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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/views/mouse_watcher.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/compiler_specific.h" | |
| 9 #include "base/event_types.h" | |
| 10 #include "base/memory/weak_ptr.h" | |
| 11 #include "base/message_loop/message_loop.h" | |
| 12 #include "ui/aura/env.h" | |
| 13 #include "ui/aura/window.h" | |
| 14 #include "ui/events/event.h" | |
| 15 #include "ui/events/event_constants.h" | |
| 16 #include "ui/events/event_handler.h" | |
| 17 #include "ui/events/event_utils.h" | |
| 18 #include "ui/gfx/screen.h" | |
| 19 | |
| 20 namespace views { | |
| 21 | |
| 22 // Amount of time between when the mouse moves outside the Host's zone and when | |
| 23 // the listener is notified. | |
| 24 const int kNotifyListenerTimeMs = 300; | |
| 25 | |
| 26 class MouseWatcher::Observer : public ui::EventHandler { | |
| 27 public: | |
| 28 explicit Observer(MouseWatcher* mouse_watcher) | |
| 29 : mouse_watcher_(mouse_watcher), | |
| 30 notify_listener_factory_(this) { | |
| 31 aura::Env::GetInstance()->AddPreTargetHandler(this); | |
| 32 } | |
| 33 | |
| 34 virtual ~Observer() { | |
| 35 aura::Env::GetInstance()->RemovePreTargetHandler(this); | |
| 36 } | |
| 37 | |
| 38 // ui::EventHandler implementation: | |
| 39 virtual void OnMouseEvent(ui::MouseEvent* event) override { | |
| 40 switch (event->type()) { | |
| 41 case ui::ET_MOUSE_MOVED: | |
| 42 case ui::ET_MOUSE_DRAGGED: | |
| 43 HandleMouseEvent(MouseWatcherHost::MOUSE_MOVE); | |
| 44 break; | |
| 45 case ui::ET_MOUSE_EXITED: | |
| 46 HandleMouseEvent(MouseWatcherHost::MOUSE_EXIT); | |
| 47 break; | |
| 48 default: | |
| 49 break; | |
| 50 } | |
| 51 } | |
| 52 | |
| 53 private: | |
| 54 MouseWatcherHost* host() const { return mouse_watcher_->host_.get(); } | |
| 55 | |
| 56 // Called when a mouse event we're interested is seen. | |
| 57 void HandleMouseEvent(MouseWatcherHost::MouseEventType event_type) { | |
| 58 // It's safe to use last_mouse_location() here as this function is invoked | |
| 59 // during event dispatching. | |
| 60 if (!host()->Contains(aura::Env::GetInstance()->last_mouse_location(), | |
| 61 event_type)) { | |
| 62 // Mouse moved outside the host's zone, start a timer to notify the | |
| 63 // listener. | |
| 64 if (!notify_listener_factory_.HasWeakPtrs()) { | |
| 65 base::MessageLoop::current()->PostDelayedTask( | |
| 66 FROM_HERE, | |
| 67 base::Bind(&Observer::NotifyListener, | |
| 68 notify_listener_factory_.GetWeakPtr()), | |
| 69 event_type == MouseWatcherHost::MOUSE_MOVE | |
| 70 ? base::TimeDelta::FromMilliseconds(kNotifyListenerTimeMs) | |
| 71 : mouse_watcher_->notify_on_exit_time_); | |
| 72 } | |
| 73 } else { | |
| 74 // Mouse moved quickly out of the host and then into it again, so cancel | |
| 75 // the timer. | |
| 76 notify_listener_factory_.InvalidateWeakPtrs(); | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 void NotifyListener() { | |
| 81 mouse_watcher_->NotifyListener(); | |
| 82 // WARNING: we've been deleted. | |
| 83 } | |
| 84 | |
| 85 private: | |
| 86 MouseWatcher* mouse_watcher_; | |
| 87 | |
| 88 // A factory that is used to construct a delayed callback to the listener. | |
| 89 base::WeakPtrFactory<Observer> notify_listener_factory_; | |
| 90 | |
| 91 DISALLOW_COPY_AND_ASSIGN(Observer); | |
| 92 }; | |
| 93 | |
| 94 MouseWatcherListener::~MouseWatcherListener() { | |
| 95 } | |
| 96 | |
| 97 MouseWatcherHost::~MouseWatcherHost() { | |
| 98 } | |
| 99 | |
| 100 MouseWatcher::MouseWatcher(MouseWatcherHost* host, | |
| 101 MouseWatcherListener* listener) | |
| 102 : host_(host), | |
| 103 listener_(listener), | |
| 104 notify_on_exit_time_(base::TimeDelta::FromMilliseconds( | |
| 105 kNotifyListenerTimeMs)) { | |
| 106 } | |
| 107 | |
| 108 MouseWatcher::~MouseWatcher() { | |
| 109 } | |
| 110 | |
| 111 void MouseWatcher::Start() { | |
| 112 if (!is_observing()) | |
| 113 observer_.reset(new Observer(this)); | |
| 114 } | |
| 115 | |
| 116 void MouseWatcher::Stop() { | |
| 117 observer_.reset(NULL); | |
| 118 } | |
| 119 | |
| 120 void MouseWatcher::NotifyListener() { | |
| 121 observer_.reset(NULL); | |
| 122 listener_->MouseMovedOutOfHost(); | |
| 123 } | |
| 124 | |
| 125 } // namespace views | |
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