my slots don't appear in the signal slot editor

I don't mind coding my own connect statements but I am trying to learn Qt designer

This code works!

Code:

---

// part of the .h file
private:
    Ui::ECalc1Class ui;
 
private slots:               // my methods...yes I tried public:
  void addClicked();
  void subClicked();
  void mulClicked();
  void divClicked();
 
____________________________________________
 
#include "ecalc1.h"
#include <QMessageBox>
ECalc1::ECalc1(QWidget *parent)
    : QWidget(parent)
{
	ui.setupUi(this);
	connect( ui.pushButtonAdd, SIGNAL(clicked()), this, SLOT(addClicked()) );
	connect( ui.pushButtonSub, SIGNAL(clicked()), this, SLOT(subClicked()) );
	connect( ui.pushButtonMul, SIGNAL(clicked()), this, SLOT(mulClicked()) );
	connect( ui.pushButtonDiv, SIGNAL(clicked()), this, SLOT(divClicked()) );
}

---

QtDesigner doesn't pull the slots from your source code, but from the ui file. So if you want to access them via designer, you'll need to right click an object and use the "change signals/slots" menu item. Add them there and they will appear.

BTW, the generated code by designer calls connectSlotsByName() which means that if you have a function like "void on_button1_clicked();" you don't need to connect() it, as it'll be done for you when you call setupui(). Saves doing it yourself.

you'll need to right click an object and use the "change signals/slots" menu item.

where do I find these objects?

I have a column "project explorer" and other columns but I do not see any window containing "objects"

OOPS! BTW I am using the Eclipse QT designer plugin!

The program works but....

Found the "object"

I added addClicked() to the list of slots but the slots in the editor is grayed out

the slots are grayed out in the editor (drag a red line)

so I went to the "other "editor below and entered 3 more connects.

The program now works (as it did when I wrote the connect statements myself.)

Code:

---

#include "trycalc.h"
#include <QMessageBox>
trycalc::trycalc(QWidget *parent)
    : QWidget(parent)
{
	ui.setupUi(this);
	connect(ui.pushButtonAdd,SIGNAL(clicked()),this,SLOT(addClicked()));
}

---

Final questions are:
(1) why are all slots grayed out in the "drag red line editor from "above" button" list?
These "gray" slots are NOT grayed out in the "connect" editor below
(2) where are the other 3 connect statements???

answer to (2) : buried in the hieroglyphics of a .moc file. I guess this is to be expected since the .cpp file is not at all generated by a tool! My single connect statement remains.

and my connect statement did not show up in the signal/slot editor below!

slots will be grayed out if the slot is incompatible with the signal. For example, a slot expecting an int will not accept a signal that emits a char *

All connect statements generated by designer will be present in the header file and executed when setupui is called.

OK but why do these slots show up as choices in the Qt C++ signal slot tab below???

and with "my" connect statement tha works, how do I fix the other 3

for subtract, mutiply and divide

connect(ui.pushButtonAdd,SIGNAL(clicked()),this,SL OT(addClicked()));

QAbstratButton has
Signals

*
void clicked ( bool checked = false ) argument optional
*
void pressed ()
*
void released ()
*
void toggled ( bool checked )

*
1 signal inherited from QWidget
*
1 signal inherited from QObject

My slots are all void void

Your slots shouldn't be all void void. If there are no parameters, the parameter list should be empty, otherwise the slots will be grayed out in designer.

If you create a slot in designer and name it "foo()", then it will allow you to assign the clicked() event to that slot using the "Edit signals/slots" editor (ie, you drag a line from the button to whatever)

If you are still having problems, post your project.

I have tar'ed and gzip'ed the workspace (Eclipse) for the project attached

If you don't have Eclipse with Qt designer plugin, I can export the files and "retar"

You seem to have forgotten to attach the project.

Secondly, have you tried to open the .ui file in QtDesigner itself rather than the Eclipse plugin to make sure it isn't a bug in the plugin?

I exported necessary files via tar and gzip.

I removed *.o and executable

-rw-rw-r--. 1 qt4 qt4 1225203 2009-12-02 19:04 trycalc.tar.gz
too big to attach.

Do you have an email I could send it to?

I will try using the designer alone to look at what is going on!

where does one say thanks!

this time I clicked on "edit" and was allowed to enter the 4 methods/slots.

However when I dragged the red line out of a pushbutton, the choices were grayed out.

This looks like a bug or missing feature.

Who wants to limit slots to base class slots?

