Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / List.cs / 1 / List.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // Description: Implements a List element, a container for ListElementItems: ' // block elements designed to be formatted with markers such as // bullets and numbering. // // History: // 06/06/2003 : [....] - created. // 10/28/2004 : [....] - ContentElements refactoring. // //--------------------------------------------------------------------------- using System.ComponentModel; using System.Windows.Markup; using MS.Internal; using MS.Internal.PtsHost.UnsafeNativeMethods; // PTS restrictions namespace System.Windows.Documents { ////// Implements a List element, a container for ListItems: block /// elements designed to be formatted with markers such as bullets and /// numbering. /// [ContentProperty("ListItems")] public class List : Block { //------------------------------------------------------------------- // // Constructors // //------------------------------------------------------------------- #region Constructors ////// List static constructor. Registers metadata for its properties. /// static List() { DefaultStyleKeyProperty.OverrideMetadata(typeof(List), new FrameworkPropertyMetadata(typeof(List))); } ////// Initializes a new instance of a List class. /// public List() : base() { } ////// Initializes a new instance of a List class specifying its first ListItem child. /// /// /// ListItem to be inserted as a first child of this List. /// public List(ListItem listItem) : base() { if (listItem == null) { throw new ArgumentNullException("listItem"); } this.ListItems.Add(listItem); } #endregion Constructors //-------------------------------------------------------------------- // // Public Properties // //------------------------------------------------------------------- #region Public Properties ////// Collection of ListItems contained in this List. /// [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] public ListItemCollection ListItems { get { return new ListItemCollection(this, /*isOwnerParent*/true); } } ////// DependencyProperty for public static readonly DependencyProperty MarkerStyleProperty = DependencyProperty.Register( "MarkerStyle", typeof(TextMarkerStyle), typeof(List), new FrameworkPropertyMetadata( TextMarkerStyle.Disc, FrameworkPropertyMetadataOptions.AffectsMeasure | FrameworkPropertyMetadataOptions.AffectsRender), new ValidateValueCallback(IsValidMarkerStyle)); ///property. /// /// Type of bullet or number to be used by default with ListElementItems /// contained by this List /// public TextMarkerStyle MarkerStyle { get { return (TextMarkerStyle)GetValue(MarkerStyleProperty); } set { SetValue(MarkerStyleProperty, value); } } ////// DependencyProperty for public static readonly DependencyProperty MarkerOffsetProperty = DependencyProperty.Register( "MarkerOffset", typeof(double), typeof(List), new FrameworkPropertyMetadata( Double.NaN, FrameworkPropertyMetadataOptions.AffectsMeasure | FrameworkPropertyMetadataOptions.AffectsRender), new ValidateValueCallback(IsValidMarkerOffset)); ///property. /// /// Desired distance between each contained ListItem's content and /// near edge of the associated marker. /// [TypeConverter(typeof(LengthConverter))] public double MarkerOffset { get { return (double)GetValue(MarkerOffsetProperty); } set { SetValue(MarkerOffsetProperty, value); } } ////// DependencyProperty for public static readonly DependencyProperty StartIndexProperty = DependencyProperty.Register( "StartIndex", typeof(int), typeof(List), new FrameworkPropertyMetadata( 1, FrameworkPropertyMetadataOptions.AffectsMeasure | FrameworkPropertyMetadataOptions.AffectsRender), new ValidateValueCallback(IsValidStartIndex)); ///property. /// /// Item index of the first ListItem that is immediate child of /// this List. /// public int StartIndex { get { return (int)GetValue(StartIndexProperty); } set { SetValue(StartIndexProperty, value); } } #endregion Public Properties //-------------------------------------------------------------------- // // Internal Methods // //-------------------------------------------------------------------- #region Internal Methods ////// Returns the integer "index" of a specified ListItem that is an immediate child of /// this List. This index is defined to be a sequential counter of ListElementItems only /// (skipping other elements) among this List's immediate children. /// /// The list item index of the first child of type ListItem is specified by /// this.StartListIndex, which has a default value of 1. /// /// The index returned by this method is used in the formation of some ListItem /// markers such as "(b)" and "viii." (as opposed to others, like disks and wedges, /// which are not sequential-position-dependent). /// /// The item whose index is to be returned. ///Returns the index of a specified ListItem. internal int GetListItemIndex(ListItem item) { // Check for valid arg if (item == null) { throw new ArgumentNullException("item"); } if (item.Parent != this) { throw new InvalidOperationException(SR.Get(SRID.ListElementItemNotAChildOfList)); } // Count ListItem siblings (not other element types) back to first item. int itemIndex = StartIndex; TextPointer textNav = new TextPointer(this.ContentStart); while (textNav.CompareTo(this.ContentEnd) != 0) { // ListItem is a content element, so look for ElementStart runs only if (textNav.