Winform 实现控件点击拖拽移动位置
winForm开发中有时会遇到需要设计自定义布局的情况,我们可以让用户自定义控件位置,最后保存这些位置作为预览方案。
使用方法
new ControlMoveResize(button1,this);
辅助类代码如下:
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace TestTool
{
///
/// 使窗口的中的指定控件支持运行时移动
/// TODO:运行时缩放
///
public class ControlMoveResize
{
#region 私有成员
bool isMoving = false;
Point pCtrlLastCoordinate = new Point(0, 0);
Point pCursorOffset = new Point(0, 0);
Point pCursorLastCoordinate = new Point(0, 0);
private Control ctrl = null;
private ScrollableControl containe = null;
#endregion
#region 私有方法
///
/// 在鼠标左键按下的状态记录鼠标当前的位置,以及被移动组件的当前位置
///
///
///
private void MouseDown(object sender, MouseEventArgs e)
{
if (containe == null)
{
return;
}
if (e.Button == MouseButtons.Left)
{
isMoving = true;
pCtrlLastCoordinate.X = ctrl.Left;
pCtrlLastCoordinate.Y = ctrl.Top;
pCursorLastCoordinate.X = Cursor.Position.X;
pCursorLastCoordinate.Y = Cursor.Position.Y;
}
}
private void MouseMove(object sender, MouseEventArgs e)
{
if (containe == null)
{
return;
}
if (e.Button == MouseButtons.Left)
{
if (this.isMoving)
{
ctrl.BringToFront();
Point pCursor = new Point(Cursor.Position.X, Cursor.Position.Y);
pCursorOffset.X = pCursor.X - pCursorLastCoordinate.X;
pCursorOffset.Y = pCursor.Y - pCursorLastCoordinate.Y;
ctrl.Left = pCtrlLastCoordinate.X + pCursorOffset.X;
ctrl.Top = pCtrlLastCoordinate.Y + pCursorOffset.Y;
ctrl.Parent.Refresh();
}
}
}
private void MouseUp(object sender, MouseEventArgs e)
{
if (containe == null)
{
return;
}
if (this.isMoving)
{
if (pCursorOffset.X == 0 && pCursorOffset.Y == 0)
{
return;
}
if ((pCtrlLastCoordinate.X + pCursorOffset.X + ctrl.Width) > 0)
{
ctrl.Left = pCtrlLastCoordinate.X + pCursorOffset.X;
}
else
{
ctrl.Left = 0;
}
if ((pCtrlLastCoordinate.Y + pCursorOffset.Y + ctrl.Height) > 0)
{
ctrl.Top = pCtrlLastCoordinate.Y + pCursorOffset.Y;
}
else
{
ctrl.Top = 0;
}
pCursorOffset.X = 0;
pCursorOffset.Y = 0;
}
moveDownAction?.Invoke();
}
#endregion
public Action moveDownAction;
#region 构造函数
///
/// 获取被移动控件对象和容器对象
///
/// 被设置为可运行时移动的控件
/// 可移动控件的容器
public ControlMoveResize(Control c, ScrollableControl parentContain)
{
ctrl = c;
this.containe = parentContain;
ctrl.MouseDown += new MouseEventHandler(MouseDown);
ctrl.MouseMove += new MouseEventHandler(MouseMove);
ctrl.MouseUp += new MouseEventHandler(MouseUp);
}
#endregion
}
}
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