private BeforePopupEventArgs OnBeforePopup()
{
BeforePopupEventArgs e = new BeforePopupEventArgs();
if (this.BeforePopup != null)
{
this.BeforePopup(this, e);
}
return(e);
}
public void OnPopup()
{
if (this.HostControl == null)
{
return;
}
BeforePopupEventArgs e = this.OnBeforePopup();
if (e.Cancel)
{
return;
}
this.HostControl.Show(this);
}
public void Show(Control control, Rectangle rect, bool center)
{
BeforePopupEventArgs e = this.OnBeforePopup();
if (e.Cancel)
{
return;
}
if (control == null)
{
throw new ArgumentNullException("control");
}
SetOwnerItem(control);
if (_canResize && !_changeRegion)
{
Padding = new Padding(3);
}
else if (!_changeRegion)
{
Padding = new Padding(1);
}
else
{
Padding = Padding.Empty;
}
int width = Padding.Horizontal;
int height = Padding.Vertical;
base.Size = new Size(
_popupControl.Width + width,
_popupControl.Height + height);
_resizableTop = false;
_resizableLeft = false;
Point location = control.PointToScreen(
new Point(rect.Left, rect.Bottom));
Rectangle screen = Screen.FromControl(control).WorkingArea;
if (center)
{
if (location.X + (rect.Width + Size.Width) / 2 > screen.Right)
{
location.X = screen.Right - Size.Width;
_resizableLeft = true;
}
else
{
location.X = location.X - (Size.Width - rect.Width) / 2;
}
}
else
{
if (location.X + Size.Width > (screen.Left + screen.Width))
{
_resizableLeft = true;
location.X = (screen.Left + screen.Width) - Size.Width;
}
}
if (location.Y + Size.Height > (screen.Top + screen.Height))
{
_resizableTop = true;
location.Y -= Size.Height + rect.Height;
}
location = control.PointToClient(location);
Show(control, location, ToolStripDropDownDirection.BelowRight);
}