftPointForRect(icon_bounds));
+    canvas->DrawBitmapInt(icon_, icon_bounds.x(), icon_bounds.y());
+  }
+
+  if (HasSubmenu()) {
+    int state_id = IsEnabled() ? MSM_NORMAL : MSM_DISABLED;
+    RECT arrow_bounds = { GetWidth() - item_right_margin + kLabelToArrowPadding,
+                          0, 0, GetHeight() };
+    arrow_bounds.right = arrow_bounds.left + arrow_width;
+    AdjustBoundsForRTLUI(&arrow_bounds);
+
+    // If our sub menus open from right to left (which is the case when the
+    // locale is RTL) then we should make sure the menu arrow points to the
+    // right direction.
+    NativeTheme::MenuArrowDirection arrow_direction;
+    if (UILayoutIsRightToLeft())
+      arrow_direction = NativeTheme::LEFT_POINTING_ARROW;
+    else
+      arrow_direction = NativeTheme::RIGHT_POINTING_ARROW;
+
+    NativeTheme::instance()->PaintMenuArrow(
+        NativeTheme::MENU, dc, MENU_POPUPSUBMENU, state_id, &arrow_bounds,
+        arrow_direction, render_selection);
+  }
+  canvas->endPlatformPaint();
+}
+
+void MenuItemView::DestroyAllMenuHosts() {
+  if (!HasSubmenu())
+    return;
+
+  submenu_->Close(true);
+  for (int i = 0, item_count = submenu_->GetMenuItemCount(); i < item_count;
+         ++i) {
+    submenu_->GetMenuItemAt(i)->DestroyAllMenuHosts();
+  }
+}
+
+// MenuController ------------------------------------------------------------
+
+// static
+MenuController* MenuController::active_instance_ = NULL;
+
+// static
+MenuController* MenuController::GetActiveInstance() {
+  return active_instance_;
+}
+
+#ifdef DEBUG_MENU
+static int instance_count = 0;
+static int nested_depth = 0;
+#endif
+
+MenuItemView* MenuController::Run(HWND parent,
+                                  MenuItemView* root,
+                                  const gfx::Rect& bounds,
+                                  MenuItemView::AnchorPosition position,
+                                  int* result_mouse_event_flags) {
+  exit_all_ = false;
+  possible_drag_ = false;
+
+  bool nested_menu = showing_;
+  if (showing_) {
+    // Only support nesting of blocking_run menus, nesting of
+    // blocking/non-blocking shouldn't be needed.
+    DCHECK(blocking_run_);
+
+    // We're already showing, push the current state.
+    menu_stack_.push_back(state_);
+
+    // The context menu should be owned by the same parent.
+    DCHECK(owner_ == parent);
+  } else {
+    showing_ = true;
+  }
+
+  // Reset current state.
+  pending_state_ = State();
+  state_ = State();
+  pending_state_.initial_bounds = bounds;
+  if (bounds.height() > 1) {
+    // Inset the bounds slightly, otherwise drag coordinates don't line up
+    // nicely and menus close prematurely.
+    pending_state_.initial_bounds.Inset(0, 1);
+  }
+  pending_state_.anchor = position;
+  owner_ = parent;
+
+  // Calculate the bounds of the monitor we'll show menus on. Do this once to
+  // avoid repeated system queries for the info.
+  POINT initial_loc = { bounds.x(), bounds.y() };
+  HMONITOR monitor = MonitorFromPoint(initial_loc, MONITOR_DEFAULTTONEAREST);
+  if (monitor) {
+    MONITORINFO mi = {0};
+    mi.cbSize = sizeof(mi);
+    GetMonitorInfo(monitor, &mi);
+    // Menus appear over the taskbar.
+    pending_state_.monitor_bounds = gfx::Rect(mi.rcMonitor);
+  }
+
+  did_capture_ = false;
+
+  any_menu_contains_mouse_ = false;
+
+  // Set the selection, which opens the initial menu.
+  SetSelection(root, true, true);
+
+  if (!blocking_run_) {
+    // Start the timer to hide the menu. This is needed as we get no
+    // notification when the drag has finished.
+    StartCancelAllTimer();
+    return NULL;
+  }
+
+#ifdef DEBUG_MENU
+  nested_depth++;
+  DLOG(INFO) << " entering nested loop, depth=" << nested_depth;
+#endif
+
+  MessageLoop::current()->Run(this);
+
+#ifdef DEBUG_MENU
+  nested_depth--;
+  DLOG(INFO) << " exiting nested loop,  depth=" << nested_depth;
+#endif
+
+  // Close any open menus.
+  SetSelection(NULL, false, true);
+
+  if (nested_menu) {
+    DCHECK(!menu_stack_.empty());
+    // We're running from within a menu, restore the previous state.
+    // The menus are already showing, so we don't have to show them.
+    state_ = menu_stack_.back();
+    pending_state_ = menu_stack_.back();
+    menu_stack_.pop_back();
+  } else {
+    showing_ = false;
+  }
+
+  MenuItemView* result = result_;
+  // In case we're nested, reset result_.
+  result_ = NULL;
+
+  if (result_mouse_event_flags)
+    *result_mouse_event_flags = result_mouse_event_flags_;
+
+  if (nested_menu && result) {
+    // We're nested and about to return a value. The caller might enter another
+    // blocking loop. We need to make sure all menus are hidden before that
+    // happens otherwise the menus will stay on screen.
+    CloseAllNestedMenus();
+
+    // Set exit_all_ to true, which makes sure all nested loops exit
+    // immediately.
+    exit_all_ = true;
+  }
+
+  return result;
+}
+
+void MenuController::SetSelection(MenuItemView* menu_item,
+                                  bool open_submenu,
+                                  bool update_immediately) {
+  size_t paths_differ_at = 0;
+  std::vector<MenuItemView*> current_path;
+  std::vector<MenuItemView*> new_path;
+  BuildPathsAndCalculateDiff(pending_state_.item, menu_item, &current_path,
+                             &new_path, &paths_differ_at);
+
+  size_t current_size = current_path.size();
+  size_t new_size = new_path.size();
+
+  // Notify the old path it isn't selected.
