matmoul
07a4c533fb
Keep the calculator stack unlimited in the demo and only constrain the rendered stack view. Also restore the edit cursor position when pulling a value into the input from the stack.
572 lines
16 KiB
JavaScript
572 lines
16 KiB
JavaScript
const calc = new RpnCalculator({ angleMode: 'deg' });
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const hiddenInput = document.getElementById('hiddenInput');
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const modeButton = document.getElementById('modeButton');
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const pasteButton = document.getElementById('pasteButton');
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const upButton = document.getElementById('upButton');
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const constButton = document.getElementById('constButton');
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const leftButton = document.getElementById('leftButton');
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const downButton = document.getElementById('downButton');
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const rightButton = document.getElementById('rightButton');
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const stackEls = {
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T: document.getElementById('stackT'),
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Z: document.getElementById('stackZ'),
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Y: document.getElementById('stackY'),
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X: document.getElementById('stackX'),
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};
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const stackCopyButtons = {
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T: document.querySelector('[data-copy-stack="T"]'),
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Z: document.querySelector('[data-copy-stack="Z"]'),
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Y: document.querySelector('[data-copy-stack="Y"]'),
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X: document.querySelector('[data-copy-stack="X"]'),
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};
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const keypadGrid = document.getElementById('keypadGrid');
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const functionsGrid = document.getElementById('functionsGrid');
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const trigoGrid = document.getElementById('trigoGrid');
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const calculatorEl = document.querySelector('.calculator');
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const statusLine = document.getElementById('statusLine');
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const keypadKeys = [
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{ label: 'C', action: 'clear', className: 'key-danger' },
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{ label: '⌫', action: 'backspace', className: 'key-danger' },
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{ label: '⎋', action: 'escape', className: 'key-escape' },
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{ label: '⏎', action: 'enter', className: 'key-enter' },
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{ label: '7', input: '7', className: 'key-default' },
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{ label: '8', input: '8', className: 'key-default' },
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{ label: '9', input: '9', className: 'key-default' },
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{ label: '÷', action: 'div', className: 'key-accent' },
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{ label: '4', input: '4', className: 'key-default' },
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{ label: '5', input: '5', className: 'key-default' },
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{ label: '6', input: '6', className: 'key-default' },
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{ label: '×', action: 'mul', className: 'key-accent' },
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{ label: '1', input: '1', className: 'key-default' },
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{ label: '2', input: '2', className: 'key-default' },
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{ label: '3', input: '3', className: 'key-default' },
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{ label: '−', action: 'sub', className: 'key-accent' },
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{ label: '0', input: '0', className: 'key-default' },
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{ label: '.', input: '.', className: 'key-default' },
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{ label: '±', action: 'neg', className: 'key-default' },
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{ label: '+', action: 'add', className: 'key-accent' },
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];
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const functionKeys = [
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{ label: 'x²', action: 'sqr', className: 'key-default' },
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{ label: 'yˣ', action: 'pow', className: 'key-default' },
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{ label: '1/x', action: 'recip', className: 'key-default' },
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{ label: '%', action: 'mod', className: 'key-default' },
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{ label: '√x', action: 'sqrt', className: 'key-default' },
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{ label: 'y√x', action: 'root', className: 'key-default' },
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{ label: '10ˣ', action: 'pow10', className: 'key-default' },
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{ label: '', spacer: true },
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{ label: 'log', action: 'log', className: 'key-default' },
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{ label: 'ln', action: 'ln', className: 'key-default' },
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{ label: 'eˣ', action: 'exp', className: 'key-default' },
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{ label: '', spacer: true },
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];
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const trigoKeys = [
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{ label: 'sin', action: 'sin', className: 'key-default' },
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{ label: 'cos', action: 'cos', className: 'key-default' },
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{ label: 'tan', action: 'tan', className: 'key-default' },
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{ label: '', spacer: true },
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{ label: 'asin', action: 'asin', className: 'key-default' },
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{ label: 'acos', action: 'acos', className: 'key-default' },
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{ label: 'atan', action: 'atan', className: 'key-default' },
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{ label: '', spacer: true },
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];
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const isTouchDevice = window.matchMedia('(pointer: coarse)').matches || 'ontouchstart' in window;
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function focusInput() {
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if (!hiddenInput || isTouchDevice) return;
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hiddenInput.focus({ preventScroll: true });
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window.requestAnimationFrame(() => {
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if (document.activeElement !== hiddenInput) {
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hiddenInput.focus({ preventScroll: true });
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}
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if (typeof hiddenInput.select === 'function') {
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hiddenInput.select();
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}
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});
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}
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let statusTimer = null;
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let editCursor = 0;
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function setStatus(message, isError = false, timeoutMs = 1400) {
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if (!statusLine) return;
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clearTimeout(statusTimer);
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statusLine.textContent = message;
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statusLine.classList.toggle('is-error', isError);
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statusLine.classList.toggle('is-visible', Boolean(message));
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if (!message || timeoutMs <= 0) return;
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statusTimer = window.setTimeout(() => {
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statusLine.textContent = '';
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statusLine.classList.remove('is-visible');
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statusLine.classList.remove('is-error');
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}, timeoutMs);
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}
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function clearStatus() {
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clearTimeout(statusTimer);
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statusTimer = null;
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if (!statusLine) return;
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statusLine.textContent = '';
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statusLine.classList.remove('is-visible');
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statusLine.classList.remove('is-error');
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}
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function normalizeStack() {
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// Demo display only shows the top 4 stack values; the calculator stack remains unlimited.
