C# WinForm窗体上控件自由拖动 C# WinForm实现窗体上控件自由拖动功能示例
a771948524 人气:0想了解C# WinForm实现窗体上控件自由拖动功能示例的相关内容吗,a771948524在本文为您仔细讲解C# WinForm窗体上控件自由拖动的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:C#,WinForm,窗体,控件,拖动,下面大家一起来学习吧。
本文实例讲述了C# WinForm实现窗体上控件自由拖动功能。分享给大家供大家参考,具体如下:
说明:首先在窗体上放一个PictrueBox控件,命名为pb1,拖动完整代码如下:
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace WinFormDrag { public partial class Form1 : Form { //鼠标按下坐标(control控件的相对坐标) Point mouseDownPoint = Point.Empty; //显示拖动效果的矩形 Rectangle rect = Rectangle.Empty; //是否正在拖拽 bool isDrag = false; public Form1() { InitializeComponent(); } private void Form1_Paint(object sender, PaintEventArgs e) { if (rect != Rectangle.Empty) { if (isDrag) {//画一个和Control一样大小的黑框 e.Graphics.DrawRectangle(Pens.Black, rect); } else { e.Graphics.DrawRectangle(new Pen(this.BackColor), rect); } } } /// <summary> /// 按下鼠标时 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void pb1_MouseDown(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { mouseDownPoint = e.Location; //记录控件的大小 rect = pb1.Bounds; } } /// <summary> /// 移过时 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void pb1_MouseMove(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { isDrag = true; //重新设置rect的位置,跟随鼠标移动 rect.Location = getPointToForm(new Point(e.Location.X - mouseDownPoint.X, e.Location.Y - mouseDownPoint.Y)); this.Refresh(); } } /// <summary> /// 释放鼠标按钮时 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void pb1_MouseUp(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { if (isDrag) { isDrag = false; //移动control到放开鼠标的地方 pb1.Location = rect.Location; this.Refresh(); } reset(); } } //重置变量 private void reset() { mouseDownPoint = Point.Empty; rect = Rectangle.Empty; isDrag = false; } //把相对与control控件的坐标,转换成相对于窗体的坐标。 private Point getPointToForm(Point p) { return this.PointToClient(pb1.PointToScreen(p)); } } }
希望本文所述对大家C#程序设计有所帮助。
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