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 "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"
  24
  25 namespace ash {
  26 namespace {
  27
  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()));
  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.
  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);
  52
  53     // Transient children may have transient children.
  54     MoveAllTransientChildrenToNewRoot(display, transient_child);
  55   }
  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);
  61 }
  62
  63 // Finds the root window at |location| in |window|'s coordinates and returns a
  64 // pair of root window and location in that root window's coordinates. The
  65 // function usually returns |window->GetRootWindow()|, but if the mouse pointer
  66 // is moved outside the |window|'s root while the mouse is captured, it returns
  67 // the other root window.
  68 std::pair<aura::Window*, gfx::Point> GetRootWindowRelativeToWindow(
  69     aura::Window* window,
  70     const gfx::Point& location) {
  71   aura::Window* root_window = window->GetRootWindow();
  72   gfx::Point location_in_root(location);
  73   aura::Window::ConvertPointToTarget(window, root_window, &location_in_root);
  74
  75 #if defined(USE_X11) || defined(USE_OZONE)
  76   if (!root_window->ContainsPointInRoot(location_in_root)) {
  77     // This conversion is necessary to deal with X's passive input
  78     // grab while dragging window. For example, if we have two
  79     // displays, say 1000x1000 (primary) and 500x500 (extended one
  80     // on the right), and start dragging a window at (999, 123), and
  81     // then move the pointer to the right, the pointer suddenly
  82     // warps to the extended display. The destination is (0, 123) in
  83     // the secondary root window's coordinates, or (1000, 123) in
  84     // the screen coordinates. However, since the mouse is captured
  85     // by X during drag, a weird LocatedEvent, something like (0, 1123)
  86     // in the *primary* root window's coordinates, is sent to Chrome
  87     // (Remember that in the native X11 world, the two root windows
  88     // are always stacked vertically regardless of the display
  89     // layout in Ash). We need to figure out that (0, 1123) in the
  90     // primary root window's coordinates is actually (0, 123) in the
  91     // extended root window's coordinates.
  92     //
  93     // For now Ozone works in a similar manner as X11. Transitioning from one
  94     // display's coordinate system to anothers may cause events in the
  95     // primary's coordinate system which fall in the extended display.
  96
  97     gfx::Point location_in_native(location_in_root);
  98     root_window->GetHost()->ConvertPointToNativeScreen(&location_in_native);
  99
 100     aura::Window::Windows root_windows = Shell::GetAllRootWindows();
 101     for (size_t i = 0; i < root_windows.size(); ++i) {
 102       aura::WindowTreeHost* host = root_windows[i]->GetHost();
 103       const gfx::Rect native_bounds = host->GetBounds();
 104       if (native_bounds.Contains(location_in_native)) {
 105         root_window = root_windows[i];
 106         location_in_root = location_in_native;
 107         host->ConvertPointFromNativeScreen(&location_in_root);
 108         break;
 109       }
 110     }
 111   }
 112 #else
 113   // TODO(yusukes): Support non-X11 platforms if necessary.
 114   NOTIMPLEMENTED();
 115 #endif
 116
 117   return std::make_pair(root_window, location_in_root);
 118 }
 119
 120 }  // namespace
 121
 122 void ScreenPositionController::ConvertPointToScreen(
 123     const aura::Window* window,
 124     gfx::Point* point) {
 125   const aura::Window* root = window->GetRootWindow();
 126   aura::Window::ConvertPointToTarget(window, root, point);
 127   const gfx::Point display_origin = Shell::GetScreen()->GetDisplayNearestWindow(
 128       const_cast<aura::Window*>(root)).bounds().origin();
 129   point->Offset(display_origin.x(), display_origin.y());
 130 }
 131
 132 void ScreenPositionController::ConvertPointFromScreen(
 133     const aura::Window* window,
 134     gfx::Point* point) {
 135   const aura::Window* root = window->GetRootWindow();
 136   const gfx::Point display_origin = Shell::GetScreen()->GetDisplayNearestWindow(
 137       const_cast<aura::Window*>(root)).bounds().origin();
 138   point->Offset(-display_origin.x(), -display_origin.y());
 139   aura::Window::ConvertPointToTarget(root, window, point);
 140 }
 141
 142 void ScreenPositionController::ConvertHostPointToScreen(
 143     aura::Window* root_window,
 144     gfx::Point* point) {
 145   aura::Window* root = root_window->GetRootWindow();
 146   root->GetHost()->ConvertPointFromHost(point);
 147   std::pair<aura::Window*, gfx::Point> pair =
 148       GetRootWindowRelativeToWindow(root, *point);
 149   *point = pair.second;
 150   ConvertPointToScreen(pair.first, point);
 151 }
 152
 153 void ScreenPositionController::SetBounds(aura::Window* window,
 154                                          const gfx::Rect& bounds,
 155                                          const gfx::Display& display) {
 156   DCHECK_NE(-1, display.id());
 157   if (!window->parent()->GetProperty(kUsesScreenCoordinatesKey)) {
 158     window->SetBounds(bounds);
 159     return;
 160   }
 161
 162   // Don't move a window to other root window if:
 163   // a) the window is a transient window. It moves when its
 164   //    transient_parent moves.
 165   // b) if the window or its ancestor has kStayInSameRootWindowkey. It's
 166   //    intentionally kept in the same root window even if the bounds is
 167   //    outside of the display.
 168   if (!::wm::GetTransientParent(window) &&
 169       !ShouldStayInSameRootWindow(window)) {
 170     aura::Window* dst_root =
 171         Shell::GetInstance()->display_controller()->GetRootWindowForDisplayId(
 172             display.id());
 173     DCHECK(dst_root);
 174     aura::Window* dst_container = NULL;
 175     if (dst_root != window->GetRootWindow()) {
 176       int container_id = window->parent()->id();
 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       // Set new bounds now so that the container's layout manager
 198       // can adjust the bounds if necessary.
 199       gfx::Point origin = bounds.origin();
 200       const gfx::Point display_origin = display.bounds().origin();
 201       origin.Offset(-display_origin.x(), -display_origin.y());
 202       gfx::Rect new_bounds = gfx::Rect(origin, bounds.size());
 203
 204       window->SetBounds(new_bounds);
 205
 206       dst_container->AddChild(window);
 207
 208       MoveAllTransientChildrenToNewRoot(display, window);
 209
 210       // Restore focused/active window.
 211       if (tracker.Contains(focused)) {
 212         aura::client::GetFocusClient(window)->FocusWindow(focused);
 213         // TODO(beng): replace with GetRootWindow().
 214         ash::Shell::GetInstance()->set_target_root_window(
 215             focused->GetRootWindow());
 216       } else if (tracker.Contains(active)) {
 217         activation_client->ActivateWindow(active);
 218       }
 219       // TODO(oshima): We should not have to update the bounds again
 220       // below in theory, but we currently do need as there is a code
 221       // that assumes that the bounds will never be overridden by the
 222       // layout mananger. We should have more explicit control how
 223       // constraints are applied by the layout manager.
 224     }
 225   }
 226   gfx::Point origin(bounds.origin());
 227   const gfx::Point display_origin = Shell::GetScreen()->GetDisplayNearestWindow(
 228       window).bounds().origin();
 229   origin.Offset(-display_origin.x(), -display_origin.y());
 230   window->SetBounds(gfx::Rect(origin, bounds.size()));
 231 }
 232
 233 }  // namespace ash