char BackSpaceOneChar()
{
if (CurrentTextRun == null)
{
return('\0');
}
else
{
if (CharIndex == 0)
{
return('\0');
}
//move back 1 char and do delete
Run removingTextRun = CurrentTextRun;
int removeIndex = CurrentTextRunCharIndex;
SetCurrentCharStepLeft();
char toBeRemovedChar = CurrentChar;
Run.InnerRemove(removingTextRun, removeIndex, 1, false);
if (removingTextRun.CharacterCount == 0)
{
Run nextRun = removingTextRun.NextRun;
CurrentLine.Remove(removingTextRun);
SetCurrentTextRun(nextRun);
EnsureCurrentTextRun();
}
CurrentLine.TextLineReCalculateActualLineSize();
CurrentLine.RefreshInlineArrange();
return(toBeRemovedChar);
}
}
public void SplitToNewLine()
{
Run currentRun = CurrentTextRun;
if (CurrentLine.IsBlankLine)
{
CurrentLine.AddLineBreakAfterLastRun();
}
else
{
if (CharIndex == -1)
{
CurrentLine.AddLineBreakBeforeFirstRun();
SetCurrentTextRun(null);
}
else
{
CopyRun rightSplitedPart = Run.InnerRemove(currentRun,
CurrentTextRunCharIndex + 1, true);
if (rightSplitedPart != null)
{
CurrentLine.AddAfter(currentRun, rightSplitedPart);
}
CurrentLine.AddLineBreakAfter(currentRun);
if (currentRun.CharacterCount == 0)
{
CurrentLine.Remove(currentRun);
}
}
}
this.TextLayer.TopDownReCalculateContentSize();
EnsureCurrentTextRun();
}
internal void Remove(VisualSelectionRange selectionRange)
{
EditableVisualPointInfo startPoint = selectionRange.StartPoint;
EditableVisualPointInfo endPoint = selectionRange.EndPoint;
if (startPoint.Run != null)
{
if (startPoint.Run == endPoint.Run)
{
Run removedRun = startPoint.Run;
Run.InnerRemove(removedRun,
startPoint.RunLocalSelectedIndex,
endPoint.LineCharIndex - startPoint.LineCharIndex, false);
if (removedRun.CharacterCount == 0)
{
if (startPoint.LineId == _currentLineNumber)
{
this.Remove(removedRun);
}
else
{
TextLineBox line = _textFlowLayer.GetTextLine(startPoint.LineId);
line.Remove(removedRun);
}
}
}
else
{
GetStartAndStopLine(startPoint, endPoint, out TextLineBox startLine, out TextLineBox stopLine);
EditableVisualPointInfo newStartPoint = startLine.Split(startPoint);
EditableVisualPointInfo newStopPoint = stopLine.Split(endPoint);
if (startLine == stopLine)
{
if (newStartPoint.Run != null)
{
LinkedList <Run> tobeRemoveRuns = new LinkedList <Run>();
if (newStartPoint.LineCharIndex == 0)
{
foreach (Run t in _textFlowLayer.TextRunForward(
newStartPoint.Run,
newStopPoint.Run))
{
tobeRemoveRuns.AddLast(t);
}
}
else
{
foreach (Run t in _textFlowLayer.TextRunForward(
newStartPoint.Run.NextRun,
newStopPoint.Run))
{
tobeRemoveRuns.AddLast(t);
}
}
startLine.LocalSuspendLineReArrange();
foreach (Run t in tobeRemoveRuns)
{
startLine.Remove(t);
}
startLine.LocalResumeLineReArrange();
}
else
{
//this may be the blank line
startLine.Clear();
#if DEBUG
//TODO: review here again
//System.Diagnostics.Debug.WriteLine("EditableTextLine_adv1");
#endif
}
}
else
{
int startLineId = newStartPoint.LineId;
int stopLineId = newStopPoint.LineId;
if (newStopPoint.LineCharIndex > 0)
{
stopLine.RemoveLeft(newStopPoint.Run);
}
for (int i = stopLineId - 1; i > startLineId; i--)
{
TextLineBox line = _textFlowLayer.GetTextLine(i);
line.Clear();
line.JoinWithNextLine();
}
if (newStartPoint.LineCharIndex == 0)
{
startLine.RemoveRight(newStartPoint.Run);
}
else
{
Run nextRun = (newStartPoint.Run).NextRun;
if (nextRun != null)
{
startLine.RemoveRight(nextRun);
}
}
startLine.JoinWithNextLine();
}
}
}
else
{
GetStartAndStopLine(startPoint, endPoint, out TextLineBox startLine, out TextLineBox stopLine);
EditableVisualPointInfo newStartPoint = startLine.Split(startPoint);
EditableVisualPointInfo newStopPoint = stopLine.Split(endPoint);
if (startLine == stopLine)
{
if (newStartPoint.Run != null)
{
LinkedList <Run> tobeRemoveRuns = new LinkedList <Run>();
if (newStartPoint.LineCharIndex == -1)
{
foreach (Run t in _textFlowLayer.TextRunForward(
newStartPoint.Run,
newStopPoint.Run))
{
tobeRemoveRuns.AddLast(t);
}
}
else
{
foreach (Run t in _textFlowLayer.TextRunForward(
newStartPoint.Run.NextRun,
newStopPoint.Run))
{
tobeRemoveRuns.AddLast(t);
}
}
foreach (Run t in tobeRemoveRuns)
{
startLine.Remove(t);
}
}
else
{
throw new NotSupportedException();
}
}
else
{
int startLineId = newStartPoint.LineId;
int stopLineId = newStopPoint.LineId;
if (newStopPoint.LineCharIndex > -1)
{
stopLine.RemoveLeft(newStopPoint.Run);
}
for (int i = stopLineId - 1; i > startLineId; i--)
{
TextLineBox line = _textFlowLayer.GetTextLine(i);
line.Clear();
line.JoinWithNextLine();
}
if (newStartPoint.LineCharIndex == -1)
{
//TODO: review here again
//at this point newStartPoint.TextRun should always null
if (newStartPoint.Run != null)
{
startLine.RemoveRight(newStartPoint.Run);
}
}
else
{
//at this point newStartPoint.TextRun should always null
//TODO newStartPoint.TextRun == null???
if (newStartPoint.Run != null)
{
Run nextRun = newStartPoint.Run.NextRun;
if (nextRun != null)
{
startLine.RemoveRight(nextRun);
}
}
}
startLine.JoinWithNextLine();
}
}
}