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Unified Diff: third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp

Issue 1489433002: Support the essential part of Shadow DOM v1 (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Remove one TODO Created 5 years ago
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Index: third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp
diff --git a/third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp b/third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..3b288046f08b16aebd1ce76bceb43e52362b4511
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp
@@ -0,0 +1,119 @@
+/*
tkent 2015/12/10 04:23:02 Use the 3-line header.
hayato 2015/12/10 08:11:21 Done.
+ * Copyright (C) 2015 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
tkent 2015/12/10 04:23:02 Remove a blank line
hayato 2015/12/10 08:11:21 Done.
+#include "core/dom/shadow/SlotAssignment.h"
+
+#include "core/HTMLNames.h"
+#include "core/dom/ElementTraversal.h"
+#include "core/dom/NodeTraversal.h"
+#include "core/dom/shadow/InsertionPoint.h"
+#include "core/dom/shadow/ShadowRoot.h"
+#include "core/html/HTMLSlotElement.h"
+
+namespace blink {
+
+HTMLSlotElement* SlotAssignment::assignedSlotFor(const Node& node) const
+{
+ return m_assignment.get(const_cast<Node*>(&node));
+}
+
+static void detachNotAssignedNode(Node& node)
+{
+ if (node.layoutObject())
+ node.lazyReattachIfAttached();
+}
+
+void SlotAssignment::resolveAssignment(const ShadowRoot& shadowRoot)
+{
+ m_assignment.clear();
+
+ using Name2Slot = HashMap<AtomicString, HTMLSlotElement*>;
+ Name2Slot name2slot;
+ HTMLSlotElement* defaultSlot = nullptr;
+
+ // TODO(hayato): Cache slots elements so that we do not have to travese the shadow tree. See ShadowRoot::descendantInsertionPoints()
+ for (HTMLSlotElement& slot : Traversal<HTMLSlotElement>::descendantsOf(shadowRoot)) {
+ slot.clearDistribution();
+
+ AtomicString name = slot.fastGetAttribute(HTMLNames::nameAttr);
+ if ((name.isEmpty() || name.isNull()) && !defaultSlot)
+ defaultSlot = &slot;
+ else
+ name2slot.add(name, &slot);
+ }
+
+ for (Node& child : NodeTraversal::childrenOf(*shadowRoot.host())) {
+ if (child.isElementNode()) {
+ if (isActiveInsertionPoint(child)) {
+ // TODO(hayato): Support re-distribution across v0 and v1 shadow trees
+ detachNotAssignedNode(child);
+ continue;
+ }
+ AtomicString slotName = toElement(child).fastGetAttribute(HTMLNames::slotAttr);
+ if (slotName.isNull() || slotName.isEmpty()) {
+ if (defaultSlot)
+ assign(child, *defaultSlot);
+ else
+ detachNotAssignedNode(child);
+ } else {
+ HTMLSlotElement* slot = name2slot.get(slotName);
+ if (slot)
+ assign(child, *slot);
+ else
+ detachNotAssignedNode(child);
+ }
+ } else if (defaultSlot) {
+ assign(child, *defaultSlot);
+ } else {
+ detachNotAssignedNode(child);
+ }
+ }
+}
+
+void SlotAssignment::assign(Node& hostChild, HTMLSlotElement& slot)
+{
+ m_assignment.add(&hostChild, &slot);
+ slot.appendAssignedNode(hostChild);
+ if (isHTMLSlotElement(hostChild))
+ slot.appendDistributedNodes(toHTMLSlotElement(hostChild).getDistributedNodes());
+ else
+ slot.appendDistributedNode(hostChild);
+}
+
+DEFINE_TRACE(SlotAssignment)
+{
+#if ENABLE(OILPAN)
+ visitor->trace(m_assignment);
+#endif
+}
+
+} // namespace blink

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