[Qt-interest] Signals emitted by QSceneView

[Christian Gagneraud]

On 11/29/2010 03:16 PM, Brian McKinnon wrote:
> I set the sceneRect and now the scroll bars don't come up, but I'm still

Perhaps the size of your view is bigger than the scene's size 
multiplied by the zoom factor. Hence no need for scrollbar.
Anyway you can force scrollbars to be always displayed:
http://doc.qt.nokia.com/4.7/qt.html#ScrollBarPolicy-enum
As QGraphicsView is derived from QAbstractScrollArea.

My 2 cents,
Chris


> not getting any leave event.  It looks like I may just need to initiate
> a drag event when I click on an item.  If that is the case I can
> probably still move the object around the scene using the drag event
> slots to move the item... but this seems sort of hacky.  Does anyone
> know if any signal is sent when a selected object is moved out of the
> scene or view?
>
> On Fri, Nov 26, 2010 at 12:57 PM, Sean Harmer
> <sean.harmer at maps-technology.com
> <mailto:sean.harmer at maps-technology.com>> wrote:
>
>     Hi,
>
>     On Friday 26 November 2010 16:49:14 Oliver.Knoll at comit.ch
>     <mailto:Oliver.Knoll at comit.ch> wrote:
>      > On 2010-11-26 Brian Brian McKinnon wrote:
>      > > ...  I've been trying to overload the leaveEvent,
>      > > mouseLeaveEvent, ... well pretty much any leave event in either the
>      > > view, scene, or item that I can find with no luck.  Is there a
>      > > notification that gets set out when a mouse leaves a view while
>     dragging
>      > > an item in the scene?
>      >
>      > I am just doing my first steps with QGraphicsScene/View, hence I
>     do not
>      > have much experience with that.
>      >
>      > In my case I observed that the QGraphicsScene "bounding box"
>     seems to be
>      > enlarged once I move an item out "into the invisible". I notice this
>      > because scrollbars appear and the scrollable area becomes bigger.
>      >
>      > I don't think QGraphicsView/Scene would emit a "mouse leave"
>     event while
>      > dragging, because enlarging the area seems to be the intended action.
>
>     Not sure if it helps here, but you can prevent that behaviour by
>     explicitly
>     setting a sceneRect on your scene.
>
>     Sean
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-- 
Christian Gagneraud,
Electronics and software engineer

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