| // Copyright (C) 2018 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| import {TrackState} from '../common/state'; |
| import {globals} from './globals'; |
| |
| /** |
| * This interface forces track implementations to have some static properties. |
| * Typescript does not have abstract static members, which is why this needs to |
| * be in a seperate interface. |
| */ |
| export interface TrackCreator { |
| // Store the kind explicitly as a string as opposed to using class.kind in |
| // case we ever minify our code. |
| readonly kind: string; |
| |
| // We need the |create| method because the stored value in the registry is an |
| // abstract class, and we cannot call 'new' on an abstract class. |
| create(TrackState: TrackState): Track; |
| } |
| |
| /** |
| * The abstract class that needs to be implemented by all tracks. |
| */ |
| export abstract class Track<Config = {}, Data = {}> { |
| /** |
| * Receive data published by the TrackController of this track. |
| */ |
| constructor(protected trackState: TrackState) {} |
| abstract renderCanvas(ctx: CanvasRenderingContext2D): void; |
| |
| get config(): Config { |
| return this.trackState.config as Config; |
| } |
| |
| data(): Data { |
| return globals.trackDataStore.get(this.trackState.id) as Data; |
| } |
| |
| getHeight(): number { |
| return 40; |
| } |
| |
| onMouseMove(_position: {x: number, y: number}) {} |
| |
| onMouseOut() {} |
| } |