1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/generic/nsLeafFrame.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,107 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/* base class for rendering objects that do not have child lists */
1.10 +
1.11 +#ifndef nsLeafFrame_h___
1.12 +#define nsLeafFrame_h___
1.13 +
1.14 +#include "mozilla/Attributes.h"
1.15 +#include "nsFrame.h"
1.16 +#include "nsDisplayList.h"
1.17 +
1.18 +/**
1.19 + * Abstract class that provides simple fixed-size layout for leaf objects
1.20 + * (e.g. images, form elements, etc.). Deriviations provide the implementation
1.21 + * of the GetDesiredSize method. The rendering method knows how to render
1.22 + * borders and backgrounds.
1.23 + */
1.24 +class nsLeafFrame : public nsFrame {
1.25 +public:
1.26 + NS_DECL_FRAMEARENA_HELPERS
1.27 +
1.28 + // nsIFrame replacements
1.29 + virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
1.30 + const nsRect& aDirtyRect,
1.31 + const nsDisplayListSet& aLists) MOZ_OVERRIDE {
1.32 + DO_GLOBAL_REFLOW_COUNT_DSP("nsLeafFrame");
1.33 + DisplayBorderBackgroundOutline(aBuilder, aLists);
1.34 + }
1.35 +
1.36 + /**
1.37 + * Both GetMinWidth and GetPrefWidth will return whatever GetIntrinsicWidth
1.38 + * returns.
1.39 + */
1.40 + virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
1.41 + virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
1.42 +
1.43 + /**
1.44 + * Our auto size is just intrinsic width and intrinsic height.
1.45 + */
1.46 + virtual nsSize ComputeAutoSize(nsRenderingContext *aRenderingContext,
1.47 + nsSize aCBSize, nscoord aAvailableWidth,
1.48 + nsSize aMargin, nsSize aBorder,
1.49 + nsSize aPadding, bool aShrinkWrap) MOZ_OVERRIDE;
1.50 +
1.51 + /**
1.52 + * Reflow our frame. This will use the computed width plus borderpadding for
1.53 + * the desired width, and use the return value of GetIntrinsicHeight plus
1.54 + * borderpadding for the desired height. Ascent will be set to the height,
1.55 + * and descent will be set to 0.
1.56 + */
1.57 + virtual nsresult Reflow(nsPresContext* aPresContext,
1.58 + nsHTMLReflowMetrics& aDesiredSize,
1.59 + const nsHTMLReflowState& aReflowState,
1.60 + nsReflowStatus& aStatus) MOZ_OVERRIDE;
1.61 +
1.62 + /**
1.63 + * This method does most of the work that Reflow() above need done.
1.64 + */
1.65 + virtual nsresult DoReflow(nsPresContext* aPresContext,
1.66 + nsHTMLReflowMetrics& aDesiredSize,
1.67 + const nsHTMLReflowState& aReflowState,
1.68 + nsReflowStatus& aStatus);
1.69 +
1.70 + virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
1.71 + {
1.72 + // We don't actually contain a block, but we do always want a
1.73 + // computed width, so tell a little white lie here.
1.74 + return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplacedContainsBlock));
1.75 + }
1.76 +
1.77 +protected:
1.78 + nsLeafFrame(nsStyleContext* aContext) : nsFrame(aContext) {}
1.79 + virtual ~nsLeafFrame();
1.80 +
1.81 + /**
1.82 + * Return the intrinsic width of the frame's content area. Note that this
1.83 + * should not include borders or padding and should not depend on the applied
1.84 + * styles.
1.85 + */
1.86 + virtual nscoord GetIntrinsicWidth() = 0;
1.87 +
1.88 + /**
1.89 + * Return the intrinsic height of the frame's content area. This should not
1.90 + * include border or padding. This will only matter if the specified height
1.91 + * is auto. Note that subclasses must either implement this or override
1.92 + * Reflow and ComputeAutoSize; the default Reflow and ComputeAutoSize impls
1.93 + * call this method.
1.94 + */
1.95 + virtual nscoord GetIntrinsicHeight();
1.96 +
1.97 + /**
1.98 + * Subroutine to add in borders and padding
1.99 + */
1.100 + void AddBordersAndPadding(const nsHTMLReflowState& aReflowState,
1.101 + nsHTMLReflowMetrics& aDesiredSize);
1.102 +
1.103 + /**
1.104 + * Set aDesiredSize to be the available size
1.105 + */
1.106 + void SizeToAvailSize(const nsHTMLReflowState& aReflowState,
1.107 + nsHTMLReflowMetrics& aDesiredSize);
1.108 +};
1.109 +
1.110 +#endif /* nsLeafFrame_h___ */
