Scrollarea scroll not set

prem1980

Im using pyqt4 to create a scrollarea.

When I load the image I dont see the scrollbar being set.

import sys
from PyQt4 import QtGui, QtCore, Qt

class Canvas(QtGui.QWidget):
    def __init__(self, *args, **kwargs):
        super(Canvas, self).__init__()
        self.pixmap = QtGui.QPixmap()

    def paintEvent(self, event):
        print 'paintevent'
        painter = QtGui.QPainter(self)
#         painter.scale(3,3)
#         painter.translate(200, 200)
        painter.drawPixmap(QtCore.QPoint(), self.pixmap)

class Window(QtGui.QMainWindow):

    def __init__(self):
        super(Window, self).__init__()
        self.setGeometry(50, 50, 500, 300)
        self.setWindowTitle("PyQT tuts!")
        self.setWindowIcon(QtGui.QIcon('pythonlogo.png'))
        openFile = QtGui.QAction("Open File", self)
        openFile.setShortcut("Ctrl+O")
        openFile.setStatusTip('Open File')
        openFile.triggered.connect(self.file_open)
        zoomIn = QtGui.QAction("Zoom", self)
        zoomIn.setShortcut("Ctrl+z")
        zoomIn.setStatusTip('Open File')
        zoomIn.triggered.connect(self.zoom_in)
        self.scrollArea = QtGui.QScrollArea()
#         self.scrollBars = {
#             QtCore.Qt.Vertical: self.scrollArea.verticalScrollBar(),
#             QtCore.Qt.Horizontal: self.scrollArea.horizontalScrollBar(),
#         }
        self.statusBar()
        mainMenu = self.menuBar()

        fileMenu = mainMenu.addMenu('&File')
        fileMenu.addAction(openFile)
        fileMenu.addAction(zoomIn)
        
        self.canvas = Canvas()
#         self.scrollArea.setWidget(self.canvas)
#         self.scrollArea.setWidgetResizable(True)
#         self.scrollArea.setFixedHeight(400)
        self.home()
#         self.resize(200, 200)

    def home(self):
        self.show()

    def file_open(self):
        name = QtGui.QFileDialog.getOpenFileName(self, 'Open File')
        if name:
            self.load_pixmap(QtGui.QPixmap(name))

    def load_pixmap(self, pixmap):
        self.canvas.pixmap = pixmap
        self.scrollArea.setWidget(self.canvas)
        self.scrollArea.setWidgetResizable(True)
        self.setCentralWidget(self.scrollArea)
#         self.canvas.adjustSize()
#         self.canvas.update()

    def zoom_in(self):
        print 'zoom in'
        
        print self.scrollArea
        print self.scrollBars[QtCore.Qt.Horizontal].value()
        self.scrollBars[QtCore.Qt.Horizontal].setValue(10)
        print self.scrollBars[QtCore.Qt.Horizontal].value()
        print self.scrollArea.horizontalScrollBarPolicy()

def run():
    app = QtGui.QApplication(sys.argv)
    GUI = Window()
    sys.exit(app.exec_())

run()

SGaist

Hi and welcome to devnet,

Please take a look at the Image Viewer example to see how you can use a QScrollArea properly.

prem1980

@SGaist Thanks, its not working once I load the image. Also, im not very familiar with C++

mrjj

@prem1980

Hi, you mean Image viewer is not working when you load and image ?
Try to make window smaller. Picture has to be bigger than window before scrollbars will come.

prem1980

@mrjj The widget containing the pixmap is loading properly but the scroll bar is not visible.

mrjj

@prem1980
Hi
Even if u make window really small ?
alt text

prem1980

@mrjj thats correct..Did you use the python code that was given?

mrjj

@prem1980
Hi
Hmm are we talking the Image sample or the your code here ?
Image sample works fine for me so i wonder why you said it did not for you.
Anyway, its set up this way

imageLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
imageLabel->setScaledContents(true);    
scrollArea->setWidget(imageLabel);

sorry cant type it in python.