我正在尝试让BasicArrowButton组件调整大小,并且无法让它在我的生活中工作。以下代码是一个更简单的问题版本,但仍然展示了我正在尝试做的事情。该按钮位于JPanel中,面板的布局设置为FlowLayout。它需要调整大小,同时仍然保留在具有相同布局的面板中。在此先感谢,并抱歉格式错误:
主要课程:
package PackageMain;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.WindowConstants;
public class Main {
public static JFrame frame = new JFrame("Window");
public static PanelOne p1;
public static PanelTwo p2;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setBounds(100, 100, 800, 600);
p1 = new PanelOne();
frame.setVisible(true);
} catch(Exception e){
}
}
});
}
}
第二课:
package PackageMain;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JPanel;
import javax.swing.plaf.basic.BasicArrowButton;
public class PanelOne{
public PanelOne(){
FlowLayout fl = new FlowLayout();
BasicArrowButton b1 = new BasicArrowButton(BasicArrowButton.WEST);
JPanel p1 = new JPanel();
p1.add(b1);
p1.setLayout(fl);
b1.setPreferredSize(new Dimension(100, 100)); //DOESN'T WORK!
Main.frame.add(p1);
}
}
答案 0 :(得分:3)
问题是BasicArrowButton类重写了方法getPreferredSize()。因此,您需要使用不支持此方法的布局,或者为此方法提供自己的实现。
第一个提案:
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import javax.swing.plaf.basic.BasicArrowButton;
public class BasicArrowButtonTest {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frm = new JFrame("Test arrow button");
JPanel p = new JPanel(new GridLayout(1, 1));
p.setPreferredSize(new Dimension(100, 100));
p.add(new BasicArrowButton(BasicArrowButton.WEST));
frm.add(p);
frm.pack();
frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frm.setLocationRelativeTo(null);
frm.setVisible(true);
}
});
}
}
第二个提案:
package org.swingsamples.label;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import javax.swing.plaf.basic.BasicArrowButton;
public class BasicArrowButtonTest {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frm = new JFrame("Test arrow button");
JPanel p = new JPanel(new FlowLayout());
BasicArrowButton btn = new BasicArrowButton(BasicArrowButton.WEST) {
@Override
public Dimension getPreferredSize() {
return new Dimension(100, 100);
}
};
p.add(btn);
frm.add(p);
frm.pack();
frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frm.setLocationRelativeTo(null);
frm.setVisible(true);
}
});
}
}