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   if (delegate_ && delegate_->IsCancelingKeyEvent(event))
  27     Cancel();
  28
  29   // Pass key events only when they are sent to a child of the delegate's
  30   // window.
  31   aura::Window* target = static_cast<aura::Window*>(event->target());
  32   if (!delegate_ || !delegate_->GetWindow() ||
  33       !delegate_->GetWindow()->Contains(target))
  34     event->StopPropagation();
  35 }
  36
  37 void OverlayEventFilter::OnLoginStateChanged(
  38     user::LoginStatus status) {
  39   Cancel();
  40 }
  41
  42 void OverlayEventFilter::OnAppTerminating() {
  43   Cancel();
  44 }
  45
  46 void OverlayEventFilter::OnLockStateChanged(bool locked) {
  47   Cancel();
  48 }
  49
  50 void OverlayEventFilter::Activate(Delegate* delegate) {
  51   if (delegate_)
  52     delegate_->Cancel();
  53   delegate_ = delegate;
  54 }
  55
  56 void OverlayEventFilter::Deactivate(Delegate* delegate) {
  57   if (delegate_ == delegate)
  58     delegate_ = nullptr;
  59 }
  60
  61 void OverlayEventFilter::Cancel() {
  62   if (delegate_) {
  63     delegate_->Cancel();
  64     delegate_ = nullptr;
  65   }
  66 }
  67
  68 bool OverlayEventFilter::IsActive() {
  69   return delegate_ != nullptr;
  70 }
  71
  72 }  // namespace ash