Discussion :

[Dereck07]

Bonjour,

J'aimerais créer un Tree qui contient des check box et j'ai trouvé sur le net un bout de code que j'ai un peu modifié:

Code :

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import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.MouseEvent;
import java.io.File;
import java.util.EventObject;
import java.util.LinkedList;
import java.util.List;
import java.util.Vector;
 
import javax.swing.AbstractCellEditor;
import javax.swing.JCheckBox;
import javax.swing.JTree;
import javax.swing.UIManager;
import javax.swing.event.ChangeEvent;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeCellEditor;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
 
public class CheckBoxNodeTree {
    JTree tree;
 
 
    public CheckBoxNodeTree(String Path) { 
 
   CheckBoxNode REP[] = null;      
   File f =new File(Path);  
   if (f.exists())
    { 
 
    File[] files = f.listFiles();
        if (files != null) {
            int n=0;
            // Compte le nombre de fichier
            for (int i = 0; i < files.length; i++) {
                if (files[i].isDirectory() == false) { n=n+1;}
                }
 
            REP= new CheckBoxNode[n];
            int p=0;
            for (int i = 0; i < files.length; i++) {
                if (files[i].isDirectory() == true) {
                    //System.out.println("Dossier" + files[i].getAbsolutePath());
                } else {
                    //System.out.println("Fichier" + files[i].getName());
                    String Fname = files[i].getName();
                    Fname=Fname.substring(0,Fname.length()-4); // supression de l'extention ex: .txt
                    REP[p]=new CheckBoxNode(Fname, false);
                    ActionList.add(REP[p]);
                    p=p+1;
                }
            }
        }
        else
        {
        REP= new CheckBoxNode[0];
        REP[0]= new CheckBoxNode("empty",false);  
        } 
    }    
 
 
    Vector REPVector = new NamedVector("REP", REP);
    Object rootNodes[] = { REPVector };
    Vector rootVector = new NamedVector("Root", rootNodes);     
 
 
 
    tree = new JTree(rootVector);
 
    CheckBoxNodeRenderer renderer = new CheckBoxNodeRenderer();
    tree.setCellRenderer(renderer);
 
    tree.setCellEditor(new CheckBoxNodeEditor(tree));
    tree.setEditable(true); 
 
  }
 
}
 
class CheckBoxNodeRenderer implements TreeCellRenderer {
  private JCheckBox leafRenderer = new JCheckBox();
 
  private DefaultTreeCellRenderer nonLeafRenderer = new DefaultTreeCellRenderer();
 
  Color selectionBorderColor, selectionForeground, selectionBackground,
      textForeground, textBackground;
 
  protected JCheckBox getLeafRenderer() {
    return leafRenderer;
  }
 
  public CheckBoxNodeRenderer() {
    Font fontValue;
    fontValue = UIManager.getFont("Tree.font");
    if (fontValue != null) {
      leafRenderer.setFont(fontValue);
    }
    Boolean booleanValue = (Boolean) UIManager
        .get("Tree.drawsFocusBorderAroundIcon");
    leafRenderer.setFocusPainted((booleanValue != null)
        && (booleanValue.booleanValue()));
 
    selectionBorderColor = UIManager.getColor("Tree.selectionBorderColor");
    selectionForeground = UIManager.getColor("Tree.selectionForeground");
    selectionBackground = UIManager.getColor("Tree.selectionBackground");
    textForeground = UIManager.getColor("Tree.textForeground");
    textBackground = UIManager.getColor("Tree.textBackground");
  }
 
  public Component getTreeCellRendererComponent(JTree tree, Object value,
      boolean selected, boolean expanded, boolean leaf, int row,
      boolean hasFocus) {
 
    Component returnValue;
    if (leaf) {
 
      String stringValue = tree.convertValueToText(value, selected,
          expanded, leaf, row, false);
      leafRenderer.setText(stringValue);
      leafRenderer.setSelected(false);
 
      leafRenderer.setEnabled(tree.isEnabled());
 
      if (selected) {
        leafRenderer.setForeground(selectionForeground);
        leafRenderer.setBackground(selectionBackground);
      } else {
        leafRenderer.setForeground(textForeground);
        leafRenderer.setBackground(textBackground);
      }
 
      if ((value != null) && (value instanceof DefaultMutableTreeNode)) {
        Object userObject = ((DefaultMutableTreeNode) value)
            .getUserObject();
        if (userObject instanceof CheckBoxNode) {
          CheckBoxNode node = (CheckBoxNode) userObject;
          leafRenderer.setText(node.getText());
          leafRenderer.setSelected(node.isSelected());
        }
      }
      returnValue = leafRenderer;
    } else {
      returnValue = nonLeafRenderer.getTreeCellRendererComponent(tree,
          value, selected, expanded, leaf, row, hasFocus);
    }
    return returnValue;
  }
}
 
class CheckBoxNodeEditor extends AbstractCellEditor implements TreeCellEditor {
 
  CheckBoxNodeRenderer renderer = new CheckBoxNodeRenderer();
 
