1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "ash/desktop_background/desktop_background_view.h"
9 #include "ash/ash_export.h"
10 #include "ash/desktop_background/desktop_background_controller.h"
11 #include "ash/desktop_background/desktop_background_widget_controller.h"
12 #include "ash/desktop_background/user_wallpaper_delegate.h"
13 #include "ash/display/display_manager.h"
14 #include "ash/root_window_controller.h"
15 #include "ash/session/session_state_delegate.h"
16 #include "ash/shell.h"
17 #include "ash/shell_window_ids.h"
18 #include "ash/wm/overview/window_selector_controller.h"
19 #include "ash/wm/window_animations.h"
20 #include "base/message_loop/message_loop.h"
21 #include "base/strings/utf_string_conversions.h"
22 #include "ui/aura/window_event_dispatcher.h"
23 #include "ui/compositor/layer.h"
24 #include "ui/gfx/canvas.h"
25 #include "ui/gfx/geometry/safe_integer_conversions.h"
26 #include "ui/gfx/geometry/size_conversions.h"
27 #include "ui/gfx/image/image.h"
28 #include "ui/gfx/transform.h"
29 #include "ui/views/widget/widget.h"
31 using wallpaper::WallpaperLayout
;
32 using wallpaper::WALLPAPER_LAYOUT_CENTER
;
33 using wallpaper::WALLPAPER_LAYOUT_CENTER_CROPPED
;
34 using wallpaper::WALLPAPER_LAYOUT_STRETCH
;
35 using wallpaper::WALLPAPER_LAYOUT_TILE
;
40 // A view that controls the child view's layer so that the layer
41 // always has the same size as the display's original, un-scaled size
42 // in DIP. The layer then transformed to fit to the virtual screen
43 // size when laid-out.
44 // This is to avoid scaling the image at painting time, then scaling
45 // it back to the screen size in the compositor.
46 class LayerControlView
: public views::View
{
48 explicit LayerControlView(views::View
* view
) {
50 view
->SetPaintToLayer(true);
53 // Overrides views::View.
54 void Layout() override
{
55 gfx::Display display
= Shell::GetScreen()->GetDisplayNearestWindow(
56 GetWidget()->GetNativeView());
57 DisplayManager
* display_manager
= Shell::GetInstance()->display_manager();
58 DisplayInfo info
= display_manager
->GetDisplayInfo(display
.id());
59 float ui_scale
= info
.GetEffectiveUIScale();
60 gfx::SizeF pixel_size
= display
.size();
61 pixel_size
.Scale(1.0f
/ ui_scale
);
62 gfx::Size rounded_size
= gfx::ToFlooredSize(pixel_size
);
63 DCHECK_EQ(1, child_count());
64 views::View
* child
= child_at(0);
65 child
->SetBounds(0, 0, rounded_size
.width(), rounded_size
.height());
66 gfx::Transform transform
;
67 // Apply RTL transform explicitly becacuse Views layer code
68 // doesn't handle RTL. crbug.com/458753.
69 transform
.Translate(-child
->GetMirroredX(), 0);
70 transform
.Scale(ui_scale
, ui_scale
);
71 child
->SetTransform(transform
);
75 DISALLOW_COPY_AND_ASSIGN(LayerControlView
);
80 // This event handler receives events in the pre-target phase and takes care of
82 // - Disabling overview mode on touch release.
83 // - Disabling overview mode on mouse release.
84 class PreEventDispatchHandler
: public ui::EventHandler
{
86 PreEventDispatchHandler() {}
87 ~PreEventDispatchHandler() override
{}
91 void OnMouseEvent(ui::MouseEvent
* event
) override
{
92 CHECK_EQ(ui::EP_PRETARGET
, event
->phase());
93 WindowSelectorController
* controller
=
94 Shell::GetInstance()->window_selector_controller();
95 if (event
->type() == ui::ET_MOUSE_RELEASED
&& controller
->IsSelecting()) {
96 controller
->ToggleOverview();
97 event
->StopPropagation();
101 void OnGestureEvent(ui::GestureEvent
* event
) override
{
102 CHECK_EQ(ui::EP_PRETARGET
, event
->phase());
103 WindowSelectorController
* controller
=
104 Shell::GetInstance()->window_selector_controller();
105 if (event
->type() == ui::ET_GESTURE_TAP
&& controller
->IsSelecting()) {
106 controller
->ToggleOverview();
107 event
->StopPropagation();
111 DISALLOW_COPY_AND_ASSIGN(PreEventDispatchHandler
);
114 ////////////////////////////////////////////////////////////////////////////////
115 // DesktopBackgroundView, public:
117 DesktopBackgroundView::DesktopBackgroundView()
118 : pre_dispatch_handler_(new PreEventDispatchHandler()) {
119 set_context_menu_controller(this);
120 AddPreTargetHandler(pre_dispatch_handler_
.get());
123 DesktopBackgroundView::~DesktopBackgroundView() {
124 RemovePreTargetHandler(pre_dispatch_handler_
.get());
127 ////////////////////////////////////////////////////////////////////////////////
128 // DesktopBackgroundView, views::View overrides:
130 void DesktopBackgroundView::OnPaint(gfx::Canvas
* canvas
) {
131 // Scale the image while maintaining the aspect ratio, cropping as
132 // necessary to fill the background. Ideally the image should be larger
133 // than the largest display supported, if not we will scale and center it if
134 // the layout is WALLPAPER_LAYOUT_CENTER_CROPPED.
