在我的代碼中，使用一個具有固定維度/大小的 QLabel。一開始，我將文本 “Hello,Python”分配給該 QLablel?，F在我想將 QLablel 的文本更改為“Hai，歡迎使用 Python”。如何減小 QLabel 的字體大小，并顯示 具有該特定區域/大小的全文（沒有任何截斷/隱藏/隱藏）？import sysfrom PyQt5.QtWidgets import *class Labelexample(QWidget): def __init__(self): super().__init__() self.labl = QLabel("Hello,Python",self) self.tbox = QLineEdit(self) self.labl.setFixedSize(150,30) self.tbox.setFixedSize(200,30) self.labl.move(50,50) self.tbox.move(140,50) self.labl.setText("Hai, welcome to Python") # self.labl.adjustsize()app = QApplication(sys.argv)mywin = Labelexample()mywin.show()sys.exit(app.exec_())
2 回答
慕少森
TA貢獻2019條經驗 獲得超9個贊
QFontMetrics 類提供字體規格信息。https://doc.qt.io/qt-5/qfontmetrics.html#QFontMetrics
嘗試一下：
import sys
from PyQt5.Qt import *
class Labelexample(QWidget):
def __init__(self):
super().__init__()
text = "Hello,Python"
self.labl = QLabel(text, self)
# self.labl.setFixedSize(150,30)
self.labl.setFixedWidth(150) # +++
self.labl.setMinimumHeight(30) # +++
self.labl.move(50,50)
self.labl.setStyleSheet("background-color: yellow;")
self.tbox = QLineEdit(self)
self.tbox.setFixedSize(200,30)
# self.tbox.move(140,50)
self.tbox.move(200,50)
self.tbox.returnPressed.connect(self.return_pressed) # +++
self.pointSize = 20 # 20
self.fontD = self.font()
self.fontD.setPointSize(self.pointSize)
self.metrics = QFontMetrics(self.fontD)
self.width = self.metrics.width(text)
self.height = self.metrics.height()
self.labl.setFixedWidth(self.width)
self.labl.setFont(self.fontD)
# text = "Hai, welcome to Python"
# self.labl.setText(text) # v v
self.labl.adjustSize() # - adjustsize + adjustSize
def return_pressed(self): # +++
if not self.tbox.text():
self.labl.setText('')
self.labl.setFont(self.fontD)
self.labl.adjustSize()
return
width = self.metrics.width(self.tbox.text())
height = self.metrics.height()
if not width:
width = 1
koef = self.width / width
pointSize = int(self.pointSize * koef)
font = self.font()
font.setPointSize(pointSize)
self.labl.setFont(font)
height = self.metrics.height()
self.labl.setText(self.tbox.text())
self.labl.adjustSize()
if __name__ == '__main__':
app = QApplication(sys.argv)
mywin = Labelexample()
mywin.resize(450, 415)
mywin.show()
sys.exit(app.exec_())
