โค้ดข้างล่างนี้เป็นตัวอย่างโปรแกรมคิดเลขครับ โดยมีความสามารถในการบวก ลบ คูณ หาร ยกกำลัง Sqrt 1/x เป็นต้นครับ ลอง ๆ แกะโค้ดกันดูนะครับ :D
โค้ด
import math
from PySide.QtCore import *
from PySide.QtGui import *
class Button(QToolButton):
def __init__(self, text, parent=None):
super(Button, self).__init__(parent)
self.setSizePolicy(QSizePolicy.Expanding,
QSizePolicy.Preferred)
self.setText(text)
def sizeHint(self):
size = super(Button, self).sizeHint()
size.setHeight(size.height() + 20)
size.setWidth(max(size.width(), size.height()))
return size
class Calculator(QDialog):
NumDigitButtons = 10
def __init__(self, parent=None):
super(Calculator, self).__init__(parent)
self.pendingAdditiveOperator = ''
self.pendingMultiplicativeOperator = ''
self.sumInMemory = 0.0
self.sumSoFar = 0.0
self.factorSoFar = 0.0
self.waitingForOperand = True
self.display = QLineEdit('0')
self.display.setReadOnly(True)
self.display.setAlignment(Qt.AlignRight)
self.display.setMaxLength(15)
font = self.display.font()
font.setPointSize(font.pointSize() + 8)
self.display.setFont(font)
self.digitButtons = []
for i in range(Calculator.NumDigitButtons):
self.digitButtons.append(self.createButton(str(i),
self.digitClicked))
self.pointButton = self.createButton(".", self.pointClicked) #เชื่อมต่อจุดกับปุ่ม
self.changeSignButton = self.createButton("\261",
self.changeSignClicked)
self.backspaceButton = self.createButton("Backspace",
self.backspaceClicked)
self.clearButton = self.createButton("Clear", self.clear)
self.clearAllButton = self.createButton("Clear All", self.clearAll)
self.clearMemoryButton = self.createButton("MC", self.clearMemory)
self.readMemoryButton = self.createButton("MR", self.readMemory)
self.setMemoryButton = self.createButton("MS", self.setMemory)
self.addToMemoryButton = self.createButton("M+", self.addToMemory)
self.divisionButton = self.createButton("\367",
self.multiplicativeOperatorClicked)
self.timesButton = self.createButton("\327",
self.multiplicativeOperatorClicked)
self.minusButton = self.createButton("-", self.additiveOperatorClicked)
self.plusButton = self.createButton("+", self.additiveOperatorClicked)
self.squareRootButton = self.createButton("Sqrt",
self.unaryOperatorClicked)
self.powerButton = self.createButton("x\262",
self.unaryOperatorClicked)
self.reciprocalButton = self.createButton("1/x",
self.unaryOperatorClicked)
self.equalButton = self.createButton("=", self.equalClicked)
mainLayout = QGridLayout()
mainLayout.setSizeConstraint(QLayout.SetFixedSize)
mainLayout.addWidget(self.display, 0, 0, 1, 6) #เพิ่ม Widget เข้ามา
mainLayout.addWidget(self.backspaceButton, 1, 0, 1, 2)
mainLayout.addWidget(self.clearButton, 1, 2, 1, 2)
mainLayout.addWidget(self.clearAllButton, 1, 4, 1, 2)
mainLayout.addWidget(self.clearMemoryButton, 2, 0)
mainLayout.addWidget(self.readMemoryButton, 3, 0)
mainLayout.addWidget(self.setMemoryButton, 4, 0)
mainLayout.addWidget(self.addToMemoryButton, 5, 0)
for i in range(1, Calculator.NumDigitButtons):
row = ((9 - i) / 3) + 2
column = ((i - 1) % 3) + 1
mainLayout.addWidget(self.digitButtons[i], row, column)
mainLayout.addWidget(self.digitButtons[0], 5, 1)
mainLayout.addWidget(self.pointButton, 5, 2)
mainLayout.addWidget(self.changeSignButton, 5, 3)
mainLayout.addWidget(self.divisionButton, 2, 4)
mainLayout.addWidget(self.timesButton, 3, 4)
mainLayout.addWidget(self.minusButton, 4, 4)
mainLayout.addWidget(self.plusButton, 5, 4)
mainLayout.addWidget(self.squareRootButton, 2, 5)
mainLayout.addWidget(self.powerButton, 3, 5)
mainLayout.addWidget(self.reciprocalButton, 4, 5)
mainLayout.addWidget(self.equalButton, 5, 5)
self.setLayout(mainLayout)
self.setWindowTitle("Calculator")
def digitClicked(self):
clickedButton = self.sender()
digitValue = int(clickedButton.text())
if self.display.text() == '0' and digitValue == 0.0:
return
if self.waitingForOperand:
self.display.clear()
self.waitingForOperand = False
self.display.setText(self.display.text() + str(digitValue))
def unaryOperatorClicked(self):
clickedButton = self.sender()
clickedOperator = clickedButton.text()
operand = float(self.display.text())
if clickedOperator == "Sqrt":
if operand < 0.0:
self.abortOperation()
return
result = math.sqrt(operand)
