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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/mouse_watcher.h"
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/event_types.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "ui/events/event_constants.h"
#include "ui/events/event_utils.h"
#include "ui/gfx/screen.h"
#if defined(USE_AURA)
#include "ui/aura/env.h"
#include "ui/aura/window.h"
#include "ui/events/event.h"
#include "ui/events/event_handler.h"
#endif
namespace views {
// Amount of time between when the mouse moves outside the Host's zone and when
// the listener is notified.
const int kNotifyListenerTimeMs = 300;
#if defined(OS_WIN) && !defined(USE_AURA)
class MouseWatcher::Observer : public base::MessageLoopForUI::Observer {
public:
explicit Observer(MouseWatcher* mouse_watcher)
: mouse_watcher_(mouse_watcher),
notify_listener_factory_(this) {
base::MessageLoopForUI::current()->AddObserver(this);
}
virtual ~Observer() {
base::MessageLoopForUI::current()->RemoveObserver(this);
}
// MessageLoop::Observer implementation:
virtual base::EventStatus WillProcessEvent(
const base::NativeEvent& event) OVERRIDE {
return base::EVENT_CONTINUE;
}
virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE {
// We spy on three different Windows messages here to see if the mouse has
// moved out of the bounds of the current view. The messages are:
//
// WM_MOUSEMOVE:
// For when the mouse moves from the view into the rest of the browser UI,
// i.e. within the bounds of the same windows HWND.
// WM_MOUSELEAVE:
// For when the mouse moves out of the bounds of the view's HWND.
// WM_NCMOUSELEAVE:
// For notification when the mouse leaves the _non-client_ area.
//
switch (event.message) {
case WM_MOUSEMOVE:
HandleGlobalMouseMoveEvent(MouseWatcherHost::MOUSE_MOVE);
break;
case WM_MOUSELEAVE:
case WM_NCMOUSELEAVE:
HandleGlobalMouseMoveEvent(MouseWatcherHost::MOUSE_EXIT);
break;
}
}
private:
MouseWatcherHost* host() const { return mouse_watcher_->host_.get(); }
// Called from the message loop observer when a mouse movement has occurred.
void HandleGlobalMouseMoveEvent(MouseWatcherHost::MouseEventType event_type) {
bool contained = host()->Contains(
// TODO(scottmg): Native is wrong http://crbug.com/133312
gfx::Screen::GetNativeScreen()->GetCursorScreenPoint(),
event_type);
if (!contained) {
// Mouse moved outside the host's zone, start a timer to notify the
// listener.
if (!notify_listener_factory_.HasWeakPtrs()) {
base::MessageLoop::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&Observer::NotifyListener,
notify_listener_factory_.GetWeakPtr()),
event_type == MouseWatcherHost::MOUSE_MOVE
? base::TimeDelta::FromMilliseconds(kNotifyListenerTimeMs)
: mouse_watcher_->notify_on_exit_time_);
}
} else {
// Mouse moved quickly out of the host and then into it again, so cancel
// the timer.
notify_listener_factory_.InvalidateWeakPtrs();
}
}
void NotifyListener() {
mouse_watcher_->NotifyListener();
// WARNING: we've been deleted.
}
private:
MouseWatcher* mouse_watcher_;
// A factory that is used to construct a delayed callback to the listener.
base::WeakPtrFactory<Observer> notify_listener_factory_;
DISALLOW_COPY_AND_ASSIGN(Observer);
};
#else
class MouseWatcher::Observer : public ui::EventHandler {
public:
explicit Observer(MouseWatcher* mouse_watcher)
: mouse_watcher_(mouse_watcher),
notify_listener_factory_(this) {
aura::Env::GetInstance()->AddPreTargetHandler(this);
}
virtual ~Observer() {
aura::Env::GetInstance()->RemovePreTargetHandler(this);
}
// ui::EventHandler implementation:
virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE {
switch (event->type()) {
case ui::ET_MOUSE_MOVED:
case ui::ET_MOUSE_DRAGGED:
HandleMouseEvent(MouseWatcherHost::MOUSE_MOVE);
break;
case ui::ET_MOUSE_EXITED:
HandleMouseEvent(MouseWatcherHost::MOUSE_EXIT);
break;
default:
break;
}
}
private:
MouseWatcherHost* host() const { return mouse_watcher_->host_.get(); }
// Called when a mouse event we're interested is seen.
void HandleMouseEvent(MouseWatcherHost::MouseEventType event_type) {
// It's safe to use last_mouse_location() here as this function is invoked
// during event dispatching.
if (!host()->Contains(aura::Env::GetInstance()->last_mouse_location(),
event_type)) {
// Mouse moved outside the host's zone, start a timer to notify the
// listener.
if (!notify_listener_factory_.HasWeakPtrs()) {
base::MessageLoop::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&Observer::NotifyListener,
notify_listener_factory_.GetWeakPtr()),
event_type == MouseWatcherHost::MOUSE_MOVE
? base::TimeDelta::FromMilliseconds(kNotifyListenerTimeMs)
: mouse_watcher_->notify_on_exit_time_);
}
} else {
// Mouse moved quickly out of the host and then into it again, so cancel
// the timer.
notify_listener_factory_.InvalidateWeakPtrs();
}
}
void NotifyListener() {
mouse_watcher_->NotifyListener();
// WARNING: we've been deleted.
}
private:
MouseWatcher* mouse_watcher_;
// A factory that is used to construct a delayed callback to the listener.
base::WeakPtrFactory<Observer> notify_listener_factory_;
DISALLOW_COPY_AND_ASSIGN(Observer);
};
#endif
MouseWatcherListener::~MouseWatcherListener() {
}
MouseWatcherHost::~MouseWatcherHost() {
}
MouseWatcher::MouseWatcher(MouseWatcherHost* host,
MouseWatcherListener* listener)
: host_(host),
listener_(listener),
notify_on_exit_time_(base::TimeDelta::FromMilliseconds(
kNotifyListenerTimeMs)) {
}
MouseWatcher::~MouseWatcher() {
}
void MouseWatcher::Start() {
if (!is_observing())
observer_.reset(new Observer(this));
}
void MouseWatcher::Stop() {
observer_.reset(NULL);
}
void MouseWatcher::NotifyListener() {
observer_.reset(NULL);
listener_->MouseMovedOutOfHost();
}
} // namespace views
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