How to disable a QPushButton when deselect a QCheckBox

Question

I'm working in a Qt project where the user can enable or disable a QPushButton by selecting or deselecting a QCheckBox.
I have already developed a function where the mouse event enable the QPushButton, but the problem is that when i deselect the QCheckBox the QPushButton remain enabled.
Is there a Qt function to disable a button when QCheckBox are unchecked?

This is the code i wrote:

//Class.h
//Function to enable the button
private slots:
   void on_QCheckBox_clicked();
//Class.cpp
void class::on_QCheckBox_clicked() {
  ui->QPushButton->setEnabled(true);
  //Here i enabled the button with setEnabled function
}

This is the relevant part of the code...other isn't about this problem. — , Jul 28 '17 at 13:03
There is a signal named QCheckBox::stateChanged(int state), you should use it. Also you should provide the code that connects the signals together — k_kaz, Jul 28 '17 at 13:04
Qt5: `QObject::connect(pQTglBtnEn, &QCheckBox::toggled, pQBtn, &PushButton::setEnabled);` with `QCheckBox *pQTglBtn;` and `QPushButton *pQBtn;` — Scheff's Cat, Jul 28 '17 at 13:20
Qt4: `QObject::connect(pQTglBtnEn, SIGNAL(toggled(bool)), pQBtn, SLOT(setEnabled(bool)));` with `QCheckBox *pQTglBtn;` and `QPushButton *pQBtn;` — Scheff's Cat, Jul 28 '17 at 13:22
Yes, I know. ;-) You find a similar sample in my answer for [SO: QPushButton doesn't update when setDown is called](https://stackoverflow.com/a/45267593/7478597). While toying around in my local code I added exactly the feature you asked for (and tested it). — Scheff's Cat, Jul 28 '17 at 13:36

score 1 · Accepted Answer · answered Jul 28 '17 at 13:42

1

Thanks to @Scheff!

I solved by using QObject::connect() to connect my QCheckBox and my QPushButton together

Here is an example:

class::class() {
  QObject::connect(ui->QCheckBox, &QCheckBox::toggled, ui->QPushButton, &QPushButton::setEnabled);
  //Where ui->QCheckBox is the checkbox and ui->QPushButton is your button
}

answered Jul 28 '17 at 13:42

Have you really named your objects `QCheckBox` and `QPushButton`? That's really confusing. – O'Neil Jul 28 '17 at 14:54
Oh god no, It's just for this site ;-) – Jul 28 '17 at 15:17
1

@CMz So you name them horribly just to confuse everyone here? Please change that. It's really really bad and throws anyone reading this. – Kuba hasn't forgotten Monica Jul 28 '17 at 18:39

score 0 · Answer 2 · answered Jul 28 '17 at 13:08

0

You can check the state using QCheckBox::checkState() as follows:

if (QCheckBox->checkState() == Qt::Unchecked)
{
    ui->QPushButton->setEnabled(false);
}

answered Jul 28 '17 at 13:08

Arnav Borborah

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How to disable a QPushButton when deselect a QCheckBox

2 Answers2