Created
November 22, 2019 12:32
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Masonry worklet example
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| // Plan on making a react/web component that reuses the layout logic from the worklet to lay out and | |
| // reoder a css columns top down layout to a ltr flow | |
| // From https://github.com/GoogleChromeLabs/houdini-samples | |
| registerLayout( | |
| 'masonry', | |
| class { | |
| static get inputProperties() { | |
| return ['--padding', '--columns']; | |
| } | |
| *intrinsicSizes() { | |
| /* TODO implement :) */ | |
| } | |
| async layout(children, edges, constraints, styleMap) { | |
| const inlineSize = constraints.fixedInlineSize; | |
| const padding = parseInt(styleMap.get('--padding')); | |
| const columnValue = styleMap.get('--columns'); | |
| // We also accept 'auto', which will select the BEST number of columns. | |
| let columns = parseInt(columnValue); | |
| if (columnValue == 'auto' || !columns) { | |
| columns = Math.ceil(inlineSize / 350); // MAGIC NUMBER o/. | |
| } | |
| // Layout all children with simply their column size. | |
| const childInlineSize = | |
| (inlineSize - (columns + 1) * padding) / columns; | |
| /* | |
| const childFragments = await children.map((child) => { | |
| return child.layoutNextFragment({fixedInlineSize: childInlineSize}); | |
| }); | |
| */ | |
| const childFragments = []; | |
| for (let child of children) { | |
| // (2) Perform layout upon the child. | |
| const fragment = await child.layoutNextFragment({ | |
| fixedInlineSize: childInlineSize, | |
| }); | |
| childFragments.push(fragment); | |
| } | |
| let autoBlockSize = 0; | |
| const columnOffsets = Array(columns).fill(0); | |
| for (let childFragment of childFragments) { | |
| // Select the column with the least amount of stuff in it. | |
| const min = columnOffsets.reduce( | |
| (acc, val, idx) => { | |
| if (!acc || val < acc.val) { | |
| return { idx, val }; | |
| } | |
| return acc; | |
| }, | |
| { val: +Infinity, idx: -1 } | |
| ); | |
| childFragment.inlineOffset = | |
| padding + (childInlineSize + padding) * min.idx; | |
| childFragment.blockOffset = padding + min.val; | |
| columnOffsets[min.idx] = | |
| childFragment.blockOffset + childFragment.blockSize; | |
| autoBlockSize = Math.max( | |
| autoBlockSize, | |
| columnOffsets[min.idx] + padding | |
| ); | |
| } | |
| return { autoBlockSize, childFragments }; | |
| } | |
| } | |
| ); | |
| /** | |
| * Copyright 2018 Google Inc. All Rights Reserved. | |
| * Licensed under the Apache License, Version 2.0 (the "License"); | |
| * you may not use this file except in compliance with the License. | |
| * You may obtain a copy of the License at | |
| * http://www.apache.org/licenses/LICENSE-2.0 | |
| * Unless required by applicable law or agreed to in writing, software | |
| * distributed under the License is distributed on an "AS IS" BASIS, | |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| * See the License for the specific language governing permissions and | |
| * limitations under the License. | |
| */ |
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