nslideshow.py

from PyQt4 import QtGui,QtCore
import sys
import os


class SlideShowPics(QtGui.QWidget):
        """docstring for SlideShowPics"""
        def __init__(self, path):
                super(SlideShowPics, self).__init__()
                # Centre UI
                screen = QtGui.QDesktopWidget().screenGeometry(self)
                size =  self.geometry()
                self.move((screen.width()-size.width())/2, (screen.height()-size.height())/2)
                QtGui.QWidget.__init__(self, None, QtCore.Qt.WindowStaysOnTopHint)
                self._path = path
                self.setStyleSheet("QWidget{background-color: #000000;}")
                self.animFlag = True
                self.pause = False
                self.buildUi()
                self.showFullScreen()
                self.count = 0
                self.nextImage()
                self.updateTimer = QtCore.QTimer()
                self.connect(self.updateTimer, QtCore.SIGNAL("timeout()"), self.nextImage)
                self.playPause()

        def allImages(self):
                return  tuple(os.path.join(self._path,each) for each in os.listdir(self._path)
                        if os.path.isfile(os.path.join(self._path,each)) and each.endswith('png') or each.endswith('jpg'))

        def nextImage(self):
                if self.allImages():
                        if self.count != len(self.allImages()):
                                image = QtGui.QImage(self.allImages()[self.count])
                                pp = QtGui.QPixmap.fromImage(image)
                                self.label.setPixmap(pp.scaled(self.label.size(), QtCore.Qt.KeepAspectRatio, QtCore.Qt.SmoothTransformation))
                        else:
                                self.count = 0
                        if self.animFlag:
                                self.count += 1
                        else:
                                self.count -= 1
                else:
                        message = "No Image found in %s" % os.getcwd()
                        print message
                        self.close()

        def keyPressEvent(self, keyevent):
                """        Capture key to exit, next image, previous image,
                        on Escape , Key Right and key left respectively.
                """
                if keyevent.key() == QtCore.Qt.Key_Escape:
                        self.close()
                if keyevent.key() == QtCore.Qt.Key_Left:
                        self.animFlag = False
                        self.nextImage()
                if keyevent.key() == QtCore.Qt.Key_Right:
                        self.animFlag = True
                        self.nextImage()
                if keyevent.key() == 32:
                        self.pause = self.playPause()

        def playPause(self):
                        if not self.pause:
                                self.pause = True
                                self.updateTimer.start(2500)
                                return self.pause
                        else:
                                self.pause = False
                                self.updateTimer.stop()

        def _openFolder(self):
                selectedDir = str(QtGui.QFileDialog.getExistingDirectory(
                        self,"Select Directory to SlideShow",os.path.expanduser("~")))
                if selectedDir:
                        return selectedDir

        def buildUi(self):
                filename = self._path
                self.layout = QtGui.QHBoxLayout()
                self.label = QtGui.QLabel()
                self.label.setAlignment(QtCore.Qt.AlignCenter)
                self.layout.addWidget(self.label)
                self.setLayout(self.layout)


def main():
        curntPath = os.getcwd()
        if any(each.endswith('png') or each.endswith('jpg') for each in os.listdir(curntPath)):
                app = QtGui.QApplication(sys.argv)
                window =  SlideShowPics(curntPath)
                window.show()
                window.raise_()
                app.exec_()
        else:
                print "No Image found in %s" % os.getcwd()

if __name__ == '__main__':
        main()