Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.browsing.ui.swt / src / org / simantics / browsing / ui / swt / widgets / impl / SelectionListenerImpl.java

diff --git a/bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/widgets/impl/SelectionListenerImpl.java b/bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/widgets/impl/SelectionListenerImpl.java
new file mode 100644 (file)
index 0000000..89ebf21
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/widgets/impl/SelectionListenerImpl.java
@@ -0,0 +1,84 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2012 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.browsing.ui.swt.widgets.impl;\r
+\r
+import org.eclipse.jface.viewers.ISelection;\r
+import org.eclipse.swt.events.SelectionEvent;\r
+import org.eclipse.swt.events.SelectionListener;\r
+import org.simantics.db.WriteGraph;\r
+import org.simantics.db.common.request.WriteRequest;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.management.ISessionContext;\r
+import org.simantics.utils.ReflectionUtils;\r
+import org.simantics.utils.ui.ISelectionUtils;\r
+\r
+abstract public class SelectionListenerImpl<T> implements SelectionListener, Widget {\r
+\r
+       private ISessionContext context;\r
+       private Object lastInput = null;\r
+       \r
+    final private Class<?> clazz;\r
+       \r
+       public SelectionListenerImpl(ISessionContext context) {\r
+               this.context = context;\r
+        clazz = ReflectionUtils.getSingleParameterType(getClass());\r
+       }\r
+       \r
+       @Override\r
+       public void widgetDefaultSelected(SelectionEvent e) {\r
+               widgetSelected(e);\r
+       }\r
+       \r
+       @Override\r
+       public void widgetSelected(SelectionEvent e) {\r
+               \r
+               final Object input = lastInput;\r
+               \r
+               try {\r
+                   @SuppressWarnings("unchecked")\r
+            T single = (T) ISelectionUtils.filterSingleSelection((ISelection)input, clazz);\r
+                       beforeApply(single);\r
+                       \r
+                       context.getSession().syncRequest(new WriteRequest() {\r
+\r
+                               @SuppressWarnings("unchecked")\r
+                @Override\r
+                               public void perform(WriteGraph graph) throws DatabaseException {\r
+                                   graph.markUndoPoint();\r
+                                       T single = (T) ISelectionUtils.filterSingleSelection((ISelection)input, clazz);\r
+                                       apply(graph, single);\r
+                               }\r
+                               \r
+                       });\r
+               } catch (DatabaseException e1) {\r
+                       e1.printStackTrace();\r
+               }\r
+       }\r
+\r
+       @Override\r
+       public void setInput(ISessionContext context, Object parameter) {\r
+               this.context = context;\r
+               lastInput = parameter;\r
+       }\r
+       \r
+       public void beforeApply() {\r
+               \r
+       }\r
+       \r
+    public void beforeApply(T input) {\r
+        beforeApply();\r
+    }\r
+\r
+       abstract public void apply(WriteGraph graph, T input) throws DatabaseException;\r
+       \r
+}\r
+       
\ No newline at end of file