[英]Java Swing: Enabling/Disabling all components in JPanel
I have a JPanel which contains a JToolbar (including few buttons without text) and a JTable and I need to enable/disable (make internal widgets not clickable). 我有一个JPanel,其中包含一个JToolbar(包括几个没有文本的按钮)和一个JTable,我需要启用/禁用(使内部小部件不可点击)。 I tried this:
我试过这个:
JPanel panel = ....;
for (Component c : panel.getComponents()) c.setEnabled(enabled);
but it doesn't work. 但它不起作用。 Is there a better and more generic solution to enable/disable all internal components in a JPanel?
是否有更好,更通用的解决方案来启用/禁用JPanel中的所有内部组件?
I have partially solved my problem using JLayer starting from the example here http://docs.oracle.com/javase/tutorial/uiswing/misc/jlayer.html : 我从http://docs.oracle.com/javase/tutorial/uiswing/misc/jlayer.html的示例开始,使用JLayer部分解决了我的问题:
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: 我还有两个问题:
In the link above events are relative to mouse only. 在上面的链接中,事件仅与鼠标相关。 How can I manage the keyboard events?
如何管理键盘事件?
How can I create a "gray out" effect in place of blur? 如何创建“灰色”效果代替模糊?
It requires a recursive call. 它需要递归调用。
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();
}
});
}}
I used the following function: 我使用了以下功能:
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);
}
}
you can overlay whole Container / JComponent
你可以覆盖整个
Container / JComponent
GlassPane
block by default MouseEvents, but not Keyboard, required consume all keyevents from ToolKit GlassPane
块默认情况下需要MouseEvents而不是Keyboard,它会占用ToolKit中的所有键事件
JLayer
(Java7) based on JXLayer
(Java6) JLayer
(Java7)基于JXLayer
(Java6)
can't see reason(s) why not works for you 看不出原因为什么不适合你
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();
}
}
@Kesavamoorthi if you want to make it more general: @Kesavamoorthi如果你想让它更通用:
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);
}
}
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