GUI 강의 5

계산기 만들기 

이 형태를 

이 형태로 바꿔보자

중간 과정

 

import sys
from PyQt5.QtWidgets import *

class Main(QDialog):
    def __init__(self):
        super().__init__()
        self.init_ui()

    def init_ui(self):
        main_layout =QVBoxLayout()

        #레이아웃 틀 잡기

        layout_operation = QHBoxLayout()
        layout_clear_equal = QHBoxLayout()
        layout_number = QGridLayout()
        layout_equation_solution = QFormLayout()

        ### equation , solution ###
        self.equation = QLineEdit()
        self.solution = QLineEdit()
        layout_equation_solution.addRow("Equation: ",self.equation)
        layout_equation_solution.addRow("Solytion:" ,self.solution)

        ### + = * / opeation ###
        button_plus =QPushButton("+")
        button_minus =QPushButton("-")
        button_product =QPushButton("*")
        button_devision =QPushButton("/")



        layout_operation.addWidget(button_plus)
        layout_operation.addWidget(button_minus)
        layout_operation.addWidget(button_product)
        layout_operation.addWidget(button_devision)


        ###clear , equal = ###
        button_clear = QPushButton("Clear")
        button_equal=QPushButton("=")

        layout_clear_equal.addWidget(button_clear)
        layout_clear_equal.addWidget(button_equal)

        ### number button ###
        number_button_dicct ={}
        for number in range(0,10):
            number_button_dicct[number] = QPushButton(str(number))
            if number>0:
                x,y = divmod(number-1,3)
                 # 3으로 나눴을 때 몫과 나머지에 따라 배치를 하면 된다.
                layout_number.addWidget(number_button_dicct[number], x, y)
            elif number ==0:
                layout_number.addWidget(number_button_dicct[number],3,1)



        main_layout.addLayout(layout_equation_solution)
        main_layout.addLayout(layout_operation)
        main_layout.addLayout(layout_clear_equal)
        main_layout.addLayout(layout_number)

        self.setLayout(main_layout)
        self.resize(400, 400)
        self.show()


if __name__ =='__main__':
    app = QApplication(sys.argv)
    main = Main()
    sys.exit(app.exec_())

---

이벤트 추가하기

### 이벤트 추가하기  ###
button_plus.clicked.connect(self.button_plus_click)

### 이벤트 추가하기  ###
button_plus.clicked.connect(self.button_plus_clicked)
button_minus.clicked.connect(self.button_minus_clicked)
button_product.clicked.connect(self.button_product_clicked)
button_devision.clicked.connect(self.button_devision_clicked)

layout_operation.addWidget(button_plus)
layout_operation.addWidget(button_minus)
layout_operation.addWidget(button_product)
layout_operation.addWidget(button_devision)

def button_plus_clicked(self):
    #현재 equation 따오기
    equation = self.equation.text()
    equation += '+'
    self.equation.setText(equation)

def button_minus_clicked(self):
        # 현재 equation 따오기
        equation = self.equation.text()
        equation += '-'
        self.equation.setText(equation)

def button_product_clicked(self):
            # 현재 equation 따오기
            equation = self.equation.text()
            equation += '*'
            self.equation.setText(equation)

def button_devision_clicked(self):
                # 현재 equation 따오기
                equation = self.equation.text()
                equation += '/'
                self.equation.setText(equation)

 

---

숫자 버튼 누르면 Equation에 뜨도록

number_button_dicct[number].clicked.connect(lambda state, num=number: self.number_button_click(num))

def number_button_click(self,num):
    equation = self.equation.text()
    equation+=str(num)
    self.equation.setText(equation)

 

 

---

equal 기능

eval(수식) -> 수식을 계산한 값을 return한다. 

button_equal.clicked.connect(self.button_equal_click)

def button_equal_click(self):
    equation = self.equation.text()
    solution = eval(equation)
    self.solution.setText(str(solution))

 

---

clear 버튼 기능 추가

이 상태에서 clear 버튼을 누르면

짠

---

기능 수정

#람다 함수
button_plus.clicked.connect(lambda state, operation="+":self.button_operation_clicked(operation))
button_minus.clicked.connect(lambda state, operation="-":self.button_operation_clicked(operation))
button_product.clicked.connect(lambda state, operation="*":self.button_operation_clicked(operation))
button_devision.clicked.connect(lambda state, operation="/":self.button_operation_clicked(operation))

def button_operation_clicked(self,operation):
    #현재 equation 따오기
    equation = self.equation.text()
    equation += operation
    self.equation.setText(equation)

사칙연산 기능을 람다 함수 이용해서 수정해주었다.