/// <summary>
/// Renders the <see cref="AccessText"/> to a drawing context.
/// </summary>
/// <param name="context">The drawing context.</param>
public override void Render(DrawingContext context)
{
base.Render(context);
int underscore = Text?.IndexOf('_') ?? -1;
if (underscore != -1 && ShowAccessKey)
{
var rect = FormattedText.HitTestTextPosition(underscore);
var offset = new Vector(0, -0.5);
context.DrawLine(
new Pen(Foreground, 1),
rect.BottomLeft + offset,
rect.BottomRight + offset);
}
}
public override void Render(DrawingContext context)
{
var selectionStart = SelectionStart;
var selectionEnd = SelectionEnd;
if (selectionStart != selectionEnd)
{
var start = Math.Min(selectionStart, selectionEnd);
var length = Math.Max(selectionStart, selectionEnd) - start;
var rects = FormattedText.HitTestTextRange(start, length);
var brush = new SolidColorBrush(0xff086f9e);
foreach (var rect in rects)
{
context.FillRectangle(brush, rect);
}
}
base.Render(context);
if (selectionStart == selectionEnd)
{
var charPos = FormattedText.HitTestTextPosition(CaretIndex);
var backgroundColor = (((Control)TemplatedParent).GetValue(BackgroundProperty) as SolidColorBrush)?.Color;
var caretBrush = Brushes.Black;
if(backgroundColor.HasValue)
{
byte red = (byte)~(backgroundColor.Value.R);
byte green = (byte)~(backgroundColor.Value.G);
byte blue = (byte)~(backgroundColor.Value.B);
caretBrush = new SolidColorBrush(Color.FromRgb(red, green, blue));
}
if (_caretBlink)
{
var x = Math.Floor(charPos.X) + 0.5;
var y = Math.Floor(charPos.Y) + 0.5;
var b = Math.Ceiling(charPos.Bottom) - 0.5;
context.DrawLine(
new Pen(caretBrush, 1),
new Point(x, y),
new Point(x, b));
}
}
}
/// <summary>
///
/// </summary>
/// <param name="dc"></param>
/// <param name="pen"></param>
/// <param name="isStroked"></param>
/// <param name="p0"></param>
/// <param name="p1"></param>
private static void DrawLineInternal(
DrawingContext dc,
Pen pen,
bool isStroked,
ref Point p0,
ref Point p1)
{
if (isStroked)
{
dc.DrawLine(pen, p0, p1);
}
}