Hunlongyu opened a new issue #16738:
URL: https://github.com/apache/echarts/issues/16738
### What problem does this feature solve?
Toolbox feature: The default icon color changes to blue when clicked， but
the color of the custom icon does not change after clicking.
(toolbox feature 里默认的图标如：datazoom，brush 等，点击后颜色变蓝，但是自定义的图标点击后没有变化）
I hope that when hover or click the icon, there are attributes that can
change the icon's color or style.
(希望鼠标悬浮或者点击自定义图标的时候，可以有属性值来改变颜色或者样式。)
### What does the proposed API look like?
```js
const toolbox = {
featrure: {
myRecovery: {
show: true,
title: 'recovery'
icon: '',
hover: {
icon: {
color: '#ff0',
size: 14
},
label: {...}
},
focus: {
icon: {},
label: {}
},
onclick () {}
}
}
}
```
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