Intermediary refactoring

Customizations/TagRendering.ts

@@ -1,17 +1,18 @@
 import {UIElement} from "../UI/UIElement";
 import {UIEventSource} from "../UI/UIEventSource";
 import {And, Tag, TagsFilter, TagUtils} from "../Logic/TagsFilter";
-import {UIRadioButton} from "../UI/Base/UIRadioButton";
 import {FixedUiElement} from "../UI/Base/FixedUiElement";
 import {SaveButton} from "../UI/SaveButton";
 import {Changes} from "../Logic/Changes";
-import {TextField} from "../UI/Base/TextField";
-import {UIInputElement} from "../UI/Base/UIInputElement";
-import {UIRadioButtonWithOther} from "../UI/Base/UIRadioButtonWithOther";
 import {VariableUiElement} from "../UI/Base/VariableUIElement";
 import {TagDependantUIElement, TagDependantUIElementConstructor} from "./UIElementConstructor";
 import {OnlyShowIfConstructor} from "./OnlyShowIf";
 import {UserDetails} from "../Logic/OsmConnection";
+import {TextField} from "../UI/Input/TextField";
+import {InputElement} from "../UI/Input/InputElement";
+import {InputElementWrapper} from "../UI/Input/InputElementWrapper";
+import {FixedInputElement} from "../UI/Input/FixedInputElement";
+import {RadioButton} from "../UI/Input/RadioButton";
 
 export class TagRenderingOptions implements TagDependantUIElementConstructor {
 
@@ -129,12 +130,9 @@ export class TagRenderingOptions implements TagDependantUIElementConstructor {
 class TagRendering extends UIElement implements TagDependantUIElement {
 
 
-    private _priority: number;
     private _userDetails: UIEventSource<UserDetails>;
+    private _priority: number;
 
-    Priority(): number {
-        return this._priority;
-    }
 
     private _question: string;
     private _primer: string;
@@ -150,8 +148,8 @@ class TagRendering extends UIElement implements TagDependantUIElement {
         extraTags?: TagsFilter
     };
 
-    private readonly _questionElement: UIElement;
-    private readonly _textField: TextField<TagsFilter>; // Only here to update
+
+    private readonly _questionElement: InputElement<TagsFilter>;
 
     private readonly _saveButton: UIElement;
     private readonly _skipButton: UIElement;
@@ -238,60 +236,12 @@ class TagRendering extends UIElement implements TagDependantUIElement {
             }
         }
 
-        // Map radiobutton choice and textfield answer onto tagfilter. That tagfilter will be pushed into the changes later on
-        const pickChoice = (i => {
-            if (i === undefined || i === null) {
-                return undefined
-            }
-            return self._mapping[i].k
-        });
-        const pickString =
-            (string) => {
-                if (string === "" || string === undefined) {
-                    return undefined;
-                }
-                const tag = new Tag(self._freeform.key, string);
-                if (self._freeform.extraTags === undefined) {
-                    return tag;
-                }
-                return new And([
-                        self._freeform.extraTags,
-                        tag
-                    ]
-                );
-            };
-
 
         // Prepare the actual input element -> pick an appropriate implementation
-        let inputElement: UIInputElement<TagsFilter>;
-
-        
-        if (this._freeform !== undefined && this._mapping !== undefined) {
-            // Radio buttons with 'other'
-            inputElement = new UIRadioButtonWithOther(
-                choices,
-                this._freeform.template,
-                this._freeform.placeholder,
-                pickChoice,
-                pickString
-            );
-            this._questionElement = inputElement;
-        } else if (this._mapping !== [] && this._mapping.length > 0) {
-            // This is a classic radio selection element
-            inputElement = new UIRadioButton(new UIEventSource(choices), pickChoice, false)
-            this._questionElement = inputElement;
-        } else if (this._freeform !== undefined) {
-            this._textField = new TextField(new UIEventSource<string>(this._freeform.placeholder), pickString);
-            inputElement = this._textField;
-            this._questionElement = new FixedUiElement(
-                "<div>" + this._freeform.template.replace("$$$", inputElement.Render()) + "</div>")
-        } else {
-            throw "Invalid questionRendering, expected at least choices or a freeform"
-        }
-
 
