ui/wm/core/nested_accelerator_dispatcher_win.cc

   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 make_scoped_ptr(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);
  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 make_scoped_ptr(
  71       new NestedAcceleratorDispatcherWin(delegate, nested_dispatcher));
  72 }
  73
  74 }  // namespace wm