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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / MIT / System / Web / UI / MobileControls / LiteralText.cs / 1305376 / LiteralText.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System; using System.ComponentModel; using System.ComponentModel.Design; using System.Drawing; using System.Web; using System.Web.UI; using System.Web.UI.Design.WebControls; using System.Web.UI.HtmlControls; using System.Security.Permissions; namespace System.Web.UI.MobileControls { /* * Literal Text class. This is the control created for literal text in a form. * * Copyright (c) 2000 Microsoft Corporation */ ///[ ControlBuilderAttribute(typeof(LiteralTextControlBuilder)), ToolboxItem(false) ] [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")] public class LiteralText : PagedControl { // Note that this value doesn't relate to device specific info // because this is simply a unit size to define how many characters // to be counted as an item for pagination. Depending on each // device's page weight, different numbers of items will be returned // for display. private static readonly int PagingUnitSize = ControlPager.DefaultWeight; // chars /// [ Bindable(false), Browsable(false), ] public String Text { // Override MobileControl default behavior for InnerText get { String s = (String)ViewState[MobileControl.InnerTextViewStateKey]; return s != null ? s : InnerText; } set { ViewState[MobileControl.InnerTextViewStateKey] = value; } } // this attempts to split on word, return or sentence boundaries. // use of '.' to indicate end of sentence assumes western languages // perhaps if we get rid of '.' logic, '\n' preference will be sufficient private int CalculateOffset(int itemIndex) { if (itemIndex == 0) { return 0; } int length = Text.Length; int itemSize = (length / InternalItemCount) + 1; int baseOffset = itemSize * itemIndex; if (baseOffset >= length) { return length; } // this code scans to find an optimal break location. String text = this.Text; int scanLength = itemSize / 2; int scanStop = baseOffset - scanLength; int foundSpace = -1; int foundReturn = -1; int lastChar = -1; for (int offset = baseOffset; offset > scanStop; offset--) { char c = text[offset]; if (c == '.' && Char.IsWhiteSpace((char)lastChar)) { // this may exceed baseOffset by 1, but will never exceed totalChars return offset + 1; } else if (foundReturn < 0 && c == '\n') { foundReturn = offset; } else if (foundSpace < 0 && Char.IsWhiteSpace(c)) // check performance of this { foundSpace = offset; } lastChar = c; } if (foundReturn > 0) { return foundReturn; } else if (foundSpace > 0) { return foundSpace; } return baseOffset; } /// public String PagedText { get { int index = FirstVisibleItemIndex; int count = VisibleItemCount; String text = Text; if (count > text.Length) { return text; } int start = CalculateOffset(index); int stop = CalculateOffset(index + count); // If not at the beginning or end, skip spaces. if (start > 0) { while (start < stop && Char.IsWhiteSpace(text[start]) ) { start++; } } if (stop < text.Length) { while (Char.IsWhiteSpace(text[stop - 1]) && stop > start) { stop--; } } return (stop > start) ? text.Substring(start, stop - start) : String.Empty; } } /// protected override int InternalItemCount { get { return ((Text.Length / PagingUnitSize) + (((Text.Length % PagingUnitSize) > 0) ? 1 : 0)); } } /// protected override int ItemWeight { get { return PagingUnitSize; } } internal override bool TrimInnerText { get { return false; } } } /* * Control builder for literal text. * * Copyright (c) 2000 Microsoft Corporation */ /// [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")] public class LiteralTextControlBuilder : MobileControlBuilder { /// public override bool AllowWhitespaceLiterals() { return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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