private static void SetState(UIRenderContext context, ThemeState state)
{
if (state != null)
context.Data[StateId] = state;
else
context.Data.Remove(StateId);
}
/// <summary>
/// Gets the foreground with pre-multiplied alpha for the given opacity.
/// </summary>
private static Color GetForeground(UIControl control, ThemeState state, float opacity)
{
Color foreground = (state != null && state.Foreground.HasValue) ? state.Foreground.Value : control.Foreground;
// Premultiply with alpha.
return Color.FromNonPremultiplied(foreground.ToVector4() * new Vector4(1, 1, 1, opacity));
#else
return ColorFromNonPremultiplied(foreground.ToVector4() * new Vector4(1, 1, 1, opacity));
}
/// <summary>
/// RenderCallback for the style "ProgressBar".
/// </summary>
private void RenderProgressBar(UIControl control, UIRenderContext context)
{
// See comments of RenderSlider above.
ThemeImage indicatorImage = null;
ThemeState state = GetState(context);
if (state != null)
{
foreach (var image in state.Images)
{
if (image.Name == "Indicator")
indicatorImage = image;
else if (!image.IsOverlay)
RenderImage(GetActualBoundsRounded(control), image, context.Opacity, context.RenderTransform);
}
}
ProgressBar bar = control as ProgressBar;
if (indicatorImage != null && bar != null)
{
RectangleF indicatorBounds = GetContentBoundsRounded(bar);
// Render indicator.
if (!bar.IsIndeterminate)
{
indicatorBounds.Width = (int)((bar.Value - bar.Minimum) / (bar.Maximum - bar.Minimum) * indicatorBounds.Width);
}
else
{
// In indeterminate mode the indicator is 1/4 wide and moves left and right.
float width = indicatorBounds.Width / 4.0f;
float range = width * 3;
float center = indicatorBounds.X + width / 2 + (bar.Value - bar.Minimum) / (bar.Maximum - bar.Minimum) * range;
indicatorBounds.X = (int)(center - width / 2);
indicatorBounds.Width = (int)(width);
}
if (indicatorBounds.Width > 0 && indicatorBounds.Height > 0)
RenderImage(indicatorBounds, indicatorImage, context.Opacity, context.RenderTransform);
}
foreach (var child in control.VisualChildren)
child.Render(context);
RenderImages(control, context, true);
}
/// <summary>
/// RenderCallback for the style "Slider".
/// </summary>
private void RenderSlider(UIControl control, UIRenderContext context)
{
// Special: An image with the name "Indicator" is drawn from the left up to the slider
// position.
ThemeImage indicatorImage = null;
ThemeState state = GetState(context);
if (state != null)
{
// Background images - except the image called "Indicator".
foreach (var image in state.Images)
{
if (image.Name == "Indicator")
indicatorImage = image;
else if (!image.IsOverlay)
RenderImage(GetActualBoundsRounded(control), image, context.Opacity, context.RenderTransform);
}
}
// Render indicator image.
Slider slider = control as Slider;
if (indicatorImage != null && slider != null)
{
RectangleF indicatorBounds = GetContentBoundsRounded(slider);
// Size of indicator image depends on the slider value.
indicatorBounds.Width = (int)((slider.Value - slider.Minimum)/ (slider.Maximum - slider.Minimum) * indicatorBounds.Width);
if (indicatorBounds.Width > 0 && indicatorBounds.Height > 0)
RenderImage(indicatorBounds, indicatorImage, context.Opacity, context.RenderTransform);
}
// Visual children.
foreach (var child in control.VisualChildren)
child.Render(context);
// Overlay images.
RenderImages(control, context, true);
}
/// <summary>
/// Gets the effective opacity (the product of the opacities of all visual ancestors).
/// </summary>
private static float GetOpacity(UIControl control, UIRenderContext context, ThemeState state)
{
float opacity = (state != null && state.Opacity.HasValue) ? state.Opacity.Value : control.Opacity;
return opacity * context.Opacity;
}
