Don't preload rarely seen large images
[chromium-blink-merge.git] / ash / display / screen_position_controller.cc
blob05e917485e60471c4191363d99cb3af3750fb8c0
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/display/screen_position_controller.h"
7 #include "ash/display/display_controller.h"
8 #include "ash/root_window_controller.h"
9 #include "ash/shell.h"
10 #include "ash/shell_window_ids.h"
11 #include "ash/wm/coordinate_conversion.h"
12 #include "ash/wm/system_modal_container_layout_manager.h"
13 #include "ash/wm/window_properties.h"
14 #include "ash/wm/window_state.h"
15 #include "ui/aura/client/capture_client.h"
16 #include "ui/aura/client/focus_client.h"
17 #include "ui/aura/window_event_dispatcher.h"
18 #include "ui/aura/window_tracker.h"
19 #include "ui/compositor/dip_util.h"
20 #include "ui/gfx/display.h"
21 #include "ui/gfx/screen.h"
22 #include "ui/wm/core/window_util.h"
23 #include "ui/wm/public/activation_client.h"
25 namespace ash {
26 namespace {
28 // Return true if the window or its ancestor has |kStayInSameRootWindowkey|
29 // property.
30 bool ShouldStayInSameRootWindow(const aura::Window* window) {
31 return window && (window->GetProperty(kStayInSameRootWindowKey) ||
32 ShouldStayInSameRootWindow(window->parent()));
35 // Move all transient children to |dst_root|, including the ones in
36 // the child windows and transient children of the transient children.
37 void MoveAllTransientChildrenToNewRoot(const gfx::Display& display,
38 aura::Window* window) {
39 aura::Window* dst_root = Shell::GetInstance()->display_controller()->
40 GetRootWindowForDisplayId(display.id());
41 aura::Window::Windows transient_children =
42 ::wm::GetTransientChildren(window);
43 for (aura::Window::Windows::iterator iter = transient_children.begin();
44 iter != transient_children.end(); ++iter) {
45 aura::Window* transient_child = *iter;
46 int container_id = transient_child->parent()->id();
47 DCHECK_GE(container_id, 0);
48 aura::Window* container = Shell::GetContainer(dst_root, container_id);
49 gfx::Rect parent_bounds_in_screen = transient_child->GetBoundsInScreen();
50 container->AddChild(transient_child);
51 transient_child->SetBoundsInScreen(parent_bounds_in_screen, display);
53 // Transient children may have transient children.
54 MoveAllTransientChildrenToNewRoot(display, transient_child);
56 // Move transient children of the child windows if any.
57 aura::Window::Windows children = window->children();
58 for (aura::Window::Windows::iterator iter = children.begin();
59 iter != children.end(); ++iter)
60 MoveAllTransientChildrenToNewRoot(display, *iter);
63 } // namespace
65 // static
66 void ScreenPositionController::ConvertHostPointToRelativeToRootWindow(
67 aura::Window* root_window,
68 const aura::Window::Windows& root_windows,
69 gfx::Point* point,
70 aura::Window** target_root) {
71 DCHECK(!root_window->parent());
72 gfx::Point point_in_root(*point);
73 root_window->GetHost()->ConvertPointFromHost(&point_in_root);
75 *target_root = root_window;
76 *point = point_in_root;
78 #if defined(USE_X11) || defined(USE_OZONE)
79 if (!root_window->ContainsPointInRoot(point_in_root)) {
80 // This conversion is necessary to deal with X's passive input
81 // grab while dragging window. For example, if we have two
82 // displays, say 1000x1000 (primary) and 500x500 (extended one
83 // on the right), and start dragging a window at (999, 123), and
84 // then move the pointer to the right, the pointer suddenly
85 // warps to the extended display. The destination is (0, 123) in
86 // the secondary root window's coordinates, or (1000, 123) in
87 // the screen coordinates. However, since the mouse is captured
88 // by X during drag, a weird LocatedEvent, something like (0, 1123)
89 // in the *primary* root window's coordinates, is sent to Chrome
90 // (Remember that in the native X11 world, the two root windows
91 // are always stacked vertically regardless of the display
92 // layout in Ash). We need to figure out that (0, 1123) in the
93 // primary root window's coordinates is actually (0, 123) in the
94 // extended root window's coordinates.
96 // For now Ozone works in a similar manner as X11. Transitioning from one
97 // display's coordinate system to anothers may cause events in the
98 // primary's coordinate system which fall in the extended display.
