Java GridBagLayout-如何使此单元格填充其下方的空间?
我正在用4个JPanel创建一个JFrame。使用GridBagLayout,我创建了三行两列,每列两个面板。通过将蓝色面板的单元格高度从1更改为2,我可以使其覆盖其下方的单元格。我想做同样的绿色面板,以填补它下面的空间。以下是我的代码当前生成的内容: 我尝试将绿色面板的gridheight更改为2,但结果是: 我是否错误地使用了GridBagLayout?这样做的适当方式是什么 这是我的密码:Java GridBagLayout-如何使此单元格填充其下方的空间?,java,swing,layout-manager,gridbaglayout,Java,Swing,Layout Manager,Gridbaglayout,我正在用4个JPanel创建一个JFrame。使用GridBagLayout,我创建了三行两列,每列两个面板。通过将蓝色面板的单元格高度从1更改为2,我可以使其覆盖其下方的单元格。我想做同样的绿色面板,以填补它下面的空间。以下是我的代码当前生成的内容: 我尝试将绿色面板的gridheight更改为2,但结果是: 我是否错误地使用了GridBagLayout?这样做的适当方式是什么 这是我的密码: import java.awt.Color; import java.awt.Container
import java.awt.Color;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Main {
public static void main(String[] args) {
JFrame frame = new JFrame();
addComponents(frame.getContentPane());
frame.setSize(800, 600);
frame.setVisible(true);
}
public static void addComponents(Container contentPane) {
contentPane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(3,3,3,3);
c.fill = GridBagConstraints.BOTH;
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 1;
c.gridheight = 2;
c.weightx = 1;
c.weighty = 0.85;
JPanel panel1 = new JPanel();
panel1.setBackground(Color.BLUE);
contentPane.add(panel1, c);
c.gridx = 0;
c.gridy = 2;
c.gridwidth = 1;
c.gridheight = 1;
c.weightx = 1.1;
c.weighty = 0.35;
JPanel panel2 = new JPanel();
panel2.setBackground(Color.YELLOW);
contentPane.add(panel2, c);
c.gridx = 1;
c.gridy = 0;
c.gridwidth = 1;
c.gridheight = 1;
c.weightx = 0.15;
c.weighty = 0.5;
JPanel panel3 = new JPanel();
panel3.setBackground(Color.RED);
contentPane.add(panel3, c);
c.gridx = 1;
c.gridy = 1;
c.gridwidth = 1;
c.gridheight = 1;
c.weightx = 0.38;
c.weighty = 0.5;
JPanel panel4 = new JPanel();
panel4.setBackground(Color.GREEN);
contentPane.add(panel4, c);
}
}
我创建了三行两列
实际上,您只有两行,因为您只添加网格值为0和1的组件。其中一个组件的gridheight为2不会创建新行
一种解决方案是使用嵌套面板
为蓝色和黄色组件创建面板。这将使用一列两行的GridBagLayout。然后为每个组件设置权重值,以获得所需的高度
然后,再次为红色和绿色组件创建第二个面板,其中包含一列和两行。重量将分别设置为0.5
最后,创建第三个面板,其中包含两列和一行。设置所需的权重X并将上述两个面板添加到此面板,然后将面板添加到框架
我创建了三行两列
实际上,您只有两行,因为您只添加网格值为0和1的组件。其中一个组件的gridheight为2不会创建新行
一种解决方案是使用嵌套面板
为蓝色和黄色组件创建面板。这将使用一列两行的GridBagLayout。然后为每个组件设置权重值,以获得所需的高度
然后,再次为红色和绿色组件创建第二个面板,其中包含一列和两行。重量将分别设置为0.5
最后,创建第三个面板,其中包含两列和一行。设置所需的权重X,并将上述两个面板添加到此面板,然后将面板添加到框架。如果第三列有三个单元格,每个单元格的行跨度为1,则布局开始按预期运行
import java.awt.*;
导入javax.swing.*;
导入javax.swing.border.EmptyBorder;
公共类另一个面板布局{
私有JComponent ui=null;
另一个面板布局(){
initUI();
}
public void initUI(){
如果(ui!=null){
返回;
}
ui=新的JPanel(新的BorderLayout(4,4));
ui.setboorder(新的空订单(4,4,4,4));
添加组件(ui);
}
公共void addComponents(容器内容窗格){
setLayout(新的GridBagLayout());
GridBagConstraints c=新的GridBagConstraints();
c、 插图=新插图(3,3,3,3);
c、 fill=GridBagConstraints.BOTH;
c、 gridx=0;
c、 gridy=0;
c、 网格宽度=1;
c、 网格高度=2;
c、 权重x=0.66;
c、 权重y=0.66;
JPanel panel1=新的JPanel();
添加标签(面板1,c);
镶板1.立根背景(颜色:青色);
contentPane.add(panel1,c);
c、 gridx=0;
c、 gridy=2;
c、 网格宽度=1;
c、 网格高度=1;
//c、 weightx=1.1;//逻辑?
c、 权重x=0.66;
c、 权重y=0.33;
JPanel panel2=新的JPanel();
添加标签(面板2,c);
镶板2.立根背景(颜色:黄色);
contentPane.add(panel2,c);
c、 gridx=1;
c、 gridy=0;
c、 网格宽度=1;
c、 网格高度=1;
c、 权重x=0.33;
c、 权重y=0.33;
JPanel panel3=新的JPanel();
添加标签(面板3,c);
镶板3.立根背景(颜色:红色);
contentPane.add(panel3,c);
c、 gridx=1;
c、 gridy=1;
c、 网格宽度=1;
c、 网格高度=2;
c、 权重x=0.33;
c、 权重y=0.66;
JPanel panel4=新的JPanel();
添加标签(面板4,c);
嵌板4.立根背景(颜色:绿色);
contentPane.add(panel4,c);
//黑客修复?
