How to make Signal Slot that takes argument?
Added by Fahmi Noorain over 12 years ago
Hi,
I'm am beginner programmer. Before this I'm using Qt for GUI development in OpenSUSE and familiar with signal slot mechanism. But 'm a little bit confuse with this mechanism in Wt.
I've already read the documentation. But I'm still not get how to pass arguments between a signal and slot. In Qt you can use syntax like this:
connect(&a, SIGNAL (valueChanged(int)), &b, SLOT (setValue(int)));
But how it is done in Wt?
Replies (5)
RE: How to make Signal Slot that takes argument? - Added by Fahmi Noorain over 12 years ago
*Sorry
connect(&a, SIGNAL(valueChanged(int)), &b, SLOT(setValue(int)));
RE: How to make Signal Slot that takes argument? - Added by Mohammed Rashad over 12 years ago
Hey,
you can use boost::bind. or simply like this
QPushButton::connect(this,&MyClass::myButtonClicked)
the parameters are not specified explicitly
its passed automatically
collapsed singal passes a parameter called WModelIndex.
Here is how you connect a collapsed signal of MyTreeView which of type WTreeView
MyTreeView.collapsed().connect(this,&MyClass::myCollapsed);
the slot will look like this
void myCollapsed(WModelIndex &index)
{
//your collapsed code
}
RE: How to make Signal Slot that takes argument? - Added by Fahmi Noorain over 12 years ago
Thank you..syukran for the answer. But that's not what exactly I'm asking about. I know that some Wt signal pass the arguments like internalPathChanged(). But how to make our own signal with arguments?
RE: How to make Signal Slot that takes argument? - Added by Wim Dumon over 12 years ago
Hello Fahmi,
that would be Signal<std::string> mySignal. But feel free to use boost.signal directly, since that's what Wt's signals are based on.
BR,
Wim.
RE: How to make Signal Slot that takes argument? - Added by Fahmi Noorain over 12 years ago
Thanks for both replies. After some reading, I finally understand how Wt signal works. My problem solved.
Ps..not sure how to change the thread title.