/// <summary>
/// Applies a highlighting color to a visual line element.
/// </summary>
protected virtual void ApplyColorToElement(VisualLineElement element, HighlightingColor color)
{
if (color.Foreground != null) {
Brush b = color.Foreground.GetBrush(CurrentContext);
if (b != null)
element.TextRunProperties.SetForegroundBrush(b);
}
if (color.Background != null) {
Brush b = color.Background.GetBrush(CurrentContext);
if (b != null)
element.BackgroundBrush = b;
}
if (color.FontStyle != null || color.FontWeight != null) {
Typeface tf = element.TextRunProperties.Typeface;
element.TextRunProperties.SetTypeface(new Typeface(
tf.FontFamily,
color.FontStyle ?? tf.Style,
color.FontWeight ?? tf.Weight,
tf.Stretch
));
}
}
/// <summary>
/// Helper method for splitting this line element into two, correctly updating the
/// <see cref="VisualLength"/>, <see cref="DocumentLength"/>, <see cref="VisualColumn"/>
/// and <see cref="RelativeTextOffset"/> properties.
/// </summary>
/// <param name="firstPart">The element before the split position.</param>
/// <param name="secondPart">The element after the split position.</param>
/// <param name="splitVisualColumn">The split position as visual column.</param>
/// <param name="splitRelativeTextOffset">The split position as text offset.</param>
protected void SplitHelper(VisualLineElement firstPart, VisualLineElement secondPart, int splitVisualColumn, int splitRelativeTextOffset)
{
if (firstPart == null)
throw new ArgumentNullException("firstPart");
if (secondPart == null)
throw new ArgumentNullException("secondPart");
int relativeSplitVisualColumn = splitVisualColumn - VisualColumn;
int relativeSplitRelativeTextOffset = splitRelativeTextOffset - RelativeTextOffset;
if (relativeSplitVisualColumn <= 0 || relativeSplitVisualColumn >= VisualLength)
throw new ArgumentOutOfRangeException("splitVisualColumn", splitVisualColumn, "Value must be between " + (VisualColumn + 1) + " and " + (VisualColumn + VisualLength - 1));
if (relativeSplitRelativeTextOffset < 0 || relativeSplitRelativeTextOffset > DocumentLength)
throw new ArgumentOutOfRangeException("splitRelativeTextOffset", splitRelativeTextOffset, "Value must be between " + (RelativeTextOffset) + " and " + (RelativeTextOffset + DocumentLength));
int oldVisualLength = VisualLength;
int oldDocumentLength = DocumentLength;
int oldVisualColumn = VisualColumn;
int oldRelativeTextOffset = RelativeTextOffset;
firstPart.VisualColumn = oldVisualColumn;
secondPart.VisualColumn = oldVisualColumn + relativeSplitVisualColumn;
firstPart.RelativeTextOffset = oldRelativeTextOffset;
secondPart.RelativeTextOffset = oldRelativeTextOffset + relativeSplitRelativeTextOffset;
firstPart.VisualLength = relativeSplitVisualColumn;
secondPart.VisualLength = oldVisualLength - relativeSplitVisualColumn;
firstPart.DocumentLength = relativeSplitRelativeTextOffset;
secondPart.DocumentLength = oldDocumentLength - relativeSplitRelativeTextOffset;
if (firstPart.TextRunProperties == null)
firstPart.TextRunProperties = TextRunProperties.Clone();
if (secondPart.TextRunProperties == null)
secondPart.TextRunProperties = TextRunProperties.Clone();
}
