缩放视频以适应Flexbox项目,同时保持纵横比

Question

我正在尝试使用flexbox来布局我的网站.该网站的屏幕顶部有一个视频,下面有可滚动的div.每个柔性项目应使用屏幕高度的50%.

调整屏幕大小时,视频应保持其纵横比.宽度不应超过屏幕宽度,高度不应超过屏幕高度的50%.

现在,当屏幕很窄时,视频会正确缩放以适应宽度:

当屏幕加宽时,视频的高度超出父div的高度,控件显示在可滚动div的上方.

在保持纵横比的同时,如何确保视频永远不会超过柔性物品的高度或宽度？我的一个要求是我必须将视频元素嵌套在flex项中(我不能将视频元素用作flex项).另外,理想情况下,视频应垂直和水平居中.

html,
body {
  height: 100%;
}
video {
  width: 100%;
  height: auto;
}
.flex-container {
  height: 100%;
  display: flex;
  flex-direction: column;
}
.flex-item {
  padding: 1em;
  width: 100%;
  flex-basis: 50%;
}
.video-content {
  background-color: #ccffcc;
}
.scrollable-content {
  overflow-y: auto;
  background-color: #ffcccc;
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<div class="flex-container">
  <div class="flex-item video-content">
    <video src="http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_1mb.mp4" controls></video>
  </div>
  <div class="flex-item scrollable-content">
    Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
  </div>
</div>

Answer 1

我发现了一个适合我的解决方案.我添加position: relative;到.video-content造video绝对定位,100%的高度和宽度:

video {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
}

https://jsfiddle.net/beeps10/0hxze25p/

Answer 2

html

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<div class="flex-container">
  <div class="flex-item video-content">
    <video src="http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_1mb.mp4" controls></video>
  </div>
  <div class="flex-item scrollable-content">
    <h1>Scroll content</h1>
    <p>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
    <br>Scroll content
      <br>Scroll content</p>
  </div>
</div>

CSS

html,
body {
  height: 100vh;
}
video {
  flex:0 1 100%;
  object-fit: fill; /* over-ride "object-fit: contain" only for webkit as it doesn't honour the ratio */
}
.flex-container {
  height: 100vh;
  display: flex;
  flex-direction:column;
  justify-content:flex-start;
}
.flex-item {
  padding: 1em;
  box-sizing:border-box;
  height:auto;
}
.video-content {
  background-color: #ccffcc;
  flex:0 1 100%;
  height:50%;
  display:flex;
  justify-content:flex-start;
}
.scrollable-content {
  flex:0 0 100%;
  overflow-y: scroll;
  min-height:50vh;
  background-color: #ffcccc;
}

http://codepen.io/anon/pen/wMrYOK

https://css-tricks.com/almanac/properties/o/object-fit/

https://css-tricks.com/snippets/css/a-guide-to-flexbox/