toolbutton action is not happening.

[phillip_Qt]

Hi All
I've a tool button . i'm adding some action to that toolbutton. when i trigger that action i need some methode to b executed. i did like following.

header file
------------------
QAction *m_action;
actionlist();
 
source file
-----------------------
ui->toolButton->addAction(action);
 
constructor()
{
	    connect(m_action,SIGNAL( triggered()),
            this, SLOT(claamethode()));
}
void actionlist()
{
        m_action = new QAction(m_strTempName,ui->toolButton_3);
	// assiging m_action here
	ui->toolbutton->addaction(m_action);
 
}

header file
------------------
QAction *m_action;
actionlist();

source file
-----------------------
ui->toolButton->addAction(action);

constructor()
{
	    connect(m_action,SIGNAL( triggered()),
            this, SLOT(claamethode()));
}
void actionlist()
{
        m_action = new QAction(m_strTempName,ui->toolButton_3);
	// assiging m_action here
	ui->toolbutton->addaction(m_action);

}

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But connect methode is not working. how to solve this?

[Lykurg]

Are you sure that m_action is not null when you establish the connection?

[yogeshgokul]

Hi All
I've a tool button . i'm adding some action to that toolbutton. when i trigger that action i need some methode to b executed. i did like following.

header file
------------------
QAction *m_action;
actionlist();
 
source file
-----------------------
ui->toolButton->addAction(action);
 
constructor()
{
	    connect(m_action,SIGNAL( triggered()),
            this, SLOT(claamethode()));
}
void actionlist()
{
        m_action = new QAction(m_strTempName,ui->toolButton_3);
	// assiging m_action here
	ui->toolbutton->addaction(m_action);
 
}

header file
------------------
QAction *m_action;
actionlist();

source file
-----------------------
ui->toolButton->addAction(action);

constructor()
{
	    connect(m_action,SIGNAL( triggered()),
            this, SLOT(claamethode()));
}
void actionlist()
{
        m_action = new QAction(m_strTempName,ui->toolButton_3);
	// assiging m_action here
	ui->toolbutton->addaction(m_action);

}

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But connect methode is not working. how to solve this?

What is this

[phillip_Qt]

What is this

Hi Yogesh. Below is the complete code.

Header file
------------------
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = 0);
   ~MainWindow();
 
private:
    Ui::MainWindow *ui;
 
 
private:
    //! To collect the list of classrooms and computers added to the coressponding classroom
    QList<QTreeWidgetItem *> *m_ClassRoom;
    QList<QTreeWidgetItem *> m_computersAddedToCalssroom;
    QStringList m_strlistClassRoom;
    QTreeWidgetItem *m_treelist;
    QList<QTreeWidgetItem *> temp;
 
 
private slots:
    //! To add Computers
    void on_toolButton_3_clicked();
    void addComputers();
    //! To add classroom
    void addClassRoom();
 
private slots:
    //! To handle the right click event in The right side bar
    void ContextMenuDisplayMethod(const QPoint &);
 
    private:
    QMenu contextMenu;
 
    private:
    //! treewidget context menu
    QAction * m_actionClassroom;
    QAction * m_actionComputer;
    QList<QAction *> m_actionsList;
 
    private:
    //SingleClass SingleClassobj;
    QString m_strIpEntered;
    QString m_strClassRoomSel;
    QString m_strUserNameEnter;
    clientSettingsDialog m_clientSettingsDlgobj;
 
    //! To add sub Items in tree widget
    QModelIndex m_modelIndex;
 
 
    //! To add sub Items in tree widget
    QTreeWidgetItem *m_Childlist ;
    int index;
 
    //! Menu showing the list of added classroom from classroom button
    QMenu m_classRoomListMenu;
    QStringList m_strlistMenu;
    QString m_strTempName;
 
private slots:
    void openClassInClientArea();
 
    private:
    void test();
    QAction *acttest;
    QMenu menu;
};
 
#endif // MAINWINDOW_H
 
 
source file
-------------------
 
SingleClass SingleClassobj;
 
