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      1 // Copyright 2014 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 "ui/wm/core/nested_accelerator_dispatcher.h"
      6 
      7 #include "base/memory/scoped_ptr.h"
      8 #include "base/message_loop/message_pump_dispatcher.h"
      9 #include "base/run_loop.h"
     10 #include "ui/base/accelerators/accelerator.h"
     11 #include "ui/events/event.h"
     12 #include "ui/wm/core/accelerator_filter.h"
     13 #include "ui/wm/core/nested_accelerator_delegate.h"
     14 
     15 using base::MessagePumpDispatcher;
     16 
     17 namespace wm {
     18 
     19 namespace {
     20 
     21 bool IsKeyEvent(const MSG& msg) {
     22   return msg.message == WM_KEYDOWN || msg.message == WM_SYSKEYDOWN ||
     23          msg.message == WM_KEYUP || msg.message == WM_SYSKEYUP;
     24 }
     25 
     26 }  // namespace
     27 
     28 class NestedAcceleratorDispatcherWin : public NestedAcceleratorDispatcher,
     29                                        public MessagePumpDispatcher {
     30  public:
     31   NestedAcceleratorDispatcherWin(NestedAcceleratorDelegate* delegate,
     32                                  MessagePumpDispatcher* nested)
     33       : NestedAcceleratorDispatcher(delegate), nested_dispatcher_(nested) {}
     34   virtual ~NestedAcceleratorDispatcherWin() {}
     35 
     36  private:
     37   // NestedAcceleratorDispatcher:
     38   virtual scoped_ptr<base::RunLoop> CreateRunLoop() OVERRIDE {
     39     return scoped_ptr<base::RunLoop>(new base::RunLoop(this));
     40   }
     41 
     42   // MessagePumpDispatcher:
     43   virtual uint32_t Dispatch(const MSG& event) OVERRIDE {
     44     if (IsKeyEvent(event)) {
     45       ui::KeyEvent key_event(event, false);
     46       ui::Accelerator accelerator = CreateAcceleratorFromKeyEvent(key_event);
     47 
     48       switch (delegate_->ProcessAccelerator(accelerator)) {
     49         case NestedAcceleratorDelegate::RESULT_PROCESS_LATER:
     50           return POST_DISPATCH_QUIT_LOOP;
     51         case NestedAcceleratorDelegate::RESULT_PROCESSED:
     52           return POST_DISPATCH_NONE;
     53         case NestedAcceleratorDelegate::RESULT_NOT_PROCESSED:
     54           break;
     55       }
     56     }
     57 
     58     return nested_dispatcher_ ? nested_dispatcher_->Dispatch(event)
     59                               : POST_DISPATCH_PERFORM_DEFAULT;
     60   }
     61 
     62   MessagePumpDispatcher* nested_dispatcher_;
     63 
     64   DISALLOW_COPY_AND_ASSIGN(NestedAcceleratorDispatcherWin);
     65 };
     66 
     67 scoped_ptr<NestedAcceleratorDispatcher> NestedAcceleratorDispatcher::Create(
     68     NestedAcceleratorDelegate* delegate,
     69     MessagePumpDispatcher* nested_dispatcher) {
     70   return scoped_ptr<NestedAcceleratorDispatcher>(
     71       new NestedAcceleratorDispatcherWin(delegate, nested_dispatcher));
     72 }
     73 
     74 }  // namespace wm
     75