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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_VIEWS_CONTROLS_GLOW_HOVER_CONTROLLER_H_
#define UI_VIEWS_CONTROLS_GLOW_HOVER_CONTROLLER_H_
#include "ui/base/animation/animation_delegate.h"
#include "ui/base/animation/slide_animation.h"
#include "ui/views/views_export.h"
namespace gfx {
class Canvas;
class ImageSkia;
class Point;
}
namespace views {
class View;
// GlowHoverController is responsible for drawing a hover effect as is used by
// the tabstrip. Typical usage:
// OnMouseEntered() -> invoke Show().
// OnMouseMoved() -> invoke SetLocation().
// OnMouseExited() -> invoke Hide().
// OnPaint() -> if ShouldDraw() returns true invoke Draw().
// Internally GlowHoverController uses an animation to animate the glow and
// invokes SchedulePaint() back on the View as necessary.
class VIEWS_EXPORT GlowHoverController : public ui::AnimationDelegate {
public:
explicit GlowHoverController(views::View* view);
virtual ~GlowHoverController();
// Sets the AnimationContainer used by the animation.
void SetAnimationContainer(ui::AnimationContainer* container);
// Sets the location of the hover, relative to the View passed to the
// constructor.
void SetLocation(const gfx::Point& location);
// Initiates showing the hover.
void Show();
// Hides the hover.
void Hide();
// Hides the hover immediately.
void HideImmediately();
// Returns the value of the animation.
double GetAnimationValue() const;
// Returns true if there is something to be drawn. Use this instead of
// invoking Draw() if creating |mask_image| is expensive.
bool ShouldDraw() const;
// If the hover is currently visible it is drawn to the supplied canvas.
// |mask_image| is used to determine what parts of the canvas to draw on.
void Draw(gfx::Canvas* canvas, const gfx::ImageSkia& mask_image) const;
// ui::AnimationDelegate overrides:
virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;
virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
private:
// View we're drawing to.
views::View* view_;
// Opacity of the glow ramps up over time.
ui::SlideAnimation animation_;
// Location of the glow, relative to view.
gfx::Point location_;
DISALLOW_COPY_AND_ASSIGN(GlowHoverController);
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_GLOW_HOVER_CONTROLLER_H_
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