@aurigma/design-atoms/ItemHandlers/ItemHandlersCollection.js

Design Atoms is a part of Customer's Canvas SDK which allows for manipulating individual design elements through your code.

import { Collection } from "@aurigma/design-atoms-model/Collection";
import { ArgumentNullException } from "@aurigma/design-atoms-model/Exception";
import { GroupItemHandler } from "./GroupItemHandler";
export class ItemHandlersCollection extends Collection {
    constructor(layer) {
        super();
        this._applyLayerAndCanvas = (handler) => {
            handler.layer = this._layer;
            const cv = this._layer.canvas;
            if (cv)
                handler.canvas = cv;
            if (handler instanceof GroupItemHandler) {
                handler.applyToItems(this._applyLayerAndCanvas);
            }
        };
        if (!layer)
            throw new ArgumentNullException("layer");
        this._layer = layer;
    }
    /**
    * Inserts handlers into the collection at the specified index.
    */
    insertAt(index, item) {
        super.insertAt(index, item);
        this._onHandlerAdded(item);
    }
    move(oldIndex, newIndex) {
        return super.move(oldIndex, newIndex);
    }
    removeAt(index) {
        const item = super.removeAt(index);
        if (item)
            this._onHandlerRemoved(item);
        return item;
    }
    clear() {
        for (let i = 0; i < this.length; i++) {
            this.getItem(i).layer = null;
        }
        super.clear();
    }
    _onHandlerAdded(handler) {
        this._applyLayerAndCanvas(handler);
    }
    _onHandlerRemoved(handler) {
        const canvas = this._layer.canvas;
        if (canvas && canvas.isItemHandlerSelected(handler))
            canvas.removeSelectedItemHandler(handler);
        handler.layer = null;
        //tell to handler is has been removed from canvas
        if (canvas)
            handler.canvas = null;
    }
}
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