video标签下触摸坐标归一化

# 基本知识

# 触摸点位置

clientX / clientY：// 触摸点相对于浏览器窗口viewport的位置参照点会随着浏览器的滚动而变化
pageX / pageY：// 触摸点相对于页面的位置参照点不会随着浏览器的滚动而变化
screenX /screenY：// 触摸点相对于屏幕的位置

所以如果要算鼠标在当前div的相对位置

通过获取var offset = $("#mainScreen").offset();后

当前鼠标的绝对位置要用 pageX/Y 去拿否则浏览器页面滚动后会少算一段

# 触摸事件

# PC

onmousemove	script	当鼠标指针移动到元素上时触发。
onmouseout	script	当鼠标指针移出元素时触发。
onmouseup 属性在松开鼠标按钮时触发。
提示：相对于 onmouseup 事件的事件次序（限于鼠标左/中键）：
onmousedown
onmouseup
onclick
onmouseup 事件的事件次序（限于鼠标右键）：
onmousedown
onmouseup
oncontextmenu
onMouseover和onMousemove有什么区别?
区别是进入后onmousemove鼠标每动一下都会执行事件，onmouseover只在鼠标进入时执行一次

# Mobile

基本事件如下，其他的都是对这些事件的组合封装

mainScreen.addEventListener("touchmove", touchMove, false);//手指在屏幕上移动时触发[不动但停留太久也会触发]
mainScreen.addEventListener("touchstart", touchStart, false);//手指一触摸屏幕就触发
mainScreen.addEventListener("touchend", touchEnd, false);//手指离开屏幕触发

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# 全屏

# 进入全屏

function launchFullScreen (element) {
  if (element.requestFullscreen) {
    element.requestFullscreen();
  } else if (element.mozRequestFullScreen) {
    element.mozRequestFullScreen();
  } else if (element.webkitRequestFullscreen) {
    element.webkitRequestFullscreen();
  } else if (element.msRequestFullscreen) {
    element.msRequestFullscreen();
  }
}

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# 退出全屏

function cancelFullScreen () {
  if (document.cancelFullScreen) {
    document.cancelFullScreen();
  } else if (document.mozCancelFullScreen) {
    document.mozCancelFullScreen();
  } else if (document.webkitCancelFullScreen) {
    document.webkitCancelFullScreen();
  }
}

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# 判断是否全屏

//反射調用
var invokeFieldOrMethod = function (element, method) {
  var usablePrefixMethod;
  ["webkit", "moz", "ms", "o", ""].forEach(function (prefix) {
    if (usablePrefixMethod) return;
    if (prefix === "") {
      // 无前缀，方法首字母小写
      method = method.slice(0, 1).toLowerCase() + method.slice(1);
    }
    var typePrefixMethod = typeof element[prefix + method];
    if (typePrefixMethod + "" !== "undefined") {
      if (typePrefixMethod === "function") {
        usablePrefixMethod = element[prefix + method]();
      } else {
        usablePrefixMethod = element[prefix + method];
      }
    }
  });

  return usablePrefixMethod;
}
//判断是否是全屏
function isFullScreen () {
  return invokeFieldOrMethod(document, 'FullScreen') || invokeFieldOrMethod(document, 'IsFullScreen') || document.IsFullScreen;
}

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# 监听手机横竖屏状态

var mOrientation = 0;
$(window).on("orientationchange", function () {
  mOrientation = window.orientation;
  if (window.orientation == 0) // Portrait
  {
    console.log("竖屏状态");
  } else // Landscape
  {
    console.log("横屏状态");
  }
});

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# 竖屏0 横屏 90（正常横放） -90 （手机顶部在右侧）

# CSS3旋转元素

.trans90 {
  /* Rotate div */
  transform: rotate(9deg);
  -ms-transform: rotate(90deg);
  /* Internet Explorer */
  -moz-transform: rotate(90deg);
  /* Firefox */
  -webkit-transform: rotate(90deg);
  /* Safari 和 Chrome */
  -o-transform: rotate(90deg);
  /* Opera */
}

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function transfVideo () {
  $("#remoteVideo").addClass("trans90");
}

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# 注意：全屏状态下元素的旋转效果无效

# video元素

<video id="remoteVideo" autoplay width="100%" height="100%">
	<p>您的浏览器不支持该标签</p>
</video>

# 属性详解

autoplay ：自动播放
width="100%" height="100%" ：设置元素的宽高，非源数据的宽高

不指定controls 属性，则不会显示默认的播放，进度条等样式,但是全屏时又会显示，怎么去掉？

参考https://segmentfault.com/a/1190000000380064 (opens new window)

