C#中WinForm控件的拖动和缩放的实现代码
C#WinForm控件的拖动和缩放是个很有用的功能。实现起来其实很简单的，主要是设计控件的MouseDown、MouseLeave、MouseMove事件,下面的几个步骤将逐步实现C#WinForm控件的拖动和缩放的功能。
1、定义一个枚举类型，描述光标状态
privateenumEnumMousePointPosition
{
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
constintBand=5; constintMinWidth=10; constintMinHeight=10; privateEnumMousePointPositionm_MousePointPosition; privatePointp,p1;
3、定义自己的MyMouseDown事件
privatevoidMyMouseDown(objectsender,System.Windows.Forms.MouseEventArgse)
{
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
privatevoidMyMouseLeave(objectsender,System.EventArgse)
{
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
privateEnumMousePointPositionMousePointPosition(Sizesize,System.Windows.Forms.MouseEventArgse)
{
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){returnEnumMousePointPosition.MouseSizeTopLeft;}
else
{
if(e.Y>-1*Band+size.Height)
{returnEnumMousePointPosition.MouseSizeBottomLeft;}
else
{returnEnumMousePointPosition.MouseSizeLeft;}
}
}
else
{
if(e.X>-1*Band+size.Width)
{
if(e.Y<Band)
{returnEnumMousePointPosition.MouseSizeTopRight;}
else
{
if(e.Y>-1*Band+size.Height)
{returnEnumMousePointPosition.MouseSizeBottomRight;}
else
{returnEnumMousePointPosition.MouseSizeRight;}
}
}
else
{
if(e.Y<Band)
{returnEnumMousePointPosition.MouseSizeTop;}
else
{
if(e.Y>-1*Band+size.Height)
{returnEnumMousePointPosition.MouseSizeBottom;}
else
{returnEnumMousePointPosition.MouseDrag;}
}
}
}
}
else
{returnEnumMousePointPosition.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
privatevoidMyMouseMove(objectsender,System.Windows.Forms.MouseEventArgse)
{
ControllCtrl=(senderasControl);
if(e.Button==MouseButtons.Left)
{
switch(m_MousePointPosition)
{
caseEnumMousePointPosition.MouseDrag:
lCtrl.Left=lCtrl.Left+e.X-p.X;
lCtrl.Top=lCtrl.Top+e.Y-p.Y;
break;
caseEnumMousePointPosition.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;
caseEnumMousePointPosition.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;
caseEnumMousePointPosition.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;
caseEnumMousePointPosition.MouseSizeTop:
lCtrl.Top=lCtrl.Top+(e.Y-p.Y);
lCtrl.Height=lCtrl.Height-(e.Y-p.Y);
break;
caseEnumMousePointPosition.MouseSizeLeft:
lCtrl.Left=lCtrl.Left+e.X-p.X;
lCtrl.Width=lCtrl.Width-(e.X-p.X);
break;
caseEnumMousePointPosition.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;
caseEnumMousePointPosition.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;
caseEnumMousePointPosition.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
{
caseEnumMousePointPosition.MouseSizeNone:
this.Cursor=Cursors.Arrow;//'箭头
break;
caseEnumMousePointPosition.MouseDrag:
this.Cursor=Cursors.SizeAll;//'四方向
break;
caseEnumMousePointPosition.MouseSizeBottom:
this.Cursor=Cursors.SizeNS;//'南北
break;
caseEnumMousePointPosition.MouseSizeTop:
this.Cursor=Cursors.SizeNS;//'南北
break;
caseEnumMousePointPosition.MouseSizeLeft:
this.Cursor=Cursors.SizeWE;//'东西
break;
caseEnumMousePointPosition.MouseSizeRight:
this.Cursor=Cursors.SizeWE;//'东西
break;
caseEnumMousePointPosition.MouseSizeBottomLeft:
this.Cursor=Cursors.SizeNESW;//'东北到南西
break;
caseEnumMousePointPosition.MouseSizeBottomRight:
this.Cursor=Cursors.SizeNWSE;//'东南到西北
break;
caseEnumMousePointPosition.MouseSizeTopLeft:
this.Cursor=Cursors.SizeNWSE;//'东南到西北
break;
caseEnumMousePointPosition.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。
privatevoidinitProperty()
{
for(inti=0;i<this.panel1.Controls.Count;i++)
{
this.panel1.Controls[i].MouseDown+=newSystem.Windows.Forms.MouseEventHandler(MyMouseDown);
this.panel1.Controls[i].MouseLeave+=newSystem.EventHandler(MyMouseLeave);
this.panel1.Controls[i].MouseMove+=newSystem.Windows.Forms.MouseEventHandler(MyMouseMove);
}
}
8、ok，在运行之前你在panel1上放几个控件，执行程序，应该可以随便移动、改变其大小了
C#WinForm控件的拖动和缩放的实现就此完成。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。