我希望能够隐藏JProgressBar并使其所在的面板不会改变大小.
目前,当我将进度条设置为visible(via pb.setVisible(true))时,我得到如下布局:
然后,当我将其设置为不可见时,我得到以下布局:
显然强制JPanel是一个特定的大小并没有帮助.
在JProgressBar上设置显式大小似乎没有帮助.
使用NetBean的GUI编辑器中的垂直间隙进行修改似乎没有帮助(我将其设置为固定大小).
我想我在这里很容易丢失一些东西,我看不出它是什么.
如何强制隐藏的JProgressBar仍然占用房地产(特别是垂直房地产)？
代码在下面,因为它的价值.我对错过的概念比代码的细节更感兴趣.:-)
package pbtest;
public class MyFrame extends javax.swing.JFrame {
public MyFrame() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
//
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
pb = new javax.swing.JProgressBar();
bnVis = new javax.swing.JButton();
bnInvis = new javax.swing.JButton();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBorder(javax.swing.BorderFactory.createEtchedBorder());
bnVis.setText("Visible");
bnVis.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bnVisActionPerformed(evt);
}
});
bnInvis.setText("Not Visible");
bnInvis.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bnInvisActionPerformed(evt);
}
});
jButton1.setText("Some Other Random Component");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(19, 19, 19)
.addComponent(pb, javax.swing.GroupLayout.PREFERRED_SIZE, 217, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(45, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addComponent(bnVis)
.addGap(28, 28, 28)
.addComponent(bnInvis)
.addGap(47, 47, 47))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addComponent(jButton1)
.addGap(30, 30, 30))))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(20, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(bnInvis)
.addComponent(bnVis))
.addGap(4, 4, 4)
.addComponent(pb, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton1))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(22, Short.MAX_VALUE)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(64, Short.MAX_VALUE))
);
pack();
}//
private void bnVisActionPerformed(java.awt.event.ActionEvent evt) {
pb.setVisible(true);
}
private void bnInvisActionPerformed(java.awt.event.ActionEvent evt) {
pb.setVisible(false);
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new MyFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton bnInvis;
private javax.swing.JButton bnVis;
private javax.swing.JButton jButton1;
private javax.swing.JPanel jPanel1;
private javax.swing.JProgressBar pb;
// End of variables declaration
}
选项:将其放在JPanel中,使用CardLayout将视图交换进出.你可以用一个空的JLabel交换它.该CardLayout -使用的JPanel将在大小所需的最大尺寸,显示所有交换的组件.然后在要显示JProgressBar的位置添加CardLayout-using JPanel.
以您的代码为例(虽然我讨厌GroupLayout):
import java.awt.CardLayout;
import javax.swing.JLabel;
import javax.swing.JPanel;
@SuppressWarnings("serial")
public class MyFrame extends javax.swing.JFrame {
private static final String PROGRESS_BAR = "progress bar";
private static final String EMPTY = "empty";
public MyFrame() {
initComponents();
}
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
pb = new javax.swing.JProgressBar();
bnVis = new javax.swing.JButton();
bnInvis = new javax.swing.JButton();
jButton1 = new javax.swing.JButton();
//!!
