Checking if the button in a QPushButtonArray is not a specific button

patelvrajn

Hello,

I am trying to create a function that iterates through a Layout and stores the list of QPushButtons in a QList. After it has stored the QPushButtons into a list I want to iterate through the list and check whether or not the specific QPushButton is the one I am looking for. The reason for this function is so I may "unhighlight" all other buttons when this function is called by the on-click slot of one of the buttons.

The highlight and unhighlight actions are as follows (however, I want a generalized function not one that checks if the button has a certain stylesheet):

Highlight

    buttonx->setStyleSheet("border: 1px solid #ffffff; background: #DFDFDF; border-radius: 25px;");

Unhighlight

    buttonx->setStyleSheet("border: 1px solid #ffffff; background: white");

My current progress in the code is as follows where Tabs_List is a QList of QPushButton Type however, I cannot seem to push the Buttons to the end of the list because of the following error:

error: reference to type 'const QPushButton' could not bind to an rvalue of type 'QLayoutItem *'

How do I fix this? Additionally I cannot seem to find a method allowing me to see if a button in the array is the same button as the active button (the button I don't want to unhighlight) specified in the parameter. I assume there is some way via pointers by comparing the addresses of the buttons but I am not sure.

QVBoxLayout Tabs_Grid = new QVBoxLayout();

void MainWindow::toggleActiveButton(QPushButton *active)
{
    QList<QPushButton> tabs_list;
    if(Tabs_Grid->takeAt(0)->widget()->metaObject()->className() == "QPushButton")
    {
        tabs_list.push_back(Tabs_Grid->takeAt(0));
    }
}

Any help is greatly appreciated.

Christian Ehrlicher

@patelvrajn said in Checking if the button in a QPushButtonArray is not a specific button:

Tabs_Grid->takeAt(0)->widget()

Here you're accessing correctly the widget but not the line below.

patelvrajn

@Christian-Ehrlicher

I purposely omitted the part after takeAt because whether I put Widget or not it, the same type of error ensues. The error I get for replacing that line with:

tabs_list.push_back(Tabs_Grid->takeAt(0)->widget());

is:

reference to type 'const QPushButton' could not bind to an rvalue of type 'QWidget *'

jsulm

@patelvrajn You should change

QList<QPushButton> tabs_list;

to

QList<QPushButton*> tabs_list;

QObject instances are not copyable.
Currently you're trying to push_back a pointer where an instance is expected, this is not going to work.

patelvrajn

That worked! I did not realize I was sending a pointer into an array of instances, thank you! I also figured out the rest of the code I needed assistance on, on my own. For those who need a reference for this type of situation, this is the resultant solution:

void MainWindow::toggleActiveTab(QPushButton *active)
{
    QList<QPushButton*> tabs_list;

    std::string comparator = "QPushButton";

    for(int index = 0; index < Tabs_Grid->count(); index++)
    {
        if(strncmp(Tabs_Grid->itemAt(index)->widget()->metaObject()->className(), comparator.c_str(), (size_t) comparator.length()) == 0)
            tabs_list.push_back((QPushButton *)Tabs_Grid->itemAt(index)->widget());
    }

    while(!tabs_list.empty())
    {
        if(tabs_list.front() == active)
        {
            tabs_list.front()->setStyleSheet("border: 1px solid #ffffff; background: #DFDFDF; border-radius: 25px;");
            tabs_list.pop_front();
            continue;
        }
        tabs_list.front()->setStyleSheet("border: 1px solid #ffffff; background: white");
        tabs_list.pop_front();
    }
}

J.Hilk

@patelvrajn you should keep in mind, that setStyleSheet calls are rather expensive. If you do this a lot of times for a whole bunch of objects.

There are other ways to influence the stylesheet/appearance of on object
take a look here, to learn more about QStylesheet and dynamic properties;:

https://wiki.qt.io/Dynamic_Properties_and_Stylesheets