How to dynamically resize a QDeclarativeView Rectangle to my QWidget size ?

I'm showing content of my application that loads file and show the names, values, etc.
I'm trying to learn and use qml, I was using QWebView.

I'm resizing the widget elements manually with a line that lets you "move" it resizing a TreeWidget (in the left side) and the "View" (in the right side):

Code:

---

void MapBrowser::redoLayout(const QSize& twsize, const QSize& wvsize)
{
    static int padleft = ui->treeWidget->x();
    static int padmid = ui->line->x() - ui->treeWidget->x() - ui->treeWidget->width();
 
    if (this->size() == this->minimumSize()) return;
 
    if (twsize.width() < ui->treeWidget->minimumSize().width()) return;
    if (wvsize.width() < ui->declarativeView->minimumSize().width()) return;
    //if (wvsize.width() < ui->webView->minimumSize().width()) return;
 
    ui->treeWidget->resize(twsize);
    ui->declarativeView->resize(wvsize);
    //ui->webView->resize(wvsize);
 
    QPoint twmove(padleft, ui->treeWidget->y());
    QPoint lnmove(ui->treeWidget->x() + ui->treeWidget->width() + padmid, ui->line->y());
    QPoint wvmove(ui->line->x() + ui->line->width() + padmid, ui->declarativeView->y());
    //QPoint wvmove(ui->line->x() + ui->line->width() + padmid, ui->webView->y());
 
    ui->treeWidget->move(twmove);
    ui->line->move(lnmove);
    ui->declarativeView->move(wvmove);
    //ui->webView->move(wvmove);
}

---

But, my problem is:
I need to update the size of the main Rectangle, how can I do this ?

You scale the root object of the declarative view.

I've temporally switched back to QWebView. Because I want the labels to act like a normal "<span>".
But they aren't selectable and i'm not finding a way to copy and other things.
Is that possible make a "page" in QML like a html right ?

If it's possible what would be better ? Creating a html and changing some content with .arg() or javascript.
Or using QML <=> C++ ?