+/*******************************************************************************\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.utils;\r
+\r
+import java.util.function.Supplier;\r
+\r
+import org.simantics.g2d.canvas.Hints;\r
+import org.simantics.g2d.canvas.ICanvasContext;\r
+import org.simantics.g2d.diagram.DiagramHints;\r
+import org.simantics.g2d.diagram.IDiagram;\r
+import org.simantics.scenegraph.g2d.events.command.Command;\r
+import org.simantics.scenegraph.g2d.events.command.CommandEvent;\r
+import org.simantics.scenegraph.g2d.events.command.Commands;\r
+import org.simantics.utils.threads.IThreadWorkQueue;\r
+import org.simantics.utils.threads.ThreadUtils;\r
+\r
+/**\r
+ * @author Toni Kalajainen\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class CanvasUtils {\r
+\r
+ /**\r
+ * Enqueue a command in the event queue of the specified canvas context.\r
+ * \r
+ * @param ctx queue context\r
+ * @param commandId ID of the command to queue\r
+ * \r
+ * @see #sendCommand(ICanvasContext, Command)\r
+ */\r
+ public static void sendCommand(ICanvasContext ctx, String commandId)\r
+ {\r
+ sendCommand(ctx, new Command(commandId));\r
+ }\r
+\r
+ /**\r
+ * Enqueue a command in the event queue of the specified canvas context.\r
+ * \r
+ * @param ctx queue context\r
+ * @param cmd the command to queue\r
+ */\r
+ public static void sendCommand(ICanvasContext ctx, Command cmd)\r
+ {\r
+ CommandEvent e = new CommandEvent(ctx, System.currentTimeMillis(), cmd);\r
+ ctx.getEventQueue().queueEvent(e);\r
+ }\r
+\r
+ /**\r
+ * A utility for scheduling a zoom-to-fit operation when an Eclipse\r
+ * workbench editor is initially opened.\r
+ * \r
+ * <p>\r
+ * There are two asynchronous calls, first into the workbench (SWT) UI\r
+ * thread and then into the canvas context thread. This will guarantee that\r
+ * the parenting SWT control has been resized to its actual size instead of\r
+ * the initial (0,0) size which widgets start out at. In order to perform a\r
+ * zoom-to-fit operation we simply have to know the bounds of the parenting\r
+ * control. Thus, we need to ensure that this information is available and\r
+ * correct.\r
+ * \r
+ * @param swtThread\r
+ * @param disposed\r
+ * @param canvasContext\r
+ * @param diagramToFit\r
+ */\r
+ public static void scheduleZoomToFit(IThreadWorkQueue swtThread, final Supplier<Boolean> disposed,\r
+ final ICanvasContext canvasContext, final IDiagram diagramToFit)\r
+ {\r
+ scheduleZoomToFit(swtThread, disposed, canvasContext, diagramToFit, true);\r
+ }\r
+\r
+ /**\r
+ * A utility for scheduling a zoom-to-fit operation when an Eclipse\r
+ * workbench editor is initially opened.\r
+ * \r
+ * <p>\r
+ * There are two asynchronous calls, first into the workbench (SWT) UI\r
+ * thread and then into the canvas context thread. This will guarantee that\r
+ * the parenting SWT control has been resized to its actual size instead of\r
+ * the initial (0,0) size which widgets start out at. In order to perform a\r
+ * zoom-to-fit operation we simply have to know the bounds of the parenting\r
+ * control. Thus, we need to ensure that this information is available and\r
+ * correct.\r
+ * \r
+ * @param swtThread\r
+ * @param disposed\r
+ * @param canvasContext\r
+ * @param diagramToFit\r
+ * @param zoomToFit\r
+ */\r
+ public static void scheduleZoomToFit(IThreadWorkQueue swtThread, final Supplier<Boolean> disposed,\r
+ final ICanvasContext canvasContext, final IDiagram diagramToFit, boolean zoomToFit)\r
+ {\r
+ if (diagramToFit == null)\r
+ throw new IllegalStateException("source diagram is null");\r
+\r
+ Boolean canvasZoomToFit = canvasContext.getHintStack().getHint(DiagramHints.KEY_INITIAL_ZOOM_TO_FIT);\r
+ diagramToFit.setHint(Hints.KEY_DISABLE_PAINTING, Boolean.TRUE);\r
+ if (zoomToFit && !Boolean.FALSE.equals(canvasZoomToFit))\r
+ diagramToFit.setHint(DiagramHints.KEY_INITIAL_ZOOM_TO_FIT, Boolean.TRUE);\r
+\r
+ ThreadUtils.asyncExec(swtThread, new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ if (disposed.get() || canvasContext.isDisposed())\r
+ return;\r
+\r
+ ThreadUtils.asyncExec(canvasContext.getThreadAccess(), new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ if (disposed.get() || canvasContext.isDisposed())\r
+ return;\r
+\r
+ Boolean zoomToFit = diagramToFit.removeHint(DiagramHints.KEY_INITIAL_ZOOM_TO_FIT);\r
+ diagramToFit.removeHint(Hints.KEY_DISABLE_PAINTING);\r
+\r
+ if (Boolean.TRUE.equals(zoomToFit))\r
+ CanvasUtils.sendCommand(canvasContext, Commands.ZOOM_TO_FIT);\r
+ CanvasUtils.sendCommand(canvasContext, Commands.ENABLE_PAINTING);\r
+ }\r
+ });\r
+ }\r
+ });\r
+ }\r
+\r
+}\r