SIGNAL and SLOT

[sophister]

Hi, now I have to connect several SIGNALS to one SLOT, but how can I distinguish which QWidget emit the SIGNAL in the SLOT function??
Is there any way to find the sender??
Thanks !!

[caduel]

one way is QObject::sender()other possibilities might be classes like QSignalMapper

[sophister]

Thanks!!
Could I ask you one more question?
when I use the QMap, something is always wrong. Following is my codes:
in the .h file :

QMap<QString, QToolButton*> buttons;

QMap<QString, QToolButton*> buttons;

To copy to clipboard, switch view to plain text mode 

And I have added the declare at the beginning of the header file like this:

class QMap<QString, QToolButton*>;

class QMap<QString, QToolButton*>;

To copy to clipboard, switch view to plain text mode 

But I just can't pass the compiler.

[caduel]

you need to write

#include <QMap>
#include <QString>
class QToolButton; // forward decl ok as you just use a ptr to it

#include <QMap>
#include <QString>
class QToolButton; // forward decl ok as you just use a ptr to it

To copy to clipboard, switch view to plain text mode 

[sophister]

Thank you !!
yeah, but I have forward declare for class QToolButton, and it's ok.
if I haven't include QMap, and just forward declare it using

class QToolButton;

class QToolButton;

To copy to clipboard, switch view to plain text mode 

, the compiler will give some errors.
The only way to use QMap in the header file is to

#include <QMap>

#include <QMap>

To copy to clipboard, switch view to plain text mode 

, while just using forward declare won't work.
I'm really puzzled

[caduel]

well, the compiler needs to know more here: QMap is a templated type.
If you write QMap, the compiler assumes QMap is a 'plain' type and then writing QMap<T1,T2> is not ok, just as you may not write QString<int>.