cardLayout = new CardLayout();
cardHolderPanel = new JPanel(cardLayout);
cardHolderPanel.add(pb, PROGRESS_BAR);
cardHolderPanel.add(new JLabel(), EMPTY);
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBorder(javax.swing.BorderFactory.createEtchedBorder());
bnVis.setText("Visible");
bnVis.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bnVisActionPerformed(evt);
}
});
bnInvis.setText("Not Visible");
bnInvis.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bnInvisActionPerformed(evt);
}
});
jButton1.setText("Some Other Random Component");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(jPanel1Layout
.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
jPanel1Layout
.createSequentialGroup()
.addGap(19, 19, 19)
.addComponent(cardHolderPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 217,
javax.swing.GroupLayout.PREFERRED_SIZE).addContainerGap(45, Short.MAX_VALUE))
.addGroup(
javax.swing.GroupLayout.Alignment.TRAILING,
jPanel1Layout
.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(
jPanel1Layout
.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
javax.swing.GroupLayout.Alignment.TRAILING,
jPanel1Layout.createSequentialGroup().addComponent(bnVis)
.addGap(28, 28, 28).addComponent(bnInvis)
.addGap(47, 47, 47))
.addGroup(
javax.swing.GroupLayout.Alignment.TRAILING,
jPanel1Layout.createSequentialGroup().addComponent(jButton1)
.addGap(30, 30, 30)))));
jPanel1Layout.setVerticalGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
javax.swing.GroupLayout.Alignment.TRAILING,
jPanel1Layout
.createSequentialGroup()
.addContainerGap(20, Short.MAX_VALUE)
.addGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(bnInvis).addComponent(bnVis))
.addGap(4, 4, 4)
.addComponent(cardHolderPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 35,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton1)));
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(
javax.swing.GroupLayout.Alignment.TRAILING,
layout.createSequentialGroup()
.addContainerGap(22, Short.MAX_VALUE)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap()));
layout.setVerticalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(
layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(64, Short.MAX_VALUE)));
pack();
}//
private void bnVisActionPerformed(java.awt.event.ActionEvent evt) {
// pb.setVisible(true);
cardLayout.show(cardHolderPanel, PROGRESS_BAR);
}
private void bnInvisActionPerformed(java.awt.event.ActionEvent evt) {
// pb.setVisible(false); // !!
cardLayout.show(cardHolderPanel, EMPTY);;
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new MyFrame().setVisible(true);
}
});
}
private javax.swing.JButton bnInvis;
private javax.swing.JButton bnVis;
private javax.swing.JButton jButton1;
private javax.swing.JPanel jPanel1;
private CardLayout cardLayout;
private JPanel cardHolderPanel;
private javax.swing.JProgressBar pb;
}
如果这是我的项目,我会考虑为此创建一个类,比如说SwappingComponent,它看起来像这样:
import java.awt.CardLayout;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
public @SuppressWarnings("serial")
class SwappingComponent extends JPanel {
private static final String SHOW = "show";
private static final String HIDE = "hide";
JComponent component;
CardLayout cardLayout = new CardLayout();
public SwappingComponent(JComponent component) {
setLayout(cardLayout);
this.component = component;
add(component, SHOW);
add(new JLabel(), HIDE);
}
public JComponent getComponent() {
return component;
}
public void showComponent(boolean show) {
String key = show ? SHOW : HIDE;
cardLayout.show(this, key);
}
}
我可以这样使用它:
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.border.Border;
@SuppressWarnings("serial")
public class MyGui2 extends JPanel {
private JProgressBar progressBar = new JProgressBar(0, 100);
private SwappingComponent swappingComponent = new SwappingComponent(progressBar);
public MyGui2() {
progressBar.setStringPainted(true);
int delay = 100;
new Timer(delay, new ActionListener() {
private int value = 0;
@Override
public void actionPerformed(ActionEvent e) {
progressBar.setValue(value);
if (value >= 100) {
value = 0;
} else {
value += 2;
value = Math.min(value, 100);
}
}
}).start();
JPanel northPanel = new JPanel(new GridLayout(1, 0, 5, 5));
northPanel.add(new JButton(new ShowAction("Show")));
northPanel.add(new JButton(new HideAction("Hide")));
JPanel southPanel = new JPanel();
southPanel.add(new JButton("Some Component"));
Border outsideBorder = BorderFactory.createEmptyBorder(15, 15, 15, 15);
Border insideBorder = BorderFactory.createEtchedBorder();
Border border = BorderFactory.createCompoundBorder(outsideBorder, insideBorder);
setBorder(border);
setLayout(new BorderLayout(6, 6));
add(swappingComponent, BorderLayout.CENTER);
add(northPanel, BorderLayout.PAGE_START);
add(southPanel, BorderLayout.PAGE_END);
}
private class ShowAction extends AbstractAction {
public ShowAction(String name) {
super(name);
putValue(MNEMONIC_KEY, (int) name.charAt(0));
}
@Override
public void actionPerformed(ActionEvent e) {
swappingComponent.showComponent(true);
}
}
private class HideAction extends AbstractAction {
public HideAction(String name) {
super(name);
putValue(MNEMONIC_KEY, (int) name.charAt(0));
}
@Override
public void actionPerformed(ActionEvent e) {
swappingComponent.showComponent(false);
}
}
private static void createAndShowGui() {
JFrame frame = new JFrame("MyGui2");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new MyGui2());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
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