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// Copyright (c) 2012 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 "ash/desktop_background/desktop_background_view.h"
#include <limits>
#include "ash/ash_export.h"
#include "ash/shell.h"
#include "ash/shell_window_ids.h"
#include "ash/wm/root_window_layout_manager.h"
#include "ash/wm/window_animations.h"
#include "base/message_loop.h"
#include "base/utf_string_conversions.h"
#include "grit/ui_resources.h"
#include "ui/aura/root_window.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/layer_animation_observer.h"
#include "ui/compositor/scoped_layer_animation_settings.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image.h"
#include "ui/views/widget/widget.h"
namespace ash {
namespace internal {
namespace {
class ShowWallpaperAnimationObserver : public ui::ImplicitAnimationObserver {
public:
explicit ShowWallpaperAnimationObserver(views::Widget* desktop_widget)
: desktop_widget_(desktop_widget) {
}
virtual ~ShowWallpaperAnimationObserver() {
}
private:
// Overridden from ui::ImplicitAnimationObserver:
virtual void OnImplicitAnimationsCompleted() OVERRIDE {
internal::RootWindowLayoutManager* root_window_layout =
Shell::GetInstance()->root_window_layout();
root_window_layout->SetBackgroundWidget(desktop_widget_);
MessageLoop::current()->DeleteSoon(FROM_HERE, this);
}
views::Widget* desktop_widget_;
DISALLOW_COPY_AND_ASSIGN(ShowWallpaperAnimationObserver);
};
} // namespace
// For our scaling ratios we need to round positive numbers.
static int RoundPositive(double x) {
return static_cast<int>(floor(x + 0.5));
}
////////////////////////////////////////////////////////////////////////////////
// DesktopBackgroundView, public:
DesktopBackgroundView::DesktopBackgroundView(const gfx::ImageSkia& wallpaper,
WallpaperLayout wallpaper_layout) {
wallpaper_ = wallpaper;
wallpaper_layout_ = wallpaper_layout;
}
DesktopBackgroundView::~DesktopBackgroundView() {
}
////////////////////////////////////////////////////////////////////////////////
// DesktopBackgroundView, views::View overrides:
void DesktopBackgroundView::OnPaint(gfx::Canvas* canvas) {
// Scale the image while maintaining the aspect ratio, cropping as
// necessary to fill the background. Ideally the image should be larger
// than the largest display supported, if not we will center it rather than
// streching to avoid upsampling artifacts (Note that we could tile too, but
// decided not to do this at the moment).
gfx::Rect wallpaper_rect(0, 0, wallpaper_.width(), wallpaper_.height());
if (wallpaper_layout_ == ash::CENTER_CROPPED && wallpaper_.width() > width()
&& wallpaper_.height() > height()) {
// The dimension with the smallest ratio must be cropped, the other one
// is preserved. Both are set in gfx::Size cropped_size.
double horizontal_ratio = static_cast<double>(width()) /
static_cast<double>(wallpaper_.width());
double vertical_ratio = static_cast<double>(height()) /
static_cast<double>(wallpaper_.height());
gfx::Size cropped_size;
if (vertical_ratio > horizontal_ratio) {
cropped_size = gfx::Size(
RoundPositive(static_cast<double>(width()) / vertical_ratio),
wallpaper_.height());
} else {
cropped_size = gfx::Size(wallpaper_.width(),
RoundPositive(static_cast<double>(height()) / horizontal_ratio));
}
gfx::Rect wallpaper_cropped_rect = wallpaper_rect.Center(cropped_size);
canvas->DrawBitmapInt(wallpaper_,
wallpaper_cropped_rect.x(), wallpaper_cropped_rect.y(),
wallpaper_cropped_rect.width(), wallpaper_cropped_rect.height(),
0, 0, width(), height(),
true);
} else if (wallpaper_layout_ == ash::TILE) {
canvas->TileImageInt(wallpaper_, 0, 0, width(), height());
} else if (wallpaper_layout_ == ash::STRETCH) {
// This is generally not recommended as it may show artifacts.
canvas->DrawBitmapInt(wallpaper_, 0, 0, wallpaper_.width(),
wallpaper_.height(), 0, 0, width(), height(), true);
} else {
// All other are simply centered, and not scaled (but may be clipped).
canvas->DrawBitmapInt(wallpaper_, (width() - wallpaper_.width()) / 2,
(height() - wallpaper_.height()) / 2);
}
}
bool DesktopBackgroundView::OnMousePressed(const views::MouseEvent& event) {
return true;
}
void DesktopBackgroundView::OnMouseReleased(const views::MouseEvent& event) {
if (event.IsRightMouseButton())
Shell::GetInstance()->ShowBackgroundMenu(GetWidget(), event.location());
}
void CreateDesktopBackground(const gfx::ImageSkia& wallpaper,
WallpaperLayout wallpaper_layout) {
views::Widget* desktop_widget = new views::Widget;
views::Widget::InitParams params(
views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
DesktopBackgroundView* view = new DesktopBackgroundView(wallpaper,
wallpaper_layout);
params.delegate = view;
params.parent =
Shell::GetInstance()->GetContainer(
ash::internal::kShellWindowId_DesktopBackgroundContainer);
desktop_widget->Init(params);
desktop_widget->SetContentsView(view);
ash::SetWindowVisibilityAnimationType(
desktop_widget->GetNativeView(),
ash::WINDOW_VISIBILITY_ANIMATION_TYPE_FADE);
ash::SetWindowVisibilityAnimationTransition(
desktop_widget->GetNativeView(),
ash::ANIMATE_SHOW);
desktop_widget->SetBounds(params.parent->bounds());
ui::ScopedLayerAnimationSettings settings(desktop_widget->GetNativeView()->
layer()->GetAnimator());
settings.SetPreemptionStrategy(ui::LayerAnimator::ENQUEUE_NEW_ANIMATION);
settings.AddObserver(new ShowWallpaperAnimationObserver(desktop_widget));
desktop_widget->Show();
desktop_widget->GetNativeView()->SetName("DesktopBackgroundView");
}
} // namespace internal
} // namespace ash
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