Background doesn't fully repaint when body has margins.
[WebKit-https.git] / Source / WebCore / rendering / RenderObjectChildList.cpp
1 /*
2  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
3  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
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6  * modification, are permitted provided that the following conditions
7  * are met:
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10  * 2. Redistributions in binary form must reproduce the above copyright
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12  *    documentation and/or other materials provided with the distribution.
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25  */
26
27 #include "config.h"
28 #include "RenderObjectChildList.h"
29
30 #include "AXObjectCache.h"
31 #include "RenderCounter.h"
32 #include "RenderObject.h"
33 #include "RenderStyle.h"
34 #include "RenderView.h"
35
36 namespace WebCore {
37
38 void RenderObjectChildList::destroyLeftoverChildren()
39 {
40     while (firstChild()) {
41         if (firstChild()->isListMarker() || (firstChild()->style()->styleType() == FIRST_LETTER && !firstChild()->isText()))
42             firstChild()->remove();  // List markers are owned by their enclosing list and so don't get destroyed by this container. Similarly, first letters are destroyed by their remaining text fragment.
43         else if (firstChild()->isRunIn() && firstChild()->node()) {
44             firstChild()->node()->setRenderer(0);
45             firstChild()->node()->setNeedsStyleRecalc();
46             firstChild()->destroy();
47         } else {
48             // Destroy any anonymous children remaining in the render tree, as well as implicit (shadow) DOM elements like those used in the engine-based text fields.
49             if (firstChild()->node())
50                 firstChild()->node()->setRenderer(0);
51             firstChild()->destroy();
52         }
53     }
54 }
55
56 RenderObject* RenderObjectChildList::removeChildNode(RenderObject* owner, RenderObject* oldChild, bool notifyRenderer)
57 {
58     ASSERT(oldChild->parent() == owner);
59
60     if (oldChild->isFloatingOrOutOfFlowPositioned())
61         toRenderBox(oldChild)->removeFloatingOrPositionedChildFromBlockLists();
62
63     // So that we'll get the appropriate dirty bit set (either that a normal flow child got yanked or
64     // that a positioned child got yanked). We also repaint, so that the area exposed when the child
65     // disappears gets repainted properly.
66     if (!owner->documentBeingDestroyed() && notifyRenderer && oldChild->everHadLayout()) {
67         oldChild->setNeedsLayoutAndPrefWidthsRecalc();
68         // We only repaint |oldChild| if we have a RenderLayer as its visual overflow may not be tracked by its parent.
69         if (oldChild->isBody())
70             owner->view()->repaintRootContents();
71         else
72             oldChild->repaint();
73     }
74
75     // If we have a line box wrapper, delete it.
76     if (oldChild->isBox())
77         toRenderBox(oldChild)->deleteLineBoxWrapper();
78
79     // If oldChild is the start or end of the selection, then clear the selection to
80     // avoid problems of invalid pointers.
81     // FIXME: The FrameSelection should be responsible for this when it
82     // is notified of DOM mutations.
83     if (!owner->documentBeingDestroyed() && oldChild->isSelectionBorder())
84         owner->view()->clearSelection();
85
86     if (!owner->documentBeingDestroyed() && notifyRenderer)
87         oldChild->willBeRemovedFromTree();
88
89     // WARNING: There should be no code running between willBeRemovedFromTree and the actual removal below.
90     // This is needed to avoid race conditions where willBeRemovedFromTree would dirty the tree's structure
91     // and the code running here would force an untimely rebuilding, leaving |oldChild| dangling.
92
93     if (oldChild->previousSibling())
94         oldChild->previousSibling()->setNextSibling(oldChild->nextSibling());
95     if (oldChild->nextSibling())
96         oldChild->nextSibling()->setPreviousSibling(oldChild->previousSibling());
97
98     if (firstChild() == oldChild)
99         setFirstChild(oldChild->nextSibling());
100     if (lastChild() == oldChild)
101         setLastChild(oldChild->previousSibling());
102
103     oldChild->setPreviousSibling(0);
104     oldChild->setNextSibling(0);
105     oldChild->setParent(0);
106
107     // rendererRemovedFromTree walks the whole subtree. We can improve performance
108     // by skipping this step when destroying the entire tree.
109     if (!owner->documentBeingDestroyed())
110         RenderCounter::rendererRemovedFromTree(oldChild);
111
112     if (AXObjectCache* cache = owner->document()->existingAXObjectCache())
113         cache->childrenChanged(owner);
114
115     return oldChild;
116 }
117
118 void RenderObjectChildList::insertChildNode(RenderObject* owner, RenderObject* newChild, RenderObject* beforeChild, bool notifyRenderer)
119 {
120     ASSERT(!newChild->parent());
121     ASSERT(!owner->isBlockFlow() || (!newChild->isTableSection() && !newChild->isTableRow() && !newChild->isTableCell()));
122
123     while (beforeChild && beforeChild->parent() && beforeChild->parent() != owner)
124         beforeChild = beforeChild->parent();
125
126     // This should never happen, but if it does prevent render tree corruption
127     // where child->parent() ends up being owner but child->nextSibling()->parent()
128     // is not owner.
129     if (beforeChild && beforeChild->parent() != owner) {
130         ASSERT_NOT_REACHED();
131         return;
132     }
133
134     newChild->setParent(owner);
135
136     if (firstChild() == beforeChild)
137         setFirstChild(newChild);
138
139     if (beforeChild) {
140         RenderObject* previousSibling = beforeChild->previousSibling();
141         if (previousSibling)
142             previousSibling->setNextSibling(newChild);
143         newChild->setPreviousSibling(previousSibling);
144         newChild->setNextSibling(beforeChild);
145         beforeChild->setPreviousSibling(newChild);
146     } else {
147         if (lastChild())
148             lastChild()->setNextSibling(newChild);
149         newChild->setPreviousSibling(lastChild());
150         setLastChild(newChild);
151     }
152
153     if (!owner->documentBeingDestroyed() && notifyRenderer)
154         newChild->insertedIntoTree();
155
156     if (!owner->documentBeingDestroyed()) {
157         RenderCounter::rendererSubtreeAttached(newChild);
158     }
159
160     newChild->setNeedsLayoutAndPrefWidthsRecalc();
161     owner->setPreferredLogicalWidthsDirty(true);
162     if (!owner->normalChildNeedsLayout())
163         owner->setChildNeedsLayout(true); // We may supply the static position for an absolute positioned child.
164
165     if (AXObjectCache* cache = owner->document()->axObjectCache())
166         cache->childrenChanged(owner);
167 }
168
169 } // namespace WebCore