public Rect MeasureTabStrip()
{
if (this.TabStrip == null)
{
throw new InvalidOperationException("TabStrip must be initialized.");
}
this.draggedTabPosition = -1;
Point topLeft = new Point(double.MaxValue, double.MaxValue);
Point bottomRight = new Point(double.MinValue, double.MinValue);
this.tabRects.Clear();
foreach (UIElement uiElement in this.TabStrip.Children)
{
TabItem tabChild = uiElement as TabItem;
if (tabChild != null)
{
this.MeasureTabItem(tabChild, ref topLeft, ref bottomRight);
ViewElement viewElement = tabChild.DataContext as ViewElement;
if (viewElement != null && viewElement == this.DraggedViewElement)
{
this.draggedTabPosition = this.tabRects.Count - 1;
}
}
}
if (topLeft.X == double.MaxValue || topLeft.Y == double.MaxValue || (bottomRight.X == double.MinValue || bottomRight.Y == double.MinValue))
{
topLeft.X = 0.0;
topLeft.Y = 0.0;
bottomRight.X = 0.0;
bottomRight.Y = 0.0;
this.tabRects.Clear();
}
this.tabStripRect = new Rect(topLeft, bottomRight);
DockTarget ancestor = Microsoft.VisualStudio.PlatformUI.ExtensionMethods.FindAncestor <DockTarget>((Visual)this.TabStrip);
if (ancestor != null && ancestor.DockTargetType == DockTargetType.Auto && ExtensionMethods.IsConnectedToPresentationSource((DependencyObject)ancestor))
{
this.tabStripRect = new Rect(ancestor.PointToScreen(new Point(0.0, 0.0)), DpiHelper.LogicalToDeviceUnits(new Size(ancestor.ActualWidth, ancestor.ActualHeight)));
}
this.NormalizeTabHeight();
return(this.tabStripRect);
}