Changeset 5543 for branches/OmeroEditor/src/treeModel/TreeUI.java

Timestamp:

07/17/08 16:32:21 (4 months ago)

Author:

will

Message:

Basically working JTree, with custom Rendering, Editing and Selection behavior

Files:

• branches/OmeroEditor/src/treeModel/TreeUI.java (modified) (4 diffs)

branches/OmeroEditor/src/treeModel/TreeUI.java

@@ -23 +23 @@
 package treeModel;
 
+//Java imports
+
 import java.awt.BorderLayout;
 
+import javax.swing.DefaultCellEditor;
 import javax.swing.JPanel;
 import javax.swing.JScrollPane;
 import javax.swing.JTree;
-
-//Java imports
+import javax.swing.tree.DefaultTreeCellEditor;
+import javax.swing.tree.DefaultTreeCellRenderer;
+import javax.swing.tree.TreeCellEditor;
 
 //Third-party libraries
@@ -35 +39 @@
 //Application-internal dependencies
 
+import fields.DefaultFieldEditor;
+
+
 /** 
+ * This UI class displays a JTree in a scroll pane. 
  * 
  *
@@ -49 +57 @@
         extends JPanel {
         
-        private TreeModel model;
-        
         private JTree tree;
         
@@ -56 +62 @@
                 
                 super(new BorderLayout());
-                
-                this.model = model;
+
                 
                 tree = new JTree(model);
+                /*
+                 * The default UI (BasicTreeUI) is replaced with a subclass
+                 * to modify the selection and editing behavior.
+                 */
+                tree.setUI(new MyBasicTreeUI());
+                
+                /*
+                 * A custom selection model allows multiple nodes to be selected,
+                 * but ensures that they are contiguous and are all siblings.
+                 */
                 tree.setSelectionModel(new ContiguousChildSelectionModel());
+                
+                /*
+                 * Setting the row height to 0 allows each node to choose it's
+                 * own size. The JTree will call getPreferredSize() for each.
+                 */
                 tree.setRowHeight(0);
-                tree.setCellRenderer(new FieldRenderer());
+                
+                /*
+                 * A custom TreeCellRenderer (extends DefaultTreeCellRenderer)
+                 * renders nodes as JPanels.
+                 */
+                DefaultTreeCellRenderer fieldRenderer = new FieldRenderer();
+                tree.setCellRenderer(fieldRenderer);
+                
+                /*
+                 * A TreeCellEditor for editing fields.
+                 * This merely delegates to the fieldRenderer because the same 
+                 * components are used for display and editing of the tree Cells.
+                 */
+                TreeCellEditor fieldEditor = new DefaultFieldEditor(fieldRenderer);
+                /*
+                 * The DefaultTreeCellEditor (when passed a TreeCellEditor) uses this 
+                 * to switch between editing and display. 
+                 */
+            TreeCellEditor editor = new DefaultTreeCellEditor(tree, fieldRenderer, fieldEditor);
+            tree.setCellEditor(editor);
                 
                 tree.setEditable(true);
                 
+                /*
+                 * Place the JTree in a ScrollPane and add it to this panel. 
+                 */
                 JScrollPane treeScroller = new JScrollPane(tree);
-                
                 add(treeScroller, BorderLayout.CENTER);
         }
+
         
 }