Again, the C++ signal slot editor tab near the bottom shows and allows selection of user slots.

Hitting F4 or the editor that pops up from the icon at the top doesn't allow

may be this:

Code:

---

clicked(bool c = false)

---

? void is actually not equal to default argument.

Please edit your posts if you have anything to add instead of replying to yourself.

wysota:
just curious...are you a Nokia (formerly Trolltech) employee??

Tanuli-no:
thanks! clicked(bool c = false) occurred to me even though it is really unnecessary.

Come to think of it,
he whole original parameter spec should really be used anyway!

Assuming that is correct (I think it is) why are the user slots appearing at the bottom dialog (tab) and not at the top dialog (F4/icon)?
The following compiled and ran but with warning:
Object::connect: No such signal QPushButton::clicked(bool c) in trycalc.cpp:7
Object::connect: (sender name: 'pushButtonAdd')
Object::connect: (receiver name: 'trycalcClass')

Code:

---

#ifndef TRYCALC_H
#define TRYCALC_H
 
#include <QtGui/QWidget>
#include "ui_trycalc.h"
 
class trycalc : public QWidget
{
    Q_OBJECT
 
public:
    trycalc(QWidget *parent = 0);
    ~trycalc();
 
private:
    Ui::trycalcClass ui;
public slots:
  void addClicked(bool c = false);
  void subClicked(bool c = false);
  void mulClicked(bool c = false);
  void divClicked(bool c = false);
 
};
 
#endif // TRYCALC_H
 
 
#include "trycalc.h"
#include <QMessageBox>
trycalc::trycalc(QWidget *parent)
    : QWidget(parent)
{
	ui.setupUi(this);
	connect(ui.pushButtonAdd,SIGNAL(clicked(bool c)),this,SLOT(addClicked(bool c;
}
 
trycalc::~trycalc()
{
 
}
//
void trycalc::addClicked(bool c)
{
 
        QString qstring1 = ui.lineEdit->text();
        QString qstring2 = ui.lineEdit_2->text();
 
        bool ok1 = true;
        bool ok2 = true;
        float f1 = qstring1.toFloat(&ok1);
        float f2 = qstring2.toFloat(&ok2);
        if(        qstring1.length() == 0
                || qstring2.length() == 0
                || !ok1
                || !ok2)
        {
            QMessageBox mb("Adder",
                           "missing or bad entry",
                           QMessageBox::Warning,
                           QMessageBox::Ok ,
                           QMessageBox::NoButton ,
                           QMessageBox::NoButton);
                mb.exec();
                ui.lineEdit->clear();
                ui.lineEdit_2->clear();
                ui.lineEdit_3->clear();
                return;
        }
        float f3 = f1 + f2;
        QString qstring3;
        qstring3.setNum(f3);
        ui.lineEdit_3->setText(qstring3);
}
void trycalc::subClicked(bool c)
{
        QString qstring1 = ui.lineEdit->text();
        QString qstring2 = ui.lineEdit_2->text();
 
        bool ok1 = true;
        bool ok2 = true;
        float f1 = qstring1.toFloat(&ok1);
        float f2 = qstring2.toFloat(&ok2);
        if(        qstring1.length() == 0
                || qstring2.length() == 0
                || !ok1
                || !ok2)
        {
            QMessageBox mb("Adder",
                           "missing or bad entry",
                           QMessageBox::Warning,
                           QMessageBox::Ok ,
                           QMessageBox::NoButton ,
                           QMessageBox::NoButton);
                mb.exec();
                ui.lineEdit->clear();
                ui.lineEdit_2->clear();
                ui.lineEdit_3->clear();
                return;
        }
        float f3 = f1 - f2;
        QString qstring3;
        qstring3.setNum(f3);
        ui.lineEdit_3->setText(qstring3);
}
void trycalc::mulClicked(bool c)
{
 
        QString qstring1 = ui.lineEdit->text();
        QString qstring2 = ui.lineEdit_2->text();
 
        bool ok1 = true;
        bool ok2 = true;
        float f1 = qstring1.toFloat(&ok1);
        float f2 = qstring2.toFloat(&ok2);
        if(        qstring1.length() == 0
                || qstring2.length() == 0
                || !ok1
                || !ok2)
        {
            QMessageBox mb("Adder",
                           "missing or bad entry",
                           QMessageBox::Warning,
                           QMessageBox::Ok ,
                           QMessageBox::NoButton ,
                           QMessageBox::NoButton);
                mb.exec();
                ui.lineEdit->clear();
                ui.lineEdit_2->clear();
                ui.lineEdit_3->clear();
                return;
        }
        float f3 = f1 * f2;
        QString qstring3;
        qstring3.setNum(f3);
        ui.lineEdit_3->setText(qstring3);
}
void trycalc::divClicked(bool c)
{
 