+  for (size_t i = paths_differ_at; i < current_size; ++i)
+    current_path[i]->SetSelected(false);
+
+  // Notify the new path it is selected.
+  for (size_t i = paths_differ_at; i < new_size; ++i)
+    new_path[i]->SetSelected(true);
+
+  pending_state_.item = menu_item;
+  pending_state_.submenu_open = open_submenu;
+
+  // Stop timers.
+  StopShowTimer();
+  StopCancelAllTimer();
+
+  if (update_immediately)
+    CommitPendingSelection();
+  else
+    StartShowTimer();
+}
+
+void MenuController::Cancel(bool all) {
+  if (!showing_) {
+    // This occurs if we're in the process of notifying the delegate for a drop
+    // and the delegate cancels us.
+    return;
+  }
+
+  MenuItemView* selected = state_.item;
+  exit_all_ = all;
+
+  // Hide windows immediately.
+  SetSelection(NULL, false, true);
+
+  if (!blocking_run_) {
+    // If we didn't block the caller we need to notify the menu, which
+    // triggers deleting us.
+    DCHECK(selected);
+    showing_ = false;
+    selected->GetRootMenuItem()->DropMenuClosed(true);
+    // WARNING: the call to MenuClosed deletes us.
+    return;
+  }
+}
+
+void MenuController::OnMousePressed(SubmenuView* source,
+                                    const MouseEvent& event) {
+#ifdef DEBUG_MENU
+  DLOG(INFO) << "OnMousePressed source=" << source;
+#endif
+  if (!blocking_run_)
+    return;
+
+  MenuPart part =
+      GetMenuPartByScreenCoordinate(source, event.GetX(), event.GetY());
+  if (part.is_scroll())
+    return;  // Ignore presses on scroll buttons.
+
+  if (part.type == MenuPart::NONE ||
+      (part.type == MenuPart::MENU_ITEM && part.menu &&
+       part.menu->GetRootMenuItem() != state_.item->GetRootMenuItem())) {
+    // Mouse wasn't pressed over any menu, or the active menu, cancel.
+
+    // We're going to close and we own the mouse capture. We need to repost the
+    // mouse down, otherwise the window the user clicked on won't get the
+    // event.
+    RepostEvent(source, event);
+
+    // And close.
+    Cancel(true);
+    return;
+  }
+
+  any_menu_contains_mouse_ = true;
+
+  bool open_submenu = false;
+  if (!part.menu) {
+    part.menu = source->GetMenuItem();
+    open_submenu = true;
+  } else {
+    if (part.menu->GetDelegate()->CanDrag(part.menu)) {
+      possible_drag_ = true;
+      press_x_ = event.GetX();
+      press_y_ = event.GetY();
+    }
+    if (part.menu->HasSubmenu())
+      open_submenu = true;
+  }
+  // On a press we immediately commit the selection, that way a submenu
+  // pops up immediately rather than after a delay.
+  SetSelection(part.menu, open_submenu, true);
+}
+
+void MenuController::OnMouseDragged(SubmenuView* source,
+                                    const MouseEvent& event) {
+#ifdef DEBUG_MENU
+  DLOG(INFO) << "OnMouseDragged source=" << source;
+#endif
+  MenuPart part =
+      GetMenuPartByScreenCoordinate(source, event.GetX(), event.GetY());
+  UpdateScrolling(part);
+
+  if (!blocking_run_)
+    return;
+
+  if (possible_drag_) {
+    if (ChromeViews::View::ExceededDragThreshold(event.GetX() - press_x_,
+                                                 event.GetY() - press_y_)) {
+      MenuItemView* item = state_.item;
+      DCHECK(item);
+      // Points are in the coordinates of the submenu, need to map to that of
+      // the selected item. Additionally source may not be the parent of
+      // the selected item, so need to map to screen first then to item.
+      CPoint press_loc(press_x_, press_y_);
+      View::ConvertPointToScreen(source->GetScrollViewContainer(), &press_loc);
+      View::ConvertPointToView(NULL, item, &press_loc);
+      CPoint drag_loc(event.GetX(), event.GetY());
+      View::ConvertPointToScreen(source->GetScrollViewContainer(), &drag_loc);
+      View::ConvertPointToView(NULL, item, &drag_loc);
+      in_drag_ = true;
+      ChromeCanvas canvas(item->GetWidth(), item->GetHeight(), false);
+      item->Paint(&canvas, true);
+
+      scoped_refptr<OSExchangeData> data(new OSExchangeData);
+      item->GetDelegate()->WriteDragData(item, data.get());
+      drag_utils::SetDragImageOnDataObject(canvas, item->GetWidth(),
+                                           item->GetHeight(), press_loc.x,
+                                           press_loc.y, data);
+
+      scoped_refptr<BaseDragSource> drag_source(new BaseDragSource);
+      int drag_ops = item->GetDelegate()->GetDragOperations(item);
+      DWORD effects;
+      StopScrolling();
+      DoDragDrop(data, drag_source,
+                 DragDropTypes::DragOperationToDropEffect(drag_ops),
+                 &effects);
+      if (GetActiveInstance() == this) {
+        if (showing_ ) {
+          // We're still showing, close all menus.
+          CloseAllNestedMenus();
+          Cancel(true);
+        } // else case, drop was on us.
+      } // else case, someone canceled us, don't do anything
+    }
+    return;
+  }
+  if (part.type == MenuPart::MENU_ITEM) {
+    if (!part.menu)
+      part.menu = source->GetMenuItem();
+    SetSelection(part.menu ? part.menu : state_.item, true, false);
+  }
+  any_menu_contains_mouse_ = (part.type == MenuPart::MENU_ITEM);
+}
+
+void MenuController::OnMouseReleased(SubmenuView* source,
+                                     const MouseEvent& event) {
+#ifdef DEBUG_MENU
+  DLOG(INFO) << "OnMouseReleased source=" << source;
+#endif
+  if (!blocking_run_)
+    return;
+
+  DCHECK(state_.item);
+  possible_drag_ = false;
+  DCHECK(blocking_run_);
+  MenuPart part =
+      GetMenuPartByScreenCoordinate(source, event.GetX(), event.GetY());
+  any_menu_contains_mouse_ = (part.type == MenuPart::MENU_ITEM);
+  if (event.IsRightMouseButton() && (part.type == MenuPart::MENU_ITEM &&
+                                     part.menu)) {
+    // Set the selection immediately, making sure the submenu is only open
+    // if it already was.
