用鼠標移動控件

Question

我要使用“鼠標移動按鈕”，一切正常，但是當我在按鈕窗口上移動鼠標時，按鈕的左側和頂部（左上角）將位於光標pos處。

我不希望這種情況發生。 我的代碼中的錯誤在哪里？

private void button1_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == System.Windows.Forms.MouseButtons.Left)
    {
        clicked = true;
    }

}

private void button1_MouseMove(object sender, MouseEventArgs e)
{
    if (clicked)
    {
        Point p = new Point();//in form coordinates
        p.X =  e.X + button1.Left;
        p.Y =  e.Y + button1.Top;
        button1.Left = p.X;
        button1.Top = p.Y ;

    }

}

private void button1_MouseUp(object sender, MouseEventArgs e)
{
    clicked = false;   
}

Answer 1

這就是你所需要的

    private Point MouseDownLocation;

    private void MyControl_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == System.Windows.Forms.MouseButtons.Left)
        {
            MouseDownLocation = e.Location;
        }
    }

    private void MyControl_MouseMove(object sender, MouseEventArgs e)
    {
        if (e.Button == System.Windows.Forms.MouseButtons.Left)
        {
            this.Left = e.X + this.Left - MouseDownLocation.X;
            this.Top = e.Y + this.Top - MouseDownLocation.Y;
        }
    }

Answer 2

我發現了...

這是完整的代碼：

private void button1_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == System.Windows.Forms.MouseButtons.Left)
    {
        Point p = ConvertFromChildToForm(e.X, e.Y, button1);
        iOldX = p.X;
        iOldY = p.Y;
        iClickX = e.X;
        iClickY = e.Y;
        clicked = true;
    }

}

private void button1_MouseMove(object sender, MouseEventArgs e)
{
    if (clicked)
    {
        Point p = new Point();//in form coordinates
        p.X =  e.X + button1.Left;
        p.Y =  e.Y + button1.Top;
        button1.Left = p.X - iClickX;
        button1.Top = p.Y - iClickY;

    }

}

private void button1_MouseUp(object sender, MouseEventArgs e)
{
    clicked = false;   
}

Answer 3

我不知道我是否正確，但以防萬一...如果問題是將光標定位在按鈕（或其他組件）的中央，則可以通過考慮寬度和高度來實現：

 private void button1_MouseMove(object sender, MouseEventArgs e) {
      if (clicked) {
        Point p = new Point(); //in form coordinates
        p.X = e.X + button1.Left - (button1.Width/2);
        p.Y = e.Y + button1.Top - (button1.Height/2);
        button1.Left = p.X;
        button1.Top = p.Y;
      }
    }

Answer 4

我認為這是您需要的完整代碼：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MoveButton
{
public partial class Form1 : Form
{
    bool clicked = false;
    Point iOld = new Point();
    Point iClick = new Point();
    public Form1()
    {
        InitializeComponent();
    }
    private Point ConvertFromChildToForm(int x, int y, Control control)
    {
        Point p = new Point(x, y);
        control.Location = p;
        return p;
    }
    private void button1_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == System.Windows.Forms.MouseButtons.Left)
        {
            Point p = ConvertFromChildToForm(e.X, e.Y, button1);
            iOld.X = p.X;
            iOld.Y = p.Y;
            iClick.X = e.X;
            iClick.Y = e.Y;
            clicked = true;
        }

    }

    private void button1_MouseMove(object sender, MouseEventArgs e)
    {
        if (clicked)
        {
            Point p = new Point();//in form coordinates
            p.X = e.X + button1.Left;
            p.Y = e.Y + button1.Top;
            button1.Left = p.X - iClick.X;
            button1.Top = p.Y - iClick.Y;

        }

    }

    private void button1_MouseUp(object sender, MouseEventArgs e)
    {
        clicked = false;
    }
   }
}