C#鼠标拖动问题
各位，C#中如何按住鼠标左键拖动一个按钮随其在winform中运动，释放鼠标左键后它就停留在当前窗体不在运动
下面是我的程序
private void button1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
Point p = new Point(e.X, e.Y);
button1.Location = p;
button1.Text = e.X.ToString() + e.Y.ToString();
}
}
请各位指教，小弟初学者，打扰各位了
[解决办法]
随便写了一个，仅供参考，只考虑了向右向下，不过建议你还是发消息吧，网上有例子
bool down = false; private void button10_MouseMove(object sender, MouseEventArgs e) { if (!down) return; Point p = button10.PointToScreen(button10.Location); Point p1 = button10.PointToScreen(e.Location); button10.Left = button10.Left + (p1.X - p.X); button10.Top = button10.Top + (p1.Y - p.Y); this.Update(); } private void button10_MouseDown(object sender, MouseEventArgs e) { down = true; } private void button10_MouseUp(object sender, MouseEventArgs e) { down = false; }
[解决办法]
// C#鼠标拖动任意控件Point p = new Point(0, 0); //利用Windows的API函数：SendMessage 和 ReleaseCapture const uint WM_SYSCOMMAND = 0x0112; const uint SC_MOVE = 0xF010; const uint HTCAPTION = 0x0002; [DllImport("user32.dll", EntryPoint = "SendMessageA")] private static extern int SendMessage(IntPtr hwnd, uint wMsg, uint wParam, uint lParam); [DllImport("user32.dll")] private static extern int ReleaseCapture();public void MouseDown(object sender, MouseEventArgs e) { Button bt = sender as Button; ReleaseCapture(); SendMessage((sender as Control).Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);}public void bt_MouseMove(object sender, MouseEventArgs e) { Button bt = sender as Button; if (e.Button == MouseButtons.Left) { bt.Location = new Point(bt.Left + e.X - p.X, bt.Top + e.Y - p.Y); } }
[解决办法]
创建一个panel，两个button（button的移动类似）
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;using System.Runtime.InteropServices;namespace 实现panel的拖动和缩放{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } Point p = new Point(0, 0);//定义一个点 //并为控件 添加 MouseDown 事件 // C#鼠标拖动任意控件 //利用Windows的API函数：SendMessage 和 ReleaseCapture const uint WM_SYSCOMMAND = 0x0112; const uint SC_MOVE = 0xF010; const uint HTCAPTION = 0x0002; [DllImport("user32.dll", EntryPoint = "SendMessageA")] private static extern int SendMessage(IntPtr hwnd, uint wMsg, uint wParam, uint lParam); [DllImport("user32.dll")] private static extern int ReleaseCapture(); int xx = 0; private void addpanel_Click(object sender, EventArgs e) {//创建panel xx++; CreateControls.CreatePanel(backpanel, xx.ToString(), panel_MouseMove, panel_MouseDown, panel_Paint); } public void panel_Paint(object sender, PaintEventArgs e) { Panel panel = sender as Panel; ControlPaint.DrawBorder(e.Graphics, panel.ClientRectangle, Color.Red, 1, ButtonBorderStyle.Solid, Color.Red, 1, ButtonBorderStyle.Solid, Color.Red, 1, ButtonBorderStyle.Solid, Color.Red, 1, ButtonBorderStyle.Solid); } public void panel_MouseMove(object sender, MouseEventArgs e) {//实现panel的缩放和拖动 Panel panel = sender as Panel;//取得当前panel if (e.Button == System.Windows.Forms.MouseButtons.Left) {//如果点击的为鼠标左键 if (ModifierKeys == Keys.Control) {//如果按住ctrl键，则为缩放panel panel.Width += e.X - p.X;//取出panel缩放后的实际宽度 panel.Height += e.Y - p.Y;//取出panel缩放后的实际高度 p = new Point(e.X, e.Y);//给点重新赋值 panel.Refresh();//刷新放置绘制出现延迟 } else {//否则为拖动panel panel.Location = new Point(panel.Left + e.X - p.X, panel.Top + e.Y - p.Y);//拖动panel后重新定位位置 } } } public void panel_MouseDown(object sender, MouseEventArgs e) { Panel panel = sender as Panel; panelname = panel.Name; if ((int)Control.ModifierKeys == (int)Keys.Control) {//如果按住ctrl键，则更新p点 p = new Point(e.X, e.Y); } else {//否则执行移动，使用api函数 ReleaseCapture(); SendMessage((sender as Control).Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0); } } public string panelname; private void delpanel_Click(object sender, EventArgs e) { if (panelname == "" || panelname == null) { MessageBox.Show("请选择一个panel"); } else { Panel panel = backpanel.Controls[panelname] as Panel; backpanel.Controls.Remove(panel); panelname = ""; } } }}