PyQt：如何创建一个可滚动的窗口

Question

我认为在 PyQt 中创建可滚动窗口应该容易得多。 我有一个超出窗口的标签列表，我想向下滚动以查看它们。目前代码没有给我错误，但窗口只是没有出现：

class Example(QWidget):

    def __init__(self):
        super().__init__()

        layout = QVBoxLayout()

        lbl_arr = makeLabelArr()

        for i in range(1,8):
            qb = lbl_arr[i]
            # qb.setFixedWidth(300)
            layout.addWidget(qb)

        layout.setAlignment(Qt.AlignTop)

        scroll = QScrollArea()
        scroll.setWidget(self)
        scroll.setWidgetResizable(True)
        scroll.setFixedHeight(400)

        layout.addWidget(scroll)

        self.setLayout(layout)


        self.setGeometry(0, 0, 600, 220)
        self.setWindowTitle('SnP watchlist')

        self.show()


if __name__ == '__main__':

    app = QApplication(sys.argv)
    #print(QDesktopWidget().availableGeometry())

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

Answer 1

将窗口本身设为QScrollArea，如下所示：

class Window(QScrollArea):
    def __init__(self):
        super(Window, self).__init__()
        widget = QWidget()
        layout = QVBoxLayout(widget)
        layout.setAlignment(Qt.AlignTop)
        for index in range(100):
            layout.addWidget(QLabel('Label %02d' % index))
        self.setWidget(widget)
        self.setWidgetResizable(True)

Answer 2

这里有一个例子：https://www.learnpyqt.com/tutorials/qscrollarea/

from PyQt5.QtWidgets import (QWidget, QSlider, QLineEdit, QLabel, QPushButton, QScrollArea,QApplication,
                             QHBoxLayout, QVBoxLayout, QMainWindow)
from PyQt5.QtCore import Qt, QSize
from PyQt5 import QtWidgets, uic
import sys


class MainWindow(QMainWindow):

    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.scroll = QScrollArea()             # Scroll Area which contains the widgets, set as the centralWidget
        self.widget = QWidget()                 # Widget that contains the collection of Vertical Box
        self.vbox = QVBoxLayout()               # The Vertical Box that contains the Horizontal Boxes of  labels and buttons

        for i in range(1,50):
            object = QLabel("TextLabel: "+str(i))
            self.vbox.addWidget(object)

        self.widget.setLayout(self.vbox)

        #Scroll Area Properties
        self.scroll.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
        self.scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.scroll.setWidgetResizable(True)
        self.scroll.setWidget(self.widget)

        self.setCentralWidget(self.scroll)

        self.setGeometry(600, 100, 1000, 900)
        self.setWindowTitle('Scroll Area Demonstration')
        self.show()

        return

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

if __name__ == '__main__':
    main()

Answer 3

您应该在添加scroll bar 小部件后设置layout。

class Example(QWidget):

    def __init__(self):
        super().__init__()

        layout = QVBoxLayout()

        lbl_arr = makeArrayOfLabelsHTML()

        for i in range(1,8):
            qb = lbl_arr[i]
            layout.addWidget(qb)

        layout.setAlignment(Qt.AlignTop)

        scroll = QScrollArea()
        scroll.setWidget(self)
        scroll.setWidgetResizable(True)
        scroll.setFixedHeight(400)
        layout.addWidget(scroll)

        # set layout after adding scroll bar 
        self.setLayout(layout)

        self.setGeometry(0, 0, 600, 220)
        self.setWindowTitle('SnP watchlist')

        self.show()



if __name__ == '__main__':

        app = QApplication(sys.argv)
        #print(QDesktopWidget().availableGeometry())

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