PyQT 动态改变一个 QMainWindow 标题

Question

我制作了一个非常简单的 python 脚本来将 sqlite3 数据库读入 QtTableWidget。

import sqlite3 as db
from PyQt4 import QtCore, QtGui
import sys

con = db.connect('results.db', isolation_level=None)
cur = con.cursor()
cur.execute("SELECT * FROM Results")
all_data = cur.fetchall()


class UiDialog(object):
    def setupUi(self, datadb):
        datadb.setObjectName("Dialog")
        datadb.resize(404, 304)
        datadb.setWindowTitle("Database results")
        sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Fixed, QtGui.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(datadb.sizePolicy().hasHeightForWidth())
        datadb.setSizePolicy(sizePolicy)
        datadb.setMinimumSize(QtCore.QSize(404, 304))
        datadb.setMaximumSize(QtCore.QSize(404, 304))
        self.table = QtGui.QTableWidget(datadb)
        self.table.setGeometry(QtCore.QRect(2, 2, 400, 261))
        self.table.setObjectName("table")
        self.show = QtGui.QPushButton(datadb)
        self.show.setGeometry(QtCore.QRect(2, 270, 400, 31))
        self.show.setObjectName("show")
        self.show.setText("Show results")
        QtCore.QObject.connect(self.show, QtCore.SIGNAL("clicked()"), self.populate)
        QtCore.QMetaObject.connectSlotsByName(datadb)

    def populate(self):
        self.table.setRowCount(len(all_data))
        self.table.setColumnCount(4)
        self.table.setHorizontalHeaderLabels(['Number', 'Keys', 'Time', 'Tries'])
        for i, item in enumerate(all_data):
            number = QtGui.QTableWidgetItem(str(item[0]))
            keys = QtGui.QTableWidgetItem(item[1])
            time = QtGui.QTableWidgetItem(str(item[2]))
            tries = QtGui.QTableWidgetItem(str(item[3]))
            self.table.setItem(i, 0, number)
            self.table.setItem(i, 1, keys)
            self.table.setItem(i, 2, time)
            self.table.setItem(i, 3, tries)

if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    main_conf = QtGui.QDialog()
    ui = UiDialog()
    ui.setupUi(main_conf)
    main_conf.show()
    ret = app.exec_()
    sys.exit(ret)

它工作正常。我现在的问题是：

有没有办法在运行时动态更改窗口标题？

setWindowTitle() 不会即时更新标题栏，也不会 update() 或 repaint()。

非常感谢您宝贵的时间！

Answer 1

另一种解决方案：

class UiDialog(object):
    def setupUi(self, datadb):
        datadb.setObjectName("Dialog")
        datadb.resize(404, 304)
        datadb.setWindowTitle("Database results")
        sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Fixed, QtGui.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(datadb.sizePolicy().hasHeightForWidth())
        datadb.setSizePolicy(sizePolicy)
        datadb.setMinimumSize(QtCore.QSize(404, 304))
        datadb.setMaximumSize(QtCore.QSize(404, 304))
        self.table = QtGui.QTableWidget(datadb)
        self.table.setGeometry(QtCore.QRect(2, 2, 400, 261))
        self.table.setObjectName("table")
        self.show = QtGui.QPushButton(datadb)
        self.show.setGeometry(QtCore.QRect(2, 270, 400, 31))
        self.show.setObjectName("show")
        self.show.setText("Show results")
        QtCore.QObject.connect(self.show, QtCore.SIGNAL("clicked()"), lambda: self.populate(datadb)) ### Using LAMBDA function to pass datadb object to the method
        #self.show.pressed.connect(lambda: self.populate(datadb)) ### Another syntax for the same operation
        QtCore.QMetaObject.connectSlotsByName(datadb)

    def populate(self, mainWindow):
        self.table.setRowCount(len(all_data))
        self.table.setColumnCount(4)
        self.table.setHorizontalHeaderLabels(['Number', 'Keys', 'Time', 'Tries'])
        for i, item in enumerate(all_data):
            number = QtGui.QTableWidgetItem(str(item[0]))
            keys = QtGui.QTableWidgetItem(item[1])
            time = QtGui.QTableWidgetItem(str(item[2]))
            tries = QtGui.QTableWidgetItem(str(item[3]))
            self.table.setItem(i, 0, number)
            self.table.setItem(i, 1, keys)
            self.table.setItem(i, 2, time)
            self.table.setItem(i, 3, tries)
        mainWindow.setWindowTitle("ANOTHER TITLE")

如果您使用从.ui 文件生成的代码，您可以将您的 MAIN 代码写入另一个文件，然后将生成的 ui 文件导入您的 MAIN 代码，这样以后的更改不会影响或更改您的 Main 代码。 ..所以我选择的最佳解决方案是：

from PyQt4 import QtCore, QtGui
from pyUI import UiDialog ### your UI file, pyUI is the file name and UiDialog is the Ui Class name
import sys

class GUI(QtGui.QDialog):

    def __init__(self):
        QtGui.QDialog.__init__(self)
        self.ui = UiDialog()
        self.ui.setupUi(self)
        self.ui.show.pressed.connect(self.populate)

    def populate(self):
        self.ui.table.setRowCount(len(all_data))
        self.ui.table.setColumnCount(4)
        self.ui.table.setHorizontalHeaderLabels(['Number', 'Keys', 'Time', 'Tries'])
        for i, item in enumerate(all_data):
            number = QtGui.QTableWidgetItem(str(item[0]))
            keys =   QtGui.QTableWidgetItem(item[1])
            time =   QtGui.QTableWidgetItem(str(item[2]))
            tries =  QtGui.QTableWidgetItem(str(item[3]))
            self.ui.table.setItem(i, 0, number)
            self.ui.table.setItem(i, 1, keys)
            self.ui.table.setItem(i, 2, time)
            self.ui.table.setItem(i, 3, tries)
        self.setWindowTitle("ANOTHER TITLE")

con = db.connect('results.db', isolation_level=None)
cur = con.cursor()
cur.execute("SELECT * FROM Results")
all_data = cur.fetchall()

app = QtGui.QApplication(sys.argv)
dailog = GUI()
dailog.show()
sys.exit(app.exec_())

Answer 2

def setupUi(self, datadb):
    [...]
    self.datadb = datadb

def populate(self):
    [...]
    self.datadb.setWindowTitle('new title')

这行得通。但是您正在以一种奇怪且不方便的方式构建您的小部件。更常规的一种是使用继承：

class DatabaseUi(QtGui.QDialog):
    def __init__(self):
        QtGui.QDialog.__init__(self)

        self.table = QtGui.QTableWidget()

        self.button = QtGui.QPushButton()
        self.button.setText("Show results")
        self.button.clicked.connect(self.populate)

        vlay = QtGui.QVBoxLayout()
        vlay.addWidget(self.table)
        vlay.addWidget(self.button)

        self.setLayout(vlay)
        self.setFixedSize(404, 304)
        self.setWindowTitle("Database results")

    def populate(self):
        self.setWindowTitle('new title')
        self.table.setColumnCount(4)
        self.table.setHorizontalHeaderLabels(['Number', 'Keys', 'Time', 'Tries'])
        [...]


if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)

    ui = DatabaseUi()
    ui.show()

    sys.exit(app.exec_())

Answer 3

self.ui.btn_close.clicked.connect(self.btn_close_clicked)

def btn_close_clicked(self): self.close()