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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / IO / Packaging / xmlfixedPageInfo.cs / 1 / xmlfixedPageInfo.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // Implements a DOM-based subclass of the FixedPageInfo abstract class. // The class functions as an array of XmlGlyphRunInfo's in markup order. // // History: // 05/06/2004: [....]: Initial implementation //--------------------------------------------------------------------------- using System; using System.Windows; // For ExceptionStringTable using System.Xml; // For DOM objects using System.Diagnostics; // For Assert using System.Globalization; // For CultureInfo namespace MS.Internal.IO.Packaging { internal class XmlFixedPageInfo : MS.Internal.FixedPageInfo { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors ////// Initialize object from DOM node. /// ////// The DOM node is assumed to be a XAML FixedPage element. Its namespace URI /// is subsequently used to look for its nested Glyphs elements (see private property NodeList). /// internal XmlFixedPageInfo(XmlNode fixedPageNode) { _pageNode = fixedPageNode; Debug.Assert(_pageNode != null); if (_pageNode.LocalName != _fixedPageName || _pageNode.NamespaceURI != ElementTableKey.FixedMarkupNamespace) { throw new ArgumentException(SR.Get(SRID.UnexpectedXmlNodeInXmlFixedPageInfoConstructor, _pageNode.NamespaceURI, _pageNode.LocalName, ElementTableKey.FixedMarkupNamespace, _fixedPageName)); } } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- #region Internal Methods ////// Get the glyph run at zero-based position 'position'. /// ////// Returns null for a nonexistent position. No exception raised. /// internal override GlyphRunInfo GlyphRunAtPosition(int position) { if (position < 0 || position >= GlyphRunList.Length) { return null; } if (GlyphRunList[position] == null) { GlyphRunList[position] = new XmlGlyphRunInfo(NodeList[position]); } return GlyphRunList[position]; } #endregion Internal Methods //------------------------------------------------------ // // Internal Properties // //------------------------------------------------------ #region Internal Properties ////// Indicates the number of glyph runs on the page. /// internal override int GlyphRunCount { get { return GlyphRunList.Length; } } #endregion Internal Properties //----------------------------------------------------- // // Private Properties // //------------------------------------------------------ #region Private Properties ////// Lazily initialize _glyphRunList, an array of XmlGlyphInfo objects, /// using the NodeList private property. /// ////// When using Visual Studio to step through code using this property, make sure the option /// "Allow property evaluation in variables windows" is unchecked. /// private XmlGlyphRunInfo[] GlyphRunList { get { if (_glyphRunList == null) { _glyphRunList = new XmlGlyphRunInfo[NodeList.Count]; } return _glyphRunList; } } ////// Lazily initialize the list of Glyphs elements on the page using XPath. /// ////// When using Visual Studio to step through code using this property, make sure the option /// "Allow property evaluation in variables windows" is unchecked. /// private XmlNodeList NodeList { get { if (_nodeList == null) { string glyphRunQuery = String.Format(CultureInfo.InvariantCulture, ".//*[namespace-uri()='{0}' and local-name()='{1}']", ElementTableKey.FixedMarkupNamespace, _glyphRunName); _nodeList = _pageNode.SelectNodes(glyphRunQuery); } return _nodeList; } } #endregion Private Properties //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- #region Private Fields #region Constants private const string _fixedPageName = "FixedPage"; private const string _glyphRunName = "Glyphs"; #endregion Constants private XmlNode _pageNode; private XmlNodeList _nodeList = null; private XmlGlyphRunInfo[] _glyphRunList = null; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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