C# WinForm控制元件移動調整大小
阿新 • • 發佈：2021-08-12
class ControlComponent
{
#region 實現窗體內的控制元件拖動
//用法：在Form初始化或者Form_Load時先執行
//DragComponent a = new DragComponent();
//a.initProperty(groupBox1);
//將介面groupBox1上的所有控制元件都繫結MyMouseDown、MyMouseLeave、MyMouseMove事件。
private Control control;
const int Band = 5;
const int MinWidth = 10;
const int MinHeight = 10;
private EnumMousePointPosition m_MousePointPosition;
private Point p, p1;
public enum EnumMousePointPosition
{
MouseSizeNone = 0, //'無
MouseSizeRight = 1, //'拉伸右邊框
MouseSizeLeft = 2, //'拉伸左邊框
MouseSizeBottom = 3, //'拉伸下邊框
MouseSizeTop = 4, //'拉伸上邊框
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 // '滑鼠拖動
}
public 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;
}
public void MyMouseLeave(object sender, System.EventArgs e)
{
m_MousePointPosition = EnumMousePointPosition.MouseSizeNone;
control.Cursor = Cursors.Arrow;
}
public 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;
}
}
public 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; //'記錄游標拖動的當前點
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; //'記錄游標拖動的當前點
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; //'記錄游標拖動的當前點
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; //'記錄游標拖動的當前點
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; //'記錄游標拖動的當前點
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); //'判斷游標的位置狀態
switch (m_MousePointPosition) //'改變游標
{
case EnumMousePointPosition.MouseSizeNone:
control.Cursor = Cursors.Arrow; //'箭頭
break;
case EnumMousePointPosition.MouseDrag:
control.Cursor = Cursors.SizeAll; //'四方向
break;
case EnumMousePointPosition.MouseSizeBottom:
control.Cursor = Cursors.SizeNS; //'南北
break;
case EnumMousePointPosition.MouseSizeTop:
control.Cursor = Cursors.SizeNS; //'南北
break;
case EnumMousePointPosition.MouseSizeLeft:
control.Cursor = Cursors.SizeWE; //'東西
break;
case EnumMousePointPosition.MouseSizeRight:
control.Cursor = Cursors.SizeWE; //'東西
break;
case EnumMousePointPosition.MouseSizeBottomLeft:
control.Cursor = Cursors.SizeNESW; //'東北到南西
break;
case EnumMousePointPosition.MouseSizeBottomRight:
control.Cursor = Cursors.SizeNWSE; //'東南到西北
break;
case EnumMousePointPosition.MouseSizeTopLeft:
control.Cursor = Cursors.SizeNWSE; //'東南到西北
break;
case EnumMousePointPosition.MouseSizeTopRight:
control.Cursor = Cursors.SizeNESW; //'東北到南西
break;
default:
break;
}
}
}
public void initProperty(Control ctl)
{
control = ctl;
control.MouseDown += new System.Windows.Forms.MouseEventHandler(MyMouseDown);
control.MouseLeave += new System.EventHandler(MyMouseLeave);
control.MouseMove += new System.Windows.Forms.MouseEventHandler(MyMouseMove);
}
#endregion
}
使用方法：
ControlComponent cc= new ControlComponent();
cc.initProperty(你需要改變的控制元件);