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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/event_monitor_aura.h"
#include <memory>
#include "base/logging.h"
#include "base/scoped_observer.h"
#include "ui/aura/env.h"
#include "ui/aura/window.h"
#include "ui/events/event_observer.h"
#include "ui/events/event_target.h"
namespace views {
namespace {
// An EventMonitorAura that removes its event observer on window destruction.
class WindowMonitorAura : public EventMonitorAura, public aura::WindowObserver {
public:
WindowMonitorAura(aura::Env* env,
ui::EventObserver* event_observer,
aura::Window* target_window,
const std::set<ui::EventType>& types)
: EventMonitorAura(env, event_observer, target_window, types),
target_window_(target_window) {
window_observer_.Add(target_window);
}
~WindowMonitorAura() override = default;
// aura::WindowObserver:
void OnWindowDestroying(aura::Window* window) override {
DCHECK_EQ(window, target_window_);
window_observer_.Remove(target_window_);
target_window_ = nullptr;
TearDown();
}
private:
aura::Window* target_window_;
ScopedObserver<aura::Window, aura::WindowObserver> window_observer_{this};
DISALLOW_COPY_AND_ASSIGN(WindowMonitorAura);
};
} // namespace
// static
std::unique_ptr<EventMonitor> EventMonitor::CreateApplicationMonitor(
ui::EventObserver* event_observer,
gfx::NativeWindow context,
const std::set<ui::EventType>& types) {
aura::Env* env = context->env();
return std::make_unique<EventMonitorAura>(env, event_observer, env, types);
}
// static
std::unique_ptr<EventMonitor> EventMonitor::CreateWindowMonitor(
ui::EventObserver* event_observer,
gfx::NativeWindow target_window,
const std::set<ui::EventType>& types) {
return std::make_unique<WindowMonitorAura>(
target_window->env(), event_observer, target_window, types);
}
EventMonitorAura::EventMonitorAura(aura::Env* env,
ui::EventObserver* event_observer,
ui::EventTarget* event_target,
const std::set<ui::EventType>& types)
: env_(env), event_observer_(event_observer), event_target_(event_target) {
DCHECK(env_);
DCHECK(event_observer_);
DCHECK(event_target_);
env_->AddEventObserver(event_observer_, event_target, types);
}
EventMonitorAura::~EventMonitorAura() {
TearDown();
}
gfx::Point EventMonitorAura::GetLastMouseLocation() {
return env_->last_mouse_location();
}
void EventMonitorAura::TearDown() {
if (event_observer_)
env_->RemoveEventObserver(event_observer_);
event_observer_ = nullptr;
}
} // namespace views
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