ash/wm/capture_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/wm/capture_controller.h"
   6
   7 #include "ash/shell.h"
   8 #include "ui/aura/window.h"
   9 #include "ui/aura/root_window.h"
  10
  11 namespace ash {
  12 namespace internal {
  13
  14 ////////////////////////////////////////////////////////////////////////////////
  15 // CaptureController, public:
  16
  17 CaptureController::CaptureController()
  18     : capture_window_(NULL) {
  19 }
  20
  21 CaptureController::~CaptureController() {
  22 }
  23
  24 ////////////////////////////////////////////////////////////////////////////////
  25 // CaptureController, client::CaptureClient implementation:
  26
  27 void CaptureController::SetCapture(aura::Window* new_capture_window) {
  28   if (capture_window_ == new_capture_window)
  29     return;
  30   // Make sure window has a root window.
  31   DCHECK(!new_capture_window || new_capture_window->GetRootWindow());
  32   DCHECK(!capture_window_ || capture_window_->GetRootWindow());
  33
  34   aura::Window* old_capture_window = capture_window_;
  35   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
  36
  37   // If we're actually starting capture, then cancel any touches/gestures
  38   // that aren't already locked to the new window, and transfer any on the
  39   // old capture window to the new one.  When capture is released we have no
  40   // distinction between the touches/gestures that were in the window all
  41   // along (and so shouldn't be canceled) and those that got moved, so
  42   // just leave them all where they are.
  43   if (new_capture_window) {
  44     for (Shell::RootWindowList::iterator iter = root_windows.begin();
  45          iter != root_windows.end(); ++iter) {
  46       aura::RootWindow* root_window = *iter;
  47       root_window->gesture_recognizer()->
  48           TransferEventsTo(old_capture_window, new_capture_window);
  49     }
  50   }
  51
  52   capture_window_ = new_capture_window;
  53
  54   for (Shell::RootWindowList::iterator iter = root_windows.begin();
  55        iter != root_windows.end(); ++iter) {
  56     aura::RootWindow* root_window = *iter;
  57     root_window->UpdateCapture(old_capture_window, new_capture_window);
  58   }
  59
  60   return;
  61 }
  62
  63 void CaptureController::ReleaseCapture(aura::Window* window) {
  64   if (capture_window_ != window)
  65     return;
  66   SetCapture(NULL);
  67 }
  68
  69 aura::Window* CaptureController::GetCaptureWindow() {
  70   return capture_window_;
  71 }
  72
  73 }  // namespace internal
  74 }  // namespace ash