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<code=java>/*
+
Gewöhnlich wenn ein Knoten selektiert ist, hebt JTree nur den Text hervor:
* TreeLineselection.java
+
 
*
+
[[Datei:TreeSelection.jpg]]
* Normally, when a node is selected, the tree marks only the text.
+
 
* This shows one way to mark the whole selected line in a JTree.
+
Hier wird eine Möglichkeit gezeigt, die ganze selektierte Zeile in einem JTree hervorzuheben:
*/
+
 
 +
[[Datei:TreeLineselection.jpg]]
  
import java.awt.*;
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<syntaxhighlight lang="java">
import java.awt.event.*;
 
 
import javax.swing.*;
 
import javax.swing.*;
import javax.swing.event.*;
 
import javax.swing.tree.*;
 
  
public class TreeLineselection extends JFrame {
+
public class LineTreeDemo {
  
 
     final private JTree tree;
 
     final private JTree tree;
  
     public TreeLineselection() {
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     public LineTreeDemo() {
         super("Tree Lineselection");
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         JFrame frame = new JFrame("Tree Lineselection");
         setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
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         frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
         setSize(400, 300);
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         frame.setSize(400, 300);
         setLocationRelativeTo(null);
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         frame.setLocationRelativeTo(null);
         tree = new MyTree();
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         tree = new LineTree();
         add(new JScrollPane(tree));
+
         frame.add(new JScrollPane(tree));
 +
        frame.setVisible(true);
 
     }
 
     }
  
 
     public static void main(final String args[]) throws Exception {
 
     public static void main(final String args[]) throws Exception {
         new TreeLineselection().setVisible(true);
+
         new LineTreeDemo();
 
     }
 
     }
 
}
 
}
 +
</syntaxhighlight>
  
class MyTree extends JTree {
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<syntaxhighlight lang="java">
 
+
/*
 +
* LineTree.java
 +
*
 +
* Normally, when a node is selected, the tree marks only the text.
 +
* This shows one way to mark the whole selected line in a JTree.
 +
*/
 +
 +
import java.awt.*;
 +
import java.awt.event.*;
 +
import javax.swing.*;
 +
import javax.swing.event.*;
 +
import javax.swing.tree.*;
 +
 +
 +
public class LineTree extends JTree {
 +
 
     final private Color SELECTION_COLOR = new Color(180, 210, 230, 90);
 
     final private Color SELECTION_COLOR = new Color(180, 210, 230, 90);
 
     private Rectangle selectedRowBounds;
 
     private Rectangle selectedRowBounds;
 
     private boolean expand;//allows the MouseListener to detect "handles" action (->no row selection)
 
     private boolean expand;//allows the MouseListener to detect "handles" action (->no row selection)
 
+
     public MyTree() {
+
     public LineTree() {
 
         //Set the selection mode:
 
         //Set the selection mode:
 
         selectionModel.setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
 
         selectionModel.setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
Zeile 46: Zeile 61:
 
         //Add the TreeSelectionListener:
 
         //Add the TreeSelectionListener:
 
         selectionModel.addTreeSelectionListener(new TreeSelectionListener() {
 
         selectionModel.addTreeSelectionListener(new TreeSelectionListener() {
 
+
 +
            @Override
 
             public void valueChanged(final TreeSelectionEvent e) {
 
             public void valueChanged(final TreeSelectionEvent e) {
 
                 paintSelectionRect();
 
                 paintSelectionRect();
Zeile 53: Zeile 69:
 
         //Add the TreeExpansionListener:
 
         //Add the TreeExpansionListener:
 
         addTreeExpansionListener(new TreeExpansionListener() {
 
         addTreeExpansionListener(new TreeExpansionListener() {
 
+
 +
            @Override
 
             public void treeCollapsed(final TreeExpansionEvent event) {
 
             public void treeCollapsed(final TreeExpansionEvent event) {
 
                 paintSelectionRect();
 
                 paintSelectionRect();
 
                 expand = true;
 
                 expand = true;
 
             }
 
             }
 
+
 +
            @Override
 
             public void treeExpanded(final TreeExpansionEvent event) {
 
             public void treeExpanded(final TreeExpansionEvent event) {
 
                 paintSelectionRect();
 
                 paintSelectionRect();
Zeile 66: Zeile 84:
 
         //Add MouseListener if you want to listen to whole line width:
 
         //Add MouseListener if you want to listen to whole line width:
 
         addMouseListener(new MouseAdapter() {
 
         addMouseListener(new MouseAdapter() {
 
+
 
             @Override
 
             @Override
 
             public void mousePressed(final MouseEvent e) {
 
             public void mousePressed(final MouseEvent e) {
Zeile 84: Zeile 102:
 
