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// Copyright 2014 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/location.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "ui/events/event.h"
#include "ui/events/event_constants.h"
#include "ui/events/event_observer.h"
#include "ui/events/event_utils.h"
#include "ui/events/platform_event.h"
#include "ui/views/event_monitor.h"
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;
class MouseWatcher::Observer : public ui::EventObserver {
public:
Observer(MouseWatcher* mouse_watcher, gfx::NativeWindow window)
: mouse_watcher_(mouse_watcher), notify_listener_factory_(this) {
event_monitor_ = EventMonitor::CreateApplicationMonitor(
this, window,
{ui::ET_MOUSE_PRESSED, ui::ET_MOUSE_MOVED, ui::ET_MOUSE_EXITED,
ui::ET_MOUSE_DRAGGED});
}
// ui::EventObserver:
void OnEvent(const ui::Event& 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;
case ui::ET_MOUSE_PRESSED:
HandleMouseEvent(MouseWatcherHost::MOUSE_PRESS);
break;
default:
NOTREACHED();
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(event_monitor_->GetLastMouseLocation(), event_type)) {
if (event_type == MouseWatcherHost::MOUSE_PRESS) {
NotifyListener();
} else if (!notify_listener_factory_.HasWeakPtrs()) {
// Mouse moved outside the host's zone, start a timer to notify the
// listener.
base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
FROM_HERE,
base::BindOnce(&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_;
std::unique_ptr<views::EventMonitor> event_monitor_;
// A factory that is used to construct a delayed callback to the listener.
base::WeakPtrFactory<Observer> notify_listener_factory_;
DISALLOW_COPY_AND_ASSIGN(Observer);
};
MouseWatcherListener::~MouseWatcherListener() = default;
MouseWatcherHost::~MouseWatcherHost() = default;
MouseWatcher::MouseWatcher(std::unique_ptr<MouseWatcherHost> host,
MouseWatcherListener* listener)
: host_(std::move(host)),
listener_(listener),
notify_on_exit_time_(
base::TimeDelta::FromMilliseconds(kNotifyListenerTimeMs)) {}
MouseWatcher::~MouseWatcher() = default;
void MouseWatcher::Start(gfx::NativeWindow window) {
if (!is_observing())
observer_ = std::make_unique<Observer>(this, window);
}
void MouseWatcher::Stop() {
observer_.reset();
}
void MouseWatcher::NotifyListener() {
observer_.reset();
listener_->MouseMovedOutOfHost();
}
} // namespace views
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