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JavaAwtSwing布局 GridBagLayout和GridBagConstraints测试-220610
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; }- 1
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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; }- 1
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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); } }- 1
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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); } }- 1
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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); } }- 1
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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); } }- 1
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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); } }- 1
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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); } }- 1
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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); } }- 1
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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); } }- 1
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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); } }- 1
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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); } }- 1
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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); } }- 1
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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); } }- 1
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- 原文地址：https://blog.csdn.net/kfepiza/article/details/125215269
