enigma-bbs/core/edit_text_view.js

/* jslint node: true */
'use strict';

//  ENiGMA½
const TextView      = require('./text_view.js').TextView;
const miscUtil      = require('./misc_util.js');
const strUtil       = require('./string_util.js');

const VIEW_SPECIAL_KEY_MAP_DEFAULT = require('./view').VIEW_SPECIAL_KEY_MAP_DEFAULT;

//  deps
const _             = require('lodash');

exports.EditTextView    = EditTextView;

const EDIT_TEXT_VIEW_KEY_MAP = Object.assign({}, VIEW_SPECIAL_KEY_MAP_DEFAULT, {
    delete : [ 'delete', 'ctrl + d' ],  //  https://www.tecmint.com/linux-command-line-bash-shortcut-keys/
});

function EditTextView(options) {
    options.acceptsFocus    = miscUtil.valueWithDefault(options.acceptsFocus, true);
    options.acceptsInput    = miscUtil.valueWithDefault(options.acceptsInput, true);
    options.cursorStyle     = miscUtil.valueWithDefault(options.cursorStyle, 'steady block');
    options.resizable       = false;

    if(!_.isObject(options.specialKeyMap)) {
        options.specialKeyMap = EDIT_TEXT_VIEW_KEY_MAP;
    }

    TextView.call(this, options);

    this.initDefaultWidth();
    this.cursorPos = { row : 0, col : 0 };

    this.clientBackspace = function() {
        this.text = this.text.substr(0, this.text.length - 1);

        if(this.text.length >= this.dimens.width) {
            this.redraw();
        } else {
            this.cursorPos.col -= 1;
            if(this.cursorPos.col >= 0) {
                const fillCharSGR = this.getStyleSGR(1) || this.getSGR();
                this.client.term.write(`\b${fillCharSGR}${this.fillChar}\b${this.getFocusSGR()}`);
            }
        }
    }
}

require('util').inherits(EditTextView, TextView);

EditTextView.prototype.onKeyPress = function(ch, key) {
    if(key) {
        if(this.isKeyMapped('backspace', key.name)) {
            if(this.text.length > 0) {
                this.clientBackspace();
            }

            return EditTextView.super_.prototype.onKeyPress.call(this, ch, key);
        } else if (this.isKeyMapped('delete', key.name)) {
            //  Some (mostly older) terms send 'delete' for Backspace.
            //  if we're at the end of the line, go ahead and treat them the same
            if (this.text.length > 0 && this.cursorPos.col === this.text.length) {
                this.clientBackspace();
            }
        } else if(this.isKeyMapped('clearLine', key.name)) {
            this.text           = '';
            this.cursorPos.col  = 0;
            this.setFocus(true);    //  resetting focus will redraw & adjust cursor

            return EditTextView.super_.prototype.onKeyPress.call(this, ch, key);
        }
    }

    if(ch && strUtil.isPrintable(ch)) {
        if(this.text.length < this.maxLength) {
            ch = strUtil.stylizeString(ch, this.textStyle);

            this.text += ch;

            if(this.text.length > this.dimens.width) {
                //  no shortcuts - redraw the view
                this.redraw();
            } else {
                this.cursorPos.col += 1;

                if(_.isString(this.textMaskChar)) {
                    if(this.textMaskChar.length > 0) {
                        this.client.term.write(this.textMaskChar);
                    }
                } else {
                    this.client.term.write(ch);
                }
            }
        }
    }

    EditTextView.super_.prototype.onKeyPress.call(this, ch, key);
};

EditTextView.prototype.setText = function(text) {
    //  draw & set |text|
    EditTextView.super_.prototype.setText.call(this, text);

    //  adjust local cursor tracking
    this.cursorPos = { row : 0, col : text.length };
};