private void SetupVisiblePlacementWidth(IEnumerable <DependencyObject> visualAncestry)
{
var parent = visualAncestry.OfType <Panel>().ElementAt(1);
VisiblePlacementWidth = TreeHelper.GetVisibleWidth((FrameworkElement)PlacementTarget, parent);
}
private CustomPopupPlacement[] ComboBoxCustomPopupPlacementCallback(Size popupSize, Size targetSize,
Point offset)
{
var locationFromScreen = this.PlacementTarget.PointToScreen(new Point(0, 0));
var mainVisual = PlacementTarget.GetVisualAncestry().OfType <Visual>().LastOrDefault();
if (mainVisual == null)
{
return(new CustomPopupPlacement[0]);
}
var screenWidth = (int)DpiHelper.TransformToDeviceX(mainVisual, SystemParameters.PrimaryScreenWidth);
var screenHeight = (int)DpiHelper.TransformToDeviceY(mainVisual, SystemParameters.PrimaryScreenHeight);
var locationX = (int)locationFromScreen.X % screenWidth;
var locationY = (int)locationFromScreen.Y % screenHeight;
var realOffsetX = (popupSize.Width - targetSize.Width) / 2.0;
double offsetX;
const int rtlHorizontalOffset = 20;
if (FlowDirection == FlowDirection.LeftToRight)
{
offsetX = DpiHelper.TransformToDeviceX(mainVisual, offset.X);
}
else
{
offsetX = DpiHelper.TransformToDeviceX(mainVisual,
offset.X - targetSize.Width - rtlHorizontalOffset);
}
var defaultVerticalOffsetIndepent = DpiHelper.TransformToDeviceY(mainVisual, DefaultVerticalOffset);
var upVerticalOffsetIndepent = DpiHelper.TransformToDeviceY(mainVisual, UpVerticalOffset);
var downVerticalOffsetIndepent = DpiHelper.TransformToDeviceY(mainVisual, DownVerticalOffset);
var parent = this.PlacementTarget.GetVisualAncestry().OfType <Panel>().ElementAt(1);
VisiblePlacementWidth = TreeHelper.GetVisibleWidth((FrameworkElement)PlacementTarget, parent);
if (locationX + popupSize.Width - realOffsetX > screenWidth ||
locationX + realOffsetX < 0)
{
SetChildTemplateIfNeed(DefaultContentTemplate);
var newY = locationY + popupSize.Height > screenHeight
? -(defaultVerticalOffsetIndepent + popupSize.Height)
: defaultVerticalOffsetIndepent + targetSize.Height;
return(new[] { new CustomPopupPlacement(new Point(offsetX, newY), PopupPrimaryAxis.Horizontal) });
}
if (locationY + popupSize.Height > screenHeight)
{
SetChildTemplateIfNeed(UpContentTemplate);
var newY = upVerticalOffsetIndepent - popupSize.Height + targetSize.Height;
return(new[] { new CustomPopupPlacement(new Point(offsetX, newY), PopupPrimaryAxis.None) });
}
else
{
SetChildTemplateIfNeed(DownContentTemplate);
var newY = downVerticalOffsetIndepent;
return(new[] { new CustomPopupPlacement(new Point(offsetX, newY), PopupPrimaryAxis.None) });
}
}