modern-calculator/calculator.py

import sys
from PyQt6.QtWidgets import (
    QApplication,
    QMainWindow,
    QWidget,
    QGridLayout,
    QPushButton,
    QLineEdit,
)
from PyQt6.QtCore import Qt
from PyQt6.QtGui import QKeyEvent


class Calculator(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("现代计算器")
        self.setFixedSize(400, 500)
        self.setStyleSheet(
            """
            QMainWindow {
                background-color: #f0f0f0;
            }
            QLineEdit {
                background-color: white;
                border: 2px solid #e0e0e0;
                border-radius: 8px;
                padding: 10px;
                margin: 10px;
                font-size: 24px;
                color: #333;
            }
            QPushButton {
                background-color: white;
                border: none;
                border-radius: 20px;
                padding: 20px;
                margin: 5px;
                font-size: 18px;
                color: #333;
            }
            QPushButton:hover {
                background-color: #e0e0e0;
            }
            QPushButton:pressed {
                background-color: #d0d0d0;
            }
            QPushButton[type="operator"] {
                background-color: #FF9500;
                color: white;
            }
            QPushButton[type="operator"]:hover {
                background-color: #FFa530;
            }
            QPushButton[type="equal"] {
                background-color: #007AFF;
                color: white;
            }
            QPushButton[type="equal"]:hover {
                background-color: #0090FF;
            }
            QPushButton[type="clear"] {
                background-color: #FF3B30;
                color: white;
            }
            QPushButton[type="clear"]:hover {
                background-color: #FF4B40;
            }
        """
        )

        # 创建中心部件和网格布局
        central_widget = QWidget()
        self.setCentralWidget(central_widget)
        grid = QGridLayout(central_widget)
        grid.setSpacing(10)
        grid.setContentsMargins(20, 20, 20, 20)

        # 创建显示结果的文本框
        self.display = QLineEdit()
        self.display.setReadOnly(True)
        self.display.setAlignment(Qt.AlignmentFlag.AlignRight)
        self.display.setMaxLength(15)
        self.display.setMinimumHeight(80)
        self.display.setText("0")
        grid.addWidget(self.display, 0, 0, 1, 4)

        # 按钮文本和它们的位置
        buttons = {
            "C": (1, 0, "clear"),
            "±": (1, 1, "operator"),
            "%": (1, 2, "operator"),
            "/": (1, 3, "operator"),
            "7": (2, 0, "number"),
            "8": (2, 1, "number"),
            "9": (2, 2, "number"),
            "*": (2, 3, "operator"),
            "4": (3, 0, "number"),
            "5": (3, 1, "number"),
            "6": (3, 2, "number"),
            "-": (3, 3, "operator"),
            "1": (4, 0, "number"),
            "2": (4, 1, "number"),
            "3": (4, 2, "number"),
            "+": (4, 3, "operator"),
            "0": (5, 0, "number"),
            ".": (5, 2, "number"),
            "=": (5, 3, "equal"),
        }

        # 创建并添加按钮
        for button_text, (row, col, button_type) in buttons.items():
            button = QPushButton(button_text)
            button.setProperty("type", button_type)
            button.clicked.connect(self.button_clicked)
            if button_text == "0":
                grid.addWidget(button, row, col, 1, 2)
            else:
                grid.addWidget(button, row, col)

        # 添加按键映射字典
        self.key_mapping = {
            Qt.Key.Key_0: "0",
            Qt.Key.Key_1: "1",
            Qt.Key.Key_2: "2",
            Qt.Key.Key_3: "3",
            Qt.Key.Key_4: "4",
            Qt.Key.Key_5: "5",
            Qt.Key.Key_6: "6",
            Qt.Key.Key_7: "7",
            Qt.Key.Key_8: "8",
            Qt.Key.Key_9: "9",
            Qt.Key.Key_Plus: "+",
            Qt.Key.Key_Minus: "-",
            Qt.Key.Key_Asterisk: "*",
            Qt.Key.Key_Slash: "/",
            Qt.Key.Key_Period: ".",
            Qt.Key.Key_Return: "=",
            Qt.Key.Key_Enter: "=",
            Qt.Key.Key_Equal: "=",
            Qt.Key.Key_Escape: "C",
            Qt.Key.Key_Percent: "%",
        }

    def keyPressEvent(self, event: QKeyEvent) -> None:
        """处理键盘按键事件"""
        key = event.key()

        # 处理数字键盘的输入
        if event.modifiers() == Qt.KeyboardModifier.KeypadModifier:
            if key == Qt.Key.Key_Plus:
                self.process_input("+")
            elif key == Qt.Key.Key_Minus:
                self.process_input("-")
            elif key == Qt.Key.Key_Asterisk:
                self.process_input("*")
            elif key == Qt.Key.Key_Slash:
                self.process_input("/")
            elif key == Qt.Key.Key_Enter:
                self.process_input("=")
            elif key == Qt.Key.Key_Period:
                self.process_input(".")

        # 处理普通键盘的输入
        if key in self.key_mapping:
            self.process_input(self.key_mapping[key])

        # 处理退格键
        elif key == Qt.Key.Key_Backspace:
            current_text = self.display.text()
            self.display.setText(current_text[:-1])

        super().keyPressEvent(event)

    def process_input(self, value: str) -> None:
        """统一处理输入"""
        if value == "=":
            self.calculate_result()
        elif value == "C":
            self.display.setText("0")
        else:
            current_text = self.display.text()
            if current_text == "0":
                self.display.setText(value)
            else:
                new_text = current_text + value
                self.display.setText(new_text)

    def calculate_result(self) -> None:
        """计算结果"""
        try:
            current_text = self.display.text()
            # 处理百分号
            expression = current_text.replace("%", "/100")
            # 处理正负号
            expression = expression.replace("±", "-")
            result = str(eval(expression))
            self.display.setText(result)
        except:
            self.display.setText("错误")

    def button_clicked(self):
        """处理按钮点击事件"""
        button = self.sender()
        button_text = button.text()
        self.process_input(button_text)


def main():
    app = QApplication(sys.argv)
    calculator = Calculator()
    calculator.show()
    sys.exit(app.exec())


if __name__ == "__main__":
    main()