Rezising QWidget afer expanding/collapsing it

Question

我正在尝试根据QWidget是展开还是折叠来自动调整其大小。我尝试了在这里和这里发布的几种方法。

我没有设法采用这些，以便它按照我想要的方式工作：我希望 QWidget 在展开时调整自身大小(它现在可以工作(，但在折叠它(取消选中 QCheckBox(后，它的大小仍然太大并且不会变回其原始状态。

这是我的代码：

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
import sys
class CheckableComboBox(QComboBox):
    def __init__(self, parent = None):
        super(CheckableComboBox, self).__init__(parent)
        self.view().pressed.connect(self.handleItemPressed)
        self.setModel(QStandardItemModel(self))
        self.setStyleSheet("QComboBox{"
                           "font-size:11px;"
                           "color:black;"
                           "background-color:white;"
                           "border:1px solid black;"
                           "padding:1px;""}")
        self.setEditable(True)
        self.lineEdit().setAlignment(Qt.AlignCenter)
        self.lineEdit().setReadOnly(True)
        self.setMinimumSize(150, 40)
    def handleItemPressed(self, index):
        item = self.model().itemFromIndex(index)
        if item.text() != ' ' and item.checkState() == Qt.Checked:
            item.setCheckState(Qt.Unchecked)
        if item.text() != ' ' and item.checkState() != Qt.Checked:
            item.setCheckState(Qt.Checked)
class Example(QWidget):
    def __init__(self):
        super().__init__()
##        self.setFixedSize(350, 280)
        self.init_UI()
    def init_UI(self):
        self.years = [' ', '2017', '2018', '2019', '2020']
        self.months = [' ', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12']
        self.metrics = [' ', 'Seller', 'Section', 'Store']
        self.units = [' ', 'Number of Pieces Sold', 'Total Value']
        self.setWindowTitle('Dialog')
        self.sMetric = QLabel('Select metric(s):')
        self.sUnit = QLabel('Select unit(s):')
        self.okButton = QPushButton('Ok')
        self.cancelButton = QPushButton('Cancel')
        self.okButton.clicked.connect(self.okClicked)
        self.cancelButton.clicked.connect(self.cancelClicked)
        for i in (self.sMetric, self.sUnit, self.okButton, self.cancelButton):
            i.setFixedHeight(40)
            i.setFixedWidth(150)
        self.timeWise = QCheckBox('Time-wise View')
        self.timeWise.stateChanged.connect(self.on_checked)
        self.metricCombo = CheckableComboBox()
        for index, element in enumerate(self.metrics):
            self.metricCombo.addItem(element)
            if index > 0:
                item = self.metricCombo.model().item(index, 0)
                item.setCheckState(Qt.Unchecked)
        self.unitCombo = CheckableComboBox()
        for index, element in enumerate(self.units):
            self.unitCombo.addItem(element)
            if index > 0:
                item = self.unitCombo.model().item(index, 0)
                item.setCheckState(Qt.Unchecked)
        self.grid = QGridLayout()
        self.grid.setSpacing(10)
        self.grid.addWidget(self.sMetric, 1, 0)
        self.grid.addWidget(self.metricCombo, 1, 1)
        self.grid.addWidget(self.sUnit, 2, 0)
        self.grid.addWidget(self.unitCombo, 2, 1)
        self.grid.addWidget(self.timeWise, 3, 0)
        self.grid.addWidget(self.okButton, 6, 0)
        self.grid.addWidget(self.cancelButton, 6, 1)
        self.setLayout(self.grid)
    def on_checked(self, state):
        if state == Qt.Checked:
            print('Checked')
            self.sYear = QLabel('Select year(s):')
            self.sMonth = QLabel('Select month(s):')
            for i in (self.sYear, self.sMonth):
                i.setFixedHeight(40)
                i.setFixedWidth(150)
            self.monthCombo = CheckableComboBox()
            for index, element in enumerate(self.months):
                self.monthCombo.addItem(element)
                if index > 0:
                    item = self.monthCombo.model().item(index, 0)
                    item.setCheckState(Qt.Unchecked)
            self.yearCombo = CheckableComboBox()
            for index, element in enumerate(self.years):
                self.yearCombo.addItem(element)
                if index > 0:
                    item = self.yearCombo.model().item(index, 0)
                    item.setCheckState(Qt.Unchecked)
            self.grid.addWidget(self.sYear, 4, 0)
            self.grid.addWidget(self.yearCombo, 4, 1)
            self.grid.addWidget(self.sMonth, 5, 0)
            self.grid.addWidget(self.monthCombo, 5, 1)
        else:
            print('Unchecked')
            self.sYear.deleteLater()
            self.sMonth.deleteLater()
            self.monthCombo.deleteLater()
            self.yearCombo.deleteLater()
    def okClicked(self):
        self.close()
    def cancelClicked(self):
        self.close()
if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = Example()
    main.show()
    sys.exit(app.exec_())

