PyQt5 – 可滚动的标签

在这篇文章中，我们将看到如何创建一个可滚动的标签，默认情况下，当我们创建一个标签时，所有的文本都是单行的，如果文本的长度大于标签的长度，额外的文本就不会显示，尽管在setWordWrap方法的帮助下，我们可以创建一个多行的标签，但如果文本超过了标签，仍然不会显示。

为了在一个小标签中显示整个文本，我们必须使标签可滚动，为了做到这一点，我们必须建立我们自己的可滚动标签类，它继承了QScrollArea类，允许我们使标签可滚动，下面是可滚动标签的样子

为了做到这一点，我们必须做到以下几点 –

1.创建一个继承于QScrollArea的新类

2.在该类中创建垂直布局

3.创建一个标签

4.使该标签成为多行的

5.覆盖标签的setText方法

6.在主窗口类中创建该类的对象并为其设置文本

滚动标签类的语法

class ScrollLabel(QScrollArea):

    # constructor
    def __init__(self, *args, **kwargs):
        QScrollArea.__init__(self, *args, **kwargs)

        # making widget resizable
        self.setWidgetResizable(True)

        # making qwidget object
        content = QWidget(self)
        self.setWidget(content)

        # vertical box layout
        lay = QVBoxLayout(content)

        # creating label
        self.label = QLabel(content)

        # setting alignment to the text
        self.label.setAlignment(Qt.AlignLeft | Qt.AlignTop)

        # making label multi-line
        self.label.setWordWrap(True)

        # adding label to the layout
        lay.addWidget(self.label)

    # the setText method
    def setText(self, text):
        # setting text to the label
        self.label.setText(text)

以下是实施

# importing libraries
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys
 
 
# class for scrollable label
class ScrollLabel(QScrollArea):
 
    # constructor
    def __init__(self, *args, **kwargs):
        QScrollArea.__init__(self, *args, **kwargs)
 
        # making widget resizable
        self.setWidgetResizable(True)
 
        # making qwidget object
        content = QWidget(self)
        self.setWidget(content)
 
        # vertical box layout
        lay = QVBoxLayout(content)
 
        # creating label
        self.label = QLabel(content)
 
        # setting alignment to the text
        self.label.setAlignment(Qt.AlignLeft | Qt.AlignTop)
 
        # making label multi-line
        self.label.setWordWrap(True)
 
        # adding label to the layout
        lay.addWidget(self.label)
 
    # the setText method
    def setText(self, text):
        # setting text to the label
        self.label.setText(text)
 
class Window(QMainWindow):
 
    def __init__(self):
        super().__init__()
 
        # setting title
        self.setWindowTitle("Python ")
 
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
 
        # calling method
        self.UiComponents()
 
        # showing all the widgets
        self.show()
 
    # method for widgets
    def UiComponents(self):
        # text to show in label
        text = "There are so many options provided by Python to develop GUI " \
               "application and PyQt5 is one of them. PyQt5 is cross-platform " \
               "GUI toolkit, a set of python bindings for Qt v5. One can develop" \
               " an interactive desktop application with so much ease because " \
               "of the tools and simplicity provided by this library.A GUI application" \
               " consists of Front-end and Back-end. PyQt5 has provided a tool called " \
               "‘QtDesigner’ to design the front-end by drag and drop method so that " \
               "development can become faster and one can give more time on back-end stuff. "
 
        # creating scroll label
        label = ScrollLabel(self)
 
        # setting text to the label
        label.setText(text)
 
        # setting geometry
        label.setGeometry(100, 100, 200, 80)
 
 
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
window.show()
 
# start the app
sys.exit(App.exec())