 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QWidget::showMaximized();
 
    m_ClassRoom = new QList<QTreeWidgetItem *>;
 
    ui->treeWidget->setContextMenuPolicy(Qt::CustomContextMenu);
    ui->treeWidget->setColumnCount(2);
    ui->treeWidget->setColumnWidth(0,200);
    QStringList columns;
    columns << tr( "Classrooms/computers" ) << tr( "IP-address" );
    ui->treeWidget->setHeaderLabels(columns);
    connect(ui->treeWidget, SIGNAL(customContextMenuRequested(const QPoint &)),
            this, SLOT(ContextMenuDisplayMethod(const QPoint &)));
    //!
    m_actionClassroom = new QAction(tr("Add ClassRoom"),ui->treeWidget);
    m_actionComputer = new QAction(tr("Add Computer"),ui->treeWidget);
 
    //! For context menu display methode in treewidget
    connect(m_actionClassroom, SIGNAL(triggered()), this, SLOT(addClassRoom()));
    connect(m_actionComputer, SIGNAL(triggered()),this, SLOT(addComputers()));
 
    contextMenu.addAction(m_actionClassroom);
    contextMenu.addAction(m_actionComputer);
 
    //! To hide client setting dialog
    m_clientSettingsDlgobj.hide();
 
    acttest = new QAction(m_strTempName,ui->toolButton_3);
 
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::addComputers()
{
    if(m_ClassRoom->size() == 0)
    {
        if( QMessageBox::question( window(), tr( "Missing classroom" ),
                                                tr( "Before adding computers "
                                                        "you have to "
                                                        "create at least one "
                                                        "classroom.\nDo you "
                                                        "want to create a new "
                                                        "classrom now?" ),
                                                QMessageBox::Yes,
                                                QMessageBox::No ) ==
                                                        QMessageBox::No )
        {
           return;
        }
         addClassRoom();
    }
    else
    {
        if(m_clientSettingsDlgobj.exec())
        {
            m_strIpEntered = m_clientSettingsDlgobj.getIP();;
            m_strClassRoomSel = m_clientSettingsDlgobj.getSelClassRoom();
            m_strUserNameEnter = m_clientSettingsDlgobj.getUserName();
            if(m_strUserNameEnter.isEmpty())
            {
                m_strUserNameEnter = m_strIpEntered;
            }
            temp = ui->treeWidget->findItems(m_strClassRoomSel , Qt::MatchExactly);
            QTreeWidgetItemIterator it(ui->treeWidget);
 
            for(int i = 0; i < ui->treeWidget->topLevelItemCount(); i++)
            {
 
                QTreeWidgetItem *parent = ui->treeWidget->topLevelItem(i);
                if(parent->text(0) == m_strClassRoomSel)
                {
                    m_Childlist = new QTreeWidgetItem(parent);
                    m_Childlist->setText(0, m_strUserNameEnter);
                    m_Childlist->setText(1, m_strIpEntered);
 
                    return;
                }
            }
        }
 
    }
}
 
void MainWindow::addClassRoom()
{
    bool bOk = false;
    QString classroom_name = QInputDialog::getText( this,
                    tr( "New classroom" ),
                    tr( "Please enter the name of the classroom you "
                                                    "want to create." ),
                    QLineEdit::Normal, tr( "New classroom" ), &bOk );
 
    if(!classroom_name.isEmpty())
    {
        bool bTemp = false;
        for(int i = 0; i < m_strlistClassRoom.size(); i++)
        {
            if(m_strlistClassRoom.at(i) == classroom_name)
                bTemp = true;
        }
        if(bTemp == false)
        {
            m_strlistClassRoom.append(classroom_name);
            m_treelist = new QTreeWidgetItem;
            m_treelist->setText(0,classroom_name);
            m_ClassRoom->append(m_treelist);
 
            ui->treeWidget->addTopLevelItem(m_treelist);
 
            SingleClassobj.setSingleClass(classroom_name);
        }
 
    }
 
    for(int i = 0; i <SingleClassobj.getSingleCLass().size() ; i++)
    {
        m_clientSettingsDlgobj.setClassComboBox(SingleClassobj.getSingleCLass().at(i));
 
