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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.
#ifndef UI_MESSAGE_CENTER_VIEWS_SLIDE_OUT_CONTROLLER_H_
#define UI_MESSAGE_CENTER_VIEWS_SLIDE_OUT_CONTROLLER_H_
#include "base/macros.h"
#include "ui/compositor/layer_animation_observer.h"
#include "ui/events/scoped_target_handler.h"
#include "ui/message_center/message_center_export.h"
#include "ui/views/view.h"
namespace message_center {
// This class contains logic to control sliding out of a layer in response to
// swipes, i.e. gesture scroll events.
class MESSAGE_CENTER_EXPORT SlideOutController
: public ui::EventHandler,
public ui::ImplicitAnimationObserver {
public:
class Delegate {
public:
// Returns the layer for slide operations.
virtual ui::Layer* GetSlideOutLayer() = 0;
// Called when a slide starts, ends, or is updated.
virtual void OnSlideChanged() = 0;
// Called when user intends to close the View by sliding it out.
virtual void OnSlideOut() = 0;
};
SlideOutController(ui::EventTarget* target, Delegate* delegate);
~SlideOutController() override;
void set_enabled(bool enabled) { enabled_ = enabled; }
bool enabled() { return enabled_; }
// ui::EventHandler
void OnGestureEvent(ui::GestureEvent* event) override;
// ui::ImplicitAnimationObserver
void OnImplicitAnimationsCompleted() override;
private:
// Restores the transform and opacity of the view.
void RestoreVisualState();
// Slides the view out and closes it after the animation. The sign of
// |direction| indicates which way the slide occurs.
void SlideOutAndClose(int direction);
ui::ScopedTargetHandler target_handling_;
Delegate* delegate_;
float gesture_amount_ = 0.f;
bool enabled_ = true;
DISALLOW_COPY_AND_ASSIGN(SlideOutController);
};
} // namespace message_center
#endif // UI_MESSAGE_CENTER_VIEWS_SLIDE_OUT_CONTROLLER_H_
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