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}
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function getStackLine(indexFromTop) {
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return indexFromTop >= 0 && indexFromTop < calc.stack.length ? calc.stack[indexFromTop] : '';
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}
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function getEditingDisplayValue() {
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if (!calc.isEditing) return '';
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return calc.inputValue;
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}
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function getStackDisplayValue(label) {
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if (label === 'X') {
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return calc.isEditing ? getEditingDisplayValue() : (calc.formatNumber(getStackLine(0)) || '');
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}
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if (label === 'Y') {
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return calc.isEditing ? (calc.formatNumber(getStackLine(0)) || '') : (calc.formatNumber(getStackLine(1)) || '');
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}
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if (label === 'Z') {
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return calc.isEditing ? (calc.formatNumber(getStackLine(1)) || '') : (calc.formatNumber(getStackLine(2)) || '');
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}
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return calc.isEditing ? (calc.formatNumber(getStackLine(2)) || '') : (calc.formatNumber(getStackLine(3)) || '');
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}
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function updateCopyButtons() {
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for (const label of ['T', 'Z', 'Y', 'X']) {
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const value = getStackDisplayValue(label);
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const button = stackCopyButtons[label];
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if (!button) continue;
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button.classList.toggle('is-visible', Boolean(value));
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button.disabled = !value;
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button.setAttribute('aria-hidden', value ? 'false' : 'true');
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}
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}
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function render() {
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const isPortrait = window.matchMedia('(orientation: portrait)').matches || window.innerWidth <= 860;
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calculatorEl?.classList.toggle('portrait', isPortrait);
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calculatorEl?.classList.toggle('landscape', !isPortrait);
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const xValue = getStackDisplayValue('X');
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if (calc.isEditing) {
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const cursor = Math.max(0, Math.min(editCursor, calc.inputValue.length));
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stackEls.X.innerHTML = `<span class="edit-text">${calc.inputValue.slice(0, cursor)}</span><span class="edit-caret" aria-hidden="true"></span><span class="edit-text">${calc.inputValue.slice(cursor)}</span>`;
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} else {
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stackEls.X.textContent = xValue;
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}
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stackEls.Y.textContent = getStackDisplayValue('Y');
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stackEls.Z.textContent = getStackDisplayValue('Z');
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stackEls.T.textContent = getStackDisplayValue('T');
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stackEls.X.classList.toggle('is-editing', calc.isEditing);
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stackEls.X.classList.toggle('is-caret-visible', calc.isEditing);
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updateCopyButtons();
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modeButton.textContent = calc.angleMode;
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}
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function stopEditing(clearValue = false) {
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if (clearValue) {
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calc.inputValue = '';
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}
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calc.isEditing = false;
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editCursor = 0;
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}
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function pushEditingValueIfNeeded() {
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if (!calc.isEditing) return;
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if (calc.inputValue !== '') {
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calc.push(calc.parseInputValue(calc.inputValue));
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}
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calc.inputValue = '';
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calc.isEditing = false;
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editCursor = 0;
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}
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function inputToX(value) {
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if (!calc.isEditing) {
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calc.isEditing = true;
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calc.inputValue = '';
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editCursor = 0;
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}
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if (value === 'Backspace') {
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if (editCursor > 0) {
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calc.inputValue = `${calc.inputValue.slice(0, editCursor - 1)}${calc.inputValue.slice(editCursor)}`;
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editCursor -= 1;
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}
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} else {
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calc.inputValue = `${calc.inputValue.slice(0, editCursor)}${value}${calc.inputValue.slice(editCursor)}`;
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editCursor += value.length;
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}
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if (calc.inputValue === '') {
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calc.isEditing = false;
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editCursor = 0;
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}
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}
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function pasteTextIntoStack(text) {
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if (!text) {
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setStatus('Clipboard empty');
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return;
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}
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const value = calc.parseInputValue(text);
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if (!Number.isFinite(value)) {
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setStatus('Clipboard is not a number');
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return;
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}
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pushEditingValueIfNeeded();
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calc.push(value);
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calc.isEditing = false;
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calc.inputValue = '';
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setStatus('Pasted');
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render();
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}
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function execute(name) {
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try {
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if (name === 'enter') {
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if (calc.isEditing) {
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pushEditingValueIfNeeded();
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} else if (calc.isValidIndex(0)) {
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calc.push(calc.stack[0]);
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}
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} else if (name === 'clear') {
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calc.clear();
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stopEditing(true);
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} else if (name === 'escape') {
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stopEditing(true);
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} else if (name === 'backspace') {
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if (calc.isEditing) {
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inputToX('Backspace');
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} else if (calc.isValidIndex(0)) {
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calc.remove(0);
