/// <summary>
/// Raises the <see cref="E:System.Windows.Forms.ToolStripItem.VisibleChanged"/> event.
/// </summary>
/// <param name="e">An <see cref="T:System.EventArgs"/> that contains the event data.</param>
protected override void OnVisibleChanged(EventArgs e)
{
base.OnVisibleChanged(e);
if (UnsafeNativeMethods.IsRunningOnMono)
{
return; // in case of non-Windows
}
if ((Visible && ShowingAnimation == PopupAnimations.None) || (!Visible && HidingAnimation == PopupAnimations.None))
{
return;
}
var flags = Visible ? Consts.AW_ROLL : Consts.AW_HIDE;
PopupAnimations _flags = Visible ? ShowingAnimation : HidingAnimation;
if (_flags == PopupAnimations.SystemDefault)
{
if (SystemInformation.IsMenuAnimationEnabled)
{
if (SystemInformation.IsMenuFadeEnabled)
{
_flags = PopupAnimations.Blend;
}
else
{
_flags = PopupAnimations.Slide | (Visible ? PopupAnimations.TopToBottom : PopupAnimations.BottomToTop);
}
}
else
{
_flags = PopupAnimations.None;
}
}
if ((_flags & (PopupAnimations.Blend | PopupAnimations.Center | PopupAnimations.Roll | PopupAnimations.Slide)) == PopupAnimations.None)
{
return;
}
if (_resizableTop) // popup is “inverted”, so the animation must be
{
if ((_flags & PopupAnimations.BottomToTop) != PopupAnimations.None)
{
_flags = (_flags & ~PopupAnimations.BottomToTop) | PopupAnimations.TopToBottom;
}
else if ((_flags & PopupAnimations.TopToBottom) != PopupAnimations.None)
{
_flags = (_flags & ~PopupAnimations.TopToBottom) | PopupAnimations.BottomToTop;
}
}
if (_resizableLeft) // popup is “inverted”, so the animation must be
{
if ((_flags & PopupAnimations.RightToLeft) != PopupAnimations.None)
{
_flags = (_flags & ~PopupAnimations.RightToLeft) | PopupAnimations.LeftToRight;
}
else if ((_flags & PopupAnimations.LeftToRight) != PopupAnimations.None)
{
_flags = (_flags & ~PopupAnimations.LeftToRight) | PopupAnimations.RightToLeft;
}
}
flags = flags | (Consts.AW_MASK & (int)_flags);
UnsafeNativeMethods.SetTopMost(this);
UnsafeNativeMethods.AnimateWindow(this, AnimationDuration, flags);
}