+    bool open_submenu = (state_.item == pending_state_.item &&
+                         state_.submenu_open);
+    SetSelection(pending_state_.item, open_submenu, true);
+    CPoint loc(event.GetX(), event.GetY());
+    View::ConvertPointToScreen(source->GetScrollViewContainer(), &loc);
+    part.menu->GetDelegate()->ShowContextMenu(
+        part.menu, part.menu->GetCommand(), loc.x, loc.y, true);
+  } else if (!part.is_scroll() && part.menu && !part.menu->HasSubmenu()) {
+    if (part.menu->GetDelegate()->IsTriggerableEvent(event)) {
+      Accept(part.menu, event.GetFlags());
+      return;
+    }
+  } else if (part.type == MenuPart::MENU_ITEM) {
+    // User either clicked on empty space, or a menu that has children.
+    SetSelection(part.menu ? part.menu : state_.item, true, true);
+  }
+}
+
+void MenuController::OnMouseMoved(SubmenuView* source,
+                                  const MouseEvent& event) {
+#ifdef DEBUG_MENU
+  DLOG(INFO) << "OnMouseMoved source=" << source;
+#endif
+  if (showing_submenu_)
+    return;
+
+  MenuPart part =
+      GetMenuPartByScreenCoordinate(source, event.GetX(), event.GetY());
+
+  UpdateScrolling(part);
+
+  if (!blocking_run_)
+    return;
+
+  any_menu_contains_mouse_ = (part.type == MenuPart::MENU_ITEM);
+  if (part.type == MenuPart::MENU_ITEM && part.menu) {
+    SetSelection(part.menu, true, false);
+  } else if (!part.is_scroll() && any_menu_contains_mouse_ &&
+             pending_state_.item &&
+             (!pending_state_.item->HasSubmenu() ||
+              !pending_state_.item->GetSubmenu()->IsShowing())) {
+    // On exit if the user hasn't selected an item with a submenu, move the
+    // selection back to the parent menu item.
+    SetSelection(pending_state_.item->GetParentMenuItem(), true, false);
+    any_menu_contains_mouse_ = false;
+  }
+}
+
+void MenuController::OnMouseEntered(SubmenuView* source,
+                                    const MouseEvent& event) {
+  // MouseEntered is always followed by a mouse moved, so don't need to
+  // do anything here.
+}
+
+bool MenuController::CanDrop(SubmenuView* source, const OSExchangeData& data) {
+  return source->GetMenuItem()->GetDelegate()->CanDrop(source->GetMenuItem(),
+                                                       data);
+}
+
+void MenuController::OnDragEntered(SubmenuView* source,
+                                   const DropTargetEvent& event) {
+  valid_drop_coordinates_ = false;
+}
+
+int MenuController::OnDragUpdated(SubmenuView* source,
+                                  const DropTargetEvent& event) {
+  StopCancelAllTimer();
+
+  CPoint screen_loc(event.GetX(), event.GetY());
+  View::ConvertPointToScreen(source, &screen_loc);
+  if (valid_drop_coordinates_ && screen_loc.x == drop_x_ &&
+      screen_loc.y == drop_y_) {
+    return last_drop_operation_;
+  }
+  drop_x_ = screen_loc.x;
+  drop_y_ = screen_loc.y;
+  valid_drop_coordinates_ = true;
+
+  MenuItemView* menu_item = GetMenuItemAt(source, event.GetX(), event.GetY());
+  bool over_empty_menu = false;
+  if (!menu_item) {
+    // See if we're over an empty menu.
+    menu_item = GetEmptyMenuItemAt(source, event.GetX(), event.GetY());
+    if (menu_item)
+      over_empty_menu = true;
+  }
+  MenuDelegate::DropPosition drop_position = MenuDelegate::DROP_NONE;
+  int drop_operation = DragDropTypes::DRAG_NONE;
+  if (menu_item) {
+    CPoint menu_item_loc(event.GetX(), event.GetY());
+    View::ConvertPointToView(source, menu_item, &menu_item_loc);
+    MenuItemView* query_menu_item;
+    if (!over_empty_menu) {
+      int menu_item_height = menu_item->GetHeight();
+      if (menu_item->HasSubmenu() &&
+          (menu_item_loc.y > MenuItemView::kDropBetweenPixels &&
+           menu_item_loc.y < (menu_item_height -
+                              MenuItemView::kDropBetweenPixels))) {
+        drop_position = MenuDelegate::DROP_ON;
+      } else if (menu_item_loc.y < menu_item_height / 2) {
+        drop_position = MenuDelegate::DROP_BEFORE;
+      } else {
+        drop_position = MenuDelegate::DROP_AFTER;
+      }
+      query_menu_item = menu_item;
+    } else {
+      query_menu_item = menu_item->GetParentMenuItem();
+      drop_position = MenuDelegate::DROP_ON;
+    }
+    drop_operation = menu_item->GetDelegate()->GetDropOperation(
+        query_menu_item, event, &drop_position);
+
+    if (menu_item->HasSubmenu()) {
+      // The menu has a submenu, schedule the submenu to open.
+      SetSelection(menu_item, true, false);
+    } else {
+      SetSelection(menu_item, false, false);
+    }
+
+    if (drop_position == MenuDelegate::DROP_NONE ||
+        drop_operation == DragDropTypes::DRAG_NONE) {
+      menu_item = NULL;
+    }
+  } else {
+    SetSelection(source->GetMenuItem(), true, false);
+  }
+  SetDropMenuItem(menu_item, drop_position);
+  last_drop_operation_ = drop_operation;
+  return drop_operation;
+}
+
+void MenuController::OnDragExited(SubmenuView* source) {
+  StartCancelAllTimer();
+
+  if (drop_target_) {
+    StopShowTimer();
+    SetDropMenuItem(NULL, MenuDelegate::DROP_NONE);
+  }
+}
+
+int MenuController::OnPerformDrop(SubmenuView* source,
+                                  const DropTargetEvent& event) {
+  DCHECK(drop_target_);
+  // NOTE: the delegate may delete us after invoking OnPerformDrop, as such
+  // we don't call cancel here.
