在PyQt5中刷新窗口小部件时是否需要重新加载整个窗口？问题的回答

在PyQt5中刷新窗口小部件时是否需要重新加载整个窗口？

回答此问题可获得 20 贡献值，回答如果被采纳可获得 50 分。

我创建了一个PyQt5窗口，其中SQL表的数据显示在一个框架（QtSql.QSqlTableModel，QTableView）和一个插入新数据的按钮（<code>InsertButton</code>）中。为了刷新显示的表，我使用了<code>self.MonthTab.InsertButton.clicked.connect(self.startMonth)</code>，并按组合框中选择的年份使用<code>QSortFilterProxyModel</code>和<code>setFilterFixedString</code>过滤值，到目前为止效果良好。但是当我过滤条目（仅显示2020个条目）并插入一个新条目时，通过重新构建窗口更新表，并将组合框设置回默认值。因此，我再也看不到过滤后的2020条目了。我希望在更新表时保留组合框设置，因此我尝试只更新表框架（<code>update()</code>，<code>hide()</code>/<code>show()</code>，调用Month类（<code>createView()</code>和<code>handle_db</code>），而不是Month窗口），但在（手动）重新加载Month窗口之前，更改始终不可见。据我所知，startMonth将Month类元素放在Month窗口中，而ComboBox必须在Month类中才能在Month窗口中看到，这在尝试更新框架而不是ComboBox时是一个两难的选择，这没有任何意义。所以我可能对PyQt窗口和QWidgets有些误解。是否可以在运行时只更新一个小部件而不重新加载整个窗口？是否可以在Month窗口中显示未放置在Month类中的小部件？我对PyQt和Qt很陌生，我在谷歌上搜索并尝试了很多，但直到现在都没有成功，所以我希望你能给我一个提示，告诉我哪里出了问题，或者如何解决问题 <pre><code>class Month(Menu): def __init__(self, parent=Menu): super(Month, self).__init__(parent) self.x = datetime.datetime.now() self.year = QtWidgets.QComboBox(self) self.year.setGeometry(100, 80, 100, 24) self.year.setMouseTracking(False) self.year.addItem(self.x.strftime("%G")) self.year.addItem("2019") self.year.addItem("2020") self.year.setEditable(False) self.year.currentTextChanged.connect(self.date_filter) self.InsertButton = QtWidgets.QPushButton(self) self.InsertButton.setText("Insert") self.InsertButton.clicked.connect(self.clicked) # inserts values into sql database table self.handle_db() self.createView("Table Model (View 1)", self.model) def createDB(self): ... # provides sql-connection, creates database def initializeModel(self, model): ... def createView(self, title, model): ... def handle_db(self): ... # creates model, proxymodel, view, layout and frame for showing table def date_filter(self): class MainWindow(QMainWindow): def __init__(self, parent=None): super(MainWindow, self).__init__(parent) self.setGeometry(200, 50, 900, 650) print("MainWindow") self.startMonth() def startMonth(self): self.MonthTab = Month(self) self.setWindowTitle("Month") self.setCentralWidget(self.MonthTab) self.MonthTab.InsertButton.clicked.connect(self.startMonth) # rebuilds Month window -> table is updated self.show() if __name__ == '__main__': app = QApplication(sys.argv) Month().createDB() w = MainWindow() sys.exit(app.exec_()) </code></pre> 我正在使用Python3.8、PyQt5.15.0、PyCharm 2020.2和LinuxMint19.3 我担心“最小可复制示例”相当大： <pre><code>import sys from PyQt5 import QtWidgets, QtSql, QtCore from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, \ QVBoxLayout, QTableView, QPushButton, \ QMessageBox, qApp, QFrame from PyQt5.QtCore import QSortFilterProxyModel import datetime class Menu(QWidget): # die allgemeine Fenster-Parent-Class def __init__(self, parent=None): super(Menu, self).__init__() self.MonatBTN = QPushButton("Monat", self) self.MonatBTN.move(20, 30) class Monat(Menu): def __init__(self, parent=Menu): super(Monat, self).__init__(parent) self.x = datetime.datetime.now() self.jahr = QtWidgets.QComboBox(self) self.jahr.setGeometry(100, 80, 100, 24) self.jahr.setMouseTracking(False) self.jahr.addItem(self.x.strftime("%G")) self.jahr.addItem("2019") self.jahr.addItem("2020") self.jahr.setEditable(False) self.jahr.currentTextChanged.connect(self.date_filter) self.date_frame = QFrame(self) self.date_frame.setFrameShape(QFrame.StyledPanel) self.date_frame.setLineWidth(1) self.date_frame.setGeometry(100, 500, 161, 50) self.date_picker = QtWidgets.QDateEdit(calendarPopup=True) self.date_picker.setDateTime(QtCore.QDateTime.currentDateTime()) self.date_layout = QVBoxLayout() self.date_layout.addWidget(self.date_picker) self.date_frame.setLayout(self.date_layout) self.date_frame.show() self.posten = QtWidgets.QComboBox(self) self.posten.setGeometry(300, 