Home » Eclipse Projects » GEF » GEF auto-scroll when dragging an EditPart
| GEF auto-scroll when dragging an EditPart [message #241113] |
Tue, 29 January 2008 14:55  |
Eclipse User |
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Originally posted by: cfondacci.free.fr
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Hello all,
I am lost with the GEF behaviour when dragging an EditPart within one of my
diagram editor.
Here is my problem :
- Everything is perfect when I drag / move my editparts within the visible
client rectangle of my editor.
- When I try to drag an EditPart further than the visible area, I would
expect the visible area to scroll so that I could see where to drag my
Part... When I try to do this, the visible area scrolls the wrong way! That
means if I try to drag a part left beyond my control's visible area, the
control scrolls to the right.
Worse, if I drop the editpart when the (wrong way) scroll has started, it
starts a neverending loop where I can see my scroll bar scrolling to the
right till the infinite. When I pause my JVM to see what's going on, it
seems like the there are thousands of invalid figures. Somewhere in the
execution stack I can see that the problem might come from
ResizeHandle.revalidate() method...but not sure.
I don't know if i am doing something wrong (in my edit policy ?), if there
is something to declare, if there is a workaround...well i'm lost.
If you have any idea of why I got this unexpected behaviour, your help would
be very much appreciated...
Thank you.
Christophe.
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------=_NextPart_000_000C_01C8628F.54970D50--
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| Re: GEF auto-scroll when dragging an EditPart [message #241140 is a reply to message #241113] |
Wed, 30 January 2008 16:22  |
 Neeraj Bhusare
Messages: 177
Registered: July 2009
Location: Canada |
Senior Member |
|
|
Hello Christophe,
If things are working fine when a object is dropped in the
visible editor area, the it should_work_fine if the same object is
moved/dropped to the non-visible editor area. With the information you
provided, its hard to pin point the actual problem area - a detail stack
trace may help. I do have some pointers that may help you.
1. Since the layout policy (installed on the container) is involved in the
movement of child editParts, you need to make sure that it is written
correctly.
2. Check the serialized form of your model, if you find something wrong,
the command needs to be corrected.
3. Since you can see multiple invalid figures drawn, you need to check the
createFigure() method in the EditPart of the dropped figure. Generally
while dealing with complex figures we tend to make mistakes.
Hope this helps.
Christophe Fondacci wrote:
> Hello all,
> I am lost with the GEF behaviour when dragging an EditPart within one of my
> diagram editor.
> Here is my problem :
> - Everything is perfect when I drag / move my editparts within the visible
> client rectangle of my editor.
> - When I try to drag an EditPart further than the visible area, I would
> expect the visible area to scroll so that I could see where to drag my
> Part... When I try to do this, the visible area scrolls the wrong way! That
> means if I try to drag a part left beyond my control's visible area, the
> control scrolls to the right.
> Worse, if I drop the editpart when the (wrong way) scroll has started, it
> starts a neverending loop where I can see my scroll bar scrolling to the
> right till the infinite. When I pause my JVM to see what's going on, it
> seems like the there are thousands of invalid figures. Somewhere in the
> execution stack I can see that the problem might come from
> ResizeHandle.revalidate() method...but not sure.
> I don't know if i am doing something wrong (in my edit policy ?), if there
> is something to declare, if there is a workaround...well i'm lost.
> If you have any idea of why I got this unexpected behaviour, your help would
> be very much appreciated...
> Thank you.
> Christophe.
Twitter : @NeerajBhusare
Blog : https://nbhusare.github.io/
Best regards, Neeraj
|
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|
| Re: GEF auto-scroll when dragging an EditPart [message #241145 is a reply to message #241140] |
Thu, 31 January 2008 08:16 |
| Eclipse User |
|
|
|
Originally posted by: cfondacci.free.fr
Thank you for your answer,
Actually it happens only when I drag the edit part to a location point with
a negative X or negative Y. Other drags are all OK. So I think that my
figures are OK, and think that if I can make GEF prevent from dragging to
those positions it will solve my problem.