+
+  MenuItemView* item = state_.item;
+  DCHECK(item);
+
+  MenuItemView* drop_target = drop_target_;
+  MenuDelegate::DropPosition drop_position = drop_position_;
+
+  // Close all menus, including any nested menus.
+  SetSelection(NULL, false, true);
+  CloseAllNestedMenus();
+
+  // Set state such that we exit.
+  showing_ = false;
+  exit_all_ = true;
+
+  if (!IsBlockingRun())
+    item->GetRootMenuItem()->DropMenuClosed(false);
+
+  // WARNING: the call to MenuClosed deletes us.
+
+  // If over an empty menu item, drop occurs on the parent.
+  if (drop_target->GetID() == EmptyMenuMenuItem::kEmptyMenuItemViewID)
+    drop_target = drop_target->GetParentMenuItem();
+
+  return drop_target->GetDelegate()->OnPerformDrop(
+      drop_target, drop_position, event);
+}
+
+void MenuController::OnDragEnteredScrollButton(SubmenuView* source,
+                                               bool is_up) {
+  MenuPart part;
+  part.type = is_up ? MenuPart::SCROLL_UP : MenuPart::SCROLL_DOWN;
+  part.submenu = source;
+  UpdateScrolling(part);
+
+  // Do this to force the selection to hide.
+  SetDropMenuItem(source->GetMenuItemAt(0), MenuDelegate::DROP_NONE);
+
+  StopCancelAllTimer();
+}
+
+void MenuController::OnDragExitedScrollButton(SubmenuView* source) {
+  StartCancelAllTimer();
+  SetDropMenuItem(NULL, MenuDelegate::DROP_NONE);
+  StopScrolling();
+}
+
+// static
+void MenuController::SetActiveInstance(MenuController* controller) {
+  active_instance_ = controller;
+}
+
+bool MenuController::Dispatch(const MSG& msg) {
+  DCHECK(blocking_run_);
+
+  if (exit_all_)
+    return false;
+
+  // NOTE: we don't get WM_ACTIVATE or anything else interesting in here.
+  switch (msg.message) {
+    // NOTE: focus wasn't changed when the menu was shown. As such, don't
+    // dispatch key events otherwise the focused window will get the events.
+    case WM_KEYDOWN:
+      return OnKeyDown(msg);
+
+    case WM_CHAR:
+      return OnChar(msg);
+
+    case WM_KEYUP:
+      return true;
+
+    case WM_CANCELMODE:
+    case WM_SYSKEYDOWN:
+    case WM_SYSKEYUP:
+      // Exit immediately on system keys.
+      Cancel(true);
+      return false;
+
+    default:
+      break;
+  }
+  TranslateMessage(&msg);
+  DispatchMessage(&msg);
+  return !exit_all_;
+}
+
+bool MenuController::OnKeyDown(const MSG& msg) {
+  DCHECK(blocking_run_);
+
+  switch (msg.wParam) {
+    case VK_UP:
+      IncrementSelection(-1);
+      break;
+
+    case VK_DOWN:
+      IncrementSelection(1);
+      break;
+
+    // Handling of VK_RIGHT and VK_LEFT is different depending on the UI
+    // layout.
+    case VK_RIGHT:
+      if (l10n_util::TextDirection() == l10n_util::RIGHT_TO_LEFT)
+        CloseSubmenu();
+      else
+        OpenSubmenuChangeSelectionIfCan();
+      break;
+
+    case VK_LEFT:
+      if (l10n_util::TextDirection() == l10n_util::RIGHT_TO_LEFT)
+        OpenSubmenuChangeSelectionIfCan();
+      else
+        CloseSubmenu();
+      break;
+
+    case VK_RETURN:
+      if (pending_state_.item) {
+        if (pending_state_.item->HasSubmenu()) {
+          OpenSubmenuChangeSelectionIfCan();
+        } else if (pending_state_.item->IsEnabled()) {
+          Accept(pending_state_.item, 0);
+          return false;
+        }
+      }
+      break;
+
+    case VK_ESCAPE:
+      if (!state_.item->GetParentMenuItem() ||
+          (!state_.item->GetParentMenuItem()->GetParentMenuItem() &&
+           (!state_.item->HasSubmenu() ||
+            !state_.item->GetSubmenu()->IsShowing()))) {
+        // User pressed escape and only one menu is shown, cancel it.
+        Cancel(false);
+        return false;
+      } else {
+        CloseSubmenu();
+      }
+      break;
+
+    default:
+      TranslateMessage(&msg);
+      break;
+  }
+  return true;
+}
+
+bool MenuController::OnChar(const MSG& msg) {
+  DCHECK(blocking_run_);
+
+  return !SelectByChar(static_cast<wchar_t>(msg.wParam));
+}
+
+MenuController::MenuController(bool blocking)
+    : blocking_run_(blocking),
+      showing_(false),
+      exit_all_(false),
+      did_capture_(false),
+#pragma warning(suppress: 4355)  // Okay to pass "this" here.
+      show_task_(this),
+      result_(NULL),
+      show_timer_(NULL),
+#pragma warning(suppress: 4355)  // Okay to pass "this" here.
