src/adapters/ui/search.js

/*
 * OS.js - JavaScript Cloud/Web Desktop Platform
 *
 * Copyright (c) Anders Evenrud <andersevenrud@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @author  Anders Evenrud <andersevenrud@gmail.com>
 * @license Simplified BSD License
 */

import {h, app} from 'hyperapp';
import {EventEmitter} from '@osjs/event-emitter';

const createView = (core, fs, icon, _) => {
  const resultView = ({results, index}, actions) => results.map((r, i) => h('li', {
    onclick: () => actions.open(i),
    onupdate: el => {
      if (i === index) {
        el.scrollIntoView();
      }
    },
    class: [
      'osjs-search-result',
      index === i ? 'osjs__active' : ''
    ].join(' ')
  }, [
    h('img', {src: icon(fs.icon(r).name)}),
    h('span', {}, `${r.path} (${r.mime})`)
  ]));

  return (state, actions) => h('div', {
    class: 'osjs-search-container osjs-notification',
    style: {
      display: state.visible ? undefined : 'none'
    }
  }, [
    h('input', {
      type: 'text',
      placeholder: _('LBL_SEARCH_PLACEHOLDER'),
      class: 'osjs-search-input',
      value: state.query,
      onblur: () => {
        if (!state.value) {
          setTimeout(() => actions.toggle(false), 300);
        }
      },
      oninput: ev => actions.setQuery(ev.target.value),
      onkeydown: ev => {
        if (ev.keyCode === 38) { // Up
          actions.setPreviousIndex();
        } else if (ev.keyCode === 40) { // Down
          actions.setNextIndex();
        } else if (ev.keyCode === 27) { // Escape
          actions.resetIndex();

          if (state.index === -1) {
            actions.hide();
          }
        }
      },
      onkeypress: ev => {
        if (ev.keyCode === 13) {
          if (state.index >= 0) {
            actions.open(state.index);
          } else {
            actions.search(state.query.replace(/\*?$/, '*').replace(/^\*?/, '*'));
          }
        }
      }
    }),
    h('div', {
      'data-error': !!state.error,
      class: 'osjs-search-message',
      style: {
        display: (state.error || state.status) ? 'block' : 'none'
      }
    }, state.error || state.status),
    h('ol', {
      class: 'osjs-search-results',
      style: {
        display: state.results.length ? undefined : 'none'
      }
    }, resultView(state, actions))
  ]);
};

/**
 * Search UI Adapter
 */
const create = (core, $element) => {
  const _ = core.make('osjs/locale').translate;
  const fs = core.make('osjs/fs');
  const {icon} = core.make('osjs/theme');
  const view = createView(core, fs, icon, _);
  const ee = new EventEmitter('SearchUI');

  const hyperapp = app({
    query: '',
    index: -1,
    status: undefined,
    error: null,
    visible: false,
    results: []
  }, {
    search: query => {
      ee.emit('search', query);

      return {status: _('LBL_SEARCH_WAIT')};
    },
    open: index => (state, actions) => {
      const iter = state.results[index];
      if (iter) {
        ee.emit('open', iter);
      }

      actions.toggle(false);
    },
    resetIndex: () => () => ({
      index: -1
    }),
    setNextIndex: () => state => ({
      index: (state.index + 1) % state.results.length
    }),
    setPreviousIndex: () => state => ({
      index: state.index <= 0 ? state.results.length - 1 : state.index - 1
    }),
    setError: error => () => ({
      error,
      status: undefined,
      index: -1
    }),
    setResults: results => () => ({
      results,
      index: -1,
      status: _('LBL_SEARCH_RESULT', results.length),
    }),
    setQuery: query => () => ({
      query
    }),
    hide: () => {
      ee.emit('hide');
    },
    toggle: visible => state => ({
      query: '',
      results: [],
      index: -1,
      status: undefined,
      error: null,
      visible: typeof visible === 'boolean' ? visible : !state.visible
    })
  }, view, $element);

  ee.on('error', error => hyperapp.setError(error));
  ee.on('success', results => hyperapp.setResults(results));
  ee.on('toggle', toggle => hyperapp.toggle(toggle));
  ee.on('focus', () => {
    const el = $element.querySelector('.osjs-search-input');
    if (el) {
      el.focus();
    }
  });

  return ee;
};

export default create;