public ShapeAlterationBuilder BoundAs(string bindingSource, Func <ShapeDescriptor, Func <DisplayContext, IHtmlString> > binder)
{
// schedule the configuration
return(Configure(descriptor => {
Func <DisplayContext, IHtmlString> target = null;
var binding = new ShapeBinding {
ShapeDescriptor = descriptor,
BindingName = _bindingName,
BindingSource = bindingSource,
Binding = displayContext => {
// when used, first realize the actual target once
if (target == null)
{
target = binder(descriptor);
}
// and execute the re
return target(displayContext);
}
};
// ShapeDescriptor.Bindings is a case insensitive dictionary
descriptor.Bindings[_bindingName] = binding;
}));
}
public ShapeAlterationBuilder BoundAs(string bindingSource, Func<ShapeDescriptor, Func<DisplayContext, IHtmlString>> binder)
{
// schedule the configuration
return Configure(descriptor => {
Func<DisplayContext, IHtmlString> target = null;
var binding = new ShapeBinding {
ShapeDescriptor = descriptor,
BindingName = _bindingName,
BindingSource = bindingSource,
Binding = displayContext => {
// when used, first realize the actual target once
if (target == null)
target = binder(descriptor);
// and execute the re
return target(displayContext);
}
};
// ShapeDescriptor.Bindings is a case insensitive dictionary
descriptor.Bindings[_bindingName] = binding;
});
}
static bool TryGetDescriptorBinding(string shapeType, IEnumerable<string> shapeAlternates, ShapeTable shapeTable, out ShapeBinding shapeBinding)
{
// shape alternates are optional, fully qualified binding names
// the earliest added alternates have the lowest priority
// the descriptor returned is based on the binding that is matched, so it may be an entirely
// different descriptor if the alternate has a different base name
foreach (var shapeAlternate in shapeAlternates.Reverse()) {
if (shapeTable.Bindings.TryGetValue(shapeAlternate, out shapeBinding)) {
return true;
}
}
// when no alternates match, the shapeType is used to find the longest matching binding
// the shapetype name can break itself into shorter fallbacks at double-underscore marks
// so the shapetype itself may contain a longer alternate forms that falls back to a shorter one
var shapeTypeScan = shapeType;
for (; ; ) {
if (shapeTable.Bindings.TryGetValue(shapeTypeScan, out shapeBinding)) {
return true;
}
var delimiterIndex = shapeTypeScan.LastIndexOf("__");
if (delimiterIndex < 0) {
shapeBinding = null;
return false;
}
shapeTypeScan = shapeTypeScan.Substring(0, delimiterIndex);
}
}
static IHtmlString Process(ShapeBinding shapeBinding, IShape shape, DisplayContext context)
{
if (shapeBinding == null || shapeBinding.Binding == null) {
// todo: create result from all child shapes
return shape.Metadata.ChildContent ?? new HtmlString("");
}
return CoerceHtmlString(shapeBinding.Binding(context));
}
