feat: implement masonry layout with responsive columns and memo height tracking

This commit is contained in:
Steven 2025-10-14 19:46:09 +08:00
parent 3245613a88
commit 435cc7b177
13 changed files with 505 additions and 168 deletions

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@ -0,0 +1,43 @@
import { MasonryItem } from "./MasonryItem";
import { MasonryColumnProps } from "./types";
/**
* Column component for masonry layout
*
* Responsibilities:
* - Render a single column in the masonry grid
* - Display prefix element in the first column (e.g., memo editor)
* - Render all assigned memo items in order
* - Pass render context to items (includes compact mode flag)
*/
export function MasonryColumn({
memoIndices,
memoList,
renderer,
renderContext,
onHeightChange,
isFirstColumn,
prefixElement,
prefixElementRef,
}: MasonryColumnProps) {
return (
<div className="min-w-0 mx-auto w-full max-w-2xl">
{/* Prefix element (like memo editor) goes in first column */}
{isFirstColumn && prefixElement && <div ref={prefixElementRef}>{prefixElement}</div>}
{/* Render all memos assigned to this column */}
{memoIndices?.map((memoIndex) => {
const memo = memoList[memoIndex];
return memo ? (
<MasonryItem
key={`${memo.name}-${memo.displayTime}`}
memo={memo}
renderer={renderer}
renderContext={renderContext}
onHeightChange={onHeightChange}
/>
) : null;
})}
</div>
);
}

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@ -0,0 +1,45 @@
import { useEffect, useRef } from "react";
import { MasonryItemProps } from "./types";
/**
* Individual item wrapper component for masonry layout
*
* Responsibilities:
* - Render the memo using the provided renderer with context
* - Measure its own height using ResizeObserver
* - Report height changes to parent for redistribution
*
* The ResizeObserver automatically tracks dynamic content changes such as:
* - Images loading
* - Expanded/collapsed text
* - Any other content size changes
*/
export function MasonryItem({ memo, renderer, renderContext, onHeightChange }: MasonryItemProps) {
const itemRef = useRef<HTMLDivElement>(null);
const resizeObserverRef = useRef<ResizeObserver | null>(null);
useEffect(() => {
if (!itemRef.current) return;
const measureHeight = () => {
if (itemRef.current) {
const height = itemRef.current.offsetHeight;
onHeightChange(memo.name, height);
}
};
// Initial measurement
measureHeight();
// Set up ResizeObserver to track dynamic content changes
resizeObserverRef.current = new ResizeObserver(measureHeight);
resizeObserverRef.current.observe(itemRef.current);
// Cleanup on unmount
return () => {
resizeObserverRef.current?.disconnect();
};
}, [memo.name, onHeightChange]);
return <div ref={itemRef}>{renderer(memo, renderContext)}</div>;
}

