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 程式師世界 >> 編程語言 >> C語言 >> 關於C語言 >> c#中拖動圖片的例子

c#中拖動圖片的例子

編輯:關於C語言

這個問題來自論壇提問,並沒有什麼難度,也不需要重畫內容。當然還有一種方法是通過api發送WM_SysCommand 和SC_MOVE,也就是拖動無標題窗體的方法 ,但是效果沒有這個好。

using System;
using System.Drawing;
using System.Windows.Forms;
namespace WindowsApplication2
...{
  public partial class Form1 : Form
  ...{
    static string strDown = @"AAACAAEAICAAAAsACQAwAQAAFgAAACgAAAAgAAAAQAAAAAEAAQAAAAAAAAIAAAAA
            AAAAAAAAAAAAAAAAAAAAAAAA////AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
            AAAAAAAAAAf4AAAD8AAAA/AAAAPwAAAH+AAAD/gAAB/8AAA//AAAN/wAACf+AAAH
            9gAADbQAAA2wAAAJSAAAAIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
            AAAAAAAA////////////////////////////////////////////8AP///gH///4
            B///+Af///AD///gA///wAH//4AB//+AAf//gAD//4AA///AAP//4AH//+AH///g
            D////j////////////////////////////////////////////8=";
    static string strUp = @"AAACAAEAICAAAAoACAAwAQAAFgAAACgAAAAgAAAAQAAAAAEAAQAAAAAAAAIAAA
            AAAAAAAAAAAAAAAAAAAAAAAAAA////AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
            AAAAAAAAAAAAAf4AAAD8AAAA/AAAAPwAAAH+AAAD/gAAB/8AAA//AAAd/wAAGf+
            AAAH9gAADbYAAA2yAAAZsAAAGbAAAAGAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
            AAAAAAAAAAAAA////////////////////////////////////////////8AP///
            gH///4B///+Af///AD///gA///wAH//4AB//8AAf//AAD//4AA///gAP//4AD//
            8AF///AB///5A////5///////////////////////////////////////8=";

    Cursor curUp = new Cursor(new System.IO.MemoryStream(Convert.FromBase64String(strUp)));
    Cursor curDown = new Cursor(new System.IO.MemoryStream(Convert.FromBase64String(strDown)));
    public Form1()
    ...{
      InitializeComponent();
      this.pictureBox1.Cursor = curUp;
    }

    bool bDragging = false;
    Point pClicked;

    private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
    ...{

      bDragging = true;
      pClicked = new Point(e.X, e.Y);
      this.pictureBox1.Cursor = curDown;
    }

    private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
    ...{
      if (bDragging)
      ...{
        Point oMoveToPoint;
        oMoveToPoint = this.PointToClIEnt(pictureBox1.PointToScreen(new Point(e.X, e.Y)));
        oMoveToPoint.Offset(pClicked.X * -1, pClicked.Y * -1);
        pictureBox1.Location = oMoveToPoint;
      }
    }
    private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
    ...{
      bDragging = false;
      this.pictureBox1.Cursor = curUp;
    }
  }
}

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