/*伪元素，设置全屏时不显示控件*/
video::-webkit-media-controls-enclosure {
  display: none;
}
video::-moz-media-controls-enclosure {
  display: none;
}
video::media-controls-enclosure {
  display: none;
}

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videoWidth,videoHeight属性:指的是视频源数据，不会改变，也不能修改。
width,height属性：video容器大小，当其值设置的与视频源数据不同时，会将视频源数据进行一定比例(videoWidth,videoHeight的比例)的缩放，使得视频数据尽量充满video容器

# body在移动端显示时左侧会留出一定宽度的竖条，设置100%页没有用

移动端会留与滚动条有关，改margin就行

body {
  width: 100%;
  height: 100%;
  margin: 0px;
  background-color: white;
}

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# Touch事件捕获

# 基本方法

function touchMove(event) {
  event.preventDefault();
  if(!event.touches.length) return;
  var touch = event.touches[0];
  sendTouchEvent(touch, "TOUCH_MOVE");
};

function touchStart(event) {
  event.preventDefault();
  if(!event.touches.length) return;
  var touch = event.touches[0];
  sendTouchEvent(touch, "TOUCH_START");

};

function touchEnd() {
  console.log("type:end");
}

mainScreen.addEventListener("touchmove", touchMove, false);
mainScreen.addEventListener("touchstart", touchStart, false);
mainScreen.addEventListener("touchend", touchEnd, false);

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# 屏幕分辨率

console.log(" 屏幕分辨率的高：" + window.screen.height + "\n" + " 屏幕分辨率的宽：" + window.screen.width + "\n")

# 横屏下 `window.screen.width` 得到的手机的高度的那个分辨率而不是宽度

# 发送touch事件方法——sendTouchEvent

如果要考虑完全的话，需要考虑12种情况

3种屏幕方向*是否全屏2种情况*源数据横竖屏情况(宽高比)2种情况=12

# 为什么考虑源数据横竖屏情况？

进行坐标映射、归一化的时候你就知道了

是否全屏下，video都要自动充满屏幕(videoWidth:videoHeight不变)

其video容器的宽度要保持和window.screen.width一致

代码如下目前只考虑以下6种情况，其他情况为非法操作

竖屏*是否全屏(2种)*源数据横竖屏(2种)
横屏(90和-90两种情况)*全屏*源数据横屏

function sendTouchEvent (touch, eventType) {
  //videoWidth、videoHeight、width和height的大小切屏不会改变大小
  //暂不考虑非全屏时横屏坐标 0 90（正常横放） -90 （机顶在右侧）
  //全屏模式下 touch.pageX/Y 不用参考offset
  trace(mOrientation);
  var remoteVideo = document.getElementById("remoteVideo");
  //暂不考虑videoWidth>videoHeight时mOrientation == 0的全屏情况
  if (mOrientation == 0) {
    var currentWidth = remoteVideo.width;
    var currentHeight = (remoteVideo.width / remoteVideo.videoWidth * remoteVideo.videoHeight);
    //						trace("当前总宽度" + currentWidth + "当前总高度:" + currentHeight);
    var relativeX = (touch.pageX - offset.left);
    var relativeY = (touch.pageY - offset.top);
    //判断是否为全屏 全屏下位置为 touch.pageY-(window.screen.height-currentWidth)/2
    var posX = relativeX;
    if (isFullScreen()) {
      //全屏情况下要考虑videoWidth>videoHeigh
      if (remoteVideo.videoWidth <= remoteVideo.videoHeight) {
        //console.log("touch.pageY:"+touch.pageY+" window.screen.height:"+window.screen.height+" remoteVideo.videoHeight:"+remoteVideo.videoHeight+" relativeY:"+relativeY);
        var posY = (touch.pageY - (window.screen.height - currentHeight) / 2);
        //console.log("x:" + relativeX + " y:" + posY+ " type:"+eventType+" full");
        var floatX = posX < 0 ? 0 : (posX > currentWidth ? 1 : posX / currentWidth);
        var floatY = posY < 0 ? 0 : (posY > currentHeight ? 1 : posY / currentHeight);
        console.log("发送结果：横坐标：" + floatX + " 纵坐标" + floatY + "类型:" + eventType);
        trace("发送结果：横坐标：" + floatX + " 纵坐标" + floatY + "类型:" + eventType);
      } else {
        var posY = relativeX;
        var posX = currentHeight - (touch.pageY - (window.screen.height - currentHeight) / 2);
        var floatX = posX < 0 ? 0 : (posX > currentHeight ? 1 : posX / currentHeight);
        var floatY = posY < 0 ? 0 : (posY > currentWidth ? 1 : posY / currentWidth);
        console.log("发送结果：横坐标：" + floatX + " 纵坐标" + floatY + "类型:" + eventType);
        trace("发送结果：横坐标：" + floatX + " 纵坐标" + floatY + "类型:" + eventType);
      }
    } else {
      //console.log("x:" + relativeX + " y:" + relativeY + " type:"+eventType+" nofull");
      if (remoteVideo.videoWidth <= remoteVideo.videoHeight) {
        var posY = relativeY;
        var floatX = posX < 0 ? 0 : (posX > currentWidth ? 1 : posX / currentWidth);
        var floatY = posY < 0 ? 0 : (posY > currentHeight ? 1 : posY / currentHeight);
        console.log("发送结果：横坐标：" + floatX + " 纵坐标" + floatY + "类型:" + eventType);
        trace("发送结果：横坐标：" + floatX + " 纵坐标" + floatY + "类型:" + eventType);
      } else {
        var posY = relativeX;
        var posX = currentHeight - relativeY;
        var floatX = posX < 0 ? 0 : (posX > currentHeight ? 1 : posX / currentHeight);
        var floatY = posY < 0 ? 0 : (posY > currentWidth ? 1 : posY / currentWidth);
        console.log("发送结果：横坐标：" + floatX + " 纵坐标" + floatY + "类型:" + eventType);
        trace("发送结果：横坐标：" + floatX + " 纵坐标" + floatY + "类型:" + eventType);
      }