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@ -1,156 +1,42 @@
import { useCallback, useEffect, useRef, useState } from "react";
import { useMemo, useRef } from "react";
import { cn } from "@/lib/utils";
import { Memo } from "@/types/proto/api/v1/memo_service";
interface Props {
memoList: Memo[];
renderer: (memo: Memo) => JSX.Element;
prefixElement?: JSX.Element;
listMode?: boolean;
}
interface MemoItemProps {
memo: Memo;
renderer: (memo: Memo) => JSX.Element;
onHeightChange: (memoName: string, height: number) => void;
}
// Minimum width required to show more than one column
const MINIMUM_MEMO_VIEWPORT_WIDTH = 512;
const MemoItem = ({ memo, renderer, onHeightChange }: MemoItemProps) => {
const itemRef = useRef<HTMLDivElement>(null);
const resizeObserverRef = useRef<ResizeObserver | null>(null);
useEffect(() => {
if (!itemRef.current) return;
const measureHeight = () => {
if (itemRef.current) {
const height = itemRef.current.offsetHeight;
onHeightChange(memo.name, height);
}
};
measureHeight();
// Set up ResizeObserver to track dynamic content changes (images, expanded text, etc.)
resizeObserverRef.current = new ResizeObserver(measureHeight);
resizeObserverRef.current.observe(itemRef.current);
return () => {
resizeObserverRef.current?.disconnect();
};
}, [memo.name, onHeightChange]);
return <div ref={itemRef}>{renderer(memo)}</div>;
};
import { MasonryColumn } from "./MasonryColumn";
import { MasonryViewProps, MemoRenderContext } from "./types";
import { useMasonryLayout } from "./useMasonryLayout";
/**
* Algorithm to distribute memos into columns based on height for balanced layout
* Uses greedy approach: always place next memo in the shortest column
* Masonry layout component for displaying memos in a balanced, multi-column grid
*
* Features:
* - Responsive column count based on viewport width
* - Longest Processing-Time First (LPT) algorithm for optimal distribution
* - Pins editor and first memo to first column for stability
* - Debounced redistribution for performance
* - Automatic height tracking with ResizeObserver
* - Auto-enables compact mode in multi-column layouts
*
* The layout automatically adjusts to:
* - Window resizing
* - Content changes (images loading, text expansion)
* - Dynamic memo additions/removals
*
* Algorithm guarantee: Layout is never more than 34% longer than optimal (proven)
*/
const distributeMemosToColumns = (
memos: Memo[],
columns: number,
itemHeights: Map<string, number>,
prefixElementHeight: number = 0,
): { distribution: number[][]; columnHeights: number[] } => {
// List mode: all memos in single column
if (columns === 1) {
const totalHeight = memos.reduce((sum, memo) => sum + (itemHeights.get(memo.name) || 0), prefixElementHeight);
return {
distribution: [Array.from({ length: memos.length }, (_, i) => i)],
columnHeights: [totalHeight],
};
}
// Initialize columns and heights
const distribution: number[][] = Array.from({ length: columns }, () => []);
const columnHeights: number[] = Array(columns).fill(0);
// Add prefix element height to first column
if (prefixElementHeight > 0) {
columnHeights[0] = prefixElementHeight;
}
// Distribute each memo to the shortest column
memos.forEach((memo, index) => {
const height = itemHeights.get(memo.name) || 0;
// Find column with minimum height
const shortestColumnIndex = columnHeights.indexOf(Math.min(...columnHeights));
distribution[shortestColumnIndex].push(index);
columnHeights[shortestColumnIndex] += height;
});
return { distribution, columnHeights };
};
const MasonryView = (props: Props) => {
const [columns, setColumns] = useState(1);
const [itemHeights, setItemHeights] = useState<Map<string, number>>(new Map());
const [distribution, setDistribution] = useState<number[][]>([[]]);
const MasonryView = ({ memoList, renderer, prefixElement, listMode = false }: MasonryViewProps) => {
const containerRef = useRef<HTMLDivElement>(null);
const prefixElementRef = useRef<HTMLDivElement>(null);
// Calculate optimal number of columns based on container width
const calculateColumns = useCallback(() => {
if (!containerRef.current || props.listMode) return 1;
const { columns, distribution, handleHeightChange } = useMasonryLayout(memoList, listMode, containerRef, prefixElementRef);
const containerWidth = containerRef.current.offsetWidth;
const scale = containerWidth / MINIMUM_MEMO_VIEWPORT_WIDTH;
return scale >= 2 ? Math.round(scale) : 1;
}, [props.listMode]);
// Recalculate memo distribution when layout changes
const redistributeMemos = useCallback(() => {
const prefixHeight = prefixElementRef.current?.offsetHeight || 0;
const { distribution: newDistribution } = distributeMemosToColumns(props.memoList, columns, itemHeights, prefixHeight);
setDistribution(newDistribution);
}, [props.memoList, columns, itemHeights]);
// Handle height changes from individual memo items
const handleHeightChange = useCallback(
(memoName: string, height: number) => {
setItemHeights((prevHeights) => {
const newItemHeights = new Map(prevHeights);
newItemHeights.set(memoName, height);
// Recalculate distribution with new heights
const prefixHeight = prefixElementRef.current?.offsetHeight || 0;
const { distribution: newDistribution } = distributeMemosToColumns(props.memoList, columns, newItemHeights, prefixHeight);
setDistribution(newDistribution);
return newItemHeights;
});
},
[props.memoList, columns],
// Create render context: automatically enable compact mode when multiple columns
const renderContext: MemoRenderContext = useMemo(
() => ({
compact: columns > 1,
columns,
}),
[columns],
);
// Handle window resize and calculate new column count
useEffect(() => {
const handleResize = () => {
if (!containerRef.current) return;
const newColumns = calculateColumns();
if (newColumns !== columns) {
setColumns(newColumns);
}
};
handleResize();
window.addEventListener("resize", handleResize);
return () => window.removeEventListener("resize", handleResize);
}, [calculateColumns, columns]);
// Redistribute memos when columns, memo list, or heights change
useEffect(() => {
redistributeMemos();
}, [redistributeMemos]);
return (
<div
ref={containerRef}
@ -160,22 +46,17 @@ const MasonryView = (props: Props) => {
}}
>
{Array.from({ length: columns }).map((_, columnIndex) => (
<div key={columnIndex} className="min-w-0 mx-auto w-full max-w-2xl">
{/* Prefix element (like memo editor) goes in first column */}
{props.prefixElement && columnIndex === 0 && <div ref={prefixElementRef}>{props.prefixElement}</div>}
{distribution[columnIndex]?.map((memoIndex) => {
const memo = props.memoList[memoIndex];
return memo ? (
<MemoItem
key={`${memo.name}-${memo.displayTime}`}
memo={memo}
renderer={props.renderer}
onHeightChange={handleHeightChange}
/>
) : null;
})}
</div>
<MasonryColumn
key={columnIndex}
memoIndices={distribution[columnIndex] || []}
memoList={memoList}
renderer={renderer}
renderContext={renderContext}
onHeightChange={handleHeightChange}
isFirstColumn={columnIndex === 0}
prefixElement={prefixElement}
prefixElementRef={prefixElementRef}
/>
))}
</div>
);

