trouble with the QAction and Signal/Slot-system

[doktorn]

Hello,
I have a little trouble with the QAction and Signal/Slot-system. How do I tell what QAction was just activated(triggered) when I'm already "sent on" to the SLOT-function?

#include <QtGui>
 
#include "mainwindow.h"
 
MainWindow::MainWindow()
{
	setupUi(this);
 
	connect(pushButton, SIGNAL(clicked()), this, SLOT(pushButton_clicked()));	
 
	userCounter=0; 
}
 
//Read files from users-directory (every user is represented by the filename in a file)
//Add the filenames to a array of Action-pointers
//Make a connection with the Action and the edit-user function(slot)
void MainWindow::pushButton_clicked() 
{
	QDir dir;
	dir.setPath("users");
	QStringList userFiles = dir.entryList(); //gets the filelist from the users-dir
	userFiles.removeFirst(); //Removes the . entry
	userFiles.removeFirst(); //Removes the .. entry
 
        //Make Actions and send em to the menu until the StringList is empty
	while(!userFiles.isEmpty()){ 
	userAction[userCounter] = new QAction(userFiles.takeFirst(), this); 
	menuUser->addAction(userAction[userCounter]); 
	connect(userAction[userCounter], SIGNAL(triggered(), this, SLOT(editUser()));
	userCounter++;
	}
}
 
void MainWindow::editUser() 
{
        //textLabel is just a label in the mainwindow - so i can see if i reach this function
	textLabel->setText("One has been triggered - my problem is to tell which one");
}

#include <QtGui>

#include "mainwindow.h"

MainWindow::MainWindow()
{
	setupUi(this);
	
	connect(pushButton, SIGNAL(clicked()), this, SLOT(pushButton_clicked()));	
	
	userCounter=0; 
}

//Read files from users-directory (every user is represented by the filename in a file)
//Add the filenames to a array of Action-pointers
//Make a connection with the Action and the edit-user function(slot)
void MainWindow::pushButton_clicked() 
{
	QDir dir;
	dir.setPath("users");
	QStringList userFiles = dir.entryList(); //gets the filelist from the users-dir
	userFiles.removeFirst(); //Removes the . entry
	userFiles.removeFirst(); //Removes the .. entry
	
        //Make Actions and send em to the menu until the StringList is empty
	while(!userFiles.isEmpty()){ 
	userAction[userCounter] = new QAction(userFiles.takeFirst(), this); 
	menuUser->addAction(userAction[userCounter]); 
	connect(userAction[userCounter], SIGNAL(triggered(), this, SLOT(editUser()));
	userCounter++;
	}
}

void MainWindow::editUser() 
{
        //textLabel is just a label in the mainwindow - so i can see if i reach this function
	textLabel->setText("One has been triggered - my problem is to tell which one");
}

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So, I click the "pushButton" and voila - the menu gets filled up.
I choose one of the users from the menu - and voila - the textLabel is updated.

However - I need to know, being in the editUser-function, what user to change. that is - what Action OR what menuoption was triggered - what is the text of that menu-option (a.k.a. the userfilename)?

I have tried to work a little with sending QAction-pointers along to the editUser-function, without any working result. And even if I get that to work - how do i extract the "username" in a smart way from the QAction in question?

Any solutions to this problem - or Work-arounds to make the same thing happen in a different way would be appreciated.

[mcosta]

Hi,

you can use QObject::sender() to get the sender of a slot.

See also class QSignalMapper

[jpn]

QActionGroup is also one option.

[doktorn]

Very Nice. I went with the QActionGroup this time, but the other info was also very helpful.
Thanks to both of you mcosta and jpn.

I post my working code - in case somebody has the same problem. (And yes, I fertilize my code with too many comments )

#include <QtGui>
 
#include "mainwindow.h"
 
MainWindow::MainWindow()
 
{
	setupUi(this);
	connect(pushButton, SIGNAL(clicked()), this, SLOT(pushButton_clicked()));	
	userCounter=0; //sets users to 0 at creation of each mainwindowobject (we only have one - so its in reality a static int)
}
 
void MainWindow::pushButton_clicked() //here a filereding from the user-dir will take place
{
	QDir dir;
	dir.setPath("users");
	QStringList userFiles = dir.entryList(); //gets the filelist from the users-dir
	userFiles.removeFirst(); //Removes the . entry
	userFiles.removeFirst(); //Removes the .. entry
 
    actionGroup = new QActionGroup(this); //Makes a alignmentgroup of the actions so that we can identify which one has been chosen
 
	while(!userFiles.isEmpty()){ 
	userAction[userCounter] = new QAction(userFiles.takeFirst(), this); //adds the first userFile-entry to a userAction-entry
	userAction[userCounter]->setCheckable(true); //The action must be set checkable so we can check this status later on
	actionGroup->addAction(userAction[userCounter]); //adds the userAction-entry to the actionGroup
	menuUser->addAction(userAction[userCounter]); //adds the userAction-entry to the usermenu
	connect(userAction[userCounter], SIGNAL(triggered()), this, SLOT(editUser()));
	userCounter++;
	}
}
void MainWindow::editUser() //temporary function that will be replaced with the real edituser-program
{
	QAction * tmp = actionGroup->checkedAction();
	if (tmp==0) textLabel->setText("Bad Data");
	else {
	textLabel->setText(tmp->text()); //try out the username (tmp) by displaying it on textLabel
	}
}

#include <QtGui>

#include "mainwindow.h"

MainWindow::MainWindow()
	
{
	setupUi(this);
	connect(pushButton, SIGNAL(clicked()), this, SLOT(pushButton_clicked()));	
	userCounter=0; //sets users to 0 at creation of each mainwindowobject (we only have one - so its in reality a static int)
}

void MainWindow::pushButton_clicked() //here a filereding from the user-dir will take place
{
	QDir dir;
	dir.setPath("users");
	QStringList userFiles = dir.entryList(); //gets the filelist from the users-dir
	userFiles.removeFirst(); //Removes the . entry
	userFiles.removeFirst(); //Removes the .. entry
	
    actionGroup = new QActionGroup(this); //Makes a alignmentgroup of the actions so that we can identify which one has been chosen
	
	while(!userFiles.isEmpty()){ 
	userAction[userCounter] = new QAction(userFiles.takeFirst(), this); //adds the first userFile-entry to a userAction-entry
	userAction[userCounter]->setCheckable(true); //The action must be set checkable so we can check this status later on
	actionGroup->addAction(userAction[userCounter]); //adds the userAction-entry to the actionGroup
	menuUser->addAction(userAction[userCounter]); //adds the userAction-entry to the usermenu
	connect(userAction[userCounter], SIGNAL(triggered()), this, SLOT(editUser()));
	userCounter++;
	}
}
void MainWindow::editUser() //temporary function that will be replaced with the real edituser-program
{
	QAction * tmp = actionGroup->checkedAction();
	if (tmp==0) textLabel->setText("Bad Data");
	else {
	textLabel->setText(tmp->text()); //try out the username (tmp) by displaying it on textLabel
	}
}

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