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementStart) { DependencyObject element = textNav.GetAdjacentElementFromOuterPosition(LogicalDirection.Forward); if (element is ListItem) { if (element == item) { break; } if (itemIndex < int.MaxValue) { ++itemIndex; } } // Skip entire content element content, because we are looking // only for immediate children. textNav.MoveToPosition(((TextElement)element).ElementEnd); } else { textNav.MoveToNextContextPosition(LogicalDirection.Forward); } } return itemIndex; } ////// Inserts a List around a sequence of Blocks /// starting from firstBlock ending with lastBlock. /// the List must be empty and not inserted in a tree /// before the operation /// /// /// internal void Apply(Block firstBlock, Block lastBlock) { Invariant.Assert(this.Parent == null, "Cannot Apply List Because It Is Inserted In The Tree Already."); Invariant.Assert(this.IsEmpty, "Cannot Apply List Because It Is Not Empty."); Invariant.Assert(firstBlock.Parent == lastBlock.Parent, "Cannot Apply List Because Block Are Not Siblings."); TextContainer textContainer = this.TextContainer; textContainer.BeginChange(); try { // Wrap all block items into this List element this.Reposition(firstBlock.ElementStart, lastBlock.ElementEnd); // Add ListItem elements Block block = firstBlock; while (block != null) { ListItem listItem; if (block is List) { // To wrap List into list item we pull it into previous ListItem (if any) as sublist listItem = block.ElementStart.GetAdjacentElement(LogicalDirection.Backward) as ListItem; if (listItem != null) { // Wrap the List into preceding ListItem listItem.Reposition(listItem.ContentStart, block.ElementEnd); } else { // No preceding ListItem. Create new one listItem = new ListItem(); listItem.Reposition(block.ElementStart, block.ElementEnd); } } else { // To wrap paragraph into list item we need to create a new one // listItem = new ListItem(); listItem.Reposition(block.ElementStart, block.ElementEnd); // MS Word-like heuristic: clear margin from a paragraph before wrapping it into a list item // Note: using TextContainer to make sure that undo unit is created. block.ClearValue(Block.MarginProperty); block.ClearValue(Block.PaddingProperty); block.ClearValue(Paragraph.TextIndentProperty); } // Stop when the last paragraph is covered block = block == lastBlock ? null : (Block)listItem.ElementEnd.GetAdjacentElement(LogicalDirection.Forward); } // We need to set appropriate FlowDirection property on the new List and its paragraph children. // We take the FlowDirection value from the first paragraph's FlowDirection value. TextRangeEdit.SetParagraphProperty(this.ElementStart, this.ElementEnd, Paragraph.FlowDirectionProperty, firstBlock.GetValue(Paragraph.FlowDirectionProperty)); } finally { textContainer.EndChange(); } } #endregion Internal Methods //------------------------------------------------------------------- // // Private Methods // //-------------------------------------------------------------------- #region Private Methods private static bool IsValidMarkerStyle(object o) { TextMarkerStyle value = (TextMarkerStyle)o; return value == TextMarkerStyle.None || value == TextMarkerStyle.Disc || value == TextMarkerStyle.Circle || value == TextMarkerStyle.Square || value == TextMarkerStyle.Box || value == TextMarkerStyle.LowerRoman || value == TextMarkerStyle.UpperRoman || value == TextMarkerStyle.LowerLatin || value == TextMarkerStyle.UpperLatin || value == TextMarkerStyle.Decimal; } private static bool IsValidStartIndex(object o) { int value = (int)o; return (value > 0); } private static bool IsValidMarkerOffset(object o) { double value = (double)o; double maxOffset = Math.Min(1000000, PTS.MaxPageSize); double minOffset = -maxOffset; if (Double.IsNaN(value)) { // Default return true; } if (value < minOffset || value > maxOffset) { return false; } return true; } #endregion Private Methods } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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