import React, { useContext, useCallback }
from 'react'
import { decode, DESC }
from './orders'
import { ConfigContext }
from './Table'
import { TableDispatch, COLUMN_REORDERING }
from './actions'
import { TableStateType, ColumnsType }
from './prop-types'
import { LEVELS, log }
from './utils'
const HeadContent = props => {
log(
'HeadContent', LEVELS.INFO, props)
const { components, layouts } = useContext(ConfigContext)
const { state, columns } = props
const dispatch = useContext(TableDispatch)
const { header } = components
const { sort } = state
const { order, name } = decode(sort)
const handleDragStart = useCallback(event => {
const th = event.target.closest(
'.rrt-th')
const id = th.dataset.id
event.dataTransfer.setDragImage(th, 0, 0)
event.dataTransfer.setData(
'text/plain', id)
}, [])
const handleDragOver = useCallback(
event => {
event.preventDefault()
event.dataTransfer.dropEffect =
'move'
},
[columns]
)
const handleDrop = useCallback(
event => {
const allColumns = state.columns
const ida = event.target.closest(
'.rrt-th').dataset.id
const idb = event.dataTransfer.getData(
'text/plain')
if (ida !== idb && columns.findIndex(({ id }) => id === idb) !== -1) {
const newColumns = [...allColumns]
const ixa = allColumns.findIndex(({ id }) => id === ida)
const ixb = allColumns.findIndex(({ id }) => id === idb)
newColumns[ixa] = allColumns[ixb]
newColumns[ixb] = allColumns[ixa]
dispatch({ type: COLUMN_REORDERING, columns: newColumns })
}
event.preventDefault()
event.stopPropagation()
},
[state.columns, dispatch]
)
return (
<>
{columns.map((column, index) => {
const { id, resizable = true, sortable = true, flexible = false } = column
const layout = layouts[id]
const { className } = layout
const shouldFlex = flexible || (resizable && index === columns.length - 1)
const sorted = sortable && name === id ? order === DESC : undefined
const props = {
index,
column,
layout,
sorted,
resizable: resizable && !shouldFlex,
...header.props
}
return (
<div
key={index}
className={`rrt-th ${className}${shouldFlex ?
' flex' :
''}
`}
onDragStart={handleDragStart}
draggable
data-id={id}
onDragOver={handleDragOver}
onDrop={handleDrop}
>
{React.createElement(header.type, props)}
</div>
)
})}
</>
)
}
HeadContent.propTypes = {
state: TableStateType,
columns: ColumnsType
}
HeadContent.displayName = 'HeadContent'
export const areEqual = (prev, next) => {
const prevState = prev.state
const nextState = next.state
const areEqual =
prev.columns === next.columns && prevState.sort === nextState.sort
Copyright 2020 Ulrich Gaal
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
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.