/// <summary>
/// Raised when the <see cref="Color"/> property is modified.
/// </summary>
private void OnColorChanged()
{
bool isInitializing = !templateApplied && initializingProperty == null;
if (isInitializing)
{
initializingProperty = ColorProperty;
}
if (!interlock)
{
InternalColor = ColorHSV.FromColor(Color);
var colorRGBA = InternalColor.ToColor();
interlock = true;
SetCurrentValue(RedProperty, (byte)(Math.Round(colorRGBA.R * 255.0f)));
SetCurrentValue(GreenProperty, (byte)(Math.Round(colorRGBA.G * 255.0f)));
SetCurrentValue(BlueProperty, (byte)(Math.Round(colorRGBA.B * 255.0f)));
SetCurrentValue(AlphaProperty, (byte)(Math.Round(colorRGBA.A * 255.0f)));
SetCurrentValue(HueProperty, InternalColor.H);
SetCurrentValue(SaturationProperty, InternalColor.S * 100.0f);
SetCurrentValue(BrightnessProperty, InternalColor.V * 100.0f);
interlock = false;
}
if (!suspendBindingUpdates)
{
RenderColorPickerSurface();
}
else if (colorPreviewRenderSurface != null)
{
colorPreviewRenderSurface.Fill = new SolidColorBrush(Color.ToSystemColor());
}
UpdateBinding(ColorProperty);
if (isInitializing)
{
initializingProperty = null;
}
}
/// <summary>
/// Update the color surface brush according to the current <see cref="Hue"/> value.
/// </summary>
private void RenderColorPickerSurface()
{
if (colorPreviewRenderSurface != null)
{
colorPreviewRenderSurface.Fill = new SolidColorBrush(Color.ToSystemColor());
}
if (colorPickerRenderSurface != null)
{
// Ensure the color picker is loaded
if (!double.IsNaN(colorPickerRenderSurface.Width) && !double.IsNaN(colorPickerRenderSurface.Height))
{
var width = (int)colorPickerRenderSurface.Width;
var height = (int)colorPickerRenderSurface.Height;
PixelFormat pf = PixelFormats.Bgr32;
int rawStride = (width * pf.BitsPerPixel + 7) / 8;
var rawImage = new byte[rawStride * height];
for (int j = 0; j < height; ++j)
{
float y = j / (float)(height - 1);
for (int i = 0; i < width; ++i)
{
float x = i / (float)(width - 1);
var color4 = new ColorHSV(Hue, x, y, 1.0f).ToColor();
var color = new Color(color4);
rawImage[(i + j * width) * 4 + 0] = color.B;
rawImage[(i + j * width) * 4 + 1] = color.G;
rawImage[(i + j * width) * 4 + 2] = color.R;
}
}
colorPickerRenderSurface.Fill = new DrawingBrush(new ImageDrawing(BitmapSource.Create(width, height, 96, 96, pf, null, rawImage, rawStride), new Rect(0.0f, 0.0f, width, height)));
}
}
}
