Is it possible to put footer in the same line of legend?

[freshairfly]

Hi All,

I need add a label under the plot, and the footer seems what I need.
But I don't want the label occupy an extra line. That is I hope put the lable in the same line of legend. and the legend should be right alignment. Just like this:
Untitled.png

Any advice/hint is appreciated.

[Uwe]

Unfortunately I don't see an easy solution out of the box.

• You could manually add a QLabel with your footer text and align it manually according to resize events of the legend. When using QwtPlotRenderer you have to add some code for your footer too.
• Another option might be to overload QwtPlotLayout::activate() and manipulate the rects for footer and legend.
• You could also derive from QwtLegend and try to add your footer there

Uwe

[freshairfly]

Uwe,

I'd done it by your advice#3. And it works as expected exactly.
Thank you very much.

TrendPlotLegend::TrendPlotLegend(QWidget* parent)
    : QwtLegend(parent)
{
    contentsWidget()->layout()->setAlignment(Qt::AlignRight | Qt::AlignTop);
 
    QHBoxLayout* hbLayout = new QHBoxLayout(this);
    hbLayout->setContentsMargins(10, 0, 5, 0);
    hbLayout->setSpacing(0);
 
    m_footer = new QLabel(this);
    hbLayout->addWidget(m_footer, 0, Qt::AlignTop);
 
    // the old layout is a QVBoxLayout/ replace it with QHBoxLayout
    QLayout* oldLayout = layout();
    for (int i = 0; i < oldLayout->count(); ++i) {
        hbLayout->addItem(oldLayout->takeAt(i));
    }
    delete oldLayout;
    setLayout(hbLayout);
}
 
QSize TrendPlotLegend::sizeHint() const
{
    QSize size = QwtLegend::sizeHint();
 
    int width = size.width() + m_footer->sizeHint().width();
    size.setWidth(qMax(parentWidget()->width(), width));
    return size;
}

TrendPlotLegend::TrendPlotLegend(QWidget* parent)
    : QwtLegend(parent)
{
    contentsWidget()->layout()->setAlignment(Qt::AlignRight | Qt::AlignTop);

    QHBoxLayout* hbLayout = new QHBoxLayout(this);
    hbLayout->setContentsMargins(10, 0, 5, 0);
    hbLayout->setSpacing(0);

    m_footer = new QLabel(this);
    hbLayout->addWidget(m_footer, 0, Qt::AlignTop);

    // the old layout is a QVBoxLayout/ replace it with QHBoxLayout
    QLayout* oldLayout = layout();
    for (int i = 0; i < oldLayout->count(); ++i) {
        hbLayout->addItem(oldLayout->takeAt(i));
    }
    delete oldLayout;
    setLayout(hbLayout);
}

QSize TrendPlotLegend::sizeHint() const
{
    QSize size = QwtLegend::sizeHint();

    int width = size.width() + m_footer->sizeHint().width();
    size.setWidth(qMax(parentWidget()->width(), width));
    return size;
}

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[Uwe]

To make it complete you would also have to overload QwtLegend::renderLegend adding some code for your footer. Otherwise your footer will be missing, when using QwtPlotRenderer ( f.e. for generating pdf documents ).

Uwe