第一个程序简单收费系统

看完这个程序，一般的小程序需求应该已经可以去开发了，但是作为一个程序狗，希望还是把文档给看完比较好，知其然知其所以然，所以我还会坚持下去。

import sys
 42from PySide6.QtCore import Qt, Slot
 43from PySide6.QtGui import QAction, QPainter
 44from PySide6.QtWidgets import (QApplication, QHeaderView, QHBoxLayout, QLabel, QLineEdit,
 45                               QMainWindow, QPushButton, QTableWidget, QTableWidgetItem,
 46                               QVBoxLayout, QWidget)
 47from PySide6.QtCharts import QChartView, QPieSeries, QChart
 48
 49
 50class Widget(QWidget):
 51    def __init__(self):
 52        QWidget.__init__(self)
 53        self.items = 0
 54
 55        # Example data
 56        self._data = {"Water": 24.5, "Electricity": 55.1, "Rent": 850.0,
 57                      "Supermarket": 230.4, "Internet": 29.99, "Bars": 21.85,
 58                      "Public transportation": 60.0, "Coffee": 22.45, "Restaurants": 120}
 59
 60        # Left
 61        self.table = QTableWidget()
 62        self.table.setColumnCount(2)
 63        self.table.setHorizontalHeaderLabels(["Description", "Price"])
 64        self.table.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)
 65
 66        # Chart
 67        self.chart_view = QChartView()
 68        self.chart_view.setRenderHint(QPainter.Antialiasing)
 69
 70        # Right
 71        self.description = QLineEdit()
 72        self.price = QLineEdit()
 73        self.add = QPushButton("Add")
 74        self.clear = QPushButton("Clear")
 75        self.quit = QPushButton("Quit")
 76        self.plot = QPushButton("Plot")
 77
 78        # Disabling 'Add' button
 79        self.add.setEnabled(False)
 80
 81        self.right = QVBoxLayout()
 82        self.right.addWidget(QLabel("Description"))
 83        self.right.addWidget(self.description)
 84        self.right.addWidget(QLabel("Price"))
 85        self.right.addWidget(self.price)
 86        self.right.addWidget(self.add)
 87        self.right.addWidget(self.plot)
 88        self.right.addWidget(self.chart_view)
 89        self.right.addWidget(self.clear)
 90        self.right.addWidget(self.quit)
 91
 92        # QWidget Layout
 93        self.layout = QHBoxLayout()
 94
 95        #self.table_view.setSizePolicy(size)
 96        self.layout.addWidget(self.table)
 97        self.layout.addLayout(self.right)
 98
 99        # Set the layout to the QWidget
100        self.setLayout(self.layout)
101
102        # Signals and Slots
103        self.add.clicked.connect(self.add_element)
104        self.quit.clicked.connect(self.quit_application)
105        self.plot.clicked.connect(self.plot_data)
106        self.clear.clicked.connect(self.clear_table)
107        self.description.textChanged[str].connect(self.check_disable)
108        self.price.textChanged[str].connect(self.check_disable)
109
110        # Fill example data
111        self.fill_table()
112
113    @Slot()
114    def add_element(self):
115        des = self.description.text()
116        price = self.price.text()
117
118        try:
119            price_item = QTableWidgetItem(f"{float(price):.2f}")
120            price_item.setTextAlignment(Qt.AlignRight)
121
122            self.table.insertRow(self.items)
123            description_item = QTableWidgetItem(des)
124
125            self.table.setItem(self.items, 0, description_item)
126            self.table.setItem(self.items, 1, price_item)
127
128            self.description.setText("")
129            self.price.setText("")
130
131            self.items += 1
132        except ValueError:
133            print("Wrong price", price)
134
135
136    @Slot()
137    def check_disable(self, s):
138        if not self.description.text() or not self.price.text():
139            self.add.setEnabled(False)
140        else:
141            self.add.setEnabled(True)
142
143    @Slot()
144    def plot_data(self):
145        # Get table information
146        series = QPieSeries()
147        for i in range(self.table.rowCount()):
148            text = self.table.item(i, 0).text()
149            number = float(self.table.item(i, 1).text())
150            series.append(text, number)
151
152        chart = QChart()
153        chart.addSeries(series)
154        chart.legend().setAlignment(Qt.AlignLeft)
155        self.chart_view.setChart(chart)
156
157    @Slot()
158    def quit_application(self):
159        QApplication.quit()
160
161    def fill_table(self, data=None):
162        data = self._data if not data else data
163        for desc, price in data.items():
164            description_item = QTableWidgetItem(desc)
165            price_item = QTableWidgetItem(f"{price:.2f}")
166            price_item.setTextAlignment(Qt.AlignRight)
167            self.table.insertRow(self.items)
168            self.table.setItem(self.items, 0, description_item)
169            self.table.setItem(self.items, 1, price_item)
170            self.items += 1
171
172    @Slot()
173    def clear_table(self):
174        self.table.setRowCount(0)
175        self.items = 0
176
177
178class MainWindow(QMainWindow):
179    def __init__(self, widget):
180        QMainWindow.__init__(self)
181        self.setWindowTitle("Tutorial")
182
183        # Menu
184        self.menu = self.menuBar()
185        self.file_menu = self.menu.addMenu("File")
186
187        # Exit QAction
188        exit_action = QAction("Exit", self)
189        exit_action.setShortcut("Ctrl+Q")
190        exit_action.triggered.connect(self.exit_app)
191
192        self.file_menu.addAction(exit_action)
193        self.setCentralWidget(widget)
194
195    @Slot()
196    def exit_app(self, checked):
197        QApplication.quit()
198
199
200if __name__ == "__main__":
201    # Qt Application
202    app = QApplication(sys.argv)
203    # QWidget
204    widget = Widget()
205    # QMainWindow using QWidget as central widget
206    window = MainWindow(widget)
207    window.resize(800, 600)
208    window.show()
209
210    # Execute application
211    sys.exit(app.exec())

结果