QScrollArea with QLayout

knyitra

Each time when I push the button I would like to add a number to the top of the QVBoyLayout, and each button have to be align to the top, so there is no avaliable space between the buttons, that is why I am using addStretch(). When there is no avaliable space inside the layout, then I would like to display the slider, that is why I am using QScrollArea. But when I add to much buttons to the layout, the button shrink even though I am using setFixedHeight.

So basically I want to keep the button height fixed, and if there is no available space, display the slider.

mainwindow.h:

#pragma once

#include <QMainWindow>
#include <QFrame>
#include <QPushButton>
#include <QScrollArea>
#include <QVBoxLayout>
#include <QResizeEvent>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow {

    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QWidget* window;
    QFrame* frame;
    QScrollArea* scroll;
    QVBoxLayout* vlayout;
    QPushButton* button;
    int i = 0;
    void addBtn();

protected:
    void resizeEvent(QResizeEvent* e);

};

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow) {

    ui->setupUi(this);

    resize(300,300);

    window = new QWidget;
    frame = new QFrame(window);
    frame->setGeometry(0,0,50,300);
    scroll = new QScrollArea(window);
    scroll->setGeometry(50,0,250,300);
    scroll->setWidgetResizable(true);

    vlayout = new QVBoxLayout(scroll);
    vlayout->setMargin(0);
    vlayout->setSpacing(0);
    vlayout->addStretch();

    button = new QPushButton(window);
    button->setFixedSize(50,30);
    button->setText("add");

    connect(button, &QPushButton::clicked, this, &MainWindow::addBtn);

    setMinimumSize(100,100);
    setCentralWidget(window);
}

MainWindow::~MainWindow() {
    delete ui;
}

void MainWindow::addBtn() {
    QPushButton* btn = new QPushButton(scroll);
    btn->setText(QString::number(i));
    btn->setFixedHeight(30);
    ++i;

    vlayout->insertWidget(0, btn);
}

void MainWindow::resizeEvent(QResizeEvent *e) {
    window->resize(e->size());
    frame->setGeometry(0,0,50,e->size().height());
    scroll->setGeometry(50,0,e->size().width() - 50, e->size().height());

}

eyllanesc

@knyitra Change

vlayout = new QVBoxLayout(scroll);

to

QWidget *container = new QWidget;
scroll->setWidget(container);
vlayout = new QVBoxLayout(container);

knyitra

@eyllanesc

That is still not solve my problem. Evertyhing looks the same.