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{相关信息}
鼠标事件类(MouseEvent)指组件中发生的鼠标动作事件,例如按下鼠标、释放鼠标、单击鼠标、鼠标光标进入或离开组件的几何
图形、移动鼠标、拖动鼠标。当鼠标移动到某个区域或鼠标单击某个组件时就会触发鼠标事件。使用鼠标事件必须给组件添加一个MouseListener
接口的事件处理器,该接口包含以下 5 个方法:
void mouseClicked(MouseEvent e):当鼠标在该区域单击时发生
void mouseEntered(MouseEvent e):当鼠标进入该区域时发生
void mouseExited(MouseEvent e):当鼠标离开该区域时发生
void mousePressed(MouseEvent e):当鼠标在该区域按下时发生
void mouseReleased(MouseEvent e):当鼠标在该区域放开时发生
{实现效果图}
实验过程中,在panel区,明显可以看出单击可按下的区别。按一下马上松开是一个点击,获取一次位置信息。
如果按下不松开,移动后一会儿,再松开,不会获取位置信息。
{相关代码}
package sup.orange.learn; import java.awt.*; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; /** * Created by re-x on 11/2/14. */ public class MouseEventDemo extends Frame { Panel panel; TextField textfield1, textfield2; public MouseEventDemo () { super(); init(); } public static void main(String[] args) { new MouseEventDemo(); } public void init() { setLayout(new GridLayout(3, 1)); textfield1 = new TextField(30); textfield2 = new TextField(); add(textfield1); add(textfield2); panel = new Panel(); panel.setBackground(Color.CYAN); add(panel); panel.addMouseListener(new MouseListener() { @Override public void mouseClicked(MouseEvent e) { textfield2.setText("x="+e.getX()+";y="+e.getY()); } @Override public void mousePressed(MouseEvent e) { textfield1.setText("mouse pressed"); } @Override public void mouseReleased(MouseEvent e) { textfield1.setText("mouse released"); } @Override public void mouseEntered(MouseEvent e) { textfield1.setText("mouse entered"); } @Override public void mouseExited(MouseEvent e) { textfield1.setText("mouse exited"); } }); addWindowListener(new WindowAdapter() { @Override public void windowClosing(WindowEvent e) { super.windowClosing(e); dispose(); System.exit(0); } }); setSize(200, 300); setVisible(true); } }
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原文地址:http://www.cnblogs.com/aqing1987/p/4223363.html