346 lines
8.7 KiB
TypeScript
346 lines
8.7 KiB
TypeScript
// pages/calculator/calculator.ts
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Page({
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data: {
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displayValue: '0',
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history: '',
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operator: null as string | null,
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firstOperand: null as number | null,
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waitingForSecondOperand: false,
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isScientific: false,
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showHistory: false,
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showHelp: false,
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showSettingsMenu: false,
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historyList: [] as Array<{expression: string, result: string}>
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},
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onShareAppMessage() {
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return {
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title: '便捷好用的科学计算器',
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path: '/pages/calculator/calculator'
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}
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},
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onShareTimeline() {
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return {
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title: '便捷好用的科学计算器'
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}
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},
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toggleHelp() {
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this.setData({
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showHelp: !this.data.showHelp,
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showSettingsMenu: false
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});
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},
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toggleSettings() {
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this.vibrate();
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this.setData({ showSettingsMenu: !this.data.showSettingsMenu });
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},
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closeSettings() {
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if (this.data.showSettingsMenu) {
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this.setData({ showSettingsMenu: false });
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}
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},
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onLoad() {
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// 从本地存储恢复历史记录
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const saved = wx.getStorageSync('CALC_HISTORY');
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if (saved && Array.isArray(saved)) {
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this.setData({ historyList: saved });
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}
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},
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vibrate() {
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wx.vibrateShort({ type: 'light' }).catch(() => {});
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},
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preventTouchMove() {
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// 阻止历史面板底层滚动
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},
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toggleMode() {
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this.vibrate();
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this.setData({
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isScientific: !this.data.isScientific
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});
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},
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switchMode(e: any) {
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const mode = e.currentTarget.dataset.mode;
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const isSci = (mode === 'scientific');
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if (this.data.isScientific !== isSci) {
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this.vibrate();
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this.setData({ isScientific: isSci });
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}
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},
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onDigit(e: any) {
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this.vibrate();
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const digit = e.currentTarget.dataset.digit;
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const { displayValue, waitingForSecondOperand } = this.data;
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// 科学模式允许更多数字
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const limit = 15;
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if (!waitingForSecondOperand && displayValue.length >= limit) {
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return;
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}
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if (waitingForSecondOperand) {
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this.setData({
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displayValue: digit,
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waitingForSecondOperand: false
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});
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} else {
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this.setData({
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displayValue: displayValue === '0' ? digit : displayValue + digit
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});
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}
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},
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onDot() {
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this.vibrate();
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const { displayValue, waitingForSecondOperand } = this.data;
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if (waitingForSecondOperand) {
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this.setData({
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displayValue: '0.',
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waitingForSecondOperand: false
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});
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} else if (displayValue.indexOf('.') === -1) {
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this.setData({
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displayValue: displayValue + '.'
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});
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}
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},
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onClear() {
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this.vibrate();
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this.setData({
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displayValue: '0',
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history: '',
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operator: null,
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firstOperand: null,
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waitingForSecondOperand: false
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});
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},
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onDelete() {
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this.vibrate();
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const { displayValue } = this.data;
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if (displayValue.length > 1) {
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this.setData({
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displayValue: displayValue.slice(0, -1)
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});
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} else {
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this.setData({ displayValue: '0' });
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}
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},
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onToggleSign() {
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this.vibrate();
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const { displayValue } = this.data;
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const newValue = parseFloat(displayValue) * -1;
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this.setData({
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displayValue: String(newValue)
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});
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},
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onConstant(e: any) {
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this.vibrate();
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const type = e.currentTarget.dataset.const;
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let val = 0;
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if (type === 'pi') val = Math.PI;
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if (type === 'e') val = Math.E;
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this.setData({
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displayValue: String(val).slice(0, 10),
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waitingForSecondOperand: true // 下次输入将开启新数字，或者作为操作数
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});
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},
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onMathFunc(e: any) { // 单操作数立即计算
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this.vibrate();
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const func = e.currentTarget.dataset.func;
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let val = parseFloat(this.data.displayValue);
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let result = 0;
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let desc = '';
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switch(func) {
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case 'sin':
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// 默认转为弧度计算 (度数 * PI / 180)
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result = Math.sin(val * Math.PI / 180);
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desc = `sin(${val})`;
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break;
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case 'cos':
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result = Math.cos(val * Math.PI / 180);
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desc = `cos(${val})`;
