要在WinForm中使用拖放功能來操作控件,可以按照以下步驟進(jìn)行操作:
在設(shè)計(jì)窗體時,將要操作的控件設(shè)置為可拖放(AllowDrop = true)。
為需要拖放的控件添加MouseDown、MouseMove和DragDrop事件處理程序。
在MouseDown事件處理程序中,記錄鼠標(biāo)按下時的控件位置。
private Point mouseDownPoint;
private void Control_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
mouseDownPoint = new Point(e.X, e.Y);
}
}
private void Control_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
Control control = sender as Control;
if (control != null)
{
if (Math.Abs(e.X - mouseDownPoint.X) > 5 || Math.Abs(e.Y - mouseDownPoint.Y) > 5)
{
control.DoDragDrop(control, DragDropEffects.Move);
}
}
}
}
private void Control_DragDrop(object sender, DragEventArgs e)
{
Control control = e.Data.GetData(typeof(Control)) as Control;
if (control != null)
{
Point dropPoint = this.PointToClient(new Point(e.X, e.Y));
control.Location = new Point(dropPoint.X - mouseDownPoint.X, dropPoint.Y - mouseDownPoint.Y);
}
}
通過以上步驟,就可以實(shí)現(xiàn)在WinForm中使用拖放功能來操作控件了。