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/run_loop.h"
9#include "ui/base/accelerators/accelerator.h"
10#include "ui/events/event.h"
11#include "ui/events/platform/platform_event_dispatcher.h"
12#include "ui/events/platform/platform_event_source.h"
13#include "ui/events/platform/scoped_event_dispatcher.h"
14#include "ui/wm/core/accelerator_filter.h"
15#include "ui/wm/core/nested_accelerator_delegate.h"
16
17#if defined(USE_X11)
18#include <X11/Xlib.h>
19#endif
20
21namespace wm {
22
23namespace {
24
25#if defined(USE_OZONE)
26bool IsKeyEvent(const base::NativeEvent& native_event) {
27  const ui::KeyEvent* event = static_cast<const ui::KeyEvent*>(native_event);
28  return event->IsKeyEvent();
29}
30#elif defined(USE_X11)
31bool IsKeyEvent(const XEvent* xev) {
32  return xev->type == KeyPress || xev->type == KeyRelease;
33}
34#else
35#error Unknown build platform: you should have either use_ozone or use_x11.
36#endif
37
38scoped_ptr<ui::ScopedEventDispatcher> OverrideDispatcher(
39    ui::PlatformEventDispatcher* dispatcher) {
40  ui::PlatformEventSource* source = ui::PlatformEventSource::GetInstance();
41  return source ? source->OverrideDispatcher(dispatcher)
42                : scoped_ptr<ui::ScopedEventDispatcher>();
43}
44
45}  // namespace
46
47class NestedAcceleratorDispatcherLinux : public NestedAcceleratorDispatcher,
48                                         public ui::PlatformEventDispatcher {
49 public:
50  explicit NestedAcceleratorDispatcherLinux(NestedAcceleratorDelegate* delegate)
51      : NestedAcceleratorDispatcher(delegate),
52        restore_dispatcher_(OverrideDispatcher(this)) {}
53
54  virtual ~NestedAcceleratorDispatcherLinux() {}
55
56 private:
57  // AcceleratorDispatcher:
58  virtual scoped_ptr<base::RunLoop> CreateRunLoop() OVERRIDE {
59    return scoped_ptr<base::RunLoop>(new base::RunLoop());
60  }
61
62  // ui::PlatformEventDispatcher:
63  virtual bool CanDispatchEvent(const ui::PlatformEvent& event) OVERRIDE {
64    return true;
65  }
66
67  virtual uint32_t DispatchEvent(const ui::PlatformEvent& event) OVERRIDE {
68    if (IsKeyEvent(event)) {
69      ui::KeyEvent key_event(event);
70      ui::Accelerator accelerator = CreateAcceleratorFromKeyEvent(key_event);
71
72      switch (delegate_->ProcessAccelerator(accelerator)) {
73        case NestedAcceleratorDelegate::RESULT_PROCESS_LATER:
74#if defined(USE_X11)
75          XPutBackEvent(event->xany.display, event);
76#else
77          NOTIMPLEMENTED();
78#endif
79          return ui::POST_DISPATCH_NONE;
80        case NestedAcceleratorDelegate::RESULT_PROCESSED:
81          return ui::POST_DISPATCH_NONE;
82        case NestedAcceleratorDelegate::RESULT_NOT_PROCESSED:
83          break;
84      }
85    }
86    ui::PlatformEventDispatcher* prev = *restore_dispatcher_;
87
88    return prev ? prev->DispatchEvent(event)
89                : ui::POST_DISPATCH_PERFORM_DEFAULT;
90  }
91
92  scoped_ptr<ui::ScopedEventDispatcher> restore_dispatcher_;
93
94  DISALLOW_COPY_AND_ASSIGN(NestedAcceleratorDispatcherLinux);
95};
96
97scoped_ptr<NestedAcceleratorDispatcher> NestedAcceleratorDispatcher::Create(
98    NestedAcceleratorDelegate* delegate,
99    base::MessagePumpDispatcher* nested_dispatcher) {
100  return scoped_ptr<NestedAcceleratorDispatcher>(
101      new NestedAcceleratorDispatcherLinux(delegate));
102}
103
104}  // namespace wm
105