public ShapeAlterationBuilder BoundAs(string bindingSource, Func <ShapeDescriptor, Func <DisplayContext, Task <IHtmlContent> > > binder)
{
// schedule the configuration
return(Configure(descriptor =>
{
Func <DisplayContext, Task <IHtmlContent> > target = null;
var binding = new ShapeBinding
{
ShapeDescriptor = descriptor,
BindingName = _bindingName,
BindingSource = bindingSource,
BindingAsync = 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;
});
}
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);
}
};
var prefix = _bindingType == "Display" ? string.Empty : string.Concat(_bindingType, "@");
// ShapeDescriptor.Bindings is a case insensitive dictionary
descriptor.Bindings[prefix + _bindingName] = binding;
}));
}
public bool TryGetDescriptorBinding(string shapeType, out ShapeBinding shapeBinding) {
shapeBinding = null;
if (!Enabled)
return false;
var currentThemeName = _siteThemeService.GetCurrentThemeName();
var shapeTable = _shapeTableLocator.Lookup(currentThemeName);
return shapeTable.Bindings.TryGetValue(shapeType, out shapeBinding);
}
public bool TryGetDescriptorBinding(string shapeType, out ShapeBinding shapeBinding) {
var processors = BuildShapeProcessors();
TemplateResult templateResult = null;
if (processors.TryGetValue(shapeType, out templateResult)) {
shapeBinding = new ShapeBinding {
BindingName = "Templates",
Binding = ctx => CoerceHtmlString(_templateService.Execute(
templateResult.Template,
templateResult.Name,
templateResult.Processor, ctx.Value)),
ShapeDescriptor = new ShapeDescriptor { ShapeType = shapeType }
};
return true;
}
shapeBinding = null;
return false;
}
private 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()) {
foreach (var shapeBindingResolver in _shapeBindingResolvers) {
if(shapeBindingResolver.TryGetDescriptorBinding(shapeAlternate, out shapeBinding)) {
return true;
}
}
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 (; ; ) {
foreach (var shapeBindingResolver in _shapeBindingResolvers) {
if (shapeBindingResolver.TryGetDescriptorBinding(shapeTypeScan, out shapeBinding)) {
return true;
}
}
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));
}
static async Task<IHtmlContent> ProcessAsync(ShapeBinding shapeBinding, IShape shape, DisplayContext context)
{
if (shapeBinding == null || shapeBinding.BindingAsync == null)
{
// todo: create result from all child shapes
return shape.Metadata.ChildContent ?? HtmlString.Empty;
}
return CoerceHtmlString(await shapeBinding.BindingAsync(context));
}