Java 为什么GridBagLayout没有按计划显示?
我一直在努力达到工作中要求的最终结果 为了便于参考,这里是: 这是当前的结果: 按钮编号和行以Java 为什么GridBagLayout没有按计划显示?,java,swing,layout-manager,gridbaglayout,Java,Swing,Layout Manager,Gridbaglayout,我一直在努力达到工作中要求的最终结果 为了便于参考,这里是: 这是当前的结果: 按钮编号和行以1,1的形式显示,后跟为此单元格声明的列数(2) 如您所见,它以按钮1,1(3)开始,下面的1,2(4)具有相同的宽度,同时声明不同的列数 有人能确定如何更正代码吗 当前代码: import java.awt.*; import javax.swing.*; import javax.swing.border.EmptyBorder; public class KeyBoardLayout {
1,1
的形式显示,后跟为此单元格声明的列数(2)
如您所见,它以按钮1,1(3)
开始,下面的1,2(4)
具有相同的宽度,同时声明不同的列数
有人能确定如何更正代码吗
当前代码:
import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class KeyBoardLayout {
private JComponent ui = null;
KeyBoardLayout() {
initUI();
}
public void initUI() {
if (ui!=null) return;
ui = new JPanel(new GridBagLayout());
ui.setBorder(new EmptyBorder(4,4,4,4));
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = 3;
gbc.fill = GridBagConstraints.HORIZONTAL;
ui.add(new JButton("1,1 (3)"), gbc);
gbc.gridx = 3;
gbc.gridwidth = 2;
ui.add(new JButton("2,1 (2)"), gbc);
gbc.gridx = 5;
ui.add(new JButton("3,1 (2)"), gbc);
gbc.gridx = 7;
ui.add(new JButton("4,1 (2)"), gbc);
gbc.gridx = 9;
ui.add(new JButton("5,1 (2)"), gbc);
gbc.gridx = 11;
ui.add(new JButton("6,1 (2)"), gbc);
gbc.gridx = 13;
ui.add(new JButton("7,1 (2)"), gbc);
gbc.gridx = 15;
gbc.gridwidth = 3;
ui.add(new JButton("8,1 (3)"), gbc);
gbc.gridx = 18;
gbc.gridwidth = 4;
ui.add(new JButton("9,1 (4)"), gbc);
gbc.gridx = 0;
gbc.gridy = 1;
ui.add(new JButton("1,2 (4)"), gbc);
gbc.gridx = 4;
gbc.gridwidth = 2;
ui.add(new JButton("2,2 (2)"), gbc);
gbc.gridx = 6;
ui.add(new JButton("3,2 (2)"), gbc);
gbc.gridx = 8;
ui.add(new JButton("4,2 (2)"), gbc);
gbc.gridx = 10;
ui.add(new JButton("5,2 (2)"), gbc);
gbc.gridx = 12;
ui.add(new JButton("6,2 (2)"), gbc);
gbc.gridx = 14;
ui.add(new JButton("7,2 (2)"), gbc);
gbc.gridx = 16;
ui.add(new JButton("8,2 (2)"), gbc);
gbc.gridx = 18;
gbc.gridwidth = 4;
ui.add(new JButton("9,2 (4)"), gbc);
gbc.gridx = 0;
gbc.gridy = 2;
gbc.gridwidth = 5;
ui.add(new JButton("1,3 (5)"), gbc);
gbc.gridx = 5;
gbc.gridwidth = 2;
ui.add(new JButton("2,3 (2)"), gbc);
gbc.gridx = 7;
ui.add(new JButton("3,3 (2)"), gbc);
gbc.gridx = 9;
ui.add(new JButton("4,3 (2)"), gbc);
gbc.gridx = 11;
ui.add(new JButton("5,3 (2)"), gbc);
gbc.gridx = 13;
ui.add(new JButton("6,3 (2)"), gbc);
gbc.gridx = 15;
ui.add(new JButton("7,3 (2)"), gbc);
gbc.gridx = 17;
ui.add(new JButton("8,3 (2)"), gbc);
gbc.gridx = 19;
gbc.gridwidth = 3;
ui.add(new JButton("9,3 (3)"), gbc);
gbc.gridx = 0;
gbc.gridy = 3;
gbc.gridwidth = 3;
ui.add(new JButton("1,4 (3)"), gbc);
gbc.gridx = 3;
ui.add(new JButton("2,4 (3)"), gbc);
gbc.gridx = 6;
gbc.gridwidth = 10;
ui.add(new JButton("3,4 (10)"), gbc);
gbc.gridx = 16;
gbc.gridwidth = 3;
ui.add(new JButton("4,4 (3)"), gbc);
gbc.gridx = 19;
ui.add(new JButton("5,4 (3)"), gbc);
}
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) {
}
KeyBoardLayout o = new KeyBoardLayout();
JFrame f = new JFrame("Keyboard Layout");
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);
}
}
我恐怕想要的布局没有简单的GridBagLayout限制那么简单。GBL不考虑gridwidth的比例。这意味着它无法检测组件宽度的2/3。 所以如果你定义
c1 (gridwidth=2) c2 (gridwidth=1)
c3 (gridwidth=3)
期待得到
|****|**|
|*******|
结果将是
|**|**|
|*****|
camickr的示例之所以有效,是因为定义了简单的单元格高度,这是唯一的方法。从图片中,每行包含5到9个按钮,这意味着
GridBagLayout
只知道9个单独列的宽度
将(..)中的数字相加,表示每行的总gridwidth
。总数是22
GridBagLayout
不知道如何将9列转换为22列。它不知道在列中没有组件的列要使用什么宽度。因此布局不知道如何处理gridwidth
