/// <summary>
/// Find the corresponding <see cref="TextRange"/> instance
/// representing the input string given a specified text pointer position.
/// </summary>
/// <param name="position">the current text position</param>
/// <param name="textToFind">input text</param>
/// <param name="findOptions">the search option</param>
/// <returns>An <see cref="TextRange"/> instance represeneting the matching string withing the text container.</returns>
public TextRange GetTextRangeFromPosition(ref TextPointer position, String input, FindOptions findOptions)
{
Boolean matchCase = findOptions.MatchCase;
Boolean matchWholeWord = findOptions.MatchWholeWord;
TextRange textRange = null;
while (position != null)
{
if (position.CompareTo(inputDocument.ContentEnd) == 0) //到了文档结尾
{
break;
}
//是文本元素
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
String textRun = position.GetTextInRun(LogicalDirection.Forward); //读取文本
StringComparison stringComparison = matchCase ? StringComparison.CurrentCulture : StringComparison.CurrentCultureIgnoreCase;
//进行查找
Int32 indexInRun = textRun.IndexOf(input, stringComparison);
if (indexInRun >= 0) //找到了
{
position = position.GetPositionAtOffset(indexInRun); //移动文字指针到开头
TextPointer nextPointer = position.GetPositionAtOffset(input.Length); //设定匹配项尾文字指针
textRange = new TextRange(position, nextPointer);
if (matchWholeWord) //是全字匹配的话
{
if (IsWholeWord(textRange)) // 测试匹配项是否是一个单词
{
// 是一个完整的单词
break;
}
else
{
// 找到的不是一个完整的单词,继续在本Run元素中查找
position = position.GetPositionAtOffset(input.Length);
return GetTextRangeFromPosition(ref position, input, findOptions);
}
}
else
{
//不要求全字匹配
position = position.GetPositionAtOffset(input.Length);
break;
}
}
else
{
// 没找到匹配项,移到当前的Run元素之后 "textRun".
position = position.GetPositionAtOffset(textRun.Length);
}
}
else
{
//如果当前位置不是文本类型的元素,继续"前进",跳过这些非文本元素.
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
}
return textRange;
}
/// <summary>
/// 按照搜索选项查找下一个匹配项
/// </summary>
/// <param name="input">要查找的字串</param>
/// <param name="findOptions">搜索选项</param>
/// <returns>找到的匹配项</returns>
/// <remarks>
/// 此方法将移动文字指针
/// </remarks>
public TextRange FindNext(String input, FindOptions findOptions)
{
TextRange textRange = GetTextRangeFromPosition(ref currentPosition, input, findOptions);
return textRange;
}
/// <summary>
/// 根据搜索选项在文档中查找并替换全部匹配字串
/// </summary>
/// <param name="input">要查找的字串</param>
/// <param name="replacement">用于替换的字串</param>
/// <param name="findOptions">搜索选项 </param>
/// <returns>进行了替换的次数</returns>
/// <remarks>
/// 此方法将移动文字指针到最后位置
/// </remarks>
public int ReplaceAll(String input, String replacement, FindOptions findOptions)
{
int count = 0;
currentPosition = inputDocument.ContentStart;
while (currentPosition.CompareTo(inputDocument.ContentEnd) < 0)
{
TextRange textRange = Replace(input, replacement, findOptions);
if (textRange != null)
{
count++;
}
}
return count;
}
/// <summary>
/// 根据搜索选项在文档中查找并替换字串
/// </summary>
/// <param name="input">要查找的字串</param>
/// <param name="replacement">用于替换的字串</param>
/// <param name="findOptions">搜索选项 </param>
/// <returns>刚刚完成替换工作的匹配项</returns>
/// <remarks>
/// 此方法将移动文字指针
/// </remarks>
public TextRange Replace(String input, String replacement, FindOptions findOptions)
{
TextRange textRange = FindNext(input, findOptions);
if (textRange != null)
{
textRange.Text = replacement;
}
return textRange;
}
/// <summary>
/// 按照搜索选项查找下一个匹配项
/// </summary>
/// <param name="input">要查找的字串</param>
/// <param name="findOptions">搜索选项</param>
/// <returns>找到的匹配项</returns>
/// <remarks>
/// 此方法将移动文字指针
/// </remarks>
public TextRange FindNext(String input, FindOptions findOptions)
{
TextRange textRange = GetTextRangeFromPosition(ref currentPosition, input, findOptions);
return(textRange);
}
/// <summary>
/// Find the corresponding <see cref="TextRange"/> instance
/// representing the input string given a specified text pointer position.
/// </summary>
/// <param name="position">the current text position</param>
/// <param name="textToFind">input text</param>
/// <param name="findOptions">the search option</param>
/// <returns>An <see cref="TextRange"/> instance represeneting the matching string withing the text container.</returns>
public TextRange GetTextRangeFromPosition(ref TextPointer position, String input, FindOptions findOptions)
{
Boolean matchCase = findOptions.MatchCase;
Boolean matchWholeWord = findOptions.MatchWholeWord;
TextRange textRange = null;
while (position != null)
{
if (position.CompareTo(inputDocument.ContentEnd) == 0) //到了文档结尾
{
break;
}
//是文本元素
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
String textRun = position.GetTextInRun(LogicalDirection.Forward); //读取文本
StringComparison stringComparison = matchCase ? StringComparison.CurrentCulture : StringComparison.CurrentCultureIgnoreCase;
//进行查找
Int32 indexInRun = textRun.IndexOf(input, stringComparison);
if (indexInRun >= 0) //找到了
{
position = position.GetPositionAtOffset(indexInRun); //移动文字指针到开头
TextPointer nextPointer = position.GetPositionAtOffset(input.Length); //设定匹配项尾文字指针
textRange = new TextRange(position, nextPointer);
if (matchWholeWord) //是全字匹配的话
{
if (IsWholeWord(textRange)) // 测试匹配项是否是一个单词
{
// 是一个完整的单词
break;
}
else
{
// 找到的不是一个完整的单词,继续在本Run元素中查找
position = position.GetPositionAtOffset(input.Length);
return(GetTextRangeFromPosition(ref position, input, findOptions));
}
}
else
{
//不要求全字匹配
position = position.GetPositionAtOffset(input.Length);
break;
}
}
else
{
// 没找到匹配项,移到当前的Run元素之后 "textRun".
position = position.GetPositionAtOffset(textRun.Length);
}
}
else
{
//如果当前位置不是文本类型的元素,继续"前进",跳过这些非文本元素.
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
}
return(textRange);
}