+      cancel_all_task_(this),
+      cancel_all_timer_(NULL),
+      drop_target_(NULL),
+      owner_(NULL),
+      possible_drag_(false),
+      valid_drop_coordinates_(false),
+      in_drag_(false),
+      any_menu_contains_mouse_(false),
+      showing_submenu_(false),
+      result_mouse_event_flags_(0) {
+#ifdef DEBUG_MENU
+  instance_count++;
+  DLOG(INFO) << "created MC, count=" << instance_count;
+#endif
+}
+
+MenuController::~MenuController() {
+  DCHECK(!showing_);
+  StopShowTimer();
+  StopCancelAllTimer();
+#ifdef DEBUG_MENU
+  instance_count--;
+  DLOG(INFO) << "destroyed MC, count=" << instance_count;
+#endif
+}
+
+void MenuController::Accept(MenuItemView* item, int mouse_event_flags) {
+  DCHECK(IsBlockingRun());
+  result_ = item;
+  exit_all_ = true;
+  result_mouse_event_flags_ = mouse_event_flags;
+}
+
+void MenuController::CloseAllNestedMenus() {
+  for (std::list<State>::iterator i = menu_stack_.begin();
+       i != menu_stack_.end(); ++i) {
+    MenuItemView* item = i->item;
+    MenuItemView* last_item = item;
+    while (item) {
+      CloseMenu(item);
+      last_item = item;
+      item = item->GetParentMenuItem();
+    }
+    i->submenu_open = false;
+    i->item = last_item;
+  }
+}
+
+MenuItemView* MenuController::GetMenuItemAt(View* source, int x, int y) {
+  View* child_under_mouse = source->GetViewForPoint(CPoint(x, y));
+  if (child_under_mouse && child_under_mouse->IsEnabled() &&
+      child_under_mouse->GetID() == MenuItemView::kMenuItemViewID) {
+    return static_cast<MenuItemView*>(child_under_mouse);
+  }
+  return NULL;
+}
+
+MenuItemView* MenuController::GetEmptyMenuItemAt(View* source, int x, int y) {
+  View* child_under_mouse = source->GetViewForPoint(CPoint(x, y));
+  if (child_under_mouse &&
+      child_under_mouse->GetID() == EmptyMenuMenuItem::kEmptyMenuItemViewID) {
+    return static_cast<MenuItemView*>(child_under_mouse);
+  }
+  return NULL;
+}
+
+bool MenuController::IsScrollButtonAt(SubmenuView* source,
+                                      int x,
+                                      int y,
+                                      MenuPart::Type* part) {
+  MenuScrollViewContainer* scroll_view = source->GetScrollViewContainer();
+  View* child_under_mouse = scroll_view->GetViewForPoint(CPoint(x, y));
+  if (child_under_mouse && child_under_mouse->IsEnabled()) {
+    if (child_under_mouse == scroll_view->scroll_up_button()) {
+      *part = MenuPart::SCROLL_UP;
+      return true;
+    }
+    if (child_under_mouse == scroll_view->scroll_down_button()) {
+      *part = MenuPart::SCROLL_DOWN;
+      return true;
+    }
+  }
+  return false;
+}
+
+MenuController::MenuPart MenuController::GetMenuPartByScreenCoordinate(
+    SubmenuView* source,
+    int source_x,
+    int source_y) {
+  MenuPart part;
+
+  CPoint screen_loc(source_x, source_y);
+  View::ConvertPointToScreen(source->GetScrollViewContainer(), &screen_loc);
+
+  MenuItemView* item = state_.item;
+  while (item) {
+    if (item->HasSubmenu() && item->GetSubmenu()->IsShowing() &&
+        GetMenuPartByScreenCoordinateImpl(item->GetSubmenu(), screen_loc,
+                                          &part)) {
+      return part;
+    }
+    item = item->GetParentMenuItem();
+  }
+
+  return part;
+}
+
+bool MenuController::GetMenuPartByScreenCoordinateImpl(
+    SubmenuView* menu,
+    const CPoint& screen_loc,
+    MenuPart* part) {
+  // Is the mouse over the scroll buttons?
+  CPoint scroll_view_loc = screen_loc;
+  View* scroll_view_container = menu->GetScrollViewContainer();
+  View::ConvertPointToView(NULL, scroll_view_container, &scroll_view_loc);
+  if (scroll_view_loc.x < 0 ||
+      scroll_view_loc.x >= scroll_view_container->GetWidth() ||
+      scroll_view_loc.y < 0 ||
+      scroll_view_loc.y >= scroll_view_container->GetHeight()) {
+    // Point isn't contained in menu.
+    return false;
+  }
+  if (IsScrollButtonAt(menu, scroll_view_loc.x, scroll_view_loc.y,
+                       &(part->type))) {
+    part->submenu = menu;
+    return true;
+  }
+
+  // Not over the scroll button. Check the actual menu.
+  if (DoesSubmenuContainLocation(menu, screen_loc)) {
+    CPoint menu_loc = screen_loc;
+    View::ConvertPointToView(NULL, menu, &menu_loc);
+    part->menu = GetMenuItemAt(menu, menu_loc.x, menu_loc.y);
+    part->type = MenuPart::MENU_ITEM;
+    return true;
+  }
+
+  // While the mouse isn't over a menu item or the scroll buttons of menu, it
+  // is contained by menu and so we return true. If we didn't return true other
+  // menus would be searched, even though they are likely obscured by us.
+  return true;
+}
+
+bool MenuController::DoesSubmenuContainLocation(SubmenuView* submenu,
+                                                const CPoint& screen_loc) {
+  CPoint view_loc = screen_loc;
+  View::ConvertPointToView(NULL, submenu, &view_loc);
+  gfx::Rect vis_rect = submenu->GetVisibleBounds();
+  return vis_rect.Contains(view_loc.x, view_loc.y);
+}
+
+void MenuController::CommitPendingSelection() {
+  StopShowTimer();
+
+  size_t paths_differ_at = 0;
+  std::vector<MenuItemView*> current_path;
+  std::vector<MenuItemView*> new_path;
+  BuildPathsAndCalculateDiff(state_.item, pending_state_.item, &current_path,
+                             &new_path, &paths_differ_at);
+
+  // Hide the old menu.
+  for (size_t i = paths_differ_at; i < current_path.size(); ++i) {
+    if (current_path[i]->HasSubmenu()) {
+      // See description of in_drag_ as to why close is conditionalized like
+      // this.
+      current_path[i]->GetSubmenu()->Close(!in_drag_);
+    }
+  }
+
+  // Copy pending to state_, making sure to preserve the direction menus were
+  // opened.