约束
解决方案是告诉GridBagLayout
网格中的预期列数和网格中每列的最小宽度
这可以通过设置GridBagLayout
本身的值来实现:
//ui = new JPanel(new GridBagLayout());
int[] columns = new int[22];
Arrays.fill(columns, 30);
GridBagLayout gbl = new GridBagLayout();
gbl.columnWidths = columns;
ui = new JPanel(gbl);
数组的大小定义列数
分配给数组中每个条目的值是列的“最小宽度”(每个列的宽度可能不同)
现在,GridBagLayout
知道如何计算每个列的宽度,并且使用GridBagWidth
作为每个组件的约束条件将按预期工作
更新代码如下:
import java.awt.*;
import java.util.Arrays;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class KeyBoardLayout {
private JComponent ui = null;
KeyBoardLayout() {
initUI();
}
public void initUI() {
if (ui!=null) return;
//ui = new JPanel(new GridBagLayout());
int[] columns = new int[22];
Arrays.fill(columns, 30);
GridBagLayout gbl = new GridBagLayout();
gbl.columnWidths = columns;
ui = new JPanel(gbl);
ui.setBorder(new EmptyBorder(4,4,4,4));
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = 3;
gbc.fill = GridBagConstraints.HORIZONTAL;
ui.add(new JButton("1,1 (3)"), gbc);
gbc.gridx = 3;
gbc.gridwidth = 2;
ui.add(new JButton("2,1 (2)"), gbc);
gbc.gridx = 5;
ui.add(new JButton("3,1 (2)"), gbc);
gbc.gridx = 7;
ui.add(new JButton("4,1 (2)"), gbc);
gbc.gridx = 9;
ui.add(new JButton("5,1 (2)"), gbc);
gbc.gridx = 11;
ui.add(new JButton("6,1 (2)"), gbc);
gbc.gridx = 13;
ui.add(new JButton("7,1 (2)"), gbc);
gbc.gridx = 15;
gbc.gridwidth = 3;
ui.add(new JButton("8,1 (3)"), gbc);
gbc.gridx = 18;
gbc.gridwidth = 4;
ui.add(new JButton("9,1 (4)"), gbc);
gbc.gridx = 0;
gbc.gridy = 1;
ui.add(new JButton("1,2 (4)"), gbc);
gbc.gridx = 4;
gbc.gridwidth = 2;
ui.add(new JButton("2,2 (2)"), gbc);
gbc.gridx = 6;
ui.add(new JButton("3,2 (2)"), gbc);
gbc.gridx = 8;
ui.add(new JButton("4,2 (2)"), gbc);
gbc.gridx = 10;
ui.add(new JButton("5,2 (2)"), gbc);
gbc.gridx = 12;
ui.add(new JButton("6,2 (2)"), gbc);
gbc.gridx = 14;
ui.add(new JButton("7,2 (2)"), gbc);
gbc.gridx = 16;
ui.add(new JButton("8,2 (2)"), gbc);
gbc.gridx = 18;
gbc.gridwidth = 4;
ui.add(new JButton("9,2 (4)"), gbc);
gbc.gridx = 0;
gbc.gridy = 2;
gbc.gridwidth = 5;
ui.add(new JButton("1,3 (5)"), gbc);
gbc.gridx = 5;
gbc.gridwidth = 2;
ui.add(new JButton("2,3 (2)"), gbc);
gbc.gridx = 7;
ui.add(new JButton("3,3 (2)"), gbc);
gbc.gridx = 9;
ui.add(new JButton("4,3 (2)"), gbc);
gbc.gridx = 11;
ui.add(new JButton("5,3 (2)"), gbc);
gbc.gridx = 13;
ui.add(new JButton("6,3 (2)"), gbc);
gbc.gridx = 15;
ui.add(new JButton("7,3 (2)"), gbc);
gbc.gridx = 17;
ui.add(new JButton("8,3 (2)"), gbc);
gbc.gridx = 19;
gbc.gridwidth = 3;
ui.add(new JButton("9,3 (3)"), gbc);
gbc.gridx = 0;
gbc.gridy = 3;
gbc.gridwidth = 3;
ui.add(new JButton("1,4 (3)"), gbc);
gbc.gridx = 3;
ui.add(new JButton("2,4 (3)"), gbc);
gbc.gridx = 6;
gbc.gridwidth = 10;
ui.add(new JButton("3,4 (10)"), gbc);
gbc.gridx = 16;
gbc.gridwidth = 3;
ui.add(new JButton("4,4 (3)"), gbc);
gbc.gridx = 19;
ui.add(new JButton("5,4 (3)"), gbc);
}
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) {
}
KeyBoardLayout o = new KeyBoardLayout();
JFrame f = new JFrame("Keyboard Layout");
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);
}
}
这种方法也可以用于行
这意味着
GridBagLayout
提供了创建网格的功能,并且只在网格的几个单元格中填充组件。你知道,我花了,我花了很长时间试图让这样的东西发挥作用,最终放弃了,写了我自己的布局管理器:P@MadProgrammer我曾经尝试过编写一个自定义布局管理器..一次。一个滚动布局
。我由布局大师之一运行它,他评论说WTE“需要一些改进”。因为他是一个非常非常好的人,不喜欢得罪人——我认为这意味着我的努力更接近“可悲,结果很脆弱”。)是的,它是专门为这项任务而构建的,从我的“猜测”来看,GridBagLayout
不喜欢在列内容超出该列范围的情况下填充半个列-它可能与fill
属性有关,因为它不使用GridBagLayout
,但这是一个想法