    }
 
    //! To set menu in classroom toolButton
    test();
 
}
 
 
void MainWindow::ContextMenuDisplayMethod(const QPoint &pt)
{
    contextMenu.popup(QCursor::pos());
    contextMenu.exec(QCursor::pos());
}
 
void MainWindow::on_toolButton_3_clicked()
{
 
    qDebug()<<"INside toolButton";
    ui->toolButton_3->showMenu();
    menu.exec();
 
}
 
void MainWindow::openClassInClientArea()
{
   // QAction * act = m_classRoomListMenu.activeAction();
    QAction * act =  ui->toolButton_3->defaultAction();
 
    QString strClassroom = act->text();
 
    qDebug()<<"Class rRoom : "<<strClassroom;
    //QList<QTreeWidget> treewidgetchildren = ui->treeWidget->findChildren<QTreeWidget>(strClassroom);
 
}
 
void MainWindow::test()
{
    bool bTemp = false;
 
    for(int i = 0; i < m_strlistClassRoom.size(); i++)
    {
        bTemp = false;
        m_strTempName = ("ClassRoom ")+ m_strlistClassRoom.at(i);
        acttest = new QAction(m_strTempName,ui->toolButton_3);
        for(int j = 0; j < m_strlistMenu.size(); j++)
        {
            if(m_strlistMenu.at(j) == m_strTempName)
            {
                bTemp = true;
            }
 
        }
        if(bTemp == false)
        {
            acttest->setText(m_strTempName);
            m_strlistMenu.append(m_strTempName);
            //m_classRoomListMenu.addAction(m_strTempName);
            qDebug()<<"MainWindow::test() : acttest value : "<<acttest->text();
            ui->toolButton_3->addAction(acttest);
        }
    }
    connect(acttest, SIGNAL(triggered()),
            this, SLOT(openClassInClientArea()));
 
}

Header file
------------------

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
   ~MainWindow();

private:
    Ui::MainWindow *ui;


private:
    //! To collect the list of classrooms and computers added to the coressponding classroom
    QList<QTreeWidgetItem *> *m_ClassRoom;
    QList<QTreeWidgetItem *> m_computersAddedToCalssroom;
    QStringList m_strlistClassRoom;
    QTreeWidgetItem *m_treelist;
    QList<QTreeWidgetItem *> temp;


private slots:
    //! To add Computers
    void on_toolButton_3_clicked();
    void addComputers();
    //! To add classroom
    void addClassRoom();

private slots:
    //! To handle the right click event in The right side bar
    void ContextMenuDisplayMethod(const QPoint &);

    private:
    QMenu contextMenu;

    private:
    //! treewidget context menu
    QAction * m_actionClassroom;
    QAction * m_actionComputer;
    QList<QAction *> m_actionsList;

    private:
    //SingleClass SingleClassobj;
    QString m_strIpEntered;
    QString m_strClassRoomSel;
    QString m_strUserNameEnter;
    clientSettingsDialog m_clientSettingsDlgobj;

    //! To add sub Items in tree widget
    QModelIndex m_modelIndex;


    //! To add sub Items in tree widget
    QTreeWidgetItem *m_Childlist ;
    int index;

    //! Menu showing the list of added classroom from classroom button
    QMenu m_classRoomListMenu;
    QStringList m_strlistMenu;
    QString m_strTempName;

private slots:
    void openClassInClientArea();

    private:
    void test();
    QAction *acttest;
    QMenu menu;
};

#endif // MAINWINDOW_H


source file
-------------------

SingleClass SingleClassobj;


MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QWidget::showMaximized();

    m_ClassRoom = new QList<QTreeWidgetItem *>;

    ui->treeWidget->setContextMenuPolicy(Qt::CustomContextMenu);
    ui->treeWidget->setColumnCount(2);
    ui->treeWidget->setColumnWidth(0,200);
    QStringList columns;
    columns << tr( "Classrooms/computers" ) << tr( "IP-address" );
    ui->treeWidget->setHeaderLabels(columns);
    connect(ui->treeWidget, SIGNAL(customContextMenuRequested(const QPoint &)),
            this, SLOT(ContextMenuDisplayMethod(const QPoint &)));
    //!
    m_actionClassroom = new QAction(tr("Add ClassRoom"),ui->treeWidget);
    m_actionComputer = new QAction(tr("Add Computer"),ui->treeWidget);

