private bool IsCompositionRecordShifted(CompositionEventRecord record)
{
//
// _previousCompositionStartOffset is set in OnUpdateComposition IME callback.
// At this point it reflects the current offsets of the composition text.
//
if ((((0 <= record.StartOffsetBefore) && (0 <= _previousCompositionStartOffset))
&& (record.StartOffsetBefore < _previousCompositionStartOffset)) ||
record.IsShiftUpdate)
{
return true;
}
return false;
}
public void OnUpdateComposition(UnsafeNativeMethods.ITfCompositionView view, UnsafeNativeMethods.ITfRange rangeNew)
{
// If UiScope has a ToolTip and it is open, any keyboard/mouse activity should close the tooltip.
this.TextEditor.CloseToolTip();
Invariant.Assert(_isComposing);
Invariant.Assert(_previousCompositionStartOffset != -1);
ITextPointer oldStart;
ITextPointer oldEnd;
GetCompositionPositions(view, out oldStart, out oldEnd);
ITextPointer newStart = null;
ITextPointer newEnd = null;
bool compositionRangeShifted = false;
if (rangeNew != null)
{
TextPositionsFromITfRange(rangeNew, out newStart, out newEnd);
compositionRangeShifted = (newStart.Offset != oldStart.Offset || newEnd.Offset != oldEnd.Offset);
}
string compositionText = TextRangeBase.GetTextInternal(oldStart, oldEnd);
if (compositionRangeShifted)
{
// Add internal shift record to process it later when we raise events in RaiseCompositionEvents.
CompositionEventRecord record = new CompositionEventRecord(CompositionStage.UpdateComposition, _previousCompositionStartOffset, _previousCompositionEndOffset, compositionText, true);
this.CompositionEventList.Add(record);
_previousCompositionStartOffset = newStart.Offset;
_previousCompositionEndOffset = newEnd.Offset;
_lastCompositionText = null;
}
else
{
// Add the composition message into the composition message list.
// This composition message list will be handled all together after release the lock.
CompositionEventRecord record = new CompositionEventRecord(CompositionStage.UpdateComposition, _previousCompositionStartOffset, _previousCompositionEndOffset, compositionText);
CompositionEventRecord previousRecord = (this.CompositionEventList.Count == 0) ? null : this.CompositionEventList[this.CompositionEventList.Count - 1];
if (_lastCompositionText == null ||
String.CompareOrdinal(compositionText, _lastCompositionText) != 0)
{
// Add the new update event.
this.CompositionEventList.Add(record);
}
_previousCompositionStartOffset = oldStart.Offset;
_previousCompositionEndOffset = oldEnd.Offset;
_lastCompositionText = compositionText;
}
// Composition event is completed, so new composition undo unit will be opened.
BreakTypingSequence(oldEnd);
}
