我正在尝试使用GridBagLayout创建JDialog，但是我无法以自己想要的方式进行操作。我是否使用了错误的布局模型？我的代码是：
import java.awt.Dialog;
import java.awt.Dialog;
import java.awt.GridBagLayout;
import java.text.NumberFormat;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class alertDialog {
JDialog dialog=null;
private GridBagLayout layout=new GridBagLayout();
private NumberFormat tempFormat = NumberFormat.getIntegerInstance();
public alertDialog(String type_,TimelineRecord timeLine_) {
dialog=new JDialog();
dialog.setTitle("Alert");
dialog.setSize(600, 200);
dialog.setLayout(layout);
dialog.setModalityType(Dialog.ModalityType.MODELESS);
dialog.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
Monitor mon=timeLine_.monitor;
int row=1;
JLabel msg=new JLabel();
if (type_.equals("Temperature")) {
msg.setText(mon.getName()+" temperature has been reached");
}
else {
msg.setText(type_);
}
JButton dismiss=new JButton("Dismiss");
dismiss.addActionListener(new delayButton(timeLine_,dialog));
JButton delay5=new JButton("Delay 5 Minutes");
delay5.addActionListener(new delayButton(5,timeLine_,dialog));
JButton delay10=new JButton("Delay 10 Minutes");
delay10.addActionListener(new delayButton(10,timeLine_,dialog));
JButton delay15=new JButton("Delay 15 Minutes");
delay15.addActionListener(new delayButton(15,timeLine_,dialog));
dialog.add(msg,makeGbc(0,row++));
dialog.add(dismiss,makeGbc(1,row++));
if (mon!=null) {
JLabel currentTemp=new JLabel("Current Temperature");
JLabel newTarget=new JLabel("New Target");
JFormattedTextField temp=new JFormattedTextField(tempFormat);
temp.setText(Double.toString(mon.current));
JFormattedTextField target=new JFormattedTextField(tempFormat);
target.setText(Double.toString(mon.target));
dialog.add(currentTemp,makeGbc(0,row));
dialog.add(temp,makeGbc(1,row));
dialog.add(newTarget,makeGbc(2,row));
dialog.add(target,makeGbc(3,row++));
}
dialog.add(delay5,makeGbc(0,row));
dialog.add(delay10,makeGbc(1,row));
dialog.add(delay15,makeGbc(2,row));
dialog.setVisible(true);
}
public static void main(String[] args) {
TimelineRecord timeline=new TimelineRecord();
new alertDialog("tod",timeline);
}
}
这是TimeLineRecord：
import java.util.Timer;
public class TimelineRecord {
// text of event to take place (Saved to XML)
public String eventText;
// time of day for alarm (Saved to XML)
public String tod;
// target temp for alarm (Saved to XML)
public double targetTemp;
// pit temp to change to (Saved to XML)
public double pitTemp;
// meat type
public String meat;
// weight of meat
public double weight;
// Average cook time for this probe in minutes (Saved to XML)
public long avgCookTime;
// total cook time in minutes
public long totalCookTime;
// associated monitor instance (ID saved to XML)
public Monitor monitor=null;
// associated pit probe instance (ID saved to XML)
public Monitor pit=null;
// timer for alarm instance
public Timer timer=null;
// actual time of event
public String actualTod;
// actual temp at event
public double actualTemp;
// actual pit temp at event
public double actualPitTemp;
// Method to set variables
public void setObject(String obj_,String value_) {
switch(obj_) {
case "eventText": eventText=value_;
break;
case "tod": tod=value_;
break;
case "targetTemp": if (!value_.equals("")) {
targetTemp=Double.parseDouble(value_);
}
break;
case "pitTemp": if (!value_.equals("")) {
pitTemp=Double.parseDouble(value_);
}
break;
case "meat": meat=value_;
