/// <summary>
/// Move to the next highlight starting at the <paramref name="caretPosition"/>
/// </summary>
/// <param name="forward">true for next false for previous</param>
/// <param name="caretPosition">caret position</param>
/// <returns>the next highlight starting at the <paramref name="caretPosition"/></returns>
internal Run MoveAndHighlightNextNextMatch(bool forward, TextPointer caretPosition)
{
Debug.Assert(caretPosition != null, "a caret position is allways valid");
Debug.Assert(caretPosition.Parent != null && caretPosition.Parent is Run, "a caret PArent is allways a valid Run");
Run caretRun = (Run)caretPosition.Parent;
Run currentRun;
if (this.currentHighlightedMatch != null)
{
// restore the curent highlighted background to plain highlighted
this.currentHighlightedMatch.Background = ParagraphSearcher.HighlightBrush;
}
// If the caret is in the end of a highlight we move to the adjacent run
// It has to be in the end because if there is a match at the begining of the file
// and the caret has not been touched (so it is in the beginning of the file too)
// we want to highlight this first match.
// Considering the caller allways set the caret to the end of the highlight
// The condition below works well for successive searchs
// We also need to move to the adjacent run if the caret is at the first run and we
// are moving backwards so that a search backwards when the first run is highlighted
// and the caret is at the beginning will wrap to the end
if ((!forward && IsFirstRun(caretRun)) ||
((caretPosition.GetOffsetToPosition(caretRun.ContentEnd) == 0) && ParagraphSearcher.Ishighlighted(caretRun)))
{
currentRun = ParagraphSearcher.GetNextRun(caretRun, forward);
}
else
{
currentRun = caretRun;
}
currentRun = ParagraphSearcher.GetNextMatch(currentRun, forward);
if (currentRun == null)
{
// if we could not find a next highlight wrap arround
currentRun = ParagraphSearcher.GetFirstOrLastRun(caretRun, forward);
currentRun = ParagraphSearcher.GetNextMatch(currentRun, forward);
}
this.currentHighlightedMatch = currentRun;
if (this.currentHighlightedMatch != null)
{
// restore the curent highligthed background to current highlighted
this.currentHighlightedMatch.Background = ParagraphSearcher.CurrentHighlightBrush;
}
return(currentRun);
}
/// <summary>
/// Gets the next highlighted run starting and including <paramref name="currentRun"/>
/// according to the direction specified in <paramref name="forward"/>
/// </summary>
/// <param name="currentRun">the current run</param>
/// <param name="forward">true for next false for previous</param>
/// <returns>
/// the next highlighted run starting and including <paramref name="currentRun"/>
/// according to the direction specified in <paramref name="forward"/>
/// </returns>
private static Run GetNextMatch(Run currentRun, bool forward)
{
while (currentRun != null)
{
if (ParagraphSearcher.Ishighlighted(currentRun))
{
return(currentRun);
}
currentRun = ParagraphSearcher.GetNextRun(currentRun, forward);
}
return(currentRun);
}