react on the resizing of a QMainWindow for adjust widget's size

Question

How do I react on the resize of a QMainWindow? I have QTextBrowsers in a QScrollArea and I adjust them to the size of the content on creating them (the only thing that should scroll is the QScrollArea).

Everything works for now, but if I resize the mainWindow, the height of the QTextBrowsers isn't changed, because the reflow function isn't triggered.

Do you have any better idea to adjust a QTextBrowser to it's content? My current code is:

void RenderFrame::adjustTextBrowser(QTextBrowser* e) const {
    e->document()->setTextWidth(e->parentWidget()->width());
    e->setMinimumHeight(e->document()->size().toSize().height());
    e->setMaximumHeight(e->minimumHeight());
}

The parentWidget() is necessary because running width() on the widget itself returns always 100, regardless of the real size.

The standard way to have your widgets resize is to put them in an appropriately configured layout. — Arnold Spence, Sep 04 '11 at 21:08
But there's no way to make `QtextBrowser` automatically resize to the smallest possible size that doesn't need a scrollbar — Florian, Sep 04 '11 at 22:11

alexisdm · Accepted Answer · 2011-09-05T18:59:24.327

If there is only text or html, you could use QLabel instead, because it already adapts its size to the available space. You'll have to use:

label->setWordWrap(true);        
label->setTextInteractionFlags(Qt::TextBrowserInteraction);

to have almost the same behavior as a QTextBrowser.

If you really want to use a QTextBrowser, you can try something like this (adapted from QLabel source code):

class TextBrowser : public QTextBrowser {
    Q_OBJECT
public:
    explicit TextBrowser(QWidget *parent) : QTextBrowser(parent) {
        // updateGeometry should be called whenever the size changes
        // and the size changes when the document changes        
        connect(this, SIGNAL(textChanged()), SLOT(onTextChanged()));

        QSizePolicy policy = sizePolicy();
        // Obvious enough ? 
        policy.setHeightForWidth(true);
        setSizePolicy(policy);
    }

    int heightForWidth(int width) const {
        int left, top, right, bottom;
        getContentsMargins(&left, &top, &right, &bottom);
        QSize margins(left + right, top + bottom);

        // As working on the real document seems to cause infinite recursion,
        // we create a clone to calculate the width
        QScopedPointer<QTextDocument> tempDoc(document()->clone());
        tempDoc->setTextWidth(width - margins.width());

        return qMax(tempDoc->size().toSize().height() + margins.height(),
                    minimumHeight());
    }
private slots:
    void onTextChanged() {
        updateGeometry();
    }
};

react on the resizing of a QMainWindow for adjust widget's size

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