java中Swing的GridBagLayout使用简介 |
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java中Swing的GridBagLayout使用简介
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一、GridBagLayout 布局管理器以及其GridBagConstraints布局参数详解
GridBagLayout主要使用到以下4个参数： columnWidths：设置列数；例如：gridBagLayout.columnWidths = new int[]{0}; 表示只有一列rowHeights：设置行数；例如：gridBagLayout.rowHeights = new int[]{0, 0}; 表示总共有2行columnWeights：设置各列所占宽度比例；gridBagLayout.columnWeights = new double[]{1.0}; 表示，列的宽度为容器的宽度，即撑满容器rowWeights：设置各行所占的高度比例；gridBagLayout.rowWeights = new double[]{0.2,0.8};；表示第一行的高度只占容器高度的2分，第二行的高度占容器的8份 GridBagContraints壳设置的参数如下： 在使用GridBagLayout布局方式之前，需要了解下面的参数：
例如如下代码： public class ClientPanel extends JPanel { /** * Create the panel. */ public ClientPanel() { GridBagLayout gridBagLayout = new GridBagLayout(); gridBagLayout.columnWidths = new int[]{0}; //设置了总共有一列 gridBagLayout.rowHeights = new int[]{0, 0}; //设置了总共有2行 gridBagLayout.columnWeights = new double[]{1.0}; //设置了列的宽度为容器宽度 gridBagLayout.rowWeights = new double[]{0.2,0.8}; //第一行的高度占了容器的2份，第二行的高度占了容器的8份 setLayout(gridBagLayout); JPanel panel = new JPanel(); panel.setBackground(Color.PINK); GridBagConstraints gbc_panel = new GridBagConstraints(); gbc_panel.insets = new Insets(0, 0, 5, 0); gbc_panel.fill = GridBagConstraints.BOTH; gbc_panel.gridx = 0; gbc_panel.gridy = 0; add(panel, gbc_panel); JPanel panel_1 = new JPanel(); panel_1.setBackground(Color.ORANGE); GridBagConstraints gbc_panel_1 = new GridBagConstraints(); gbc_panel_1.fill = GridBagConstraints.BOTH; gbc_panel_1.gridx = 0; gbc_panel_1.gridy = 1; add(panel_1, gbc_panel_1); } }运行结果如下：
以下代码： public class ClientPanel extends JPanel { /** * Create the panel. */ public ClientPanel() { GridBagLayout gridBagLayout = new GridBagLayout(); gridBagLayout.columnWidths = new int[]{0, 0, 0,0}; //设置了4列 gridBagLayout.rowHeights = new int[]{0, 0}; //设置了2行 gridBagLayout.columnWeights = new double[]{0.25,0.25,0.25,0.25}; gridBagLayout.rowWeights = new double[]{0.2,0.8}; setLayout(gridBagLayout); JPanel panel = new JPanel(); panel.setBackground(Color.PINK); GridBagConstraints gbc_panel = new GridBagConstraints(); gbc_panel.insets = new Insets(0, 0, 5, 0); gbc_panel.fill = GridBagConstraints.BOTH; gbc_panel.gridx = 3; gbc_panel.gridy = 0; add(panel, gbc_panel); JPanel panel_1 = new JPanel(); panel_1.setBackground(Color.ORANGE); GridBagConstraints gbc_panel_1 = new GridBagConstraints(); gbc_panel_1.insets = new Insets(0, 0, 0, 5); gbc_panel_1.fill = GridBagConstraints.BOTH; gbc_panel_1.gridx = 0; gbc_panel_1.gridy = 1; add(panel_1, gbc_panel_1); } }运行结果为：
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