break;
case "weight": if (!value_.equals("")) {
weight=Double.parseDouble(value_);
}
break;
}
}
}
听众：
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JDialog;
public class delayButton implements ActionListener {
private int delay=0;
private TimelineRecord timeLine=null;
private JDialog dialog=null;
public delayButton(int minutes_,TimelineRecord timeLine_,JDialog dialog_) {
delay=minutes_;
timeLine=timeLine_;
dialog=dialog_;
}
public delayButton(TimelineRecord timeLine_,JDialog dialog_) {
timeLine=timeLine_;
dialog=dialog_;
}
@Override
public void actionPerformed(ActionEvent arg0) {
if (delay==0) {
System.out.println("Got dismiss for "+timeLine.monitor.getName());
}
else {
System.out.println("Got "+Integer.toString(delay)+" minute delay for "+timeLine.monitor.getName());
}
dialog.dispose();
}
}
和GBC生成器：
public static GridBagConstraints makeGbc(int x, int y) {
GridBagConstraints gbc = new GridBagConstraints();
Insets WEST_INSETS=new Insets(5,0,5,5);
Insets EAST_INSETS=new Insets(5,5,5,0);
gbc.gridx = x;
gbc.gridy = y;
gbc.gridwidth = 1;
gbc.gridheight = 1;
gbc.anchor = (x == 0) ? GridBagConstraints.WEST : GridBagConstraints.EAST;
gbc.fill = (x == 0) ? GridBagConstraints.BOTH
: GridBagConstraints.HORIZONTAL;
gbc.insets = (x == 0) ? WEST_INSETS : EAST_INSETS;
gbc.weightx = (x == 0) ? 0.1 : 1.0;
gbc.weighty = 1.0;
return gbc;
}
第一行可以是任何长度，因此我希望将其基于长度居中。第二行上的按钮应居中。奇怪的是，最后一行中第一个按钮的高度不同于其他按钮。它们都应该相同。
最佳答案
尝试这个
import javax.swing.*;
import java.awt.*;
public class AlertDialog extends JDialog {
public AlertDialog(Frame owner) {
super(owner);
createGUI();
}
public AlertDialog(Dialog owner) {
super(owner);
createGUI();
}
private void createGUI() {
JLabel label = new JLabel("My Label");
JPanel topPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
topPanel.add(label);
JButton button = new JButton("Button");
JPanel centerPanel = new JPanel(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
centerPanel.add(button, c);
JButton button1 = new JButton("Button 1");
JButton button2 = new JButton("Button 2");
JButton button3 = new JButton("Button 3");
JPanel bottomPanel = new JPanel(new GridLayout(0, 3));
bottomPanel.add(button1);
bottomPanel.add(button2);
bottomPanel.add(button3);
setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
setLayout(new BorderLayout());
add(topPanel, BorderLayout.PAGE_START);
add(centerPanel, BorderLayout.CENTER);
add(bottomPanel, BorderLayout.PAGE_END);
pack();
setLocationRelativeTo(getParent());
}
}
和一个面板版本
import javax.swing.*;
import java.awt.*;
public class AlertDialog extends JDialog {
public AlertDialog(Frame owner) {
super(owner);
createGUI();
}
public AlertDialog(Dialog owner) {
super(owner);
createGUI();
}
private void createGUI() {
JLabel label = new JLabel("My Label");
JButton button = new JButton("Button");
JButton button1 = new JButton("Button 1");
JButton button2 = new JButton("Button 2");
JButton button3 = new JButton("Button 3");
setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 3;
add(label, c);
c.gridy++;
c.weightx = 1.0;
c.weighty = 1.0;
add(button, c);
c.gridy++;
c.gridwidth = 1;
c.weighty = 0.0;
c.fill = GridBagConstraints.HORIZONTAL;
add(button1, c);
c.gridx++;
add(button2, c);
c.gridx++;
add(button3, c);
pack();
setLocationRelativeTo(getParent());
}
}
在您的代码中，此按钮将调整最后一行上的第一个按钮的大小（x = 0）
gbc.fill = (x == 0) ? GridBagConstraints.BOTH
: GridBagConstraints.HORIZONTAL