lazy-widgets/dist/widgets/Parent.js

Typescript retained mode GUI for the HTML canvas API

import { Widget } from '../widgets/Widget.js';
/**
 * A class for widgets which may have children.
 *
 * Overrides the {@link Widget#inheritedTheme} accessor so that inherited themes
 * are propagated to children. Also provides a getter for the amount of children
 * that this parent has, and is an iterable which iterates each child of this
 * parent. Child classes are responsible for implementing both the getter and
 * the iterator.
 *
 * Can be constrained to a specific type of children.
 *
 * See {@link MultiParent} and {@link SingleParent} for more specialised
 * versions.
 *
 * @category Widget
 */
export class Parent extends Widget {
    set inheritedTheme(theme) {
        super.inheritedTheme = theme;
        for (const child of this) {
            child.inheritedTheme = theme;
        }
    }
    get inheritedTheme() {
        return super.inheritedTheme;
    }
    handleAttachment() {
        for (const child of this) {
            child.attach(this._root, this._viewport, this);
        }
    }
    handleDetachment() {
        for (const child of this) {
            child.detach();
        }
    }
    updateActiveState() {
        const changed = super.updateActiveState();
        if (changed) {
            for (const child of this) {
                child.updateActiveState();
            }
        }
        return changed;
    }
    finalizeBounds() {
        super.finalizeBounds();
        for (const child of this) {
            child.finalizeBounds();
        }
    }
}
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