[PyKDE] Signals and Slots not working

[Rick van Hattem]

On Saturday 30 December 2006 02:45, paulino1 at sapo.pt wrote:
> These connections statements are not working
>
> QObject.connect( spinbox, SIGNAL('valueChanged()'), slider,
> SLOT('setValue()')) QObject.connect( slider, SIGNAL('valueChanged()'),
> spinbox, SLOT('setValue()'))
>
>
>
> I'm reading "C++ Gui Programming with Qt4" and trying out the exemples
> given there in python.
>
> I translated this code:
>
>  1 #include <QApplication>  2 #include <QHBoxLayout>
>  3 #include <QSlider>
>  4 #include <QSpinBox>
>  5 int main(int argc, char *argv[])
>  6 {
>  7     QApplication app(argc, argv);
>  8     QWidget *window = new QWidget;
>  9     window->setWindowTitle("Enter Your Age");
> 10     QSpinBox *spinBox = new QSpinBox;
> 11     QSlider *slider = new QSlider(Qt::Horizontal);
> 12     spinBox->setRange(0, 130);
> 13     slider->setRange(0, 130);
> 14     QObject::connect(spinBox, SIGNAL(valueChanged(int)),
> 15                      slider, SLOT(setValue(int)));
> 16     QObject::connect(slider, SIGNAL(valueChanged(int)),
> 17                      spinBox, SLOT(setValue(int)));
> 18     spinBox->setValue(35);
> 19     QHBoxLayout *layout = new QHBoxLayout;
> 20     layout->addWidget(spinBox);
> 21     layout->addWidget(slider);
> 22     window->setLayout(layout);
> 23     window->show();
> 24     return app.exec();
> 25 }
>
>
> into this python code
>
> from PyQt4.QtCore import *
> from PyQt4.QtGui  import *
> from sys import argv
>
> app = QApplication( argv)
>
> window = QWidget()
> window.setWindowTitle("Enter Your Age")
>
> spinbox = QSpinBox()
> spinbox.setRange(0, 130)
>
> slider = QSlider( Qt.Horizontal )
> slider.setRange(0, 130)
>
> QObject.connect( spinbox, SIGNAL('valueChanged()'), slider,
> SLOT('setValue()')) QObject.connect( slider, SIGNAL('valueChanged()'),
> spinbox, SLOT('setValue()')) spinbox.setValue(35)
>
> layout = QHBoxLayout()
> layout.addWidget(spinbox)
> layout.addWidget(slider)
>
> window.setLayout(layout)
> window.show()
> app.exec_()
>
>
> The layout is OK but the connections have something wrong that I can't
> figure.
>
> Paulino
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My apologies, I didn't copy it correctly.

Here's the correct one. I've changed the setValue() to setValue(int) and 
valueChanged() to valueChanged(int).

from PyQt4.QtCore import *
from PyQt4.QtGui  import *
from sys import argv

app = QApplication( argv)

window = QWidget()
window.setWindowTitle("Enter Your Age")

spinbox = QSpinBox()
spinbox.setRange(0, 130)

slider = QSlider( Qt.Horizontal )
slider.setRange(0, 130)

QObject.connect( spinbox, SIGNAL('valueChanged(int)'), slider, 
SLOT('setValue(int)'))
QObject.connect( slider, SIGNAL('valueChanged(int)'), spinbox, 
SLOT('setValue(int)'))
spinbox.setValue(35)

layout = QHBoxLayout()
layout.addWidget(spinbox)
layout.addWidget(slider)

window.setLayout(layout)
window.show()
app.exec_()

-- 
Rick van Hattem	Rick.van.Hattem(at)Fawo.nl
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