ToolBarOverflowPanel.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / Primitives / ToolBarOverflowPanel.cs / 1 / 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; 

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 (MS.Internal.DoubleUtil.IsNaN(v)) || (v >= 0.0d && !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)
        { 
            int i;
            Size curLineSize = new Size(); 
            Size panelSize = new Size(); 
            _wrapWidth = double.IsNaN(WrapWidth) ? constraint.Width : WrapWidth;
            UIElementCollection children = this.Children; 

            // Add ToolBar items which has IsOverflowItem = true
            ToolBar toolBar = ToolBar;
            if (toolBar != null) 
            {
                ToolBarPanel toolBarPanel = toolBar.ToolBarPanel; 
                if (toolBarPanel != null) 
                {
                    children.Clear(); 
                    List generatedItemsCollection = toolBarPanel.GeneratedItemsCollection;
                    for (i = 0; i < generatedItemsCollection.Count; i++)
                    {
                        UIElement uiElement = generatedItemsCollection[i]; 
                        if (uiElement != null && ToolBar.GetIsOverflowItem(uiElement) && !(uiElement is Separator))
                        { 
                            children.Add(uiElement); 
                        }
                    } 
                }
            }

            // Measure all children to determine if we need to increase desired wrapWidth 
            for (i = 0; i < children.Count; i++)
            { 
                UIElement child = children[i] as UIElement; 
                child.Measure(constraint);
                Size sz = child.DesiredSize; 
                if (sz.Width > _wrapWidth)
                    _wrapWidth = sz.Width;
            }
 
            // wrapWidth should not be bigger than constraint.Width
            _wrapWidth = Math.Min(_wrapWidth, constraint.Width); 
 
            for (i = 0; i < children.Count; i++)
            { 
                UIElement child = children[i] as UIElement;
                Size sz = child.DesiredSize;

                if (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 (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 (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 DesiredSize; 
        }
 
        ///  
        /// 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
        #endregion private data 
 
    }
 
}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ToolBarOverflowPanel.cs source code in C# .NET

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