/// <summary>
/// To fix infinity measure loop we must override MeasureOverride
/// </summary>
protected override Size MeasureOverride(Size availableSize)
{
var desiredSize = new Size();
// Don't measure the child if tabs are not ready yet or Ribbon is collapsed.
if (Ribbon == null || Ribbon.IsCollapsed)
{
return(desiredSize);
}
var remainingSpace = availableSize.Width;
var invalidateThPanel = false;
RibbonTabHeadersPanel tabHeadersPanel = null;
if (Ribbon.InternalPropertyGet("RibbonTabHeaderItemsControl") is RibbonTabHeaderItemsControl ribbonTabHeaderItemsControl)
{
tabHeadersPanel = ribbonTabHeaderItemsControl.InternalPropertyGet("InternalItemsHost") as RibbonTabHeadersPanel;
}
var tabHeadersPanelSpaceAvailable = (double?)tabHeadersPanel?.InternalPropertyGet("SpaceAvailable") ?? 0.0;
foreach (RibbonContextualTabGroup tabGroupHeader in InternalChildren)
{
double width = 0;
tabGroupHeader.InternalPropertySet("ArrangeWidth", 0);
tabGroupHeader.InternalPropertySet("ArrangeX", 0);
tabGroupHeader.InternalPropertySet("IdealDesiredWidth", 0.0);
if (tabGroupHeader.Visibility == Visibility.Visible &&
tabGroupHeader.InternalPropertyGet("FirstVisibleTab") != null &&
remainingSpace > double.Epsilon)
{
// Measure the maximum desired width
// TabHeaders should be padded up more if needed.
// Also we need to determine if we need to show the label tooltip
tabGroupHeader.Measure(new Size(double.PositiveInfinity, availableSize.Height));
tabGroupHeader.InternalPropertySet("IdealDesiredWidth", tabGroupHeader.DesiredSize.Width);
// If TabHeadersPanel has space to expand, then invalidate it so that TabHeaders add extra Padding to themselves.
var idealDesiredWidth = (double)tabGroupHeader.InternalPropertyGet("IdealDesiredWidth");
var tabsDesiredWidth = (double)tabGroupHeader.InternalPropertyGet("TabsDesiredWidth");
var desiredExtraPadding = idealDesiredWidth - tabsDesiredWidth;
var desiredExtraPaddingFromPreviousMeasure = GetDesiredExtraPadding(tabGroupHeader);
// Bug fix for infinity measure loop when tabs group panel could not extend its size.
if (Math.Abs(desiredExtraPaddingFromPreviousMeasure - desiredExtraPadding) > double.Epsilon &&
desiredExtraPadding > double.Epsilon &&
tabHeadersPanelSpaceAvailable > double.Epsilon)
{
//Remember desiredExtraPadding for current tabGroupHeader
SetDesiredExtraPadding(tabGroupHeader, desiredExtraPadding);
invalidateThPanel = true;
}
else
{
//Clear desiredExtraPadding for current tabGroupHeader
SetDesiredExtraPadding(tabGroupHeader, 0);
}
width = tabsDesiredWidth;
// If the difference between tabGroupHeader.TabsDesiredWidth and remainingSpace is less
// than 1e-10 then assume that both are same. This is because TextBlock is very sensitive to
// even a minute floating point difference and displays ellipsis even when sufficient
// space is available.
if (Math.Abs(tabsDesiredWidth - remainingSpace) > double.Epsilon)
{
// Clip on the left side
width = Math.Min(tabsDesiredWidth, remainingSpace);
}
tabGroupHeader.InternalPropertySet("ArrangeWidth", width);
tabGroupHeader.Measure(new Size(width, availableSize.Height));
// If label is truncated - show the tooltip
idealDesiredWidth = (double)tabGroupHeader.InternalPropertyGet("IdealDesiredWidth");
tabGroupHeader.InternalPropertySet("ShowLabelToolTip", idealDesiredWidth > width);
remainingSpace = remainingSpace - width;
}
desiredSize.Width += width;
desiredSize.Height = Math.Max(desiredSize.Height, tabGroupHeader.DesiredSize.Height);
}
var waitingForMeasure = (bool)this.InternalPropertyGet("WaitingForMeasure");
if (waitingForMeasure || invalidateThPanel)
{
tabHeadersPanel?.InvalidateMeasure();
}
return(desiredSize);
}
protected override Size MeasureOverride(Size availableSize)
{
Size desiredSize = new Size();
// Don't measure the child if tabs are not ready yet or Ribbon is collapsed.
if (Ribbon != null && !Ribbon.IsCollapsed)
{
double remainingSpace = availableSize.Width;
bool invalidateTHPanel = false;
RibbonTabHeadersPanel tabHeadersPanel = null;
if (Ribbon.RibbonTabHeaderItemsControl != null)
{
tabHeadersPanel = Ribbon.RibbonTabHeaderItemsControl.InternalItemsHost as RibbonTabHeadersPanel;
}
double tabHeadersPanelSpaceAvailable = (tabHeadersPanel != null) ? tabHeadersPanel.SpaceAvailable : 0.0;
foreach (RibbonContextualTabGroup tabGroupHeader in InternalChildren)
{
double width = 0;
tabGroupHeader.ArrangeWidth = 0;
tabGroupHeader.ArrangeX = 0;
tabGroupHeader.IdealDesiredWidth = 0.0;
if (tabGroupHeader.Visibility == Visibility.Visible && tabGroupHeader.FirstVisibleTab != null && DoubleUtil.GreaterThanOrClose(remainingSpace, 0.0))
{
// Measure the maximum desired width
// TabHeaders should be padded up more if needed.
// Also we need to determine if we need to show the label tooltip
tabGroupHeader.Measure(new Size(double.PositiveInfinity, availableSize.Height));
tabGroupHeader.IdealDesiredWidth = tabGroupHeader.DesiredSize.Width;
// If TabHeadersPanel has space to expand, then invalidate it so that TabHeaders add extra Padding to themselves.
double desiredExtraPadding = tabGroupHeader.IdealDesiredWidth - tabGroupHeader.TabsDesiredWidth;
if (DoubleUtil.GreaterThan(desiredExtraPadding, 0.0) &&
DoubleUtil.GreaterThan(tabHeadersPanelSpaceAvailable, 0.0))
{
invalidateTHPanel = true;
}
width = tabGroupHeader.TabsDesiredWidth;
// If the difference between tabGroupHeader.TabsDesiredWidth and remainingSpace is less
// than 1e-10 then assume that both are same. This is because TextBlock is very sensitive to
// even a minute floating point difference and displays ellipsis even when sufficient
// space is available.
if (Math.Abs(tabGroupHeader.TabsDesiredWidth - remainingSpace) > _desiredWidthEpsilon)
{
// Clip on the left side
width = Math.Min(tabGroupHeader.TabsDesiredWidth, remainingSpace);
}
tabGroupHeader.ArrangeWidth = width;
tabGroupHeader.Measure(new Size(width, availableSize.Height));
// If label is truncated - show the tooltip
tabGroupHeader.ShowLabelToolTip = DoubleUtil.GreaterThan(tabGroupHeader.IdealDesiredWidth, width);
remainingSpace = remainingSpace - width;
}
desiredSize.Width += width;
desiredSize.Height = Math.Max(desiredSize.Height, tabGroupHeader.DesiredSize.Height);
}
if (WaitingForMeasure || invalidateTHPanel)
{
if (tabHeadersPanel != null)
{
tabHeadersPanel.InvalidateMeasure();
}
}
}
return(desiredSize);
}