c、 gridx=2;
c、 gridy=0;
c、 网格宽度=1;
c、 网格高度=1;
c、 权重x=0.01;
c、 权重y=0.33;
JPanel panelH1=新的JPanel();
//添加标签(面板H1,c);
镶板1.背景(颜色为洋红色);
contentPane.add(panelH1,c);
c、 gridy=1;
JPanel panelH2=新的JPanel();
//addLabel(面板H2,c);
镶板H2.背景(颜色为洋红色);
contentPane.add(panelH2,c);
c、 gridy=2;
JPanel panelH3=新的JPanel();
//添加标签(面板H3,c);
镶板H3.背景(颜色为洋红色);
contentPane.add(panelH3,c);
}
专用void addLabel(JPanel面板、GridBagc){
添加(新的JLabel(约束字符串(gbc));
}
私有字符串constraintsToString(GridBagConstraints gbc){
StringBuilder sb=新的StringBuilder();
某人加上(“”);
sb.append(addrowtable(“Grid X”,gbc.gridx));
sb.append(addrowtable(“Grid Y”,gbc.Grid));
sb.追加(addrowtable(“权重X”,gbc.权重X));
sb.追加(addrowtable(“权重Y”,gbc.权重));
sb.append(addrowtable(“网格宽度”,gbc.gridwidth));
sb.append(addrowtable(“网格高度”,gbc.gridheight));
使某人返回字符串();
}
私有字符串AddRowtTable(字符串标签,双值){
StringBuilder sb=新的StringBuilder(“”);
某人附加(标签);
某人加上(“”);
附加(价值);
某人加上(“”);
使某人返回字符串();
}
公共JComponent getUI(){
返回用户界面;
}
公共静态void main(字符串[]args){
Runnable r=新的Runnable(){
@凌驾
公开募捐{
import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class AnotherFourPanelLayout {
private JComponent ui = null;
AnotherFourPanelLayout() {
initUI();
}
public void initUI() {
if (ui != null) {
return;
}
ui = new JPanel(new BorderLayout(4, 4));
ui.setBorder(new EmptyBorder(4, 4, 4, 4));
addComponents(ui);
}
public void addComponents(Container contentPane) {
contentPane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(3, 3, 3, 3);
c.fill = GridBagConstraints.BOTH;
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 1;
c.gridheight = 2;
c.weightx = 0.66;
c.weighty = 0.66;
JPanel panel1 = new JPanel();
addLabel(panel1, c);
panel1.setBackground(Color.CYAN);
contentPane.add(panel1, c);
c.gridx = 0;
c.gridy = 2;
c.gridwidth = 1;
c.gridheight = 1;
//c.weightx = 1.1; // logical?
c.weightx = 0.66;
c.weighty = 0.33;
JPanel panel2 = new JPanel();
addLabel(panel2, c);
panel2.setBackground(Color.YELLOW);
contentPane.add(panel2, c);
c.gridx = 1;
c.gridy = 0;
c.gridwidth = 1;
c.gridheight = 1;
c.weightx = 0.33;
c.weighty = 0.33;
JPanel panel3 = new JPanel();
addLabel(panel3, c);
panel3.setBackground(Color.RED);
contentPane.add(panel3, c);
c.gridx = 1;
c.gridy = 1;
c.gridwidth = 1;
c.gridheight = 2;
c.weightx = 0.33;
c.weighty = 0.66;
JPanel panel4 = new JPanel();
addLabel(panel4, c);
panel4.setBackground(Color.GREEN);
contentPane.add(panel4, c);
// hack to fix?
c.gridx = 2;
c.gridy = 0;
c.gridwidth = 1;
c.gridheight = 1;
c.weightx = 0.01;
c.weighty = 0.33;
JPanel panelH1 = new JPanel();
//addLabel(panelH1, c);
panelH1.setBackground(Color.MAGENTA);
contentPane.add(panelH1, c);
c.gridy = 1;
JPanel panelH2 = new JPanel();
//addLabel(panelH2, c);
panelH2.setBackground(Color.MAGENTA);
contentPane.add(panelH2, c);
c.gridy = 2;
JPanel panelH3 = new JPanel();
//addLabel(panelH3, c);
panelH3.setBackground(Color.MAGENTA);
contentPane.add(panelH3, c);
}
private void addLabel(JPanel panel, GridBagConstraints gbc) {
panel.add(new JLabel(constraintsToString(gbc)));
}
private String constraintsToString(GridBagConstraints gbc) {
StringBuilder sb = new StringBuilder();
sb.append("<html><table>");
sb.append(addRowToTable("Grid X", gbc.gridx));
sb.append(addRowToTable("Grid Y", gbc.gridy));
sb.append(addRowToTable("Weight X", gbc.weightx));
sb.append(addRowToTable("Weight Y", gbc.weighty));
sb.append(addRowToTable("Grid Width", gbc.gridwidth));
sb.append(addRowToTable("Grid Height", gbc.gridheight));
return sb.toString();
}
private String addRowToTable(String label, double value) {
StringBuilder sb = new StringBuilder("<tr><td>");
sb.append(label);
sb.append("</td><td>");
sb.append(value);
sb.append("</td></tr>");
return sb.toString();
}
public JComponent getUI() {
return ui;
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception useDefault) {
}
AnotherFourPanelLayout o = new AnotherFourPanelLayout();
JFrame f = new JFrame(o.getClass().getSimpleName());
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f.setLocationByPlatform(true);
f.setContentPane(o.getUI());
f.pack();
f.setMinimumSize(f.getSize());
f.setVisible(true);
}
};
SwingUtilities.invokeLater(r);
}
}