+        this._questionElement = this.InputElementFor(options);
         const save = () => {
-            const selection = inputElement.GetValue().data;
+            const selection = self._questionElement.GetValue().data;
             if (selection) {
                 changes.addTag(tags.data.id, selection);
             }
@@ -305,21 +255,16 @@ class TagRendering extends UIElement implements TagDependantUIElement {
         }
 
         // Setup the save button and it's action
-        this._saveButton = new SaveButton(inputElement.GetValue())
+        this._saveButton = new SaveButton(this._questionElement.GetValue())
             .onClick(save);
 
+        this._editButton = new FixedUiElement("");
         if (this._question !== undefined) {
             this._editButton = new FixedUiElement("<img class='editbutton' src='./assets/pencil.svg' alt='edit'>")
                 .onClick(() => {
-                    console.log("Click", self._editButton);
-                    if (self._textField) {
-                        self._textField.value.setData(self._source.data["name"] ?? "");
-                    }
-
+                    self._questionElement.GetValue().setData(self.CurrentValue());
                     self._editMode.setData(true);
                 });
-        } else {
-            this._editButton = new FixedUiElement("");
         }
 
 
@@ -332,15 +277,95 @@ class TagRendering extends UIElement implements TagDependantUIElement {
         });
         // And at last, set up the skip button
         this._skipButton = new VariableUiElement(cancelContents).onClick(cancel);
+    }
 
 
+    private InputElementFor(options: {
+        freeform?: {
+            key: string, template: string,
+            renderTemplate: string
+            placeholder?: string,
+            extraTags?: TagsFilter,
+        },
+        mappings?: { k: TagsFilter, txt: string, priority?: number, substitute?: boolean }[]
+    }):
+        InputElement<TagsFilter> {
+
+        const elements = [];
+
+        if (options.mappings !== undefined) {
+            for (const mapping of options.mappings) {
+                elements.push(this.InputElementForMapping(mapping));
+            }
+        }
+
+        if (options.freeform !== undefined) {
+            elements.push(this.InputForFreeForm(options.freeform));
+        }
+
+
+        if (elements.length == 0) {
+            throw "NO TAGRENDERINGS!"
+        }
+        if (elements.length == 1) {
+            return elements[0];
+        }
+
+        return new RadioButton(elements, false);
+
     }
 
-    private ApplyTemplate(template: string): string {
-        const tags = this._tagsPreprocessor(this._source.data);
-        return TagUtils.ApplyTemplate(template, tags);
+
+    private InputElementForMapping(mapping: { k: TagsFilter, txt: string }) {
+        return new FixedInputElement(mapping.txt, mapping.k);
     }
 
+
+    private InputForFreeForm(freeform): InputElement<TagsFilter> {
+        if (freeform === undefined) {
+            return undefined;
+        }
+
+
+        const pickString =
+            (string) => {
+                if (string === "" || string === undefined) {
+                    return undefined;
+                }
+                const tag = new Tag(freeform.key, string);
+                if (freeform.extraTags === undefined) {
+                    return tag;
+                }
+                return new And([
+                        freeform.extraTags,
+                        tag
+                    ]
+                );
+            };
+
+        const toString =
+            (tag) => {
+                if (tag instanceof And) {
+                    return toString(tag.and[0])
+                } else if (tag instanceof Tag) {
+                    return tag.value
+                }
+                return undefined;
+            }
+
+
+        let inputElement: InputElement<TagsFilter>;
+        const textField = new TextField({
+            placeholder: this._freeform.placeholder,
+            fromString: pickString,
+            toString: toString
+        });
+
+        const prepost = freeform.template.split("$$$");
+        return new InputElementWrapper(prepost[0], textField, prepost[1]);
+    }
+
+
     IsKnown(): boolean {
         const tags = TagUtils.proprtiesToKV(this._source.data);
 
@@ -353,6 +378,22 @@ class TagRendering extends UIElement implements TagDependantUIElement {
         return this._freeform !== undefined && this._source.data[this._freeform.key] !== undefined;
     }
 
+    private CurrentValue(): TagsFilter {
+        const tags = TagUtils.proprtiesToKV(this._source.data);
+
+        for (const oneOnOneElement of this._mapping.concat(this._renderMapping)) {
+            if (oneOnOneElement.k === null || oneOnOneElement.k.matches(tags)) {
+                return oneOnOneElement.k;
+            }
+        }
+        if (this._freeform === undefined) {
+            return undefined;
+        }
+
+        return new Tag(this._freeform.key, this._source.data[this._freeform.key]);
+    }
+
+
     IsQuestioning(): boolean {
         if (this.IsKnown()) {
             return false;
@@ -441,13 +482,15 @@ class TagRendering extends UIElement implements TagDependantUIElement {
 
