QChartView margins

Bert59

Hi,

I have a tabWidget with 2 tabs. In each tab I have added a vertical layout.
I add programatically a QChartView in each layout.
Here is the code for one tab

m_cartView = new (QChartView);
m_cartGraph = new (QChart);
ui->layoutCart->addWidget(m_cartView);
m_cartView->setChart(m_cartGraph);

For testing I have added the following lines to show what is related to the QChartView and what is related to the QChart.

m_cartGraph->setBackgroundBrush(Qt::yellow);
m_cartView->setBackgroundBrush(Qt::red);

I get the following result

My question is, can I make the QChart occupy the complete QChartView? I don't need these margings.

Thanks

mrjj

Hi
Make sure
layoutCart
has setContentsMargins(0,0,0,0);

Bert59

Hi,
Thank you for your suggestion. Unfortunately it has no effect.
I also tried
m_cartGraph->setContentsMargins(0, 0, 0, 0);
and
m_cartView->setContentsMargins(0, 0, 0, 0);

Then I tried the opposite to see if I can increase the margins.

With ui->layoutCart->setContentsMargins(20, 20, 20, 20); Iget

With m_cartView->setContentsMargins(20, 20, 20, 20);

With m_cartGraph->setContentsMargins(20, 20, 20, 20);

I also tried
m_cartGraph->setContentsMargins(-11, -11, -11, -11); which gives the following

I think this is not the correct way to do it.

mrjj

Ok so the margins is really from m_cartView.

Try do
m_cartView->dumpObjectTree();

and see if it has an internal layout we could try fiddling with.

Bert59

Here is what I get

QtCharts::QChartView::
QWidget::qt_scrollarea_hcontainer
QScrollBar::
QBoxLayout::
QWidget::qt_scrollarea_vcontainer
QScrollBar::
QBoxLayout::
QWidget::
QGraphicsScene::
QGraphicsSceneBspTreeIndex::

mrjj

Hi
Super.
So its a QScrollArea.
I tried to do

auto list = chartView->findChildren<QBoxLayout *>();
    for (QBoxLayout *lay : list) {
        lay->setContentsMargins(0, 0, 0, 0);
    }

but it had no effect.
So I don't know how to get rid of that border.

Bert59

Thank for your time looking into this issue.

For the time being to get rid of this border I have set Bakcground color of the QChartView to the same color as the background of the QChart.