/// <summary>
/// 实现了Strikethrough类型的文本装饰.
/// </summary>
/// <param name="text">待装饰的文本</param>
/// <param name="p">待装饰的区域</param>
/// <returns></returns>
private Geometry StrikethroughGeometryMaker(FormattedText text, Pair p)
{
Geometry geom = text.BuildHighlightGeometry(new Point(0, 0), p.Start, p.Length);
if (geom != null)
{
StackedRectangleGeometryHelper srgh = new StackedRectangleGeometryHelper(geom);
return(srgh.CenterLineRectangleGeometry());
}
else
{
return(null);
}
}
/// <summary>
/// 实现了Underline类型的文本装饰
/// </summary>
/// <param name="text">待装饰的文本</param>
/// <param name="p">待装饰的区域</param>
/// <returns></returns>
private Geometry UnderlineGeometryMaker(FormattedText text, Pair p)
{
Geometry geom = text.BuildHighlightGeometry(new Point(0, 0), p.Start, p.Length);
if (geom != null)
{
StackedRectangleGeometryHelper srgh = new StackedRectangleGeometryHelper(geom);
return(srgh.BottomEdgeRectangleGeometry());
}
else
{
return(null);
}
}
protected override void OnRender(System.Windows.Media.DrawingContext drawingContext)
{
//base.OnRender(drawingContext);
if (this.Text != "")
{
FormattedText formattedText = null;
double leftMargin = 4.0 + this.BorderThickness.Left;
double topMargin = 2 + this.BorderThickness.Top;
if (IsAllowFormatSqlContent)
{
#region MyRendering
EnsureScrolling();
formattedText = new FormattedText(
this.Text,
CultureInfo.GetCultureInfo("en-us"),
FlowDirection.LeftToRight,
new Typeface(this.FontFamily.Source),
this.FontSize,
BaseForeground); //Text that matches the textbox's
formattedText.MaxTextWidth = this.ViewportWidth; // space for scrollbar
formattedText.MaxTextHeight = Math.Max(this.ActualHeight + this.VerticalOffset, 0); //Adjust for scrolling
drawingContext.PushClip(new RectangleGeometry(new Rect(0, 0, this.ActualWidth, this.ActualHeight))); //restrict text to textbox
//Background hilight
foreach (Decoration dec in mDecorations)
{
if (dec.DecorationType == EDecorationType.Hilight)
{
List <Pair> ranges = dec.Ranges(this.Text);
foreach (Pair p in ranges)
{
Geometry geom = formattedText.BuildHighlightGeometry(new Point(leftMargin, topMargin - this.VerticalOffset), p.Start, p.Length);
if (geom != null)
{
#if DEBUG
Debug.WriteLine("Draw geometry");
#endif
drawingContext.DrawGeometry(dec.Brush, null, geom);
}
}
}
}
//Underline
foreach (Decoration dec in mDecorations)
{
if (dec.DecorationType == EDecorationType.Underline)
{
List <Pair> ranges = dec.Ranges(this.Text);
foreach (Pair p in ranges)
{
Geometry geom = formattedText.BuildHighlightGeometry(new Point(leftMargin, topMargin - this.VerticalOffset), p.Start, p.Length);
if (geom != null)
{
StackedRectangleGeometryHelper srgh = new StackedRectangleGeometryHelper(geom);
foreach (Geometry g in srgh.BottomEdgeRectangleGeometries())
{
#if DEBUG
Debug.WriteLine("Draw geometry2");
#endif
drawingContext.DrawGeometry(dec.Brush, null, g);
}
}
}
}
}
//Strikethrough
foreach (Decoration dec in mDecorations)
{
if (dec.DecorationType == EDecorationType.Strikethrough)
{
List <Pair> ranges = dec.Ranges(this.Text);
foreach (Pair p in ranges)
{
Geometry geom = formattedText.BuildHighlightGeometry(new Point(leftMargin, topMargin - this.VerticalOffset), p.Start, p.Length);
if (geom != null)
{
StackedRectangleGeometryHelper srgh = new StackedRectangleGeometryHelper(geom);
foreach (Geometry g in srgh.CenterLineRectangleGeometries())
{
#if DEBUG
Debug.WriteLine("Draw geometry3");
#endif
drawingContext.DrawGeometry(dec.Brush, null, g);
}
}
}
}
}
#region TextColor
foreach (Decoration dec in mDecorations)
{
if (dec.DecorationType == EDecorationType.TextColor)
{
List <Pair> ranges = dec.Ranges(this.Text);
foreach (Pair p in ranges)
{
#if DEBUG
Debug.WriteLine("Set background brush" + p.Start.ToString());
#endif
//this method will paint the text ,it will cost many ,many times,
//if the sql script large enough (more than 100k)
//So I'd rather use simplest textbox with no formatted sql text replace this control.
formattedText.SetForegroundBrush(dec.Brush, p.Start, p.Length);
}
}
}
#endregion
#if DEBUG
Debug.WriteLine("End drawing");
#endif
#endregion
}
if (formattedText == null)
{
this.Foreground = new SolidColorBrush(Colors.Black);
}
drawingContext.DrawText(formattedText, new Point(leftMargin, topMargin - this.VerticalOffset));
}
}
