PyQt5结合QVBoxLayout和QStackedLayout

问题描述

QVBoxLayout可以在小部件中包含QStackedLayout吗？我正在尝试创建一个如下所示的自定义窗口小部件：

import sys
from PyQt5.QtWidgets import *
from pyqtgraph import PlotWidget,plot
import pyqtgraph as pg

class MyCustomWidget(QWidget):
    def __init__(self):
        super().__init__()

        self.my_combo_box = QComboBox(self)
        self.vlayout = QVBoxLayout(self)
        self.slayout = QStackedLayout(self)

        self.vlayout.addWidget(self.my_combo_box)
        self.graphWidget = {}
        self.widget = QWidget()

    def add_new_graphics(self,name,x,y):
        self.my_combo_box.addItem(name)

        self.graphWidget[name] = pg.PlotWidget()
        self.graphWidget[name].plot(x,y)
        self.slayout.addWidget(self.graphWidget[name])

        self.vlayout.addWidget(self.slayout)
        self.widget.setLayout(self.vlayout)

app = QApplication([])
a = MyCustomWidget()
x1 = [1,2,3,4,5,6,7,8,9,10]
y1 = [30,32,34,33,31,29,35,45]
a.add_new_graphics('data1',x1,y1)

x2 = [11,12,13,14,15,16,17,18,19,20]
y2 = [0,1,5]
a.add_new_graphics('data2',x2,y2)

a.show()
sys.exit(app.exec_())

我收到以下错误：

TypeError: addWidget(self,QWidget,stretch: int = 0,alignment: Union[Qt.Alignment,Qt.AlignmentFlag] = Qt.Alignment()): argument 1 has unexpected type 'QStackedLayout'
sys:1: RuntimeWarning: Visible window deleted. To prevent this,store a reference to the window object.

解决方法

您可以将任何布局添加到QVBoxLayout中，包括QStackedLayout，但是您需要为此使用layout.addLayout，而不是layout.addWidget。 MyCustomWidget的定义还有一些其他问题。这是一个应该工作的版本：

class MyCustomWidget(QWidget):
    def __init__(self):
        super().__init__()

        self.my_combo_box = QComboBox(self)
        self.vlayout = QVBoxLayout(self)
        self.slayout = QStackedLayout()

        self.vlayout.addWidget(self.my_combo_box)
        # add stacked layout to self.vlayout (only need to be done once).
        self.vlayout.addLayout(self.slayout)

        self.graphWidget = {}
        
        # self.widget isn't doing anything in your code so I commented out this line
        # self.widget = QWidget()

        # Add signal-slot connection to show correct graph when current index in combo box is changed.
        self.my_combo_box.currentIndexChanged.connect(self.slayout.setCurrentIndex)


    def add_new_graphics(self,name,x,y):
        self.my_combo_box.addItem(name)

        self.graphWidget[name] = pg.PlotWidget()
        self.graphWidget[name].plot(x,y)
        self.slayout.addWidget(self.graphWidget[name])