Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.ui / src / org / simantics / ui / workbench / ContextUtil.java

diff --git a/bundles/org.simantics.ui/src/org/simantics/ui/workbench/ContextUtil.java b/bundles/org.simantics.ui/src/org/simantics/ui/workbench/ContextUtil.java
new file mode 100644 (file)
index 0000000..d68849f
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+++ b/bundles/org.simantics.ui/src/org/simantics/ui/workbench/ContextUtil.java
@@ -0,0 +1,60 @@
+/*******************************************************************************\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.ui.workbench;\r
+\r
+import org.eclipse.swt.events.FocusEvent;\r
+import org.eclipse.swt.events.FocusListener;\r
+import org.eclipse.swt.widgets.Control;\r
+import org.eclipse.ui.IWorkbenchSite;\r
+import org.eclipse.ui.contexts.IContextActivation;\r
+import org.eclipse.ui.contexts.IContextService;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public final class ContextUtil {\r
+\r
+    /**\r
+     * Associate a workbench context specified by id with the focus state of the specified control.\r
+     * \r
+     * @param site any workbench site\r
+     * @param control the control whose focus to track for context activation\r
+     * @param contextId the ID of the context to use\r
+     */\r
+    public static void associateContext(final IWorkbenchSite site, Control control, final String contextId) {\r
+        control.addFocusListener(new FocusListener() {\r
+            IContextActivation contextActivation;\r
+\r
+            IContextService getService() {\r
+                if (site == null)\r
+                    return null;\r
+                return (IContextService) site.getService(IContextService.class);\r
+            }\r
+\r
+            @Override\r
+            public void focusGained(FocusEvent e) {\r
+                IContextService contextService = getService();\r
+                String ctx = contextId;\r
+                if (contextService != null && ctx != null)\r
+                    contextActivation = contextService.activateContext(ctx);\r
+            }\r
+\r
+            @Override\r
+            public void focusLost(FocusEvent e) {\r
+                IContextService contextService = getService();\r
+                if (contextService != null && contextActivation != null)\r
+                    contextService.deactivateContext(contextActivation);\r
+            }\r
+        });\r
+    }\r
+\r
+}\r