1 files changed, 76 insertions, 0 deletions
diff --git a/plugins/uml/diagram/org.eclipse.papyrus.uml.diagram.sequence/custom-src/org/eclipse/papyrus/uml/diagram/sequence/edit/policies/InteractionOperandResizePolicy.java b/plugins/uml/diagram/org.eclipse.papyrus.uml.diagram.sequence/custom-src/org/eclipse/papyrus/uml/diagram/sequence/edit/policies/InteractionOperandResizePolicy.java
new file mode 100644
index 00000000000..697cb8611da
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+++ b/plugins/uml/diagram/org.eclipse.papyrus.uml.diagram.sequence/custom-src/org/eclipse/papyrus/uml/diagram/sequence/edit/policies/InteractionOperandResizePolicy.java
@@ -0,0 +1,76 @@
+/*****************************************************************************
+ * Copyright (c) 2018 CEA LIST, EclipseSource and others.
+ *
+ * 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:
+ *   EclipseSource - Initial API and implementation
+ *
+ *****************************************************************************/
+
+package org.eclipse.papyrus.uml.diagram.sequence.edit.policies;
+
+import org.eclipse.draw2d.IFigure;
+import org.eclipse.draw2d.PositionConstants;
+import org.eclipse.draw2d.geometry.Dimension;
+import org.eclipse.gef.commands.Command;
+import org.eclipse.gef.commands.UnexecutableCommand;
+import org.eclipse.gef.editpolicies.ResizableEditPolicy;
+import org.eclipse.gef.requests.ChangeBoundsRequest;
+
+/**
+ * The resize policy for InteractionOperands.
+ *
+ * @since 5.1
+ */
+public class InteractionOperandResizePolicy extends ResizableEditPolicy {
+
+	/**
+	 * The minimum height for the Operand. The policy will reject resize operations
+	 * if they would result in a smaller height
+	 */
+	public static final int MIN_HEIGHT = 5;
+
+	/**
+	 * The minimum width for the Operand. The policy will reject resize operations
+	 * if they would result in a smaller width
+	 */
+	public static final int MIN_WIDTH = 5;
+
+	/**
+	 * Disable drag and allow only south resize. {@inheritDoc}
+	 */
+	public InteractionOperandResizePolicy() {
+		super();
+		// Bug 533770: The layout is now handled exclusively by the parent.
+		// The operand is no longer directly resizable. It may still provide
+		// a height hint (Integer or Rectangle, height in pixels)
+		setResizeDirections(PositionConstants.NONE);
+		setDragAllowed(false);
+	}
+
+	@Override
+	protected Command getResizeCommand(ChangeBoundsRequest request) {
+		Dimension delta = new Dimension(request.getSizeDelta());
+		IFigure figure = getHostFigure();
+		if (figure != null) {
+			Dimension currentDimension = figure.getBounds().getSize();
+
+			// Take zoom into account; the request contains absolute mouse coordinates delta.
+			figure.translateToRelative(delta);
+			Dimension newDimension = currentDimension.expand(delta);
+			if (newDimension.width() < MIN_WIDTH || newDimension.height < MIN_HEIGHT) {
+				// XXX Currently we just reject the request. Ideally, we'd simply edit
+				// the request to match the min size. However, since this policy is typically
+				// called by the CF during its resize, we'd have to change that request, too. But we can't do that from here;
+				// so it's easier to just reject the request.
+				return UnexecutableCommand.INSTANCE;
+			}
+		}
+
+		return super.getResizeCommand(request);
+	}
+}