chore(types): allow containers to constrain children

src/public/app/components/component.ts

@@ -12,12 +12,12 @@ import { CommandMappings, CommandNames } from './app_context.js';
  * - although the execution is async, we are collecting all the promises, and therefore it is possible to wait until the
  *   event / command is executed in all components - by simply awaiting the `triggerEvent()`.
  */
-export default class Component {
+export class TypedComponent<ChildT extends TypedComponent<ChildT>> {
     $widget!: JQuery<HTMLElement>;
     componentId: string;
-    children: Component[];
+    children: ChildT[];
     initialized: Promise<void> | null;
-    parent?: Component;
+    parent?: TypedComponent<any>;
     position!: number;
 
     constructor() {
@@ -31,12 +31,12 @@ export default class Component {
         return this.constructor.name.replace(/[^A-Z0-9]/ig, "_");
     }
 
-    setParent(parent: Component) {
+    setParent(parent: TypedComponent<any>) {
         this.parent = parent;
         return this;
     }
 
-    child(...components: Component[]) {
+    child(...components: ChildT[]) {
         for (const component of components) {
             component.setParent(this);
 
@@ -122,3 +122,5 @@ export default class Component {
         return promise;
     }
 }
+
+export default class Component extends TypedComponent<Component> {}

src/public/app/widgets/basic_widget.ts

@@ -1,14 +1,9 @@
-import Component from "../components/component.js";
+import Component, { TypedComponent } from "../components/component.js";
 import froca from "../services/froca.js";
 import { t } from "../services/i18n.js";
 import toastService from "../services/toast.js";
 
-/**
- * This is the base widget for all other widgets.
- *
- * For information on using widgets, see the tutorial {@tutorial widget_basics}.
- */
-class BasicWidget extends Component {
+export class TypedBasicWidget<T extends TypedComponent<any>> extends TypedComponent<T> {
     protected attrs: Record<string, string>;
     private classes: string[];
     private childPositionCounter: number;
@@ -27,7 +22,7 @@ class BasicWidget extends Component {
         this.childPositionCounter = 10;
     }
 
-    child(...components: Component[]) {
+    child(...components: T[]) {
         if (!components) {
             return this;
         }
@@ -53,7 +48,7 @@ class BasicWidget extends Component {
      * @param components the components to be added as children to this component provided the condition is truthy.
      * @returns self for chaining.
      */
-    optChild(condition: boolean, ...components: Component[]) {
+    optChild(condition: boolean, ...components: T[]) {
         if (condition) {
             return this.child(...components);
         } else {
@@ -259,4 +254,11 @@ class BasicWidget extends Component {
     cleanup() {}
 }
 
-export default BasicWidget;
+/**
+ * This is the base widget for all other widgets.
+ *
+ * For information on using widgets, see the tutorial {@tutorial widget_basics}.
+ */
+export default class BasicWidget extends TypedBasicWidget<Component> {
+
+}

src/public/app/widgets/containers/container.js

@@ -1,18 +0,0 @@
-import BasicWidget from "../basic_widget.js";
-
-export default class Container extends BasicWidget {
-    doRender() {
-        this.$widget = $(`<div>`);
-        this.renderChildren();
-    }
-
-    renderChildren() {
-        for (const widget of this.children) {
-            try {
-                this.$widget.append(widget.render());
-            } catch (e) {
-                widget.logRenderingError(e);
-            }
-        }
-    }
-}

src/public/app/widgets/containers/container.ts

@@ -0,0 +1,30 @@
+import Component, { TypedComponent } from "../../components/component.js";
+import BasicWidget, { TypedBasicWidget } from "../basic_widget.js";
+
+export default class Container<T extends TypedComponent<any>> extends TypedBasicWidget<T> {
+
+    doRender() {
+        this.$widget = $(`<div>`);
+        this.renderChildren();
+    }
+
+    renderChildren() {
+        for (const widget of this.children) {
+            if (!("render" in widget)) {
+                throw "Non-renderable widget encountered.";
+            }
+
+            const typedWidget = widget as unknown as TypedBasicWidget<any>;
+
+            try {
+                if ("render" in widget) {
+                    this.$widget.append(typedWidget.render());
+                }
+
+            } catch (e: any) {
+                typedWidget.logRenderingError(e);
+            }
+        }
+    }
+
+}

src/public/app/widgets/containers/flex_container.ts

@@ -1,8 +1,9 @@
+import { TypedComponent } from "../../components/component.js";
 import Container from "./container.js";
 
 export type FlexDirection = "row" | "column";
 