    //! For context menu display methode in treewidget
    connect(m_actionClassroom, SIGNAL(triggered()), this, SLOT(addClassRoom()));
    connect(m_actionComputer, SIGNAL(triggered()),this, SLOT(addComputers()));

    contextMenu.addAction(m_actionClassroom);
    contextMenu.addAction(m_actionComputer);

    //! To hide client setting dialog
    m_clientSettingsDlgobj.hide();

    acttest = new QAction(m_strTempName,ui->toolButton_3);

}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::addComputers()
{
    if(m_ClassRoom->size() == 0)
    {
        if( QMessageBox::question( window(), tr( "Missing classroom" ),
                                                tr( "Before adding computers "
                                                        "you have to "
                                                        "create at least one "
                                                        "classroom.\nDo you "
                                                        "want to create a new "
                                                        "classrom now?" ),
                                                QMessageBox::Yes,
                                                QMessageBox::No ) ==
                                                        QMessageBox::No )
        {
           return;
        }
         addClassRoom();
    }
    else
    {
        if(m_clientSettingsDlgobj.exec())
        {
            m_strIpEntered = m_clientSettingsDlgobj.getIP();;
            m_strClassRoomSel = m_clientSettingsDlgobj.getSelClassRoom();
            m_strUserNameEnter = m_clientSettingsDlgobj.getUserName();
            if(m_strUserNameEnter.isEmpty())
            {
                m_strUserNameEnter = m_strIpEntered;
            }
            temp = ui->treeWidget->findItems(m_strClassRoomSel , Qt::MatchExactly);
            QTreeWidgetItemIterator it(ui->treeWidget);

            for(int i = 0; i < ui->treeWidget->topLevelItemCount(); i++)
            {

                QTreeWidgetItem *parent = ui->treeWidget->topLevelItem(i);
                if(parent->text(0) == m_strClassRoomSel)
                {
                    m_Childlist = new QTreeWidgetItem(parent);
                    m_Childlist->setText(0, m_strUserNameEnter);
                    m_Childlist->setText(1, m_strIpEntered);

                    return;
                }
            }
        }

    }
}

void MainWindow::addClassRoom()
{
    bool bOk = false;
    QString classroom_name = QInputDialog::getText( this,
                    tr( "New classroom" ),
                    tr( "Please enter the name of the classroom you "
                                                    "want to create." ),
                    QLineEdit::Normal, tr( "New classroom" ), &bOk );

    if(!classroom_name.isEmpty())
    {
        bool bTemp = false;
        for(int i = 0; i < m_strlistClassRoom.size(); i++)
        {
            if(m_strlistClassRoom.at(i) == classroom_name)
                bTemp = true;
        }
        if(bTemp == false)
        {
            m_strlistClassRoom.append(classroom_name);
            m_treelist = new QTreeWidgetItem;
            m_treelist->setText(0,classroom_name);
            m_ClassRoom->append(m_treelist);

            ui->treeWidget->addTopLevelItem(m_treelist);

            SingleClassobj.setSingleClass(classroom_name);
        }

    }

    for(int i = 0; i <SingleClassobj.getSingleCLass().size() ; i++)
    {
        m_clientSettingsDlgobj.setClassComboBox(SingleClassobj.getSingleCLass().at(i));

    }

    //! To set menu in classroom toolButton
    test();

}


void MainWindow::ContextMenuDisplayMethod(const QPoint &pt)
{
    contextMenu.popup(QCursor::pos());
    contextMenu.exec(QCursor::pos());
}

void MainWindow::on_toolButton_3_clicked()
{

    qDebug()<<"INside toolButton";
    ui->toolButton_3->showMenu();
    menu.exec();

