Disable changing of shape of cursor when it inside of QTextEdit

Kaznachei

I have MainWindow, custom GraphicsView and QGraphicsScene. In QGraphicsScene added QGraphicsRectItem. In QGraphicsRectItem added QTextEdit (I want have oportunity to rotate QTextEdit). I want to disable changing of shape of cursor when it inside of QTextEdit. How can i do it?

mrjj

Hi
You mean, you dont want it to be editable ?

Kaznachei

For example, i clicked on QPushButton then QTextEdit doesn`t react to mouse events ( i dont want to use setEnabled, because it changes color to gray). I clicked on QPushButton then QTextEdit starts to react to mouse events.

mrjj

@Kaznachei
Hi
Ok. try
myTextEdit->setReadOnly(true);

Kaznachei

Yes, i did it already, but shape of cursor changes when My cursor in QTextEdit

mrjj

@Kaznachei
ah. now i get it,
it changes when you hover the mouse over it and you dont want that.
even with
setTextInteractionFlags(Qt::NoTextInteraction);
it still does that.

I have not seen a setting for it.
You should be able to install event filter on it and eat the EnterEvent
which should stop it from changing. However,
i have not tried it.

Kaznachei

What i should to override?

mrjj

@Kaznachei
Just saw something

docs says

The shape of the mouse cursor on a QTextEdit is Qt::IBeamCursor by default. It can be changed through the viewport()'s cursor property.

let me try it. 1 min

mrjj

Hi
Try
ui->textEdit->viewport()->setCursor(Qt::ArrowCursor);
works here :)

Kaznachei

But if will be use it when i want to QTextEdit doesnt react to events(sometimes) it would be worse to use setCursor? (Because it reacts, and it spend time and resources)

mrjj

@Kaznachei
setCursor is only called when you dont want the I beam cursor so should not be expensive.
An eventFilter would also cost CPU
so i think a ReadOnly TextEdit is as light as one with eventFilter.
However, why not try it out and see what you think ?

Kaznachei

It works, really thank you. Just i wanted to know which way is cheaper to solve my problem. As for me all that i saw was to too expensive. Is this way is ok? Just i wrote some SLOTS in my custom GraphicsRectItem
void lineChoosed()
{
text->viewport()->setCursor(Qt::ArrowCursor);
text->setReadOnly(true);
setAcceptHoverEvents(false);
setCursor(Qt::ArrowCursor);
}
void textChoosed()
{
text->viewport()->setCursor(Qt::IBeamCursor);
text->setReadOnly(false);
setAcceptHoverEvents(true);
}

and in my custom GraphicsView when i create a new one GraphicsRectITem

connect(this, &GraphicsView::lineChoosed, item, &RectItem::lineChoosed);
connect(this, &GraphicsView::textChoosed, item, &RectItem::textChoosed);

That means when i emit lineChoosed or textChoosed then are called my slots-functions as much as i have my custom GraphicsRectItem. Is it okay?

mrjj

@Kaznachei
Hi, yes that should be fine.
Should not be heavy.

Kaznachei

Thank you a lot. May i know how can i realize it using eventFilter? I tried
text->setObjectName("text');

and in GraphicsView::eventFilter(QObject* obj, QEvent *event)
{
if (obj->objectName() == "test") return false;
return QObject::eventFilter(obj, event);
}

(obj->objectName() == "test") works but shape of cursor still changing

mrjj

@Kaznachei
Hi
it's actually the viewport that does the most of it, so assign (installEventFilter) the eventFilter to
text->viewport() instead.
and check for viewports name instead. (or set it to test also)

Kaznachei

Like this ? I wrote it in GraphicsView
RectItem* item = new RectItem;
item->setObjectName("I");
item->setPos(event->pos() - QPoint(item->rect().width()/2, item->rect().height()/2));
item->text->viewport()->installEventFilter(this);

mrjj

@Kaznachei
yes, looks right.
"this" being GraphicsView with the eventFilter function, i assume.

Kaznachei

Oh, May i realize it? I want to my GraphicsView get events of my GraphicsItem. I want to my GraphicsView filters events of my GraphicsItem .

mrjj

@Kaznachei
Hi
The syntax is
monitoredObj->installEventFilter(filterObj);

monitoredObj = GraphicsItem

filterObj = GraphicsView
and this should have the
:eventFilter(QObject* obj, QEvent *event)
function.

Kaznachei

In GraphicsView
RectItem* item = new RectItem;
item->setObjectName("I");
item->setPos(event->pos() - QPoint(item->rect().width()/2, item->rect().height()/2));
item->installEventFilter(this);

and

bool eventFilter(QObject *obj, QEvent *event)
{
if (obj->objectName() == "I")
qDebug() << "ok"
return QGraphicsView::eventFilter(obj, event);
}

qDebug() doesn`t write.