     }
 
-    InnerUpdate(htmlElement: HTMLElement) {
-        super.InnerUpdate(htmlElement);
-        this._questionElement.Update();
-        this._saveButton.Update();
-        this._skipButton.Update();
-        this._textField?.Update();
-        this._editButton.Update();
+
+    Priority(): number {
+        return this._priority;
     }
 
+    private ApplyTemplate(template: string): string {
+        const tags = this._tagsPreprocessor(this._source.data);
+        return TagUtils.ApplyTemplate(template, tags);
+    }
+
+
 }

UI/AddButton.ts

@@ -123,6 +123,7 @@ export class AddButton extends UIElement {
         const self = this;
 
         htmlElement.onclick = function (event) {
+            // @ts-ignore
             if(event.consumed){
                 return;
             }

UI/Base/FixedUiElement.ts

@@ -5,7 +5,7 @@ export class FixedUiElement extends UIElement {
 
     constructor(html: string) {
         super(undefined);
-        this._html = html;
+        this._html = html ?? "";
     }
 
     protected InnerRender(): string {

UI/Base/UIInputElement.ts

@@ -1,10 +0,0 @@
-import {UIElement} from "../UIElement";
-import {UIEventSource} from "../UIEventSource";
-
-export abstract class UIInputElement<T> extends UIElement{
-    
-    abstract GetValue() : UIEventSource<T>;
-    
-    
-    
-}

UI/FeatureInfoBox.ts

@@ -115,4 +115,6 @@ export class FeatureInfoBox extends UIElement {
             "</div>";
     }
     
+    
+
 }

UI/ImageUploadFlow.ts

@@ -3,7 +3,7 @@ import {UIEventSource} from "./UIEventSource";
 import $ from "jquery"
 import {Imgur} from "../Logic/Imgur";
 import {UserDetails} from "../Logic/OsmConnection";
-import {DropDownUI} from "./Base/DropDownUI";
+import {DropDown} from "./Input/DropDown";
 import {VariableUiElement} from "./Base/VariableUIElement";
 
 export class ImageUploadFlow extends UIElement {
@@ -31,7 +31,7 @@ export class ImageUploadFlow extends UIElement {
         this._uploadOptions = uploadOptions;
         this.ListenTo(this._isUploading);
 
-        const licensePicker = new DropDownUI("Jouw foto wordt gepubliceerd ",
+        const licensePicker = new DropDown("Jouw foto wordt gepubliceerd ",
 
             [
                 {value: "CC0", shown: "in het publiek domein"},

UI/Input/DropDown.ts

@@ -1,7 +1,7 @@
 import {UIEventSource} from "../UIEventSource";
 import {UIElement} from "../UIElement";
 
-export class DropDownUI extends UIElement {
+export class DropDown extends UIElement {
 
     selectedElement: UIEventSource<string>
     private _label: string;

UI/Input/FixedInputElement.ts

@@ -1,10 +1,10 @@
-import {UIInputElement} from "./UIInputElement";
+import {InputElement} from "./InputElement";
 import {UIEventSource} from "../UIEventSource";
 import {UIElement} from "../UIElement";
-import {FixedUiElement} from "./FixedUiElement";
+import {FixedUiElement} from "../Base/FixedUiElement";
 
 
-export class FixedInputElement<T> extends UIInputElement<T> {
+export class FixedInputElement<T> extends InputElement<T> {
     private rendering: UIElement;
     private value: UIEventSource<T>;
 
@@ -22,4 +22,8 @@ export class FixedInputElement<T> extends UIInputElement<T> {
         return this.rendering.Render();
     }
 
+    IsValid(t: T): boolean {
+        return t === this.value.data;
+    }
+
 }

UI/Input/InputElement.ts

@@ -0,0 +1,11 @@
+import {UIElement} from "../UIElement";
+import {UIEventSource} from "../UIEventSource";
+import {FixedUiElement} from "../Base/FixedUiElement";
+
+export abstract class InputElement<T> extends UIElement{
+    
+    abstract GetValue() : UIEventSource<T>;
+    
+    abstract IsValid(t: T) : boolean;
+
+}

