好吧,我有一个问题,我不知道如何知道在网格布局上单击了哪个单元格,有什么功能吗?
我在容器上有 10 行和 10 列的网格布局,我想要的是所有单元格的鼠标侦听器,因此当我单击单元格 (2,1) 时,它会因为鼠标侦听器而显示我正在单击哪个单元格。
有什么线索吗?预先非常感谢
将 MouseListener 添加到使用 GridLayout 并保存网格中组件的容器。然后在 mousePressed 上使用 MouseEvent 对象(例如名为 myMouseEvent)来获取单击点并调用getComponentAt(myMouseEvent.getPoint);
获取单击的组件。没有混乱没有大惊小怪。
例如:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;
public class TestComponentAt extends JPanel {
private static final int ROW_COUNT = 10;
private static final int W = 60;
private static final int H = W;
private static final Dimension PREF_SIZE = new Dimension(W, H);
protected static final Color SELECTION_COLOR = Color.pink;
private JPanel selectedPanel = null;
private Color originalColor = null;
public TestComponentAt() {
setLayout(new GridLayout(ROW_COUNT, ROW_COUNT, 1, 1));
setBackground(Color.black);
for (int i = 0; i < ROW_COUNT * ROW_COUNT; i++) {
JPanel panel = new JPanel();
String name = String.format("[%d, %d]",
i / ROW_COUNT, i % ROW_COUNT);
panel.setName(name);
if (i == 0) {
originalColor = panel.getBackground();
}
panel.setPreferredSize(PREF_SIZE);
add(panel);
}
addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
JPanel panel = (JPanel) getComponentAt(e.getPoint());
if (panel == null || panel == TestComponentAt.this) {
return;
}
if (selectedPanel != null) {
selectedPanel.setBackground(originalColor);
selectedPanel.removeAll();
selectedPanel.revalidate();
selectedPanel.repaint();
}
selectedPanel = panel;
selectedPanel.setBackground(SELECTION_COLOR);
selectedPanel.add(new JLabel(selectedPanel.getName()));
selectedPanel.revalidate();
selectedPanel.repaint();
}
});
}
private static void createAndShowGui() {
JFrame frame = new JFrame("TestComponentAt");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new TestComponentAt());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)