lazy-widgets/dist/widgets/PassthroughWidget.js

Typescript retained mode GUI for the HTML canvas API

import { SingleParent } from './SingleParent.js';
import { PropagationModel } from '../events/WidgetEvent.js';
import { SingleParentXMLInputConfig } from '../xml/SingleParentXMLInputConfig.js';
/**
 * A {@link SingleParent} which contains a single child and does nothing,
 * passing all events through to its child. Useful for widgets that are only
 * used for logic, like {@link ThemeScope}.
 *
 * Can be constrained to a specific type of children.
 *
 * Since this does nothing on its own, it should not be used on its own.
 * Instead, extend this class if you are looking for a way to do wrapper widgets
 * that provide extra logic.
 *
 * @category Widget
 */
export class PassthroughWidget extends SingleParent {
    constructor(child, properties) {
        // Passthrough widgets dont need a clear background, have a child and
        // propagate events
        super(child, properties);
    }
    handleEvent(event) {
        if (event.propagation !== PropagationModel.Trickling) {
            return super.handleEvent(event);
        }
        else {
            return this.child.dispatchEvent(event);
        }
    }
    handlePreLayoutUpdate() {
        // Pre-layout update child
        const child = this.child;
        child.preLayoutUpdate();
        // If child's layout is dirty, set self's layout as dirty
        if (child.layoutDirty) {
            this._layoutDirty = true;
        }
    }
    handlePostLayoutUpdate() {
        // Post-layout update child
        this.child.postLayoutUpdate();
    }
    handleResolveDimensions(minWidth, maxWidth, minHeight, maxHeight) {
        // Resolve child's dimensions and set own resolved dimensions to be
        // equal to the child's
        const child = this.child;
        child.resolveDimensions(minWidth, maxWidth, minHeight, maxHeight);
        [this.idealWidth, this.idealHeight] = child.idealDimensions;
    }
    resolvePosition(x, y) {
        super.resolvePosition(x, y);
        // Resolve child's position to be the same as this widget's position
        this.child.resolvePosition(x, y);
    }
    handlePainting(dirtyRects) {
        // Paint child
        this.child.paint(dirtyRects);
    }
}
PassthroughWidget.autoXML = {
    name: 'passthrough-widget',
    inputConfig: SingleParentXMLInputConfig
};
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