是否也可以将JLabels和JTextField添加到仅中心边框布局的下半部分。出于审美原因,我不想在上半部分放任何东西,也没有找到任何实现此目的的方法。我仍然使用Swing和AWT还是比较新的...任何建议将不胜感激。我添加了一张我想要达到的目标的图片。
最佳答案
给BorderLayout.CENTER
JPanel一个new GridLayout(2, 1)
(用于2行1列)。将一个空白JLabel添加到同一JPanel中,用于上半部分空白。将另一个组件JPanel添加到BorderLayout.CENTER
JPanel,并使它的底部空间使用GridBagLayout,然后使用GridBagConstraints添加标签和字段。这里的秘密是嵌套JPanels,每个都使用所选的布局管理器。
例如:
import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import javax.swing.*;
public class Layouts {
private static final int TF_COLS = 8;
private static void createAndShowGui() {
JPanel borderLayoutPanel = new JPanel(new BorderLayout());
borderLayoutPanel.setBorder(BorderFactory
.createTitledBorder("BorderLayout Panel"));
borderLayoutPanel.add(createInnerPanel("North"), BorderLayout.PAGE_START);
borderLayoutPanel.add(createInnerPanel("North"), BorderLayout.PAGE_START);
borderLayoutPanel.add(createInnerPanel("South"), BorderLayout.PAGE_END);
borderLayoutPanel.add(createInnerPanel("East"), BorderLayout.LINE_END);
borderLayoutPanel.add(createInnerPanel("West"), BorderLayout.LINE_START);
JPanel centerPanel = new JPanel(new GridLayout(2, 1));
centerPanel.add(new JLabel());
JPanel gblPanel = new JPanel(new GridBagLayout());
gblPanel.add(new JLabel("Question 1:"), createGbc(0, 0));
gblPanel.add(new JTextField(TF_COLS), createGbc(1, 0));
gblPanel.add(new JLabel("Question 2:"), createGbc(0, 2));
gblPanel.add(new JTextField(TF_COLS), createGbc(1, 2));
centerPanel.add(gblPanel);
borderLayoutPanel.add(centerPanel);
JFrame frame = new JFrame("Layouts");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(borderLayoutPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
private static GridBagConstraints createGbc(int x, int y) {
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = x;
gbc.gridy = y;
gbc.gridwidth = 1;
gbc.gridheight = 1;
gbc.anchor = (x == 0) ? GridBagConstraints.WEST : GridBagConstraints.EAST;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
int iGap = 5;
gbc.insets = (x == 0) ? new Insets(iGap, iGap, iGap, 3 * iGap) : new Insets(
iGap, iGap, iGap, iGap);
return gbc;
}
private static JComponent createInnerPanel(String text) {
JPanel panel = new JPanel();
panel.add(new JLabel(text));
panel.setBorder(BorderFactory.createEtchedBorder());
return panel;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
是的,这不仅仅是简单地设置边界,而是更多的初始工作,但是最终节省时间和挫败感的地方是以后必须维护此GUI的时候,因为如果使用正确的布局,调试,增强或更改您的布局将更加容易GUI。在所有平台和屏幕分辨率上看起来也很不错。