react-konva-grid

Declarative Canvas Grid with React Konva

Canvas grid to render large set of tabular data. Uses virtualization similar to react-window

Demo

Features

• :electron: React powered declarative library
• :100: Virtualized: Only visible cells are rendered
• :bulb: Peformant: Canvas implementation with no DOM nodes
• :scroll: Supports scrolling using native scrollbars
• :computer: Supports both Fixed and Variable sized grids
• :fire: Freeze rows and columns
• :white_square_button: Merge rows and columns
• :hand: Resizable headers
• :hammer_and_wrench: Fully typed API written in TypeScript
• :muscle: Highly customizable using react-konva

Why another canvas grid library

Born out of frustration, having to deal with complicated imperative canvas libraries, I wanted to create something easy to understand and declarative in nature. This Grid primitive is built on top of React Konva making it easy to customize and extend. Take a look at the storybook to learn more.

Installation

npm

yarn add react-konva-grid

yarn

npm install react-konva-grid --save

Compatiblity

Konva grid will work in any browser that supports react, konva and canvas element.

Usage

import { Grid } from 'react-konva-grid'
import { Group, Text, Rect } from 'react-konva'

const App = () => {
  const Cell = ({ rowIndex, columnIndex, x, y, width, height}) => {
    return (
      <Group>
        <Rect
          x={x}
          y={y}
          height={height}
          width={width}
          fill="white"
          stroke="grey"
        />
        <Text
          x={x}
          y={y}
          height={height}
          width={width}
          text={text}
          verticalAlign="middle"
          align="center"
        />
      </Group>
    )
  }

  return (
    <Grid
      rowCount={100}
      columnCount={100}
      width={800}
      height={800}
      rowHeight={(rowIndex) => 20}
      columnWidth={(columnIndex) => 100}
      itemRenderer={Cell}
    />
  )
}

Props

This is the list of props that are meant to be used to customise the konva-grid behavior.

Name	Required	Type	Description	Default
width	true	number	Width of the grid container	800
height	true	number	Height of the grid container	800
columnCount	true	number	No of columns in the grid	200
rowCount	true	number	No of rows in the grid	200
rowHeight	true	function	Function that returns height of the row based on rowIndex	(rowIndex) => 20
columnWidth	true	function	Function that returns width of the column based on columnIndex	(columnIndex) => 100
itemRenderer	true	Function	React component to render the cell	null
scrollbarSize	false	number	Size of the scrollbar	17
showScrollbar	false	boolean	Always show scrollbar	true
selectionBackgroundColor	false	string	Background color of selected cells	rgba(66, 133, 244, 0.3)
selectionBorderColor	false	string	Border color of bounding box of selected cells	rgba(66, 133, 244, 1)
selections	false	Array	Array of selected cell areas	[]
mergedCells	false	Array	Array of merged cell areas	[]
frozenRows	false	number	No of frozen rows	0
frozenColumns	false	number	No of frozen columns	0

Methods

scrollTo({ scrollLeft, scrollTop }

Scrolls the grid to a specified x,y position relative to the container

resetAfterIndices({ rowIndex, columnIndex })

Imperatively trigger re-render of the grid after specified rowIndex or columnIndex

getScrollPosition()

Get the current scroll position of the grid.

const gridRef = useRef()
const { scrollLeft, scrollTop } = gridRef.current.getScrollPosition()

isMergedCell({ rowIndex, columnIndex })

Check if a cell at a coordinate is a merged cell

getCellBounds({ rowIndex, columnIndex })

Returns a selection IArea for a particular cell. Useful to get selection area of a merged cell

getCellCoordsFromOffsets(x , y)

Returns exact rowIndex and columnIndex from a x and y cordinate. Useful if you want to get cell coords based on mouse position

stage

Access Konva stage instance

const gridRef = useRef()

<Grid
  ref={gridRef}
>

const stage = gridRef.current.stage

Storybook

Examples can be found as stories in Grid.stories.tsx. To run storybook, enter the following commands

yarn
yarn run storybook

Contribution

Feel free to fork and submit pull requests

git clone https://github.com/rmdort/konva-grid.git
cd konva-grid
yarn
// Run storybook
yarn storybook