I tried to prevent GEF from dragging to these positions, but haven't
succeeded: I cannot find a way to constraint the "shadow" rectangle position
of my editpart (the rectangle which appears while dragging).
I think there might be a way in the edit policy. I tried to override
getConstraintFor(ChangeBoundsRequest, GraphicalEditPart) but it seems to
only constrain the size...
Thank you for your wise pieces of advice
Christophe.
"Neeraj" <neerajbhusare@gmail.com> a écrit dans le message de
news:e62e8d64bbbeeda41f297459707f4ce0$1@www.eclipse.org...
> Hello Christophe,
> If things are working fine when a object is dropped in the
> visible editor area, the it should_work_fine if the same object is
> moved/dropped to the non-visible editor area. With the information you
> provided, its hard to pin point the actual problem area - a detail stack
> trace may help. I do have some pointers that may help you.
> 1. Since the layout policy (installed on the container) is involved in the
> movement of child editParts, you need to make sure that it is written
> correctly. 2. Check the serialized form of your model, if you find
> something wrong, the command needs to be corrected.
> 3. Since you can see multiple invalid figures drawn, you need to check the
> createFigure() method in the EditPart of the dropped figure. Generally
> while dealing with complex figures we tend to make mistakes.
>
> Hope this helps.
>
> Christophe Fondacci wrote:
>
>> Hello all,
>
>> I am lost with the GEF behaviour when dragging an EditPart within one of
>> my diagram editor.
>
>> Here is my problem :
>> - Everything is perfect when I drag / move my editparts within the
>> visible client rectangle of my editor.
>> - When I try to drag an EditPart further than the visible area, I would
>> expect the visible area to scroll so that I could see where to drag my
>> Part... When I try to do this, the visible area scrolls the wrong way!
>> That means if I try to drag a part left beyond my control's visible area,
>> the control scrolls to the right.
>
>> Worse, if I drop the editpart when the (wrong way) scroll has started, it
>> starts a neverending loop where I can see my scroll bar scrolling to the
>> right till the infinite. When I pause my JVM to see what's going on, it
>> seems like the there are thousands of invalid figures. Somewhere in the
>> execution stack I can see that the problem might come from
>> ResizeHandle.revalidate() method...but not sure.
>
>> I don't know if i am doing something wrong (in my edit policy ?), if
>> there is something to declare, if there is a workaround...well i'm lost.
>
>> If you have any idea of why I got this unexpected behaviour, your help
>> would be very much appreciated...
>> Thank you.
>> Christophe.
>
>
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| Re: GEF auto-scroll when dragging an EditPart [message #241200 is a reply to message #241145] |
Sat, 02 February 2008 16:09 |
| Eclipse User |
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Originally posted by: gxquarel.txin.it
I have the same problem...
Something new?
Ciao
Giovanni
"Christophe Fondacci" <cfondacci@free.fr> ha scritto nel messaggio
news:fns052$u0u$1@build.eclipse.org...
> Thank you for your answer,
>
> Actually it happens only when I drag the edit part to a location point
> with a negative X or negative Y. Other drags are all OK. So I think that
> my figures are OK, and think that if I can make GEF prevent from dragging
> to those positions it will solve my problem.
>
> I tried to prevent GEF from dragging to these positions, but haven't
> succeeded: I cannot find a way to constraint the "shadow" rectangle
> position of my editpart (the rectangle which appears while dragging).
>
> I think there might be a way in the edit policy. I tried to override
> getConstraintFor(ChangeBoundsRequest, GraphicalEditPart) but it seems to
> only constrain the size...
>
> Thank you for your wise pieces of advice
> Christophe.
>
>
> "Neeraj" <neerajbhusare@gmail.com> a
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| Re: GEF auto-scroll when dragging an EditPart [message #241220 is a reply to message #241200] |
Mon, 04 February 2008 11:09 |
| Eclipse User |
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Originally posted by: cfondacci.free.fr
Nop...still haven't fix this problem.
Can someone help us with this negative X/Y problem (see description below) ?
Thank you.
Christophe.
