[QWizard] How to disable the Next button in a wizard until a certain condition is met

pkjag

Hi all
I was wondering how i would disable the Next button in a wizard page until i have set only four checkboxes checked or clicked them among a bunch of other checkboxes in the wizard page?

p3c0

1.When ever the checkboxes are clicked, check the state of all checkboxes
2. Get the pointer to "Next" button using wizard->button(WizardButton which) and then use setEnabled(bool) as per the requirement

SGaist

Hi and welcome to devnet,

You might be interested by re-implementing "QWizardPage::isComplete":http://qt-project.org/doc/qt-4.8/qwizardpage.html#isComplete

Hope it helps

sierdzio

Or subclass QWizardPage and reimplement isCompleted.

pkjag

Thank you all for replying.
So i did this:

@
connect(checkmeCheckBox, SIGNAL(stateChanged(), QWizard::NextButton, SLOT(nextId())));
...
...
...
//for all the checkboxes

int myclass::nextId()
{
//then i got stuck here since you can't evaluate the logic for all the four checkboxes since there are like a total of 10 of them and i want to select any four from the 10??
}
@

pkjag

Hey
Is there no actual help in this forum, where did everyone go??
I've been waiting for like 4 hours!!!! ):

SGaist

Please, wait at least 24 to 72 hours before bumping your own thread. Most people answering here do it on their free time. Also not everybody lives in the same timezone as you.

If you're in need of rapid support you can contact Digia/KDAB/ICS etc...

sierdzio

Mate, there is no magic automated solution here. This is custom behaviour and you need to sit down, think about it and implement the code.

Regardless of how many checkboxes you have, be it 10 or a hundred, you need to go through them all and count how many are checked.

p3c0

pkjag,
Once you subclass QWizardPage, you will get access to the "Next" button using the wizard()->button(QWizard::NextButton). When you check any checkbox, call a common slot and check there the status of all the checkboxes and depending upon your condition call set the "Next" button state using @wizard()->button(QWizard::NextButton)->setEnabled(true)@ or @wizard()->button(QWizard::NextButton)->setEnabled(false)@

pkjag

So i did this:
@
connect(checkmeCheckBox, SIGNAL(toggled()),wizard1->button(QWizard::NextButton), SLOT(reactToToggle()));
...
...
...
//for all the checkboxes in myPage

int myPage::reactToToggle(bool checked)
{
static int i = 0;
if(checked)
++i;
return i;
}

void myPage::returns(bool checked)
{
if(reactToToggle(checked)== 3)
wizard1->button(QWizard::NextButton)->setEnabled(true);
else
wizard1->button(QWizard::NextButton)->setDisabled(true);
}
@
but the compiler returns a SIGSEGV error, is there anything wrong with my implementation apart from the SIGSEGV exception???

p3c0

Hi,

Please check the following code:
Check the SLOT CheckAllCheckBoxes(bool)

installer.cpp

@#include "installer.h"

Installer::Installer(QWidget *parent)
: QWizard(parent)
{
setPage(Page_Intro, new IntroPage);
setPage(Page_Register, new RegisterPage);
setStartId(Page_Intro);
setWindowTitle(tr("Test Wizard"));

}

Installer::~Installer()
{

}

IntroPage::IntroPage(QWidget *parent)
: QWizardPage(parent)
{
setTitle(tr("Introduction"));
}

void IntroPage::initializePage()
{
topLabel = new QLabel(tr("Test Wizard. \n Please click next to install"));
topLabel->setWordWrap(true);

m_one = new QCheckBox();m_one->setText("one");
connect(m_one,SIGNAL(clicked(bool)),this,SLOT(CheckAllCheckBoxes(bool)));
m_two = new QCheckBox();m_two->setText("two");
connect(m_two,SIGNAL(clicked(bool)),this,SLOT(CheckAllCheckBoxes(bool)));
m_three = new QCheckBox();m_three->setText("three");
connect(m_three,SIGNAL(clicked(bool)),this,SLOT(CheckAllCheckBoxes(bool)));
m_four = new QCheckBox();m_four->setText("four");
connect(m_four,SIGNAL(clicked(bool)),this,SLOT(CheckAllCheckBoxes(bool)));

QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(topLabel);

layout->addWidget(m_one);
layout->addWidget(m_two);
layout->addWidget(m_three);
layout->addWidget(m_four);
setLayout(layout);

}

bool IntroPage::validatePage()
{
return Installer::Page_Register;
}

void IntroPage::CheckAllCheckBoxes(bool state)
{
int checkcount = 0;

QList<QCheckBox *> allcheckboxes = findChildren<QCheckBox *>();
for(int i=0;i<allcheckboxes.count();i++)
{
    if(allcheckboxes.at(i)->isChecked())
        checkcount++;
}
if(checkcount>2)
    wizard()->button(QWizard::NextButton)->setEnabled(true);
else
    wizard()->button(QWizard::NextButton)->setEnabled(false);

}

//--------------------------

RegisterPage::RegisterPage(QWidget *parent)
: QWizardPage(parent)
{
setTitle(tr("Test Wizard Page 2"));
setSubTitle(tr("Please wait..."));

}

void RegisterPage::initializePage()
{
line = new QLineEdit;
line->setHidden(true);

QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(bar,1,0);
layout->addWidget(line,2,0);
setLayout(layout);

}

bool RegisterPage::validatePage()
{
}

int RegisterPage::EnableNextFinish()
{
line->setText("157");
setSubTitle("Completed");
}

bool RegisterPage::isComplete()
{
return true;
}
@

installer.h

@#ifndef INSTALLER_H
#define INSTALLER_H

#include <QtGui>

class Installer : public QWizard
{
Q_OBJECT

public:
Installer(QWidget *parent = 0);
enum { Page_Intro,Page_Register};
~Installer();
};

class IntroPage : public QWizardPage
{
Q_OBJECT

public:
IntroPage(QWidget *parent = 0);
bool validatePage();

void initializePage();

private:
QLabel *topLabel;
QCheckBox *m_one,*m_two,*m_three,*m_four;
QRadioButton *registerRadioButton;
QRadioButton *evaluateRadioButton;

protected slots:
void CheckAllCheckBoxes(bool state);
};

class RegisterPage : public QWizardPage
{
Q_OBJECT

public:
RegisterPage(QWidget *parent = 0);
void initializePage();
QLineEdit *line;
bool validatePage();

private:
public slots:
int EnableNextFinish();
bool isComplete();
};
#endif // INSTALLER_H
@

pkjag

Thanks p3c0
It worked save for the fact that the Next button is enabled before you actually click the checkboxes and it allows going forward to the next page.
I don't know where to call the disabling function since i tried it in the constructor and it didn't work??

p3c0

Right. Doesn't even work in initializePage(). Just wondering why it didn't work

p3c0

It works in showEvent().

Try adding this function to the above code

@void IntroPage::showEvent(QShowEvent *)
{
wizard()->button(QWizard::NextButton)->setEnabled(false);
}@

pkjag

Thanks man it worked