C# WinForm实现控件拖动实例介绍

主要是设计控件的MouseDown、MouseLeave、MouseMove事件。一步步来吧：
1、定义一个枚举类型，描述光标状态

private enum EnumMousePointPosition

{

MouseSizeNone = 0, //'无

MouseSizeRight = 1, //'拉伸右边框

MouseSizeLeft = 2, //'拉伸左边框

MouseSizeBottom = 3, //'拉伸下边框

MouseSizeTop = 4, //'拉伸上边框

MouseSizeTopLeft = 5, //'拉伸左上角

MouseSizeTopRight = 6, //'拉伸右上角

MouseSizeBottomLeft = 7, //'拉伸左下角

MouseSizeBottomRight= 8, //'拉伸右下角

MouseDrag = 9 // '鼠标拖动

}

2、定义几个变量

const int Band = 5;

const int MinWidth=10;

const int MinHeight=10;

private EnumMousePointPosition m_MousePointPosition;

private Point p,p1;

3、定义自己的MyMouseDown事件

private void MyMouseDown(object sender,System.Windows.Forms.MouseEventArgs e)

{

p.X=e.X;

p.Y=e.Y;

p1.X=e.X;

p1.Y=e.Y;

}

4、定义自己的MyMouseLeave事件

private void MyMouseLeave(object sender, System.EventArgs e)

{

m_MousePointPosition = EnumMousePointPosition.MouseSizeNone;

this.Cursor=Cursors.Arrow;

}

5、设计一个函数，确定光标在控件不同位置的样式

private EnumMousePointPosition MousePointPosition(Size size,System.Windows.Forms.MouseEventArgs e)

{

if ((e.X >= -1 * Band) | (e.X <= size.Width) | (e.Y >= -1 * Band) | (e.Y <= size.Height))

{

if (e.X < Band)

{

if (e.Y < Band) {return EnumMousePointPosition.MouseSizeTopLeft;}

else

{

if (e.Y > -1 * Band + size.Height)

{return EnumMousePointPosition.MouseSizeBottomLeft;}

else

{return EnumMousePointPosition.MouseSizeLeft;}

}

}

else

{

if (e.X > -1 * Band + size.Width)

{

if (e.Y < Band)

{return EnumMousePointPosition.MouseSizeTopRight;}

else

{

if (e.Y > -1 * Band + size.Height)

{return EnumMousePointPosition.MouseSizeBottomRight;}

else

{return EnumMousePointPosition.MouseSizeRight;}

}

}

else

{

if (e.Y < Band)

{return EnumMousePointPosition.MouseSizeTop;}

else

{

if (e.Y > -1 * Band + size.Height)

{return EnumMousePointPosition.MouseSizeBottom;}

else

{return EnumMousePointPosition.MouseDrag;}

}

}

}

}

else

{return EnumMousePointPosition.MouseSizeNone;}

}

6、定义自己的MyMouseMove事件，在这个事件里，会使用上面设计的函数

private void MyMouseMove(object sender,System.Windows.Forms.MouseEventArgs e)

{

Control lCtrl =(sender as Control);

if (e.Button==MouseButtons.Left)

{

switch (m_MousePointPosition)

{

case EnumMousePointPosition.MouseDrag:

lCtrl.Left =lCtrl.Left+ e.X - p.X;

lCtrl.Top =lCtrl.Top+ e.Y - p.Y;

break;

case EnumMousePointPosition.MouseSizeBottom:

lCtrl.Height = lCtrl.Height + e.Y - p1.Y;

p1.X=e.X;

p1.Y=e.Y; //'记录光标拖动的当前点

break;

case EnumMousePointPosition.MouseSizeBottomRight:

lCtrl.Width = lCtrl.Width + e.X - p1.X;

lCtrl.Height = lCtrl.Height + e.Y - p1.Y;

p1.X=e.X;

p1.Y=e.Y; //'记录光标拖动的当前点

break;

case EnumMousePointPosition.MouseSizeRight:

lCtrl.Width = lCtrl.Width + e.X - p1.X;