有什么建议如何进行吗？

Answer 1

您必须设置包含QLayout::SetFixedSize中所有小部件的设计的大小限制：

QLayout::SetFixedSize 3 主小部件的大小设置为 sizeHint((; 它根本无法调整大小。

除此之外，对

代码的改进不会创建然后删除小部件，但最好隐藏它们或使其根据需要可见。

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
import sys
class CheckableComboBox(QComboBox):
    def __init__(self, parent = None):
        super(CheckableComboBox, self).__init__(parent)
        self.view().pressed.connect(self.handleItemPressed)
        self.setModel(QStandardItemModel(self))
        self.setStyleSheet("QComboBox{"
                           "font-size:11px;"
                           "color:black;"
                           "background-color:white;"
                           "border:1px solid black;"
                           "padding:1px;""}")
        self.setEditable(True)
        self.lineEdit().setAlignment(Qt.AlignCenter)
        self.lineEdit().setReadOnly(True)
        self.setMinimumSize(150, 40)
    def handleItemPressed(self, index):
        item = self.model().itemFromIndex(index)
        if item.text() != ' ' and item.checkState() == Qt.Checked:
            item.setCheckState(Qt.Unchecked)
        if item.text() != ' ' and item.checkState() != Qt.Checked:
            item.setCheckState(Qt.Checked)
class Example(QWidget):
    def __init__(self):
        super().__init__()
##        self.setFixedSize(350, 280)
        self.init_UI()
    def init_UI(self):
        self.years = [' ', '2017', '2018', '2019', '2020']
        self.months = [' ', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12']
        self.metrics = [' ', 'Seller', 'Section', 'Store']
        self.units = [' ', 'Number of Pieces Sold', 'Total Value']
        self.setWindowTitle('Dialog')
        self.sMetric = QLabel('Select metric(s):')
        self.sUnit = QLabel('Select unit(s):')
        self.okButton = QPushButton('Ok')
        self.cancelButton = QPushButton('Cancel')
        self.okButton.clicked.connect(self.okClicked)
        self.cancelButton.clicked.connect(self.cancelClicked)
        for i in (self.sMetric, self.sUnit, self.okButton, self.cancelButton):
            i.setFixedHeight(40)
            i.setFixedWidth(150)
        self.timeWise = QCheckBox('Time-wise View')
        self.timeWise.toggled.connect(self.on_checked)
        self.metricCombo = CheckableComboBox()
        for index, element in enumerate(self.metrics):
            self.metricCombo.addItem(element)
            if index > 0:
                item = self.metricCombo.model().item(index, 0)
                item.setCheckState(Qt.Unchecked)
        self.unitCombo = CheckableComboBox()
        for index, element in enumerate(self.units):
            self.unitCombo.addItem(element)
            if index > 0:
                item = self.unitCombo.model().item(index, 0)
                item.setCheckState(Qt.Unchecked)
        self.grid = QGridLayout()
        self.grid.setSpacing(10)
        self.grid.addWidget(self.sMetric, 1, 0)
        self.grid.addWidget(self.metricCombo, 1, 1)
        self.grid.addWidget(self.sUnit, 2, 0)
        self.grid.addWidget(self.unitCombo, 2, 1)
        self.grid.addWidget(self.timeWise, 3, 0)
        self.grid.addWidget(self.okButton, 6, 0)
        self.grid.addWidget(self.cancelButton, 6, 1)
        self.setLayout(self.grid)

        self.sYear = QLabel('Select year(s):')
        self.sMonth = QLabel('Select month(s):')
        for i in (self.sYear, self.sMonth):
            i.setFixedHeight(40)
            i.setFixedWidth(150)
        self.monthCombo = CheckableComboBox()
        for index, element in enumerate(self.months):
            self.monthCombo.addItem(element)
            if index > 0:
                item = self.monthCombo.model().item(index, 0)
                item.setCheckState(Qt.Unchecked)
        self.yearCombo = CheckableComboBox()
        for index, element in enumerate(self.years):
            self.yearCombo.addItem(element)
            if index > 0:
                item = self.yearCombo.model().item(index, 0)
                item.setCheckState(Qt.Unchecked)
        self.grid.addWidget(self.sYear, 4, 0)
        self.grid.addWidget(self.yearCombo, 4, 1)
        self.grid.addWidget(self.sMonth, 5, 0)
        self.grid.addWidget(self.monthCombo, 5, 1)
        self.grid.setSizeConstraint(QLayout.SetFixedSize)
        self.on_checked(False)
    def on_checked(self, checked):
        self.sYear.setVisible(checked)
        self.sMonth.setVisible(checked)
        self.monthCombo.setVisible(checked)
        self.yearCombo.setVisible(checked)
    def okClicked(self):
        self.close()
    def cancelClicked(self):
        self.close()
if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = Example()
    main.show()
    sys.exit(app.exec_())