from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5 import QtCore, QtGui
from PyQt5.QtWidgets import QApplication,QWidget,QGridLayout,QScrollArea,QLabel

import os


class ImageViewer(QWidget):
    #gridLayout_2 = ""

    def __init__(self, parent=None):
        QWidget.__init__(self, parent)

        self.gridLayout = QGridLayout(self)
        self.gridLayout.setObjectName("gridLayout")

        self.scrollArea = QScrollArea(self)
        self.scrollArea.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
        self.scrollArea.setWidgetResizable(True)
        self.scrollArea.setObjectName("scrollArea")

        self.scrollAreaWidgetContents = QWidget(self.scrollArea)
        self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 344, 487))
        self.scrollAreaWidgetContents.setObjectName("scrollAreaWidgetContents")

        self.gridLayout_2 = QGridLayout(self.scrollAreaWidgetContents)
        #self.gridLayout_2.setObjectName("gridLayout_2")

        self.scrollArea.setWidget(self.scrollAreaWidgetContents)
        self.gridLayout.addWidget(self.scrollArea, 0, 0, 1, 1)

    def populate(self, pics, size, flags=Qt.KeepAspectRatioByExpanding):
        row = col = 0
        for pic in pics:
            label = QLabel(self)
            try:
                pixmap = QtGui.QPixmap(pic)
                pixmap = pixmap.scaled(size, flags)
                label.setPixmap(pixmap)
                self.gridLayout_2.addWidget(label, row, col)
                col += 1
                #if col % imagesPerRow == 0:
                    #row += 1
                    #col = 0
            except:
                pass

        # self.retranslateUi()
        #QtCore.QMetaObject.connectSlotsByName(self)

    #def retranslateUi(self):
        #self.setWindowTitle(QtGui.QApplication.translate("Form", "Form", None, QtGui.QApplication.UnicodeUTF8))


app = QApplication([])
exm = ImageViewer()
pics = 'C:/Users/Marco/PycharmProjects/scroll_images/'
listdir = os.listdir(pics)

lista = []
for pic in listdir:
    lista.append(pics + pic)

exm.populate(lista, QSize(100, 10))
exm.show()
app.exec_()