+  std::list<bool> pending_open_direction;
+  state_.open_leading.swap(pending_open_direction);
+  state_ = pending_state_;
+  state_.open_leading.swap(pending_open_direction);
+
+  int menu_depth = MenuDepth(state_.item);
+  if (menu_depth == 0) {
+    state_.open_leading.clear();
+  } else {
+    int cached_size = static_cast<int>(state_.open_leading.size());
+    DCHECK(menu_depth >= 0);
+    while (cached_size-- >= menu_depth)
+      state_.open_leading.pop_back();
+  }
+
+  if (!state_.item) {
+    // Nothing to select.
+    StopScrolling();
+    return;
+  }
+
+  // Open all the submenus preceeding the last menu item (last menu item is
+  // handled next).
+  if (new_path.size() > 1) {
+    for (std::vector<MenuItemView*>::iterator i = new_path.begin();
+         i != new_path.end() - 1; ++i) {
+      OpenMenu(*i);
+    }
+  }
+
+  if (state_.submenu_open) {
+    // The submenu should be open, open the submenu if the item has a submenu.
+    if (state_.item->HasSubmenu()) {
+      OpenMenu(state_.item);
+    } else {
+      state_.submenu_open = false;
+    }
+  } else if (state_.item->HasSubmenu() &&
+             state_.item->GetSubmenu()->IsShowing()) {
+    // The submenu is showing, but it shouldn't be, close it.
+    // See description of in_drag_ as to why close is conditionalized like
+    // this.
+    state_.item->GetSubmenu()->Close(!in_drag_);
+  }
+
+  if (scroll_task_.get() && scroll_task_->submenu()) {
+    // Stop the scrolling if none of the elements of the selection contain
+    // the menu being scrolled.
+    bool found = false;
+    MenuItemView* item = state_.item;
+    while (item && !found) {
+      found = (item->HasSubmenu() && item->GetSubmenu()->IsShowing() &&
+               item->GetSubmenu() == scroll_task_->submenu());
+      item = item->GetParentMenuItem();
+    }
+    if (!found)
+      StopScrolling();
+  }
+}
+
+void MenuController::CloseMenu(MenuItemView* item) {
+  DCHECK(item);
+  if (!item->HasSubmenu())
+    return;
+  // See description of in_drag_ as to why close is conditionalized like this.
+  item->GetSubmenu()->Close(!in_drag_);
+}
+
+void MenuController::OpenMenu(MenuItemView* item) {
+  DCHECK(item);
+  if (item->GetSubmenu()->IsShowing()) {
+    return;
+  }
+
+  bool prefer_leading =
+      state_.open_leading.empty() ? true : state_.open_leading.back();
+  bool resulting_direction;
+  gfx::Rect bounds =
+      CalculateMenuBounds(item, prefer_leading, &resulting_direction);
+  state_.open_leading.push_back(resulting_direction);
+  bool do_capture = (!did_capture_ && blocking_run_);
+  showing_submenu_ = true;
+  item->GetSubmenu()->ShowAt(owner_, bounds, do_capture);
+  showing_submenu_ = false;
+  did_capture_ = true;
+}
+
+void MenuController::BuildPathsAndCalculateDiff(
+    MenuItemView* old_item,
+    MenuItemView* new_item,
+    std::vector<MenuItemView*>* old_path,
+    std::vector<MenuItemView*>* new_path,
+    size_t* first_diff_at) {
+  DCHECK(old_path && new_path && first_diff_at);
+  BuildMenuItemPath(old_item, old_path);
+  BuildMenuItemPath(new_item, new_path);
+
+  size_t common_size = std::min(old_path->size(), new_path->size());
+
+  // Find the first difference between the two paths, when the loop
+  // returns, diff_i is the first index where the two paths differ.
+  for (size_t i = 0; i < common_size; ++i) {
+    if ((*old_path)[i] != (*new_path)[i]) {
+      *first_diff_at = i;
+      return;
+    }
+  }
+
+  *first_diff_at = common_size;
+}
+
+void MenuController::BuildMenuItemPath(MenuItemView* item,
+                                       std::vector<MenuItemView*>* path) {
+  if (!item)
+    return;
+  BuildMenuItemPath(item->GetParentMenuItem(), path);
+  path->push_back(item);
+}
+
+void MenuController::StartShowTimer() {
+  StopShowTimer();
+  show_timer_ = MessageLoop::current()->timer_manager()->
+      StartTimer(kShowDelay, &show_task_, false);
+}
+
+void MenuController::StopShowTimer() {
+  if (show_timer_) {
+    MessageLoop::current()->timer_manager()->StopTimer(show_timer_);
+    delete show_timer_;
+    show_timer_ = NULL;
+  }
+}
+
+void MenuController::StartCancelAllTimer() {
+  StopCancelAllTimer();
+  cancel_all_timer_ = MessageLoop::current()->timer_manager()->
+      StartTimer(kCloseOnExitTime, &cancel_all_task_, false);
+}
+
+void MenuController::StopCancelAllTimer() {
+  if (cancel_all_timer_) {
+    MessageLoop::current()->timer_manager()->StopTimer(cancel_all_timer_);
+    delete cancel_all_timer_;
+    cancel_all_timer_ = NULL;
+  }
+}
+
+gfx::Rect MenuController::CalculateMenuBounds(MenuItemView* item,
+                                              bool prefer_leading,
+                                              bool* is_leading) {
+  DCHECK(item);
+
+  SubmenuView* submenu = item->GetSubmenu();
+  DCHECK(submenu);
+
+  CSize pref;
+  submenu->GetScrollViewContainer()->GetPreferredSize(&pref);
+
+  // Don't let the menu go to wide. This is some where between what IE and FF
+  // do.
+  pref.cx = std::min(pref.cx, kMaxMenuWidth);
+  if (!state_.monitor_bounds.IsEmpty())
+    pref.cx = std::min(pref.cx,
+                       static_cast<LONG>(state_.monitor_bounds.width()));
+
+  // Assume we can honor prefer_leading.
+  *is_leading = prefer_leading;
+
+  int x, y;
+
+  if (!item->GetParentMenuItem()) {
+    // First item, position relative to initial location.