elif clickedOperator == "x\262":
result = math.pow(operand, 2.0)
elif clickedOperator == "1/x":
if operand == 0.0:
self.abortOperation()
return
result = 1.0 / operand
self.display.setText(str(result))
self.waitingForOperand = True
def additiveOperatorClicked(self):
clickedButton = self.sender()
clickedOperator = clickedButton.text()
operand = float(self.display.text())
if self.pendingMultiplicativeOperator:
if not self.calculate(operand, self.pendingMultiplicativeOperator):
self.abortOperation()
return
self.display.setText(str(self.factorSoFar))
operand = self.factorSoFar
self.factorSoFar = 0.0
self.pendingMultiplicativeOperator = ''
if self.pendingAdditiveOperator:
if not self.calculate(operand, self.pendingAdditiveOperator):
self.abortOperation()
return
self.display.setText(str(self.sumSoFar))
else:
self.sumSoFar = operand
self.pendingAdditiveOperator = clickedOperator
self.waitingForOperand = True
def multiplicativeOperatorClicked(self):
clickedButton = self.sender()
clickedOperator = clickedButton.text()
operand = float(self.display.text())
if self.pendingMultiplicativeOperator:
if not self.calculate(operand, self.pendingMultiplicativeOperator):
self.abortOperation()
return
self.display.setText(str(self.factorSoFar))
else:
self.factorSoFar = operand
self.pendingMultiplicativeOperator = clickedOperator
self.waitingForOperand = True
def equalClicked(self):
operand = float(self.display.text())
if self.pendingMultiplicativeOperator:
if not self.calculate(operand, self.pendingMultiplicativeOperator):
self.abortOperation()
return
operand = self.factorSoFar
self.factorSoFar = 0.0
self.pendingMultiplicativeOperator = ''
if self.pendingAdditiveOperator:
if not self.calculate(operand, self.pendingAdditiveOperator):
self.abortOperation()
return
self.pendingAdditiveOperator = ''
else:
self.sumSoFar = operand
self.display.setText(str(self.sumSoFar))
self.sumSoFar = 0.0
self.waitingForOperand = True
def pointClicked(self):
if self.waitingForOperand:
self.display.setText('0')
if "." not in self.display.text():
self.display.setText(self.display.text() + ".")
self.waitingForOperand = False
def changeSignClicked(self):
text = self.display.text()
value = float(text)
if value > 0.0:
text = "-" + text
elif value < 0.0:
text = text[1:]
self.display.setText(text)
def backspaceClicked(self):
if self.waitingForOperand:
return
text = self.display.text()[:-1]
if not text:
text = '0'
self.waitingForOperand = True
self.display.setText(text)
def clear(self):
if self.waitingForOperand:
return
self.display.setText('0')
self.waitingForOperand = True
def clearAll(self):
self.sumSoFar = 0.0
self.factorSoFar = 0.0
self.pendingAdditiveOperator = ''
self.pendingMultiplicativeOperator = ''
self.display.setText('0')
self.waitingForOperand = True
def clearMemory(self):
self.sumInMemory = 0.0
def readMemory(self):
self.display.setText(str(self.sumInMemory))
self.waitingForOperand = True
def setMemory(self):
self.equalClicked()
self.sumInMemory = float(self.display.text())
def addToMemory(self):
self.equalClicked()
self.sumInMemory += float(self.display.text())
def createButton(self, text, member):
button = Button(text)
button.clicked.connect(member)
return button
def abortOperation(self):
self.clearAll()
self.display.setText("####")
def calculate(self, rightOperand, pendingOperator):
if pendingOperator == "+":
self.sumSoFar += rightOperand
elif pendingOperator == "-":
self.sumSoFar -= rightOperand
elif pendingOperator == "\327":
self.factorSoFar *= rightOperand
elif pendingOperator == "\367":
if rightOperand == 0.0:
return False
self.factorSoFar /= rightOperand
return True
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
calc = Calculator()
sys.exit(calc.exec_())
หน้าต่างโปรแกรม
ให้สร้างโปรแกรม digitalclock สร้าง GUI ด้วย PySide แล้วใส่โค้ดโปรแกรมที่สร้างเสร็จแล้วลงที่ช่องความคิดเห็นหรือที่แฟนเพจสมาคม Python Dev แห่งประเทศไทย พร้อมลิงค์รูปภาพของโปรแกรมครับ ใครที่ทำได้สวยสุด จะได้รับการนำเสนอผลงานที่บล็อกนี้กับที่แฟนเพจสมาคม Python Dev แห่งประเทศไทย และกลุ่ม Python-Thailand ครับ เริ่มส่งได้ตั้งแต่ตอนนี้ถึงวันศุกร์ที่ 29 สิงหาคม พ.ศ.2557 ครับ งานนี้ไม่มีรางวัลให้ครับ
ติดตามบทความต่อไปครับ :)
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