// Licensed to the .NET Foundation under one or more agreements. // The .NET Foundation licenses this file to you under the MIT license. // See the LICENSE file in the project root for more information. using MS.Internal; using System.Windows.Controls.Primitives; using System.Windows.Media; #if RIBBON_IN_FRAMEWORK using Microsoft.Windows.Controls; #if RIBBON_IN_FRAMEWORK namespace System.Windows.Controls.Ribbon.Primitives #else namespace Microsoft.Windows.Controls.Ribbon.Primitives #endif { #endif public class RibbonContextualTabGroupsPanel : Panel { static RibbonContextualTabGroupsPanel() { } #region Protected Methods 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; } protected override Size ArrangeOverride(Size finalSize) { double startX = 0.0; foreach (RibbonContextualTabGroup tabGroupHeader in InternalChildren) { double width = Math.Max(tabGroupHeader.ArrangeWidth,0); double height = tabGroupHeader.DesiredSize.Height; double y = finalSize.Height - height; tabGroupHeader.ArrangeX = startX; tabGroupHeader.Arrange(new Rect(startX, y, width, Math.Max(0.0, height - 1))); startX += width; } InvalidateVisual(); // Ensure OnRender is called to draw the separators return finalSize; } /// <summary> /// Draws separators for the RibbonContextualTabGroups. /// </summary> /// <param name="drawingContext">The drawing context to use.</param> protected override void OnRender(DrawingContext drawingContext) { if (!SystemParameters.HighContrast) { // Calculate separatorHeight double separatorHeight = 0.0; if (Ribbon != null && Ribbon.RibbonTabHeaderItemsControl != null && Ribbon.RibbonTabHeaderItemsControl.InternalItemsHost != null) { separatorHeight = Ribbon.RibbonTabHeaderItemsControl.InternalItemsHost.ActualHeight - RibbonContextualTabGroup.TabHeaderSeparatorHeightDelta; } Pen separatorPen = SeparatorPen; if (separatorPen != null) { foreach (RibbonContextualTabGroup tabGroupHeader in InternalChildren) { if (tabGroupHeader.Visibility == Visibility.Visible && tabGroupHeader.ArrangeWidth > 0) { double startX = tabGroupHeader.ArrangeX; if (DoubleUtil.AreClose(startX, 0.0)) { // For the first group, draw to the left as well drawingContext.DrawLine(separatorPen, new Point(startX, ActualHeight), new Point(startX, this.ActualHeight + separatorHeight)); } // draw separator to the right at _group.DesiredWidth drawingContext.DrawLine(separatorPen, new Point(startX + tabGroupHeader.TabsDesiredWidth, ActualHeight), new Point(startX + tabGroupHeader.TabsDesiredWidth, this.ActualHeight + separatorHeight)); } } } } base.OnRender(drawingContext); } /// <summary> /// This method is invoked when the IsItemsHost property changes. /// </summary> /// <param name="oldIsItemsHost">The old value of the IsItemsHost property.</param> /// <param name="newIsItemsHost">The new value of the IsItemsHost property.</param> protected override void OnIsItemsHostChanged(bool oldIsItemsHost, bool newIsItemsHost) { base.OnIsItemsHostChanged(oldIsItemsHost, newIsItemsHost); if (newIsItemsHost) { RibbonContextualTabGroupItemsControl groupHeaderItemsControl = ParentItemsControl; if (groupHeaderItemsControl != null) { IItemContainerGenerator generator = groupHeaderItemsControl.ItemContainerGenerator as IItemContainerGenerator; if (generator != null && generator.GetItemContainerGeneratorForPanel(this) == generator) { groupHeaderItemsControl.InternalItemsHost = this; } } } else { RibbonContextualTabGroupItemsControl groupHeaderItemsControl = ParentItemsControl; if (groupHeaderItemsControl != null && groupHeaderItemsControl.InternalItemsHost == this) { groupHeaderItemsControl.InternalItemsHost = null; } } } #endregion #region Private Members /// <summary> /// DependencyProperty for Ribbon property. /// </summary> public static readonly DependencyProperty RibbonProperty = RibbonControlService.RibbonProperty.AddOwner(typeof(RibbonContextualTabGroupsPanel)); /// <summary> /// This property is used to access visual style brushes defined on the Ribbon class. /// </summary> public Ribbon Ribbon { get { return RibbonControlService.GetRibbon(this); } } /// <summary> /// The parent ItemsControl /// </summary> private RibbonContextualTabGroupItemsControl ParentItemsControl { get { return TreeHelper.FindTemplatedAncestor<RibbonContextualTabGroupItemsControl>(this); } } /// <summary> /// RibbonTabHeadersPanels (THPanel) and RibbonContextualTabGroupsPanel (CTGHPanel) Measure are interdependent. /// CTGHPanel's Measure requires THPanel to be measured. Hence THPanel always call InvalidateMeasure on CTGHPanel after its Measure. /// THPanel's Measure requires that CTGHPanel's containers are generated. /// If they are not, then THPanel sets this flag to indicate that it is waiting on CTGHPanel.Measure. /// CTGHPanel checks this flag and then InvalidatesMeasure on THPanel. THPanel unsets this flag after a successful Measure. /// We need this flag to avoid an infinite loop between THPanel.Measure and CTGHPanel.Measure. /// </summary> internal bool WaitingForMeasure { get; set; } private Pen SeparatorPen { get { if (_separatorPen == null) { Ribbon ribbon = Ribbon; if (ribbon != null && ribbon.BorderBrush != null) { Brush b = ribbon.BorderBrush.Clone(); _separatorPen = new Pen(b, 1.0); } } return _separatorPen; } } internal void OnNotifyRibbonBorderBrushChanged() { _separatorPen = null; InvalidateVisual(); } Pen _separatorPen; private const double _desiredWidthEpsilon = 1e-10; #endregion } } |