зеркало из https://github.com/mozilla/gecko-dev.git
99 строки
3.4 KiB
C++
99 строки
3.4 KiB
C++
/* -*- 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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/* base class for rendering objects that do not have child lists */
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#ifndef nsLeafFrame_h___
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#define nsLeafFrame_h___
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#include "mozilla/Attributes.h"
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#include "nsFrame.h"
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#include "nsDisplayList.h"
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/**
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* Abstract class that provides simple fixed-size layout for leaf objects
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* (e.g. images, form elements, etc.). Deriviations provide the implementation
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* of the GetDesiredSize method. The rendering method knows how to render
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* borders and backgrounds.
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*/
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class nsLeafFrame : public nsFrame {
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public:
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NS_DECL_ABSTRACT_FRAME(nsLeafFrame)
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// nsIFrame replacements
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virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) override {
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DO_GLOBAL_REFLOW_COUNT_DSP("nsLeafFrame");
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DisplayBorderBackgroundOutline(aBuilder, aLists);
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}
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/**
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* Both GetMinISize and GetPrefISize will return whatever GetIntrinsicISize
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* returns.
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*/
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virtual nscoord GetMinISize(gfxContext *aRenderingContext) override;
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virtual nscoord GetPrefISize(gfxContext *aRenderingContext) override;
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/**
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* Our auto size is just intrinsic width and intrinsic height.
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*/
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virtual mozilla::LogicalSize
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ComputeAutoSize(gfxContext* aRenderingContext,
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mozilla::WritingMode aWM,
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const mozilla::LogicalSize& aCBSize,
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nscoord aAvailableISize,
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const mozilla::LogicalSize& aMargin,
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const mozilla::LogicalSize& aBorder,
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const mozilla::LogicalSize& aPadding,
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ComputeSizeFlags aFlags) override;
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/**
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* Each of our subclasses should provide its own Reflow impl:
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*/
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virtual void Reflow(nsPresContext* aPresContext,
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ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) override = 0;
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virtual bool IsFrameOfType(uint32_t aFlags) const override
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{
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// We don't actually contain a block, but we do always want a
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// computed width, so tell a little white lie here.
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return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplacedContainsBlock));
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}
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protected:
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nsLeafFrame(ComputedStyle* aStyle, ClassID aID)
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: nsFrame(aStyle, aID)
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{}
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virtual ~nsLeafFrame();
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/**
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* Return the intrinsic isize of the frame's content area. Note that this
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* should not include borders or padding and should not depend on the applied
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* styles.
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*/
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virtual nscoord GetIntrinsicISize() = 0;
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/**
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* Return the intrinsic bsize of the frame's content area. This should not
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* include border or padding. This will only matter if the specified bsize
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* is auto. Note that subclasses must either implement this or override
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* Reflow and ComputeAutoSize; the default Reflow and ComputeAutoSize impls
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* call this method.
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*/
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virtual nscoord GetIntrinsicBSize();
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/**
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* Set aDesiredSize to be the available size
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*/
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void SizeToAvailSize(const ReflowInput& aReflowInput,
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ReflowOutput& aDesiredSize);
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};
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#endif /* nsLeafFrame_h___ */
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