Winform 实现控件点击拖拽移动位置_winform拖动控件_11eleven的博客-CSDN博客

安宇雨 - 随手采集
2023-04-14 17:35:54
随手采集
0000-未整理-等待研究

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
{
/// <summary>
/// 使窗口的中的指定控件支持运行时移动
/// TODO:运行时缩放
/// </summary>
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
/// <summary>
/// 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
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
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
/// <summary>
/// 获取被移动控件对象和容器对象
/// </summary>
/// <param name="c">被设置为可运行时移动的控件</param>
/// <param name="parentContain">可移动控件的容器</param>
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
}
}