enigma-bbs/core/text_view.js

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

var View			= require('./view.js').View;
var miscUtil		= require('./misc_util.js');
var strUtil			= require('./string_util.js');
var ansi			= require('./ansi_term.js');

var util			= require('util');
var assert			= require('assert');
var _				= 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);

	var self = this;

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

	this.fillChar			= miscUtil.valueWithDefault(options.fillChar, ' ').substr(0, 1);
	this.justify			= options.justify || 'right';
	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
		//
		var textToDraw = _.isString(this.textMaskChar) ? 
			new Array(s.length + 1).join(this.textMaskChar) : 
			strUtil.stylizeString(s, this.hasFocus ? this.focusTextStyle : this.textStyle);

		if(textToDraw.length > this.dimens.width) {
			//	XXXXXXXXXXXXXXXXX
			//	this is the text but too long
			//	text but too long
			if(this.hasFocus) {
				if(this.horizScroll) {
					textToDraw = textToDraw.substr(textToDraw.length - this.dimens.width, textToDraw.length);
				}
			} else {
				if(textToDraw.length > this.dimens.width) {
					if(this.textOverflow && 
						this.dimens.width > this.textOverflow.length &&
						textToDraw.length - this.textOverflow.length >= this.textOverflow.length)
					{
						textToDraw = textToDraw.substr(0, this.dimens.width - this.textOverflow.length) + this.textOverflow;
					} else {
						textToDraw = textToDraw.substr(0, this.dimens.width);
					}
				}				
			}
		}

		this.client.term.write(strUtil.pad(
			textToDraw,
			this.dimens.width + 1,
			this.fillChar,
			this.justify,
			this.hasFocus ? this.getFocusSGR() : this.getSGR(),
			this.getStyleSGR(1) || this.getSGR()
			));
	};

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

	this.setText(options.text || '');
}

util.inherits(TextView, View);

TextView.prototype.redraw = function() {
	TextView.super_.prototype.redraw.call(this);

	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) {

	var widthDelta = 0;
	if(this.text && this.text !== text) {
		widthDelta = Math.abs(this.text.length - text.length);
	}

	this.text = text;

	if(this.maxLength > 0) {
		this.text = this.text.substr(0, this.maxLength);
	}

	this.text = strUtil.stylizeString(this.text, this.hasFocus ? this.focusTextStyle : this.textStyle);	

	if(this.resizable) {
		this.dimens.width = this.text.length + widthDelta;
	}

	this.redraw();
};

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