    }

  } else if (mOrientation == 90) {
    //目前只考虑全屏的情况
    //width和height说法还是和手机保持一致 不受影响
    //videoWidth、videoHeight、width和height的大小与横屏时保持一致 640 480
    var currentWidth = remoteVideo.width;
    var currentHeight = (remoteVideo.videoWidth / remoteVideo.videoHeight) * remoteVideo.width;
    //						trace("当前总宽度" + currentWidth + "当前总高度:" + currentHeight);//360 480
    //						trace("touch.pageX:"+touch.pageX+" touch.pageY:"+touch.pageY);
    var posX = currentWidth - touch.pageY;
    //横屏下 window.screen.width得到的 手机的高度的那个分辨率而不是宽度
    var posY = touch.pageX - (window.screen.width - currentHeight) / 2;
    //还得考虑videoHeight>videoWidth，非全屏的情况 这边不写了
    if (isFullScreen()) {
      //							trace("posX:"+posX+" posY"+posY);
      //							trace("touch.pageX:"+touch.pageX+" window.screen.width:"+window.screen.width+" currentHeight:"+currentHeight);
      var floatX = posX < 0 ? 0 : (posX > currentWidth ? 1 : posX / currentWidth);
      var floatY = posY < 0 ? 0 : (posY > currentHeight ? 1 : posY / currentHeight);
      console.log("发送结果：横坐标：" + floatX + " 纵坐标" + floatY + "类型:" + eventType);
      trace("发送结果：横坐标：" + floatX + " 纵坐标" + floatY + "类型:" + eventType);
    }
  } else if (mOrientation == -90) {
    var currentWidth = remoteVideo.width;
    var currentHeight = (remoteVideo.videoWidth / remoteVideo.videoHeight) * remoteVideo.width;
    var posX = currentWidth - touch.pageY;
    //需要window.screen.width去减
    var posY = touch.pageX - (window.screen.width - currentHeight) / 2;
    //还得考虑videoHeight>videoWidth的情况 这边不写了
    if (isFullScreen()) {
      //							trace("posX:"+posX+" posY"+posY);
      //							trace("touch.pageX:"+touch.pageX+" window.screen.width:"+window.screen.width+" currentHeight:"+currentHeight);
      var floatX = posX < 0 ? 0 : (posX > currentWidth ? 1 : posX / currentWidth);
      var floatY = posY < 0 ? 0 : (posY > currentHeight ? 1 : posY / currentHeight);
      console.log("发送结果：横坐标：" + floatX + " 纵坐标" + floatY + "类型:" + eventType);
      trace("发送结果：横坐标：" + floatX + " 纵坐标" + floatY + "类型:" + eventType);
    }
  }

}

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编辑

#多点触控 #HTML

上次更新: 2024/09/01, 23:56:56

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