ash/wm/overlay_event_filter.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/overlay_event_filter.h"
   6
   7 #include "ash/wm/partial_screenshot_view.h"
   8 #include "ui/aura/window.h"
   9 #include "ui/aura/window_delegate.h"
  10 #include "ui/base/events/event.h"
  11 #include "ui/views/widget/widget.h"
  12
  13 namespace ash {
  14 namespace internal {
  15
  16 OverlayEventFilter::OverlayEventFilter()
  17     : delegate_(NULL) {
  18 }
  19
  20 OverlayEventFilter::~OverlayEventFilter() {
  21   delegate_ = NULL;
  22 }
  23
  24 void OverlayEventFilter::OnKeyEvent(ui::KeyEvent* event) {
  25   if (!delegate_)
  26     return;
  27
  28   // Do not consume a translated key event which is generated by an IME (e.g.,
  29   // ui::VKEY_PROCESSKEY) since the key event is generated in response to a key
  30   // press or release before showing the ovelay. This is important not to
  31   // confuse key event handling JavaScript code in a page.
  32   if (event->type() == ui::ET_TRANSLATED_KEY_PRESS ||
  33       event->type() == ui::ET_TRANSLATED_KEY_RELEASE) {
  34     return;
  35   }
  36
  37   if (delegate_ && delegate_->IsCancelingKeyEvent(event))
  38     Cancel();
  39
  40   // Handle key events only when they are sent to a child of the delegate's
  41   // window.
  42   aura::Window* target = static_cast<aura::Window*>(event->target());
  43   if (delegate_ && delegate_->GetWindow() &&
  44       delegate_->GetWindow()->Contains(target))
  45     target->delegate()->OnKeyEvent(event);
  46
  47   // Always handled: other windows shouldn't receive input while we're
  48   // displaying an overlay.
  49   event->StopPropagation();
  50 }
  51
  52 void OverlayEventFilter::OnLoginStateChanged(
  53     user::LoginStatus status) {
  54   Cancel();
  55 }
  56
  57 void OverlayEventFilter::OnAppTerminating() {
  58   Cancel();
  59 }
  60
  61 void OverlayEventFilter::OnLockStateChanged(bool locked) {
  62   Cancel();
  63 }
  64
  65 void OverlayEventFilter::Activate(Delegate* delegate) {
  66   delegate_ = delegate;
  67 }
  68
  69 void OverlayEventFilter::Deactivate() {
  70   delegate_ = NULL;
  71 }
  72
  73 void OverlayEventFilter::Cancel() {
  74   if (delegate_)
  75     delegate_->Cancel();
  76 }
  77 }  // namespace internal
  78 }  // namespace ash