C# Signature:
[DllImport("user32.dll")]
static extern bool DrawAnimatedRects(IntPtr hwnd, int idAni,
[In] ref RECT lprcFrom, [In] ref RECT lprcTo);
User-Defined Types:
Notes:
Only the IDANI_CAPTION constant will result in any animation. Any other constants have not been implemented on any Windows platform!
Tips & Tricks:
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.
Sample Code:
[StructLayout(LayoutKind.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 Int32 Left;
public Int32 Top;
public Int32 Right;
public Int32 Bottom;
}
[DllImport("user32.dll")]
static extern bool DrawAnimatedRects(IntPtr hwnd, int idAni, [In] ref RECT lprcFrom, [In] ref RECT lprcTo);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
[DllImport("user32.dll")]
static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
static public void ShowHideAnimated(System.Windows.Forms form, System.Boolean show)
{
RECT from = new RECT(form.Location, form.Size);
RECT to;
IntPtr hWnd = FindWindowEx(FindWindow("Shell_TrayWnd", null), IntPtr.Zero, "TrayNotifyWnd", null);
if (hWnd != IntPtr.Zero) {
GetWindowRect(hWndC, out to);
}
else {
to.Left = SystemInformation.VirtualScreen.Right - this.Width;
to.Top = SystemInformation.VirtualScreen.Bottom - SystemInformation.CaptionHeight - (SystemInformation.FrameBorderSize.Height * 2);
to.Right = SystemInformation.VirtualScreen.Right;
to.Bottom = SystemInformation.VirtualScreen.Bottom;
}
if (show) {
DrawAnimatedRects(this.Handle, IDANI_CAPTION, ref to, ref from);
form.Show();
}
else {
form.Hide();
DrawAnimatedRects(this.Handle, IDANI_CAPTION, ref from, ref to);
}
}
Alternative Managed API:
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