GridBagLayout和GridBagConstraints的可配置项

GridBagLayout的可配置项

属性	功能
columnWidths	用int数组设置列的宽度, 0代表该列自动宽度 , 数组length并不代表列数
rowHeights	用int数组设置行的高度, 0代表该行自动高度 , 数组length并不代表行数
columnWeights	此字段包含对列权重的覆盖。如果此字段不为空，则在计算所有列权重后将值应用于网格包。如果 columnWeights[i] > 列 i 的权重，则为列 i 分配 columnWeights[i] 中的权重。如果 columnWeights 的元素多于列数，则忽略多余的元素 - 它们不会导致创建更多列。单位是以整个容器的宽度为1, 当只有一列时 , 1代表宽度占满容器 , 当有多列时 , 不会缩小其它列 . 最小也不会压缩子元素 , 所以取值基本是 0至1的浮点数
rowWeights	此字段保存对行权重的覆盖。如果此字段不为空，则在计算所有行权重后将值应用于网格包。如果 rowWeights[i] > 第 i 行的权重，则第 i 行被赋予 rowWeights[i] 中的权重。如果 rowWeights 的元素多于行数，则忽略多余的元素 - 它们不会导致创建更多行。

用 columnWidths 和 rowHeights 指定的是像素大小, 拖拽容器大小时, 不会跟随变化 , 可以指定大于容器的尺寸
用 columnWeights 和 rowWeights 指定的时相对容器的大小, 会随容器等比缩放, 不能设置大于容器的尺寸
可以4项都设置, 也可这4项都不设置
可以只设置weight, 而不设置width.height

GridBagConstraints的可配置项

    public GridBagConstraints () {gridx = RELATIVE;gridy = RELATIVE;gridwidth = 1;gridheight = 1;weightx = 0;weighty = 0;anchor = CENTER;fill = NONE;insets = new Insets(0, 0, 0, 0);ipadx = 0;ipady = 0;}

    public GridBagConstraints(int gridx, int gridy,int gridwidth, int gridheight,double weightx, double weighty,int anchor, int fill,Insets insets, int ipadx, int ipady) {this.gridx = gridx;this.gridy = gridy;this.gridwidth = gridwidth;this.gridheight = gridheight;this.fill = fill;this.ipadx = ipadx;this.ipady = ipady;this.insets = insets;this.anchor  = anchor;this.weightx = weightx;this.weighty = weighty;}

两者都不配置 , 不会换行

GridBagLayoutConstraints两者都不配置的默认2206100909

代码

package gridBagLayoutConstraints;
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;import javax.swing.*;
public class GridBagLayoutConstraints两者都不配置的默认2206100909 {static Frame frame = new Frame(Thread.currentThread().getStackTrace()[1].getClassName());static GridBagLayout gbl = new GridBagLayout();static ArrayList<JLabel> lbAl = new ArrayList<>();static {frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {frame.dispose();System.exit(0);}});frame.setBounds(100,50,1024,768); frame.setLayout(gbl);for(int r=0; r<10; r++)for(int c=0; c<10; c++) {JLabel jlb = new JLabel("JLabel-C"+c+"R"+r); jlb.setOpaque(true); jlb.setBackground(new Color(   (int) (Math.random()*256*256*256+1000000)  ));jlb.setFont(new Font(null, Font.ITALIC, 20) );frame.add(jlb);}}public static void main(String...arguments) {frame.setVisible(true);}}

效果

只配置GridBagLayout , 也不会换行

只配置columnWidths 和 rowHeights

都是是0

package gridBagLayoutConstraints;
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;import javax.swing.*;
public class 单独设置GridBagLayout {static Frame frame = new JFrame(Thread.currentThread().getStackTrace()[1].getClassName());static GridBagLayout gbl = new GridBagLayout();static ArrayList<JLabel> lbAl = new ArrayList<>();static {frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {frame.dispose();System.exit(0);}});frame.setBounds(100,50, 1024 , 768); frame.setLayout(gbl);gbl.columnWidths = new int[] {0, 0, 0};
//      gbl.columnWeights = new double[] {0.2 , 0.3 , 0.5 };gbl.rowHeights = new int[] { 0, 0, 0};
//      gbl.rowWeights = new double[] {0.5 , 0.2, 0.3 };for(int r=0; r<1; r++)for(int c=0; c<3; c++) {JLabel jlb = new JLabel("JLabel-C"+c+"R"+r); jlb.setOpaque(true); jlb.setBackground(new Color(   (int) (Math.random()*256*256)  ));jlb.setFont(new Font(null, Font.ITALIC, 20) );frame.add(jlb);}}public static void main(String...arguments) {frame.setVisible(true);}}

columnWidths = new int[] {100, 200, 300};

