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f991833d68
Before, the printer "paper" would just keep accumulating changes. Now the `printer-modal` dialog has a "clear" button that will the paper.
72 lines
2.3 KiB
JavaScript
72 lines
2.3 KiB
JavaScript
/* Copyright 2010-2019 Will Scullin <scullin@scullinsteel.com>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation. No representations are made about the suitability of this
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* software for any purpose. It is provided "as is" without express or
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* implied warranty.
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*/
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/**
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* Printer UI. The "paper" is bound to the element selected by the input.
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*
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* Every line that is output to the printer is added as a <div> to the paper.
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* The high bit of all characters is stripped and only visible characters are
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* added to the output. The following characters receive special treatment:
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*
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* * `EOT` (ASCII 4): deletes last character
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* * `HT` (ASCII 9): replaced with 8 spaces
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* * `LF` (ASCII 10): silently removed
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* * `CR` (ASCII 13): a newline and carriage return
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*
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* @param {string} el The selector of the element on which to bind the "paper".
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*/
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export default function Printer(el) {
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var paper = document.querySelector(el);
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var _lineBuffer = '';
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var _line;
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function newLine() {
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_line = document.createElement('div');
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_line.classList.add('line');
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_line.innerText = _lineBuffer;
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paper.append(_line);
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_lineBuffer = '';
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}
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newLine();
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return {
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putChar: function(val) {
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var ascii = val & 0x7f;
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var visible = val >= 0x20;
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var c = String.fromCharCode(ascii);
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if (c === '\r') {
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newLine();
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} else if (c === '\n') {
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// eat for now
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} else if (c === '\t') {
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_lineBuffer += ' ';
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} else if (ascii === 0x04) {
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_lineBuffer = _lineBuffer.slice(0, -1);
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} else if (visible) {
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_lineBuffer += c;
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}
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_line.innerText = _lineBuffer;
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},
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clear: function() {
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_lineBuffer = '';
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paper.innerHTML = "";
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newLine();
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},
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hasPrintout: function() {
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return paper.text.length;
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}
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};
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}
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