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joplin/packages/app-desktop/gui/ResizableLayout/utils/useLayoutItemSizes.ts

154 lines
5.2 KiB
TypeScript

import { useMemo } from 'react';
import { LayoutItem, Size } from './types';
const dragBarThickness = 5;
export const itemMinWidth = 40;
export const itemMinHeight = 40;
export interface LayoutItemSizes {
[key: string]: Size;
}
// Container always take the full space while the items within it need to
// accomodate for the resize handle.
export function itemSize(item: LayoutItem, parent: LayoutItem | null, sizes: LayoutItemSizes, isContainer: boolean): Size {
const parentResizableRight = !!parent && parent.resizableRight;
const parentResizableBottom = !!parent && parent.resizableBottom;
const rightGap = !isContainer && (item.resizableRight || parentResizableRight) ? dragBarThickness : 0;
const bottomGap = !isContainer && (item.resizableBottom || parentResizableBottom) ? dragBarThickness : 0;
return {
width: sizes[item.key].width - rightGap,
height: sizes[item.key].height - bottomGap,
};
}
// This calculate the size of each item within the layout. However
// the final size, as rendered by the component is determined by
// `itemSize()`, as it takes into account the resizer handle
function calculateChildrenSizes(item: LayoutItem, parent: LayoutItem | null, sizes: LayoutItemSizes, makeAllVisible: boolean): LayoutItemSizes {
if (!item.children) return sizes;
const parentSize = itemSize(item, parent, sizes, true);
const remainingSize: Size = {
width: parentSize.width,
height: parentSize.height,
};
const noWidthChildren: any[] = [];
const noHeightChildren: any[] = [];
// The minimum space required for items with no defined size
let noWidthChildrenMinWidth = 0;
let noHeightChildrenMinHeight = 0;
for (const child of item.children) {
let w = 'width' in child ? child.width : null;
let h = 'height' in child ? child.height : null;
if (!makeAllVisible && child.visible === false) {
w = 0;
h = 0;
}
sizes[child.key] = { width: w, height: h };
if (w !== null) remainingSize.width -= w;
if (h !== null) remainingSize.height -= h;
if (w === null) {
noWidthChildren.push({ item: child, parent: item });
noWidthChildrenMinWidth += child.minWidth || itemMinWidth;
}
if (h === null) {
noHeightChildren.push({ item: child, parent: item });
noHeightChildrenMinHeight += child.minHeight || itemMinHeight;
}
}
while (remainingSize.width < noWidthChildrenMinWidth) {
// There is not enough space, the widest item will be made smaller
let widestChild = item.children[0].key;
for (const child of item.children) {
if (!child.visible) continue;
if (sizes[child.key].width > sizes[widestChild].width) widestChild = child.key;
}
const dw = Math.abs(remainingSize.width - noWidthChildrenMinWidth);
sizes[widestChild].width -= dw;
remainingSize.width += dw;
}
while (remainingSize.height < noHeightChildrenMinHeight) {
// There is not enough space, the tallest item will be made smaller
let tallestChild = item.children[0].key;
for (const child of item.children) {
if (!child.visible) continue;
if (sizes[child.key].height > sizes[tallestChild].height) tallestChild = child.key;
}
const dh = Math.abs(remainingSize.height - noHeightChildrenMinHeight);
sizes[tallestChild].height -= dh;
remainingSize.height += dh;
}
if (noWidthChildren.length) {
const w = item.direction === 'row' ? Math.floor(remainingSize.width / noWidthChildren.length) : parentSize.width;
for (const child of noWidthChildren) {
const finalWidth = w;
sizes[child.item.key].width = finalWidth;
}
}
if (noHeightChildren.length) {
const h = item.direction === 'column' ? Math.floor(remainingSize.height / noHeightChildren.length) : parentSize.height;
for (const child of noHeightChildren) {
const finalHeight = h;
sizes[child.item.key].height = finalHeight;
}
}
for (const child of item.children) {
const childrenSizes = calculateChildrenSizes(child, parent, sizes, makeAllVisible);
sizes = { ...sizes, ...childrenSizes };
}
return sizes;
}
// Gives the maximum available space for this item that it can take up during resizing
// availableSize = totalSize - ( [size of items with set size, except for the current item] + [minimum size of items with no set size] )
export function calculateMaxSizeAvailableForItem(item: LayoutItem, parent: LayoutItem, sizes: LayoutItemSizes): Size {
const availableSize: Size = { ...sizes[parent.key] };
for (const sibling of parent.children) {
if (!sibling.visible) continue;
availableSize.width -= 'width' in sibling ? sizes[sibling.key].width : (sibling.minWidth || itemMinWidth);
availableSize.height -= 'height' in sibling ? sizes[sibling.key].height : (sibling.minHeight || itemMinHeight);
}
availableSize.width += sizes[item.key].width;
availableSize.height += sizes[item.key].height;
return availableSize;
}
export default function useLayoutItemSizes(layout: LayoutItem, makeAllVisible: boolean = false) {
return useMemo(() => {
let sizes: LayoutItemSizes = {};
if (!('width' in layout) || !('height' in layout)) throw new Error('width and height are required on layout root');
sizes[layout.key] = {
width: layout.width,
height: layout.height,
};
sizes = calculateChildrenSizes(layout, null, sizes, makeAllVisible);
return sizes;
}, [layout, makeAllVisible]);
}