DefaultTreeCellRenderer Vererbung

[Polo488]

Hallo

ich habe mir folgendes Beispiel angeschaut
How to Use Trees (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)

Und folgende Klasse entwickelt

import java.awt.Component;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeCellRenderer;

// Für die TreeIcons
public class MyRenderer extends DefaultTreeCellRenderer {
	
    Icon DataBaseIcon;
    Icon TableIcon;
    Icon FieldIcon; 
	
    public MyRenderer(){
    	//DataBaseIcon = new ImageIcon("Icon/database-icon.png");
    	//TableIcon = new ImageIcon("Icon/Windows-Table-icon.png");
    	//FieldIcon = new ImageIcon("Icon/default-document-icon.png");
    }

    public Component getTreeCellRendererComponent( JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {

        super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
        CustomTreeItem Item =(CustomTreeItem)value;
        if(Item.getHierachie()== Global.TreeHierachie.DataBase){
        	//setIcon(DataBaseIcon);
        }
        if(Item.getHierachie()== Global.TreeHierachie.Table){
        	//setIcon(TableIcon);
        }
        if(Item.getHierachie()== Global.TreeHierachie.Field){
        	//setIcon(FieldIcon);
        }
        return this;
    }
}

was ist mein Fehler? Exception

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: ApplicationFrame$1 cannot be cast to CustomTreeItem
at MyRenderer.getTreeCellRendererComponent(MyRenderer.java:24)
at javax.swing.plaf.basic.BasicTreeUI$NodeDimensionsHandler.getNodeDimensions(Unknown Source)
at javax.swing.tree.AbstractLayoutCache.getNodeDimensions(Unknown Source)
at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.updatePreferredSize(Unknown Source)
at javax.swing.tree.VariableHeightLayoutCache.updateNodeSizes(Unknown Source)
at javax.swing.tree.VariableHeightLayoutCache.invalidateSizes(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI.setCellRenderer(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI$Handler.propertyChange(Unknown Source)
at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
at java.awt.Component.firePropertyChange(Unknown Source)
at javax.swing.JTree.setCellRenderer(Unknown Source)
at ApplicationFrame.initialize(ApplicationFrame.java:98)
at ApplicationFrame.<init>(ApplicationFrame.java:42)
at Application.StartApplicationFrame(Application.java:44)
at LoginDialog$2.actionPerformed(LoginDialog.java:169)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicRootPaneUI$Actions.actionPerformed(Unknown Source)
at javax.swing.SwingUtilities.notifyAction(Unknown Source)
at javax.swing.JComponent.processKeyBinding(Unknown Source)
at javax.swing.KeyboardManager.fireBinding(Unknown Source)
at javax.swing.KeyboardManager.fireKeyboardAction(Unknown Source)
at javax.swing.JComponent.processKeyBindingsForAllComponents(Unknown Source)
at javax.swing.JComponent.processKeyBindings(Unknown Source)
at javax.swing.JComponent.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

 

[SlaterB]

Object value dürfte der aktuell selektierte Node sein, im Renderer erwartest du, dass das ein CustomTreeItem ist,
dem ist aber nicht so, stattdessen kommt ein Objekt einer anonymen Klasse von ApplicationFrame,
diese Klasse wäre nun sehr interessant bzw. generell mehr Infos wie der Tree aufgebaut ist

 

[Polo488]

hier

	private DefaultMutableTreeNode buildTree(){
					
		    CustomTreeItem TreeItem = new CustomTreeItem( Application.LoginParameters[4], Global.TreeHierachie.DataBase );    
		    DefaultMutableTreeNode TreeModel = new DefaultMutableTreeNode(TreeItem){
			{
				ResultSet ResultQ = Application.MySqlHdl.getTabels();	
				DefaultMutableTreeNode node_1;
				  try {
						while( ResultQ.next()){
							CustomTreeItem TableItem = new CustomTreeItem(ResultQ.getString(1),Global.TreeHierachie.Table);
							node_1 = new DefaultMutableTreeNode(TableItem); 
							ResultSet ResultT = Application.MySqlHdl.getFields(ResultQ.getString(1));
							while( ResultT.next()){
								CustomTreeItem FieldItem = new CustomTreeItem(ResultT.getString(1) +" : "+ResultT.getString(2),Global.TreeHierachie.Field);
								FieldItem.SetCustom(ResultT.getString(1));
								node_1.add(new DefaultMutableTreeNode(FieldItem));
							}
							add(node_1);
						  }
					  } catch (SQLException e) {
						e.printStackTrace();
					  }
			}
		};
		return TreeModel;
	}

 

[Polo488]

Habe so mal in meiner MyRenderer klasse nachgeschaut

   if (value instanceof CustomTreeItem){
        	System.out.println("yes");
        }

und es kam nicht einmal yes^^ das ist zum weinen

 

[Michael...]

value ist ein DefaultMutableTreeNode, per getUserValue() am Knoten bekommst Du dann Dein Item.

 

[Polo488]

Danke mit getUserObject() geht es