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export type OnFrameFn = (frame: number) => void;
export type OnFinishFn = () => void;
export interface IKeyframeAnimationOptions {
start?: number;
end: number;
}
export type KeyframeAnimationRange = [number, number];
export default class KeyframeAnimation {
private speedValue = 200; // ms
private onFrameValue?: OnFrameFn;
private onFinishValue?: OnFinishFn;
private currentFrameValue = 0;
private targetFrame = 0;
private isRunningValue = false;
private isFinishedValue = false;
private timeout?: NodeJS.Timeout;
get currentFrame(): number {
return this.currentFrameValue;
}
// This setter is only meant to be used when running tests
// @internal
set currentFrame(newValue: number) {
if (process.env.NODE_ENV === 'test') {
this.currentFrameValue = newValue;
} else {
throw new Error('The setter for currentFrame is only available in test environment.');
}
}
set onFrame(newValue: OnFrameFn | undefined) {
this.onFrameValue = newValue;
}
get onFrame(): OnFrameFn | undefined {
return this.onFrameValue;
}
// called when animation finished
set onFinish(newValue: OnFinishFn | undefined) {
this.onFinishValue = newValue;
}
get onFinish(): OnFinishFn | undefined {
return this.onFinishValue;
}
// pace per frame in ms
set speed(newValue: number) {
this.speedValue = newValue;
}
get speed(): number {
return this.speedValue;
}
get isRunning(): boolean {
return this.isRunningValue;
}
get isFinished(): boolean {
return this.isFinishedValue;
}
public play(options: IKeyframeAnimationOptions) {
const { start, end } = options;
if (start !== undefined) {
this.currentFrameValue = start;
}
this.targetFrame = end;
this.isRunningValue = true;
this.isFinishedValue = false;
this.unscheduleUpdate();
this.render();
this.scheduleUpdate();
}
public stop() {
this.isRunningValue = false;
this.unscheduleUpdate();
}
private unscheduleUpdate() {
if (this.timeout) {
clearTimeout(this.timeout);
this.timeout = undefined;
}
}
private scheduleUpdate() {
this.timeout = global.setTimeout(() => this.onUpdateFrame(), this.speedValue);
}
private render() {
if (this.onFrameValue) {
this.onFrameValue(this.currentFrameValue);
}
}
private didFinish() {
this.isFinishedValue = true;
this.isRunningValue = false;
if (this.onFinishValue) {
this.onFinishValue();
}
}
private onUpdateFrame() {
this.advanceFrame();
if (!this.isFinishedValue) {
this.render();
// check once again since onFrame() may stop animation
if (this.isRunningValue) {
this.scheduleUpdate();
}
}
}
private advanceFrame() {
if (this.isFinishedValue) {
return;
}
if (this.currentFrameValue === this.targetFrame) {
this.didFinish();
} else if (this.currentFrameValue < this.targetFrame) {
this.currentFrameValue += 1;
} else {
this.currentFrameValue -= 1;
}
}
}
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