[DllImport("user32.dll")]
static extern bool DrawAnimatedRects(IntPtr hwnd, int idAni,
[In] ref RECT lprcFrom, [In] ref RECT lprcTo);
Only the IDANI_CAPTION constant will result in any animation. Any other constants have not been implemented on any Windows platform!
Since only IDANI_CAPTION is implemented, to get the effect of IDANI_OPEN, simply swap the lprcFrom and lprcTo rectangles, but still specify the IDANI_CAPTION constant.
[System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.StructLayoutLayoutKind.Sequential)]
struct RECT
{
public RECT(System.Drawing.Rectangle rectangle)
{
Left = rectangle.Left;
Top = rectangle.Top;
Right = rectangle.Right;
Bottom = rectangle.Bottom;
}
public RECT(System.Drawing.Point location, System.Drawing.Size size)
{
Left = location.X;
Top = location.Y;
Right = location.X + size.Width;
Bottom = location.Y + size.Height;
}
public System.Int32 Left;
public System.Int32 Top;
public System.Int32 Right;
public System.Int32 Bottom;
}
[System.Runtime.InteropServices.DllImport("user32.dll")]
static extern bool DrawAnimatedRects(System.IntPtr hwnd, int idAni,
[In] ref RECT lprcFrom, [In] ref RECT lprcTo);
[System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindowEx(System.IntPtr hwndParent, IntPtr hwndChildAfter,
string lpszClass, string lpszWindow);
[System.Runtime.InteropServices.DllImport("user32.dll")]
static extern bool GetWindowRect(System.IntPtr hWnd, out RECT lpRect);
/// <summary>
/// Show or hide a form with animation.
/// </summary>
/// <param name="form">The form reference to be animated.</param>
/// <param name="show">If true the form will be animated as if opening, otherwise as if closing.</param>
static public void ShowHideAnimated(System.Windows.Forms form, System.Boolean show)
{
RECT from = new RECT(form.Location, form.Size);
RECT to;
System.IntPtr hWnd =
FindWindowEx(FindWindow("Shell_TrayWnd", null), System.IntPtr.Zero, "TrayNotifyWnd", null);
if (hWnd != System.IntPtr.Zero)
{
GetWindowRect(hWnd, out to);
}
else
{
to.Left = System.Windows.Forms.SystemInformation.VirtualScreen.Right - form.Width;
to.Top = System.Windows.Forms.SystemInformation.VirtualScreen.Bottom -
System.Windows.Forms.SystemInformation.CaptionHeight -
(System.Windows.Forms.SystemInformation.FrameBorderSize.Height * 2);
to.Right = System.Windows.Forms.SystemInformation.VirtualScreen.Right;
to.Bottom = System.Windows.Forms.SystemInformation.VirtualScreen.Bottom;
}
if (show)
{
DrawAnimatedRects(form.Handle, IDANI_CAPTION, ref to, ref from);
form.Show();
}
else
{
form.Hide();
DrawAnimatedRects(form.Handle, IDANI_CAPTION, ref from, ref to);
}
}
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