X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.diagram%2Fsrc%2Forg%2Fsimantics%2Fdiagram%2Fparticipant%2FSGFocusParticipant.java;fp=bundles%2Forg.simantics.diagram%2Fsrc%2Forg%2Fsimantics%2Fdiagram%2Fparticipant%2FSGFocusParticipant.java;h=6adc34a57e524d24ec3aa1adcb831e89e6aae687;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/participant/SGFocusParticipant.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/participant/SGFocusParticipant.java
new file mode 100644
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+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/participant/SGFocusParticipant.java
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+/*******************************************************************************
+ * Copyright (c) 2007, 2013 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.participant;
+
+import java.awt.event.FocusEvent;
+import java.awt.event.FocusListener;
+
+import org.simantics.g2d.canvas.ICanvasContext;
+import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;
+import org.simantics.g2d.canvas.impl.DependencyReflection.Reference;
+import org.simantics.g2d.chassis.AWTChassis;
+import org.simantics.g2d.chassis.SWTChassis;
+
+/**
+ * The purpose of this participant is to properly handle contexts in Eclipse/SWT
+ * based deployments G2D canvases where it is possible that Eclipse eats input
+ * events based on UI contexts, key bindings, etc.
+ * 
+ * This participant depends on the {@link ContextUtil} canvas participant.
+ * 
+ * When some other scene graph component or UI Part, besides the root pane, gets focus,
+ * this participant will deactivate its {@link #contextId}. When the root pane gets the 
+ * focus back, it will restore {@link #contextId} to allow Eclipse key bindings
+ * for that {@link #contextId} to work properly. 
+ * 
+ * @see ContextUtil
+ * 
+ * @author J-P Laine
+ * @author Tuukka Lehtonen
+ * @author Teemu Lempinen
+ */
+public class SGFocusParticipant extends AbstractCanvasParticipant implements FocusListener {
+
+    @Reference
+    ContextUtil                 contextUtil;
+    
+    @Reference
+    org.simantics.diagram.participant.e4.ContextUtil e4ContextUtil;
+
+    final SWTChassis            chassis;
+    String                      contextId;
+    ContextState                originalContextState;
+
+    public SGFocusParticipant(SWTChassis chassis, String contextId) {
+        super();
+        this.chassis = chassis;
+        this.contextId = contextId;
+    }
+
+    @Override
+    public void addedToContext(ICanvasContext ctx) {
+        super.addedToContext(ctx);
+        chassis.getAWTComponent().addFocusListener(this);
+    }
+
+    @Override
+    public void removedFromContext(ICanvasContext ctx) {
+        if (!chassis.isDisposed()) {
+            AWTChassis component = chassis.getAWTComponent();
+            if (component != null)
+                component.removeFocusListener(this);
+        }
+        super.removedFromContext(ctx);
+    }
+
+    @Override
+    public void focusGained(FocusEvent e) {
+        ContextUtil util = contextUtil;
+        if (util != null) {
+            DiagramCommandBindings.activateBindings(util, contextId);
+        } else {
+            org.simantics.diagram.participant.e4.ContextUtil e4Util = e4ContextUtil;
+            if (e4Util != null) {
+                DiagramCommandBindings.activateBindings(e4Util, contextId);
+            }
+        }
+    }
+
+    @Override
+    public void focusLost(FocusEvent e) {
+        ContextUtil util = contextUtil;
+        if (util != null) {
+            DiagramCommandBindings.deactivateBindings(util, contextId);
+        } else {
+            org.simantics.diagram.participant.e4.ContextUtil e4Util = e4ContextUtil;
+            if (e4Util != null) {
+                DiagramCommandBindings.deactivateBindings(e4Util, contextId);
+            }
+        }
+    }
+
+}
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