        QString qstring1 = ui.lineEdit->text();
        QString qstring2 = ui.lineEdit_2->text();
 
        bool ok1 = true;
        bool ok2 = true;
        float f1 = qstring1.toFloat(&ok1);
        float f2 = qstring2.toFloat(&ok2);
        if(        qstring1.length() == 0
                || qstring2.length() == 0
                || !ok1
                || !ok2
                || f2==0.)
        {
            QMessageBox mb("Adder",
                           "missing or bad entry",
                           QMessageBox::Warning,
                           QMessageBox::Ok ,
                           QMessageBox::NoButton ,
                           QMessageBox::NoButton);
                mb.exec();
                ui.lineEdit->clear();
                ui.lineEdit_2->clear();
                ui.lineEdit_3->clear();
                return;
        }
        float f3;
        if (f2 != 0.) f3 = f1 / f2;
        QString qstring3;
        qstring3.setNum(f3);
        ui.lineEdit_3->setText(qstring3);
}

---

Quote:

---

Originally Posted by landonmkelsey

wysota:
just curious...are you a Nokia (formerly Trolltech) employee??

---

No, I'm not.

What is this?

Code:

---

void addClicked(bool c = false);
  void subClicked(bool c = false);
  void mulClicked(bool c = false);
  void divClicked(bool c = false);

---

If you don't care about the state, it should be:

Code:

---

void addClicked();
  void subClicked();
  void mulClicked();
  void divClicked();

---

As mentioned previously.

somebody recommended a fix and I was giving it a shot

Your recommendation describes my original code.

My original code compiled and ran without warning/error.

Attach your .ui file

attached but....one could( in 30 seconds), simply drag 3 lineedtit controls and a pushbutton onto the designer surface and try what is supposed to be the purpose of the designer

code produced from a graphical start...the slots are coded, connects are coded, etc

the original question. was:

So what's the problem exactly? The slots you added are available in Designer's signal/slot editor. Isn't it what you wanted?

from first post

(1) why are all slots grayed out in the "drag red line" editor from F4 or

the edit signals/slots icon above but

These "grayed" slots are NOT grayed out in the "C++ Signals/Slotst" editor tab below

Quote:

---

Originally Posted by landonmkelsey

attached but....one could( in 30 seconds), simply drag 3 lineedtit controls and a pushbutton onto the designer surface and try what is supposed to be the purpose of the designer

---

Yes, and we said that worked fine for us, hence the reason for wanting YOUR ui file which you said doesn't work.

I've just opened your ui file, deleted the connections, and then use the red line signal slot editor to connect the buttons to your appropriate functions (addClicked, etc) with no problems at all. I didn't have to use the bottom box at all.

So, whats the problem? You ARE selecting a signal before attempting to select a slot? Otherwise the slots WILL be grayed out as they are not usable at that stage.

I give up!

thanks anyway!

Maybe you are using some very old version of Designer which had that functionality broken?

I have the latest Fedora Linux 12 updates

same for eclipse and the plugin

I'll try it again after the next update...thanks!

Next will probably be 4.6!
BTW

[qt4@localhost Downloads]$ rpm -qa|grep qt
poppler-qt4-0.12.2-1.fc12.i686
qt-4.5.3-9.fc12.i686
qt-sqlite-4.5.3-9.fc12.i686
PackageKit-qt-0.5.4-0.4.20091029git.fc12.i686
qwtplot3d-qt4-0.2.7-9.fc12.i686
qtoctave-0.8.1-0.20080826.svn165.fc12.i686
qt-x11-4.5.3-9.fc12.i686
avahi-qt3-0.6.25-5.fc12.i686
qt-qsa-1.1.5-7.fc12.i686
qt-devel-4.5.3-9.fc12.i686
qtscriptbindings-0.1.0-8.fc12.i686
pinentry-qt-0.7.6-4.fc12.i686
qt3-devel-3.3.8b-28.fc12.i686
qt3-designer-3.3.8b-28.fc12.i686
qt3-3.3.8b-28.fc12.i686
ibus-qt-1.2.0.20091014-1.fc12.i686
[qt4@localhost Downloads]$

From the Qt Designer help/about dialog:

About Qt
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