src/ash/display/screen_position_controller.cc

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