X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.diagram%2Fsrc%2Forg%2Fsimantics%2Fdiagram%2Fhandler%2FDiagramSelection.java;fp=bundles%2Forg.simantics.diagram%2Fsrc%2Forg%2Fsimantics%2Fdiagram%2Fhandler%2FDiagramSelection.java;h=d304dc279e132f53f824ad00a3e095636be0228f;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08

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
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index 000000000..d304dc279
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+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/handler/DiagramSelection.java
@@ -0,0 +1,129 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.diagram.handler;
+
+import java.awt.geom.Point2D;
+import java.lang.ref.WeakReference;
+import java.util.Collections;
+import java.util.Set;
+
+import org.simantics.db.Resource;
+import org.simantics.g2d.canvas.ICanvasContext;
+import org.simantics.g2d.element.IElement;
+import org.simantics.utils.strings.EString;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public class DiagramSelection {
+
+    public static final DiagramSelection EMPTY = new DiagramSelection((Resource) null);
+
+    // Reference may be null
+    private final WeakReference<ICanvasContext> sourceCanvas;
+    private final Resource source;
+
+    /**
+     * May be empty or at least invalid after the source canvas no longer
+     * exists. Should not be used for anything besides visualisation.
+     */
+    private transient final Set<IElement> elements;
+
+    private final ElementObjectAssortment assortment;
+    private final boolean cut;
+    private final Point2D copyPos;
+
+    private DiagramSelection(Resource source) {
+        this.sourceCanvas = null;
+        this.source = source;
+        this.elements = Collections.emptySet();
+        this.assortment = ElementObjectAssortment.fromElements(elements);
+        this.cut = false;
+        this.copyPos = new Point2D.Double();
+    }
+
+    public DiagramSelection(ICanvasContext sourceCanvas, Resource source, Set<IElement> elements, boolean cut, Point2D copyPos) {
+        assert source != null;
+        assert elements != null;
+
+        this.sourceCanvas = new WeakReference<ICanvasContext>(sourceCanvas);
+        this.source = source;
+        this.elements = Collections.unmodifiableSet(elements);
+        this.assortment = ElementObjectAssortment.fromElements(elements);
+        this.cut = cut;
+        this.copyPos = copyPos;
+    }
+
+    /**
+     * @return <code>null</code> if the source canvas has already been disposed.
+     */
+    public ICanvasContext getSourceCanvas() {
+        ICanvasContext ctx = sourceCanvas == null ? null : sourceCanvas.get();
+        return ctx == null ? null : ctx.isDisposed() ? null : ctx;
+    }
+
+    public boolean isFromCanvasContext(ICanvasContext ctx) {
+        ICanvasContext srcCtx = getSourceCanvas();
+        return ctx != null && ctx == srcCtx;
+    }
+
+    public Resource getSourceDiagram() {
+        return source;
+    }
+
+    public boolean isCut() {
+        return cut;
+    }
+
+    public Point2D getCopyPos() {
+        return copyPos;
+    }
+
+    public Set<IElement> getOriginalElements() {
+        return elements;
+    }
+
+    public ElementObjectAssortment getAssortment() {
+        return assortment;
+    }
+
+    public boolean isEmpty() {
+        return getAssortment().isEmpty();
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("Diagram selection of ");
+        sb.append(elements.size());
+        sb.append(" element(s) ");
+        if (cut)
+            sb.append("cut");
+        else
+            sb.append("copied");
+        sb.append(" from ");
+        sb.append(source);
+        sb.append(" with reference position ");
+        sb.append(copyPos);
+        if (elements != null && !elements.isEmpty()) {
+            sb.append(":\n");
+            String elems = EString.implode(elements, "\n");
+            if (elems != null)
+                sb.append(EString.addPrefix(elems, "\t"));
+        }
+        if (assortment != null && !assortment.isEmpty()) {
+            sb.append(assortment.toString());
+        }
+        return sb.toString();
+    }
+}
+