Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.g2d / src / org / simantics / g2d / diagram / participant / DiagramParticipant.java

diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/diagram/participant/DiagramParticipant.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/diagram/participant/DiagramParticipant.java
new file mode 100644 (file)
index 0000000..c1064da
--- /dev/null
+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/diagram/participant/DiagramParticipant.java
@@ -0,0 +1,197 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.g2d.diagram.participant;\r
+\r
+import java.util.Map;\r
+\r
+import org.simantics.g2d.diagram.IDiagram;\r
+import org.simantics.g2d.diagram.IDiagram.CompositionListener;\r
+import org.simantics.g2d.diagram.handler.CanvasListener;\r
+import org.simantics.g2d.element.IElement;\r
+import org.simantics.utils.datastructures.hints.HintContext;\r
+import org.simantics.utils.datastructures.hints.IHintContext;\r
+import org.simantics.utils.datastructures.hints.IHintContext.Key;\r
+\r
+/**\r
+ * DiagramParticipant sends events to CanvasMonitors (=diagram handler)\r
+ * \r
+ * DiagramParticipant must be added to canvas context before diagram is set.\r
+ * \r
+ * @author Toni Kalajainen\r
+ */\r
+public class DiagramParticipant extends AbstractDiagramParticipant {\r
+\r
+    IHintContext ctx = new HintContext();\r
+\r
+    /**\r
+     * Diagram composition listener\r
+     */\r
+    CompositionListener listener = new CompositionListener() {\r
+        @Override\r
+        public void onElementAdded(IDiagram d, IElement e) {\r
+\r
+        }\r
+        @Override\r
+        public void onElementRemoved(IDiagram d, IElement e) {\r
+            // TODO Remove element variables...  somehow efficiently\r
+        }\r
+    };\r
+\r
+    @Override\r
+    protected void onDiagramSet(IDiagram newDiagram, IDiagram oldDiagram) {\r
+        if (clazz==null) return;\r
+        for (CanvasListener cm : clazz.getItemsByClass(CanvasListener.class))\r
+            cm.onAddedToCanvas(newDiagram, getContext());\r
+\r
+        if (newDiagram==null)\r
+            for (Key key : ctx.getHints().keySet())\r
+                ctx.removeHint(key);\r
+\r
+        if (oldDiagram!=null) oldDiagram.removeCompositionListener(listener);\r
+        if (newDiagram!=null) newDiagram.addCompositionListener(listener);\r
+    }\r
+\r
+    public void setElementHint(IElement e, Key key, Object value)\r
+    {\r
+        Key elementCtxKey = new ElementCtxKey(e);\r
+        IHintContext elementCtx = ctx.getHint(elementCtxKey);\r
+        if (elementCtx==null) {\r
+            elementCtx = new HintContext();\r
+            ctx.setHint(elementCtxKey, elementCtx);\r
+        }\r
+        elementCtx.setHint(key, value);\r
+    }\r
+\r
+    public <E> E getElementHint(IElement e, Key key)\r
+    {\r
+        Key elementCtxKey = new ElementCtxKey(e);\r
+        IHintContext elementCtx = ctx.getHint(elementCtxKey);\r
+        if (elementCtx==null) return null;\r
+        return elementCtx.getHint(key);\r
+    }\r
+\r
+    public Map<Key, Object> getElementHints(IElement e)\r
+    {\r
+        Key elementCtxKey = new ElementCtxKey(e);\r
+        IHintContext elementCtx = ctx.getHint(elementCtxKey);\r
+        if (elementCtx==null) return null;\r
+        return elementCtx.getHints();\r
+    }\r
+\r
+    public <E> E removeElementHint(IElement e, Key key)\r
+    {\r
+        Key elementCtxKey = new ElementCtxKey(e);\r
+        IHintContext elementCtx = ctx.getHint(elementCtxKey);\r
+        if (elementCtx==null) return null;\r
+        return elementCtx.removeHint(key);\r
+    }\r
+\r
+    public void setDiagramHint(IDiagram d, Key key, Object value)\r
+    {\r
+        ctx.setHint(key, value);\r
+    }\r
+\r
+    public <E> E removeDiagramHint(IDiagram d, Key key)\r
+    {\r
+        return ctx.removeHint(key);\r
+    }\r
+\r
+    @SuppressWarnings("unused")\r
+    private class DiagramKey extends Key {\r
+        public final IDiagram d;\r
+        private final int hash;\r
+        public final Key key;\r
+\r
+        public DiagramKey(IDiagram d, Key key)\r
+        {\r
+            super();\r
+            assert(key!=null);\r
+            this.key = key;\r
+            this.d = d;\r
+            this.hash = key.hashCode() ^ d.hashCode();\r
+        }\r
+        @Override\r
+        public int hashCode() {\r
+            return hash;\r
+        }\r
+        @Override\r
+        public boolean equals(Object obj) {\r
+            if (!(obj instanceof DiagramKey)) return false;\r
+            DiagramKey other = (DiagramKey) obj;\r
+            if (other.key.equals(key)) return false;\r
+            if (other.d != d) return false;\r
+            return true;\r
+        }\r
+        @Override\r
+        public boolean isValueAccepted(Object value) {\r
+            return key.isValueAccepted(value);\r
+        }\r
+\r
+    }\r
+\r
+    private class ElementKey extends Key {\r
+        public final IElement e;\r
+        private final int hash;\r
+        public final Key key;\r
+\r
+        public ElementKey(IElement e, Key key)\r
+        {\r
+            super();\r
+            assert(key!=null);\r
+            this.key = key;\r
+            this.e = e;\r
+            this.hash = key.hashCode() ^ e.hashCode();\r
+        }\r
+        @Override\r
+        public int hashCode() {\r
+            return hash;\r
+        }\r
+        @Override\r
+        public boolean equals(Object obj) {\r
+            if (!(obj instanceof ElementKey)) return false;\r
+            ElementKey other = (ElementKey) obj;\r
+            if (other.e != e) return false;\r
+            if (!other.key.equals(key)) return false;\r
+            return true;\r
+        }\r
+        @Override\r
+        public boolean isValueAccepted(Object value) {\r
+            return key.isValueAccepted(value);\r
+        }\r
+    }\r
+\r
+    private class ElementCtxKey extends Key {\r
+        public final IElement e;\r
+\r
+        public ElementCtxKey(IElement e)\r
+        {\r
+            super();\r
+            this.e = e;\r
+        }\r
+        @Override\r
+        public int hashCode() {\r
+            return e.hashCode();\r
+        }\r
+        @Override\r
+        public boolean equals(Object obj) {\r
+            if (!(obj instanceof ElementCtxKey)) return false;\r
+            ElementCtxKey other = (ElementCtxKey) obj;\r
+            return other.e == e;\r
+        }\r
+        @Override\r
+        public boolean isValueAccepted(Object value) {\r
+            return value instanceof IHintContext;\r
+        }\r
+    }\r
+\r
+\r
+}\r