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      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
     79