UI/Input/InputElementWrapper.ts

@@ -0,0 +1,37 @@
+import {InputElement} from "./InputElement";
+import {UIEventSource} from "../UIEventSource";
+import {UIElement} from "../UIElement";
+import {FixedUiElement} from "../Base/FixedUiElement";
+
+
+export class InputElementWrapper<T> extends InputElement<T>{
+    private pre: UIElement ;
+    private input: InputElement<T>;
+    private post: UIElement ;
+    
+    constructor(
+        pre: UIElement | string,
+        input: InputElement<T>,
+        post: UIElement | string
+        
+    ) {
+        super(undefined);
+        this.pre = typeof(pre) === 'string' ?  new FixedUiElement(pre) : pre
+        this.input = input;
+        this.post =typeof(post) === 'string' ?  new FixedUiElement(post) : post
+    }
+    
+    
+    GetValue(): UIEventSource<T> {
+        return this.input.GetValue();
+    }
+
+    protected InnerRender(): string {
+        return this.pre.Render() + this.input.Render() + this.post.Render();
+    }
+
+    IsValid(t: T): boolean {
+        return this.input.IsValid(t);
+    }
+    
+}

UI/Input/RadioButton.ts

@@ -1,31 +1,27 @@
 import {UIElement} from "../UIElement";
 import {UIEventSource} from "../UIEventSource";
-import {UIInputElement} from "./UIInputElement";
+import {InputElement} from "./InputElement";
 
-export class UIRadioButton<T> extends UIInputElement<T> {
+export class RadioButton<T> extends InputElement<T> {
 
-    public readonly SelectedElementIndex: UIEventSource<number>
+    private readonly _selectedElementIndex: UIEventSource<number>
         = new UIEventSource<number>(null);
 
     private value: UIEventSource<T>;
-    private readonly _elements: UIInputElement<T>[]
+    private readonly _elements: InputElement<T>[]
     private _selectFirstAsDefault: boolean;
-    private _valueMapping: (i: number) => T;
 
 
-    constructor(elements: UIInputElement<T>[],
+    constructor(elements: InputElement<T>[],
                 selectFirstAsDefault = true) {
         super(undefined);
         this._elements = elements;
         this._selectFirstAsDefault = selectFirstAsDefault;
         const self = this;
-        this.SelectedElementIndex.addCallback(() => {
-            self.InnerUpdate(undefined);
-        })
 
 
         this.value =
-            UIEventSource.flatten(this.SelectedElementIndex.map(
+            UIEventSource.flatten(this._selectedElementIndex.map(
                 (selectedIndex) => {
                     if (selectedIndex !== undefined && selectedIndex !== null) {
                         return elements[selectedIndex].GetValue()
@@ -34,14 +30,27 @@ export class UIRadioButton<T> extends UIInputElement<T> {
             ), elements.map(e => e.GetValue()))
         ;
 
+        this.value.addCallback((t) => {
+            self.SetCorrectValue(t);
+        })
 
-        for (let i = 0; i < elements.length; i ++){
-            elements[i].onClick(( ) => {
-                self.SelectedElementIndex.setData(i);
+
+        for (let i = 0; i < elements.length; i++) {
+            // If an element is clicked, the radio button corresponding with it should be selected as well
+            elements[i].onClick(() => {
+                self._selectedElementIndex.setData(i);
             });
         }
 
+    }
 
+    IsValid(t: T): boolean {
+        for (const inputElement of this._elements) {
+            if (inputElement.IsValid(t)) {
+                return true;
+            }
+        }
+        return false;
     }
 
     GetValue(): UIEventSource<T> {
@@ -70,6 +79,24 @@ export class UIRadioButton<T> extends UIInputElement<T> {
         return "<form id='" + this.id + "-form'>" + body + "</form>";
     }
 
+    private SetCorrectValue(t: T) {
+        if (t === undefined) {
+            return;
+        }
+        // We check that what is selected matches the previous rendering
+        for (let i = 0; i < this._elements.length; i++) {
+            const e = this._elements[i];
+            if (e.IsValid(t)) {
+                this._selectedElementIndex.setData(i);
+                e.GetValue().setData(t);
+                // @ts-ignore
+                document.getElementById(this.IdFor(i)).checked = true;
+                return;
+            }
+
+        }
+    }
+
     InnerUpdate(htmlElement: HTMLElement) {
         const self = this;
 
