Disable changing of shape of cursor when it inside of QTextEdit

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.

mrjj

@Kaznachei
Hi
try with

bool eventFilter(QObject *obj, QEvent *event)
{

qDebug() << obj->objectName();

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

and see what is going on

Kaznachei

qDebug write only this

""
""
""
""
""
""
""
""
""
""
""
""
""
""
""
""
""
""
""
""
""
""
""
""
""

mrjj

@Kaznachei
Hmm. odd.
Try
qDebug() << obj->metaObject()->className()
and see what type it is.

Else use the debugger to see what obj is.

Kaznachei

only
QScrollBar
QScrollBar
QScrollBar
QScrollBar
QScrollBar
QScrollBar

mrjj

Hi
Maybe eventFilters do not work on QGraphicsItems
I have never tested it but since they are not qobjects, i think its a no go.

Kaznachei

Yes. I read that QGraphicsObject has eventFilter, but not QGraphicsItem. Thank you a lot for ur helping.

mrjj

@Kaznachei
yes QGraphicsObject also inherits from QObject so that makes good sense it can use event filters too.
You are most welcome.