513, 161, 24) self.posten.setMouseTracking(False) self.posten.addItem("") self.posten.addItem("Apple") self.posten.addItem("Peach") self.posten.addItem("Orange") self.posten.setEditable(True) self.wert = QtWidgets.QComboBox(self) self.wert.setGeometry(500, 513, 161, 24) self.wert.setMouseTracking(False) self.wert.addItem("") self.wert.addItem("20") self.wert.addItem("300") self.wert.addItem("-15") self.wert.setEditable(True) self.InsertButton = QtWidgets.QPushButton(self) self.InsertButton.setText("Einfügen") self.InsertButton.move(700, 513) self.InsertButton.clicked.connect(self.clicked) self.handle_db() self.createView("Table Model (View 1)", self.model) def createDB(self): print("creating") self.cash_db = QtSql.QSqlDatabase.addDatabase('QSQLITE') self.cash_db.setDatabaseName('cash.db') if not self.cash_db.open(): QMessageBox.critical(None, qApp.tr("Cannot open database"), qApp.tr("Unable to establish a database connection.\n" "Click Cancel to exit."), QMessageBox.Cancel) return False query = QtSql.QSqlQuery() # query.exec_("create table cash(id int primary key, " query.exec_("create table cash( " "date varchar(20), datum varchar(20), posten varchar(40), wert varchar(20))") return True def initializeModel(self, model): self.model.setTable('cash') self.model.setEditStrategy(QtSql.QSqlTableModel.OnFieldChange) self.model.select() self.model.setHeaderData(0, QtCore.Qt.Horizontal, "Date") self.model.setHeaderData(1, QtCore.Qt.Horizontal, "Datum") self.model.setHeaderData(2, QtCore.Qt.Horizontal, "Posten") self.model.setHeaderData(3, QtCore.Qt.Horizontal, "Wert") def createView(self, title, model): self.view = QTableView() self.view.setModel(model) self.view.setWindowTitle(title) return self.view def handle_db(self): print("handling") self.model = QtSql.QSqlTableModel() self.delrow = -1 self.initializeModel(self.model) self.proxyModel = QSortFilterProxyModel() self.proxyModel.setSourceModel(self.model) self.view = self.createView("Table Model (View 1)", self.model) self.view.setModel(self.proxyModel) self.view.setSortingEnabled(True) self.view.hideColumn(0) self.view.header = self.view.horizontalHeader() self.view.header.resizeSection(1, 100) self.view.header.resizeSection(2, 466) self.view.header.resizeSection(3, 100) self.view.resizeRowsToContents() self.proxyModel.setSourceModel(self.model) self.view.setModel(self.proxyModel) self.frame = QFrame(self) self.frame.setFrameShape(QFrame.StyledPanel) self.frame.setLineWidth(1) self.frame.setGeometry(100, 120, 700, 300) self.layout = QVBoxLayout() self.layout.addWidget(self.view) self.frame.setLayout(self.layout) self.frame.show() def date_filter(self): jahr = self.jahr.currentText() filter = jahr self.proxyModel.setFilterFixedString(filter) self.view.resizeRowsToContents() def clicked(self): d = self.date_picker.date() date = d.toPyDate() datum = (date.strftime("%d.%m.%Y")) posten = self.posten.currentText() v = self.wert.currentText() val = ('%10.2f') % float(v) wert = str(val) query = QtSql.QSqlQuery() query.exec_( "insert into cash (date, datum, posten, wert) " "values('%s', '%s', '%s', '%s')" % (date, datum, posten, wert)) class MainWindow(QMainWindow): def __init__(self, parent=None): super(MainWindow, self).__init__(parent) self.setGeometry(200, 50, 900, 650) print("MainWindow") self.startMonat() def startMonat(self): self.MonatTab = Monat(self) self.setWindowTitle("Cash - Monat") self.setCentralWidget(self.MonatTab) self.MonatTab.InsertButton.clicked.connect(self.startMonat) self.show() if __name__ == '__main__': app = QApplication(sys.argv) Monat().createDB() w = MainWindow() sys.exit(app.exec_()) </code></pre>

0 条评论
分类：Python问答

默认排序时间排序

1 个回答

匿名 1天前

　擅长：python、mysql、java

在PyQt5中刷新窗口小部件时是否需要重新加载整个窗口？

1 个回答

相关Python问题