+    x = state_.initial_bounds.x();
+    y = state_.initial_bounds.bottom();
+    if (state_.anchor == MenuItemView::TOPRIGHT)
+      x = x + state_.initial_bounds.width() - pref.cx;
+    if (!state_.monitor_bounds.IsEmpty() &&
+        y + pref.cy > state_.monitor_bounds.bottom()) {
+      // The menu doesn't fit on screen. If the first location is above the
+      // half way point, show from the mouse location to bottom of screen.
+      // Otherwise show from the top of the screen to the location of the mouse.
+      // While odd, this behavior matches IE.
+      if (y < (state_.monitor_bounds.y() +
+               state_.monitor_bounds.height() / 2)) {
+        pref.cy = std::min(pref.cy,
+            static_cast<LONG>(state_.monitor_bounds.bottom() - y));
+      } else {
+        pref.cy = std::min(pref.cy, static_cast<LONG>(
+            state_.initial_bounds.y() - state_.monitor_bounds.y()));
+        y = state_.initial_bounds.y() - pref.cy;
+      }
+    }
+  } else {
+    // Not the first menu; position it relative to the bounds of the menu
+    // item.
+    CPoint item_loc(0, 0);
+    View::ConvertPointToScreen(item, &item_loc);
+
+    // We must make sure we take into account the UI layout. If the layout is
+    // RTL, then a 'leading' menu is positioned to the left of the parent menu
+    // item and not to the right.
+    bool layout_is_rtl = item->UILayoutIsRightToLeft();
+    bool create_on_the_right = (prefer_leading && !layout_is_rtl) ||
+                               (!prefer_leading && layout_is_rtl);
+
+    if (create_on_the_right) {
+      x = item_loc.x + item->GetWidth() - kSubmenuHorizontalInset;
+      if (state_.monitor_bounds.width() != 0 &&
+          x + pref.cx > state_.monitor_bounds.right()) {
+        if (layout_is_rtl)
+          *is_leading = true;
+        else
+          *is_leading = false;
+        x = item_loc.x - pref.cx + kSubmenuHorizontalInset;
+      }
+    } else {
+      x = item_loc.x - pref.cx + kSubmenuHorizontalInset;
+      if (state_.monitor_bounds.width() != 0 && x < state_.monitor_bounds.x()) {
+        if (layout_is_rtl)
+          *is_leading = false;
+        else
+          *is_leading = true;
+        x = item_loc.x + item->GetWidth() - kSubmenuHorizontalInset;
+      }
+    }
+    y = item_loc.y - kSubmenuBorderSize;
+    if (state_.monitor_bounds.width() != 0) {
+      pref.cy = std::min(pref.cy,
+                         static_cast<LONG>(state_.monitor_bounds.height()));
+      if (y + pref.cy > state_.monitor_bounds.bottom())
+        y = state_.monitor_bounds.bottom() - pref.cy;
+      if (y < state_.monitor_bounds.y())
+        y = state_.monitor_bounds.y();
+    }
+  }
+
+  if (state_.monitor_bounds.width() != 0) {
+    if (x + pref.cx > state_.monitor_bounds.right())
+      x = state_.monitor_bounds.right() - pref.cx;
+    if (x < state_.monitor_bounds.x())
+      x = state_.monitor_bounds.x();
+  }
+  return gfx::Rect(x, y, pref.cx, pref.cy);
+}
+
+// static
+int MenuController::MenuDepth(MenuItemView* item) {
+  if (!item)
+    return 0;
+  return MenuDepth(item->GetParentMenuItem()) + 1;
+}
+
+void MenuController::IncrementSelection(int delta) {
+  MenuItemView* item = pending_state_.item;
+  DCHECK(item);
+  if (pending_state_.submenu_open && item->HasSubmenu() &&
+      item->GetSubmenu()->IsShowing()) {
+    // A menu is selected and open, but none of its children are selected,
+    // select the first menu item.
+    if (item->GetSubmenu()->GetMenuItemCount()) {
+      SetSelection(item->GetSubmenu()->GetMenuItemAt(0), false, false);
+      ScrollToVisible(item->GetSubmenu()->GetMenuItemAt(0));
+      return; // return so else case can fall through.
+    }
+  }
+  if (item->GetParentMenuItem()) {
+    MenuItemView* parent = item->GetParentMenuItem();
+    int parent_count = parent->GetSubmenu()->GetMenuItemCount();
+    if (parent_count > 1) {
+      for (int i = 0; i < parent_count; ++i) {
+        if (parent->GetSubmenu()->GetMenuItemAt(i) == item) {
+          int next_index = (i + delta + parent_count) % parent_count;
+          ScrollToVisible(parent->GetSubmenu()->GetMenuItemAt(next_index));
+          SetSelection(parent->GetSubmenu()->GetMenuItemAt(next_index), false,
+                       false);
+          break;
+        }
+      }
+    }
+  }
+}
+
+void MenuController::OpenSubmenuChangeSelectionIfCan() {
+  MenuItemView* item = pending_state_.item;
+  if (item->HasSubmenu()) {
+    if (item->GetSubmenu()->GetMenuItemCount() > 0) {
+      SetSelection(item->GetSubmenu()->GetMenuItemAt(0), false, true);
+    } else {
+      // No menu items, just show the sub-menu.
+      SetSelection(item, true, true);
+    }
+  }
+}
+
+void MenuController::CloseSubmenu() {
+  MenuItemView* item = state_.item;
+  DCHECK(item);
+  if (!item->GetParentMenuItem())
+    return;
+  if (item->HasSubmenu() && item->GetSubmenu()->IsShowing()) {
+    SetSelection(item, false, true);
+  } else if (item->GetParentMenuItem()->GetParentMenuItem()) {
+    SetSelection(item->GetParentMenuItem(), false, true);
+  }
+}
+
+bool MenuController::IsMenuWindow(MenuItemView* item, HWND window) {
+  if (!item)
+    return false;
+  return ((item->HasSubmenu() && item->GetSubmenu()->IsShowing() &&
+           item->GetSubmenu()->GetViewContainer()->GetHWND() == window) ||
+           IsMenuWindow(item->GetParentMenuItem(), window));
+}
+
+bool MenuController::SelectByChar(wchar_t character) {
+  wchar_t char_array[1] = { character };
+  wchar_t key = l10n_util::ToLower(char_array)[0];
+  MenuItemView* item = pending_state_.item;
+  if (!item->HasSubmenu() || !item->GetSubmenu()->IsShowing())
+    item = item->GetParentMenuItem();
+  DCHECK(item);
+  DCHECK(item->HasSubmenu());
+  SubmenuView* submenu = item->GetSubmenu();
+  DCHECK(submenu);
+  int menu_item_count = submenu->GetMenuItemCount();
+  if (!menu_item_count)
+    return false;
+  for (int i = 0; i < menu_item_count; ++i) {
+    MenuItemView* child = submenu->GetMenuItemAt(i);
+    if (child->GetMnemonic() == key && child->IsEnabled()) {
+      Accept(child, 0);
+      return true;
+    }
+  }
+
+  // No matching mnemonic, search through items that don't have mnemonic
+  // based on first character of the title.