             }
 
             }
 
         });
 
         });
 
+
 
     }
 
     }
 
     //This method is called in valueChanged, treeCollapsed and treeExpanded
 
     //This method is called in valueChanged, treeCollapsed and treeExpanded
 
     //to paint the selection rectangle:
 
     //to paint the selection rectangle:
 
+
 
     private void paintSelectionRect() {
 
     private void paintSelectionRect() {
 
         //Get selected row bounds:
 
         //Get selected row bounds:
Zeile 99: Zeile 117:
 
         repaint();
 
         repaint();
 
     }
 
     }
 
+
 
     //Override paintComponent of JTree:
 
     //Override paintComponent of JTree:
 
     @Override
 
     @Override
Zeile 113: Zeile 131:
 
     }
 
     }
 
}
 
}
</code=java>
+
</syntaxhighlight>
 
[[Kategorie:Java]]
 
[[Kategorie:Java]]
 
[[Kategorie:Swing]]
 
[[Kategorie:Swing]]
 
[[Kategorie:Java-Codeschnipsel]]
 
[[Kategorie:Java-Codeschnipsel]]

Aktuelle Version vom 8. März 2020, 14:56 Uhr

Gewöhnlich wenn ein Knoten selektiert ist, hebt JTree nur den Text hervor:

TreeSelection.jpg

Hier wird eine Möglichkeit gezeigt, die ganze selektierte Zeile in einem JTree hervorzuheben:

TreeLineselection.jpg

import javax.swing.*;

public class LineTreeDemo {

    final private JTree tree;

    public LineTreeDemo() {
        JFrame frame = new JFrame("Tree Lineselection");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setSize(400, 300);
        frame.setLocationRelativeTo(null);
        tree = new LineTree();
        frame.add(new JScrollPane(tree));
        frame.setVisible(true);
    }

    public static void main(final String args[]) throws Exception {
        new LineTreeDemo();
    }
}
/*
 * LineTree.java
 *
 * Normally, when a node is selected, the tree marks only the text.
 * This shows one way to mark the whole selected line in a JTree.
 */
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
 
 
public class LineTree extends JTree {
 
    final private Color SELECTION_COLOR = new Color(180, 210, 230, 90);
    private Rectangle selectedRowBounds;
    private boolean expand;//allows the MouseListener to detect "handles" action (->no row selection)
 
    public LineTree() {
        //Set the selection mode:
        selectionModel.setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
        //Adapt the default selection colors:
        DefaultTreeCellRenderer renderer = (DefaultTreeCellRenderer) getCellRenderer();
        renderer.setTextSelectionColor(Color.BLACK);
        renderer.setBorderSelectionColor(Color.WHITE);
        renderer.setBackgroundSelectionColor(Color.WHITE);
        //Add the TreeSelectionListener:
        selectionModel.addTreeSelectionListener(new TreeSelectionListener() {
 
            @Override
            public void valueChanged(final TreeSelectionEvent e) {
                paintSelectionRect();
            }
        });
        //Add the TreeExpansionListener:
        addTreeExpansionListener(new TreeExpansionListener() {
 
            @Override
            public void treeCollapsed(final TreeExpansionEvent event) {
                paintSelectionRect();
                expand = true;
            }
 
            @Override
            public void treeExpanded(final TreeExpansionEvent event) {
                paintSelectionRect();
                expand = true;
            }
        });
        //Add MouseListener if you want to listen to whole line width:
        addMouseListener(new MouseAdapter() {
 
            @Override
            public void mousePressed(final MouseEvent e) {
                if (!expand) {
                    int row = getClosestRowForLocation(e.getX(), e.getY());
                    if (e.getClickCount() == 2) {
                        if (isCollapsed(row)) {
                            expandRow(row);
                        } else {
                            collapseRow(row);
                        }
                    } else {
                        setSelectionRow(row);
                    }
                }
                expand = false;
            }
        });
 
    }
    //This method is called in valueChanged, treeCollapsed and treeExpanded
    //to paint the selection rectangle:
 
    private void paintSelectionRect() {
        //Get selected row bounds:
        int[] rows = getSelectionRows();
        if (rows == null) {
            return;
        }
        selectedRowBounds = getRowBounds(rows[0]);
        //Repaint the JTree:
        repaint();
    }
 
    //Override paintComponent of JTree:
    @Override
    public void paintComponent(final Graphics g) {
        super.paintComponent(g);
        if (selectedRowBounds == null) {
            return;
        }
        //Set selection Color:
        g.setColor(SELECTION_COLOR);
        //Draw selection rectangle using the width of JTree:
        g.fillRect(0, (int) selectedRowBounds.getY(), getWidth(), (int) selectedRowBounds.getHeight());
    }
}