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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 CHROME_BROWSER_UI_PANELS_DISPLAY_SETTINGS_PROVIDER_H_
#define CHROME_BROWSER_UI_PANELS_DISPLAY_SETTINGS_PROVIDER_H_
#pragma once
#include "ui/gfx/rect.h"
// Encapsulates the logic to provide display settings support, including the
// information for:
// 1) Work area
// 2) Auto-hiding desktop bars, like Windows taskbar and MacOSX dock.
class DisplaySettingsProvider {
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 DesktopBarAlignment {
DESKTOP_BAR_ALIGNED_BOTTOM = 0,
DESKTOP_BAR_ALIGNED_LEFT = 1,
DESKTOP_BAR_ALIGNED_RIGHT = 2
};
// Indicates current visibility state of the desktop bar.
enum DesktopBarVisibility {
DESKTOP_BAR_VISIBLE,
DESKTOP_BAR_ANIMATING,
DESKTOP_BAR_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(
DesktopBarAlignment alignment, DesktopBarVisibility visibility) = 0;
};
static DisplaySettingsProvider* Create(Observer* observer);
virtual ~DisplaySettingsProvider();
// Returns the bounds of the work area.
virtual gfx::Rect GetWorkArea();
// Returns true if there is a desktop bar that is aligned to the specified
// screen edge and set to auto-hide.
virtual bool IsAutoHidingDesktopBarEnabled(DesktopBarAlignment alignment);
// 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 GetDesktopBarThickness(DesktopBarAlignment alignment) const;
// Returns the visibility state of the desktop bar that is aligned to the
// specified screen edge.
virtual DesktopBarVisibility GetDesktopBarVisibility(
DesktopBarAlignment alignment) const;
#ifdef UNIT_TEST
void set_work_area(const gfx::Rect& work_area) {
work_area_ = work_area;
}
#endif
protected:
explicit DisplaySettingsProvider(Observer* observer);
// Invoked when the work area is changed in order to update the information
// about the desktop bars. We only care about the desktop bars that sit on
// the screen that hosts the specified work area.
virtual void OnWorkAreaChanged();
Observer* observer_;
gfx::Rect work_area_;
};
#endif // CHROME_BROWSER_UI_PANELS_DISPLAY_SETTINGS_PROVIDER_H_
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