Another thead about QScrollArea

[kalpa]

Hi.

Here is standard test code for QScrollArea and standard task is to scroll down.

And QScrollArea don't scroll down. Just to the last but one element.

I try to find what is the maximum value for ScrollArea->verticalScrollBar() and found that it is less than real.

Where I am wrong? Help please! And how to scroll down to new element.

int Step=0;
 
TestWidget::TestWidget():QWidget()
{
    QVBoxLayout *InterfaceLayout=new QVBoxLayout(this);
 
    ScrollArea=new QScrollArea(this);
    ScrollArea->setWidgetResizable(true);
    ScrollArea->verticalScrollBar()->setMaximum(100);
    InterfaceLayout->addWidget(ScrollArea);
    connect(ScrollArea->verticalScrollBar(), SIGNAL(sliderMoved(int)), this, SLOT(sliderMove(int)));
 
    ScrollWidget=new QWidget(this);
    ScrollWidgetLayout=new QVBoxLayout(ScrollWidget);
    ScrollWidgetLayout->setSpacing(0);
    ScrollWidgetLayout->setMargin(0);
    ScrollArea->setWidget(ScrollWidget);
 
 
    NewButton=new QPushButton("new", this);
    InterfaceLayout->addWidget(NewButton);
    connect(NewButton, SIGNAL(clicked()), this, SLOT(newWidget()));
 
    resize(200, 300);
}
 
void TestWidget::newWidget()
{
    Step++;
 
    QPushButton *nButton=new QPushButton(QString::number(Step), this);
    nButton->setMinimumHeight(50);
    ScrollWidgetLayout->addWidget(nButton);
    nButton->show();
 
    // ScrollArea->verticalScrollBar()->setValue(ScrollArea->verticalScrollBar()->maximum()+70);
 
    qDebug()<<"maximum scroll"<<ScrollArea->verticalScrollBar()->maximum();
 
    ScrollArea->ensureWidgetVisible(nButton);
}
 
void TestWidget::sliderMove(int)
{
    qDebug()<<"Real value is"<<ScrollArea->verticalScrollBar()->value();
 
}

int Step=0;

TestWidget::TestWidget():QWidget()
{
    QVBoxLayout *InterfaceLayout=new QVBoxLayout(this);

    ScrollArea=new QScrollArea(this);
    ScrollArea->setWidgetResizable(true);
    ScrollArea->verticalScrollBar()->setMaximum(100);
    InterfaceLayout->addWidget(ScrollArea);
    connect(ScrollArea->verticalScrollBar(), SIGNAL(sliderMoved(int)), this, SLOT(sliderMove(int)));

    ScrollWidget=new QWidget(this);
    ScrollWidgetLayout=new QVBoxLayout(ScrollWidget);
    ScrollWidgetLayout->setSpacing(0);
    ScrollWidgetLayout->setMargin(0);
    ScrollArea->setWidget(ScrollWidget);


    NewButton=new QPushButton("new", this);
    InterfaceLayout->addWidget(NewButton);
    connect(NewButton, SIGNAL(clicked()), this, SLOT(newWidget()));

    resize(200, 300);
}

void TestWidget::newWidget()
{
    Step++;

    QPushButton *nButton=new QPushButton(QString::number(Step), this);
    nButton->setMinimumHeight(50);
    ScrollWidgetLayout->addWidget(nButton);
    nButton->show();

    // ScrollArea->verticalScrollBar()->setValue(ScrollArea->verticalScrollBar()->maximum()+70);

    qDebug()<<"maximum scroll"<<ScrollArea->verticalScrollBar()->maximum();

    ScrollArea->ensureWidgetVisible(nButton);
}

void TestWidget::sliderMove(int)
{
    qDebug()<<"Real value is"<<ScrollArea->verticalScrollBar()->value();

}

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And QScrollArea don't scroll down. Just to the last but one element.
I try to find what is the maximum value for ScrollArea->verticalScrollBar() and found that it is less than real.

Where I am wrong? Help please! And how to scroll down to new element.

Thanks a lot