+  int first_match = -1;
+  bool has_multiple = false;
+  int next_match = -1;
+  int index_of_item = -1;
+  for (int i = 0; i < menu_item_count; ++i) {
+    MenuItemView* child = submenu->GetMenuItemAt(i);
+    if (!child->GetMnemonic() && child->IsEnabled()) {
+      std::wstring lower_title = l10n_util::ToLower(child->GetTitle());
+      if (child == pending_state_.item)
+        index_of_item = i;
+      if (lower_title.length() && lower_title[0] == key) {
+        if (first_match == -1)
+          first_match = i;
+        else
+          has_multiple = true;
+        if (next_match == -1 && index_of_item != -1 && i > index_of_item)
+          next_match = i;
+      }
+    }
+  }
+  if (first_match != -1) {
+    if (!has_multiple) {
+      if (submenu->GetMenuItemAt(first_match)->HasSubmenu()) {
+        SetSelection(submenu->GetMenuItemAt(first_match), true, false);
+      } else {
+        Accept(submenu->GetMenuItemAt(first_match), 0);
+        return true;
+      }
+    } else if (index_of_item == -1 || next_match == -1) {
+      SetSelection(submenu->GetMenuItemAt(first_match), false, false);
+    } else {
+      SetSelection(submenu->GetMenuItemAt(next_match), false, false);
+    }
+  }
+  return false;
+}
+
+void MenuController::RepostEvent(SubmenuView* source,
+                                 const MouseEvent& event) {
+  CPoint screen_loc(event.GetX(), event.GetY());
+  View::ConvertPointToScreen(source->GetScrollViewContainer(), &screen_loc);
+  HWND window = WindowFromPoint(screen_loc);
+  if (window) {
+#ifdef DEBUG_MENU
+    DLOG(INFO) << "RepostEvent on press";
+#endif
+
+    // Release the capture.
+    SubmenuView* submenu = state_.item->GetRootMenuItem()->GetSubmenu();
+    submenu->ReleaseCapture();
+
+    if (submenu->host() && submenu->host()->GetHWND() &&
+        GetWindowThreadProcessId(submenu->host()->GetHWND(), NULL) !=
+        GetWindowThreadProcessId(window, NULL)) {
+      // Even though we have mouse capture, windows generates a mouse event
+      // if the other window is in a separate thread. Don't generate an event in
+      // this case else the target window can get double events leading to bad
+      // behavior.
+      return;
+    }
+
+    // Convert the coordinates to the target window.
+    RECT window_bounds;
+    GetWindowRect(window, &window_bounds);
+    int window_x = screen_loc.x - window_bounds.left;
+    int window_y = screen_loc.y - window_bounds.top;
+
+    // Determine whether the click was in the client area or not.
+    // NOTE: WM_NCHITTEST coordinates are relative to the screen.
+    LRESULT nc_hit_result = SendMessage(window, WM_NCHITTEST, 0,
+                                        MAKELPARAM(screen_loc.x, screen_loc.y));
+    const bool in_client_area = (nc_hit_result == HTCLIENT);
+
+    // TODO(sky): this isn't right. The event to generate should correspond
+    // with the event we just got. MouseEvent only tells us what is down,
+    // which may differ. Need to add ability to get changed button from
+    // MouseEvent.
+    int event_type;
+    if (event.IsLeftMouseButton())
+      event_type = in_client_area ? WM_LBUTTONDOWN : WM_NCLBUTTONDOWN;
+    else if (event.IsMiddleMouseButton())
+      event_type = in_client_area ? WM_MBUTTONDOWN : WM_NCMBUTTONDOWN;
+    else if (event.IsRightMouseButton())
+      event_type = in_client_area ? WM_RBUTTONDOWN : WM_NCRBUTTONDOWN;
+    else
+      event_type = 0;  // Unknown mouse press.
+
+    if (event_type) {
+      if (in_client_area) {
+        PostMessage(window, event_type, event.GetWindowsFlags(),
+                    MAKELPARAM(window_x, window_y));
+      } else {
+        PostMessage(window, WM_NCLBUTTONDOWN, nc_hit_result,
+                    MAKELPARAM(window_x, window_y));
+      }
+    }
+  }
+}
+
+void MenuController::SetDropMenuItem(
+    MenuItemView* new_target,
+    MenuDelegate::DropPosition new_position) {
+  if (new_target == drop_target_ && new_position == drop_position_)
+    return;
+
+  if (drop_target_) {
+    drop_target_->GetParentMenuItem()->GetSubmenu()->SetDropMenuItem(
+        NULL, MenuDelegate::DROP_NONE);
+  }
+  drop_target_ = new_target;
+  drop_position_ = new_position;
+  if (drop_target_) {
+    drop_target_->GetParentMenuItem()->GetSubmenu()->SetDropMenuItem(
+        drop_target_, drop_position_);
+  }
+}
+
+void MenuController::UpdateScrolling(const MenuPart& part) {
+  if (!part.is_scroll() && !scroll_task_.get())
+    return;
+
+  if (!scroll_task_.get())
+    scroll_task_.reset(new MenuScrollTask());
+  scroll_task_->Update(part);
+}
+
+void MenuController::StopScrolling() {
+  scroll_task_.reset(NULL);
+}
+
+}  // namespace ChromeViews