Question

所以，我有一个带有背景图像（图片框）的表格和一些随机位置上的动态名称为pic [i]的图片框。

我在for循环中创建了这段代码。

    pic[i].MouseDown += new MouseEventHandler(picMouseDown);
    pic[i].MouseMove += new MouseEventHandler(picMouseMove);
    pic[i].MouseUp += new MouseEventHandler(picMouseUp);

下面我展示了相应的事件。

    int x = 0;
    int y = 0;
    bool drag = false;

    private void picMouseDown(object sender, MouseEventArgs e)
    {
        // Get original position of cursor on mousedown
        x = e.X;
        y = e.Y;
        drag = true;
    }

    private void picMouseMove(object sender, MouseEventArgs e)
    {
        if (drag)
        {
            // Get new position of picture
            pic[i].Top += e.Y - y;    //this i here is wrong
            pic[i].Left += e.X - x;
            pic[i].BringToFront();
        }
    }

    private void picMouseUp(object sender, MouseEventArgs e)
    {
        drag = false;
    }

所以，我知道在＆＃34; picMouseMove＆＃34;，＆＃34; i＆＃34;具有for循环结束时的值。

我想要做的是在＆＃34; picMouseMove＆＃34;上获取pic [i] id。事件，以便用户可以成功地拖动拼图。

Answer 1

您需要强制 sender到PictureBox。然后你可以像访问它一样访问它。

只需更改

private void picMouseMove(object sender, MouseEventArgs e)
{
    if (drag)
    {
        // Get new position of picture
        pic[i].Top += e.Y - y;    //this i here is wrong
        pic[i].Left += e.X - x;
        pic[i].BringToFront();
    }
}

到

private void picMouseMove(object sender, MouseEventArgs e)
{
    if (drag)
    {
        PictureBox pb = (PictureBox ) sender;
        // Get new position of picture
        pb.Top += e.Y - y;    
        pb.Left += e.X - x;
        pb.BringToFront();
    }
}

如何拖动动态创建的图片框？

1 个答案: