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Qt-interest Archive, June 2007
In need of building block for replacement of QTreeView

Message 1 in thread

Hi

I've figured that QTreeView is not sufficient for my purposes, so I
need a view ;)

If anybody has a custom implementation of QAbstractItemView which
functions on the lines of QTreeView, then I could try to extend it, it
will save precious time.

Thanks

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Message 2 in thread

It might help if you described what functionality QTreeView doesn't do
for you....

> -----Original Message-----
> From: Mr.YogeshM [mailto:mr.yogeshm@xxxxxxxxx]
> Sent: Tuesday, June 19, 2007 8:11 AM
> To: qt-interest@xxxxxxxxxxxxx
> Subject: In need of building block for replacement of QTreeView
> 
> Hi
> 
> I've figured that QTreeView is not sufficient for my purposes, so I
> need a view ;)
> 
> If anybody has a custom implementation of QAbstractItemView which
> functions on the lines of QTreeView, then I could try to extend it, it
> will save precious time.
> 
> Thanks
> 
> --
> Yogesh M
> Chandigarh, India
> http://mr-yogi.blogspot.com/
> 
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
> "unsubscribe" in the subject or the body.
> List archive and information: http://lists.trolltech.com/qt-interest/

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Message 3 in thread

On 6/19/07, Scott Aron Bloom <scott@xxxxxxxxxxxx> wrote:
> It might help if you described what functionality QTreeView doesn't do
> for you....
>
> > -----Original Message-----
> > From: Mr.YogeshM [mailto:mr.yogeshm@xxxxxxxxx]
> > Sent: Tuesday, June 19, 2007 8:11 AM
> > To: qt-interest@xxxxxxxxxxxxx
> > Subject: In need of building block for replacement of QTreeView
> >
> > Hi
> >
> > I've figured that QTreeView is not sufficient for my purposes, so I
> > need a view ;)
> >
> > If anybody has a custom implementation of QAbstractItemView which
> > functions on the lines of QTreeView, then I could try to extend it, it
> > will save precious time.
>

Above all, I need that the decoration of tree be always drawn at the
first visible row.

Thanks
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Message 4 in thread

"Mr.YogeshM" <mr.yogeshm@xxxxxxxxx> wrote on 06/19/2007 09:58:48 AM:

# Above all, I need that the decoration of tree be always drawn at the
# first visible row.

Could you not simply inherit from and override the existing QTreeView
class?

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Message 5 in thread

On 6/19/07, Gordon.Schumacher@xxxxxxxxxxx <Gordon.Schumacher@xxxxxxxxxxx> wrote:
> "Mr.YogeshM" <mr.yogeshm@xxxxxxxxx> wrote on 06/19/2007 09:58:48 AM:
>
> # Above all, I need that the decoration of tree be always drawn at the
> # first visible row.
>
> Could you not simply inherit from and override the existing QTreeView
> class?
>
>

I have already tried it, but it seems that QTreeView, in its current
form, cannot be extended to achieve this.

Regards
-- 
 [ signature omitted ]
Message 6 in thread

>> # Above all, I need that the decoration of tree be always drawn at the
>> # first visible row.
>>
>> Could you not simply inherit from and override the existing QTreeView
>> class?
>>
>>
> 
> I have already tried it, but it seems that QTreeView, in its current
> form, cannot be extended to achieve this.

I did something similar in Qt 4.1; it boiled down to reimplement 
drawPrimitive() to call a custom drawIndicatorBranch() in QWindowsStyle 
(or whatever style(s) you're using). In drawIndicatorBranch() you can 
then use the copy/pasted code from the original drawPrimitve() to render 
the tree decorators, and tweak it according to your needs. The extended 
style then gets assigned to your treeview (or perhaps the whole 
application right from the start).

--8><--

void QWindowsStyleExt::drawPrimitive(PrimitiveElement elem, const 
QStyleOption* option,
	QPainter* painter, const QWidget* widget) const
{
	//Draw treeview branches
	if(elem == PE_IndicatorBranch)
	{
		drawIndicatorBranch(elem, option, painter, widget);
	}
	//All other primitves use the original implementation
	else
	{
		QWindowsStyle::drawPrimitive(elem, option, painter, widget);
	}
}

--><8--

HTH, Martin


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Message 7 in thread

> 
> Above all, I need that the decoration of tree be always drawn at the
> first visible row.
> 

Actually... this can be done with QTreeView... Look into the Style
system, as well as the Decoration Role for the model

Scott

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Message 8 in thread

On 6/19/07, Scott Aron Bloom <scott@xxxxxxxxxxxx> wrote:
> >
> > Above all, I need that the decoration of tree be always drawn at the
> > first visible row.
> >
>
> Actually... this can be done with QTreeView... Look into the Style
> system, as well as the Decoration Role for the model
>
> Scott
>
I stressed on "decoration of tree", please see the attached image for
description.
Regards
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Attachment: decoration.png
Description: PNG image

Message 9 in thread

> > Actually... this can be done with QTreeView... Look into the Style
> > system, as well as the Decoration Role for the model
> >
> > Scott
> >
> I stressed on "decoration of tree", please see the attached image for
> description.
> Regards

And I stressed it "can be done" with QTreeView... Nothing you showed
could not be done... It's a combination of a QStyle + Model Roles... 

The + symbol, the "tree line", and the text of the treeview are ALL
modifiable.

Scott

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