Qt-interest Archive, March 2007
I must be missing something WRT mouse hover events
Message 1 in thread
I need to modify a group of graphics items when the mouse hovers over that
particular group. The items are grouped within myItemGroup, a subclass of
QGraphicsItemGroup. I have written code for the hover enter and leave
event handlers, but these never seem to get invoked.
I am obviously overlooking something, but I'm stumped and would appreciate
some help. Here is a code snippet to illustrate:
class myItemGroup : public QObject, public QGraphicsItemGroup
{
Q_OBJECT
...
protected:
void hoverEnterEvent(QGraphicsSceneHoverEvent* event);
void hoverLeaveEvent(QGraphicsSceneHoverEvent* event);
...
};
void myItemGroup:hoverEnterEvent(QGraphicsSceneHoverEvent* event)
{
printf("hoverEnterEvent called\n"); // This never gets printed!
}
void myItemGroup:hoverLeaveEvent(QGraphicsSceneHoverEvent* event)
{
printf("hoverLeaveEvent called\n"); // Neither does this.
}
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Message 2 in thread
On 25 mar 2007, at 18.59, Larry Bristol wrote:
> I need to modify a group of graphics items when the mouse hovers
> over that
> particular group. The items are grouped within myItemGroup, a
> subclass of
> QGraphicsItemGroup. I have written code for the hover enter and leave
> event handlers, but these never seem to get invoked.
>
> I am obviously overlooking something, but I'm stumped and would
> appreciate
> some help. Here is a code snippet to illustrate:
>
> class myItemGroup : public QObject, public QGraphicsItemGroup
> {
> Q_OBJECT
> ...
> protected:
> void hoverEnterEvent(QGraphicsSceneHoverEvent* event);
> void hoverLeaveEvent(QGraphicsSceneHoverEvent* event);
> ...
> };
>
> void myItemGroup:hoverEnterEvent(QGraphicsSceneHoverEvent* event)
> {
> printf("hoverEnterEvent called\n"); // This never gets printed!
> }
> void myItemGroup:hoverLeaveEvent(QGraphicsSceneHoverEvent* event)
> {
> printf("hoverLeaveEvent called\n"); // Neither does this.
> }
>
bool QGraphicsItem::acceptsHoverEvents () const
Returns true if an item accepts hover events
(QGraphicsSceneHoverEvent); otherwise, returns false. By default,
items do not accept hover events.
See also setAcceptsHoverEvents() and setAcceptedMouseButtons().
Have you enabled them?
------
What is a woman that you forsake her, and the hearth fire and the
home acre,
to go with the old grey Widow Maker. --Kipling, harp song of the
Dane women
Tommy Nordgren
tommy.nordgren@xxxxxxxxx
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Message 3 in thread
Tommy Nordgren wrote:
> bool QGraphicsItem::acceptsHoverEvents () const
> Returns true if an item accepts hover events
> (QGraphicsSceneHoverEvent); otherwise, returns false. By default,
> items do not accept hover events.
> See also setAcceptsHoverEvents() and setAcceptedMouseButtons().
> Have you enabled them?
Nope. That fixed it. Thanks, Tommy!
In QtAssistant, setAcceptMouseEvents has a reference to the event handlers
("see hoverEnterEvent, hoverMoveEvent, and hoverLeaveEvent"). It certainly
would be nice if the documentation for the event handlers happened to
mention "see setAcceptsHoverEvents". :-)
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Message 4 in thread
Hi,
> In QtAssistant, setAcceptMouseEvents has a reference to the event handlers
> ("see hoverEnterEvent, hoverMoveEvent, and hoverLeaveEvent"). It certainly
> would be nice if the documentation for the event handlers happened to
> mention "see setAcceptsHoverEvents". :-)
I think that's the case in current snapshots, but also in Qt 4.3.0beta:
http://doc.trolltech.com/4.3-snapshot/qgraphicsitem.html#hoverEnterEvent
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Message 5 in thread
Dimitri wrote:
> I think that's the case in current snapshots, but also in Qt 4.3.0beta:
> http://doc.trolltech.com/4.3-snapshot/qgraphicsitem.html#hoverEnterEvent
I should have pointed out I am using 4.2.1. Thanks, Dimitri! That snapshot
looks good! Hopefully, I won't *need* that doc change next time, but I
suppose I could experience one of those "senior moments". <grin>
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