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