Mailspring/internal_packages/draft-list/lib/draft-list-toolbar.jsx

import React, {Component, PropTypes} from "react"
import DraftListStore from './draft-list-store'
import {ListensToObservable, MultiselectToolbar, InjectedComponentSet} from 'nylas-component-kit'


function getObservable() {
  return DraftListStore.selectionObservable()
}

function getStateFromObservable(items) {
  if (!items) {
    return {items: []}
  }
  return {items}
}

class DraftListToolbar extends Component {
  static displayName = 'DraftListToolbar';

  static propTypes = {
    items: PropTypes.array,
  };

  onClearSelection = () => {
    DraftListStore.dataSource().selection.clear()
  };

  render() {
    const {selection} = DraftListStore.dataSource()
    const {items} = this.props

    // Keep all of the exposed props from deprecated regions that now map to this one
    const toolbarElement = (
      <InjectedComponentSet
        matching={{role: "DraftActionsToolbarButton"}}
        exposedProps={{selection, items}}
      />
    )

    return (
      <MultiselectToolbar
        collection="draft"
        selectionCount={items.length}
        toolbarElement={toolbarElement}
        onClearSelection={this.onClearSelection}
      />
    )
  }
}

export default ListensToObservable(DraftListToolbar, {getObservable, getStateFromObservable})