зеркало из https://github.com/mozilla/gecko-dev.git
54 строки
1.6 KiB
C
54 строки
1.6 KiB
C
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef ViewRegion_h
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#define ViewRegion_h
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#include "Units.h"
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#include "nsTArray.h"
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@class NSView;
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namespace mozilla {
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/**
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* Manages a set of NSViews to cover a LayoutDeviceIntRegion.
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*/
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class ViewRegion {
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public:
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~ViewRegion();
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mozilla::LayoutDeviceIntRegion Region() { return mRegion; }
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/**
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* Update the region.
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* @param aRegion The new region.
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* @param aCoordinateConverter The nsChildView to use for converting
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* LayoutDeviceIntRect device pixel coordinates into Cocoa NSRect coordinates.
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* @param aContainerView The view that's going to be the superview of the
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* NSViews which will be created for this region.
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* @param aViewCreationCallback A block that instantiates new NSViews.
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* @return Whether or not the region changed.
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*/
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bool UpdateRegion(const mozilla::LayoutDeviceIntRegion& aRegion,
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const nsChildView& aCoordinateConverter,
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NSView* aContainerView,
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NSView* (^aViewCreationCallback)());
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/**
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* Return an NSView from the region, if there is any.
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*/
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NSView* GetAnyView() { return mViews.Length() > 0 ? mViews[0] : nil; }
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private:
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mozilla::LayoutDeviceIntRegion mRegion;
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nsTArray<NSView*> mViews;
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};
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} // namespace mozilla
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#endif // ViewRegion_h
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