QGridLayout 中的 QScrollArea

问题描述

在 PySide6 中（与 pyside2 和 PyQt5 相同）

我想将 QMainWindow 分成四个部分，每个部分都有一个用于显示图像的 QScrollArea。这是最小的可重现示例。

from PySide6.QtCore import *
from PySide6.QtGui import *
from PySide6.QtWidgets import *
import sys
import numpy as np

class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow,self).__init__()
        self.setupUi()

    def setupUi(self,*args,**kwargs):
        self.mainWindow = MainWindow
        self.resize(800,600)
        self.load()

    def load(self):

        internalWidget = QWidget()
        gridLayout = qgridLayout(internalWidget)
        internalWidget.setLayout(gridLayout)
        self.setCentralWidget(internalWidget)
        # row,column,rowSpan,columnSpan
        config = [
            [0,1,1],[0,[1,]
        for row,columnSpan in config:

            # create scrollArea
            scrollArea = QScrollArea()
            scrollArea.setSizePolicy(QSizePolicy.Expanding,QSizePolicy.Expanding)
            scrollArea.setViewportMargins(0,0)
            scrollArea.setWidgetResizable(True)
            gridLayout.setContentsMargins(0,0)
            #########################random pixmap#####################################
            arr = np.random.randint(0,255,(200+row*200,200+column*100))# random a image
            if [row,columnSpan] == [0,1]:
                arr = np.random.randint(0,(1000,1000))
            image = QImage(arr[:],arr.shape[1],arr.shape[0],arr.shape[1] * 3,QImage.Format_RGB888)
            pixmap = Qpixmap.fromImage(image)
            ###########################################################################
            label = QLabel()
            label.setpixmap(pixmap)
            scrollArea.setWidget(label)
            scrollArea.setAlignment(Qt.AlignCenter)
            label.show()

            gridLayout.addWidget(scrollArea,row,columnSpan,alignment=Qt.AlignCenter)
            scrollArea.show()

if __name__ == "__main__":

    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())

但是当我运行它时，只有当图像足够大时，QScrollArea 才能填充 qgridLayout 的网格。如果图像小于网格，则 QScrollArea 变为与图像相同的大小（小于网格）。

快照：

如何使每个 QScrollArea 始终填充网格而不调整图像大小？ （并不是每个 QScrollArea 的大小都不一样）

解决方法

如果你想让每个 QScrollArea 占据相同的空间，那么在每行和每列中设置相同的拉伸因子：

import random
import sys


from PySide6.QtCore import QSize,Qt
from PySide6.QtGui import QColor,QPixmap
from PySide6.QtWidgets import (
    QApplication,QGridLayout,QLabel,QMainWindow,QScrollArea,QWidget,)


class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow,self).__init__()
        self.setupUi()

    def setupUi(self):
        self.resize(800,600)
        self.load()

    def load(self):

        internalWidget = QWidget()
        gridLayout = QGridLayout(internalWidget)
        gridLayout.setContentsMargins(0,0)
        self.setCentralWidget(internalWidget)
        config = [
            [0,0],[0,1],[1,]
        for row,column in config:
            scrollArea = QScrollArea(widgetResizable=True)
            scrollArea.setViewportMargins(0,0)

            pixmap = QPixmap(QSize(*random.sample(range(0,500),2)))
            pixmap.fill(QColor(*random.sample(range(0,255),3)))

            label = QLabel(alignment=Qt.AlignCenter)
            label.setPixmap(pixmap)
            scrollArea.setWidget(label)

            gridLayout.addWidget(scrollArea,row,column)

        gridLayout.setColumnStretch(0,1)
        gridLayout.setColumnStretch(1,1)
        gridLayout.setRowStretch(0,1)
        gridLayout.setRowStretch(1,1)


if __name__ == "__main__":

    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())