Pyqt标签在调整标签大小时改变窗口大小[重复]

Question

我正在学习 pyqt，并试图在小部件中间制作一段文本，当小部件大小根据小部件窗口的大小更改时，它会更改字体大小。我有一些我想要的东西，除了当水平扩展窗口时，在某个点，它也会自动垂直扩展窗口。

我怀疑它与填充有关。水平拖动窗口大小时所需的行为是让文本按比例缩放，直到它会导致窗口的垂直尺寸发生变化，此时不再更改字体大小。

下面是到目前为止我用一堆打印语句来计算大小的结果，但由于某种原因，没有任何东西与窗口的大小相匹配。

from PyQt5.QtWidgets import (QWidget,QHBoxLayout,QLabel,QApplication,QSizePolicy)
from PyQt5.QtGui import QFont, QFontMetrics
from PyQt5.QtCore import Qt,pyqtSignal
import sys

class alarm(QWidget):
    resized = pyqtSignal()
    def __init__(self):
        super().__init__()

        self.setGeometry(300, 300, 150, 150)
        self.setWindowTitle("Alarm Clock")

        self.init_UI()

    def init_UI(self):
        self.counter = 0
        self.resized.connect(self.set_font_size)
        self.time = QLabel('Test')
        self.time.setFont(QFont('Times New Roman'))
        self.time.setSizePolicy(QSizePolicy.Expanding,QSizePolicy.Expanding)

        self.time.setAlignment(Qt.AlignCenter)
        hbox = QHBoxLayout()
        hbox.addWidget(self.time)

        self.setLayout(hbox)
    def resizeEvent(self,event):
        self.resized.emit()

    def set_font_size(self):
        curr_geo = self.geometry().width()
        font = self.time.font()
        curr_pixel_size = font.pixelSize()
        new_pixel_size = curr_geo/3

        font.setPixelSize(new_pixel_size)
        t = self.time.contentsRect().height()
        print('Label contents rect: ',t)
        print('label height: ' + str(t))
        new_bounding = QFontMetrics(font).boundingRect(self.time.text())

        print('New bounding: ' + str(new_bounding.height()))
        print('Total height: ' + str(self.geometry().height()))
        if new_bounding.height() > self.geometry().height():
            font.setPixelSize(curr_pixel_size)
            self.time.setFont(font)
        else:
            font.setPixelSize(new_pixel_size)
            self.time.setFont(font)

if __name__ == "__main__":
    app = QApplication([])
    alarm = alarm()
    alarm.show()
    sys.exit(app.exec_())

Answer 1

使用标签高度time

if new_bounding.height() > self.time.height():

甚至没有else:

    if new_bounding.height() <= self.time.height():
        font.setPixelSize(new_pixel_size)
        self.time.setFont(font)

---

完整代码：

from PyQt5.QtWidgets import (QWidget,QHBoxLayout,QLabel,QApplication,QSizePolicy)
from PyQt5.QtGui import QFont, QFontMetrics
from PyQt5.QtCore import Qt,pyqtSignal
import sys

class alarm(QWidget):
    resized = pyqtSignal()
    def __init__(self):
        super().__init__()

        self.setGeometry(300, 300, 150, 150)
        self.setWindowTitle("Alarm Clock")

        self.init_UI()

    def init_UI(self):
        self.counter = 0
        self.resized.connect(self.set_font_size)
        self.time = QLabel('Test')
        self.time.setFont(QFont('Times New Roman'))
        self.time.setSizePolicy(QSizePolicy.Expanding,QSizePolicy.Expanding)

        self.time.setAlignment(Qt.AlignCenter)
        hbox = QHBoxLayout()
        hbox.addWidget(self.time)

        self.setLayout(hbox)
    def resizeEvent(self,event):
        self.resized.emit()

    def set_font_size(self):
        curr_geo = self.geometry().width()
        font = self.time.font()
        curr_pixel_size = font.pixelSize()
        new_pixel_size = curr_geo/3

        font.setPixelSize(new_pixel_size)
        t = self.time.contentsRect().height()
        print('Label contents rect: ',t)
        print('label height: ' + str(t))
        new_bounding = QFontMetrics(font).boundingRect(self.time.text())

        print('New bounding: ' + str(new_bounding.height()))
        print('Geometry height: ' + str(self.geometry().height()))
        print('Label height: ' + str(self.time.height()))
        if new_bounding.height() <= self.time.height():
            font.setPixelSize(new_pixel_size)
            self.time.setFont(font)

if __name__ == "__main__":
    app = QApplication([])
    alarm = alarm()
    alarm.show()
    sys.exit(app.exec_())