  ChangeEvent changeEvent = null;
 
  JTree tree;
 
  public CheckBoxNodeEditor(JTree tree) {
    this.tree = tree;
  }
 
  public Object getCellEditorValue() {
    JCheckBox checkbox = renderer.getLeafRenderer();
    CheckBoxNode checkBoxNode = new CheckBoxNode(checkbox.getText(),
        checkbox.isSelected());
    return checkBoxNode;
  }
 
  public boolean isCellEditable(EventObject event) {
    boolean returnValue = false;
    if (event instanceof MouseEvent) {
      MouseEvent mouseEvent = (MouseEvent) event;
      TreePath path = tree.getPathForLocation(mouseEvent.getX(),
          mouseEvent.getY());
      if (path != null) {
        Object node = path.getLastPathComponent();
        if ((node != null) && (node instanceof DefaultMutableTreeNode)) {
          DefaultMutableTreeNode treeNode = (DefaultMutableTreeNode) node;
          Object userObject = treeNode.getUserObject();
          returnValue = ((treeNode.isLeaf()) && (userObject instanceof CheckBoxNode));
        }
      }
    }
    return returnValue;
  }
 
  public Component getTreeCellEditorComponent(JTree tree, Object value,
      boolean selected, boolean expanded, boolean leaf, int row) {
 
    Component editor = renderer.getTreeCellRendererComponent(tree, value,
        true, expanded, leaf, row, true);
 
    // editor always selected / focused
    ItemListener itemListener = new ItemListener() {
      public void itemStateChanged(ItemEvent itemEvent) {
        if (stopCellEditing()) {
          fireEditingStopped();
        }
      }
    };
    if (editor instanceof JCheckBox) {
      ((JCheckBox) editor).addItemListener(itemListener);
    }
 
    return editor;
  }
}
 
class CheckBoxNode {
  String text;
  boolean selected;
 
  public CheckBoxNode(String text, boolean selected) {
    this.text = text;
    this.selected = selected;
  }
 
  public boolean isSelected() {
    return selected;
  }
 
  public void setSelected(boolean newValue) {
    selected = newValue;
  }
 
  public String getText() {
    return text;
  }
 
  public void setText(String newValue) {
    text = newValue;
  }
 
 
  public String toString() {
    return getClass().getName() + "[" + text + "/" + selected + "]";
  }
}
 
class NamedVector extends Vector {
  String name;
 
  public NamedVector(String name) {
    this.name = name;
  }
 
  public NamedVector(String name, Object elements[]) {
    this.name = name;
    for (int i = 0, n = elements.length; i < n; i++) {
      add(elements[i]);
    }
  }
 
  public String toString() {
    return "[" + name + "]";
  }
}

Exemple d'utilisation de la classe:

Code :

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   CheckBoxNodeTree C = new CheckBoxNodeTree(Path);   
   arbre =C.tree;
   arbre.expandRow(0);
   jScrollPane1.setViewportView(arbre);
   jScrollPane1.setVisible(true);

Ca fonctionne trés bien. Je vois apparaitre un tree contenant tous les fichiers contenu dans le repertoire Path et mon tree contien des check box que je peux cocher et décocher.

Le souci c'est que je n'arrive pas à accéder a l'etat du check box dans les divers noeuds...

J'ai créer un bout de code qui permet le parcourir les divers noeuds.

Code :

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     TreeNode root =  (TreeNode) arbre.getModel().getRoot();
     root = root.getChildAt(0);
     for (int i = 0; i < root.getChildCount(); i++)
	{
              if (root.getChildAt(i).isLeaf()) 
                    {
                    //CheckBoxNode t;
                    //t=root.getChildAt(i).getClass().????
                    System.out.println(root.getChildAt(i).toString());             }
		else {System.out.println("under");}
			
	}

J'arrrive à afficher des info en text d'un noeud, mais ce que je aimerais c'est recupère l'objet CheckBoxNode d'un Noeud.
Quelqu'un c'est comment faire ca ?

Dereck