private void UpdateOutlineChanges(ICanvasResourceCreator canvas,
ITextModel leftControl, ITextModel rightControl, double controlHeight)
{
if (leftControl == null || rightControl == null)
{
return;
}
int lineCountOrg = leftControl.ValidLineCount;
int lineCountCur = rightControl.ValidLineCount;
int maxLineCount = Math.Max(lineCountOrg, lineCountCur);
int singleOrgLineHeight = (int)(controlHeight / lineCountOrg);
int singleCurLineHeight = (int)(controlHeight / lineCountCur);
var removedGeo = new List <CanvasGeometry>();
var addedGeo = new List <CanvasGeometry>();
// Draw removals
int lineNo = 0;
for (int i = 0; i < leftControl.LineCount; i++)
{
var textLine = leftControl.GetLine(i);
if (textLine is DiffTextLine diffLine)
{
if (diffLine.ChangeType != DiffLineType.Empty)
{
lineNo++;
}
if (diffLine.ChangeType == DiffLineType.Remove)
{
int ypos = (int)((double)lineNo / maxLineCount * controlHeight);
removedGeo.Add(CanvasGeometry.CreateRectangle(canvas,
new Rect(12.0, ypos + (int)_leftFileTop, 16.0, singleOrgLineHeight + 1)));
}
}
}
lineNo = 0;
for (int i = 0; i < rightControl.LineCount; i++)
{
var textLine = rightControl.GetLine(i);
if (textLine is DiffTextLine diffLine)
{
if (diffLine.ChangeType != DiffLineType.Empty)
{
lineNo++;
}
if (diffLine.ChangeType == DiffLineType.Insert)
{
int ypos = (int)((double)lineNo / maxLineCount * controlHeight);
addedGeo.Add(CanvasGeometry.CreateRectangle(canvas,
new Rect(40.0, ypos + (int)_rightFileTop, 16.0, singleCurLineHeight + 1)));
}
}
}
// Save the results into a cached geo
var groupedRemovedGeo = CanvasGeometry.CreateGroup(canvas, removedGeo.ToArray());
var groupedAddedGeo = CanvasGeometry.CreateGroup(canvas, addedGeo.ToArray());
_outlineChangesRemoved = CanvasCachedGeometry.CreateFill(groupedRemovedGeo);
_outlineChangesAdded = CanvasCachedGeometry.CreateFill(groupedAddedGeo);
}