自动将“stackedWidget”页面的高度调整为其上放置的小部件的高度

Question

我想调整stackedWidget的高度，以便它下面的QTextEdit小部件的高度与stackedWidget活动页面上按钮的高度相匹配。当页面{^

但是页面normal上的2QPushButton应该在顶部，并且QTextEdit小部件应该向上放大。如何做到这一点

---

main.py

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.uic import loadUi


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        loadUi("mainwindow.ui", self)


def main():
    app = QApplication(sys.argv)
    main_window = MainWindow()
    main_window.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

---

mainwindow.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>601</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <property name="locale">
   <locale language="English" country="UnitedKingdom"/>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QGridLayout" name="gridLayout_2">
    <item row="0" column="0">
     <widget class="QStackedWidget" name="stackedWidget">
      <property name="sizePolicy">
       <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
        <horstretch>0</horstretch>
        <verstretch>0</verstretch>
       </sizepolicy>
      </property>
      <property name="currentIndex">
       <number>0</number>
      </property>
      <widget class="QWidget" name="normal" native="true">
       <layout class="QGridLayout" name="gridLayout">
        <item row="0" column="0">
         <widget class="QPushButton" name="normal_start_button">
          <property name="text">
           <string>Start</string>
          </property>
         </widget>
        </item>
        <item row="0" column="1">
         <widget class="QPushButton" name="normal_stop_button">
          <property name="text">
           <string>Stop</string>
          </property>
         </widget>
        </item>
       </layout>
      </widget>
      <widget class="QWidget" name="extended">
       <layout class="QGridLayout" name="gridLayout_3">
        <item row="0" column="0">
         <widget class="QPushButton" name="extended_quick_start_button">
          <property name="text">
           <string>Quick Start</string>
          </property>
         </widget>
        </item>
        <item row="0" column="1">
         <widget class="QPushButton" name="extended_stop_button">
          <property name="text">
           <string>Stop</string>
          </property>
         </widget>
        </item>
        <item row="1" column="0">
         <widget class="QPushButton" name="extended_slow_start_button">
          <property name="text">
           <string>Slow Start</string>
          </property>
         </widget>
        </item>
        <item row="1" column="1">
         <widget class="QPushButton" name="extended_pause_button">
          <property name="text">
           <string>Pause</string>
          </property>
         </widget>
        </item>
       </layout>
      </widget>
     </widget>
    </item>
    <item row="1" column="0">
     <widget class="QTextEdit" name="output"/>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>24</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

---

页面normal的屏幕截图，上面和下面只有2QPushButton和未使用的空间：

---

页面extended的屏幕截图，其中包含4 QPushButton和可用空间的最佳利用：

Answer 1

QStackedWidget将其包含的小部件的默认最大高度作为默认高度，因此在这种情况下，一个可能的解决方案是将高度设置为当前小部件的默认高度作为参考

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.uic import loadUi


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        loadUi("mainwindow.ui", self)
        self.stackedWidget.currentChanged.connect(self.adjustHeight)
        self.adjustHeight()

    def adjustHeight(self):
        h = self.stackedWidget.currentWidget().sizeHint().height()
        self.stackedWidget.setFixedHeight(h)


def main():
    app = QApplication(sys.argv)
    main_window = MainWindow()
    main_window.show()

    def onTimeout():
        sw = main_window.stackedWidget
        sw.setCurrentIndex((sw.currentIndex() + 1) % sw.count())

    # test
    from PyQt5.QtCore import QTimer

    timer = QTimer(timeout=onTimeout)
    timer.start(1000)

    sys.exit(app.exec_())


if __name__ == "__main__":
    main()