enigma-bbs/core/text_view.js

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

//  ENiGMA½
const View                  = require('./view.js').View;
const miscUtil              = require('./misc_util.js');
const ansi                  = require('./ansi_term.js');
const padStr                = require('./string_util.js').pad;
const stylizeString         = require('./string_util.js').stylizeString;
const renderSubstr          = require('./string_util.js').renderSubstr;
const renderStringLength    = require('./string_util.js').renderStringLength;
const pipeToAnsi            = require('./color_codes.js').pipeToAnsi;
const stripAllLineFeeds     = require('./string_util.js').stripAllLineFeeds;

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

exports.TextView            = TextView;

function TextView(options) {
    if(options.dimens) {
        options.dimens.height = 1;  //  force height of 1 for TextView's & sub classes
    }

    View.call(this, options);

    if(options.maxLength) {
        this.maxLength = options.maxLength;
    } else {
        this.maxLength = this.client.term.termWidth - this.position.col;
    }

    this.fillChar           = renderSubstr(miscUtil.valueWithDefault(options.fillChar, ' '), 0, 1);
    this.justify            = options.justify || 'left';
    this.resizable          = miscUtil.valueWithDefault(options.resizable, true);
    this.horizScroll        = miscUtil.valueWithDefault(options.horizScroll, true);

    if(_.isString(options.textOverflow)) {
        this.textOverflow = options.textOverflow;
    }

    if(_.isString(options.textMaskChar) && 1 === options.textMaskChar.length) {
        this.textMaskChar = options.textMaskChar;
    }

    this.drawText = function(s) {

        //
        //                     |<- this.maxLength
        //   ABCDEFGHIJK
        //  |ABCDEFG|  ^_ this.text.length
        //          ^-- this.dimens.width
        //
        let renderLength = renderStringLength(s);   //  initial; may be adjusted below:

        let textToDraw = _.isString(this.textMaskChar) ?
            new Array(renderLength + 1).join(this.textMaskChar) :
            stylizeString(s, this.hasFocus ? this.focusTextStyle : this.textStyle);

        renderLength = renderStringLength(textToDraw);

        if(renderLength >= this.dimens.width) {
            if(this.hasFocus) {
                if(this.horizScroll) {
                    textToDraw = renderSubstr(textToDraw, renderLength - this.dimens.width, renderLength);
                }
            } else {
                if(this.textOverflow &&
                    this.dimens.width > this.textOverflow.length &&
                    renderLength - this.textOverflow.length >= this.textOverflow.length)
                {
                    textToDraw = renderSubstr(textToDraw, 0, this.dimens.width - this.textOverflow.length) + this.textOverflow;
                } else {
                    textToDraw = renderSubstr(textToDraw, 0, this.dimens.width);
                }
            }
        }

        const renderedFillChar = pipeToAnsi(this.fillChar);

        this.client.term.write(
            padStr(
                textToDraw,
                this.dimens.width,
                renderedFillChar, //this.fillChar,
                this.justify,
                this.hasFocus ? this.getFocusSGR() : this.getSGR(),
                this.getStyleSGR(1) || this.getSGR(),
                true    //  use render len
            ),
            false   //  no converting CRLF needed
        );
    };


    this.getEndOfTextColumn = function() {
        var offset = Math.min(this.text.length, this.dimens.width);
        return this.position.col + offset;
    };

    this.setText(options.text || '', false);    //  false=do not redraw now
}

util.inherits(TextView, View);

TextView.prototype.redraw = function() {
    //
    //  A lot of views will get an initial redraw() with empty text (''). We can short
    //  circuit this by NOT doing any of the work if this is the initial drawText
    //  and there is no actual text (e.g. save SGR's and processing)
    //
    if(!this.hasDrawnOnce) {
        if(_.isUndefined(this.text)) {
            return;
        }
    }
    this.hasDrawnOnce = true;

    TextView.super_.prototype.redraw.call(this);

    if(_.isString(this.text)) {
        this.drawText(this.text);
    }
};

TextView.prototype.setFocus = function(focused) {
    TextView.super_.prototype.setFocus.call(this, focused);

    this.redraw();

    this.client.term.write(ansi.goto(this.position.row, this.getEndOfTextColumn()));
    this.client.term.write(this.getFocusSGR());
};

TextView.prototype.getData = function() {
    return this.text;
};

TextView.prototype.setText = function(text, redraw) {
    redraw = _.isBoolean(redraw) ? redraw : true;

    if(!_.isString(text)) { //  allow |text| to be numbers/etc.
        text = text.toString();
    }

    this.text = pipeToAnsi(stripAllLineFeeds(text), this.client);    //  expand MCI/etc.
    if(this.maxLength > 0) {
        this.text = renderSubstr(this.text, 0, this.maxLength);
    }

    //  :TODO: it would be nice to be able to stylize strings with MCI and {special} MCI syntax, e.g. "|BN {UN!toUpper}"
    this.text = stylizeString(this.text, this.hasFocus ? this.focusTextStyle : this.textStyle);

    if(redraw) {
        this.redraw();
    }
};

TextView.prototype.clearText = function() {
    this.setText('');
};

TextView.prototype.setPropertyValue = function(propName, value) {
    switch(propName) {
        case 'textMaskChar' : this.textMaskChar = value.substr(0, 1); break;
        case 'textOverflow' : this.textOverflow = value; break;
        case 'maxLength'    : this.maxLength = parseInt(value, 10); break;
        case 'password'     :
            if(true === value) {
                this.textMaskChar = this.client.currentTheme.helpers.getPasswordChar();
            }
            break;
    }


    TextView.super_.prototype.setPropertyValue.call(this, propName, value);
};