smalltalk/lib/smalltalk.js

Promise-based Alert, Confirm and Prompt replacement

'use strict';

require('../css/smalltalk.css');

const currify = require('currify');
const store = require('fullstore');
const createElement = require('@cloudcmd/create-element');

const isBool = (a) => typeof a === 'boolean';

const keyDown = currify(keyDown_);

const BUTTON_OK = {
    ok: 'OK',
};

const BUTTON_OK_CANCEL = {
    ok: 'OK',
    cancel: 'Cancel',
};

const zIndex = store(100);

module.exports.alert = (title, msg, options) => {
    const buttons = getButtons(options) || BUTTON_OK;
    return showDialog(title, msg, '', buttons, options);
};

module.exports.prompt = (title, msg, value = '', options) => {
    const type = getType(options);
    const val = String(value).replace(/"/g, '"');
    
    const valueStr = `<input type="${type}" value="${val}" data-name="js-input">`;
    const buttons = getButtons(options) || BUTTON_OK_CANCEL;
    
    return showDialog(title, msg, valueStr, buttons, options);
};

module.exports.confirm = (title, msg, options) => {
    const buttons = getButtons(options) || BUTTON_OK_CANCEL;
    
    return showDialog(title, msg, '', buttons, options);
};

module.exports.progress = (title, message, options) => {
    const valueStr = `
        <progress value="0" data-name="js-progress" class="progress" max="100"></progress>
        <span data-name="js-counter">0%</span>
    `;
    
    const buttons = {
        cancel: 'Abort',
    };
    
    const promise = showDialog(title, message, valueStr, buttons, options);
    const {ok, dialog} = promise;
    const resolve = ok();
    
    for (const el of find(dialog, ['cancel'])) {
        el.focus();
    }
    
    Object.assign(promise, {
        setProgress(count) {
            const [elProgress] = find(dialog, ['progress']);
            const [elCounter] = find(dialog, ['counter']);
            
            elProgress.value = count;
            elCounter.textContent = `${count}%`;
            
            if (count === 100) {
                remove(dialog);
                resolve();
            }
        },
        
        remove() {
            remove(dialog);
        },
    });
    
    return promise;
};

function getButtons(options = {}) {
    const {buttons} = options;
    
    if (!buttons)
        return null;
    
    return buttons;
}

function getType(options = {}) {
    const {type} = options;
    
    if (type === 'password')
        return 'password';
    
    return 'text';
}

function getTemplate(title, msg, value, buttons) {
    const encodedMsg = msg.replace(/\n/g, '<br>');
    
    return `<div class="page">
        <div data-name="js-close" class="close-button"></div>
        <header>${title}</header>
        <div class="content-area">${encodedMsg}${value}</div>
        <div class="action-area">
            <div class="button-strip">
                ${parseButtons(buttons)}
            </div>
        </div>
    </div>`;
}

function parseButtons(buttons) {
    const names = Object.keys(buttons);
    const parse = currify((buttons, name, i) => `<button
            tabindex=${i}
            data-name="js-${name.toLowerCase()}">
            ${buttons[name]}
        </button>`);
    
    return names
        .map(parse(buttons))
        .join('');
}

function showDialog(title, msg, value, buttons, options) {
    const ok = store();
    const cancel = store();
    
    const closeButtons = [
        'cancel',
        'close',
        'ok',
    ];
    
    const promise = new Promise((resolve, reject) => {
        const noCancel = options && isBool(options.cancel) && !options.cancel;
        const empty = () => {};
        const rejectError = () => reject(Error());
        
        ok(resolve);
        cancel(noCancel ? empty : rejectError);
    });
    
    const innerHTML = getTemplate(title, msg, value, buttons);
    
    const dialog = createElement('div', {
        innerHTML,
        className: 'smalltalk',
        style: `z-index: ${zIndex(zIndex() + 1)}`,
    });
    
    for (const el of find(dialog, ['ok', 'input']))
        el.focus();
    
    for (const el of find(dialog, ['input'])) {
        el.setSelectionRange(0, value.length);
    }
    
    addListenerAll('click', dialog, closeButtons, (event) => {
        closeDialog(event.target, dialog, ok(), cancel());
    });
    
    for (const event of ['click', 'contextmenu'])
        dialog.addEventListener(event, (e) => {
            e.stopPropagation();
            
            for (const el of find(dialog, ['ok', 'input']))
                el.focus();
        });
    
    dialog.addEventListener('keydown', keyDown(dialog, ok(), cancel()));
    
    return Object.assign(promise, {
        dialog,
        ok,
    });
}

function keyDown_(dialog, ok, cancel, event) {
    const KEY = {
        ENTER: 13,
        ESC: 27,
        TAB: 9,
        LEFT: 37,
        UP: 38,
        RIGHT: 39,
        DOWN: 40,
    };
    
    const {keyCode} = event;
    const el = event.target;
    
    const namesAll = [
        'ok',
        'cancel',
        'input',
    ];
    const names = find(dialog, namesAll).map(getDataName);
    
    switch(keyCode) {
    case KEY.ENTER:
        closeDialog(el, dialog, ok, cancel);
        event.preventDefault();
        break;
    
    case KEY.ESC:
        remove(dialog);
        cancel();
        break;
    
    case KEY.TAB:
        if (event.shiftKey)
            tab(dialog, names);
        
        tab(dialog, names);
        event.preventDefault();
        break;
    
    default:
        [
            'left',
            'right',
            'up',
            'down',
        ]
            .filter((name) => keyCode === KEY[name.toUpperCase()])
            .forEach(() => {
                changeButtonFocus(dialog, names);
            });
        
        break;
    }
    
    event.stopPropagation();
}

function getDataName(el) {
    return el
        .getAttribute('data-name')
        .replace('js-', '');
}

const getName = (activeName) => {
    if (activeName === 'cancel')
        return 'ok';
    
    return 'cancel';
};

function changeButtonFocus(dialog, names) {
    const active = document.activeElement;
    const activeName = getDataName(active);
    const isButton = /ok|cancel/.test(activeName);
    const count = names.length - 1;
    
    if (activeName === 'input' || !count || !isButton)
        return;
    
    const name = getName(activeName);
    
    for (const el of find(dialog, [name])) {
        el.focus();
    }
}

const getIndex = (count, index) => {
    if (index === count)
        return 0;
    
    return index + 1;
};

function tab(dialog, names) {
    const active = document.activeElement;
    const activeName = getDataName(active);
    const count = names.length - 1;
    
    const activeIndex = names.indexOf(activeName);
    const index = getIndex(count, activeIndex);
    
    const name = names[index];
    
    for (const el of find(dialog, [name]))
        el.focus();
}

function closeDialog(el, dialog, ok, cancel) {
    const name = el
        .getAttribute('data-name')
        .replace('js-', '');
    
    if (/close|cancel/.test(name)) {
        cancel();
        remove(dialog);
        
        return;
    }
    
    let value = null;
    
    for (const el of find(dialog, ['input'])) {
        value = el.value;
    }
    
    ok(value);
    remove(dialog);
}

const query = currify((element, name) => element.querySelector(`[data-name="js-${name}"]`));

function find(element, names) {
    const elements = names
        .map(query(element))
        .filter(Boolean);
    
    return elements;
}

function addListenerAll(event, parent, elements, fn) {
    for (const el of find(parent, elements)) {
        el.addEventListener(event, fn);
    }
}

function remove(dialog) {
    const {parentElement} = dialog;
    
    if (parentElement)
        parentElement.removeChild(dialog);
}