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//------------------------------------------------------------------------------
// <copyright file="HtmlCalendarAdapter.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
using System.Diagnostics;
using System.IO;
using System.Drawing;
using System.Web.UI.MobileControls;
using System.Security.Permissions;
using System.Globalization;
#if COMPILING_FOR_SHIPPED_SOURCE
namespace System.Web.UI.MobileControls.ShippedAdapterSource
#else
namespace System.Web.UI.MobileControls.Adapters
#endif
{
/*
* HtmlCalendarAdapter provides the html device functionality for
* Calendar control.
*
* Copyright (c) 2000 Microsoft Corporation
*/
/// <include file='doc\HtmlCalendarAdapter.uex' path='docs/doc[@for="HtmlCalendarAdapter"]/*' />
[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 HtmlCalendarAdapter : HtmlControlAdapter
{
// Insert bgcolor="Silver" right after td tag
private const int _bgColorInsertionPointInPattern = 4;
// Defines a disk in which the color White is chosen instead of Silver
private const int _bgColorDistanceTreshold = 1000;
// Search patterns for locating cells of selected dates
private const String _selectedDateSearchTableTag = "<table ";
private const String _selectedDateSearchCellTag = "<td ";
private const String _selectedDateSearchAttr = "background-color:Silver;";
/// <include file='doc\HtmlCalendarAdapter.uex' path='docs/doc[@for="HtmlCalendarAdapter.Control"]/*' />
protected new Calendar Control
{
get
{
return (Calendar)base.Control;
}
}
private int LocateNextSelectedDate(String webCalendarHtml, int startingIndex)
{
int tagBeginIndex = startingIndex;
do
{
tagBeginIndex = webCalendarHtml.IndexOf(_selectedDateSearchCellTag, tagBeginIndex, StringComparison.Ordinal);
if (tagBeginIndex >= 0)
{
int tagEndIndex = webCalendarHtml.IndexOf(">", tagBeginIndex + _bgColorInsertionPointInPattern, StringComparison.Ordinal);
Debug.Assert(tagEndIndex >= 0);
String tagComplete = webCalendarHtml.Substring(tagBeginIndex, tagEndIndex-tagBeginIndex+1);
if (tagComplete.IndexOf(_selectedDateSearchAttr, StringComparison.Ordinal) >= 0)
{
return tagBeginIndex;
}
else
{
tagBeginIndex += _bgColorInsertionPointInPattern;
}
}
}
while (tagBeginIndex >= 0);
return -1;
}
/// <include file='doc\HtmlCalendarAdapter.uex' path='docs/doc[@for="HtmlCalendarAdapter.Render"]/*' />
public override void Render(HtmlMobileTextWriter writer)
{
System.Web.UI.WebControls.WebControl webCalendar = Control.WebCalendar;
Style.ApplyTo(webCalendar);
// Delegate the rendering effort to the child Web Calendar
// control for HTML browser
webCalendar.Visible = true;
// There is no explicit property for alignment on WebForms
// Calendar, so we need some special code to set it.
writer.EnterLayout(Style);
writer.EnsureStyle();
Alignment align = (Alignment) Style[Style.AlignmentKey, true];
if (!Device.SupportsDivAlign)
{
webCalendar.Attributes["align"] = align.ToString();
}
if (Device.SupportsCss)
{
// Target device supports CSS - simply delegate the rendering
// to the underlying Web Calendar control
webCalendar.RenderControl(writer);
}
else
{
// Insert bgcolor attributes in cells that correspond to selected dates
StringWriter sw = new StringWriter(CultureInfo.InvariantCulture);
HtmlTextWriter tmpWriter = new HtmlTextWriter(sw);
webCalendar.RenderControl(tmpWriter);
String webCalendarHtml = sw.ToString();
int index = 0, indexLastTable = 0;
// Search for offset of last <table> tag in the Web Calendar HTML.
// That table contains the various days.
do
{
index = webCalendarHtml.IndexOf(_selectedDateSearchTableTag, index, StringComparison.Ordinal);
if (index >= 0)
{
indexLastTable = index;
index += 5;
}
}
while (index >= 0);
index = LocateNextSelectedDate(webCalendarHtml, indexLastTable);
if (index >= 0)
{
// Determine the background color of the containing Form control
HtmlControlAdapter formAdapter = (HtmlControlAdapter) Control.Form.Adapter;
Color backColor = (Color)formAdapter.Style[Style.BackColorKey, true];
int deltaR = System.Math.Abs(backColor.R - 0xC0);
int deltaG = System.Math.Abs(backColor.G - 0xC0);
int deltaB = System.Math.Abs(backColor.B - 0xC0);
// Determine the distance between Silver and the Form's background color
int bgColorDistance = deltaR * deltaR + deltaG * deltaG + deltaB * deltaB;
// Choose Silver or White depending on that distance
String selectedDateBGColor =
String.Format(CultureInfo.CurrentCulture, "bgcolor=\"{0}\" ", bgColorDistance < _bgColorDistanceTreshold ? "White" : "Silver");
while (index >= 0)
{
// Insert the bgcolor attribute for each selected date cell
webCalendarHtml = webCalendarHtml.Insert(index + _bgColorInsertionPointInPattern, selectedDateBGColor);
index = LocateNextSelectedDate(webCalendarHtml, index + _bgColorInsertionPointInPattern);
}
}
// Use the HTML after insertions
writer.Write(webCalendarHtml);
}
if(Control.BreakAfter)
{
writer.WriteBreak();
}
writer.ExitLayout(Style);
}
}
}
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