public bool AddAdornment(AdornmentPositioningBehavior behavior, SnapshotSpan?visualSpan, object tag, AdornmentElement element, AdornmentRemovedCallback removedCallback)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
if (_isOverlayLayer && behavior != AdornmentPositioningBehavior.OwnerControlled)
{
throw new ArgumentOutOfRangeException("behavior", "Only AdornmentPositioningBehavior.OwnerControlled is supported");
}
if (IsTextRelative(behavior) && !visualSpan.HasValue)
{
throw new ArgumentNullException("visualSpan");
}
bool visible = true;
if (visualSpan.HasValue)
{
//Does the visual span intersect anything visible?
visible = _view.TextViewLines.IntersectsBufferSpan(visualSpan.Value);
}
if (visible)
{
AdornmentAndData data = new AdornmentAndData(behavior, visualSpan, tag, element, removedCallback);
_elements.Add(data);
Children.Add(element);
}
return(visible);
}
//Remove the visual child and call the removed callback. Do not attempt to remove the data from the list of visuals.
private void RemoveTranslatableVisual(AdornmentAndData data)
{
Children.Remove(data.Adornment);
if (data.RemovedCallback != null)
{
data.RemovedCallback(data.Tag, data.Adornment);
}
}
public void RemoveAllAdornments()
{
for (int i = 0; (i < _elements.Count); ++i)
{
AdornmentAndData data = _elements[i];
this.RemoveTranslatableVisual(data);
}
_elements = new List <AdornmentAndData>();
}
public void RemoveAdornment(AdornmentElement element)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
for (int i = 0; (i < _elements.Count); ++i)
{
AdornmentAndData data = _elements[i];
if (data.Adornment == element)
{
_elements.RemoveAt(i);
this.RemoveTranslatableVisual(data);
break;
}
}
}
private void InternalRemoveMatchingAdornments(SnapshotSpan?visualSpan, Predicate <IAdornmentLayerElement> match)
{
List <AdornmentAndData> newVisuals = new List <AdornmentAndData>(_elements.Count);
for (int i = 0; (i < _elements.Count); ++i)
{
AdornmentAndData data = _elements[i];
if ((!visualSpan.HasValue || data.OverlapsWith(visualSpan.Value)) && match(data))
{
this.RemoveTranslatableVisual(data);
}
else
{
newVisuals.Add(data);
}
}
_elements = newVisuals;
}
internal void SetSnapshotAndUpdate(ITextSnapshot snapshot, double deltaX, double deltaY,
IList <ITextViewLine> newOrReformattedLines, IList <ITextViewLine> translatedLines)
{
//Go through all the added visuals and invalidate or transform as appropriate.
List <AdornmentAndData> newVisuals = new List <AdornmentAndData>(_elements.Count);
for (int i = 0; (i < _elements.Count); ++i)
{
AdornmentAndData data = _elements[i];
if (!data.VisualSpan.HasValue)
{
newVisuals.Add(data);
if (data.Behavior == AdornmentPositioningBehavior.ViewportRelative)
{
data.Translate(deltaX, deltaY);
}
}
else
{
data.SetSnapshot(snapshot);
SnapshotSpan span = data.VisualSpan.Value;
if ((!_view.TextViewLines.IntersectsBufferSpan(span)) ||
(GetCrossingLine(newOrReformattedLines, span) != null))
{
//Either visual is no longer visible or it crosses a line
//that was reformatted.
this.RemoveTranslatableVisual(data);
}
else
{
newVisuals.Add(data);
switch (data.Behavior)
{
case AdornmentPositioningBehavior.TextRelative:
case (AdornmentPositioningBehavior)(AdornmentPositioningBehavior2.TextRelativeVerticalOnly):
{
ITextViewLine line = GetCrossingLine(translatedLines, span);
if (line != null)
{
data.Translate((data.Behavior == AdornmentPositioningBehavior.TextRelative)
? 0.0
: deltaX, line.DeltaY);
}
else if (data.Behavior == (AdornmentPositioningBehavior)(AdornmentPositioningBehavior2.TextRelativeVerticalOnly))
{
data.Translate(deltaX, 0.0);
}
break;
}
case AdornmentPositioningBehavior.ViewportRelative:
{
data.Translate(deltaX, deltaY);
break;
}
}
}
}
}
_elements = newVisuals;
}
