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comparison: layout/generic/nsLeafFrame.h
layout/generic/nsLeafFrame.h
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* base class for rendering objects that do not have child lists */ | |
| 7 | |
| 8 #ifndef nsLeafFrame_h___ | |
| 9 #define nsLeafFrame_h___ | |
| 10 | |
| 11 #include "mozilla/Attributes.h" | |
| 12 #include "nsFrame.h" | |
| 13 #include "nsDisplayList.h" | |
| 14 | |
| 15 /** | |
| 16 * Abstract class that provides simple fixed-size layout for leaf objects | |
| 17 * (e.g. images, form elements, etc.). Deriviations provide the implementation | |
| 18 * of the GetDesiredSize method. The rendering method knows how to render | |
| 19 * borders and backgrounds. | |
| 20 */ | |
| 21 class nsLeafFrame : public nsFrame { | |
| 22 public: | |
| 23 NS_DECL_FRAMEARENA_HELPERS | |
| 24 | |
| 25 // nsIFrame replacements | |
| 26 virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder, | |
| 27 const nsRect& aDirtyRect, | |
| 28 const nsDisplayListSet& aLists) MOZ_OVERRIDE { | |
| 29 DO_GLOBAL_REFLOW_COUNT_DSP("nsLeafFrame"); | |
| 30 DisplayBorderBackgroundOutline(aBuilder, aLists); | |
| 31 } | |
| 32 | |
| 33 /** | |
| 34 * Both GetMinWidth and GetPrefWidth will return whatever GetIntrinsicWidth | |
| 35 * returns. | |
| 36 */ | |
| 37 virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE; | |
| 38 virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE; | |
| 39 | |
| 40 /** | |
| 41 * Our auto size is just intrinsic width and intrinsic height. | |
| 42 */ | |
| 43 virtual nsSize ComputeAutoSize(nsRenderingContext *aRenderingContext, | |
| 44 nsSize aCBSize, nscoord aAvailableWidth, | |
| 45 nsSize aMargin, nsSize aBorder, | |
| 46 nsSize aPadding, bool aShrinkWrap) MOZ_OVERRIDE; | |
| 47 | |
| 48 /** | |
| 49 * Reflow our frame. This will use the computed width plus borderpadding for | |
| 50 * the desired width, and use the return value of GetIntrinsicHeight plus | |
| 51 * borderpadding for the desired height. Ascent will be set to the height, | |
| 52 * and descent will be set to 0. | |
| 53 */ | |
| 54 virtual nsresult Reflow(nsPresContext* aPresContext, | |
| 55 nsHTMLReflowMetrics& aDesiredSize, | |
| 56 const nsHTMLReflowState& aReflowState, | |
| 57 nsReflowStatus& aStatus) MOZ_OVERRIDE; | |
| 58 | |
| 59 /** | |
| 60 * This method does most of the work that Reflow() above need done. | |
| 61 */ | |
| 62 virtual nsresult DoReflow(nsPresContext* aPresContext, | |
| 63 nsHTMLReflowMetrics& aDesiredSize, | |
| 64 const nsHTMLReflowState& aReflowState, | |
| 65 nsReflowStatus& aStatus); | |
| 66 | |
| 67 virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE | |
| 68 { | |
| 69 // We don't actually contain a block, but we do always want a | |
| 70 // computed width, so tell a little white lie here. | |
| 71 return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplacedContainsBlock)); | |
| 72 } | |
| 73 | |
| 74 protected: | |
| 75 nsLeafFrame(nsStyleContext* aContext) : nsFrame(aContext) {} | |
| 76 virtual ~nsLeafFrame(); | |
| 77 | |
| 78 /** | |
| 79 * Return the intrinsic width of the frame's content area. Note that this | |
| 80 * should not include borders or padding and should not depend on the applied | |
| 81 * styles. | |
| 82 */ | |
| 83 virtual nscoord GetIntrinsicWidth() = 0; | |
| 84 | |
| 85 /** | |
| 86 * Return the intrinsic height of the frame's content area. This should not | |
| 87 * include border or padding. This will only matter if the specified height | |
| 88 * is auto. Note that subclasses must either implement this or override | |
| 89 * Reflow and ComputeAutoSize; the default Reflow and ComputeAutoSize impls | |
| 90 * call this method. | |
| 91 */ | |
| 92 virtual nscoord GetIntrinsicHeight(); | |
| 93 | |
| 94 /** | |
| 95 * Subroutine to add in borders and padding | |
| 96 */ | |
| 97 void AddBordersAndPadding(const nsHTMLReflowState& aReflowState, | |
| 98 nsHTMLReflowMetrics& aDesiredSize); | |
| 99 | |
| 100 /** | |
| 101 * Set aDesiredSize to be the available size | |
| 102 */ | |
| 103 void SizeToAvailSize(const nsHTMLReflowState& aReflowState, | |
| 104 nsHTMLReflowMetrics& aDesiredSize); | |
| 105 }; | |
| 106 | |
| 107 #endif /* nsLeafFrame_h___ */ |