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}
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} else if (name === 'swap') {
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pushEditingValueIfNeeded();
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if (calc.isValidIndex(1)) {
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calc.swap(0, 1);
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}
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} else if (name === 'neg') {
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if (calc.isEditing) {
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const hasSign = calc.inputValue.startsWith('-');
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calc.inputValue = hasSign ? calc.inputValue.slice(1) : `-${calc.inputValue}`;
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if (!hasSign) editCursor += 1;
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if (hasSign) editCursor = Math.max(0, editCursor - 1);
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editCursor = Math.max(0, Math.min(editCursor, calc.inputValue.length));
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} else {
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calc.command('neg');
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}
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} else {
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pushEditingValueIfNeeded();
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calc.command(name);
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}
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if (!calc.isEditing) {
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editCursor = 0;
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}
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render();
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} catch (error) {
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setStatus(error?.message || 'Operation error', true);
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}
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}
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function createKeyButton({ label, input, action, spacer, className }) {
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if (spacer) {
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const div = document.createElement('div');
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return div;
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}
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const button = document.createElement('button');
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button.type = 'button';
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button.textContent = label;
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button.className = className;
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button.addEventListener('click', () => {
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if (input) {
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inputToX(input);
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render();
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return;
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}
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execute(action);
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});
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return button;
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}
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function buildGrid(container, keys) {
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container.innerHTML = '';
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keys.forEach((key) => container.appendChild(createKeyButton(key)));
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}
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async function copyStackValue(label) {
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const value = getStackDisplayValue(label);
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if (!value) return;
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try {
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await navigator.clipboard.writeText(value);
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clearStatus();
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} catch (error) {
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setStatus('Copy unavailable', true);
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}
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}
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function handleKeyboard(event) {
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if (event.defaultPrevented) return;
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const key = event.key;
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if (/^[0-9.]$/.test(key)) {
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event.preventDefault();
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inputToX(key);
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render();
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return;
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}
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const map = {
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Enter: 'enter',
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Backspace: 'backspace',
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Escape: 'escape',
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Delete: 'clear',
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'+': 'add',
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'-': 'sub',
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'*': 'mul',
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'/': 'div',
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'%': 'mod',
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'^': 'pow',
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};
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if (key === 'ArrowLeft') {
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event.preventDefault();
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if (calc.isEditing) {
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editCursor = Math.max(0, editCursor - 1);
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render();
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return;
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}
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leftButton.click();
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return;
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}
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if (key === 'ArrowRight') {
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event.preventDefault();
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if (calc.isEditing) {
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editCursor = Math.min(calc.inputValue.length, editCursor + 1);
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render();
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return;
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}
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rightButton.click();
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return;
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}
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if (key === 'ArrowUp') {
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event.preventDefault();
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upButton.click();
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return;
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}
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if (key === 'ArrowDown') {
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event.preventDefault();
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downButton.click();
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return;
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}
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if (map[key]) {
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event.preventDefault();
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execute(map[key]);
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}
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}
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const modeOptions = ['deg', 'rad', 'grad'];
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let activeMenuEl = null;
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function closeModeMenu() {
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if (activeMenuEl) {
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activeMenuEl.remove();
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activeMenuEl = null;
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}
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}
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function openMenu(anchorButton, items, onSelect) {
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const rect = anchorButton.getBoundingClientRect();
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const menu = document.createElement('div');
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menu.className = 'menu-popup';
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menu.style.top = `${rect.bottom + 6 + window.scrollY}px`;
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menu.style.left = `${rect.left + window.scrollX}px`;
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menu.style.minWidth = `${rect.width}px`;
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for (const item of items) {
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const button = document.createElement('button');