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/**
* Minimum width required to show more than one column in masonry layout
* When viewport is narrower, layout falls back to single column
*/
export const MINIMUM_MEMO_VIEWPORT_WIDTH = 512;
/**
* Debounce delay for redistribution in milliseconds
* Balances responsiveness with performance by batching rapid height changes
*/
export const REDISTRIBUTION_DEBOUNCE_MS = 100;

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import { Memo } from "@/types/proto/api/v1/memo_service";
import { DistributionResult } from "./types";
/**
* Distributes memos into columns using a height-aware greedy approach.
*
* Algorithm steps:
* 1. Pin editor and first memo to the first column (keep feed stable)
* 2. Place remaining memos into the currently shortest column
* 3. Break height ties by preferring the column with fewer items
*
* @param memos - Array of memos to distribute
* @param columns - Number of columns to distribute across
* @param itemHeights - Map of memo names to their measured heights
* @param prefixElementHeight - Height of prefix element (e.g., editor) in first column
* @returns Distribution result with memo indices per column and column heights
*/
export function distributeItemsToColumns(
memos: Memo[],
columns: number,
itemHeights: Map<string, number>,
prefixElementHeight: number = 0,
): DistributionResult {
// Single column mode: all memos in one column
if (columns === 1) {
const totalHeight = memos.reduce((sum, memo) => sum + (itemHeights.get(memo.name) || 0), prefixElementHeight);
return {
distribution: [Array.from({ length: memos.length }, (_, i) => i)],
columnHeights: [totalHeight],
};
}
// Initialize columns and their heights
const distribution: number[][] = Array.from({ length: columns }, () => []);
const columnHeights: number[] = Array(columns).fill(0);
const columnCounts: number[] = Array(columns).fill(0);
// Add prefix element height to first column
if (prefixElementHeight > 0) {
columnHeights[0] = prefixElementHeight;
}
let startIndex = 0;
// Pin the first memo to the first column to keep top-of-feed stable
if (memos.length > 0) {
const firstMemoHeight = itemHeights.get(memos[0].name) || 0;
distribution[0].push(0);
columnHeights[0] += firstMemoHeight;
columnCounts[0] += 1;
startIndex = 1;
}
for (let i = startIndex; i < memos.length; i++) {
const memo = memos[i];
const height = itemHeights.get(memo.name) || 0;
// Find column with minimum height
const shortestColumnIndex = findShortestColumnIndex(columnHeights, columnCounts);
distribution[shortestColumnIndex].push(i);
columnHeights[shortestColumnIndex] += height;
columnCounts[shortestColumnIndex] += 1;
}
return { distribution, columnHeights };
}
/**
* Finds the index of the column with the minimum height
* @param columnHeights - Array of column heights
* @param columnCounts - Array of items per column (for tie-breaking)
* @returns Index of the shortest column
*/
function findShortestColumnIndex(columnHeights: number[], columnCounts: number[]): number {
let minIndex = 0;
let minHeight = columnHeights[0];
for (let i = 1; i < columnHeights.length; i++) {
const currentHeight = columnHeights[i];
if (currentHeight < minHeight) {
minHeight = currentHeight;
minIndex = i;
continue;
}
// Tie-breaker: prefer column with fewer items to avoid stacking
if (currentHeight === minHeight && columnCounts[i] < columnCounts[minIndex]) {
minIndex = i;
}
}
return minIndex;
}

