internal static void UpdateTrackVisuals(
PtsContext ptsContext,
VisualCollection visualCollection,
PTS.FSKUPDATE fskupdInherited,
ref PTS.FSTRACKDESCRIPTION trackDesc)
{
PTS.FSKUPDATE fskupd = trackDesc.fsupdinf.fskupd;
if (trackDesc.fsupdinf.fskupd == PTS.FSKUPDATE.fskupdInherited)
{
fskupd = fskupdInherited;
}
// If there is no change, visual information is valid
if (fskupd == PTS.FSKUPDATE.fskupdNoChange) { return; }
ErrorHandler.Assert(fskupd != PTS.FSKUPDATE.fskupdShifted, ErrorHandler.UpdateShiftedNotValid);
bool emptyTrack = (trackDesc.pfstrack == IntPtr.Zero);
if (!emptyTrack)
{
// Get track details
PTS.FSTRACKDETAILS trackDetails;
PTS.Validate(PTS.FsQueryTrackDetails(ptsContext.Context, trackDesc.pfstrack, out trackDetails));
emptyTrack = (trackDetails.cParas == 0);
if (!emptyTrack)
{
// Get list of paragraphs
PTS.FSPARADESCRIPTION[] arrayParaDesc;
ParaListFromTrack(ptsContext, trackDesc.pfstrack, ref trackDetails, out arrayParaDesc);
// Update visuals for list of paragraphs
UpdateParaListVisuals(ptsContext, visualCollection, fskupd, arrayParaDesc);
}
}
// There is possibility to get empty track. (example: large figures)
if (emptyTrack)
{
// There is no content, remove all existing children visuals.
visualCollection.Clear();
}
}
private void SyncUpdateDeferredLineVisuals(VisualCollection lineVisuals, ref PTS.FSTEXTDETAILSFULL textDetails, bool ignoreUpdateInfo)
{
Debug.Assert(!PTS.ToBoolean(textDetails.fLinesComposite));
try
{
if (!PTS.ToBoolean(textDetails.fUpdateInfoForLinesPresent) || ignoreUpdateInfo)
{
// _lineIndexFirstVisual will be updated based on the size of this list, so clearing is sufficient here.
lineVisuals.Clear();
}
else if (_lineIndexFirstVisual != -1)
{
PTS.FSLINEDESCRIPTIONSINGLE[] arrayLineDesc;
PtsHelper.LineListSimpleFromTextPara(PtsContext, _paraHandle.Value, ref textDetails, out arrayLineDesc);
int lineIndexToBeginRemoval = textDetails.cLinesBeforeChange;
int cLinesToRemove = textDetails.cLinesChanged - textDetails.dcLinesChanged;
int insertionIndex = -1;
// Shift lines before change
if(textDetails.dvrShiftBeforeChange != 0)
{
int countVisualsShiftBeforeChange = Math.Min(Math.Max(lineIndexToBeginRemoval - _lineIndexFirstVisual, 0), lineVisuals.Count);
for(int index = 0; index < countVisualsShiftBeforeChange; index++)
{
// Shift line's visual
ContainerVisual lineVisual = (ContainerVisual) lineVisuals[index];
Vector offset = lineVisual.Offset;
offset.Y += TextDpi.FromTextDpi(textDetails.dvrShiftBeforeChange);
lineVisual.Offset = offset;
}
}
// If the line index to begin removal is before our first visual, then the overlap will look like
// |---------------| (Committed visual range)
// |------| (Range to remove)
if (lineIndexToBeginRemoval < _lineIndexFirstVisual)
{
// Determine the amount of overlap, and remove.
int actualLinesToRemove = Math.Min(Math.Max(lineIndexToBeginRemoval - _lineIndexFirstVisual + cLinesToRemove, 0), lineVisuals.Count);
if (actualLinesToRemove > 0)
{
lineVisuals.RemoveRange(0, actualLinesToRemove);
}
if (lineVisuals.Count == 0)
{
lineVisuals.Clear();
_lineIndexFirstVisual = -1;
}
else
{
insertionIndex = 0;
_lineIndexFirstVisual = lineIndexToBeginRemoval;
}
}
else if (lineIndexToBeginRemoval < _lineIndexFirstVisual + lineVisuals.Count)
{
// Else case for overlap
// |---------------| (Committed visual range)
// |-----| (Range to remove)
// Or
// |---------------|
// |--------------|
// Removing from the middle
int actualLinesToRemove = Math.Min(cLinesToRemove, lineVisuals.Count - (lineIndexToBeginRemoval - _lineIndexFirstVisual));
lineVisuals.RemoveRange(lineIndexToBeginRemoval - _lineIndexFirstVisual, actualLinesToRemove);
insertionIndex = lineIndexToBeginRemoval - _lineIndexFirstVisual; // Insertion index is relative to committed visual range
}
int shiftIndex = -1;
if (insertionIndex != -1)
{
// Add new lines
// Insertion must occur at some point along our committed visual range
Debug.Assert(insertionIndex >= 0 && insertionIndex <= lineVisuals.Count);
for (int index = textDetails.cLinesBeforeChange; index < textDetails.cLinesBeforeChange + textDetails.cLinesChanged; index++)
{
PTS.FSLINEDESCRIPTIONSINGLE lineDesc = arrayLineDesc[index];
ContainerVisual lineVisual = CreateLineVisual(ref arrayLineDesc[index], Paragraph.ParagraphStartCharacterPosition);
lineVisuals.Insert(insertionIndex + (index - textDetails.cLinesBeforeChange), lineVisual);
lineVisual.Offset = new Vector(TextDpi.FromTextDpi(lineDesc.urStart), TextDpi.FromTextDpi(lineDesc.vrStart));
}
shiftIndex = insertionIndex + textDetails.cLinesChanged;
}
// Any committed visuals after our inserted section must be shifted
if (shiftIndex != -1)
{
// Shift remaining lines
for (int index = shiftIndex; index < lineVisuals.Count; index++)
{
// Shift line's visual
ContainerVisual lineVisual = (ContainerVisual) lineVisuals[index];
Vector offset = lineVisual.Offset;
offset.Y += TextDpi.FromTextDpi(textDetails.dvrShiftAfterChange);
lineVisual.Offset = offset;
}
}
}
}
finally
{
// If no visuals, committed range is nonexistant, so -1
if (lineVisuals.Count == 0)
{
_lineIndexFirstVisual = -1;
}
}
#if VERIFY_VISUALS
// Verify our visuals are in-[....] with the actual line visuals.
VerifyVisuals(ref textDetails);
#endif
}