在 PyQt5 Disigner 中调整标签文本的大小

Question

I'm currently making a GUI application in PyQt5 Designer and I'm having problems getting the text of labels and pushbuttons to resize with the labels or pushbuttons. I've been able to get the pushbuttons and labels to resize with the window using PyQt5 Designer's layout feature, but just can't get the text to resize.

Thanks! Ky

Answer 1

Maybe it's bad UX design, but I do this all the time. My old eyes want everything to be big. My trick is to add font size commands to the resizeEvent of the main window. Here is a minimal example

Python code:

from PyQt5.QtWidgets import QMainWindow, QLabel, QApplication, QLineEdit
from PyQt5.QtGui import (QFont, )
from PyQt5 import QtCore, QtWidgets, uic
import sys

form_class = uic.loadUiType('resize.ui')[0]

class Example(QMainWindow, form_class):

    def __init__(self, parent=None):
        super(Example, self).__init__(parent=parent)
        self.setupUi(self)
        self.show()


    def resizeEvent(self, event):
        # calculate scale factor height (sfh) and scale factor width (sfw) based on
        # minimumHeight and minimumWidth of centralWidget
        sfh = float(self.centralWidget().height())/float(self.centralWidget().minimumHeight())
        sfw = float(self.centralWidget().width())/float(self.centralWidget().minimumWidth())
        sf = min(sfh,sfw)  # scale factor. how much to increase/decrease font size

        font = QFont("Arial")
        font.setPointSizeF(int(sf*10.))

        for widget in self.findChildren((QLabel, QLineEdit)):
            # for more complicated MainWindow, add more widgets to tuple
            # argument
            widget.setFont(font)


if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

ui file (resize.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>160</width>
    <height>211</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <property name="minimumSize">
    <size>
     <width>160</width>
     <height>160</height>
    </size>
   </property>
   <layout class="QGridLayout" name="gridLayout">
    <item row="0" column="0">
     <widget class="QLabel" name="label">
      <property name="sizePolicy">
       <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
        <horstretch>0</horstretch>
        <verstretch>0</verstretch>
       </sizepolicy>
      </property>
      <property name="text">
       <string>ResizeExample</string>
      </property>
     </widget>
    </item>
    <item row="1" column="0">
     <widget class="QLineEdit" name="lineEdit">
      <property name="sizePolicy">
       <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
        <horstretch>0</horstretch>
        <verstretch>0</verstretch>
       </sizepolicy>
      </property>
      <property name="text">
       <string>this is a test</string>
      </property>
     </widget>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>160</width>
     <height>26</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>