CODEWITHSUNDEEP
c++qt
Ricardo Silveira
Ricardo Silveira

Reputation: 1243

How to insert items dynamically in scroll area and loading the scroll bar in Qt?

Before we start things, this could be a possible duplicate of Qt Scroll Area does not add in scroll bars, however the answer provided by the user and which seemed to work for the OP, does not work for me. I fear it may have to do with versions, perhaps? Or am I missing something? (it is possible!)

Alright, for those who know Qt, I am a beginner and I have what seem to be a pretty silly problem, but is giving me a lot of headaches:

I want to press a push button and add items to a container, then it is supposed to be possible to scroll it down. As simple as that.

So I thought that perhaps setting a layout to scrollArea would do the job. It indeed adds my items as I wanted, but it doesn't load the scrollBar. I have checked the ScrollPolicy already, but nothing satisfied my issue. It is like the GVBoxLayout doesn't increase size and doesn`t let the scroll area to scroll.

Does anybody have a clue on how to fix it?

Code below:

saleWindow.h

#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QListWidget>
#include<QString>

namespace Ui {
class SaleWindow;
}

class SaleWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit SaleWindow(QWidget *parent = 0);
    ~SaleWindow();

private slots:
    void on_pushButton_clicked();


private:
    Ui::SaleWindow *ui;
    QVBoxLayout *gBoxLayout;
    QMap<QString, QListWidget *>  m_mappings;
};

#endif // SALEWINDOW_H

saleWindow.cpp

#include "salewindow.h"
#include "ui_salewindow.h"
#include <iostream>
#include <QGroupBox>
#include <QLabel>
//#include <QtSql/QSqlDatabase>
//#include <QtSql>
#include <QtWidgets/QPushButton>


SaleWindow::SaleWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::SaleWindow),
    gBoxLayout(new QVBoxLayout())
{

    ui->setupUi(this);

    // Adding layout to scrollbar
    {

        ui->scrollArea_sales->setWidgetResizable(true);
        ui->scrollArea_sales->setLayout(gBoxLayout);
        QWidget *central = new QWidget;
        ui->scrollArea_sales->setWidget(central);
    }
}

SaleWindow::~SaleWindow()
{
    delete ui;
    delete gBoxLayout;
}

void SaleWindow::on_pushButton_clicked()
{
    QGroupBox *sale = new QGroupBox();
    sale->setTitle("minha venda");
    gBoxLayout->addWidget(sale);
    ui->scrollArea_sales->setLayout(gBoxLayout);
}

Upvotes: 4

Views: 3608

Answers (1)

Alvaro Denis Acosta
Alvaro Denis Acosta

Reputation: 815

If you are using a QScrollArea for the scrollArea_sales object from the ui editor, you can see in the object inspector(qtdesigner) a default widget in the QScrollArea, so you not need to add this. Try this code:

// Adding layout to scrollbar(on the contrctor, replace yor scope by)
{
   ui->scrollArea_sales->widget()->setLayout(gBoxLayout);
}

void MainWindow::on_pushButton_clicked() {// on the slot replace all by:
  QGroupBox *sale = new QGroupBox();
  sale->setTitle("minha venda");
  ui->scrollArea_sales->widget()->layout()->addWidget(sale);
}

Upvotes: 2

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