Qt-interest Archive, September 2002
Ordinal count in QListView
Message 1 in thread
Hello.
I'm looking for a convenient way to know the ordinal index of a
QListViewItem within a QListView.
For instance, when I click on the 3rd line, I know which QListViewItem has
been selected, but I want to know it's index.
This question as already been asked there, but the "asker" (Spell ?)
answered himself that the question was stupid.. ;)
I currently use a combination of 'QListView::itemPos()',
'QListViewItem::height()', and 'QListView::selectedItem()', but this looks
like a bad trick.
I presume that I can go through the QListViewItem collection with a
firstChild() and some nextSibling() to find out this, but something like an
:
"int QListView::itemIndex(QListViewItem *)" function is welcome.
(the same in the other way, to access directly to the xxth QListViewItem :
"QListViewItem * QListView::itemAtIndex(int)" function )
Does Anybody have any idea ?
---
Pierre-Nicolas RIGAL - pnr@4js.com
Four J's Development Tools - www.fourjs.com
Tel +33 (0)3 88 18 61 20 - Fax +33 (0)3 88 18 61 21
Message 2 in thread
Hi !
This function returns the y-coordinate of the item.
For instance, if the height of my QListViewItems is "16", the result of this
function will be ( 16 x ordinal_position).
I currently use this function like this:
QListView *myList;
QListViewItem *currentItem;
return myList->itemPos(currentItem) / currentItem->height();
which works (and returns 0 for first item as you said), but I was expected
something more elegant ;), for instance something similar as in Visual
Basic, with the:
list.item(position as integer)
and
list.selectedIndex() as integer
functions or something like that. I have some doubt about my solution
because of this doc's remark:
(itemPos)
"This function is normally much slower than itemAt() but it works for all
items, whereas itemAt() normally works only for items on the screen."
Thank you for your answer.
> -----Original Message-----
> From: Joe Butith [mailto:carsten@fieguth.de]
> Sent: jeudi 5 septembre 2002 19:15
> To: pnr@4js.com
> Subject: Re: Ordinal count in QListView
>
>
> Have a look at this:
>
> file:///C:/Programme/qt/3.0.5/doc/html/qlistview.html#itemPos
>
> itemPos ( listView->selectedItem() )
>
> Pay attention that the first item of the listView have the position 0, of
> course....
>
> Have luck,
>
>
> Joe
>
>
> At 18:30 05.09.02 +0200, you wrote:
> >Hello.
> >I'm looking for a convenient way to know the ordinal index of a
> >QListViewItem within a QListView.
> >
> >For instance, when I click on the 3rd line, I know which
> QListViewItem has
> >been selected, but I want to know it's index.
> >
> >This question as already been asked there, but the "asker" (Spell ?)
> >answered himself that the question was stupid.. ;)
> >
> >I currently use a combination of 'QListView::itemPos()',
> >'QListViewItem::height()', and 'QListView::selectedItem()', but
> this looks
> >like a bad trick.
> >
> >I presume that I can go through the QListViewItem collection with a
> >firstChild() and some nextSibling() to find out this, but
> something like an
> >:
> >"int QListView::itemIndex(QListViewItem *)" function is welcome.
> >
> >(the same in the other way, to access directly to the xxth
> QListViewItem :
> >"QListViewItem * QListView::itemAtIndex(int)" function )
> >
> >Does Anybody have any idea ?
> >
> >
> >---
> >Pierre-Nicolas RIGAL - pnr@4js.com
> >Four J's Development Tools - www.fourjs.com
> >Tel +33 (0)3 88 18 61 20 - Fax +33 (0)3 88 18 61 21
> >
> >--
> >List archive and information: http://lists.trolltech.com/qt-interest/
>
>
> ==============================
> schaut doch mal unter
> http://carsten.fieguth.de
> vorbei.
> Witziges, Privates, Fantasy und mehr....
Message 3 in thread
You could subclass QListViewItem:
class SelectionItem : public QListViewItem {
public:
SelectionItem(QListView *parent,QString label,int ID)
: QListViewItem(parent,label)
{ id = ID;}
SelectionItem(QListViewItem *parent,QString label,int ID)
: QListViewItem(parent,label)
{ id = ID;}
int getId()
{ return id;};
protected:
int id;
};
Then you'll need to cast the return value of functions that give you a
QListViewItem:
QListView *view;
SelectionItem *item = (SelectionItem*) view->firstChild();
int Id = item->getId();
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-----Original Message-----
From: Pierre-Nicolas RIGAL [mailto:pnr@4js.com]
Sent: Thursday, September 05, 2002 11:31 AM
To: Qt-Interest@Trolltech. Com
Subject: Ordinal count in QListView
Hello.
I'm looking for a convenient way to know the ordinal index of a
QListViewItem within a QListView.
For instance, when I click on the 3rd line, I know which QListViewItem has
been selected, but I want to know it's index.
This question as already been asked there, but the "asker" (Spell ?)
answered himself that the question was stupid.. ;)
I currently use a combination of 'QListView::itemPos()',
'QListViewItem::height()', and 'QListView::selectedItem()', but this looks
like a bad trick.
I presume that I can go through the QListViewItem collection with a
firstChild() and some nextSibling() to find out this, but something like an
:
"int QListView::itemIndex(QListViewItem *)" function is welcome.
(the same in the other way, to access directly to the xxth QListViewItem :
"QListViewItem * QListView::itemAtIndex(int)" function )
Does Anybody have any idea ?
---
Pierre-Nicolas RIGAL - pnr@4js.com
Four J's Development Tools - www.fourjs.com
Tel +33 (0)3 88 18 61 20 - Fax +33 (0)3 88 18 61 21
--
[ signature omitted ]
