LineTransform ILineTransformSource.GetLineTransform(ITextViewLine line, double yPosition, ViewRelativePosition placement)
{
#pragma warning disable 219
bool imageOnLine = false; // useful for tracing
#pragma warning restore 219
int lineNumber = line.Snapshot.GetLineFromPosition(line.Start.Position).LineNumber;
LineTransform lineTransform;
// Look up Image for current line and increase line height as necessary
if (_manager.Images.ContainsKey(lineNumber) && ImageAdornmentManager.Enabled)
{
double defaultHeight = line.DefaultLineTransform.BottomSpace;
CommentImage image = _manager.Images[lineNumber];
lineTransform = new LineTransform(0, image.Height + defaultHeight, 1.0);
imageOnLine = true;
}
else
{
lineTransform = new LineTransform(0, 0, 1.0);
}
return(lineTransform);
}
/// <summary>
/// Scans text line for matching image comment signature, then adds new or updates existing image adornment
/// </summary>
private void CreateVisuals(ITextViewLine line, int lineNumber, string absFilename)
{
ThreadHelper.ThrowIfNotOnUIThread();
var directory = absFilename != null?System.IO.Path.GetDirectoryName(absFilename) : null;
var lineText = line.Extent.GetText().Split(new[] { "\r\n", "\r" }, StringSplitOptions.None)[0];
var matchIndex = ImageCommentParser.Match(_contentTypeName, lineText, out var matchedText);
if (matchIndex >= 0)
{
//lineText = line.Extent.GetText().Split(new string[] { "\r\n", "\r" }, StringSplitOptions.None)[0];
// Get coordinates of text
var start = line.Extent.Start.Position + matchIndex;
var end = line.Start + (line.Extent.Length - 1);
var span = new SnapshotSpan(_view.TextSnapshot, Span.FromBounds(start, end));
ImageCommentParser.TryParse(matchedText, out var parsedImgData, out var parsingError);
if (parsingError != null)
{
if (Images.ContainsKey(lineNumber))
{
_layer.RemoveAdornment(Images[lineNumber]);
Images.Remove(lineNumber);
}
_errorTags.Add(new TagSpan <ErrorTag>(span,
new ErrorTag("XML parse error", $"Problem with comment format: {parsingError}")));
return;
}
string loadingMessage = null;
// Check for and update existing image
CommentImage image = Images.ContainsKey(lineNumber) ? Images[lineNumber] : null;
if (image != null)
{
if (!image.Attributes.IsEqual(parsedImgData))
{
image.TrySet(directory, parsedImgData, out loadingMessage, () => CreateVisuals(line, lineNumber, absFilename));
}
}
else // No existing image, so create new one
{
image = new CommentImage(_variableExpander);
image.TrySet(directory, parsedImgData, out loadingMessage, () => CreateVisuals(line, lineNumber, absFilename));
Images.Add(lineNumber, image);
}
// Position image and add as adornment
if (loadingMessage == null && image.Source != null)
{
var geometry = _view.TextViewLines.GetMarkerGeometry(span);
if (geometry == null) // Exceptional case when image dimensions are massive (e.g. specifying very large scale factor)
{
throw new InvalidOperationException("Couldn't get source code line geometry. Is the loaded image massive?");
}
var textLeft = geometry.Bounds.Left;
var textBottom = line.TextBottom;
Canvas.SetLeft(image, textLeft);
Canvas.SetTop(image, textBottom);
// Add image to editor view
try
{
_layer.RemoveAdornment(image);
_layer.AddAdornment(AdornmentPositioningBehavior.TextRelative, line.Extent, null, image, null);
}
catch (Exception ex)
{
// No expected exceptions, so tell user something is wrong.
ExceptionHandler.Notify(ex, true);
}
}
else
{
if (Images.ContainsKey(lineNumber))
{
Images.Remove(lineNumber);
}
_errorTags.Add(new TagSpan <ErrorTag>(span, loadingMessage == null ?
new ErrorTag("No image set", "No image set") :
new ErrorTag("Trouble loading image", loadingMessage)));
}
}
else
{
if (Images.ContainsKey(lineNumber))
{
Images.Remove(lineNumber);
}
}
}