-export default class FlexContainer extends Container {
+export default class FlexContainer<T extends TypedComponent<any>> extends Container<T> {
 
     constructor(direction: FlexDirection) {
         super();
@@ -13,4 +14,5 @@ export default class FlexContainer extends Container {
 
         this.attrs.style = `display: flex; flex-direction: ${direction};`;
     }
+
 }

src/public/app/widgets/containers/launcher_container.ts

@@ -4,7 +4,7 @@ import appContext, { EventData } from "../../components/app_context.js";
 import LauncherWidget from "./launcher.js";
 import utils from "../../services/utils.js";
 
-export default class LauncherContainer extends FlexContainer {
+export default class LauncherContainer extends FlexContainer<LauncherWidget> {
     private isHorizontalLayout: boolean;
 
     constructor(isHorizontalLayout: boolean) {

src/public/app/widgets/containers/right_pane_container.ts

@@ -1,7 +1,11 @@
 import FlexContainer from "./flex_container.js";
 import splitService from "../../services/resizer.js";
+import RightPanelWidget from "../right_panel_widget.js";
+
+export default class RightPaneContainer extends FlexContainer<RightPanelWidget> {
+
+    private rightPaneHidden: boolean;
 
-export default class RightPaneContainer extends FlexContainer {
     constructor() {
         super('column');
 
@@ -19,7 +23,7 @@ export default class RightPaneContainer extends FlexContainer {
             && !!this.children.find(ch => ch.isEnabled() && ch.canBeShown());
     }
 
-    handleEventInChildren(name, data) {
+    handleEventInChildren(name: string, data: unknown) {
         const promise = super.handleEventInChildren(name, data);
 
         if (['activeContextChanged', 'noteSwitchedAndActivated', 'noteSwitched'].includes(name)) {

src/public/app/widgets/mobile_widgets/sidebar_container.ts

@@ -1,5 +1,6 @@
 import { EventData } from "../../components/app_context.js";
 import { Screen } from "../../components/mobile_screen_switcher.js";
+import BasicWidget from "../basic_widget.js";
 import FlexContainer, { FlexDirection } from "../containers/flex_container.js";
 
 const DRAG_STATE_NONE = 0;
@@ -14,7 +15,7 @@ const DRAG_CLOSED_START_THRESHOLD = 10;
 /** The number of pixels the user has to drag across the screen to the left when the sidebar is opened to trigger the drag close animation. */
 const DRAG_OPENED_START_THRESHOLD = 80;
 
-export default class SidebarContainer extends FlexContainer {
+export default class SidebarContainer extends FlexContainer<BasicWidget> {
 
     private screenName: Screen;
     /** The screen name that is currently active, according to the screen changed event. */

src/public/app/widgets/right_panel_widget.ts

@@ -1,6 +1,5 @@
+import BasicWidget from "./basic_widget.js";
 import NoteContextAwareWidget from "./note_context_aware_widget.js";
-import toastService from "../services/toast.js";
-import { t } from "../services/i18n.js";
 
 const WIDGET_TPL = `
 <div class="card widget">
@@ -19,6 +18,12 @@ const WIDGET_TPL = `
  * @extends {NoteContextAwareWidget}
  */
 class RightPanelWidget extends NoteContextAwareWidget {
+
+    private $bodyWrapper!: JQuery<HTMLElement>;
+    $body!: JQuery<HTMLElement>;
+    private $title!: JQuery<HTMLElement>;
+    private $buttons!: JQuery<HTMLElement>;
+
     /** Title to show in the panel. */
     get widgetTitle() { return "Untitled widget"; }
 
@@ -53,7 +58,7 @@ class RightPanelWidget extends NoteContextAwareWidget {
         this.$buttons.empty();
 
         for (const buttonWidget of this.children) {
-            this.$buttons.append(buttonWidget.render());
+            this.$buttons.append((buttonWidget as BasicWidget).render());
         }
 
         this.initialized = this.doRenderBody().catch(e => {