Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.diagram / src / org / simantics / diagram / handler / DiagramSelection.java

diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/handler/DiagramSelection.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/handler/DiagramSelection.java
new file mode 100644 (file)
index 0000000..d304dc2
--- /dev/null
+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/handler/DiagramSelection.java
@@ -0,0 +1,129 @@
+/*******************************************************************************\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.diagram.handler;\r
+\r
+import java.awt.geom.Point2D;\r
+import java.lang.ref.WeakReference;\r
+import java.util.Collections;\r
+import java.util.Set;\r
+\r
+import org.simantics.db.Resource;\r
+import org.simantics.g2d.canvas.ICanvasContext;\r
+import org.simantics.g2d.element.IElement;\r
+import org.simantics.utils.strings.EString;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class DiagramSelection {\r
+\r
+    public static final DiagramSelection EMPTY = new DiagramSelection((Resource) null);\r
+\r
+    // Reference may be null\r
+    private final WeakReference<ICanvasContext> sourceCanvas;\r
+    private final Resource source;\r
+\r
+    /**\r
+     * May be empty or at least invalid after the source canvas no longer\r
+     * exists. Should not be used for anything besides visualisation.\r
+     */\r
+    private transient final Set<IElement> elements;\r
+\r
+    private final ElementObjectAssortment assortment;\r
+    private final boolean cut;\r
+    private final Point2D copyPos;\r
+\r
+    private DiagramSelection(Resource source) {\r
+        this.sourceCanvas = null;\r
+        this.source = source;\r
+        this.elements = Collections.emptySet();\r
+        this.assortment = ElementObjectAssortment.fromElements(elements);\r
+        this.cut = false;\r
+        this.copyPos = new Point2D.Double();\r
+    }\r
+\r
+    public DiagramSelection(ICanvasContext sourceCanvas, Resource source, Set<IElement> elements, boolean cut, Point2D copyPos) {\r
+        assert source != null;\r
+        assert elements != null;\r
+\r
+        this.sourceCanvas = new WeakReference<ICanvasContext>(sourceCanvas);\r
+        this.source = source;\r
+        this.elements = Collections.unmodifiableSet(elements);\r
+        this.assortment = ElementObjectAssortment.fromElements(elements);\r
+        this.cut = cut;\r
+        this.copyPos = copyPos;\r
+    }\r
+\r
+    /**\r
+     * @return <code>null</code> if the source canvas has already been disposed.\r
+     */\r
+    public ICanvasContext getSourceCanvas() {\r
+        ICanvasContext ctx = sourceCanvas == null ? null : sourceCanvas.get();\r
+        return ctx == null ? null : ctx.isDisposed() ? null : ctx;\r
+    }\r
+\r
+    public boolean isFromCanvasContext(ICanvasContext ctx) {\r
+        ICanvasContext srcCtx = getSourceCanvas();\r
+        return ctx != null && ctx == srcCtx;\r
+    }\r
+\r
+    public Resource getSourceDiagram() {\r
+        return source;\r
+    }\r
+\r
+    public boolean isCut() {\r
+        return cut;\r
+    }\r
+\r
+    public Point2D getCopyPos() {\r
+        return copyPos;\r
+    }\r
+\r
+    public Set<IElement> getOriginalElements() {\r
+        return elements;\r
+    }\r
+\r
+    public ElementObjectAssortment getAssortment() {\r
+        return assortment;\r
+    }\r
+\r
+    public boolean isEmpty() {\r
+        return getAssortment().isEmpty();\r
+    }\r
+\r
+    @Override\r
+    public String toString() {\r
+        StringBuilder sb = new StringBuilder();\r
+        sb.append("Diagram selection of ");\r
+        sb.append(elements.size());\r
+        sb.append(" element(s) ");\r
+        if (cut)\r
+            sb.append("cut");\r
+        else\r
+            sb.append("copied");\r
+        sb.append(" from ");\r
+        sb.append(source);\r
+        sb.append(" with reference position ");\r
+        sb.append(copyPos);\r
+        if (elements != null && !elements.isEmpty()) {\r
+            sb.append(":\n");\r
+            String elems = EString.implode(elements, "\n");\r
+            if (elems != null)\r
+                sb.append(EString.addPrefix(elems, "\t"));\r
+        }\r
+        if (assortment != null && !assortment.isEmpty()) {\r
+            sb.append(assortment.toString());\r
+        }\r
+        return sb.toString();\r
+    }\r
+}\r
+\r