Java Swing: Aktivieren/Deaktivieren aller Komponenten in JPanel

Question

Ich habe eine JPanel, die eine JToolbar enthält (einschließlich einiger Tasten ohne Text) und eine JTable und ich muss aktivieren/deaktivieren (machen interne Widgets nicht anklickbar). Ich habe das versucht:

JPanel panel = ....; 
for (Component c : panel.getComponents()) c.setEnabled(enabled); 

aber es funktioniert nicht. Gibt es eine bessere und allgemeinere Lösung, um alle internen Komponenten in einem JPanel zu aktivieren/deaktivieren?

ich teilweise mein Problem mit JLayer aus dem Beispiel hier http://docs.oracle.com/javase/tutorial/uiswing/misc/jlayer.html Ausgangs gelöst haben:

layer = new JLayer<JComponent>(myPanel, new BlurLayerUI(false)); 
..... 
((BlurLayerUI)layer.getUI()).blur(...); // switch blur on/off 


class BlurLayerUI extends LayerUI<JComponent> { 
    private BufferedImage mOffscreenImage; 
    private BufferedImageOp mOperation; 

    private boolean blur; 

    public BlurLayerUI(boolean blur) { 
     this.blur = blur; 
     float ninth = 1.0f/9.0f; 
     float[] blurKernel = { 
      ninth, ninth, ninth, 
      ninth, ninth, ninth, 
      ninth, ninth, ninth 
     }; 
     mOperation = new ConvolveOp(
       new Kernel(3, 3, blurKernel), 
       ConvolveOp.EDGE_NO_OP, null); 
     } 

    public void blur(boolean blur) { 
     this.blur=blur; 
    firePropertyChange("blur", 0, 1); 
    } 

    @Override 
    public void paint (Graphics g, JComponent c) { 
     if (!blur) { 
      super.paint (g, c); 
      return; 
     } 

     int w = c.getWidth(); 
    int h = c.getHeight(); 



    if (w == 0 || h == 0) { 
     return; 
    } 

    // Only create the offscreen image if the one we have 
    // is the wrong size. 
    if (mOffscreenImage == null || 
      mOffscreenImage.getWidth() != w || 
      mOffscreenImage.getHeight() != h) { 
     mOffscreenImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); 
    } 

    Graphics2D ig2 = mOffscreenImage.createGraphics(); 
    ig2.setClip(g.getClip()); 
    super.paint(ig2, c); 
    ig2.dispose(); 

    Graphics2D g2 = (Graphics2D)g; 
    g2.drawImage(mOffscreenImage, mOperation, 0, 0); 
    } 

    @Override 
    public void applyPropertyChange(PropertyChangeEvent pce, JLayer l) { 
    if ("blur".equals(pce.getPropertyName())) { 
     l.repaint(); 
    } 
    } 

} 

Ich habe noch zwei Probleme:

1) In den obigen Link Ereignisse beziehen sich auf die Maus nur. Wie kann ich die Tastaturereignisse verwalten?

2) Wie kann ich einen "Grau-out" -Effekt anstelle von Unschärfe erzeugen?

Answer 1

können Sie ganze Overlay Container/JComponent

1. GlassPane Block standardmäßig Mausevents, aber nicht Tastatur, verbrauchen erforderlich alle keyevents von ToolKit

2. JLayer (Java7), basierend auf JXLayer (Java6)

3. kann nicht Grund sehen, warum funktioniert nicht für Sie

import java.awt.Color; 
import java.awt.Component; 
import java.awt.Dimension; 
import java.awt.GridLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JButton; 
import javax.swing.JCheckBox; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.border.LineBorder; 

public class AddComponentsAtRuntime { 

    private JFrame f; 
    private JPanel panel; 
    private JCheckBox checkValidate, checkReValidate, checkRepaint, checkPack; 

    public AddComponentsAtRuntime() { 
     JButton b = new JButton(); 
     //b.setBackground(Color.red); 
     b.setBorder(new LineBorder(Color.black, 2)); 
     b.setPreferredSize(new Dimension(600, 20)); 
     panel = new JPanel(new GridLayout(0, 1)); 
     panel.add(b); 
     f = new JFrame(); 
     f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     f.add(panel, "Center"); 
     f.add(getCheckBoxPanel(), "South"); 
     f.setLocation(200, 200); 
     f.pack(); 
     f.setVisible(true); 
    } 

