public static GradientBrush Convert(System.Windows.Media.Color color)
{
var scrgb = color.ToScRGBColor();
var xyz = KnownColorSpaces.scRGB.ToXYZColor(scrgb);
var lab = KnownColorSpaces.Lab.FromXYZColor(xyz) as LabColor;
var l_base = lab.L;
var gradientStops = new GradientStopCollection();
var _lab = new LabColor(0xff, l_base * 1.07, lab.a, lab.b);
var _c = _lab.ToWindowsMediaColor();
gradientStops.Add(new GradientStop(_c, 0.5));
_lab = new LabColor(0xff, l_base * .93, lab.a, lab.b);
_c = _lab.ToWindowsMediaColor();
gradientStops.Add(new GradientStop(_c, 1));
var result = new LinearGradientBrush(gradientStops, 90);
result.Freeze();
return result;
}
/// <summary>
/// Returns new color based on existing color with modified lightness component.
/// </summary>
/// <param name="color"></param>
/// <param name="lightnessMultiplier">0.5 to reduce lightness by 50%, 1.5 to increase lightness by 50%</param>
/// <returns></returns>
public static System.Windows.Media.Color ChangeLighthness(this System.Windows.Media.Color color, double lightnessMultiplier)
{
var scRGB = color.ToScRGBColor();
var xyz = KnownColorSpaces.scRGB.ToXYZColor(scRGB);
var lab = (LabColor) KnownColorSpaces.Lab.FromXYZColor(xyz);
var newColor = new LabColor(lab.Alpha, lab.L * lightnessMultiplier, lab.a, lab.b);
return newColor.ToWindowsMediaColor();
}
static void RefreshForegruond(TextBlock tb)
{
var selectionHighlightBrush = GetSelectionHighlightBrush(tb) as SolidColorBrush;
var hoverHighlightBrush = GetHoverHighlightBrush(tb) as SolidColorBrush;
if (selectionHighlightBrush != null || hoverHighlightBrush != null)
{
var foreground_originalValue = GetForegroundOriginalValue(tb);
var foreground_modifiedValue = GetForegroundModifiedValue(tb);
var highlight_brush = selectionHighlightBrush;
if (highlight_brush == null)
highlight_brush = hoverHighlightBrush;
if (highlight_brush == null)
{
// todo: restore original foreground
SetSelectionHighlightBrush(tb, null);
SetHoverHighlightBrush(tb, null);
SetForegroundModifiedValue(tb, null);
SetForegroundOriginalValue(tb, null);
return;
}
var highlight_color = highlight_brush.Color;
var foreground_brush = tb.Foreground as SolidColorBrush;
if (foreground_originalValue != null)
{
foreground_brush = foreground_originalValue as SolidColorBrush;
}
if (foreground_brush == null)
{
// todo: cleanup
// todo: restore original foreground
return;
}
var foreground_color = foreground_brush.Color;
//foreground_color.ToContrastingLightnessColor();
var highlightScRGB = highlight_color.ToScRGBColor();
var foregroundScRGB = foreground_color.ToScRGBColor();
var highlightXYZ = KnownColorSpaces.scRGB.ToXYZColor(highlightScRGB);
var foregroundXYZ = KnownColorSpaces.scRGB.ToXYZColor(foregroundScRGB);
var highlightLab = (LabColor)KnownColorSpaces.Lab.FromXYZColor(highlightXYZ);
var foregroundLab = (LabColor)KnownColorSpaces.Lab.FromXYZColor(foregroundXYZ);
var newForegroundLab = (LabColor)null;
if (highlightLab.L > 50 && foregroundLab.L > 50)
{
newForegroundLab = new LabColor(foregroundLab.Alpha, 5, foregroundLab.a, foregroundLab.b);
}
else if (highlightLab.L < 50 && foregroundLab.L < 50)
{
newForegroundLab = new LabColor(foregroundLab.Alpha, 95, foregroundLab.a, foregroundLab.b);
}
if (newForegroundLab == null)
return;
if (foreground_originalValue == null)
{
var binding = BindingOperations.GetBinding(tb, TextBlock.ForegroundProperty);
if (binding != null)
SetForegroundOriginalValue(tb, binding);
else
SetForegroundOriginalValue(tb, tb.Foreground);
}
var fgBrush = new SolidColorBrush(newForegroundLab.ToWindowsMediaColor());
fgBrush.Freeze();
SetForegroundModifiedValue(tb, fgBrush);
tb.Foreground = fgBrush;
}
else
{
var originalValue = GetForegroundOriginalValue(tb);
if (originalValue == null)
return;
if (originalValue is Binding)
{
BindingOperations.SetBinding(tb, TextBlock.ForegroundProperty, originalValue as Binding);
}
else if (originalValue != null && object.Equals(GetForegroundModifiedValue(tb), tb.Foreground))
{
tb.SetValue(TextBlock.ForegroundProperty, originalValue);
}
SetForegroundModifiedValue(tb, null);
SetForegroundOriginalValue(tb, null);
}
}