screen_position_controller.cc revision 2385ea399aae016c0806a4f9ef3c9cfe3d2a39df 
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.
4
5#include "ash/display/screen_position_controller.h"
6
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 "ui/aura/client/activation_client.h"
15#include "ui/aura/client/capture_client.h"
16#include "ui/aura/client/focus_client.h"
17#include "ui/aura/client/stacking_client.h"
18#include "ui/aura/root_window.h"
19#include "ui/aura/window_tracker.h"
20#include "ui/compositor/dip_util.h"
21#include "ui/gfx/display.h"
22#include "ui/gfx/screen.h"
23
24namespace ash {
25namespace {
26
27// Return true if the window or its ancestor has |kStayInSameRootWindowkey|
28// property.
29bool ShouldStayInSameRootWindow(const aura::Window* window) {
30  return window &&
31      (window->GetProperty(internal::kStayInSameRootWindowKey) ||
32       ShouldStayInSameRootWindow(window->parent()));
33}
34
35// Move all transient children to |dst_root|, including the ones in
36// the child windows and transient children of the transient children.
37void MoveAllTransientChildrenToNewRoot(const gfx::Display& display,
38                                       aura::Window* window) {
39  aura::RootWindow* dst_root = Shell::GetInstance()->display_controller()->
40      GetRootWindowForDisplayId(display.id());
41  aura::Window::Windows transient_children = window->transient_children();
42  for (aura::Window::Windows::iterator iter = transient_children.begin();
43       iter != transient_children.end(); ++iter) {
44    aura::Window* transient_child = *iter;
45    int container_id = transient_child->parent()->id();
46    DCHECK_GE(container_id, 0);
47    aura::Window* container = Shell::GetContainer(dst_root, container_id);
48    gfx::Rect parent_bounds_in_screen = transient_child->GetBoundsInScreen();
49    container->AddChild(transient_child);
50    transient_child->SetBoundsInScreen(parent_bounds_in_screen, display);
51
52    // Transient children may have transient children.
53    MoveAllTransientChildrenToNewRoot(display, transient_child);
54  }
55  // Move transient children of the child windows if any.
56  aura::Window::Windows children = window->children();
57  for (aura::Window::Windows::iterator iter = children.begin();
58       iter != children.end(); ++iter)
59    MoveAllTransientChildrenToNewRoot(display, *iter);
60}
61
62// Finds the root window at |location| in |window|'s coordinates and returns a
63// pair of root window and location in that root window's coordinates. The
64// function usually returns |window->GetRootWindow()|, but if the mouse pointer
65// is moved outside the |window|'s root while the mouse is captured, it returns
66// the other root window.
67std::pair<aura::RootWindow*, gfx::Point> GetRootWindowRelativeToWindow(
68    aura::Window* window,
69    const gfx::Point& location) {
70  aura::RootWindow* root_window = window->GetRootWindow();
71  gfx::Point location_in_root(location);
72  aura::Window::ConvertPointToTarget(window, root_window, &location_in_root);
73
74#if defined(USE_X11)
75  if (!root_window->ContainsPointInRoot(location_in_root)) {
76    // This conversion is necessary to deal with X's passive input
77    // grab while dragging window. For example, if we have two
78    // displays, say 1000x1000 (primary) and 500x500 (extended one
79    // on the right), and start dragging a window at (999, 123), and
80    // then move the pointer to the right, the pointer suddenly
81    // warps to the extended display. The destination is (0, 123) in
82    // the secondary root window's coordinates, or (1000, 123) in
83    // the screen coordinates. However, since the mouse is captured
84    // by X during drag, a weird LocatedEvent, something like (0, 1123)
85    // in the *primary* root window's coordinates, is sent to Chrome
86    // (Remember that in the native X11 world, the two root windows
87    // are always stacked vertically regardless of the display
88    // layout in Ash). We need to figure out that (0, 1123) in the
89    // primary root window's coordinates is actually (0, 123) in the
90    // extended root window's coordinates.
91
92    gfx::Point location_in_native(location_in_root);
93    root_window->ConvertPointToNativeScreen(&location_in_native);
94
95    Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
96    for (size_t i = 0; i < root_windows.size(); ++i) {
97      const gfx::Rect native_bounds(
98          root_windows[i]->GetHostOrigin(),
99          root_windows[i]->GetHostSize());  // in px.
100      if (native_bounds.Contains(location_in_native)) {
101        root_window = root_windows[i];
102        location_in_root = location_in_native;
103        root_window->ConvertPointFromNativeScreen(&location_in_root);
104        break;
105      }
106    }
107  }
108#else
109  // TODO(yusukes): Support non-X11 platforms if necessary.
