Small refactoring, several tests added

js/template/BlueprintTemplate.js

@@ -69,8 +69,10 @@ export default class BlueprintTemplate extends ITemplate {
         const bounding = this.viewportElement.getBoundingClientRect()
         this.viewportSize[0] = bounding.width
         this.viewportSize[1] = bounding.height
-        this.blueprint.requestUpdate()
-        this.blueprint.updateComplete.then(() => this.centerContentInViewport())
+        if (this.blueprint.nodes.length > 0) {
+            this.blueprint.requestUpdate()
+            this.blueprint.updateComplete.then(() => this.centerContentInViewport())
+        }
     }
 
     cleanup() {
@@ -186,6 +188,10 @@ export default class BlueprintTemplate extends ITemplate {
         ))
     }
 
+    getCopyInputObject() {
+        return this.getInputObject(Copy)
+    }
+
     /**
      * @param {Number} x
      * @param {Number} y

js/template/ITemplate.js

@@ -31,6 +31,14 @@ export default class ITemplate {
         return /** @type {IInput[]} */([])
     }
 
+    /**
+     * @template {IInput} T
+     * @param {new () => T} type
+     */
+    getInputObject(type) {
+        return /** @type {T} */(this.inputObjects.find(object => object.constructor == type))
+    }
+
     setup() {
         this.#inputObjects.forEach(v => v.setup())
     }