Java Swing: enable / disable all components in JPanel

Question

I have a JPanel that contains JToolbar (including several buttons without text) and JTable, and I need to enable / disable (to make internal widgets not clickable). I tried this:

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

but this doesn’t work. Is there a better and more general solution to enable / disable all internal components in JPanel?

I partially solved my problem with JLayer, starting with the example here http://docs.oracle.com/javase/tutorial/uiswing/misc/jlayer.html :

 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(); } } } 

I still have 2 problems:

1. In the link above, events apply only to the mouse. How can I manage keyboard events?

2. How to create a “shading” effect instead of blurring?

Answer 1

This requires a recursive call.

 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 2

I used the following function:

 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); } } 

Answer 3

you can overlay the whole Container / JComponent

• GlassPane block the default MouseEvents, but not the keyboard, you must use all the keywords from ToolKit

• JLayer (Java7) based on JXLayer (Java6)

• there are no reasons (reasons) why it does not work for you

 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 4

@Kesavamoorthi if you want to make it more general:

 void setPanelEnabled(java.awt.Container cont, Boolean isEnabled) { cont.setEnabled(isEnabled); java.awt.Component[] components = cont.getComponents(); for (int i = 0; i < components.length; i++) { if (components[i] instanceof java.awt.Container) { setPanelEnabled((java.awt.Container) components[i], isEnabled); } components[i].setEnabled(isEnabled); } }