java jinternalpanel_Java Swing:在JPanel中啟用/禁用所有組件

素颜马尾好姑娘i 2022-11-06 05:48 186阅读 0赞

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). I tried this:

我有一個JPanel，它包含一個JToolbar(包括幾個沒有文本的按鈕)和一個JTable，我需要啟用/禁用(使內部小部件不能單擊)。我試着這樣的:

JPanel panel = ....;

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

but it doesn't work. Is there a better and more generic solution to enable/disable all internal components in a JPanel?

但它不工作。是否有更好、更通用的解決方案來啟用/禁用JPanel中的所有內部組件?

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

我已經使用JLayer部分地解決了我的問題，這個例子從http://docs.oracle.com/javase/tutorial/uiswing/misc/jlayer.html開始:

layer = new JLayer(myPanel, new BlurLayerUI(false));

.....

((BlurLayerUI)layer.getUI()).blur(...); // switch blur on/off

class BlurLayerUI extends LayerUI \{

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

\};

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:

我還有兩個問題:

1) In the link above events are relative to mouse only. How can I manage the keyboard events?

1)以上鏈接中事件僅與鼠標相關。如何管理鍵盤事件?

2) How can I create a "gray out" effect in place of blur?

2)如何創建一個“灰色出來”效果來代替模糊效果?

3 个解决方案

\#1

It requires a recursive call.

它需要一個遞歸調用。

![a6a27880c01e91aab556a0439ee6f025.gif][]

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();

\});

\}\}

\#2

I used the following function:

我使用了以下函數:

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);

\#3

you can overlay whole Container / JComponent

您可以覆蓋整個容器/ JComponent

GlassPane block by default MouseEvents, but not Keyboard, required consume all keyevents from ToolKit

默認的MouseEvents，但不是鍵盤的GlassPane塊，需要從工具箱中消耗所有的keyevents。

JLayer (Java7) based on JXLayer (Java6)

JLayer (Java7)基於JXLayer (Java6)

can't see reason(s) why not works for you

不明白為什么不為你工作

![aHR0cHM6Ly9pLnN0YWNrLmltZ3VyLmNvbS9nclg1Zi5qcGc=][aHR0cHM6Ly9pLnN0YWNrLmltZ3VyLmNvbS9nclg1Zi5qcGc]

![c025520303bf831daa723bb70afb8777.png][]

![d886b9a40c8d8087f58ae92fd81a478d.png][]

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();

[a6a27880c01e91aab556a0439ee6f025.gif]: /images/20221023/f990958cd99b4ef495de00dac83334c4.png
[aHR0cHM6Ly9pLnN0YWNrLmltZ3VyLmNvbS9nclg1Zi5qcGc]: https://www.itdaan.com/go/aHR0cHM6Ly9pLnN0YWNrLmltZ3VyLmNvbS9nclg1Zi5qcGc=
[c025520303bf831daa723bb70afb8777.png]: /images/20221023/817d97033e584de1a29b0a5dd2c495a0.png
[d886b9a40c8d8087f58ae92fd81a478d.png]: /images/20221023/1f93b9bd94d6418bb259220382407a6e.png