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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef ViewRegion_h
#define ViewRegion_h
#include "Units.h"
#include "nsTArray.h"
@class NSView;
namespace mozilla {
/**
* Manages a set of NSViews to cover a LayoutDeviceIntRegion.
*/
class ViewRegion {
public:
~ViewRegion();
mozilla::LayoutDeviceIntRegion Region() { return mRegion; }
/**
* Update the region.
* @param aRegion The new region.
* @param aCoordinateConverter The nsChildView to use for converting
* LayoutDeviceIntRect device pixel coordinates into Cocoa NSRect coordinates.
* @param aContainerView The view that's going to be the superview of the
* NSViews which will be created for this region.
* @param aViewCreationCallback A block that instantiates new NSViews.
* @return Whether or not the region changed.
*/
bool UpdateRegion(const mozilla::LayoutDeviceIntRegion& aRegion,
const nsChildView& aCoordinateConverter,
NSView* aContainerView,
NSView* (^aViewCreationCallback)());
/**
* Return an NSView from the region, if there is any.
*/
NSView* GetAnyView() { return mViews.Length() > 0 ? mViews[0] : nil; }
private:
mozilla::LayoutDeviceIntRegion mRegion;
nsTArray<NSView*> mViews;
};
} // namespace mozilla
#endif // ViewRegion_h
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