From bb30ad4f8e8a27d005fd4775a539d836e2cb4084 Mon Sep 17 00:00:00 2001
From: Ansgar Radermacher
Date: Tue, 18 Jul 2017 17:46:34 +0200
Subject: Bug 519107 - [All diagrams] model opening is slow, if multiple
 diagrams are open

- Delay diagram initialization until diagram gets focus, show busy cursor while diagram is initialized

Signed-off-by: Ansgar Radermacher <ansgar.radermacher@cea.fr>
---
 .../diagram/common/part/UmlGmfDiagramEditor.java   | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/plugins/uml/diagram/org.eclipse.papyrus.uml.diagram.common/src/org/eclipse/papyrus/uml/diagram/common/part/UmlGmfDiagramEditor.java b/plugins/uml/diagram/org.eclipse.papyrus.uml.diagram.common/src/org/eclipse/papyrus/uml/diagram/common/part/UmlGmfDiagramEditor.java
index df76d78fa31..72d7d380169 100644
--- a/plugins/uml/diagram/org.eclipse.papyrus.uml.diagram.common/src/org/eclipse/papyrus/uml/diagram/common/part/UmlGmfDiagramEditor.java
+++ b/plugins/uml/diagram/org.eclipse.papyrus.uml.diagram.common/src/org/eclipse/papyrus/uml/diagram/common/part/UmlGmfDiagramEditor.java
@@ -29,7 +29,9 @@ import org.eclipse.papyrus.infra.internationalization.common.editor.IInternation
 import org.eclipse.papyrus.infra.internationalization.utils.utils.LabelInternationalization;
 import org.eclipse.papyrus.infra.internationalization.utils.utils.LabelInternationalizationUtils;
 import org.eclipse.papyrus.infra.ui.lifecycleevents.ISaveAndDirtyService;
+import org.eclipse.swt.custom.BusyIndicator;
 import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Display;
 import org.eclipse.ui.contexts.IContextService;
 
 /**
@@ -57,6 +59,13 @@ public class UmlGmfDiagramEditor extends SynchronizableGmfDiagramEditor implemen
 	 */
 	private ServicesRegistry servicesRegistry;
 
+	/**
+	 * boolean indicating whether the viewer has already been initialized.
+	 * Used for lazy initialization (wait, until set Focus is called) to reduce opening time
+	 * of Papyrus editor.
+	 */
+	protected boolean viewerInitialized = false;
+
 	/**
 	 * Constructor.
 	 *
@@ -80,6 +89,42 @@ public class UmlGmfDiagramEditor extends SynchronizableGmfDiagramEditor implemen
 		// account.
 		ISaveAndDirtyService saveAndDirtyService = servicesRegistry.getService(ISaveAndDirtyService.class);
 		saveAndDirtyService.registerIsaveablePart(this);
+		viewerInitialized = false;
+	}
+
+	/**
+	 * Override to initialize viewer, if it gets in focus
+	 *
+	 * @see org.eclipse.papyrus.infra.gmfdiag.common.SynchronizableGmfDiagramEditor#setFocus()
+	 */
+	@Override
+	public void setFocus() {
+		if (!viewerInitialized) {
+			BusyIndicator.showWhile(Display.getDefault(), new Runnable(){
+
+				public void run(){
+					doInitializeGraphicalViewer();
+					viewerInitialized = true;
+				}
+			});
+		}
+		super.setFocus();
+	}
+
+	/**
+	 * Initialize the graphical viewer (calls superclass)
+	 */
+	protected void doInitializeGraphicalViewer() {
+		super.initializeGraphicalViewer();
+	}
+
+	/**
+	 * @generated
+	 */
+	@Override
+	protected void initializeGraphicalViewer() {
+		// do nothing to enable a lazy initialization.
+		// initialization is done, if setFocus is called.
 	}
 
 	/**
-- 
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