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。
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