    private JPanel getCheckBoxPanel() { 
     checkValidate = new JCheckBox("validate"); 
     checkValidate.setSelected(false); 
     checkReValidate = new JCheckBox("revalidate"); 
     checkReValidate.setSelected(true); 
     checkRepaint = new JCheckBox("repaint"); 
     checkRepaint.setSelected(true); 
     checkPack = new JCheckBox("pack"); 
     checkPack.setSelected(true); 
     JButton addComp = new JButton("Add New One"); 
     addComp.addActionListener(new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       JButton b = new JButton(); 
       //b.setBackground(Color.red); 
       b.setBorder(new LineBorder(Color.black, 2)); 
       b.setPreferredSize(new Dimension(400, 10)); 
       panel.add(b); 
       makeChange(); 
       System.out.println(" Components Count after Adds :" + panel.getComponentCount()); 
      } 
     }); 
     JButton removeComp = new JButton("Remove One"); 
     removeComp.addActionListener(new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       int count = panel.getComponentCount(); 
       if (count > 0) { 
        panel.remove(0); 
       } 
       makeChange(); 
       System.out.println(" Components Count after Removes :" + panel.getComponentCount()); 
      } 
     }); 
     JButton disabledComp = new JButton("Disabled All"); 
     disabledComp.addActionListener(new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       for (Component c : panel.getComponents()) { 
        c.setEnabled(false); 
       } 
      } 
     }); 
     JButton enabledComp = new JButton("Enabled All"); 
     enabledComp.addActionListener(new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       for (Component c : panel.getComponents()) { 
        c.setEnabled(true); 
       } 
      } 
     }); 
     JPanel panel2 = new JPanel(); 
     panel2.add(checkValidate); 
     panel2.add(checkReValidate); 
     panel2.add(checkRepaint); 
     panel2.add(checkPack); 
     panel2.add(addComp); 
     panel2.add(removeComp); 
     panel2.add(disabledComp); 
     panel2.add(enabledComp); 
     return panel2; 
    } 

    private void makeChange() { 
     if (checkValidate.isSelected()) { 
      panel.validate(); 
     } 
     if (checkReValidate.isSelected()) { 
      panel.revalidate(); 
     } 
     if (checkRepaint.isSelected()) { 
      panel.repaint(); 
     } 
     if (checkPack.isSelected()) { 
      f.pack(); 
     } 
    } 

    public static void main(String[] args) { 
     AddComponentsAtRuntime makingChanges = new AddComponentsAtRuntime(); 
    } 
} 

Answer 2

Es erfordert einen rekursiven Aufruf.

import java.awt.*; 
import javax.swing.*; 

public class DisableAllInContainer { 

    public void enableComponents(Container container, boolean enable) { 
     Component[] components = container.getComponents(); 
     for (Component component : components) { 
      component.setEnabled(enable); 
      if (component instanceof Container) { 
       enableComponents((Container)component, enable); 
      } 
     } 
    } 

    DisableAllInContainer() { 
     JPanel gui = new JPanel(new BorderLayout()); 

     final JPanel container = new JPanel(new BorderLayout()); 
     gui.add(container, BorderLayout.CENTER); 

     JToolBar tb = new JToolBar(); 
     container.add(tb, BorderLayout.NORTH); 
     for (int ii=0; ii<3; ii++) { 
      tb.add(new JButton("Button")); 
     } 

     JTree tree = new JTree(); 
     tree.setVisibleRowCount(6); 
     container.add(new JScrollPane(tree), BorderLayout.WEST); 

     container.add(new JTextArea(5,20), BorderLayout.CENTER); 

     final JCheckBox enable = new JCheckBox("Enable", true); 
     enable.addActionListener(new ActionListener(){ 
      @Override 
      public void actionPerformed(ActionEvent ae) { 
       enableComponents(container, enable.isSelected()); 
      } 
     }); 
     gui.add(enable, BorderLayout.SOUTH); 

     JOptionPane.showMessageDialog(null, gui); 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable(){ 
      @Override 
      public void run() { 
       new DisableAllInContainer(); 
      } 
     }); 
    }} 

Answer 3

habe ich die folgende Funktion:

void setPanelEnabled(JPanel panel, Boolean isEnabled) { 
    panel.setEnabled(isEnabled); 

    Component[] components = panel.getComponents(); 

    for(int i = 0; i < components.length; i++) { 
     if(components[i].getClass().getName() == "javax.swing.JPanel") { 
      setPanelEnabled((JPanel) components[i], isEnabled); 
     } 

     components[i].setEnabled(isEnabled); 
    } 
}