1 files changed, 192 insertions, 0 deletions
diff --git a/views/controls/button/button_dropdown.cc b/views/controls/button/button_dropdown.cc
new file mode 100644
index 0000000..270894b
--- /dev/null
+++ b/views/controls/button/button_dropdown.cc
@@ -0,0 +1,192 @@
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "views/controls/button/button_dropdown.h"
+
+#include "app/l10n_util.h"
+#include "base/message_loop.h"
+#include "grit/generated_resources.h"
+#include "views/controls/menu/view_menu_delegate.h"
+#include "views/widget/widget.h"
+
+namespace views {
+
+// How long to wait before showing the menu
+static const int kMenuTimerDelay = 500;
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// ButtonDropDown - constructors, destructors, initialization, cleanup
+//
+////////////////////////////////////////////////////////////////////////////////
+
+ButtonDropDown::ButtonDropDown(ButtonListener* listener,
+                               Menu::Delegate* menu_delegate)
+    : ImageButton(listener),
+      menu_delegate_(menu_delegate),
+      y_position_on_lbuttondown_(0),
+      show_menu_factory_(this) {
+}
+
+ButtonDropDown::~ButtonDropDown() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// ButtonDropDown - Events
+//
+////////////////////////////////////////////////////////////////////////////////
+
+bool ButtonDropDown::OnMousePressed(const MouseEvent& e) {
+  if (IsEnabled() && e.IsLeftMouseButton() && HitTest(e.location())) {
+    // Store the y pos of the mouse coordinates so we can use them later to
+    // determine if the user dragged the mouse down (which should pop up the
+    // drag down menu immediately, instead of waiting for the timer)
+    y_position_on_lbuttondown_ = e.y();
+
+    // Schedule a task that will show the menu.
+    MessageLoop::current()->PostDelayedTask(FROM_HERE,
+        show_menu_factory_.NewRunnableMethod(&ButtonDropDown::ShowDropDownMenu,
+                                             GetWidget()->GetNativeView()),
+        kMenuTimerDelay);
+  }
+
+  return ImageButton::OnMousePressed(e);
+}
+
+void ButtonDropDown::OnMouseReleased(const MouseEvent& e, bool canceled) {
+  ImageButton::OnMouseReleased(e, canceled);
+
+  if (canceled)
+    return;
+
+  if (e.IsLeftMouseButton())
+    show_menu_factory_.RevokeAll();
+
+  if (IsEnabled() && e.IsRightMouseButton() && HitTest(e.location())) {
+    show_menu_factory_.RevokeAll();
+    // Make the button look depressed while the menu is open.
+    // NOTE: SetState() schedules a paint, but it won't occur until after the
+    //       context menu message loop has terminated, so we PaintNow() to
+    //       update the appearance synchronously.
+    SetState(BS_PUSHED);
+    PaintNow();
+    ShowDropDownMenu(GetWidget()->GetNativeView());
+  }
+}
+
+bool ButtonDropDown::OnMouseDragged(const MouseEvent& e) {
+  bool result = ImageButton::OnMouseDragged(e);
+
+  if (!show_menu_factory_.empty()) {
+    // SM_CYDRAG is a pixel value for minimum dragging distance before operation
+    // counts as a drag, and not just as a click and accidental move of a mouse.
+    // See http://msdn2.microsoft.com/en-us/library/ms724385.aspx for details.
+    int dragging_threshold = GetSystemMetrics(SM_CYDRAG);
+
+    // If the mouse is dragged to a y position lower than where it was when
+    // clicked then we should not wait for the menu to appear but show
+    // it immediately.
+    if (e.y() > y_position_on_lbuttondown_ + dragging_threshold) {
+      show_menu_factory_.RevokeAll();
+      ShowDropDownMenu(GetWidget()->GetNativeView());
+    }
+  }
+
+  return result;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// ButtonDropDown - Menu functions
+//
+////////////////////////////////////////////////////////////////////////////////
+
+void ButtonDropDown::ShowContextMenu(int x, int y, bool is_mouse_gesture) {
+  show_menu_factory_.RevokeAll();
+  // Make the button look depressed while the menu is open.
+  // NOTE: SetState() schedules a paint, but it won't occur until after the
+  //       context menu message loop has terminated, so we PaintNow() to
+  //       update the appearance synchronously.
+  SetState(BS_PUSHED);
+  PaintNow();
+  ShowDropDownMenu(GetWidget()->GetNativeView());
+  SetState(BS_HOT);
+}
+
+void ButtonDropDown::ShowDropDownMenu(HWND window) {
+  if (menu_delegate_) {
+    gfx::Rect lb = GetLocalBounds(true);
+
+    // Both the menu position and the menu anchor type change if the UI layout
+    // is right-to-left.
+    gfx::Point menu_position(lb.origin());
+    menu_position.Offset(0, lb.height() - 1);
+    if (UILayoutIsRightToLeft())
+      menu_position.Offset(lb.width() - 1, 0);
+
+    Menu::AnchorPoint anchor = Menu::TOPLEFT;
+    if (UILayoutIsRightToLeft())
+      anchor = Menu::TOPRIGHT;
+
+    View::ConvertPointToScreen(this, &menu_position);
+
+    int left_bound = GetSystemMetrics(SM_XVIRTUALSCREEN);
+    if (menu_position.x() < left_bound)
+      menu_position.set_x(left_bound);
+
+    Menu menu(menu_delegate_, anchor, window);
+
+    // ID's for AppendMenu is 1-based because RunMenu will ignore the user
+    // selection if id=0 is selected (0 = NO-OP) so we add 1 here and subtract 1
+    // in the handlers above to get the actual index
+    int item_count = menu_delegate_->GetItemCount();
+    for (int i = 0; i < item_count; i++) {
+      if (menu_delegate_->IsItemSeparator(i + 1)) {
+        menu.AppendSeparator();
+      } else {
+        if (menu_delegate_->HasIcon(i + 1))
+          menu.AppendMenuItemWithIcon(i + 1, L"", SkBitmap());
+        else
+          menu.AppendMenuItem(i+1, L"", Menu::NORMAL);
+      }
+    }
+
+    menu.RunMenuAt(menu_position.x(), menu_position.y());
+
+    // Need to explicitly clear mouse handler so that events get sent
+    // properly after the menu finishes running. If we don't do this, then
+    // the first click to other parts of the UI is eaten.
+    SetMouseHandler(NULL);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// ButtonDropDown - Accessibility
+//
+////////////////////////////////////////////////////////////////////////////////
+
+bool ButtonDropDown::GetAccessibleDefaultAction(std::wstring* action) {
+  DCHECK(action);
+
+  action->assign(l10n_util::GetString(IDS_ACCACTION_PRESS));
+  return true;
+}
+
+bool ButtonDropDown::GetAccessibleRole(AccessibilityTypes::Role* role) {
+  DCHECK(role);
+
+  *role = AccessibilityTypes::ROLE_BUTTONDROPDOWN;
+  return true;
+}
+
+bool ButtonDropDown::GetAccessibleState(AccessibilityTypes::State* state) {
+  DCHECK(state);
+
+  *state = AccessibilityTypes::STATE_HASPOPUP;
+  return true;
+}
+
+}  // namespace views