方框箭头代表相应方框的背景色 [英] Box arrow to take background colour of respective box
问题描述
我将尽力解释这一点:
对于此 示例 ,我想要每个框的箭头通过仅向框添加红色,黑色,灰色类别来自动获取其相应框的背景色. 我可以轻松做到:
For this example I want the arrow of each box to take the background colour of its respective box automatically by only adding red, black, grey classes to the box. I could easily do:
.box.red {
&:before {
...
border-bottom: 1px solid $red;
}
}
.box.black {
&:before {
...
border-bottom: 1px solid $black;
}
}
.box.grey {
&:before {
...
border-bottom: 1px solid $grey;
}
}
但这意味着对于我创建的每种不同颜色,我将不得不手动更改箭头颜色.例如,如果将来我想添加一个绿色框,则必须在CSS中将其箭头颜色更改为绿色. Sass中是否有办法做到这一点,所以我不需要担心每次框背景颜色更改时都更改箭头颜色吗?
But this implies that for every different colour I create I'll have to change the arrow colour manually. If in the future I want to add a green box for example I'll have to change its arrow colour to green in the CSS. Is there a way in Sass to make it so I don't need to worry with changing the arrow colour every time the box background colour changes?
谢谢.
See DEMO
推荐答案
由于元素将具有纯色,因此可以在要旋转的位置上创建带有矩形的箭头,以实现布局,然后可以使用inherit
为背景
Since your element will have solid color you can create the arrow with a rectangle on where you apply rotation in order to achieve the layout then you can use inherit
for background
.box {
position: relative;
width: 100px;
height: 100px;
margin-bottom: 40px;
background:red;
}
.box::before {
content:"";
position:absolute;
width:30px;
height:30px;
top:100%;
left:20px;
transform:translateY(-50%) rotateX(40deg) rotate(45deg);
background:inherit;
}
.blue {
background:blue;
}
.green {
background:green;
}
<div class="box">
</div>
<div class="box blue">
</div>
<div class="box green">
</div>
您还可以依靠CSS变量,即使在很多地方都使用过该颜色,也只能更改一次.
You can also rely on CSS variable and you will be able to change the color only once even if it's used in many places.
这里是创建形状的另一种方法,您可以在其中轻松控制箭头的颜色,大小和位置:
Here is another way to create the shape where you can easily control the color, size and position of the arrow:
.box {
position: relative;
width: 100px;
height: 100px;
padding-bottom: var(--s,20px);
margin-bottom:10px;
background:
linear-gradient(to top right,transparent 49.8%,var(--c,red) 50%) var(--p,20px) 100%,
linear-gradient(to top left, transparent 49.8%,var(--c,red) 50%) calc(var(--p,20px) + var(--s,20px)) 100%,
var(--c,red) content-box;
background-size:var(--s,20px) var(--s,20px);
background-repeat:no-repeat;
}
.blue {
--c:blue;
--s:15px;
--p:40px;
}
.green {
--c:green;
--s:10px;
--p:60px;
}
<div class="box"></div>
<div class="box blue"></div>
<div class="box green"></div>
您可以轻松实现与代码相同的逻辑:
You can easily achieve the same logic to your code:
.box {
position: relative;
width: 100px;
height: 100px;
margin-bottom: 40px;
background:var(--c,green);
}
.box:before {
content: ' ';
border: solid transparent;
border-bottom: 1px solid var(--c,green);
border-width: 15px;
height: 0;
position: absolute;
transform: rotate(180deg);
width: 0;
bottom: -30px;
left: 20px;
}
.red {
--c: #f00;
}
.black {
--c: #000;
}
.grey {
--c: #aaa;
}
<div class="box red"></div>
<div class="box black"></div>
<div class="box grey"></div>
<div class="box "></div>
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