📦 refactor(scroll-out-player): replace scroll listener to intersectionOberver

This commit is contained in:
FoundTheWOUT 2021-05-04 19:33:27 +08:00
parent ad85e9fd5e
commit 7e3fa08dcd
2 changed files with 60 additions and 85 deletions

2
src/global.d.ts vendored
View File

@ -519,7 +519,7 @@ declare global {
checkInCenter: boolean,
fullscreenGiftBox: boolean,
scrollOutPlayer: boolean,
scrollOutPlayerTriggerPlace: string[],
scrollOutPlayerTriggerPlace: string,
scrollOutPlayerAutoPause: boolean,
scrollOutPlayerAutoLightOn: boolean,
}

View File

@ -1,6 +1,6 @@
let videoEl: HTMLVideoElement;
let playerWrap: HTMLElement;
let mode = '视频中间';
let observer: IntersectionObserver;
enum MODE {
TOP = '视频顶部',
@ -8,52 +8,19 @@ enum MODE {
BOT = '视频底部',
}
function getToTop(_mode: string, client: DOMRect): number {
function getToTop(_mode: string): number {
switch (_mode) {
case MODE.TOP:
return client?.top;
return 1;
case MODE.MID:
return client?.top + client?.height / 2;
return 0.5;
case MODE.BOT:
return client?.top + client?.height;
default:
return 0;
default:
return 0.5;
}
}
// run callback when video el scroll out.
let handlePlayerOut = function (_mode: string, callback?: () => void) {
const videoClient = playerWrap?.getBoundingClientRect();
if (videoClient?.top && videoClient.height) {
let toTop = getToTop(_mode, videoClient);
if (toTop <= 0) {
callback ? callback() : '';
// get ready to check when the video el came back.
window.addEventListener('scroll', onPlayerBackEvent, {
passive: true,
});
// remove out listener when got out.
window.removeEventListener('scroll', onPlayerOutEvent);
}
}
};
// run callback when video el scroll back.
let handlePlayerBack = function (_mode: string, callback?: () => void) {
const videoClient = playerWrap?.getBoundingClientRect();
if (videoClient?.top && videoClient.height) {
let toTop = getToTop(_mode, videoClient);
if (toTop >= 0) {
callback ? callback() : '';
// this will done by play listener
window.addEventListener('scroll', onPlayerOutEvent, {
passive: true,
});
window.removeEventListener('scroll', onPlayerBackEvent);
}
}
};
let lightOff = () => {};
let lightOn = () => {};
async function initLights() {
@ -76,74 +43,82 @@ async function initLights() {
lightOn = () => setLight(false);
}
function onPlayerOutEvent() {
handlePlayerOut(mode, () => {
if (settings.scrollOutPlayerAutoPause && !videoEl.paused) videoEl.pause();
// 满足条件: 自动开灯功能启用、自动关灯功能启用、没有启用自动暂停
// 补充: 当启用自动关灯与自动暂停时, 自动开灯动作由自动暂停完成
if (
settings.scrollOutPlayerAutoLightOn &&
settings.autoLightOff &&
!settings.scrollOutPlayerAutoPause
)
lightOn();
});
}
function onPlayerBackEvent() {
handlePlayerBack(mode, () => {
if (settings.scrollOutPlayerAutoPause && videoEl.paused) videoEl.play();
// 回来时自动关灯
// 满足条件: 自动开灯功能启用、自动关灯功能启用、没有启用自动暂停、视频播放中
if (
settings.scrollOutPlayerAutoLightOn &&
settings.autoLightOff &&
!settings.scrollOutPlayerAutoPause &&
!videoEl.paused
)
lightOff();
});
}
function addPlayerOutEvent() {
window.addEventListener('scroll', onPlayerOutEvent, { passive: true });
// window.addEventListener('scroll', onPlayerOutEvent, { passive: true });
observer.observe(playerWrap);
}
function removePlayerOutEvent() {
window.removeEventListener('scroll', onPlayerOutEvent);
// window.removeEventListener('scroll', onPlayerOutEvent);
observer.unobserve(playerWrap);
}
function mountListener() {
let intersectingCall = () => {
if (settings.scrollOutPlayerAutoPause && videoEl.paused) videoEl.play();
if (
settings.scrollOutPlayerAutoLightOn &&
settings.autoLightOff &&
!settings.scrollOutPlayerAutoPause &&
!videoEl.paused
)
lightOff();
};
let disIntersectingCall = () => {
if (settings.scrollOutPlayerAutoPause && !videoEl.paused) videoEl.pause();
if (
settings.scrollOutPlayerAutoLightOn &&
settings.autoLightOff &&
!settings.scrollOutPlayerAutoPause
)
lightOn();
};
let createObserver = (mode?: string) =>
new IntersectionObserver(
([e]) => {
e.isIntersecting ? intersectingCall() : disIntersectingCall();
},
{
root: document,
threshold: getToTop(mode ? mode : settings.scrollOutPlayerTriggerPlace),
}
);
function mountPlayListener() {
Observer.videoChange(async () => {
videoEl.addEventListener('play', addPlayerOutEvent);
// onPlayerOutEvent 不会在我们手动暂停视频时移除, 所以需要监听暂停.
videoEl.addEventListener('pause', removePlayerOutEvent);
// videoEl.addEventListener('pause', removePlayerOutEvent);
videoEl.addEventListener('ended', removePlayerOutEvent);
});
}
async function setup() {
(async function setup() {
await initLights();
addSettingsListener('triggerPlayerOutPlace', (value) => (mode = value));
addSettingsListener('scrollOutPlayerTriggerPlace', (value) => {
removePlayerOutEvent();
observer = createObserver(value);
addPlayerOutEvent();
console.log(observer);
});
videoEl = dq('.bilibili-player-video video') as HTMLVideoElement;
playerWrap = (dq('.player-wrap') || dq('.player-module')) as HTMLElement;
mountListener();
}
setup();
observer = createObserver();
mountPlayListener();
})();
export default {
reload: () => {
window.addEventListener('scroll', onPlayerOutEvent);
mountListener();
addPlayerOutEvent();
mountPlayListener();
},
unload: () => {
// remove all listener
Observer.videoChange(async () => {
videoEl.removeEventListener('play', addPlayerOutEvent);
// umount player listener
Observer.videoChange(async () => { videoEl.removeEventListener('play', addPlayerOutEvent);
videoEl.removeEventListener('pause', removePlayerOutEvent);
videoEl.removeEventListener('ended', removePlayerOutEvent);
});
window.removeEventListener('scroll', onPlayerOutEvent);
window.removeEventListener('scroll', onPlayerBackEvent);
removePlayerOutEvent();
},
};