1 | /* |
2 | * Copyright (C) 2012 Apple Inc. All rights reserved. |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions |
6 | * are met: |
7 | * 1. Redistributions of source code must retain the above copyright |
8 | * notice, this list of conditions and the following disclaimer. |
9 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * notice, this list of conditions and the following disclaimer in the |
11 | * documentation and/or other materials provided with the distribution. |
12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
14 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
15 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
17 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
18 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
19 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
20 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
21 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
22 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
23 | * THE POSSIBILITY OF SUCH DAMAGE. |
24 | */ |
25 | |
26 | #include "config.h" |
27 | #include "ScrollingTreeNode.h" |
28 | |
29 | #if ENABLE(ASYNC_SCROLLING) |
30 | |
31 | #include "ScrollingStateTree.h" |
32 | #include "ScrollingTree.h" |
33 | #include "ScrollingTreeFrameScrollingNode.h" |
34 | #include <wtf/text/TextStream.h> |
35 | |
36 | namespace WebCore { |
37 | |
38 | ScrollingTreeNode::ScrollingTreeNode(ScrollingTree& scrollingTree, ScrollingNodeType nodeType, ScrollingNodeID nodeID) |
39 | : m_scrollingTree(scrollingTree) |
40 | , m_nodeType(nodeType) |
41 | , m_nodeID(nodeID) |
42 | , m_parent(nullptr) |
43 | { |
44 | } |
45 | |
46 | ScrollingTreeNode::~ScrollingTreeNode() = default; |
47 | |
48 | void ScrollingTreeNode::appendChild(Ref<ScrollingTreeNode>&& childNode) |
49 | { |
50 | childNode->setParent(this); |
51 | |
52 | if (!m_children) |
53 | m_children = std::make_unique<Vector<RefPtr<ScrollingTreeNode>>>(); |
54 | m_children->append(WTFMove(childNode)); |
55 | } |
56 | |
57 | void ScrollingTreeNode::removeChild(ScrollingTreeNode& node) |
58 | { |
59 | if (!m_children) |
60 | return; |
61 | |
62 | size_t index = m_children->find(&node); |
63 | |
64 | // The index will be notFound if the node to remove is a deeper-than-1-level descendant or |
65 | // if node is the root state node. |
66 | if (index != notFound) { |
67 | m_children->remove(index); |
68 | return; |
69 | } |
70 | |
71 | for (auto& child : *m_children) |
72 | child->removeChild(node); |
73 | } |
74 | |
75 | bool ScrollingTreeNode::isRootNode() const |
76 | { |
77 | return m_scrollingTree.rootNode() == this; |
78 | } |
79 | |
80 | void ScrollingTreeNode::dumpProperties(TextStream& ts, ScrollingStateTreeAsTextBehavior behavior) const |
81 | { |
82 | if (behavior & ScrollingStateTreeAsTextBehaviorIncludeNodeIDs) |
83 | ts.dumpProperty("nodeID" , scrollingNodeID()); |
84 | } |
85 | |
86 | ScrollingTreeFrameScrollingNode* ScrollingTreeNode::enclosingFrameNodeIncludingSelf() |
87 | { |
88 | auto* node = this; |
89 | while (node && !node->isFrameScrollingNode()) |
90 | node = node->parent(); |
91 | |
92 | return downcast<ScrollingTreeFrameScrollingNode>(node); |
93 | } |
94 | |
95 | ScrollingTreeScrollingNode* ScrollingTreeNode::enclosingScrollingNodeIncludingSelf() |
96 | { |
97 | auto* node = this; |
98 | while (node && !node->isScrollingNode()) |
99 | node = node->parent(); |
100 | |
101 | return downcast<ScrollingTreeScrollingNode>(node); |
102 | } |
103 | |
104 | void ScrollingTreeNode::dump(TextStream& ts, ScrollingStateTreeAsTextBehavior behavior) const |
105 | { |
106 | dumpProperties(ts, behavior); |
107 | |
108 | if (m_children) { |
109 | for (auto& child : *m_children) { |
110 | TextStream::GroupScope scope(ts); |
111 | child->dump(ts, behavior); |
112 | } |
113 | } |
114 | } |
115 | |
116 | ScrollingTreeScrollingNode* ScrollingTreeNode::scrollingNodeForPoint(LayoutPoint parentPoint) const |
117 | { |
118 | LayoutPoint localPoint = parentToLocalPoint(parentPoint); |
119 | LayoutPoint contentsPoint = localToContentsPoint(localPoint); |
120 | |
121 | if (children()) { |
122 | for (auto iterator = children()->rbegin(), end = children()->rend(); iterator != end; iterator++) { |
123 | if (auto node = (**iterator).scrollingNodeForPoint(contentsPoint)) |
124 | return node; |
125 | } |
126 | } |
127 | |
128 | return nullptr; |
129 | } |
130 | |
131 | } // namespace WebCore |
132 | |
133 | #endif // ENABLE(ASYNC_SCROLLING) |
134 | |