Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / Primitives / ToolBarOverflowPanel.cs / 1305600 / ToolBarOverflowPanel.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System.Collections.Generic; using System.Threading; using System.Windows; using System.Windows.Controls; using System.Windows.Media; using System.Windows.Shapes; using System.Windows.Documents; using System; using System.Diagnostics; using MS.Internal; namespace System.Windows.Controls.Primitives { ////// ToolBarOverflowPanel /// public class ToolBarOverflowPanel : Panel { #region Properties ////// WrapWidth Property /// public static readonly DependencyProperty WrapWidthProperty = DependencyProperty.Register( "WrapWidth", typeof(double), typeof(ToolBarOverflowPanel), new FrameworkPropertyMetadata(Double.NaN, FrameworkPropertyMetadataOptions.AffectsMeasure), new ValidateValueCallback(IsWrapWidthValid)); ////// WrapWidth Property /// public double WrapWidth { get { return (double)GetValue(WrapWidthProperty); } set { SetValue(WrapWidthProperty, value); } } private static bool IsWrapWidthValid(object value) { double v = (double)value; return (DoubleUtil.IsNaN(v)) || (DoubleUtil.GreaterThanOrClose(v, 0d) && !Double.IsPositiveInfinity(v)); } #endregion Properties #region Override methods ////// Measure the content and store the desired size of the content /// /// ///protected override Size MeasureOverride(Size constraint) { Size curLineSize = new Size(); _panelSize = new Size(); _wrapWidth = double.IsNaN(WrapWidth) ? constraint.Width : WrapWidth; UIElementCollection children = InternalChildren; int childrenCount = children.Count; // Add ToolBar items which have IsOverflowItem = true ToolBarPanel toolBarPanel = ToolBarPanel; if (toolBarPanel != null) { // Go through the generated items collection and add to the children collection // any that are marked IsOverFlowItem but aren't already in the children collection. // // The order of both collections matters. // // It is assumed that any children that were removed from generated items will have // already been removed from the children collection. List generatedItemsCollection = toolBarPanel.GeneratedItemsCollection; int generatedItemsCount = (generatedItemsCollection != null) ? generatedItemsCollection.Count : 0; int childrenIndex = 0; for (int i = 0; i < generatedItemsCount; i++) { UIElement child = generatedItemsCollection[i]; if ((child != null) && ToolBar.GetIsOverflowItem(child) && !(child is Separator)) { if (childrenIndex < childrenCount) { if (children[childrenIndex] != child) { children.Insert(childrenIndex, child); childrenCount++; } } else { children.Add(child); childrenCount++; } childrenIndex++; } } Debug.Assert(childrenIndex == childrenCount, "ToolBarOverflowPanel.Children count mismatch after transferring children from GeneratedItemsCollection."); } // Measure all children to determine if we need to increase desired wrapWidth for (int i = 0; i < childrenCount; i++) { UIElement child = children[i] as UIElement; child.Measure(constraint); Size childDesiredSize = child.DesiredSize; if (DoubleUtil.GreaterThan(childDesiredSize.Width, _wrapWidth)) { _wrapWidth = childDesiredSize.Width; } } // wrapWidth should not be bigger than constraint.Width _wrapWidth = Math.Min(_wrapWidth, constraint.Width); for (int i = 0; i < children.Count; i++) { UIElement child = children[i] as UIElement; Size sz = child.DesiredSize; if (DoubleUtil.GreaterThan(curLineSize.Width + sz.Width, _wrapWidth)) //need to switch to another line { _panelSize.Width = Math.Max(curLineSize.Width, _panelSize.Width); _panelSize.Height += curLineSize.Height; curLineSize = sz; if (DoubleUtil.GreaterThan(sz.Width, _wrapWidth)) //the element is wider then the constraint - give it a separate line { _panelSize.Width = Math.Max(sz.Width, _panelSize.Width); _panelSize.Height += sz.Height; curLineSize = new Size(); } } else //continue to accumulate a line { curLineSize.Width += sz.Width; curLineSize.Height = Math.Max(sz.Height, curLineSize.Height); } } //the last line size, if any should be added _panelSize.Width = Math.Max(curLineSize.Width, _panelSize.Width); _panelSize.Height += curLineSize.Height; return _panelSize; } /// /// Content arrangement. /// /// ///protected override Size ArrangeOverride(Size arrangeBounds) { int firstInLine = 0; Size curLineSize = new Size(); double accumulatedHeight = 0d; _wrapWidth = Math.Min(_wrapWidth, arrangeBounds.Width); UIElementCollection children = this.Children; for (int i = 0; i < children.Count; i++) { Size sz = children[i].DesiredSize; if (DoubleUtil.GreaterThan(curLineSize.Width + sz.Width, _wrapWidth)) //need to switch to another line { // Arrange the items in the current line not including the current arrangeLine(accumulatedHeight, curLineSize.Height, firstInLine, i); accumulatedHeight += curLineSize.Height; // Current item will be first on the next line firstInLine = i; curLineSize = sz; } else //continue to accumulate a line { curLineSize.Width += sz.Width; curLineSize.Height = Math.Max(sz.Height, curLineSize.Height); } } arrangeLine(accumulatedHeight, curLineSize.Height, firstInLine, children.Count); return _panelSize; } /// /// Creates a new UIElementCollection. Panel-derived class can create its own version of /// UIElementCollection -derived class to add cached information to every child or to /// intercept any Add/Remove actions (for example, for incremental layout update) /// protected override UIElementCollection CreateUIElementCollection(FrameworkElement logicalParent) { // we ignore the Logical Parent (this) if we have ToolBar as our TemplatedParent return new UIElementCollection(this, TemplatedParent == null ? logicalParent : null); } private void arrangeLine(double y, double lineHeight, int start, int end) { double x = 0; UIElementCollection children = this.Children; for (int i = start; i < end; i++) { UIElement child = children[i]; child.Arrange(new Rect(x, y, child.DesiredSize.Width, lineHeight)); x += child.DesiredSize.Width; } } #endregion Override methods #region private implementation private ToolBar ToolBar { get { return TemplatedParent as ToolBar; } } private ToolBarPanel ToolBarPanel { get { ToolBar tb = ToolBar; return tb == null ? null : tb.ToolBarPanel; } } #endregion private implementation #region private data private double _wrapWidth; // calculated in MeasureOverride and used in ArrangeOverride private Size _panelSize; #endregion private data } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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