Add default model view input types and validation (#1397)

src/sql/parts/modelComponents/modelStore.ts

@@ -27,6 +27,7 @@ export class ModelStore implements IModelStore {
 	private _descriptorMappings: { [x: string]: IComponentDescriptor } = {};
 	private _componentMappings: { [x: string]: IComponent } = {};
 	private _componentActions: { [x: string]: Deferred<IComponent> } = {};
+	private _validationCallbacks: ((componentId: string) => Thenable<boolean>)[] = [];
 	constructor() {
 	}
 
@@ -66,6 +67,15 @@ export class ModelStore implements IModelStore {
 		}
 	}
 
+	registerValidationCallback(callback: (componentId: string) => Thenable<boolean>): void {
+		this._validationCallbacks.push(callback);
+	}
+
+	validate(component: IComponent): Thenable<boolean> {
+		let componentId = Object.entries(this._componentMappings).find(([id, mappedComponent]) => component === mappedComponent)[0];
+		return Promise.all(this._validationCallbacks.map(callback => callback(componentId))).then(validations => validations.every(validation => validation === true));
+	}
+
 	private addPendingAction<T>(componentId: string, action: (component: IComponent) => T): Promise<T> {
 		// We create a promise and chain it onto a tracking promise whose resolve method
 		// will only be called once the component is created