}

void MainWindow::openClassInClientArea()
{
   // QAction * act = m_classRoomListMenu.activeAction();
    QAction * act =  ui->toolButton_3->defaultAction();

    QString strClassroom = act->text();

    qDebug()<<"Class rRoom : "<<strClassroom;
    //QList<QTreeWidget> treewidgetchildren = ui->treeWidget->findChildren<QTreeWidget>(strClassroom);

}

void MainWindow::test()
{
    bool bTemp = false;

    for(int i = 0; i < m_strlistClassRoom.size(); i++)
    {
        bTemp = false;
        m_strTempName = ("ClassRoom ")+ m_strlistClassRoom.at(i);
        acttest = new QAction(m_strTempName,ui->toolButton_3);
        for(int j = 0; j < m_strlistMenu.size(); j++)
        {
            if(m_strlistMenu.at(j) == m_strTempName)
            {
                bTemp = true;
            }

        }
        if(bTemp == false)
        {
            acttest->setText(m_strTempName);
            m_strlistMenu.append(m_strTempName);
            //m_classRoomListMenu.addAction(m_strTempName);
            qDebug()<<"MainWindow::test() : acttest value : "<<acttest->text();
            ui->toolButton_3->addAction(acttest);
        }
    }
    connect(acttest, SIGNAL(triggered()),
            this, SLOT(openClassInClientArea()));

}

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Now i'm able to trigger the action. but how to get, which action is triggered. i mean in open openClassInClientArea() how ll i know that which action is triggered.

[Lykurg]

1. the connect must inside the loop!
2. to find what button/action was clicked use a QSignalMapper or QObject::sender().

[phillip_Qt]

1. the connect must inside the loop!
2. to find what button/action was clicked use a QSignalMapper or QObject::sender().

Thank u Lykurg for quick reply.

[*]the connect must inside the loop!

do u mean like

void MainWindow::test()
{
    bool bTemp = false;
 
    for(int i = 0; i < m_strlistClassRoom.size(); i++)
    {
        bTemp = false;
        m_strTempName = ("ClassRoom ")+ m_strlistClassRoom.at(i);
        acttest = new QAction(m_strTempName,ui->toolButton_3);
        for(int j = 0; j < m_strlistMenu.size(); j++)
        {
            if(m_strlistMenu.at(j) == m_strTempName)
            {
                bTemp = true;
            }
         }
        if(bTemp == false)
        {
            acttest->setText(m_strTempName);
            m_strlistMenu.append(m_strTempName);
            //m_classRoomListMenu.addAction(m_strTempName);
            qDebug()<<"MainWindow::test() : acttest value : "<<acttest->text();
            ui->toolButton_3->addAction(acttest);
        }
    connect(acttest, SIGNAL(triggered()),
            this, SLOT(openClassInClientArea()));
    }
}

void MainWindow::test()
{
    bool bTemp = false;
 
    for(int i = 0; i < m_strlistClassRoom.size(); i++)
    {
        bTemp = false;
        m_strTempName = ("ClassRoom ")+ m_strlistClassRoom.at(i);
        acttest = new QAction(m_strTempName,ui->toolButton_3);
        for(int j = 0; j < m_strlistMenu.size(); j++)
        {
            if(m_strlistMenu.at(j) == m_strTempName)
            {
                bTemp = true;
            }
         }
        if(bTemp == false)
        {
            acttest->setText(m_strTempName);
            m_strlistMenu.append(m_strTempName);
            //m_classRoomListMenu.addAction(m_strTempName);
            qDebug()<<"MainWindow::test() : acttest value : "<<acttest->text();
            ui->toolButton_3->addAction(acttest);
        }
    connect(acttest, SIGNAL(triggered()),
            this, SLOT(openClassInClientArea()));
    }
}

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and also

void MainWindow::openClassInClientArea()
{
    QString strClassroom = acttest->sender()->objectName();
}

void MainWindow::openClassInClientArea()
{
    QString strClassroom = acttest->sender()->objectName();
}

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is giving error as objectname() is private methode of QObject. Can u plz suggest me how to do?

[Lykurg]

Can u plz suggest me how to do?

