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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.
#ifndef CHROME_BROWSER_CHROMEOS_UI_ACCESSIBILITY_FOCUS_RING_CONTROLLER_H_
#define CHROME_BROWSER_CHROMEOS_UI_ACCESSIBILITY_FOCUS_RING_CONTROLLER_H_
#include <vector>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/time/time.h"
#include "chrome/browser/chromeos/ui/accessibility_focus_ring_layer.h"
#include "ui/compositor/compositor_animation_observer.h"
#include "ui/gfx/rect.h"
namespace ui {
class Compositor;
}
namespace chromeos {
// AccessibilityFocusRingController manages a custom focus ring (or multiple
// rings) for accessibility.
class AccessibilityFocusRingController
: public FocusRingLayerDelegate,
public ui::CompositorAnimationObserver {
public:
// Get the single instance of this class.
static AccessibilityFocusRingController* GetInstance();
// Draw a focus ring around the given set of rects, in global screen
// coordinates.
void SetFocusRing(const std::vector<gfx::Rect>& rects);
protected:
AccessibilityFocusRingController();
virtual ~AccessibilityFocusRingController();
// Given an unordered vector of bounding rectangles that cover everything
// that currently has focus, populate a vector of one or more
// AccessibilityFocusRings that surround the rectangles. Adjacent or
// overlapping rectangles are combined first. This function is protected
// so it can be unit-tested.
void RectsToRings(const std::vector<gfx::Rect>& rects,
std::vector<AccessibilityFocusRing>* rings) const;
virtual int GetMargin() const;
private:
// FocusRingLayerDelegate.
virtual void OnDeviceScaleFactorChanged() override;
// CompositorAnimationObserver.
virtual void OnAnimationStep(base::TimeTicks timestamp) override;
void Update();
AccessibilityFocusRing RingFromSortedRects(
const std::vector<gfx::Rect>& rects) const;
void SplitIntoParagraphShape(
const std::vector<gfx::Rect>& rects,
gfx::Rect* top,
gfx::Rect* middle,
gfx::Rect* bottom) const;
bool Intersects(const gfx::Rect& r1, const gfx::Rect& r2) const;
std::vector<gfx::Rect> rects_;
std::vector<AccessibilityFocusRing> previous_rings_;
std::vector<AccessibilityFocusRing> rings_;
std::vector<scoped_ptr<AccessibilityFocusRingLayer> > layers_;
base::TimeTicks focus_change_time_;
ui::Compositor* compositor_;
friend struct DefaultSingletonTraits<AccessibilityFocusRingController>;
DISALLOW_COPY_AND_ASSIGN(AccessibilityFocusRingController);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_UI_ACCESSIBILITY_FOCUS_RING_CONTROLLER_H_
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