How to access QTextEdit "layout" to add "status bar"? - qt

Question

This a modified question I have posted on this forum.
It is not a repost, for two reasons - I cannot edit the other post and I am trying to
resolve this issue from another angle. Besides the other post got derailed by people who mean well but did not really read the post.
I have a working C++ code which is using (QT) QTextEdit class to collect and process text data.
The class - as its name suggest - was designed to collect and analyze text.
The text is displayed in "view " area.
My task is to select ONE word of text and drag it to another GUI object.
I like to put the text being dragged into QT standard "status bar".
Normal QT GUI widgets are designed using QTDesigner. Integral part of such design process
is "layout".
As it stands , QTextEdit DOES NOT HAVE / USE "layout" or use it but it is NOT visible / accessible when QTextEdit is implemented - there is no need for it.
In order to add "status bar" I need to MODIFY the view to hold the current text editing
"layout" and add "status bar " layout.
I am unable to figure out how to get access to the QTextEdit class GUI layout.
I am asking for help to accomplish that- how to add "status bar" to EXISTING QTextEdit.
Please read the post carefully _ I need help with how to add "status bar" to EXISTING QTextEdit.
I do have an option to replace the QTextEdit with basic "widget" class but it "breaks " the working code and I rather not do that.
I did look into setting multiple inheritance - Qwidget and QTextEdit but did not work.
PLEASE Mr Higgins , editing my post for proper English grammar and composition DOES NOT solve the problem. So , please - don't.

Answer 1

I'm not entirely sure but your question seems to imply that inheriting from QTextEdit would be acceptable. If that's the case then you can probably make use of the fact that QTextEdit itself inherits QAbstractScrollArea and use the viewport margins to create an area in which to show a status bar of some sort.
Consider the following code...
#include <QApplication>
#include <QScrollBar>
#include <QStatusBar>
#include <QTextEdit>
namespace {
class text_edit: public QTextEdit {
using super = QTextEdit;
public:
explicit text_edit (QWidget *parent = nullptr)
: super(parent)
, m_status(this)
{
m_status.setStyleSheet("background-color: gray;");
m_status.showMessage("Status text goes here...");
show_status(true);
horizontalScrollBar()->installEventFilter(this);
verticalScrollBar()->installEventFilter(this);
setLineWrapMode(QTextEdit::NoWrap);
}
protected:
virtual bool eventFilter (QObject *obj, QEvent *event) override
{
if (event->type() == QEvent::Show || event->type() == QEvent::Hide)
update_status_geometry();
return super::eventFilter(obj, event);
}
virtual void resizeEvent (QResizeEvent *event) override
{
super::resizeEvent(event);
update_status_geometry();
}
private:
void show_status (bool on)
{
if (on) {
setViewportMargins(0, 0, 0, m_status.height());
m_status.show();
} else {
setViewportMargins(0, 0, 0, 0);
m_status.hide();
}
}
void update_status_geometry ()
{
/*
* Calculate initial geometry of the QStatusBar based on its size hint.
*/
auto s = m_status.sizeHint();
s.rwidth() = width();
QRect geom(QPoint(0, 0), s);
geom.moveTop(height() - s.height());
/*
* Adjust the status bar geometry to allow for the scroll bars.
*/
if (horizontalScrollBar()->isVisible())
geom.moveTop(geom.top() - horizontalScrollBar()->height());
if (verticalScrollBar()->isVisible())
geom.setRight(geom.right() - verticalScrollBar()->width());
m_status.setGeometry(geom);
}
QStatusBar m_status;
};
}
int
main (int argc, char **argv)
{
QApplication app(argc, argv);
text_edit te;
te.show();
return app.exec();
}
Running the code above results in the following widget...