Yes, read the docs to QObject::sender()

Better would be using a QSignalMapper, but if you want use the sender() see what is the output of

void MainWindow::openClassInClientArea()
{
    qWarning() << QObject::sender();
}

void MainWindow::openClassInClientArea()
{
    qWarning() << QObject::sender();
}

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when you click the different buttons.

[phillip_Qt]

Yes, read the docs to QObject::sender()

Better would be using a QSignalMapper, but if you want use the sender() see what is the output of

void MainWindow::openClassInClientArea()
{
    qWarning() << QObject::sender();
}

void MainWindow::openClassInClientArea()
{
    qWarning() << QObject::sender();
}

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when you click the different buttons.

Thank u very much
I put following inside the loop

connect(acttest, SIGNAL(triggered()),
            this, SLOT(openClassInClientArea()));
            strClassroom = acttest->text();

connect(acttest, SIGNAL(triggered()),
            this, SLOT(openClassInClientArea()));
            strClassroom = acttest->text();

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and its workig fine.
Thank u very much.

[phillip_Qt]

Yes, read the docs to QObject::sender()

Better would be using a QSignalMapper, but if you want use the sender() see what is the output of

void MainWindow::openClassInClientArea()
{
    qWarning() << QObject::sender();
}

void MainWindow::openClassInClientArea()
{
    qWarning() << QObject::sender();
}

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when you click the different buttons.

Hi
m_classroomActionList->sender()->objectName(); is giving error.
error: `QObject* QObject::sender() const' is protected.

[Lykurg]

Hi
m_classroomActionList->sender()->objectName(); is giving error.
error: `QObject* QObject::sender() const' is protected.

Because you have to use

QObject::sender();//or
sender();

QObject::sender();//or
sender();

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and NOT

m_classroomActionList->sender();

m_classroomActionList->sender();

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!!! Like I wrote in the small example!

[phillip_Qt]

Because you have to use

QObject::sender();//or
sender();

QObject::sender();//or
sender();

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and NOT

m_classroomActionList->sender();

m_classroomActionList->sender();

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!!! Like I wrote in the small example!

But

strClassroom = QObject::sender()->objectName();

strClassroom = QObject::sender()->objectName();

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is returning a null string .

[phillip_Qt]

But

strClassroom = QObject::sender()->objectName();

strClassroom = QObject::sender()->objectName();

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is returning a null string .

I'm stuck with the problem. Plz help me.

[Lykurg]

maybe it's because your sender object has no name! QObject::sender()->objectName() works perfect for me. And by the way, you don't need that name:

if (QObject::sender() == ui->button1)
  //...

if (QObject::sender() == ui->button1)
  //...

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But that is not a good style, so better use QSignalMapper...

[phillip_Qt]

maybe it's because your sender object has no name! QObject::sender()->objectName() works perfect for me. And by the way, you don't need that name:

if (QObject::sender() == ui->button1)
  //...

if (QObject::sender() == ui->button1)
  //...

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But that is not a good style, so better use QSignalMapper...

Thank u Lykurg.
i did like following

QSignalMapper * signalMapper;// data member  and allocate memory in c'tor
 
        connect(m_classroomActionList, SIGNAL(triggered()),
            this, SLOT(openClassInClientArea()));
 
        connect(m_classroomActionList, SIGNAL(triggeredd()),
            signalMapper, SLOT(map()));
 
        connect(signalMapper, SIGNAL(mapped(const QString &)),
            this, SIGNAL(clicked(const QString &)));

QSignalMapper * signalMapper;// data member  and allocate memory in c'tor

        connect(m_classroomActionList, SIGNAL(triggered()),
            this, SLOT(openClassInClientArea()));

        connect(m_classroomActionList, SIGNAL(triggeredd()),
            signalMapper, SLOT(map()));

        connect(signalMapper, SIGNAL(mapped(const QString &)),
            this, SIGNAL(clicked(const QString &)));

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but signalMapper->objectName(); is returning null. can u plz tell me whats the mistake in my code. i'm totally stuck with this problem since last 2 days.