CSS：扩展a from right to left to reveal text

Question

我想设置一个固定的<div>，其中包含一个图标，当它悬停时从右向左扩展（<div>展开，而不是图标），在图标的左侧显示一段文字。图标的位置保持不变。这是一个草图，以帮助说明我想做的事情：

在悬停时更改<div>的大小没有问题，我只需添加一个宽度更大的类（包括转换为扩展设置动画）。但我对元素的定位感到困惑。我将图标和文本（在<span>内）放在单独的<div>中，并尝试使用flex安排所有内容。在扩展/悬停状态下，事情看起来应该是这样，但是一旦<div>再次缩小，包含图标和文本的两个div尝试共享剩下的小空间，因此图标被切断并且文本被压扁。

如果有人能帮助我弄清楚如何按照我希望的方式设置它，我将不胜感激。

这是迄今为止我所得到的一个jsFiddle：Button-GrowOnHover

加上代码本身：

$(document).ready(function() {
  var button = $("#myButton");

  button.mouseenter(function() {
    $(this).addClass("grow");
  });
  button.mouseleave(function() {
    $(this).removeClass("grow");
  });
});

.button-container {
  position: fixed;
  top: 5%;
  right: 5%;
  width: 100px;
  padding: 5px;
  background-color: tomato;
  display: flex;
  justify-content: space-between;
  overflow: hidden;
  transition: width 1s;
}

.button-container.grow {
  width: 300px
}

.button-text-container {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: lightblue;
}

.button-icon-container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="button-container" id="myButton">

  <div class="button-text-container">
    <span>Here comes some text.</span>
  </div>

  <div class="button-icon-container">
    <img src="https://placeholder.pics/svg/100x100/7AFFA6/000000/ICON">
  </div>

</div>

Answer 1

如果依赖flexbox order，只能使用CSS执行此操作，并且可以将宽度更改移动到文本而不是父容器：

.button-container {
  position: fixed;
  top: 5%;
  right: 5%;
  padding: 5px;
  background-color: tomato;
  display: flex;
  justify-content: space-between;
  overflow: hidden;
}


.button-text-container {
  order:-1;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: lightblue;
  white-space:nowrap; /*Keep text always one line*/
  overflow:hidden;
  width:0;
  transition: width 1s;
}

.button-icon-container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.button-icon-container:hover + .button-text-container {
  width:200px;
}

<div class="button-container" id="myButton">
  <div class="button-icon-container">
    <img src="https://placeholder.pics/svg/100x100/7AFFA6/000000/ICON">
  </div>
  
  <div class="button-text-container">
    <span>Here comes some text.</span>
  </div>
</div>

Answer 2

有更好的css选项，但如果你想用javascript做这个就行了。让需要增长的实际容器改变宽度而不是包装它的那个。

$(document).ready(function() {
  var button = $("#myButton");

  button.mouseenter(function() {
    $('.button-text-container').addClass("grow");
  });
  button.mouseleave(function() {
    $('.button-text-container').removeClass("grow");
  });
});

.button-container {
  position: fixed;
  top: 5%;
  right: 5%;
  padding: 5px;
  background-color: tomato;
  display: flex;
  justify-content: space-between;

}

.button-text-container.grow {
  width: 300px;
}

.button-text-container {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: lightblue;
  overflow: hidden;
  width: 0px;
  transition: width 1s;
}

.button-icon-container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="button-container" id="myButton">

  <div class="button-text-container">
    <span>Here comes some text.</span>
  </div>

  <div class="button-icon-container">
    <img src="https://placeholder.pics/svg/100x100/7AFFA6/000000/ICON">
  </div>

</div>