NativeScript/tests/app/animation-frame/animation-frame.ts

import * as TKUnit from "../tk-unit";
import * as animationFrame from "@nativescript/core/animation-frame";
import * as fpsNative from "@nativescript/core/fps-meter/fps-native";

export function test_requestAnimationFrame_isDefined() {
    TKUnit.assertNotEqual(animationFrame.requestAnimationFrame, undefined, "Method animationFrame.requestAnimationFrame() should be defined!");
}

export function test_cancelAnimationFrame_isDefined() {
    TKUnit.assertNotEqual(animationFrame.cancelAnimationFrame, undefined, "Method animationFrame.cancelAnimationFrame() should be defined!");
}

export function test_requestAnimationFrame() {
    let completed: boolean;

    const id = animationFrame.requestAnimationFrame(() => {
        completed = true;
    });

    TKUnit.waitUntilReady(() => completed, 0.5, false);
    animationFrame.cancelAnimationFrame(id);
    TKUnit.assert(completed, "Callback should be called!");
}

export function test_requestAnimationFrame_callbackCalledInCurrentFrame() {
    let completed: boolean;
    let currentFrameTime = 0;
    const frameCb = new fpsNative.FPSCallback((time) => {
        currentFrameTime = time;
    });
    frameCb.start();

    TKUnit.waitUntilReady(() => currentFrameTime > 0, 0.5);
    let calledTime = 0;
    animationFrame.requestAnimationFrame((frameTime) => {
        calledTime = frameTime;
        completed = calledTime >= frameTime;
    });

    TKUnit.waitUntilReady(() => completed, 0.5, false);
    frameCb.stop();
    TKUnit.assert(completed, "Callback should be called in current frame!");
}

export function test_requestAnimationFrame_nextCallbackCalledInNextFrame() {
    let completed: boolean;
    let currentFrameTime = 0;
    const frameCb = new fpsNative.FPSCallback((time) => {
        currentFrameTime = time;
    });
    frameCb.start();

    TKUnit.waitUntilReady(() => currentFrameTime > 0, 0.5);
    animationFrame.requestAnimationFrame((firstFrameTime) => {
        animationFrame.requestAnimationFrame((frameTime) => {
            frameCb.stop();
            completed = frameTime > firstFrameTime && frameTime === currentFrameTime;
        });
    });

    TKUnit.waitUntilReady(() => completed, 0.5, false);
    frameCb.stop();
    TKUnit.assert(completed, "Callback should be called in next frame!");
}

export function test_requestAnimationFrame_shouldBeCancelled() {
    let completed: boolean;
    let currentFrameTime = 0;
    const frameCb = new fpsNative.FPSCallback((time) => {
        currentFrameTime = time;
    });
    frameCb.start();

    TKUnit.waitUntilReady(() => currentFrameTime > 0, 0.5);
    animationFrame.requestAnimationFrame((firstFrameTime) => {
        const cbId = animationFrame.requestAnimationFrame((frameTime) => {
            completed = true;
        });
        animationFrame.cancelAnimationFrame(cbId);
    });

    TKUnit.wait(1);
    frameCb.stop();
    TKUnit.assert(!completed, "Callback should not be called");
}