internal void UpdateText()
{
if (Text == null)
{
return;
}
CanvasRoot.Height = Text.LineCount * LineHeight;
CanvasRoot.Invalidate();
GutterRoot.Text = this.Text;
GutterRoot.UpdateHeight(CanvasRoot.Height);
if (DiffMap != null)
{
DiffMap.UpdateTextViews();
}
Text.ScrollToLineRequested -= Text_ScrollToLineRequested;
Text.ScrollToLineRequested += Text_ScrollToLineRequested;
}
private void canvas_RegionsInvalidated(CanvasVirtualControl sender, CanvasRegionsInvalidatedEventArgs args)
{
if (Text == null)
{
return;
}
// Update the diff map
if (_parentScrollViewer == null)
{
_parentScrollViewer = VisualTreeHelper.FindParent <ScrollViewer>(this);
if (_parentScrollViewer != null)
{
_parentScrollViewer.ViewChanged += (s, e) =>
{
if (DiffMap != null)
{
DiffMap.UpdateTextViews();
}
};
// Force update once
if (DiffMap != null)
{
DiffMap.UpdateTextViews();
}
}
}
if (_language == null && !string.IsNullOrEmpty(FileExtension))
{
_language = Languages.FindById(FileExtension);
}
foreach (Windows.Foundation.Rect region in args.InvalidatedRegions)
{
using (CanvasDrawingSession ds = sender.CreateDrawingSession(region))
{
ds.Clear(_defaultBackgroundColor);
int startLine = (int)Math.Clamp(Math.Floor(region.Top / LineHeight), 0, Text.LineCount);
// add 2 to the end line count. we want to "overdraw" a bit if the line is going to be cut-off
int endLine = (int)Math.Clamp(Math.Ceiling(region.Bottom / LineHeight) + 2, 0, Text.LineCount);
StringBuilder stringRegion = new StringBuilder();
for (int i = startLine; i < endLine; i++)
{
ITextLine line = Text.GetLine(i);
if (line is DiffTextLine diffLine)
{
if (diffLine.ChangeType == DiffLineType.Empty)
{
stringRegion.AppendLine(); // null line
}
else
{
stringRegion.AppendLine(Text.GetLine(i).ToString());
}
}
}
using (var canvasText = new CanvasTextLayout(ds, stringRegion.ToString(), _textFormat, 9999, (float)region.Height))
{
// Handle the diff line background colors
int index = 0;
for (int i = startLine; i < endLine; i++)
{
var line = Text.GetLine(i);
if (line is DiffTextLine diffLine)
{
switch (diffLine.ChangeType)
{
case DiffLineType.Insert:
{
ds.FillRectangle(0, i * LineHeight, (float)this.ActualWidth, MathF.Ceiling(LineHeight), _addedBackgroundColor);
if (_language == null)
{
canvasText.SetBrush(index, line.Length, _addedForegroundBrush);
}
}
break;
case DiffLineType.Remove:
{
ds.FillRectangle(0, i * LineHeight, (float)this.ActualWidth, MathF.Ceiling(LineHeight), _removedBackgroundColor);
if (_language == null)
{
canvasText.SetBrush(index, line.Length, _removedForegroundBrush);
}
}
break;
case DiffLineType.Empty:
{
ds.FillRectangle(0, i * LineHeight, (float)this.ActualWidth, MathF.Ceiling(LineHeight), _nullBrush);
}
break;
case DiffLineType.Unchanged:
default:
break;
}
}
index += line.Length + 2; // add for newline
}
// Syntax highlight
if (_language != null)
{
_colorizer.FormatLine(_language, CanvasRoot, canvasText, stringRegion.ToString());
}
// Draw the text
ds.DrawTextLayout(canvasText, 0, startLine * LineHeight, _defaultForegroundBrush);
}
}
}
}
