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