100 gfx::Point location_in_native(point_in_root);
102 root_window->GetHost()->ConvertPointToNativeScreen(&location_in_native);
104 for (size_t i = 0; i < root_windows.size(); ++i) {
105 aura::WindowTreeHost* host = root_windows[i]->GetHost();
106 const gfx::Rect native_bounds = host->GetBounds();
107 if (native_bounds.Contains(location_in_native)) {
108 *target_root = root_windows[i];
109 *point = location_in_native;
110 host->ConvertPointFromNativeScreen(point);
111 break;
115 #else
116 NOTIMPLEMENTED();
117 #endif
120 void ScreenPositionController::ConvertPointToScreen(
121 const aura::Window* window,
122 gfx::Point* point) {
123 const aura::Window* root = window->GetRootWindow();
124 aura::Window::ConvertPointToTarget(window, root, point);
125 const gfx::Point display_origin = Shell::GetScreen()->GetDisplayNearestWindow(
126 const_cast<aura::Window*>(root)).bounds().origin();
127 point->Offset(display_origin.x(), display_origin.y());
130 void ScreenPositionController::ConvertPointFromScreen(
131 const aura::Window* window,
132 gfx::Point* point) {
133 const aura::Window* root = window->GetRootWindow();
134 const gfx::Point display_origin = Shell::GetScreen()->GetDisplayNearestWindow(
135 const_cast<aura::Window*>(root)).bounds().origin();
136 point->Offset(-display_origin.x(), -display_origin.y());
137 aura::Window::ConvertPointToTarget(root, window, point);
140 void ScreenPositionController::ConvertHostPointToScreen(
141 aura::Window* root_window,
142 gfx::Point* point) {
143 aura::Window* root = root_window->GetRootWindow();
144 aura::Window* target_root = nullptr;
145 ConvertHostPointToRelativeToRootWindow(root, Shell::GetAllRootWindows(),
146 point, &target_root);
147 ConvertPointToScreen(target_root, point);
150 void ScreenPositionController::SetBounds(aura::Window* window,
151 const gfx::Rect& bounds,
152 const gfx::Display& display) {
153 DCHECK_NE(-1, display.id());
154 if (!window->parent()->GetProperty(kUsesScreenCoordinatesKey)) {
155 window->SetBounds(bounds);
156 return;
159 // Don't move a window to other root window if:
160 // a) the window is a transient window. It moves when its
161 // transient_parent moves.
162 // b) if the window or its ancestor has kStayInSameRootWindowkey. It's
163 // intentionally kept in the same root window even if the bounds is
164 // outside of the display.
165 if (!::wm::GetTransientParent(window) &&
166 !ShouldStayInSameRootWindow(window)) {
167 aura::Window* dst_root =
168 Shell::GetInstance()->display_controller()->GetRootWindowForDisplayId(
169 display.id());
170 DCHECK(dst_root);
171 aura::Window* dst_container = NULL;
172 if (dst_root != window->GetRootWindow()) {
173 int container_id = window->parent()->id();
174 // All containers that uses screen coordinates must have valid window ids.
175 DCHECK_GE(container_id, 0);
176 // Don't move modal background.
177 if (!SystemModalContainerLayoutManager::IsModalBackground(window))
178 dst_container = Shell::GetContainer(dst_root, container_id);
181 if (dst_container && window->parent() != dst_container) {
182 aura::Window* focused = aura::client::GetFocusClient(window)->
183 GetFocusedWindow();
184 aura::client::ActivationClient* activation_client =
185 aura::client::GetActivationClient(window->GetRootWindow());
186 aura::Window* active = activation_client->GetActiveWindow();
188 aura::WindowTracker tracker;
189 if (focused)
190 tracker.Add(focused);
191 if (active && focused != active)
192 tracker.Add(active);
194 // Set new bounds now so that the container's layout manager
195 // can adjust the bounds if necessary.
196 gfx::Point origin = bounds.origin();
197 const gfx::Point display_origin = display.bounds().origin();
198 origin.Offset(-display_origin.x(), -display_origin.y());
199 gfx::Rect new_bounds = gfx::Rect(origin, bounds.size());
201 window->SetBounds(new_bounds);
203 dst_container->AddChild(window);
205 MoveAllTransientChildrenToNewRoot(display, window);
207 // Restore focused/active window.
208 if (tracker.Contains(focused)) {
209 aura::client::GetFocusClient(window)->FocusWindow(focused);
210 // TODO(beng): replace with GetRootWindow().
211 ash::Shell::GetInstance()->set_target_root_window(
212 focused->GetRootWindow());
213 } else if (tracker.Contains(active)) {
214 activation_client->ActivateWindow(active);
216 // TODO(oshima): We should not have to update the bounds again
217 // below in theory, but we currently do need as there is a code
218 // that assumes that the bounds will never be overridden by the
219 // layout mananger. We should have more explicit control how
220 // constraints are applied by the layout manager.
223 gfx::Point origin(bounds.origin());
224 const gfx::Point display_origin = Shell::GetScreen()->GetDisplayNearestWindow(
225 window).bounds().origin();
226 origin.Offset(-display_origin.x(), -display_origin.y());
227 window->SetBounds(gfx::Rect(origin, bounds.size()));
230 } // namespace ash