layout/generic/nsPlaceholderFrame.cpp@6474c204b198
layout/generic/nsPlaceholderFrame.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
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/. */
6 /*
7 * rendering object for the point that anchors out-of-flow rendering
8 * objects such as floats and absolutely positioned elements
9 */
11 #include "nsPlaceholderFrame.h"
13 #include "nsDisplayList.h"
14 #include "nsFrameManager.h"
15 #include "nsLayoutUtils.h"
16 #include "nsPresContext.h"
17 #include "nsRenderingContext.h"
18 #include "nsIFrameInlines.h"
20 nsIFrame*
21 NS_NewPlaceholderFrame(nsIPresShell* aPresShell, nsStyleContext* aContext,
22 nsFrameState aTypeBit)
23 {
24 return new (aPresShell) nsPlaceholderFrame(aContext, aTypeBit);
25 }
27 NS_IMPL_FRAMEARENA_HELPERS(nsPlaceholderFrame)
29 #ifdef DEBUG
30 NS_QUERYFRAME_HEAD(nsPlaceholderFrame)
31 NS_QUERYFRAME_ENTRY(nsPlaceholderFrame)
32 NS_QUERYFRAME_TAIL_INHERITING(nsFrame)
33 #endif
35 /* virtual */ nsSize
36 nsPlaceholderFrame::GetMinSize(nsBoxLayoutState& aBoxLayoutState)
37 {
38 nsSize size(0, 0);
39 DISPLAY_MIN_SIZE(this, size);
40 return size;
41 }
43 /* virtual */ nsSize
44 nsPlaceholderFrame::GetPrefSize(nsBoxLayoutState& aBoxLayoutState)
45 {
46 nsSize size(0, 0);
47 DISPLAY_PREF_SIZE(this, size);
48 return size;
49 }
51 /* virtual */ nsSize
52 nsPlaceholderFrame::GetMaxSize(nsBoxLayoutState& aBoxLayoutState)
53 {
54 nsSize size(NS_INTRINSICSIZE, NS_INTRINSICSIZE);
55 DISPLAY_MAX_SIZE(this, size);
56 return size;
57 }
59 /* virtual */ void
60 nsPlaceholderFrame::AddInlineMinWidth(nsRenderingContext* aRenderingContext,
61 nsIFrame::InlineMinWidthData* aData)
62 {
63 // Override AddInlineMinWith so that *nothing* happens. In
64 // particular, we don't want to zero out |aData->trailingWhitespace|,
65 // since nsLineLayout skips placeholders when trimming trailing
66 // whitespace, and we don't want to set aData->skipWhitespace to
67 // false.
69 // ...but push floats onto the list
70 if (mOutOfFlowFrame->IsFloating()) {
71 nscoord floatWidth =
72 nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
73 mOutOfFlowFrame,
74 nsLayoutUtils::MIN_WIDTH);
75 aData->floats.AppendElement(
76 InlineIntrinsicWidthData::FloatInfo(mOutOfFlowFrame, floatWidth));
77 }
78 }
80 /* virtual */ void
81 nsPlaceholderFrame::AddInlinePrefWidth(nsRenderingContext* aRenderingContext,
82 nsIFrame::InlinePrefWidthData* aData)
83 {
84 // Override AddInlinePrefWith so that *nothing* happens. In
85 // particular, we don't want to zero out |aData->trailingWhitespace|,
86 // since nsLineLayout skips placeholders when trimming trailing
87 // whitespace, and we don't want to set aData->skipWhitespace to
88 // false.
90 // ...but push floats onto the list
91 if (mOutOfFlowFrame->IsFloating()) {
92 nscoord floatWidth =
93 nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
94 mOutOfFlowFrame,
95 nsLayoutUtils::PREF_WIDTH);
96 aData->floats.AppendElement(
97 InlineIntrinsicWidthData::FloatInfo(mOutOfFlowFrame, floatWidth));
98 }
99 }
101 nsresult
102 nsPlaceholderFrame::Reflow(nsPresContext* aPresContext,
103 nsHTMLReflowMetrics& aDesiredSize,
104 const nsHTMLReflowState& aReflowState,
105 nsReflowStatus& aStatus)
106 {
107 #ifdef DEBUG
108 // We should be getting reflowed before our out-of-flow.
109 // If this is our first reflow, and our out-of-flow has already received its
110 // first reflow (before us), complain.
111 // XXXdholbert This "look for a previous continuation or IB-split sibling"
112 // code could use nsLayoutUtils::GetPrevContinuationOrIBSplitSibling(), if
113 // we ever add a function like that. (We currently have a "Next" version.)
114 if ((GetStateBits() & NS_FRAME_FIRST_REFLOW) &&
115 !(mOutOfFlowFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
117 // Unfortunately, this can currently happen when the placeholder is in a
118 // later continuation or later IB-split sibling than its out-of-flow (as
119 // is the case in some of our existing unit tests). So for now, in that
120 // case, we'll warn instead of asserting.