package gridBagLayoutConstraints;
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;import javax.swing.*;
public class 单独设置GridBagLayout {static Frame frame = new JFrame(Thread.currentThread().getStackTrace()[1].getClassName());static GridBagLayout gbl = new GridBagLayout();static ArrayList<JLabel> lbAl = new ArrayList<>();static {frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {frame.dispose();System.exit(0);}});frame.setBounds(100,50, 1024 , 768); frame.setLayout(gbl);gbl.columnWidths = new int[] {100, 200, 300};
//      gbl.columnWeights = new double[] {0.2 , 0.3 , 0.5 };gbl.rowHeights = new int[] { 0, 0, 0};
//      gbl.rowWeights = new double[] {0.5 , 0.2, 0.3 };for(int r=0; r<1; r++)for(int c=0; c<3; c++) {JLabel jlb = new JLabel("JLabel-C"+c+"R"+r); jlb.setOpaque(true); jlb.setBackground(new Color(   (int) (Math.random()*256*256)  ));jlb.setFont(new Font(null, Font.ITALIC, 20) );frame.add(jlb);}}public static void main(String...arguments) {frame.setVisible(true);}}

columnWidths = new int[] {0, 800, 200};

6个标签

10个标签

100个标签

只配置GridBagConstraints

单独设置GridBagConstraints2206111536

package gridBagLayoutConstraints;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class 单独设置GridBagConstraints2206111536 {static Frame frame = new JFrame(Thread.currentThread().getStackTrace()[1].getClassName());static {frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {frame.dispose();System.exit(0);}});frame.setLayout(new GridBagLayout()); frame.setBounds(100, 100, 1024, 768);GridBagConstraints gbc = new GridBagConstraints();
//      gbc.insets.left=6; gbc.insets.top=6;for(int r=0; r<5; r++)for(int c=0; c<5; c++) {JButton jb = new JButton("R"+r+"C"+c);gbc.gridx=c; gbc.gridy=r;frame.add(jb, gbc);}}public static  void main(String...arguments) {frame.setVisible(true);}
}

package gridBagLayoutConstraints;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class 单独设置GridBagConstraints2206111536 {static Frame frame = new JFrame(Thread.currentThread().getStackTrace()[1].getClassName());static {frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {frame.dispose();System.exit(0);}});frame.setLayout(new GridBagLayout()); frame.setBounds(100, 100, 1024, 768);GridBagConstraints gbc = new GridBagConstraints();gbc.insets.left=6; gbc.insets.top=6;for(int r=0; r<5; r++)for(int c=0; c<5; c++) {JButton jb = new JButton("R"+r+"C"+c);gbc.gridx=c; gbc.gridy=r;frame.add(jb, gbc);}}public static  void main(String...arguments) {frame.setVisible(true);}
}

package gridBagLayoutConstraints;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class 单独设置GridBagConstraints2206111536 {static Frame frame = new JFrame(Thread.currentThread().getStackTrace()[1].getClassName());static {frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {frame.dispose();System.exit(0);}});frame.setLayout(new GridBagLayout()); frame.setBounds(100, 100, 1024, 768);GridBagConstraints gbc = new GridBagConstraints();gbc.insets.left=6; gbc.insets.top=6;for(int r=0; r<5; r++)for(int c=0; c<5; c++) {JButton jb = new JButton("R"+r+"C"+c);if(r==2 || c==3)jb.setText(jb.getText()+"-延长看看");gbc.gridx=c; gbc.gridy=r;frame.add(jb, gbc);}}public static  void main(String...arguments) {frame.setVisible(true);}
}

package gridBagLayoutConstraints;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class 单独设置GridBagConstraints2206111536 {static Frame frame = new JFrame(Thread.currentThread().getStackTrace()[1].getClassName());static {frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {frame.dispose();System.exit(0);}});frame.setLayout(new GridBagLayout()); frame.setBounds(100, 100, 1024, 768);GridBagConstraints gbc = new GridBagConstraints();
//      gbc.insets.left=6; gbc.insets.top=6;for(int r=0; r<5; r++)for(int c=0; c<5; c++) {JButton jb = new JButton("R"+r+"C"+c);gbc.gridx=c; gbc.gridy=r;if(c==2)gbc.gridwidth=2;frame.add(jb, gbc);gbc.gridwidth=1;}}public static  void main(String...arguments) {frame.setVisible(true);}
}

if(c==2)gbc.gridwidth=2; 将第三列的gridwidth设为2, 发现看不到第4列, 也看不到C2第三列双倍宽度, 因为列宽没有基准, 设置列宽基准要用GridLayout的属性

