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// Copyright (c) 2011 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_UI_PANELS_AUTO_HIDING_DESKTOP_BAR_H_
#define CHROME_BROWSER_UI_PANELS_AUTO_HIDING_DESKTOP_BAR_H_
#pragma once
#include "base/memory/ref_counted.h"
namespace gfx {
class Rect;
}
// Encapsulates the logic to deal with always-on-top auto-hiding desktop bars,
// like Windows taskbar or MacOSX dock.
// Note that the ref count is needed by using PostTask in the implementation of
// MockAutoHidingDesktopBar that derives from AutoHidingDesktopBar.
class AutoHidingDesktopBar : public base::RefCounted<AutoHidingDesktopBar> {
public:
// Indicates which screen edge the desktop bar is aligned to.
// We do not care about the desktop aligned to the top screen edge.
enum Alignment {
ALIGN_BOTTOM = 0,
ALIGN_LEFT = 1,
ALIGN_RIGHT = 2
};
enum Visibility {
VISIBLE,
ANIMATING,
HIDDEN
};
// Observer can listen to various events regarding the desktop bar changes.
class Observer {
public:
// Called when any of the desktop bars get their thickness changed.
// Note that if an auto-hiding desktop bar is moved from one edge
// to another edge, it will cause thickness changes to both edges.
virtual void OnAutoHidingDesktopBarThicknessChanged() = 0;
// Called when an auto-hiding desktop bar has its visibility changed.
virtual void OnAutoHidingDesktopBarVisibilityChanged(
Alignment alignment, Visibility visibility) = 0;
};
static AutoHidingDesktopBar* Create(Observer* observer);
virtual ~AutoHidingDesktopBar() { }
// This should be called each time when the work area is changed. We only
// care about the desktop bars that sit on the screen that hosts the specified
// work area.
virtual void UpdateWorkArea(const gfx::Rect& work_area) = 0;
// Returns true if there is a desktop bar that is aligned to the specified
// screen edge and set to auto-hide.
virtual bool IsEnabled(Alignment alignment) = 0;
// Returns the thickness of the desktop bar that is aligned to the specified
// screen edge, when it is visible. When the desktop bar is aligned to bottom
// edge, this is the height of the bar. If the desktop bar is aligned to
// left or right edge, this is the width of the bar.
virtual int GetThickness(Alignment alignment) const = 0;
// Returns the visibility state of the desktop bar that is aligned to the
// specified screen edge.
virtual Visibility GetVisibility(Alignment alignment) const = 0;
};
#endif // CHROME_BROWSER_UI_PANELS_AUTO_HIDING_DESKTOP_BAR_H_
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