public Rectangle CalcPopupRect(Rectangle filterButtonRect)
{
Rectangle popupRect = new Rectangle();
int maxWidth = 0;
int maxHeight = 0;
Graphics graphics = this.CreateGraphics();
int itemHeight = (int)Math.Round(graphics.MeasureString("0", this.filterItemsList.Font).Height) + 3;
for (int i = 0; i < this.filterItemsList.ItemCount; i++)
{
SizeF szText = graphics.MeasureString(this.filterItemsList.Items[i].ToString(), this.filterItemsList.Font);
int itemWidth = (int)Math.Round(szText.Width);
if (itemWidth > maxWidth)
{
maxWidth = itemWidth;
}
if (i < 20)
{
maxHeight += itemHeight;
}
}
maxWidth += 10;
if (maxWidth > ownerTreeList.Width / 2)
{
maxWidth = ownerTreeList.Width / 2;
}
DevExpress.XtraEditors.VScrollBar vScroll = new DevExpress.XtraEditors.VScrollBar();
int vScrollWidth = vScroll.Width;
vScroll.Dispose();
if (itemHeight * this.filterItemsList.ItemCount > maxHeight)
{
maxWidth += vScrollWidth;
}
popupRect.X = filterButtonRect.X;
popupRect.Y = filterButtonRect.Bottom;
popupRect.Location = ownerTreeList.PointToScreen(popupRect.Location);
popupRect.Width = maxWidth;
popupRect.Height = maxHeight;
Rectangle screenWorkingArea = Screen.GetWorkingArea(popupRect.Location);
if (popupRect.Right > screenWorkingArea.Right)
{
popupRect.X -= popupRect.Right - screenWorkingArea.Right;
}
if (popupRect.Bottom > screenWorkingArea.Bottom)
{
popupRect.Y = ownerTreeList.PointToScreen(filterButtonRect.Location).Y - popupRect.Height;
}
return(popupRect);
}
