/src/mozilla-central/layout/generic/nsLeafFrame.h
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1 | | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
2 | | /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
3 | | /* This Source Code Form is subject to the terms of the Mozilla Public |
4 | | * License, v. 2.0. If a copy of the MPL was not distributed with this |
5 | | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
6 | | |
7 | | /* base class for rendering objects that do not have child lists */ |
8 | | |
9 | | #ifndef nsLeafFrame_h___ |
10 | | #define nsLeafFrame_h___ |
11 | | |
12 | | #include "mozilla/Attributes.h" |
13 | | #include "nsFrame.h" |
14 | | #include "nsDisplayList.h" |
15 | | |
16 | | /** |
17 | | * Abstract class that provides simple fixed-size layout for leaf objects |
18 | | * (e.g. images, form elements, etc.). Deriviations provide the implementation |
19 | | * of the GetDesiredSize method. The rendering method knows how to render |
20 | | * borders and backgrounds. |
21 | | */ |
22 | | class nsLeafFrame : public nsFrame { |
23 | | public: |
24 | | NS_DECL_ABSTRACT_FRAME(nsLeafFrame) |
25 | | |
26 | | // nsIFrame replacements |
27 | | virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder, |
28 | 0 | const nsDisplayListSet& aLists) override { |
29 | 0 | DO_GLOBAL_REFLOW_COUNT_DSP("nsLeafFrame"); |
30 | 0 | DisplayBorderBackgroundOutline(aBuilder, aLists); |
31 | 0 | } |
32 | | |
33 | | /** |
34 | | * Both GetMinISize and GetPrefISize will return whatever GetIntrinsicISize |
35 | | * returns. |
36 | | */ |
37 | | virtual nscoord GetMinISize(gfxContext *aRenderingContext) override; |
38 | | virtual nscoord GetPrefISize(gfxContext *aRenderingContext) override; |
39 | | |
40 | | /** |
41 | | * Our auto size is just intrinsic width and intrinsic height. |
42 | | */ |
43 | | virtual mozilla::LogicalSize |
44 | | ComputeAutoSize(gfxContext* aRenderingContext, |
45 | | mozilla::WritingMode aWM, |
46 | | const mozilla::LogicalSize& aCBSize, |
47 | | nscoord aAvailableISize, |
48 | | const mozilla::LogicalSize& aMargin, |
49 | | const mozilla::LogicalSize& aBorder, |
50 | | const mozilla::LogicalSize& aPadding, |
51 | | ComputeSizeFlags aFlags) override; |
52 | | |
53 | | /** |
54 | | * Each of our subclasses should provide its own Reflow impl: |
55 | | */ |
56 | | virtual void Reflow(nsPresContext* aPresContext, |
57 | | ReflowOutput& aDesiredSize, |
58 | | const ReflowInput& aReflowInput, |
59 | | nsReflowStatus& aStatus) override = 0; |
60 | | |
61 | | virtual bool IsFrameOfType(uint32_t aFlags) const override |
62 | 0 | { |
63 | 0 | // We don't actually contain a block, but we do always want a |
64 | 0 | // computed width, so tell a little white lie here. |
65 | 0 | return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplacedContainsBlock)); |
66 | 0 | } |
67 | | |
68 | | protected: |
69 | | nsLeafFrame(ComputedStyle* aStyle, ClassID aID) |
70 | | : nsFrame(aStyle, aID) |
71 | 0 | {} |
72 | | |
73 | | virtual ~nsLeafFrame(); |
74 | | |
75 | | /** |
76 | | * Return the intrinsic isize of the frame's content area. Note that this |
77 | | * should not include borders or padding and should not depend on the applied |
78 | | * styles. |
79 | | */ |
80 | | virtual nscoord GetIntrinsicISize() = 0; |
81 | | |
82 | | /** |
83 | | * Return the intrinsic bsize of the frame's content area. This should not |
84 | | * include border or padding. This will only matter if the specified bsize |
85 | | * is auto. Note that subclasses must either implement this or override |
86 | | * Reflow and ComputeAutoSize; the default Reflow and ComputeAutoSize impls |
87 | | * call this method. |
88 | | */ |
89 | | virtual nscoord GetIntrinsicBSize(); |
90 | | |
91 | | /** |
92 | | * Set aDesiredSize to be the available size |
93 | | */ |
94 | | void SizeToAvailSize(const ReflowInput& aReflowInput, |
95 | | ReflowOutput& aDesiredSize); |
96 | | }; |
97 | | |
98 | | #endif /* nsLeafFrame_h___ */ |