110#endif
111
112  return std::make_pair(root_window, location_in_root);
113}
114
115}  // namespace
116
117namespace internal {
118
119void ScreenPositionController::ConvertPointToScreen(
120    const aura::Window* window,
121    gfx::Point* point) {
122  const aura::RootWindow* root = window->GetRootWindow();
123  aura::Window::ConvertPointToTarget(window, root, point);
124  const gfx::Point display_origin = Shell::GetScreen()->GetDisplayNearestWindow(
125      const_cast<aura::RootWindow*>(root)).bounds().origin();
126  point->Offset(display_origin.x(), display_origin.y());
127}
128
129void ScreenPositionController::ConvertPointFromScreen(
130    const aura::Window* window,
131    gfx::Point* point) {
132  const aura::RootWindow* root = window->GetRootWindow();
133  const gfx::Point display_origin = Shell::GetScreen()->GetDisplayNearestWindow(
134      const_cast<aura::RootWindow*>(root)).bounds().origin();
135  point->Offset(-display_origin.x(), -display_origin.y());
136  aura::Window::ConvertPointToTarget(root, window, point);
137}
138
139void ScreenPositionController::ConvertHostPointToScreen(
140    aura::RootWindow* root_window,
141    gfx::Point* point) {
142  root_window->ConvertPointFromHost(point);
143  std::pair<aura::RootWindow*, gfx::Point> pair =
144      GetRootWindowRelativeToWindow(root_window, *point);
145  *point = pair.second;
146  ConvertPointToScreen(pair.first, point);
147}
148
149void ScreenPositionController::SetBounds(aura::Window* window,
150                                         const gfx::Rect& bounds,
151                                         const gfx::Display& display) {
152  DCHECK_NE(-1, display.id());
153  if (!window->parent()->GetProperty(internal::kUsesScreenCoordinatesKey)) {
154    window->SetBounds(bounds);
155    return;
156  }
157
158  // Don't move a window to other root window if:
159  // a) the window is a transient window. It moves when its
160  //    transient_parent moves.
161  // b) if the window or its ancestor has kStayInSameRootWindowkey. It's
162  //    intentionally kept in the same root window even if the bounds is
163  //    outside of the display.
164  if (!window->transient_parent() &&
165      !ShouldStayInSameRootWindow(window)) {
166    aura::RootWindow* dst_root =
167        Shell::GetInstance()->display_controller()->GetRootWindowForDisplayId(
168            display.id());
169    DCHECK(dst_root);
170    aura::Window* dst_container = NULL;
171    if (dst_root != window->GetRootWindow()) {
172      int container_id = window->parent()->id();
173      // Dragging a docked window to another root window should show it floating
174      // rather than docked in another screen's dock.
175      if (container_id == kShellWindowId_DockedContainer)
176        container_id = kShellWindowId_DefaultContainer;
177      // All containers that uses screen coordinates must have valid window ids.
178      DCHECK_GE(container_id, 0);
179      // Don't move modal background.
180      if (!SystemModalContainerLayoutManager::IsModalBackground(window))
181        dst_container = Shell::GetContainer(dst_root, container_id);
182    }
183
184    if (dst_container && window->parent() != dst_container) {
185      aura::Window* focused = aura::client::GetFocusClient(window)->
186          GetFocusedWindow();
187      aura::client::ActivationClient* activation_client =
188          aura::client::GetActivationClient(window->GetRootWindow());
189      aura::Window* active = activation_client->GetActiveWindow();
190
191      aura::WindowTracker tracker;
192      if (focused)
193        tracker.Add(focused);
194      if (active && focused != active)
195        tracker.Add(active);
196
197      dst_container->AddChild(window);
198
199      MoveAllTransientChildrenToNewRoot(display, window);
200
201      // Restore focused/active window.
202      if (tracker.Contains(focused)) {
203        aura::client::GetFocusClient(window)->FocusWindow(focused);
204        ash::Shell::GetInstance()->set_active_root_window(
205            focused->GetRootWindow());
206      } else if (tracker.Contains(active)) {
207        activation_client->ActivateWindow(active);
208      }
209    }
210  }
211
212  gfx::Point origin(bounds.origin());
213  const gfx::Point display_origin = Shell::GetScreen()->GetDisplayNearestWindow(
214      window).bounds().origin();
215  origin.Offset(-display_origin.x(), -display_origin.y());
216  window->SetBounds(gfx::Rect(origin, bounds.size()));
217}
218
219}  // internal
220}  // ash
221