135 DesktopBackgroundController
* controller
=
136 Shell::GetInstance()->desktop_background_controller();
137 gfx::ImageSkia wallpaper
= controller
->GetWallpaper();
138 WallpaperLayout wallpaper_layout
= controller
->GetWallpaperLayout();
140 if (wallpaper
.isNull()) {
141 canvas
->FillRect(GetLocalBounds(), SK_ColorBLACK
);
145 if (wallpaper_layout
== WALLPAPER_LAYOUT_CENTER_CROPPED
) {
146 // The dimension with the smallest ratio must be cropped, the other one
147 // is preserved. Both are set in gfx::Size cropped_size.
148 double horizontal_ratio
= static_cast<double>(width()) /
149 static_cast<double>(wallpaper
.width());
150 double vertical_ratio
= static_cast<double>(height()) /
151 static_cast<double>(wallpaper
.height());
153 gfx::Size cropped_size
;
154 if (vertical_ratio
> horizontal_ratio
) {
155 cropped_size
= gfx::Size(
156 gfx::ToFlooredInt(static_cast<double>(width()) / vertical_ratio
),
159 cropped_size
= gfx::Size(
161 gfx::ToFlooredInt(static_cast<double>(height()) / horizontal_ratio
));
164 gfx::Rect
wallpaper_cropped_rect(
165 0, 0, wallpaper
.width(), wallpaper
.height());
166 wallpaper_cropped_rect
.ClampToCenteredSize(cropped_size
);
167 canvas
->DrawImageInt(wallpaper
,
168 wallpaper_cropped_rect
.x(), wallpaper_cropped_rect
.y(),
169 wallpaper_cropped_rect
.width(), wallpaper_cropped_rect
.height(),
170 0, 0, width(), height(),
172 } else if (wallpaper_layout
== WALLPAPER_LAYOUT_TILE
) {
173 canvas
->TileImageInt(wallpaper
, 0, 0, width(), height());
174 } else if (wallpaper_layout
== WALLPAPER_LAYOUT_STRETCH
) {
175 // This is generally not recommended as it may show artifacts.
176 canvas
->DrawImageInt(wallpaper
, 0, 0, wallpaper
.width(),
177 wallpaper
.height(), 0, 0, width(), height(), true);
179 // Fill with black to make sure that the entire area is opaque.
180 canvas
->FillRect(GetLocalBounds(), SK_ColorBLACK
);
181 float image_scale
= canvas
->image_scale();
182 gfx::Rect
wallpaper_rect(0, 0, wallpaper
.width() / image_scale
,
183 wallpaper
.height() / image_scale
);
184 // All other are simply centered, and not scaled (but may be clipped).
185 canvas
->DrawImageInt(
187 0, 0, wallpaper
.width(), wallpaper
.height(),
188 (width() - wallpaper_rect
.width()) / 2,
189 (height() - wallpaper_rect
.height()) / 2,
190 wallpaper_rect
.width(),
191 wallpaper_rect
.height(),
196 bool DesktopBackgroundView::OnMousePressed(const ui::MouseEvent
& event
) {
200 void DesktopBackgroundView::ShowContextMenuForView(
202 const gfx::Point
& point
,
203 ui::MenuSourceType source_type
) {
204 Shell::GetInstance()->ShowContextMenu(point
, source_type
);
207 views::Widget
* CreateDesktopBackground(aura::Window
* root_window
,
209 DesktopBackgroundController
* controller
=
210 Shell::GetInstance()->desktop_background_controller();
211 UserWallpaperDelegate
* wallpaper_delegate
=
212 Shell::GetInstance()->user_wallpaper_delegate();
214 views::Widget
* desktop_widget
= new views::Widget
;
215 views::Widget::InitParams
params(
216 views::Widget::InitParams::TYPE_WINDOW_FRAMELESS
);
217 if (controller
->GetWallpaper().isNull())
218 params
.opacity
= views::Widget::InitParams::TRANSLUCENT_WINDOW
;
219 params
.parent
= root_window
->GetChildById(container_id
);
220 desktop_widget
->Init(params
);
221 desktop_widget
->SetContentsView(
222 new LayerControlView(new DesktopBackgroundView()));
223 int animation_type
= wallpaper_delegate
->GetAnimationType();
224 wm::SetWindowVisibilityAnimationType(
225 desktop_widget
->GetNativeView(), animation_type
);
227 RootWindowController
* root_window_controller
=
228 GetRootWindowController(root_window
);
230 // Enable wallpaper transition for the following cases:
231 // 1. Initial(OOBE) wallpaper animation.
232 // 2. Wallpaper fades in from a non empty background.
233 // 3. From an empty background, chrome transit to a logged in user session.
234 // 4. From an empty background, guest user logged in.
235 if (wallpaper_delegate
->ShouldShowInitialAnimation() ||
236 root_window_controller
->animating_wallpaper_controller() ||
237 Shell::GetInstance()->session_state_delegate()->NumberOfLoggedInUsers()) {
238 wm::SetWindowVisibilityAnimationTransition(
239 desktop_widget
->GetNativeView(), wm::ANIMATE_SHOW
);
240 int duration_override
= wallpaper_delegate
->GetAnimationDurationOverride();
241 if (duration_override
) {
242 wm::SetWindowVisibilityAnimationDuration(
243 desktop_widget
->GetNativeView(),
244 base::TimeDelta::FromMilliseconds(duration_override
));
247 // Disable animation if transition to login screen from an empty background.
248 wm::SetWindowVisibilityAnimationTransition(
249 desktop_widget
->GetNativeView(), wm::ANIMATE_NONE
);
252 desktop_widget
->SetBounds(params
.parent
->bounds());
253 return desktop_widget
;