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64 lines
1.7 KiB
64 lines
1.7 KiB
// Copyright 2019 The Flutter team. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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/// A proxy of the catalog of items the user can buy.
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///
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/// In a real app, this might be backed by a backend and cached on device.
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/// In this sample app, the catalog is procedurally generated and infinite.
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///
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/// For simplicity, the catalog is expected to be immutable (no products are
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/// expected to be added, removed or changed during the execution of the app).
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class CatalogModel {
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static List<String> itemNames = [
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'Code Smell',
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'Control Flow',
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'Interpreter',
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'Recursion',
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'Sprint',
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'Heisenbug',
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'Spaghetti',
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'Hydra Code',
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'Off-By-One',
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'Scope',
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'Callback',
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'Closure',
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'Automata',
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'Bit Shift',
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'Currying',
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];
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/// Get item by [id].
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///
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/// In this sample, the catalog is infinite, looping over [itemNames].
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Item getById(int id) => Item(id, itemNames[id % itemNames.length]);
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/// Get item by its position in the catalog.
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Item getByPosition(int position) {
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// In this simplified case, an item's position in the catalog
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// is also its id.
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return getById(position);
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}
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}
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@immutable
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class Item {
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final int id;
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final String name;
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final Color color;
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final int price = 42;
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Item(this.id, this.name)
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// To make the sample app look nicer, each item is given one of the
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// Material Design primary colors.
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: color = Colors.primaries[id % Colors.primaries.length];
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@override
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int get hashCode => id;
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@override
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bool operator ==(Object other) => other is Item && other.id == id;
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}
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