如何验证是否选中了多个复选框

Question

std::string output; 

if ((checkbox1->isChecked() && checkbox2->isChecked()) && 
   (!checkbox3->isChecked() || !checkbox4->isChecked() || !checkbox5->isChecked() || !checkbox6->isChecked()))
{
  output = " Using Checkbox: 1, 2 ";
}

if ((checkbox1->isChecked() && checkbox2->isChecked() && checkbox3->isChecked()) && 
   (!checkbox4->isChecked() || !checkbox5->isChecked() || !checkbox6->isChecked()))
{
  output = " Using Checkbox: 1, 2, 3 ";
}

....

using QT creator how can I verify how many checkboxes have been checked and change the output string accordingly? with multiple if statements it's not working due to me getting confused with all those NOT AND OR. and it takes a long time to code all possibilities.

Answer 1

All your checkBoxes should be in groupBox

Try this:

QList<QCheckBox *> allButtons = ui->groupBox->findChildren<QCheckBox *>();
qDebug() <<allButtons.size();
for(int i = 0; i < allButtons.size(); ++i)
{
    if(allButtons.at(i)->isChecked())
        qDebug() << "Use" << allButtons.at(i)->text()<< i;//or what you need
}

Answer 2

Use an array of checkboxes like this

// h-file
#include <vector>
class MyForm {
...
    std::vector< QCheckBox* > m_checkBoxes;
};
// cpp-file
MyForm::MyForm() {
...
    m_checkBoxes.push_back( checkbox1 );
    m_checkBoxes.push_back( checkbox2 );
    ... 
    m_checkBoxes.push_back( checkbox5 );
}
...
    output = " Using Checkbox:";
    for ( int i = 0, size = m_checkBoxes.size(); i < size; ++i ) {
        if ( m_checkBoxes[ i ]->isChecked() ) {
            output += std::to_string( i + 1 ) + ", ";
        }
    }

Answer 3

TLDR: Place them in a container and build your string by iterating over them.

Code:

// line taken from @Chernobyl
QList<QCheckBox *> allButtons = ui->groupBox->findChildren<QCheckBox *>();

auto index = 1;
std::ostringstream outputBuffer;
outputBuffer << "Using Checkbox: ";
for(const auto checkBox: allButtons)
{
    if(checkBox->isChecked())
        outputBuffer << index << ", ";
    ++index;
}
auto output = outputBuffer.str();

Answer 4

Use QString instead of std::string and then:

QCheckBox* checkboxes[6];
checkbox[0] = checkbox1;
checkbox[1] = checkbox2;
checkbox[2] = checkbox3;
checkbox[3] = checkbox4;
checkbox[4] = checkbox5;
checkbox[5] = checkbox6;

QStringList usedCheckboxes;
for (int i = 0; i < 6; i++)
{
    if (checkbox[i]->isChecked())
        usedCheckboxes << QString::number(i+1);
}

QString output = " Using Checkbox: " + usedCheckboxes.join(", ") + " ";

This is just an example, but there's numerous ways to implement this. You could keep your checkboxes in the QList which is a class field, so you don't have to "build" the checkboxes array every time. You could also use QString::arg() instead of + operator for string when you build the output, etc, etc.

What I've proposed is just a quick example.