[Qt-interest] Tree Item view Highlighter

[Sajjad]

Hello

emitting the dataChanged() is done only when we re-implement the setData()
function. Should i over-ride data() or the setData() function?



Regards
Sajjad

On Tue, Jan 4, 2011 at 6:53 PM, Scott Aron Bloom
<Scott.Bloom at onshorecs.com>wrote:

> On Tue, Jan 4, 2011 at 10:21 AM, Andre Somers <andre at familiesomers.nl>
> wrote:
>
> Op Di, 4 januari, 2011 9:21 am, schreef Sajjad:
>
>
> >>  Is there anything missing up there? I removed the other function that i
> >> over-rid mentioned in the previous post.
> >>
> >>  I am still not getting any effect. The textchanged() signal is
> >> connected
> >> to  the slot as before.
> >>
> >> Ah, of course... Sorry about that.
> >>
> >> First of all: are you getting an effect if you set a fixed regexp to
> >> begin
> >> with? If not, then something is wrong in the code above. Set a
> >> breakpoint
> >> where you return the color and see if you ever arrive there at all...
> >>
> >
> > I set the breakpoint at the slot
> >
> >   void H3DNodeListWidget::highlightRegExpChanged()
> >
> > {
> >
> >     QRegExp
> >
> regExp(m_nodeHighlightingEditor->text(),Qt::CaseInsensitive,QRegExp::FixedString);
> >
> >      m_highlightModel->setFilterRegExp(regExp);
> >
> > }
> >
>
> I meant setting the breakpoint in the data() function.
>
>
>
> The breakpoint  has been set there as well.
>
>
> > And i did not reach  the data() function while stepping into the code.
>
> I can imagine it did not.
>
>
> >> However, I think the problem is, that you need to notify your view that
> >> the
> >> data has changed if your regexp changes. For testing, just emit reset(),
> >> but
> >> in your real implementation, you should probably be a bit nicer and emit
> >> dataChanged() with the right modelindexes.
> >>
>
> i believ ethat the dataChanged() signal two model indexes as input
> parameter. I need to highlight only one tree item that maches the expression
> in the line edit. In that case how should i set the value for the signal
> that takes 2 input parameters. Should it be the same source index specified
> twice? I tried something as follows:
>
>
>
>
> //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
>
>
>
> QVariant H3DHighlighterProxyModel::data(const QModelIndex &index, int role) const
>
> {
>
>     //get  the handle to  the underlyiing data
>
>     QModelIndex  sourceIndex = mapToSource(index);
>
>     if(!sourceIndex.isValid())
>
>     {
>
>         return QVariant();
>
>     }
>
>     if(role == Qt::BackgroundRole)
>
>     {
>
>         if(sourceModel()->data(sourceIndex).toString().contains(filterRegExp()))
>
>         {
>
>
>
>             //the following statement gives error because the virtual function itself
>
>
>
>             //declared const
>
>             emit dataChanged(sourceIndex,sourceIndex);
>
>             return Qt::cyan;
>
>         }
>
>         else
>
>         {
>
>             //return the default background color
>
>             //whatever may it be
>
>             return QVariant();
>
>         }
>
>     }
>
>     else
>
>     {
>
>         return sourceIndex.data(role);
>
>     }
>
> }
>
>
>
>
> ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
>
>
>
>
>
> And then if i have to set the connection as follows, i believe that it will
> not be valid:
>
>
>
>
> connect(m_proxyMode,dataChanged(QModelIndex,QModelIndex),m_treeView,SLOT(update(QModelIndex))));
>
>
>
> As you can see that the parameters are not matching.
>
>
>
> From all  the discussions you can imagine that i am having trouble to grasp
> the basic idea of model.view programming.
>
> Could you provide some references where these issues are well discussed?
>
>
>
>
>
> Regards
>
> Sajjad
>
> -----------------------
>
>
>
>
>
> Yes, read the Qt documentation on model view programming…  and the
> signal/slot programming…
>
>
>
> The dataChanged signal, allows you to send out a “square” of topLeft to
> bottomRight inclusive…  If topLeft == bottomRight, then only that cell is
> updated.
>
>
>
> As to your update connection, you shouldn’t have to, all views are
> automatically connected to the dataChanged signal
>
>
>
> Scott
>
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