@@ -78,7 +105,7 @@ export class UIRadioButton<T> extends UIInputElement<T> {
                 const el = document.getElementById(self.IdFor(i));
                 // @ts-ignore
                 if (el.checked) {
-                    self.SelectedElementIndex.setData(i);
+                    self._selectedElementIndex.setData(i);
                 }
             }
         }
@@ -91,8 +118,9 @@ export class UIRadioButton<T> extends UIInputElement<T> {
             }
         );
 
-        if (this.SelectedElementIndex.data == null) {
         if (this._selectFirstAsDefault) {
+            this.SetCorrectValue(this.value.data);
+            if (this._selectedElementIndex.data === null || this._selectedElementIndex.data === undefined) {
                 const el = document.getElementById(this.IdFor(0));
                 if (el) {
                     // @ts-ignore
@@ -100,30 +128,10 @@ export class UIRadioButton<T> extends UIInputElement<T> {
                     checkButtons();
                 }
             }
-        } else {
-
-            // We check that what is selected matches the previous rendering
-            var checked = -1;
-            var expected = this.SelectedElementIndex.data;
-            if (expected) {
-
-                for (let i = 0; i < self._elements.length; i++) {
-                    const el = document.getElementById(self.IdFor(i));
-                    // @ts-ignore
-                    if (el.checked) {
-                        checked = i;
-                    }
-                }
-                if (expected != checked) {
-                    const el = document.getElementById(this.IdFor(expected));
-                    // @ts-ignore
-                    el.checked = true;
-                }
-            }
         }
 
 
-    }
+    };
 
 
 }

UI/Input/TextField.ts

@@ -1,9 +1,10 @@
 import {UIElement} from "../UIElement";
 import {UIEventSource} from "../UIEventSource";
-import {UIInputElement} from "./UIInputElement";
+import {InputElement} from "./InputElement";
+import {FixedUiElement} from "../Base/FixedUiElement";
 
 
-export class TextField<T> extends UIInputElement<T> {
+export class TextField<T> extends InputElement<T> {
 
     private value: UIEventSource<string>;
     private mappedValue: UIEventSource<T>;
@@ -11,28 +12,32 @@ export class TextField<T> extends UIInputElement<T> {
      * Pings and has the value data
      */
     public enterPressed = new UIEventSource<string>(undefined);
-    private _placeholder: UIEventSource<string>;
-    private _pretext: string;
-    private _fromString: (string: string) => T;
+    private _placeholder: UIElement;
+    private _fromString?: (string: string) => T;
+    private _toString: (t: T) => string;
 
     constructor(options: {
-        placeholder?: UIEventSource<string>,
-        toString: (t: T) => string,
-        fromString: (string: string) => T,
-        pretext?: string,
+        placeholder?: string | UIElement,
+        toString?: (t: T) => string,
+        fromString?: (string: string) => T,
         value?: UIEventSource<T>
     }) {
-        super(options?.placeholder);
+        super(undefined);
         this.value = new UIEventSource<string>("");
         this.mappedValue = options?.value ?? new UIEventSource<T>(undefined);
 
 
+        // @ts-ignore
+        this._fromString = options.fromString ?? ((str) => (str))
         this.value.addCallback((str) => this.mappedValue.setData(options.fromString(str)));
         this.mappedValue.addCallback((t) => this.value.setData(options.toString(t)));
 
 
-        this._placeholder = options?.placeholder ?? new UIEventSource<string>("");
-        this._pretext = options?.pretext ?? "";
+        this._placeholder = 
+            typeof(options.placeholder) === "string" ? new FixedUiElement(options.placeholder) :
+                (options.placeholder ?? new FixedUiElement(""));
+        this._toString = options.toString ?? ((t) => ("" + t));
+
 
         const self = this;
         this.mappedValue.addCallback((t) => {
@@ -40,9 +45,10 @@ export class TextField<T> extends UIInputElement<T> {
                 return;
             }
             const field = document.getElementById('text-' + this.id);
-            if (field === undefined && field === null) {
+            if (field === undefined || field === null) {
                 return;
             }
+            // @ts-ignore
             field.value = options.toString(t);
         })
     }
@@ -52,13 +58,16 @@ export class TextField<T> extends UIInputElement<T> {
     }
 
     protected InnerRender(): string {
-        return this._pretext + "<form onSubmit='return false' class='form-text-field'>" +
-            "<input type='text' placeholder='" + (this._placeholder.data ?? "") + "' id='text-" + this.id + "'>" +
+        return "<form onSubmit='return false' class='form-text-field'>" +
+            "<input type='text' placeholder='" + this._placeholder.InnerRender() + "' id='text-" + this.id + "'>" +
             "</form>";
     }
 
