Implementation of CSS3 Flexbox dice layout and explanation of problem examples

This article is just to familiarize yourself with the usage of basic attributes and complete the production of each side of a set of dice. In the following content, I will not cover some of the more difficult issues with flexbox, such as old version syntax, vendor prefixes, browser quirks, etc.:

1. First Face
We know that the dice has six sides, and the number of points on each side represents the value of that side. The first side consists of a horizontally and vertically centered point. Let’s look at the specific implementation:

 <section name="01" class="face-01">   
  <span class="dot"></span>   
 </section>   
face-01 {   
display: flex;   
justify-content: center;   
align-items: center;

For the usage of justify-content and align-items, please refer to here justify-content, align-items. Using flexbox, you can do it by vertically centering two rows of attributes. It’s very easy!

2. Second Face

.face-02 {   
 display: flex;   
 justify-content: space-between;   
}   
.face-02 .dot:nth-of-type(2) {   
 align-self: flex-end;   
}   
  <section name="02" class="face-02">   
   <span class="dot"></span>   
   <span class="dot"></span>   
  </section>

We can’t use the align-items attribute here, use it both All points will be affected. Flexbox provides an align-self attribute, which allows us to more conveniently control the flex items to set different layouts along the cross axias direction. For the usage of align-self, please refer to align-self here.

3. Third Face

.face-03 {   
 display: flex;   
 justify-content: space-between;   
}   
.face-03 .dot:nth-of-type(2) {   
 align-self: center;   
}   
.face-03 .dot:nth-of-type(3) {   
 align-self: flex-end;   
}   
<section name="03" class="face-03">   
 <span class="dot"></span>   
 <span class="dot"></span>   
 <span class="dot"></span>   
</section>

This face uses the same attributes as the second face, no longer explain.

4. Fourth Face

.face-04 {   
 display: flex;   
 justify-content: space-between;   
 flex-direction: column;   
}   
.face-04 .column {   
 display: flex;   
 justify-content: space-between;   
}   
<section name="04" class="face-04">   
  <p class="column">   
    <span class="dot"></span>   
    <span class="dot"></span>   
  </p>   
  <p class="column">   
    <span class="dot"></span>   
    <span class="dot"></span>   
  </p>   
</section>

In this example, flex-direction is used, literally It can be seen that it is used to control the direction of flex, that is, layout in columns or rows. For more detailed usage of this attribute, please refer to the Fifth Face and Sixth Face behind flex-direction

, according to the previous layout. Thoughts are very easy so I won’t go into details!

Writing this, it should be easy to write a small game of playing dice with JS.

5. Achieve 1,2,3,4,6,12 equal parts

.row {   
  display: flex;   
  box-sizing: border-box;   
}   

.column {   
  margin: 10px;   
  flex-grow: 1;   
  flex-shrink: 1;   
  flex-basis: 0;   
  box-sizing: border-box;   
}   
<section class="row">   
  <p class="column">One</p>   
</section>   
<section class="row">   
  <p class="column">One Half</p>   
  <p class="column">One Half</p>   
</section>   
<section class="row">   
  <p class="column">One Third</p>   
  <p class="column">One Third</p>   
  <p class="column">One Third</p>   
</section>   
<section class="row">   
  <p class="column">One Fourth</p>   
  <p class="column">One Fourth</p>   
  <p class="column">One Fourth</p>   
  <p class="column">One Fourth</p>   
</section>   
<section class="row">   
  <p class="column">One Sixth</p>   
  <p class="column">One Sixth</p>   
  <p class="column">One Sixth</p>   
  <p class="column">One Sixth</p>   
  <p class="column">One Sixth</p>   
  <p class="column">One Sixth</p>   
</section>   
<section class="row">   
  <p class="column">One Twelve</p>   
  <p class="column">One Twelve</p>   
  <p class="column">One Twelve</p>   
  <p class="column">One Twelve</p>   
  <p class="column">One Twelve</p>   
  <p class="column">One Twelve</p>   
  <p class="column">One Twelve</p>   
  <p class="column">One Twelve</p>   
  <p class="column">One Twelve</p>   
  <p class="column">One Twelve</p>   
  <p class="column">One Twelve</p>   
  <p class="column">One Twelve</p>   
</section>

In this example, three attributes, flex-grow, flex-shrink, and flex-basis, are used.
1. flex-grow: Used to define the expansion capabilities of flex items as needed. It accepts a value without units as a ratio. It is mainly used to determine how much space should be expanded proportionally to the remaining space of the scalable container.
If the "flex-grow" of all flex items is set to "1", then each flex item will be set to an equal-sized remaining space. If you set the "flex-grow" value to "2" for one of the flex items, then the remaining space occupied by this flex item is twice the remaining space occupied by the other flex items. Negative values ​​are invalid.
2. flex-shrink: Used to define the ability to shrink flex items as needed. Negative values ​​are also invalid.
3. flex-basis: Used to set the scaling baseline value. The remaining space is scaled according to the ratio. Negative values ​​are not supported. If set to 0, additional space around the content is not taken into account. If set to auto, additional space is allocated based on the flex-grow value.

6. Implement the 2-3-7 layout

row237 .column:first-of-type {   
  flex-grow: 2;   
  flex-basis: 5px;   
}   
.row237 .column:nth-of-type(2) {   
  flex-grow: 3;   
  flex-basis: 18px;   
}   
.row237 .column:nth-of-type(3) {   
  flex-grow: 7;   
  flex-basis: 70.5px;   
}   

<section class="row row237">   
  <p class="column">One Half</p>   
  <p class="column">One Third</p>   
  <p class="column">One Seventh</p>   
</section>

##The calculation of the flex-basis values ​​here should be There is a formula (to be solved). If there is this formula, it will be very convenient to implement multi-column adaptive layout with pre-processing languages ​​​​such as sass and less.

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