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+/*
+ * This file is part of the DOM implementation for KDE.
+ *
+ * Copyright (C) 2006 Allan Sandfeld Jensen (kde@carewolf.com)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef _DOM_restyler_h_
+#define _DOM_restyler_h_
+
+#include "misc/multimap.h"
+#include <bitset>
+
+namespace DOM {
+ class ElementImpl;
+}
+
+// Restyle dependency tracker for dynamic DOM
+
+namespace tdehtml {
+
+using DOM::ElementImpl;
+
+// These types are different types of dependencies, and serves to identify which element should be
+// restyled when a change of that kind triggers on the element
+enum StructuralDependencyType {
+ // Style relies on the children of the element (unaffected by append & close)
+ StructuralDependency = 0,
+ // Style relies on the last children of the element (affected by append & close)
+ BackwardsStructuralDependency = 1,
+ // Style relies on the element having hover
+ HoverDependency = 2,
+ // Style relies on the element being active
+ ActiveDependency = 3,
+ // Style relies on another state of element (focus, disabled, checked, etc.)
+ // (focus is special cased though since elements always depend on their own focus)
+ OtherStateDependency = 4,
+ LastStructuralDependency
+};
+
+// Attribute dependencies are much coarser than structural, for memory reasons rather than performance
+// This tracks global depencies of various kinds.
+// The groups are separated into where possible depending elements might be:
+enum AttributeDependencyType {
+ // Style of the changed element depend on this attribute
+ PersonalDependency = 0,
+ // Style of the elements children depend on this attribute
+ AncestorDependency = 1,
+ // Style of the elements later siblings or their children depend on this attribute
+ PredecessorDependency = 2,
+ LastAttributeDependency
+};
+
+
+/**
+ * @internal
+ */
+class DynamicDomRestyler {
+public:
+ DynamicDomRestyler();
+
+ // Structural dependencies are tracked from element to subject
+ void addDependency(ElementImpl* subject, ElementImpl* dependency, StructuralDependencyType type);
+ void resetDependencies(ElementImpl* subject);
+ void removeDependency(ElementImpl* subject, ElementImpl* dependency, StructuralDependencyType type);
+ void removeDependencies(ElementImpl* subject, StructuralDependencyType type);
+ void restyleDepedent(ElementImpl* dependency, StructuralDependencyType type);
+
+ // Attribute dependencies are traced on attribute alone
+ void addDependency(uint attrID, AttributeDependencyType type);
+ bool checkDependency(uint attrID, AttributeDependencyType type);
+
+ void dumpStats() const;
+private:
+ // Map of dependencies.
+ KMultiMap<ElementImpl> dependency_map[LastStructuralDependency];
+ // Map of reverse dependencies. For fast reset
+ KMultiMap<ElementImpl> reverse_map;
+
+ // Map of the various attribute dependencies
+ std::bitset<512> attribute_map[LastAttributeDependency];
+};
+
+}
+
+#endif
+