bc518174
 王天杨
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// Sorted ASC by size. That's important.
// It can't be configured as it's used statically for propTypes.
export const breakpointKeys = ['xs', 'sm', 'md', 'lg', 'xl'];
const sortBreakpointsValues = values => {
const breakpointsAsArray = Object.keys(values).map(key => ({
key,
val: values[key]
})) || [];
// Sort in ascending order
breakpointsAsArray.sort((breakpoint1, breakpoint2) => breakpoint1.val - breakpoint2.val);
return breakpointsAsArray.reduce((acc, obj) => {
return {
...acc,
[obj.key]: obj.val
};
}, {});
};
// Keep in mind that @media is inclusive by the CSS specification.
export default function createBreakpoints(breakpoints) {
const {
// The breakpoint **start** at this value.
// For instance with the first breakpoint xs: [xs, sm).
values = {
xs: 0,
// phone
sm: 600,
// tablet
md: 900,
// small laptop
lg: 1200,
// desktop
xl: 1536 // large screen
},
unit = 'px',
step = 5,
...other
} = breakpoints;
const sortedValues = sortBreakpointsValues(values);
const keys = Object.keys(sortedValues);
function up(key) {
const value = typeof values[key] === 'number' ? values[key] : key;
return `@media (min-width:${value}${unit})`;
}
function down(key) {
const value = typeof values[key] === 'number' ? values[key] : key;
return `@media (max-width:${value - step / 100}${unit})`;
}
function between(start, end) {
const endIndex = keys.indexOf(end);
return `@media (min-width:${typeof values[start] === 'number' ? values[start] : start}${unit}) and ` + `(max-width:${(endIndex !== -1 && typeof values[keys[endIndex]] === 'number' ? values[keys[endIndex]] : end) - step / 100}${unit})`;
}
function only(key) {
if (keys.indexOf(key) + 1 < keys.length) {
return between(key, keys[keys.indexOf(key) + 1]);
}
return up(key);
}
function not(key) {
// handle first and last key separately, for better readability
const keyIndex = keys.indexOf(key);
if (keyIndex === 0) {
return up(keys[1]);
}
if (keyIndex === keys.length - 1) {
return down(keys[keyIndex]);
}
return between(key, keys[keys.indexOf(key) + 1]).replace('@media', '@media not all and');
}
return {
keys,
values: sortedValues,
up,
down,
between,
only,
not,
unit,
...other
};
}
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