在PyQt5中隐藏小部件后，如何设置较小的窗口大小？

Question

我正在尝试实现一个功能，您可以通过单击按钮隐藏或显示图形。但是，当图形再次隐藏时，对话框窗口的大小不会更改回原来的大小。self.resize()语句似乎被忽略了。我怎样才能做到这一点？但是，使用setFixedSize()是可行的，我不希望大小是固定的。我以为我可以用setSizePolicy()以某种方式“取消固定”它，但那没有帮助

import sys
import matplotlib.pyplot as plt

from PyQt5.Qt import QSizePolicy
from PyQt5.QtWidgets import (
    QDialog, QApplication, QGridLayout, QWidget, QGroupBox, QPushButton
)
from matplotlib.backends.backend_qt5agg import \
    FigureCanvasQTAgg as FigureCanvas


class MainWindow(QDialog):
    def __init__(self):
        super().__init__()
        self.layout = QGridLayout()
        self.setLayout(self.layout)

        self.settings = QGroupBox('Settings:')
        self.settingsLayout = QGridLayout()
        self.settings.setLayout(self.settingsLayout)
        self.showFigureBtn = QPushButton('Show Figure')
        self.settingsLayout.addWidget(self.showFigureBtn)
        self.layout.addWidget(self.settings)

        self.figureWidget = QWidget()
        self.figureWidget.setMinimumSize(300, 300)
        self.figureLayout = QGridLayout(self.figureWidget)
        self.fig, self.ax = plt.subplots()
        self.canvas = FigureCanvas(self.fig)
        self.figureLayout.addWidget(self.canvas)
        self.figureWidget.setLayout(self.figureLayout)
        self.layout.addWidget(self.figureWidget)
        self.figureWidget.setVisible(False)

        self.showFigureBtn.clicked.connect(self.toggle_figure)

        self.min_size = (300, 100)
        self.resize(*self.min_size)

    def toggle_figure(self):
        state = not self.figureWidget.isVisible()
        if state:
            self.showFigureBtn.setText('Hide Figure')
            self.min_size = self.size()
            self.figureWidget.setVisible(state)
        else:
            self.showFigureBtn.setText('Show Figure')
            self.figureWidget.setVisible(state)
            self.resize(self.min_size)
            # self.setFixedSize(self.min_size)
            # self.setSizePolicy(QSizePolicy.Minimum, QSizePolicy.Minimum)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    GUI = MainWindow()
    GUI.show()
    sys.exit(app.exec_())

Answer 1

一种可能的方法是使用adjustSize（）调整大小，然后设置所需大小：

def toggle_figure(self):
    state = not self.figureWidget.isVisible()
    if state:
        self.showFigureBtn.setText("Hide Figure")
        self.min_size = self.size()
        self.figureWidget.setVisible(state)
    else:
        self.showFigureBtn.setText("Show Figure")
        self.figureWidget.setVisible(state)
        self.adjustSize()
        self.resize(self.min_size)