om/node_modules/vuetify/lib/components/VTabs/VTabsItems.js

// Extensions
import VWindow from '../VWindow/VWindow';
/* @vue/component */
export default VWindow.extend({
    name: 'v-tabs-items',
    inject: {
        registerItems: {
            default: null
        },
        tabProxy: {
            default: null
        },
        unregisterItems: {
            default: null
        }
    },
    props: {
        cycle: Boolean
    },
    watch: {
        internalValue: function internalValue(val) {
            /* istanbul ignore else */
            if (this.tabProxy) this.tabProxy(val);
        }
    },
    created: function created() {
        this.registerItems && this.registerItems(this.changeModel);
    },
    beforeDestroy: function beforeDestroy() {
        this.unregisterItems && this.unregisterItems();
    },

    methods: {
        changeModel: function changeModel(val) {
            this.internalValue = val;
        },

        // For backwards compatability with v1.2
        getValue: function getValue(item, i) {
            /* istanbul ignore if */
            if (item.id) return item.id;
            return VWindow.options.methods.getValue.call(this, item, i);
        },
        next: function next() {
            if (!this.cycle && this.internalIndex === this.items.length - 1) {
                return;
            }
            VWindow.options.methods.next.call(this);
        },
        prev: function prev() {
            if (!this.cycle && this.internalIndex === 0) {
                return;
            }
            VWindow.options.methods.prev.call(this);
        }
    }
});
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