// lCtrl.Height = lCtrl.Height + e.Y - p1.Y;

p1.X=e.X;

p1.Y=e.Y; //'记录光标拖动的当前点

break;

case EnumMousePointPosition.MouseSizeTop:

lCtrl.Top = lCtrl.Top + (e.Y - p.Y);

lCtrl.Height = lCtrl.Height - (e.Y - p.Y);

break;

case EnumMousePointPosition.MouseSizeLeft:

lCtrl.Left = lCtrl.Left + e.X - p.X;

lCtrl.Width = lCtrl.Width - (e.X - p.X);

break;

case EnumMousePointPosition.MouseSizeBottomLeft:

lCtrl.Left = lCtrl.Left + e.X - p.X;

lCtrl.Width = lCtrl.Width - (e.X - p.X);

lCtrl.Height = lCtrl.Height+ e.Y - p1.Y;

p1.X=e.X;

p1.Y=e.Y; //'记录光标拖动的当前点

break;

case EnumMousePointPosition.MouseSizeTopRight:

lCtrl.Top = lCtrl.Top + (e.Y - p.Y);

lCtrl.Width = lCtrl.Width + (e.X - p1.X);

lCtrl.Height = lCtrl.Height - (e.Y - p.Y);

p1.X=e.X;

p1.Y=e.Y; //'记录光标拖动的当前点

break;

case EnumMousePointPosition.MouseSizeTopLeft:

lCtrl.Left = lCtrl.Left + e.X - p.X;

lCtrl.Top = lCtrl.Top + (e.Y - p.Y);

lCtrl.Width = lCtrl.Width - (e.X - p.X);

lCtrl.Height = lCtrl.Height - (e.Y - p.Y);

break;

default:

break;

}

if (lCtrl.Width<MinWidth) lCtrl.Width=MinWidth;

if (lCtrl.Height<MinHeight) lCtrl.Height=MinHeight;

}

else

{

m_MousePointPosition = MousePointPosition(lCtrl.Size, e); //'判断光标的位置状态

switch (m_MousePointPosition) //'改变光标

{

case EnumMousePointPosition.MouseSizeNone:

this.Cursor = Cursors.Arrow; //'箭头

break;

case EnumMousePointPosition.MouseDrag:

this.Cursor = Cursors.SizeAll; //'四方向

break;

case EnumMousePointPosition.MouseSizeBottom:

this.Cursor = Cursors.SizeNS; //'南北

break;

case EnumMousePointPosition.MouseSizeTop:

this.Cursor = Cursors.SizeNS; //'南北

break;

case EnumMousePointPosition.MouseSizeLeft:

this.Cursor = Cursors.SizeWE; //'东西

break;

case EnumMousePointPosition.MouseSizeRight:

this.Cursor = Cursors.SizeWE; //'东西

break;

case EnumMousePointPosition.MouseSizeBottomLeft:

this.Cursor = Cursors.SizeNESW; //'东北到南西

break;

case EnumMousePointPosition.MouseSizeBottomRight:

this.Cursor = Cursors.SizeNWSE; //'东南到西北

break;

case EnumMousePointPosition.MouseSizeTopLeft:

this.Cursor = Cursors.SizeNWSE; //'东南到西北

break;

case EnumMousePointPosition.MouseSizeTopRight:

this.Cursor = Cursors.SizeNESW; //'东北到南西

break;

default:

break;

}

}

}

7、制作一个初始化过程，将界面panel1上的所有控件都绑定MyMouseDown、MyMouseLeave、MyMouseMove事件，记得在Form初始化或者Form_Load时先执行它。

private void initProperty()

{

for(int i = 0; i < this.panel1.Controls.Count; i++)

{

this.panel1.Controls[i].MouseDown+= new System.Windows.Forms.MouseEventHandler(MyMouseDown);

this.panel1.Controls[i].MouseLeave+= new System.EventHandler(MyMouseLeave);

this.panel1.Controls[i].MouseMove += new System.Windows.Forms.MouseEventHandler(MyMouseMove);

}

}

以上就是C# WinForm实现控件拖动几个步骤，希望对你有所帮助。