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GridBagLayout网格高度约束不影响结果

layout-manager jpanel layout swing java

Sebiancoder · 技术社区 · 7 年前

我正在使用GRIDBACK布局工作在JavaSwing项目上。我正在尝试制作两个宽度相同、水平对齐但高度不同的面板。

像这样:

我有以下代码:

import javax.swing.*;
导入Java.AWT.*;

公共类超扩展JFrame{

公共静态void main(string[]args){

新的mega();

}

公共mega()。{

Dimension MinDimension=新Dimension();
mindimension.width=800;
mindimension.height=800;

this.setDefaultCloseOperation(jframe.exit在关闭时退出);

jpanel mainpanel=new jpanel();
mainpanel.setlayout(new gridBagLayout());
this.add(主面板);

gridBagConstraints constraints=new gridBagConstraints();

jpanel toppanel=new jpanel();
Toppanel.Background(彩色、灰色);

constraints.gridx=0;
constraints.gridy=0;
constraints.gridwidth=1;
constraints.gridheight=1;
constraints.weightx=1;
constraints.weighty=1;
constraints.insets=新插入(5、5、5、5);
constraints.anchor=gridBagConstraints.page_start;
constraints.fill=网格约束.both;
mainpanel.add(Toppanel,约束);

jpanel bottomppanel=new jpanel();
底部面板。退台(颜色。绿色);

constraints.gridx=0;
constraints.gridy=1;
constraints.gridwidth=1;
constraints.gridheight=3;
constraints.weightx=1;
constraints.weighty=1;
constraints.insets=新插入(5、5、5、5);
constraints.anchor=gridbagconstraints.page_end;
constraints.fill=网格约束.both;
mainpanel.add(底部面板,约束);

此.setVisible(真);

}

}
使用此代码,底部面板的高度应该是第一个面板的三倍,因为它占用三行,而顶部面板只占用一行。但是,我得到的看起来像这样。




因为两个面板的高度相同,所以网格高度=3约束看起来并没有什么不同。我做错什么了?

这样地:


我有以下代码:

import javax.swing.*;
import java.awt.*;

public class Mega extends JFrame {

    public static void main(String[] args) {

        new Mega();

    }

    public Mega() {

        Dimension minDimension = new Dimension();
        minDimension.width = 800;
        minDimension.height = 800;

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel mainPanel = new JPanel();
        mainPanel.setLayout(new GridBagLayout());
        this.add(mainPanel);

        GridBagConstraints constraints = new GridBagConstraints();

        JPanel topPanel = new JPanel();
        topPanel.setBackground(Color.GRAY);

        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.gridwidth = 1;
        constraints.gridheight = 1;
        constraints.weightx = 1;
        constraints.weighty = 1;
        constraints.insets = new Insets(5, 5, 5, 5);
        constraints.anchor = GridBagConstraints.PAGE_START;
        constraints.fill = GridBagConstraints.BOTH;
        mainPanel.add(topPanel, constraints);

        JPanel bottomPanel = new JPanel();
        bottomPanel.setBackground(Color.GREEN);

        constraints.gridx = 0;
        constraints.gridy = 1;
        constraints.gridwidth = 1;
        constraints.gridheight = 3;
        constraints.weightx = 1;
        constraints.weighty = 1;
        constraints.insets = new Insets(5, 5, 5, 5);
        constraints.anchor = GridBagConstraints.PAGE_END;
        constraints.fill = GridBagConstraints.BOTH;
        mainPanel.add(bottomPanel, constraints);

        this.setVisible(true);

    }

}


使用此代码,底部面板的高度应该是第一个面板的三倍,因为它占用三行,而顶部面板只占用一行。但是,我得到的看起来像这样。



因为两个面板的高度相同,所以网格高度=3约束看起来并没有什么不同。我做错什么了?

1 回复 | 直到 7 年前

MadProgrammer 7 年前

gridheight 不会有任何影响,因为没有更多的行可供它展开(想想 gridwidth and gridheight as“expand across”),相反,要么从组件中提供更好的大小调整提示,要么使用 weighty 属性进行播放。


   
    
     
      
       
      
     
     import java.awt.color;
导入java.awt.dimension;
导入java.awt.eventqueue;
导入java.awt.gridbagConstraints;
导入java.awt.gridbaglayout;
导入java.awt.insets;
导入javax.swing.jframe;
导入javax.swing.jpanel;

公共类超扩展JFrame{

公共静态void main(string[]args){
eventQueue.invokelater(new runnable()){
@覆盖
public void run()。{
新的mega();
}
})(二)

}

公共mega()。{
this.setDefaultCloseOperation(jframe.exit在关闭时退出);

jpanel mainpanel=new jpanel()。{
//这样做是为了演示
//对于子组件更好
//提供适当的大小调整提示
@覆盖
公共维度getPreferredSize()。{
返回新尺寸(800、800);
}
}(二)
mainpanel.setlayout(new gridBagLayout());
this.add(主面板);

gridBagConstraints constraints=new gridBagConstraints();

jpanel toppanel=new jpanel();
Toppanel.Background(彩色、灰色);

constraints.gridx=0;
constraints.gridy=0;
constraints.weightx=1;
constraints.weighty=0.25;
constraints.gridwidth=1;
constraints.fill=网格约束.both;
constraints.insets=新插入(5、5、5、5);
mainpanel.add(Toppanel,约束);

jpanel bottomppanel=new jpanel();
底部面板。退台(颜色。绿色);

constraints.gridy=1;
constraints.weighty=0.75;
mainpanel.add(底部面板,约束);

pack();
setLocationRelativeTo(空);
此.setVisible(真);

}

}
第网格高度作为“扩展”),或者从组件中提供更好的大小调整提示,或者使用weighty财产



import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Mega extends JFrame {

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Mega();
            }
        });

    }

    public Mega() {
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel mainPanel = new JPanel() {
            // This is done for demonstration purposes
            // it would be better for the child components
            // to provide appropriate sizing hints
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(800, 800);
            }
        };
        mainPanel.setLayout(new GridBagLayout());
        this.add(mainPanel);

        GridBagConstraints constraints = new GridBagConstraints();

        JPanel topPanel = new JPanel();
        topPanel.setBackground(Color.GRAY);

        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.weightx = 1;
        constraints.weighty = 0.25;
        constraints.gridwidth = 1;
        constraints.fill = GridBagConstraints.BOTH;
        constraints.insets = new Insets(5, 5, 5, 5);
        mainPanel.add(topPanel, constraints);

        JPanel bottomPanel = new JPanel();
        bottomPanel.setBackground(Color.GREEN);

        constraints.gridy = 1;
        constraints.weighty = 0.75;
        mainPanel.add(bottomPanel, constraints);

        pack();
        setLocationRelativeTo(null);
        this.setVisible(true);

    }

}