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break;
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case 'tan':
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result = Math.tan(val * Math.PI / 180);
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desc = `tan(${val})`;
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break;
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case 'log':
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result = Math.log10(val);
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desc = `log(${val})`;
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break;
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case 'ln':
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result = Math.log(val);
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desc = `ln(${val})`;
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break;
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case 'sqrt':
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result = Math.sqrt(val);
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desc = `√(${val})`;
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break;
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case 'pow2':
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result = Math.pow(val, 2);
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desc = `sqr(${val})`;
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break;
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case 'percent':
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result = val / 100;
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desc = `${val}%`;
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break;
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}
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// 格式化结果
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const formatted = parseFloat(result.toPrecision(12));
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this.setData({
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displayValue: String(formatted),
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history: desc,
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waitingForSecondOperand: true // 计算完后，下次输入数字是新数字
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});
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this.addToHistory(desc, String(formatted));
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},
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onOperator(e: any) {
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this.vibrate();
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const nextOperator = e.currentTarget.dataset.op;
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const { displayValue, operator, firstOperand } = this.data;
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const inputValue = parseFloat(displayValue);
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if (operator && this.data.waitingForSecondOperand) {
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this.setData({
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operator: nextOperator,
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// 更新历史记录中的符号
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history: `${firstOperand} ${nextOperator}`
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});
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return;
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}
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let newFirstOperand = firstOperand;
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if (firstOperand == null) {
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newFirstOperand = inputValue;
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} else if (operator) {
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const result = this.performCalculation(operator, firstOperand, inputValue);
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newFirstOperand = result;
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this.setData({
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displayValue: String(result),
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});
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}
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this.setData({
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firstOperand: newFirstOperand,
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waitingForSecondOperand: true,
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operator: nextOperator,
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history: `${newFirstOperand} ${nextOperator}`
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});
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},
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onEqual() {
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this.vibrate();
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const { displayValue, operator, firstOperand } = this.data;
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const inputValue = parseFloat(displayValue);
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if (operator && firstOperand != null) {
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const result = this.performCalculation(operator, firstOperand, inputValue);
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const expression = `${firstOperand} ${operator} ${inputValue}`;
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this.setData({
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displayValue: String(result),
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firstOperand: null,
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operator: null,
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waitingForSecondOperand: true,
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history: `${firstOperand} ${operator} ${inputValue} =`
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});
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this.addToHistory(expression, String(result));
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}
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},
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performCalculation(op: string, first: number, second: number): number {
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let result = 0;
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switch(op) {
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case '+': result = first + second; break;
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case '-': result = first - second; break;
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case '×': result = first * second; break;
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case '÷': result = first / second; break;
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default: return second;
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}
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const precision = 10000000000;
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return Math.round(result * precision) / precision;
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},
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// 历史记录相关方法
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addToHistory(expression: string, result: string) {
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const list = this.data.historyList.slice();
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list.unshift({ expression, result });
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// 最多保留50条
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if (list.length > 50) list.length = 50;
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this.setData({ historyList: list });
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wx.setStorageSync('CALC_HISTORY', list);
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},
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toggleHistory() {
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this.vibrate();
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this.setData({
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showHistory: !this.data.showHistory,
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showSettingsMenu: false
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});
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},
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clearHistory() {
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this.vibrate();
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wx.removeStorageSync('CALC_HISTORY');
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this.setData({ historyList: [] });
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},
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useHistoryResult(e: any) {
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this.vibrate();
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const result = e.currentTarget.dataset.result;
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this.setData({
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displayValue: result,
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waitingForSecondOperand: false, // Treat as a fresh input that can be operated on
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showHistory: false
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});
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},
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copyResult() {
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this.vibrate();
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const { displayValue } = this.data;
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wx.setClipboardData({
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data: displayValue,
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success: () => {
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wx.showToast({
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title: '复制成功',
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icon: 'success'
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});
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},
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fail: (err) => {
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console.error('复制失败:', err);
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// 隐私协议未声明或用户拒绝会导致复制失败 (errno 112)
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if (err.errno === 112 || (err.errMsg && err.errMsg.indexOf('privacy') > -1)) {
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wx.showModal({
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title: '提示',
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content: '无法自动复制，请长按显示区域手动复制',
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showCancel: false,
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confirmText: '知道了'
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});
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}
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}
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});
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}
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});
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