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// Copyright (c) 2009 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/menu/menu_scroll_view_container.h"
#if defined(OS_WIN)
#include <windows.h>
#include <uxtheme.h>
#include <Vssym32.h>
#endif
#include "app/gfx/canvas.h"
#include "app/gfx/color_utils.h"
#include "views/border.h"
#include "views/controls/menu/menu_config.h"
#include "views/controls/menu/menu_controller.h"
#include "views/controls/menu/menu_item_view.h"
#include "views/controls/menu/submenu_view.h"
#if defined(OS_WIN)
#include "base/gfx/native_theme.h"
#endif
#if defined(OS_WIN)
using gfx::NativeTheme;
#endif
// Height of the scroll arrow.
// This goes up to 4 with large fonts, but this is close enough for now.
static const int scroll_arrow_height = 3;
namespace views {
namespace {
// 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_(MenuItemView::pref_menu_height()) {
}
virtual gfx::Size GetPreferredSize() {
return gfx::Size(MenuConfig::instance().scroll_arrow_height * 2 - 1,
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(gfx::Canvas* canvas) {
const MenuConfig& config = MenuConfig::instance();
#if defined(OS_WIN)
HDC dc = canvas->beginPlatformPaint();
// The background.
RECT item_bounds = { 0, 0, width(), height() };
NativeTheme::instance()->PaintMenuItemBackground(
NativeTheme::MENU, dc, MENU_POPUPITEM, MPI_NORMAL, false,
&item_bounds);
canvas->endPlatformPaint();
SkColor arrow_color = color_utils::GetSysSkColor(COLOR_MENUTEXT);
#else
SkColor arrow_color = SK_ColorBLACK;
#endif
// Then the arrow.
int x = width() / 2;
int y = (height() - config.scroll_arrow_height) / 2;
int delta_y = 1;
if (!is_up_) {
delta_y = -1;
y += config.scroll_arrow_height;
}
for (int i = 0; i < config.scroll_arrow_height; ++i, --x, y += delta_y)
canvas->FillRectInt(arrow_color, x, y, (i * 2) + 1, 1);
}
private:
// SubmenuView we were created for.
SubmenuView* host_;
// Direction of the button.
bool is_up_;
// Preferred height.
int pref_height_;
DISALLOW_COPY_AND_ASSIGN(MenuScrollButton);
};
} // namespace
// 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, so we use a one off variant.
class MenuScrollViewContainer::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->y();
gfx::Size pref = child->GetPreferredSize();
// Constrain y to make sure we don't show past the bottom of the view.
y = std::max(0, std::min(pref.height() - this->height(), y));
child->SetY(-y);
}
// Returns the contents, which is the SubmenuView.
View* GetContents() {
return GetChildViewAt(0);
}
private:
DISALLOW_COPY_AND_ASSIGN(MenuScrollView);
};
// MenuScrollViewContainer ----------------------------------------------------
MenuScrollViewContainer::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_);
set_border(Border::CreateEmptyBorder(
SubmenuView::kSubmenuBorderSize,
SubmenuView::kSubmenuBorderSize,
SubmenuView::kSubmenuBorderSize,
SubmenuView::kSubmenuBorderSize));
}
void MenuScrollViewContainer::Paint(gfx::Canvas* canvas) {
#if defined(OS_WIN)
HDC dc = canvas->beginPlatformPaint();
RECT bounds = {0, 0, width(), height()};
NativeTheme::instance()->PaintMenuBackground(
NativeTheme::MENU, dc, MENU_POPUPBACKGROUND, 0, &bounds);
canvas->endPlatformPaint();
#else
// This is the same as COLOR_TOOLBAR.
canvas->drawColor(SkColorSetRGB(210, 225, 246), SkXfermode::kSrc_Mode);
#endif
}
void MenuScrollViewContainer::Layout() {
gfx::Insets insets = GetInsets();
int x = insets.left();
int y = insets.top();
int width = View::width() - insets.width();
int content_height = height() - insets.height();
if (!scroll_up_button_->IsVisible()) {
scroll_view_->SetBounds(x, y, width, content_height);
scroll_view_->Layout();
return;
}
gfx::Size pref = scroll_up_button_->GetPreferredSize();
scroll_up_button_->SetBounds(x, y, width, pref.height());
content_height -= pref.height();
const int scroll_view_y = y + pref.height();
pref = scroll_down_button_->GetPreferredSize();
scroll_down_button_->SetBounds(x, height() - pref.height() - insets.top(),
width, pref.height());
content_height -= pref.height();
scroll_view_->SetBounds(x, scroll_view_y, width, content_height);
scroll_view_->Layout();
}
void MenuScrollViewContainer::DidChangeBounds(const gfx::Rect& previous,
const gfx::Rect& current) {
gfx::Size content_pref = scroll_view_->GetContents()->GetPreferredSize();
scroll_up_button_->SetVisible(content_pref.height() > height());
scroll_down_button_->SetVisible(content_pref.height() > height());
}
gfx::Size MenuScrollViewContainer::GetPreferredSize() {
gfx::Size prefsize = scroll_view_->GetContents()->GetPreferredSize();
gfx::Insets insets = GetInsets();
prefsize.Enlarge(insets.width(), insets.height());
return prefsize;
}
} // namespace views
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