"Giovanni" <gxquarel@txin.it> a écrit dans le message de
news:fo24k8$c2a$1@build.eclipse.org...
>I have the same problem...
> Something new?
>
> Ciao
>
> Giovanni
>
>
> "Christophe Fondacci" <cfondacci@free.fr> ha scritto nel messaggio
> news:fns052$u0u$1@build.eclipse.org...
>> Thank you for your answer,
>>
>> Actually it happens only when I drag the edit part to a location point
>> with a negative X or negative Y. Other drags are all OK. So I think that
>> my figures are OK, and think that if I can make GEF prevent from dragging
>> to those positions it will solve my problem.
>>
>> I tried to prevent GEF from dragging to these positions, but haven't
>> succeeded: I cannot find a way to constraint the "shadow" rectangle
>> position of my editpart (the rectangle which appears while dragging).
>>
>> I think there might be a way in the edit policy. I tried to override
>> getConstraintFor(ChangeBoundsRequest, GraphicalEditPart) but it seems to
>> only constrain the size...
>>
>> Thank you for your wise pieces of advice
>> Christophe.
>>
>>
>> "Neeraj" <neerajbhusare@gmail.com> a écrit dans le message de
>> news:e62e8d64bbbeeda41f297459707f4ce0$1@www.eclipse.org...
>>> Hello Christophe,
>>> If things are working fine when a object is dropped in the
>>> visible editor area, the it should_work_fine if the same object is
>>> moved/dropped to the non-visible editor area. With the information you
>>> provided, its hard to pin point the actual problem area - a detail stack
>>> trace may help. I do have some pointers that may help you.
>>> 1. Since the layout policy (installed on the container) is involved in
>>> the movement of child editParts, you need to make sure that it is
>>> written correctly. 2. Check the serialized form of your model, if you
>>> find something wrong, the command needs to be corrected.
>>> 3. Since you can see multiple invalid figures drawn, you need to check
>>> the createFigure() method in the EditPart of the dropped figure.
>>> Generally while dealing with complex figures we tend to make mistakes.
>>>
>>> Hope this helps.
>>>
>>> Christophe Fondacci wrote:
>>>
>>>> Hello all,
>>>
>>>> I am lost with the GEF behaviour when dragging an EditPart within one
>>>> of my diagram editor.
>>>
>>>> Here is my problem :
>>>> - Everything is perfect when I drag / move my editparts within the
>>>> visible client rectangle of my editor.
>>>> - When I try to drag an EditPart further than the visible area, I would
>>>> expect the visible area to scroll so that I could see where to drag my
>>>> Part... When I try to do this, the visible area scrolls the wrong way!
>>>> That means if I try to drag a part left beyond my control's visible
>>>> area, the control scrolls to the right.
>>>
>>>> Worse, if I drop the editpart when the (wrong way) scroll has started,
>>>> it starts a neverending loop where I can see my scroll bar scrolling to
>>>> the right till the infinite. When I pause my JVM to see what's going
>>>> on, it seems like the there are thousands of invalid figures. Somewhere
>>>> in the execution stack I can see that the problem might come from
>>>> ResizeHandle.revalidate() method...but not sure.
>>>
>>>> I don't know if i am doing something wrong (in my edit policy ?), if
>>>> there is something to declare, if there is a workaround...well i'm
>>>> lost.
>>>
>>>> If you have any idea of why I got this unexpected behaviour, your help
>>>> would be very much appreciated...
>>>> Thank you.
>>>> Christophe.
>>>
>>>
>>
>
>
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| Re: GEF auto-scroll when dragging an EditPart [message #241230 is a reply to message #241220] |
Mon, 04 February 2008 13:54 |
| Eclipse User |
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Originally posted by: juergen.scheffler.gmx.de
Only read parts of this "thread".
Could the freeformlayout be a solution?
When u read the beginner articles, they say that there are 2 important
layouts: one with -x and -y allowed and the other with "not allowed"
ELSE: just luck at the code of the samples. Maybe in the editor code...
Sry, I I talk absolute nonsense (I am new to GEF)
LG
JS
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