如何使用GridBagLayout对齐JPanel中的组件中心？
当我尝试对齐我的组件时，它会左转或右转。
所以我只想要解决方案摆脱这个问题，并告诉我如何将面板的大小设置为400 x 350像素。
这是我的代码.... titleLabel和ResultLabel应该在中心对齐
public TimeGui() {
layout = new GridBagLayout();
setSize(400, 350); //**Its not working**
setBackground(Color.LIGHT_GRAY);
setBorder(BorderFactory.createLineBorder(Color.BLACK));
setBorder(new TitledBorder(new EtchedBorder(), "Time Conversion") );
setLayout(layout);
layoutConstraints = new GridBagConstraints();
textField1 = new JTextField(10);
textField2 = new JTextField(10);
String[] names1 = {"Seconds", "Minutes", "Hours", "Days", "Weeks"};
comboBox1 = new JComboBox<>(names1);
comboBox2 = new JComboBox<>(names1);
titleLabel = new JLabel("Time Conversion Unit", JLabel.CENTER);
resultLabel = new JLabel("Result Label");
equalLabel = new JLabel("=");
convertButton = new JButton("Convert");
layoutConstraints.fill = GridBagConstraints.HORIZONTAL;
Insets inset = new Insets(10, 10, 10, 10);
layoutConstraints.anchor = GridBagConstraints.CENTER;
addComponent(titleLabel, 0, 0, 2, 2, inset ); // I tried (0,1,2,2)
addComponent(comboBox1, 3, 0, 2, 3, inset);
addComponent(comboBox2, 3, 2, 2, 3, inset);
addComponent(textField1, 6, 0, 1, 2, inset);
addComponent(equalLabel, 6, 1, 1, 2, inset);
addComponent(textField2, 6, 2, 1, 2, inset);
addComponent(resultLabel, 8, 1, 2, 1, inset);
addComponent(convertButton, 10, 0, 2, 2, inset);
}
private void addComponent(Component component, int row,
int column, int width, int height, Insets inset1) {
layoutConstraints.gridx = column;
layoutConstraints.gridy = row;
layoutConstraints.gridwidth = width;
layoutConstraints.gridheight = height;
layoutConstraints.insets = inset1;
layout.setConstraints(component, layoutConstraints);
add(component);
}
}
问题在于你的gridwidth和fill属性...
基本上所有我改变的是......
addComponent(titleLabel, 0, 0, GridBagConstraints.REMAINDER, 2, inset); // I tried (0,1,2,2)
addComponent(comboBox1, 3, 0, 1, 3, inset);
addComponent(comboBox2, 3, 2, 1, 3, inset);
addComponent(textField1, 6, 0, 1, 2, inset);
addComponent(equalLabel, 6, 1, 1, 2, inset);
addComponent(textField2, 6, 2, 1, 2, inset);
layoutConstraints.fill = GridBagConstraints.NONE;
addComponent(resultLabel, 8, 0, GridBagConstraints.REMAINDER, 1, inset);
addComponent(convertButton, 10, 0, GridBagConstraints.REMAINDER, 2, inset);
你可以和其他人一起玩。
至于定义面板的实际大小，你可以做的最好的是重写TimeGui的getPreferredSize方法...
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 350);
}
这将“向”父容器“建议”你想要布置的尺寸。 请记住，这是一个可选值，布局管理员有权忽略它。
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