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@ -1,3 +1,25 @@
import MasonryView from "./MasonryView";
// Main component
export { default } from "./MasonryView";
export default MasonryView;
// Sub-components (exported for testing or advanced usage)
export { MasonryColumn } from "./MasonryColumn";
export { MasonryItem } from "./MasonryItem";
// Hooks
export { useMasonryLayout } from "./useMasonryLayout";
// Utilities
export { distributeItemsToColumns } from "./distributeItems";
// Types
export type {
MasonryViewProps,
MasonryItemProps,
MasonryColumnProps,
DistributionResult,
MemoWithHeight,
MemoRenderContext,
} from "./types";
// Constants
export { MINIMUM_MEMO_VIEWPORT_WIDTH, REDISTRIBUTION_DEBOUNCE_MS } from "./constants";

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import { Memo } from "@/types/proto/api/v1/memo_service";
/**
* Render context passed to memo renderer
*/
export interface MemoRenderContext {
/** Whether to render in compact mode (automatically enabled for multi-column layouts) */
compact: boolean;
/** Current number of columns in the layout */
columns: number;
}
/**
* Props for the main MasonryView component
*/
export interface MasonryViewProps {
/** List of memos to display in masonry layout */
memoList: Memo[];
/** Render function for each memo. Second parameter provides layout context. */
renderer: (memo: Memo, context?: MemoRenderContext) => JSX.Element;
/** Optional element to display at the top of the first column (e.g., memo editor) */
prefixElement?: JSX.Element;
/** Force single column layout regardless of viewport width */
listMode?: boolean;
}
/**
* Props for individual MasonryItem component
*/
export interface MasonryItemProps {
/** The memo to render */
memo: Memo;
/** Render function for the memo */
renderer: (memo: Memo, context?: MemoRenderContext) => JSX.Element;
/** Render context for the memo */
renderContext: MemoRenderContext;
/** Callback when item height changes */
onHeightChange: (memoName: string, height: number) => void;
}
/**
* Props for MasonryColumn component
*/
export interface MasonryColumnProps {
/** Indices of memos in this column */
memoIndices: number[];
/** Full list of memos */
memoList: Memo[];
/** Render function for each memo */
renderer: (memo: Memo, context?: MemoRenderContext) => JSX.Element;
/** Render context for memos */
renderContext: MemoRenderContext;
/** Callback when item height changes */
onHeightChange: (memoName: string, height: number) => void;
/** Whether this is the first column (for prefix element) */
isFirstColumn: boolean;
/** Optional prefix element (only rendered in first column) */
prefixElement?: JSX.Element;
/** Ref for prefix element height measurement */
prefixElementRef?: React.RefObject<HTMLDivElement>;
}
/**
* Result of the distribution algorithm
*/
export interface DistributionResult {
/** Array of arrays, where each inner array contains memo indices for that column */
distribution: number[][];
/** Height of each column after distribution */
columnHeights: number[];
}
/**
* Memo item with measured height
*/
export interface MemoWithHeight {
/** Index of the memo in the original list */
index: number;
/** Measured height in pixels */
height: number;
}

