怎么用鼠标拖动图片？？？

[coolchangecool]

大家一定都用过 ACDSee 和 Acrobat PDF Reader 吧？
当图像大于你当前的显示窗口时，你可以用小手状的鼠标，抓住图片，拖动着看！
请问，怎样才能在程序中实现此功能？

[coolchangecool]

不会吧？难道真的没人知道怎么做吗？

[coolchangecool]

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[julong88]

private void panel2_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
if(e.Button == MouseButtons.Left)
{
mouseDown = true;
p.X = e.X;
p.Y = e.Y;
}
}

private void panel2_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
mouseDown = false;
}

private void panel2_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
if(mouseDown)
{
if((panel2.Left+panel2.Width)>panel2.Parent.Width)
return;
panel2.Left = panel2.Location.X + e.X - p.X;
panel2.Top = panel2.Location.Y + e.Y - p.Y;
}
}


拖动panel

[julong88]

public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;

[DllImportAttribute ("user32.dll")]
public static extern int SendMessage(IntPtr hWnd,
int Msg, int wParam, int lParam);

[DllImportAttribute ("user32.dll")]
public static extern bool ReleaseCapture();private void panel1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
ReleaseCapture();
SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
}
}

[julong88]

上面的代码可以拖动窗体