用GridLayout的columnWidths 给列宽设置一个基准

package gridBagLayoutConstraints;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class gridWidthHeight需不需要设置GridBagLayout的网格数2206130658 {static Frame frame = new JFrame(Thread.currentThread().getStackTrace()[1].getClassName());static {frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {frame.dispose();System.exit(0);}});frame.setBounds(100, 100, 1024, 768);GridBagLayout gbl = new GridBagLayout();gbl.columnWidths = new int[] {100 , 100 , 100 , 100 , 100};
//      gbl.columnWidths = new int[] {100 , 110 , 120 , 130 , 140 , 150 };frame.setLayout(gbl); System.out.println(frame.getLayout());GridBagConstraints gbc = new GridBagConstraints();gbc.anchor = GridBagConstraints.WEST;gbc.fill = GridBagConstraints.HORIZONTAL;
//      gbc.insets.left=6; gbc.insets.top=6;for(int r=0; r<5; r++)for(int c=0; c<5; c++) {JButton jb = new JButton("R"+r+"C"+c);gbc.gridx=c; gbc.gridy=r;if(c==2)gbc.gridwidth=2;if(c==3)continue;frame.add(jb, gbc);gbc.gridwidth=1;}}public static  void main(String...arguments) {frame.setVisible(true);}
}

C2第三列有双倍宽度了
单用GridLayout 的 columnWeights 也可以确定基准

package gridBagLayoutConstraints;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class gridWidthHeight需不需要设置GridBagLayout的网格数2206141448 {static Frame frame = new JFrame(Thread.currentThread().getStackTrace()[1].getClassName());static {frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {frame.dispose();System.exit(0);}});frame.setBounds(100, 100, 1024, 768);GridBagLayout gbl = new GridBagLayout();gbl.columnWeights = new double[] {0.1, 0.1 , 0.1  , 0.1 , 0.1};frame.setLayout(gbl); System.out.println(frame.getLayout());GridBagConstraints gbc = new GridBagConstraints();gbc.anchor = GridBagConstraints.WEST;gbc.fill = GridBagConstraints.HORIZONTAL;
//      gbc.insets.left=6; gbc.insets.top=6;for(int r=0; r<5; r++)for(int c=0; c<5; c++) {JButton jb = new JButton("R"+r+"C"+c);gbc.gridx=c; gbc.gridy=r;if(c==2)gbc.gridwidth=2;if(c==3)continue;frame.add(jb, gbc);gbc.gridwidth=1;}}public static  void main(String...arguments) {frame.setVisible(true);}
}

如果多次在一个位置添加(相同的gridx和gridy), 则第一个在最前

package gridBagLayoutConstraints;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class 单独设置GridBagConstraintsGridxGridy始终为0 {static Frame frame = new JFrame(Thread.currentThread().getStackTrace()[1].getClassName());static {frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {frame.dispose();System.exit(0);}});frame.setLayout(new GridBagLayout()); frame.setBounds(100, 100, 1024, 768);GridBagConstraints gbc = new GridBagConstraints();
//      gbc.insets.left=6; gbc.insets.top=6;for(int r=0; r<5; r++)for(int c=0; c<5; c++) {JButton jb = new JButton("R"+r+"C"+c);gbc.gridx=0; gbc.gridy=0;frame.add(jb, gbc);}}public static  void main(String...arguments) {frame.setVisible(true);
//      frame.remove(0);}
}

如果移除第一个元素 frame.remove(0); 则没有了 Jframe要getContentPane().remove(0)

package gridBagLayoutConstraints;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class 单独设置GridBagConstraintsGridxGridy始终为0 {static JFrame frame = new JFrame(Thread.currentThread().getStackTrace()[1].getClassName());static {frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {frame.dispose();System.exit(0);}});frame.setLayout(new GridBagLayout()); frame.setBounds(100, 100, 1024, 768);GridBagConstraints gbc = new GridBagConstraints();
//      gbc.insets.left=6; gbc.insets.top=6;for(int r=0; r<5; r++)for(int c=0; c<5; c++) {JButton jb = new JButton("R"+r+"C"+c);gbc.gridx=0; gbc.gridy=0;frame.add(jb, gbc);}}public static  void main(String...arguments) {frame.setVisible(true);frame.getContentPane().remove(0);}
}

gridx和gridy的默认值是 GridBagConstraints.RELATIVE 也就是 -1

package gridBagLayoutConstraints;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class 单独设置GridBagConstraintsGridxGridy始终为负一 {static JFrame frame = new JFrame(Thread.currentThread().getStackTrace()[1].getClassName());static {frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {frame.dispose();System.exit(0);}});frame.setLayout(new GridBagLayout()); frame.setBounds(100, 100, 1024, 768);GridBagConstraints gbc = new GridBagConstraints();
//      gbc.insets.left=6; gbc.insets.top=6;for(int r=0; r<5; r++)for(int c=0; c<5; c++) {JButton jb = new JButton("R"+r+"C"+c);gbc.gridx=-1; gbc.gridy=GridBagConstraints.RELATIVE;frame.add(jb, gbc);}}public static  void main(String...arguments) {frame.setVisible(true);frame.getContentPane().remove(0);}
}

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