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97 lines
2.5 KiB
C++
97 lines
2.5 KiB
C++
/*-*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef NSDISPLAYLISTINVALIDATION_H_
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#define NSDISPLAYLISTINVALIDATION_H_
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#include "nsRect.h"
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class nsDisplayItem;
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class nsDisplayListBuilder;
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class nsDisplayBackgroundImage;
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/**
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* This stores the geometry of an nsDisplayItem, and the area
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* that will be affected when painting the item.
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*
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* It is used to retain information about display items so they
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* can be compared against new display items in the next paint.
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*/
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class nsDisplayItemGeometry
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{
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public:
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nsDisplayItemGeometry(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder);
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virtual ~nsDisplayItemGeometry();
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/**
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* Compute the area required to be invalidated if this
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* display item is removed.
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*/
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const nsRect& ComputeInvalidationRegion() { return mBounds; }
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/**
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* Shifts all retained areas of the nsDisplayItemGeometry by the given offset.
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*
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* This is used to compensate for scrolling, since the destination buffer
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* can scroll without requiring a full repaint.
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*
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* @param aOffset Offset to shift by.
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*/
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virtual void MoveBy(const nsPoint& aOffset) = 0;
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/**
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* Bounds of the display item
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*/
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nsRect mBounds;
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};
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/**
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* A default geometry implementation, used by nsDisplayItem. Retains
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* and compares the bounds, and border rect.
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*
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* This should be sufficient for the majority of display items.
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*/
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class nsDisplayItemGenericGeometry : public nsDisplayItemGeometry
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{
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public:
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nsDisplayItemGenericGeometry(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder);
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virtual void MoveBy(const nsPoint& aOffset);
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nsRect mBorderRect;
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};
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class nsDisplayBorderGeometry : public nsDisplayItemGeometry
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{
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public:
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nsDisplayBorderGeometry(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder);
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virtual void MoveBy(const nsPoint& aOffset);
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nsRect mContentRect;
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};
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class nsDisplayBackgroundGeometry : public nsDisplayItemGeometry
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{
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public:
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nsDisplayBackgroundGeometry(nsDisplayBackgroundImage* aItem, nsDisplayListBuilder* aBuilder);
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virtual void MoveBy(const nsPoint& aOffset);
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nsRect mPositioningArea;
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};
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class nsDisplayBoxShadowInnerGeometry : public nsDisplayItemGeometry
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{
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public:
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nsDisplayBoxShadowInnerGeometry(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder);
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virtual void MoveBy(const nsPoint& aOffset);
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nsRect mPaddingRect;
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};
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#endif /*NSDISPLAYLISTINVALIDATION_H_*/
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