1// Copyright (C) 2018 The Android Open Source Project 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15import * as m from 'mithril'; 16 17export interface PanelSize { 18 width: number; 19 height: number; 20} 21 22export abstract class Panel<Attrs = {}> implements m.ClassComponent<Attrs> { 23 abstract renderCanvas( 24 ctx: CanvasRenderingContext2D, size: PanelSize, 25 vnode: PanelVNode<Attrs>): void; 26 abstract view(vnode: m.CVnode<Attrs>): m.Children|null|void; 27} 28 29 30export type PanelVNode<Attrs = {}> = m.Vnode<Attrs, Panel<Attrs>>; 31 32export function isPanelVNode(vnode: m.Vnode): vnode is PanelVNode { 33 const tag = vnode.tag as {}; 34 return ( 35 typeof tag === 'function' && 'prototype' in tag && 36 tag.prototype instanceof Panel); 37} 38