PyQt change picture with keyboard button - python-3.x

Question

this is my first post here and I haven't seen it anywhere so hopefully it is ok. I am trying to change the displayed image with a keyboard click (think slideshow). This is my code so far:
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel
from PyQt5.QtGui import QPixmap
from PyQt5.QtCore import Qt
import os
class App(QWidget):
def __init__(self):
super().__init__()
self.title = 'Document Analysis'
self.left = 30
self.top = 30
self.width = 640
self.height = 480
self.imagenumber=0
self.initUI()
def keyPressEvent(self, event):
key=event.key()
if key==Qt.Key_Right:
self.imagenumber=self.imagenumber+1
self.showimage(self.imagenumber)
self.show()
else:
super(self).keyPressEvent(event)
def initUI(self):
self.setWindowTitle(self.title)
self.setGeometry(self.left, self.top, self.width, self.height)
self.showimage(0)
self.show()
def showimage(self,imagenumber):
label = QLabel(self)
directory = "C:\\Desktop\\Pictures"
imagelist = os.listdir(directory)
pixmap = QPixmap(directory + '\\' + imagelist[imagenumber])
label.setPixmap(pixmap)
self.resize(pixmap.width() + 500, pixmap.height())
self.show()
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = App()
sys.exit(app.exec_())
It seems to be sort of getting somewhere, the first image displays just fine, and I know imagenumber does change, and when I stopped it from showing at first it resized the window but still didn't show the image. Any suggestions on what I am doing wrong?
This is part of a larger project which is the reason for the extra space on the side of the picture, but help would be appreciated.

Answer 1

You're close. Try the following...
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QVBoxLayout
from PyQt5.QtGui import QPixmap
from PyQt5.QtCore import Qt
import os
class App(QWidget):
def __init__(self):
super().__init__()
self.title = 'Document Analysis'
self.left = 30
self.top = 30
self.width = 640
self.height = 480
self.imagenumber=0
self.initUI()
def keyPressEvent(self, event):
key=event.key()
if key==Qt.Key_Right:
self.imagenumber=self.imagenumber+1
self.showimage(self.imagenumber)
# self.show()
else:
super(self).keyPressEvent(event)
def initUI(self):
layout = QVBoxLayout()
self.setLayout(layout)
self.label = QLabel(self)
layout.addWidget(self.label)
self.setWindowTitle(self.title)
self.setGeometry(self.left, self.top, self.width, self.height)
self.showimage(0)
self.show()
def showimage(self,imagenumber):
# label = QLabel(self)
directory = "C:\\Desktop\\Pictures"
imagelist = os.listdir(directory)
pixmap = QPixmap(directory + '\\' + imagelist[imagenumber])
# label.setPixmap(pixmap)
self.label.setPixmap(pixmap)
self.resize(pixmap.width() + 500, pixmap.height())
# self.show()
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = App()
sys.exit(app.exec_())
Mainly, you need a persistent label. You also only need to call show() once.