void CreateWidgets()
{
grid.Children.Clear();
var effect = CurrentEffect;
if (effect == null)
{
return;
}
var metadata = EffectMetadata.Get(effect.Type);
// Create XAML elements and choose their label strings.
var widgets = new List <UIElement>();
var widgetNames = new List <string>();
foreach (var parameter in metadata.Parameters)
{
CreateParameterWidgets(effect, parameter, widgets, widgetNames);
if (widgetNames.Count < widgets.Count)
{
widgetNames.Add(FormatParameterName(parameter.Name));
}
}
// Populate the grid.
for (int row = 0; row < widgets.Count; row++)
{
var label = new TextBlock {
Text = widgetNames[row]
};
AddToGrid(label, row, 0);
AddToGrid(widgets[row], row, 2);
}
}
public ICanvasImage Apply(ICanvasImage image, ref Rect?bounds)
{
if (!IsEnabled)
{
return(image);
}
var metadata = EffectMetadata.Get(type);
// Instantiate the effect.
var effect = (ICanvasImage)Activator.CreateInstance(metadata.ImplementationType);
// Set the effect input.
SetProperty(effect, "Source", image);
// Set configurable parameter values.
foreach (var parameter in metadata.Parameters)
{
var value = GetParameter(parameter);
SetProperty(effect, parameter.Name, value);
// Track the image bounds if cropping changes them.
if (this.Type == EffectType.Crop && parameter.Name == "SourceRectangle")
{
bounds = bounds.HasValue ? RectHelper.Intersect(bounds.Value, (Rect)value) : (Rect)value;
}
}
// Set any constant values.
foreach (var constant in metadata.Constants)
{
SetProperty(effect, constant.Key, constant.Value);
}
return(effect);
}
