如何在一个button的MouseMove事件中触发另一个button的MouseUp事件？

Question

现在想按下一个button1之后可以拖出一条线来，拖到另一个button2上面释放，这条线就连接这两个button，在其他地方释放则不绘制这条线。

但是现在拖到button2上面释放时触发的是button1的MouseUp事件，如何触发button2的MouseUp事件？

代码如下：

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public bool isDrawing = false;
        public Point startPoint;
        public Point endPoint;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_MouseDown(object sender, MouseEventArgs e)
        {
            isDrawing = true;
            startPoint = new Point(button1.Location.X, button1.Location.Y);
            endPoint = startPoint;
        }

        private void button1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isDrawing)
            {
                Graphics g = this.CreateGraphics();  

                if (endPoint != startPoint)
                {
                    Pen erase = new Pen(Color.White, 2);
                    g.DrawLine(erase, startPoint, endPoint);
                }

                int iMouseX = e.X;
                int iMouseY = e.Y;
                Pen pen = new Pen(Color.Black, 2);
                endPoint = new Point(startPoint.X + iMouseX, startPoint.Y + iMouseY);
                g.DrawLine(pen, startPoint, endPoint);
            }
        }

        private void button1_MouseUp(object sender, MouseEventArgs e)
        {
            Graphics g = this.CreateGraphics();
            Pen erase = new Pen(Color.White, 2);
            g.DrawLine(erase, startPoint, endPoint);
        }

        private void button2_MouseUp(object sender, MouseEventArgs e)
        {
            if (isDrawing)
            {
                isDrawing = false;
                endPoint = startPoint;
            }
        }


    }
}

 

Answer 1

private void button1_MouseUp(object sender, MouseEventArgs e)
        {
            Graphics g = this.CreateGraphics();
            Pen erase = new Pen(Color.White, 2);
            g.DrawLine(erase, startPoint, endPoint);

            //call button2's mouseUp
            button2_MouseUp(sender, e);
        }

---

亂馬客blog: http://www.dotblogs.com.tw/rainmaker/

Answer 2

感谢您的回复。 可能是我表述不够全面，描述问题时简化处理了一下。实际情况是有很多button2这样的按钮，您这个只能用于只有一个的情况。

Answer 3

或許您可以改用Drag & Drop的方式
1.將Form & Button2的AllowDrop屬性設成true
2.在button1_mousedown多加入 button1.DoDragDrop((sender as Button).Text, DragDropEffects.All);
3.把button1_mouseMove code移到Form1_DragOver事件之中
4.把button1_mouseUp及button2_mouseUp的Code移到button2_DragDrop事件之中

這樣您就可以在不同的button上執行mouseUp要做的事情了哦!

完整的Code如下，希望對您有幫助!

 

private void button1_MouseDown(object sender, MouseEventArgs e)
{
	isDrawing = true;
	startPoint = new Point(button1.Location.X, button1.Location.Y);
	endPoint = startPoint;
	button1.DoDragDrop((sender as Button).Text, DragDropEffects.All);
}


private void button2_DragEnter(object sender, DragEventArgs e)
{
	e.Effect = DragDropEffects.All;
}

private void button2_DragDrop(object sender, DragEventArgs e)
{
	Graphics g = this.CreateGraphics();
	Pen erase = new Pen(Color.White, 2);
	g.DrawLine(erase, startPoint, endPoint);
	if (isDrawing)
	{
		isDrawing = false;
		endPoint = startPoint;
	}
}



private void Form1_DragOver(object sender, DragEventArgs e)
{
	if (isDrawing)
	{
		Graphics g = this.CreateGraphics();

		if (endPoint != startPoint)
		{
			Pen erase = new Pen(Color.White, 2);
			g.DrawLine(erase, startPoint, endPoint);
		}
		endPoint = ((Control)sender).PointToClient (new Point(e.X, e.Y));
		int iMouseX = endPoint.X;
		int iMouseY = endPoint.Y;
		
		Pen pen = new Pen(Color.Black, 2);
		endPoint = new Point(startPoint.X + iMouseX, startPoint.Y + iMouseY);
		g.DrawLine(pen, startPoint, endPoint);
	}
}

 

---

亂馬客blog: http://www.dotblogs.com.tw/rainmaker/

Answer 4

Hi laodouya,

欢迎来到MSDN论坛!

请您看下下面的代码:

        public bool isDrawing = false;
        public Point startPoint;
        public Point endPoint;      

        private void button1_MouseDown(object sender, MouseEventArgs e)
        {
            isDrawing = true;
            startPoint = new Point(button1.Location.X, button1.Location.Y);
            endPoint = startPoint;
        }

        private void button1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isDrawing)
            {
                Graphics g = this.CreateGraphics();

                if (endPoint != startPoint)
                {
                    Pen erase = new Pen(System.Drawing.SystemColors.Control, 2);
                    g.DrawLine(erase, startPoint, endPoint);
                }

                int iMouseX = e.X;
                int iMouseY = e.Y;
                Pen pen = new Pen(Color.Black, 2);
                endPoint = new Point(startPoint.X + iMouseX, startPoint.Y + iMouseY);
                g.DrawLine(pen, startPoint, endPoint);
            }
        }

        private void button1_MouseUp(object sender, MouseEventArgs e)
        {
            Graphics g = this.CreateGraphics();
            Pen erase = new Pen(System.Drawing.SystemColors.Control, 2);
            g.DrawLine(erase, startPoint, endPoint);

            foreach (Control c in this.Controls)
            {
                if (c is Button && c!=button1)
                { 
                    if (c.Bounds.Contains(startPoint.X+e.X,startPoint.X+e.Y))
                    {
                        endPoint = new Point(startPoint.X+e.X,startPoint.X+e.Y);
                        Pen pen = new Pen(Color.Black, 2);                        
                        g.DrawLine(pen, startPoint, endPoint);
                    }
                }
            }

            isDrawing = false;        
        }                         

 

这里根据button1 MouseUp时候的位置,判断鼠标释放的点是否在某Button控件边界范围内,来确定终点位置.

希望对您有所帮助!

谢谢!

yoyo

---

Yoyo Jiang[MSFT]
MSDN Community Support | Feedback to us