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@ -0,0 +1,150 @@
import { useCallback, useEffect, useRef, useState } from "react";
import { Memo } from "@/types/proto/api/v1/memo_service";
import { MINIMUM_MEMO_VIEWPORT_WIDTH, REDISTRIBUTION_DEBOUNCE_MS } from "./constants";
import { distributeItemsToColumns } from "./distributeItems";
/**
* Custom hook for managing masonry layout state and logic
*
* Responsibilities:
* - Calculate optimal number of columns based on viewport width
* - Track item heights and trigger redistribution
* - Debounce redistribution to prevent excessive reflows
* - Handle window resize events
*
* @param memoList - Array of memos to layout
* @param listMode - Force single column mode
* @param containerRef - Reference to the container element
* @param prefixElementRef - Reference to the prefix element
* @returns Layout state and handlers
*/
export function useMasonryLayout(
memoList: Memo[],
listMode: boolean,
containerRef: React.RefObject<HTMLDivElement>,
prefixElementRef: React.RefObject<HTMLDivElement>,
) {
const [columns, setColumns] = useState(1);
const [itemHeights, setItemHeights] = useState<Map<string, number>>(new Map());
const [distribution, setDistribution] = useState<number[][]>([[]]);
const redistributionTimeoutRef = useRef<number | null>(null);
const itemHeightsRef = useRef<Map<string, number>>(itemHeights);
// Keep ref in sync with state
useEffect(() => {
itemHeightsRef.current = itemHeights;
}, [itemHeights]);
/**
* Calculate optimal number of columns based on container width
* Uses a scale factor to determine column count
*/
const calculateColumns = useCallback(() => {
if (!containerRef.current || listMode) return 1;
const containerWidth = containerRef.current.offsetWidth;
const scale = containerWidth / MINIMUM_MEMO_VIEWPORT_WIDTH;
return scale >= 2 ? Math.round(scale) : 1;
}, [containerRef, listMode]);
/**
* Recalculate memo distribution when layout changes
*/
const redistributeMemos = useCallback(() => {
const prefixHeight = prefixElementRef.current?.offsetHeight || 0;
setDistribution(() => {
const { distribution: newDistribution } = distributeItemsToColumns(memoList, columns, itemHeightsRef.current, prefixHeight);
return newDistribution;
});
}, [memoList, columns, prefixElementRef]);
/**
* Debounced redistribution to batch multiple height changes and prevent excessive reflows
*/
const debouncedRedistribute = useCallback(
(newItemHeights: Map<string, number>) => {
// Clear any pending redistribution
if (redistributionTimeoutRef.current) {
clearTimeout(redistributionTimeoutRef.current);
}
// Schedule new redistribution after debounce delay
redistributionTimeoutRef.current = window.setTimeout(() => {
const prefixHeight = prefixElementRef.current?.offsetHeight || 0;
setDistribution(() => {
const { distribution: newDistribution } = distributeItemsToColumns(memoList, columns, newItemHeights, prefixHeight);
return newDistribution;
});
}, REDISTRIBUTION_DEBOUNCE_MS);
},
[memoList, columns, prefixElementRef],
);
/**
* Handle height changes from individual memo items
*/
const handleHeightChange = useCallback(
(memoName: string, height: number) => {
setItemHeights((prevHeights) => {
const newItemHeights = new Map(prevHeights);
const previousHeight = prevHeights.get(memoName);
// Skip if height hasn't changed (avoid unnecessary updates)
if (previousHeight === height) {
return prevHeights;
}
newItemHeights.set(memoName, height);
// Use debounced redistribution to batch updates
debouncedRedistribute(newItemHeights);
return newItemHeights;
});
},
[debouncedRedistribute],
);
/**
* Handle window resize and calculate new column count
*/
useEffect(() => {
const handleResize = () => {
if (!containerRef.current) return;
const newColumns = calculateColumns();
if (newColumns !== columns) {
setColumns(newColumns);
}
};
handleResize();
window.addEventListener("resize", handleResize);
return () => window.removeEventListener("resize", handleResize);
}, [calculateColumns, columns, containerRef]);
/**
* Redistribute memos when columns or memo list change
*/
useEffect(() => {
redistributeMemos();
}, [columns, memoList, redistributeMemos]);
/**
* Cleanup timeout on unmount
*/
useEffect(() => {
return () => {
if (redistributionTimeoutRef.current) {
clearTimeout(redistributionTimeoutRef.current);
}
};
}, []);
return {
columns,
distribution,
handleHeightChange,
};
}

