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fix:
<MenuModal> column layout (#19)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| export { determineColumnEntries } | ||
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|
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| // A CSS-only solution doesn't seem to exist. | ||
| // - https://github.com/brillout/docpress/blob/2e41d8b9df098ff8312b02f7e9d41a202548e2b9/src/renderer/getStyleColumnLayout.ts#L4-L26 | ||
|
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| import { type NavItemAll } from '../navigation/Navigation' | ||
| import { assert, assertUsage, isBrowser } from '../utils/server' | ||
| assert(!isBrowser()) | ||
|
|
||
| type NavItemWithLength = NavItemAll & { numberOfHeadings: number | null } | ||
| function determineColumnEntries(navItems: NavItemAll[]): undefined { | ||
| const navItemsWithLength: NavItemWithLength[] = navItems.map((navItem) => ({ | ||
| ...navItem, | ||
| numberOfHeadings: navItem.level === 1 || navItem.level === 4 ? 0 : null, | ||
| })) | ||
| let navItemLevel1: NavItemWithLength | undefined | ||
| let navItemLevel4: NavItemWithLength | undefined | ||
| navItemsWithLength.forEach((navItem) => { | ||
| if (navItem.level === 1) { | ||
| navItemLevel1 = navItem | ||
| navItemLevel4 = undefined | ||
| return | ||
| } | ||
| if (navItem.level === 4) { | ||
| navItemLevel4 = navItem | ||
| return | ||
| } | ||
| const bumpNavItemLength = (navItem: NavItemWithLength) => { | ||
| assert(navItem.numberOfHeadings !== null) | ||
| navItem.numberOfHeadings++ | ||
| } | ||
| assert(navItemLevel1) | ||
| bumpNavItemLength(navItemLevel1) | ||
| if (navItemLevel4) { | ||
| bumpNavItemLength(navItemLevel4) | ||
| } | ||
| }) | ||
|
|
||
| type ColumnEntry = { navItemLeader: NavItemAll; numberOfEntries: number } | ||
| const columnLayouts: ColumnEntry[][] = [] | ||
| let columnEntries: ColumnEntry[] = [] | ||
| let isFullWidth: boolean | undefined | ||
| navItemsWithLength.forEach((navItem, i) => { | ||
| let isFullWidthBegin = false | ||
| if (navItem.level === 1) { | ||
| const isFullWidthPrevious = isFullWidth | ||
| isFullWidth = !!navItem.menuModalFullWidth | ||
| if (isFullWidth) isFullWidthBegin = true | ||
| if (isFullWidthPrevious !== undefined && isFullWidthPrevious !== isFullWidth) { | ||
| columnLayouts.push(columnEntries) | ||
| columnEntries = [] | ||
| } | ||
| } | ||
| const navItemPrevious = navItemsWithLength[i - 1] | ||
| const navItemNext = navItemsWithLength[i + 1] | ||
| if ( | ||
| !isFullWidth ? navItem.level === 1 : (navItem.level === 4 && navItemPrevious!.level !== 1) || isFullWidthBegin | ||
| ) { | ||
| if (isFullWidth) { | ||
| assert(navItem.level === 4 || (navItem.level === 1 && isFullWidthBegin)) | ||
| } else { | ||
| assert(navItem.level === 1) | ||
| } | ||
| let { numberOfHeadings } = navItem | ||
| assert(numberOfHeadings !== null) | ||
| if (isFullWidthBegin) { | ||
| assert(navItem.level === 1) | ||
| assertUsage( | ||
| navItemNext && navItemNext.level === 4, | ||
| // We can lift this requirement, but it isn't trivial to implement. | ||
| 'level-1 headings with menuModalFullWidth need to be followed by a level-4 heading', | ||
| ) | ||
| assert(navItemNext.numberOfHeadings) | ||
| numberOfHeadings = navItemNext.numberOfHeadings | ||
| } | ||
| columnEntries.push({ navItemLeader: navItems[i], numberOfEntries: numberOfHeadings }) | ||
| } | ||
| }) | ||
| assert(columnEntries!) | ||
| columnLayouts.push(columnEntries) | ||
|
|
||
| columnLayouts.forEach((columnEntries) => { | ||
| for (let numberOfColumns = columnEntries.length; numberOfColumns >= 1; numberOfColumns--) { | ||
| const columnsIdMap = determineColumns( | ||
| columnEntries.map((columnEntry) => columnEntry.numberOfEntries), | ||
| numberOfColumns, | ||
| ) | ||
| columnEntries.forEach((columnEntry, i) => { | ||
| columnEntry.navItemLeader.isColumnEntry ??= {} | ||
| columnEntry.navItemLeader.isColumnEntry[numberOfColumns] = columnsIdMap[i] | ||
| }) | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| function determineColumns(columnsUnmerged: number[], numberOfColumns: number): number[] { | ||
| assert(numberOfColumns <= columnsUnmerged.length) | ||
| const columnsMergingInit: ColumnMerging[] = columnsUnmerged.map((columnHeight, i) => ({ | ||
| columnIdsMerged: [i], | ||
| heightTotal: columnHeight, | ||
| })) | ||
| const columnsMerged = mergeColumns(columnsMergingInit, numberOfColumns) | ||
| const columnsIdMap: number[] = new Array(columnsUnmerged.length) | ||
| assert(columnsMerged.length === numberOfColumns) | ||
| columnsMerged.forEach((columnMerged, columnMergedId) => { | ||
| columnMerged.columnIdsMerged.forEach((columnId) => { | ||
| columnsIdMap[columnId] = columnMergedId | ||
| }) | ||
| }) | ||
| assert(columnsIdMap.length === columnsUnmerged.length) | ||
|
|
||
| return columnsIdMap | ||
| } | ||
| type ColumnMerging = { columnIdsMerged: number[]; heightTotal: number } | ||
| function mergeColumns(columnsMerging: ColumnMerging[], numberOfColumns: number): ColumnMerging[] { | ||
| if (columnsMerging.length <= numberOfColumns) return columnsMerging | ||
|
|
||
| let mergeCandidate: null | (ColumnMerging & { i: number }) = null | ||
| for (let i = 0; i <= columnsMerging.length - 2; i++) { | ||
| const column1 = columnsMerging[i + 0] | ||
| const column2 = columnsMerging[i + 1] | ||
| const heightTotal = column1.heightTotal + column2.heightTotal | ||
| if (!mergeCandidate || mergeCandidate.heightTotal > heightTotal) { | ||
| mergeCandidate = { | ||
| i, | ||
| columnIdsMerged: [ | ||
| // | ||
| ...column1.columnIdsMerged, | ||
| ...column2.columnIdsMerged, | ||
| ], | ||
| heightTotal, | ||
| } | ||
| } | ||
| } | ||
| assert(mergeCandidate) | ||
|
|
||
| const { i } = mergeCandidate | ||
| assert(-1 < i && i < columnsMerging.length - 1) | ||
| const columnsMergingMod = [ | ||
| // | ||
| ...columnsMerging.slice(0, i), | ||
| mergeCandidate, | ||
| ...columnsMerging.slice(i + 2), | ||
| ] | ||
|
|
||
| assert(columnsMergingMod.length === columnsMerging.length - 1) | ||
| return mergeColumns(columnsMergingMod, numberOfColumns) | ||
| } |
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