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button.type = 'button';
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button.className = `menu-popup-item${item.active ? ' is-active' : ''}`;
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button.textContent = item.label;
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button.addEventListener('click', () => onSelect(item.value));
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menu.appendChild(button);
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}
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document.body.appendChild(menu);
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return menu;
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}
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function toggleModeMenu() {
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if (activeMenuEl) {
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closeModeMenu();
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return;
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}
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closeConstMenu();
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activeMenuEl = openMenu(modeButton, modeOptions.map((mode) => ({
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label: mode,
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value: mode,
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active: mode === calc.angleMode,
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})), (mode) => {
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calc.angleMode = mode;
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render();
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closeModeMenu();
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});
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}
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modeButton.addEventListener('click', (event) => {
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event.stopPropagation();
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toggleModeMenu();
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});
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window.addEventListener('resize', () => {
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closeModeMenu();
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closeConstMenu();
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render();
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});
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window.addEventListener('scroll', () => {
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closeModeMenu();
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closeConstMenu();
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}, true);
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window.addEventListener('click', (event) => {
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const stackCopyButton = event.target.closest('.stack-copy-button');
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if (stackCopyButton) {
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const label = stackCopyButton.dataset.copyStack;
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if (label) copyStackValue(label);
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return;
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}
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if (activeMenuEl && !event.target.closest('.menu-popup') && event.target !== modeButton && event.target !== constButton) {
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closeModeMenu();
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closeConstMenu();
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}
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});
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pasteButton.addEventListener('click', async () => {
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try {
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const text = await navigator.clipboard.readText();
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pasteTextIntoStack(text);
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clearStatus();
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} catch (error) {
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setStatus('Paste unavailable', true);
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}
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});
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hiddenInput.addEventListener('paste', (event) => {
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event.preventDefault();
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const text = event.clipboardData?.getData('text') ?? '';
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pasteTextIntoStack(text);
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});
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upButton.addEventListener('click', () => {});
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const constantLabels = {
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pi: 'π',
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e: 'e',
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phi: 'φ',
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g: 'g',
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c: 'c',
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};
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const constantOrder = ['pi', 'e', 'phi', 'g', 'c'];
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function closeConstMenu() {
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if (activeMenuEl) {
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activeMenuEl.remove();
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activeMenuEl = null;
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}
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}
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function toggleConstMenu() {
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if (activeMenuEl) {
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closeConstMenu();
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return;
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}
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closeModeMenu();
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const availableConstants = calc.listConstants();
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const keys = [...constantOrder, ...Object.keys(availableConstants).filter((name) => !constantOrder.includes(name))]
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.filter((name) => Object.prototype.hasOwnProperty.call(availableConstants, name));
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activeMenuEl = openMenu(constButton, keys.map((name) => ({
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label: constantLabels[name] ?? name,
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value: name,
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})), (name) => {
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pushEditingValueIfNeeded();
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calc.push(availableConstants[name]);
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render();
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clearStatus();
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closeConstMenu();
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focusInput();
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});
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}
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constButton.addEventListener('click', (event) => {
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event.stopPropagation();
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toggleConstMenu();
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});
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leftButton.addEventListener('click', () => {
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if (calc.isEditing) {
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editCursor = Math.max(0, editCursor - 1);
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render();
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||
focusInput();
|
||
}
|
||
});
|
||
downButton.addEventListener('click', () => {
|
||
if (!calc.isEditing && calc.isValidIndex(0)) {
|
||
const value = calc.stack[0];
|
||
calc.remove(0);
|
||
calc.isEditing = true;
|
||
calc.inputValue = calc.formatNumber(value);
|
||
editCursor = calc.inputValue.length;
|
||
render();
|
||
focusInput();
|
||
}
|
||
});
|
||
|
||
|
||
rightButton.addEventListener('click', () => {
|
||
if (calc.isEditing) {
|
||
editCursor = Math.min(calc.inputValue.length, editCursor + 1);
|
||
render();
|
||
focusInput();
|
||
return;
|
||
}
|
||
execute('swap');
|
||
});
|
||
|
||
window.addEventListener('keydown', handleKeyboard, { capture: true });
|
||
window.addEventListener('load', focusInput);
|
||
window.addEventListener('pageshow', focusInput);
|
||
window.addEventListener('focus', focusInput);
|
||
window.addEventListener('pointerdown', focusInput, true);
|
||
window.addEventListener('mousedown', focusInput, true);
|
||
|
||
hiddenInput.setAttribute('inputmode', 'none');
|
||
hiddenInput.setAttribute('readonly', 'readonly');
|
||
hiddenInput.addEventListener('focus', () => {
|
||
if (isTouchDevice) {
|
||
hiddenInput.blur();
|
||
return;
|
||
}
|
||
window.requestAnimationFrame(() => {
|
||
hiddenInput.select();
|
||
});
|
||
});
|
||
|
||
document.addEventListener('click', (event) => {
|
||
if (!isTouchDevice && !event.target.closest('.menu-popup')) {
|
||
focusInput();
|
||
}
|
||
});
|
||
|
||
buildGrid(keypadGrid, keypadKeys);
|
||
buildGrid(functionsGrid, functionKeys);
|
||
buildGrid(trigoGrid, trigoKeys);
|
||
render();
|
||
focusInput();
|