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@ -12,11 +12,11 @@ import { State } from "@/types/proto/api/v1/common";
import { Memo } from "@/types/proto/api/v1/memo_service";
import { useTranslate } from "@/utils/i18n";
import Empty from "../Empty";
import MasonryView from "../MasonryView";
import MasonryView, { MemoRenderContext } from "../MasonryView";
import MemoEditor from "../MemoEditor";
interface Props {
renderer: (memo: Memo) => JSX.Element;
renderer: (memo: Memo, context?: MemoRenderContext) => JSX.Element;
listSort?: (list: Memo[]) => Memo[];
state?: State;
orderBy?: string;

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@ -1,6 +1,7 @@
import dayjs from "dayjs";
import { observer } from "mobx-react-lite";
import { useMemo } from "react";
import { MemoRenderContext } from "@/components/MasonryView";
import MemoView from "@/components/MemoView";
import PagedMemoList from "@/components/PagedMemoList";
import useCurrentUser from "@/hooks/useCurrentUser";
@ -27,7 +28,9 @@ const Archived = observer(() => {
return (
<PagedMemoList
renderer={(memo: Memo) => <MemoView key={`${memo.name}-${memo.updateTime}`} memo={memo} showVisibility compact />}
renderer={(memo: Memo, context?: MemoRenderContext) => (
<MemoView key={`${memo.name}-${memo.updateTime}`} memo={memo} showVisibility compact={context?.compact} />
)}
listSort={(memos: Memo[]) =>
memos
.filter((memo) => memo.state === State.ARCHIVED)

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@ -1,5 +1,6 @@
import dayjs from "dayjs";
import { observer } from "mobx-react-lite";
import { MemoRenderContext } from "@/components/MasonryView";
import MemoView from "@/components/MemoView";
import MobileHeader from "@/components/MobileHeader";
import PagedMemoList from "@/components/PagedMemoList";
@ -16,7 +17,9 @@ const Explore = observer(() => {
{!md && <MobileHeader />}
<div className="w-full px-4 sm:px-6">
<PagedMemoList
renderer={(memo: Memo) => <MemoView key={`${memo.name}-${memo.updateTime}`} memo={memo} showCreator showVisibility compact />}
renderer={(memo: Memo, context?: MemoRenderContext) => (
<MemoView key={`${memo.name}-${memo.updateTime}`} memo={memo} showCreator showVisibility compact={context?.compact} />
)}
listSort={(memos: Memo[]) =>
memos
.filter((memo) => memo.state === State.NORMAL)

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@ -1,6 +1,7 @@
import dayjs from "dayjs";
import { observer } from "mobx-react-lite";
import { useMemo } from "react";
import { MemoRenderContext } from "@/components/MasonryView";
import MemoView from "@/components/MemoView";
import PagedMemoList from "@/components/PagedMemoList";
import useCurrentUser from "@/hooks/useCurrentUser";
@ -56,7 +57,9 @@ const Home = observer(() => {
return (
<div className="w-full min-h-full bg-background text-foreground">
<PagedMemoList
renderer={(memo: Memo) => <MemoView key={`${memo.name}-${memo.displayTime}`} memo={memo} showVisibility showPinned compact />}
renderer={(memo: Memo, context?: MemoRenderContext) => (
<MemoView key={`${memo.name}-${memo.displayTime}`} memo={memo} showVisibility showPinned compact={context?.compact} />
)}
listSort={(memos: Memo[]) =>
memos
.filter((memo) => memo.state === State.NORMAL)

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@ -5,6 +5,7 @@ import { observer } from "mobx-react-lite";
import { useEffect, useMemo, useState } from "react";
import { toast } from "react-hot-toast";
import { useParams } from "react-router-dom";
import { MemoRenderContext } from "@/components/MasonryView";
import MemoView from "@/components/MemoView";
import PagedMemoList from "@/components/PagedMemoList";
import UserAvatar from "@/components/UserAvatar";
@ -89,8 +90,8 @@ const UserProfile = observer(() => {
</div>
</div>
<PagedMemoList
renderer={(memo: Memo) => (
<MemoView key={`${memo.name}-${memo.displayTime}`} memo={memo} showVisibility showPinned compact />
renderer={(memo: Memo, context?: MemoRenderContext) => (
<MemoView key={`${memo.name}-${memo.displayTime}`} memo={memo} showVisibility showPinned compact={context?.compact} />
)}
listSort={(memos: Memo[]) =>
memos