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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| import { LineDrawInfo } from "../tools/LineTool" | ||
| import { EyeDropperInfo } from "../tools/EyeDropperTool" | ||
| import { DrawingEngine } from "./DrawingEngine" | ||
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| type ToolInfo = LineDrawInfo | EyeDropperInfo | ||
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| export interface HistoryState { | ||
| toolInfo: ToolInfo | ||
| imageData: string | null | ||
| } | ||
|
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| interface HistoryOptions { | ||
| maxHistory: number | ||
| } | ||
|
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| export class CanvasHistory { | ||
| protected redoHistory: Array<Readonly<HistoryState>> = [] | ||
| protected history: Array<Readonly<HistoryState>> = [] | ||
| protected hasTruncated = false | ||
|
|
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| constructor( | ||
| protected readonly engine: DrawingEngine, | ||
| protected options: HistoryOptions, | ||
| ) { | ||
| if (!options.maxHistory || options.maxHistory < 1) { | ||
| options.maxHistory = 10 | ||
| } | ||
| } | ||
|
|
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| public setOptions(options: Partial<HistoryOptions>) { | ||
| this.options = { | ||
| ...this.options, | ||
| ...options, | ||
| } | ||
| return this | ||
| } | ||
|
|
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| public getOptions(): Readonly<HistoryOptions> { | ||
| return this.options | ||
| } | ||
|
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| protected async getBlob(canvas: HTMLCanvasElement): Promise<Blob> { | ||
| return new Promise((resolve) => { | ||
| canvas.toBlob((blob) => { | ||
| if (!blob) { | ||
| throw new Error("Could not get blob from canvas") | ||
| } | ||
| resolve(blob) | ||
| }) | ||
| }) | ||
| } | ||
|
|
||
| public save(toolInfo: ToolInfo) { | ||
| const canvas = this.engine.gl.canvas | ||
| if (!(canvas instanceof HTMLCanvasElement)) { | ||
| throw new Error("Canvas is not an HTMLCanvasElement") | ||
| } | ||
| const tool = this.engine.tools[toolInfo.tool] | ||
| if (!tool) { | ||
| throw new Error(`Tool ${toolInfo.tool} not found`) | ||
| } | ||
| this.addHistory({ | ||
| toolInfo, | ||
| imageData: tool.updatesImageData ? canvas.toDataURL() : null, | ||
| }) | ||
| } | ||
|
|
||
| public async redo() { | ||
| const state = this.redoHistory.pop() | ||
| if (!state) { | ||
| return | ||
| } | ||
| this.history.push(state) | ||
| return await this.drawState(state) | ||
| } | ||
|
|
||
| public async undo() { | ||
| const state = this.history.pop() | ||
| console.log("Undoing", state) | ||
| if (!state) { | ||
| return | ||
| } | ||
| const currentState = this.history[this.history.length - 1] | ||
| this.redoHistory.push(state) | ||
| return await this.drawState(currentState) | ||
| } | ||
|
|
||
| protected addHistory(state: HistoryState) { | ||
| console.log("Adding history", state) | ||
| if (this.history.length >= this.options.maxHistory) { | ||
| this.hasTruncated = true | ||
| this.history.shift() | ||
| } | ||
| this.history.push(state) | ||
| this.redoHistory = [] | ||
| } | ||
|
|
||
| protected drawState(state: Readonly<HistoryState> | null) { | ||
| if (!state) { | ||
| if (!this.hasTruncated) this.engine.clearCanvas() | ||
| return Promise.resolve(null) | ||
| } | ||
| const { toolInfo, imageData } = state | ||
| console.log("Drawing state", state) | ||
| if (!imageData) { | ||
| return Promise.resolve(toolInfo) | ||
| } | ||
| return new Promise<HistoryState["toolInfo"]>((resolve, reject) => { | ||
| const image = new Image() | ||
| image.onload = () => { | ||
| this.engine._clear() | ||
| this.engine.loadImage(image) | ||
| resolve(toolInfo) | ||
| } | ||
| image.src = imageData | ||
| image.onerror = () => { | ||
| reject(new Error("Could not load image")) | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| public clear() { | ||
| this.history = [] | ||
| } | ||
|
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| public getHistory(): Readonly<{ undo: ReadonlyArray<HistoryState>; redo: ReadonlyArray<HistoryState> }> { | ||
| return { | ||
| undo: this.history, | ||
| redo: this.redoHistory, | ||
| } | ||
| } | ||
|
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| public canUndo() { | ||
| const minStates = this.hasTruncated ? 1 : 0 | ||
| return this.history.length > minStates | ||
| } | ||
|
|
||
| public canRedo() { | ||
| return this.redoHistory.length > 0 | ||
| } | ||
| } |
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