mouseevent.java

介绍有关java的资料 课件 相当一本书籍 里面都是很基础的知识

import java.applet.*;
import java.awt.*;
public class MouseEvent extends Applet
{
	private Dimension m_dimCursorLoc;		// 光标位置
	private boolean m_bDrag;				//鼠标拖动状态
	public MouseEvent()
	{
	}
	public String getAppletInfo()
	{
		return "Name: MouseMove\r\n" +"Author: Myself\r\n";
	}
	public void init()
	{
		resize(640, 480);
	}
	public void destroy()
	{
	}
	public void paint(Graphics g)
	{
		String sCursorLoc = "("	+ m_dimCursorLoc.width
			+ ","+ m_dimCursorLoc.height+ ")";
								// 生成一个包含光标位置的字符串
		g.drawString(sCursorLoc, 10, 20);
		if (m_bDrag)			// 如果处于拖动状态将光标颜色设为红色
		{
			g.setColor(Color.red);
		}
		else
		{
			g.setColor(Color.black);
		}
		int nX = m_dimCursorLoc.width;
		int nY = m_dimCursorLoc.height;
		g.drawLine(nX-2, nY,nX+2,nY);		// 在光标位置画一个十字
		g.drawLine(nX,nY-2,nX,nY+2);
		}
	public void start()
	{
	}
	public void stop()
	{
	}
	public boolean mouseDrag(Event evt, int x, int y)
	{
		m_bDrag = true;				//将拖动模式设为 TRUE
		m_dimCursorLoc = new Dimension(x,y);	//记录光标位置
		repaint();				//强制重画窗口
		return true;				// 返回true，表明事件得到了处理
	}
	public boolean mouseMove(Event evt, int x, int y)
	{
		m_bDrag = false;			//不处于拖动模式
		m_dimCursorLoc = new Dimension(x,y);
		repaint();
		return true;
	}
}