private void ShowDownloadedImage(ITextViewLine line, SnapshotSpan span, Color bgColor, MyImage image)
{
if (bgColor.A != 0 && image.BgColor != bgColor)
{
image.Scale = 1;
image.Source = image.ReplaceTransparency(image.Source, bgColor);
image.BgColor = bgColor;
}
Geometry g = _view.TextViewLines.GetMarkerGeometry(span);
if (g == 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?");
}
double textLeft = g.Bounds.Left;
double 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);
}
}
/// <summary>
/// On layout change add the adornment to any reformatted lines
/// </summary>
private void LayoutChangedHandler(object sender, TextViewLayoutChangedEventArgs e)
{
ThreadHelper.ThrowIfNotOnUIThread();
if (!Enabled)
{
return;
}
_errorTags.Clear();
if (TagsChanged != null)
{
TagsChanged(this, new SnapshotSpanEventArgs(new SnapshotSpan(_view.TextSnapshot, new Span(0, _view.TextSnapshot.Length))));
}
OnTagsChanged(new SnapshotSpan(_view.TextSnapshot, new Span(0, _view.TextSnapshot.Length)));
foreach (ITextViewLine line in _view.TextViewLines) // TODO [?]: implement more sensible handling of removing error tags, then use e.NewOrReformattedLines
{
int lineNumber = line.Snapshot.GetLineFromPosition(line.Start.Position).LineNumber;
//TODO [?]: Limit rate of calls to the below when user is editing a line
try
{
CreateVisuals(line, lineNumber);
}
catch (InvalidOperationException ex)
{
ExceptionHandler.Notify(ex, true);
}
}
// Sometimes, on loading a file in an editor view, the line transform gets triggered before the image adornments
// have been added, so the lines don't resize to the image height. So here's a workaround:
// Changing the zoom level triggers the required update.
// Need to do it twice - once to trigger the event, and again to change it back to the user's expected level.
if (!_initialised1)
{
_view.ZoomLevel++;
_initialised1 = true;
}
if (!_initialised2)
{
_view.ZoomLevel--;
_initialised2 = true;
}
}
/// <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);
}
}
}
/// <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)
{
#pragma warning disable 219
bool imageDetected = false; // useful for tracing
#pragma warning restore 219
string lineText = line.Extent.GetText();
string matchedText;
int matchIndex = ImageCommentParser.Match(_contentTypeName, lineText, out matchedText);
if (matchIndex >= 0)
{
// Get coordinates of text
int start = line.Extent.Start.Position + matchIndex;
int end = line.Start + (line.Extent.Length - 1);
var span = new SnapshotSpan(_view.TextSnapshot, Span.FromBounds(start, end));
Exception xmlParseException;
string imageUrl;
double scale;
Color bgColor = new Color();
ImageCommentParser.TryParse(matchedText, out imageUrl, out scale, ref bgColor, out xmlParseException);
if (xmlParseException != null)
{
if (Images.ContainsKey(lineNumber))
{
_layer.RemoveAdornment(Images[lineNumber]);
Images.Remove(lineNumber);
}
_errorTags.Add(new TagSpan <ErrorTag>(span, new ErrorTag("XML parse error", GetErrorMessage(xmlParseException))));
return;
}
MyImage image;
Exception imageLoadingException = null;
// Check for and update existing image
MyImage existingImage = Images.ContainsKey(lineNumber) ? Images[lineNumber] : null;
if (existingImage != null)
{
image = existingImage;
if (existingImage.Url != imageUrl || existingImage.BgColor != bgColor) // URL different, so set new source
{
existingImage.TrySet(imageUrl, scale, bgColor, out imageLoadingException, () => CreateVisuals(line, lineNumber));
}
else if (existingImage.Url == imageUrl && Math.Abs(existingImage.Scale - scale) > 0.0001) // URL same but scale changed
{
existingImage.Scale = scale;
}
}
else // No existing image, so create new one
{
image = new MyImage(_variableExpander);
image.TrySet(imageUrl, scale, bgColor, out imageLoadingException, () => CreateVisuals(line, lineNumber));
Images.Add(lineNumber, image);
}
// Position image and add as adornment
if (imageLoadingException == null)
{
Geometry g = _view.TextViewLines.GetMarkerGeometry(span);
if (g == 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?");
}
double textLeft = g.Bounds.Left;
double 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, new ErrorTag("Trouble loading image", GetErrorMessage(imageLoadingException))));
}
imageDetected = true;
}
else
{
if (Images.ContainsKey(lineNumber))
{
Images.Remove(lineNumber);
}
}
}
/// <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)
{
#pragma warning disable 219
bool imageDetected = false; // useful for tracing
#pragma warning restore 219
string lineText = line.Extent.GetText();
string matchedText;
int matchIndex = ImageCommentParser.Match(_contentTypeName, lineText, out matchedText);
if (matchIndex >= 0)
{
// Get coordinates of text
int start = line.Extent.Start.Position + matchIndex;
int end = line.Start + (line.Extent.Length - 1);
var span = new SnapshotSpan(_view.TextSnapshot, Span.FromBounds(start, end));
Exception xmlParseException;
string imageUrl;
double scale;
Color bgColor = new Color();
ImageCommentParser.TryParse(matchedText, out imageUrl, out scale, ref bgColor, out xmlParseException);
if (xmlParseException != null)
{
if (Images.ContainsKey(lineNumber))
{
_layer.RemoveAdornment(Images[lineNumber]);
Images.Remove(lineNumber);
}
_errorTags.Add(new TagSpan <ErrorTag>(span, new ErrorTag("XML parse error", GetErrorMessage(xmlParseException))));
return;
}
MyImage image;
Exception imageLoadingException = null;
// Check for and update existing image
MyImage existingImage = Images.ContainsKey(lineNumber) ? Images[lineNumber] : null;
if (existingImage != null)
{
image = existingImage;
if (existingImage.Url != imageUrl) // URL different, so set new source
{
existingImage.TrySet(imageUrl, scale, bgColor, out imageLoadingException, () => CreateVisuals(line, lineNumber));
if (image.BgColor != null)
{
image.BgColor.R = 254;
}
}
}
else // No existing image, so create new one
{
image = new MyImage(_variableExpander);
image.TrySet(imageUrl, scale, bgColor, out imageLoadingException, () => CreateVisuals(line, lineNumber));
if (image.BgColor != null)
{
image.BgColor.R = 254;
}
Images.Add(lineNumber, image);
}
// Position image and add as adornment
if (imageLoadingException == null)
{
try
{
_layer.RemoveAdornment(image);
}
catch (Exception ex)
{
// No expected exceptions, so tell user something is wrong.
ExceptionHandler.Notify(ex, true);
}
if ((image.Source as BitmapFrame)?.IsDownloading ?? false)
{
(image.Source as BitmapFrame).DownloadCompleted += (x, y) =>
{
if (x == image.Source)
{
ShowDownloadedImage(line, span, bgColor, image);
}
};
}
else
{
ShowDownloadedImage(line, span, bgColor, image);
}
}
else
{
if (Images.ContainsKey(lineNumber))
{
Images.Remove(lineNumber);
}
_errorTags.Add(new TagSpan <ErrorTag>(span, new ErrorTag("Trouble loading image", GetErrorMessage(imageLoadingException))));
}
imageDetected = true;
}
else
{
if (Images.ContainsKey(lineNumber))
{
Images.Remove(lineNumber);
}
}
}