     InnerUpdate(htmlElement: HTMLElement) {
         const field = document.getElementById('text-' + this.id);
+        if(field === null){
+            return;
+        }
         const self = this;
         field.oninput = () => {
             // @ts-ignore
@@ -75,6 +84,14 @@ export class TextField<T> extends UIInputElement<T> {
 
     }
 
+    IsValid(t: T): boolean {
+        if(t === undefined || t === null){
+            return false;
+        }
+        const result = this._toString(t);
+        return result !== undefined && result !== null;
+    }
+
     Clear() {
         const field = document.getElementById('text-' + this.id);
         if (field !== undefined) {

UI/SearchAndGo.ts

@@ -1,5 +1,5 @@
 import {UIElement} from "./UIElement";
-import {TextField} from "./Base/TextField";
+import {TextField} from "./Input/TextField";
 import {UIEventSource} from "./UIEventSource";
 import {FixedUiElement} from "./Base/FixedUiElement";
 import {Geocoding} from "../Logic/Geocoding";
@@ -9,7 +9,10 @@ import {Basemap} from "../Logic/Basemap";
 export class SearchAndGo extends UIElement {
 
     private _placeholder = new UIEventSource("Zoek naar een locatie...")
-    private _searchField = new TextField(this._placeholder);
+    private _searchField = new TextField<string>({
+            placeholder: this._placeholder
+        }
+    );
 
     private _foundEntries = new UIEventSource([]);
     private _map: Basemap;
@@ -33,7 +36,7 @@ export class SearchAndGo extends UIElement {
 
     // Triggered by 'enter' or onclick
     private RunSearch() {
-        const searchString = this._searchField.value.data;
+        const searchString = this._searchField.GetValue().data;
         this._searchField.Clear();
         this._placeholder.setData("Bezig met zoeken...");
         const self = this;

UI/UIElement.ts

@@ -1,5 +1,4 @@
 import {UIEventSource} from "./UIEventSource";
-import instantiate = WebAssembly.instantiate;
 
 export abstract class UIElement {
     
@@ -121,5 +120,6 @@ export abstract class UIElement {
     public IsEmpty(): boolean {
         return this.InnerRender() === "";
     }
-
 }
+
+

test.ts

@@ -7,33 +7,19 @@ import {OsmLink} from "./Customizations/Questions/OsmLink";
 import {ConfirmDialog} from "./UI/ConfirmDialog";
 import {Imgur} from "./Logic/Imgur";
 import {VariableUiElement} from "./UI/Base/VariableUIElement";
-import {UIRadioButton} from "./UI/Base/UIRadioButton";
-import {FixedInputElement} from "./UI/Base/FixedInputElement";
-import {TextField} from "./UI/Base/TextField";
+import {TextField} from "./UI/Input/TextField";
+import {FixedInputElement} from "./UI/Input/FixedInputElement";
+import {RadioButton} from "./UI/Input/RadioButton";
 
 
-const buttons = new UIRadioButton<number>(
+const buttons = new RadioButton<number>(
     [new FixedInputElement("Five", 5),
         new FixedInputElement("Ten", 10),
         new TextField<number>({
             fromString: (str) => parseInt(str),
             toString: (i) => ("" + i),
         })
-    ]
+    ], false
 ).AttachTo("maindiv");
 
 buttons.GetValue().addCallback(console.log);
-buttons.GetValue().setData(10)
-
-const value = new TextField<number>({
-    fromString: (str) => parseInt(str),
-    toString: (i) => {
-        if(isNaN(i)){
-            return ""
-        }
-        return ("" + i)
-    },
-}).AttachTo("extradiv").GetValue();
-
-value.setData(42);
-value.addCallback(console.log)