121 bool isInContinuationOrIBSplit = false;
122 nsIFrame* ancestor = this;
123 while ((ancestor = ancestor->GetParent())) {
124 if (ancestor->GetPrevContinuation() ||
125 ancestor->Properties().Get(IBSplitPrevSibling())) {
126 isInContinuationOrIBSplit = true;
127 break;
128 }
129 }
131 if (isInContinuationOrIBSplit) {
132 NS_WARNING("Out-of-flow frame got reflowed before its placeholder");
133 } else {
134 NS_ERROR("Out-of-flow frame got reflowed before its placeholder");
135 }
136 }
137 #endif
139 DO_GLOBAL_REFLOW_COUNT("nsPlaceholderFrame");
140 DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
141 aDesiredSize.Width() = 0;
142 aDesiredSize.Height() = 0;
144 aStatus = NS_FRAME_COMPLETE;
145 NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
146 return NS_OK;
147 }
149 void
150 nsPlaceholderFrame::DestroyFrom(nsIFrame* aDestructRoot)
151 {
152 nsIFrame* oof = mOutOfFlowFrame;
153 if (oof) {
154 // Unregister out-of-flow frame
155 nsFrameManager* fm = PresContext()->GetPresShell()->FrameManager();
156 fm->UnregisterPlaceholderFrame(this);
157 mOutOfFlowFrame = nullptr;
158 // If aDestructRoot is not an ancestor of the out-of-flow frame,
159 // then call RemoveFrame on it here.
160 // Also destroy it here if it's a popup frame. (Bug 96291)
161 if ((GetStateBits() & PLACEHOLDER_FOR_POPUP) ||
162 !nsLayoutUtils::IsProperAncestorFrame(aDestructRoot, oof)) {
163 ChildListID listId = nsLayoutUtils::GetChildListNameFor(oof);
164 fm->RemoveFrame(listId, oof);
165 }
166 // else oof will be destroyed by its parent
167 }
169 nsFrame::DestroyFrom(aDestructRoot);
170 }
172 nsIAtom*
173 nsPlaceholderFrame::GetType() const
174 {
175 return nsGkAtoms::placeholderFrame;
176 }
178 /* virtual */ bool
179 nsPlaceholderFrame::CanContinueTextRun() const
180 {
181 if (!mOutOfFlowFrame) {
182 return false;
183 }
184 // first-letter frames can continue text runs, and placeholders for floated
185 // first-letter frames can too
186 return mOutOfFlowFrame->CanContinueTextRun();
187 }
189 nsIFrame*
190 nsPlaceholderFrame::GetParentStyleContextFrame() const
191 {
192 NS_PRECONDITION(GetParent(), "How can we not have a parent here?");
194 // Lie about our pseudo so we can step out of all anon boxes and
195 // pseudo-elements. The other option would be to reimplement the
196 // {ib} split gunk here.
197 return CorrectStyleParentFrame(GetParent(), nsGkAtoms::placeholderFrame);
198 }
201 #ifdef DEBUG
202 static void
203 PaintDebugPlaceholder(nsIFrame* aFrame, nsRenderingContext* aCtx,
204 const nsRect& aDirtyRect, nsPoint aPt)
205 {
206 aCtx->SetColor(NS_RGB(0, 255, 255));
207 nscoord x = nsPresContext::CSSPixelsToAppUnits(-5);
208 aCtx->FillRect(aPt.x + x, aPt.y,
209 nsPresContext::CSSPixelsToAppUnits(13),
210 nsPresContext::CSSPixelsToAppUnits(3));
211 nscoord y = nsPresContext::CSSPixelsToAppUnits(-10);
212 aCtx->FillRect(aPt.x, aPt.y + y,
213 nsPresContext::CSSPixelsToAppUnits(3),
214 nsPresContext::CSSPixelsToAppUnits(10));
215 }
216 #endif // DEBUG
218 #if defined(DEBUG) || (defined(MOZ_REFLOW_PERF_DSP) && defined(MOZ_REFLOW_PERF))
220 void
221 nsPlaceholderFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
222 const nsRect& aDirtyRect,
223 const nsDisplayListSet& aLists)
224 {
225 DO_GLOBAL_REFLOW_COUNT_DSP("nsPlaceholderFrame");
227 #ifdef DEBUG
228 if (GetShowFrameBorders()) {
229 aLists.Outlines()->AppendNewToTop(
230 new (aBuilder) nsDisplayGeneric(aBuilder, this, PaintDebugPlaceholder,
231 "DebugPlaceholder",
232 nsDisplayItem::TYPE_DEBUG_PLACEHOLDER));
233 }
234 #endif
235 }
236 #endif // DEBUG || (MOZ_REFLOW_PERF_DSP && MOZ_REFLOW_PERF)
238 #ifdef DEBUG_FRAME_DUMP
239 nsresult
240 nsPlaceholderFrame::GetFrameName(nsAString& aResult) const
241 {
242 return MakeFrameName(NS_LITERAL_STRING("Placeholder"), aResult);
243 }
245 void
246 nsPlaceholderFrame::List(FILE* out, const char* aPrefix, uint32_t aFlags) const
247 {
248 nsCString str;
249 ListGeneric(str, aPrefix, aFlags);
251 if (mOutOfFlowFrame) {
252 str += " outOfFlowFrame=";
253 nsFrame::ListTag(str, mOutOfFlowFrame);
254 }
255 fprintf_stderr(out, "%s\n", str.get());
256 }
257 #endif
