88 lines
3.4 KiB
Plaintext
88 lines
3.4 KiB
Plaintext
// @flow
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import {cloneLayout, compact, correctBounds} from './utils';
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import type {CompactType, Layout} from './utils';
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export type ResponsiveLayout = {lg?: Layout, md?: Layout, sm?: Layout, xs?: Layout, xxs?: Layout};
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type Breakpoint = string;
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type Breakpoints = {lg?: number, md?: number, sm?: number, xs?: number, xxs?: number};
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/**
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* Given a width, find the highest breakpoint that matches is valid for it (width > breakpoint).
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*
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* @param {Object} breakpoints Breakpoints object (e.g. {lg: 1200, md: 960, ...})
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* @param {Number} width Screen width.
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* @return {String} Highest breakpoint that is less than width.
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*/
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export function getBreakpointFromWidth(breakpoints: Breakpoints, width: number): Breakpoint {
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const sorted = sortBreakpoints(breakpoints);
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let matching = sorted[0];
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for (let i = 1, len = sorted.length; i < len; i++) {
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const breakpointName = sorted[i];
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if (width > breakpoints[breakpointName]) matching = breakpointName;
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}
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return matching;
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}
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/**
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* Given a breakpoint, get the # of cols set for it.
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* @param {String} breakpoint Breakpoint name.
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* @param {Object} cols Map of breakpoints to cols.
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* @return {Number} Number of cols.
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*/
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export function getColsFromBreakpoint(breakpoint: Breakpoint, cols: Breakpoints): number {
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if (!cols[breakpoint]) {
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throw new Error("ResponsiveReactGridLayout: `cols` entry for breakpoint " + breakpoint + " is missing!");
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}
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return cols[breakpoint];
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}
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/**
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* Given existing layouts and a new breakpoint, find or generate a new layout.
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*
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* This finds the layout above the new one and generates from it, if it exists.
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*
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* @param {Object} layouts Existing layouts.
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* @param {Array} breakpoints All breakpoints.
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* @param {String} breakpoint New breakpoint.
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* @param {String} breakpoint Last breakpoint (for fallback).
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* @param {Number} cols Column count at new breakpoint.
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* @param {Boolean} verticalCompact Whether or not to compact the layout
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* vertically.
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* @return {Array} New layout.
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*/
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export function findOrGenerateResponsiveLayout(layouts: ResponsiveLayout, breakpoints: Breakpoints,
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breakpoint: Breakpoint, lastBreakpoint: Breakpoint,
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cols: number, compactType: CompactType): Layout {
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// If it already exists, just return it.
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if (layouts[breakpoint]) return cloneLayout(layouts[breakpoint]);
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// Find or generate the next layout
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let layout = layouts[lastBreakpoint];
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const breakpointsSorted = sortBreakpoints(breakpoints);
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const breakpointsAbove = breakpointsSorted.slice(breakpointsSorted.indexOf(breakpoint));
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for (let i = 0, len = breakpointsAbove.length; i < len; i++) {
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const b = breakpointsAbove[i];
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if (layouts[b]) {
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layout = layouts[b];
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break;
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}
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}
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layout = cloneLayout(layout || []); // clone layout so we don't modify existing items
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return compact(correctBounds(layout, {cols: cols}), compactType, cols);
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}
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/**
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* Given breakpoints, return an array of breakpoints sorted by width. This is usually
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* e.g. ['xxs', 'xs', 'sm', ...]
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*
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* @param {Object} breakpoints Key/value pair of breakpoint names to widths.
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* @return {Array} Sorted breakpoints.
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*/
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export function sortBreakpoints(breakpoints: Breakpoints): Array<Breakpoint> {
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const keys: Array<string> = Object.keys(breakpoints);
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return keys.sort(function(a, b) {
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return breakpoints[a] - breakpoints[b];
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});
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}
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