Add custom object to QListWidget

[robzanab]

Thanks Mr stranz

yes..now i design the items using a relative position, and im able to introduce 2 line of text + design
what i want around them....It very intresting to design what i want.

The way i introduce text is the more general way, using model :

QListView  *ListW= new QListView(window);
 
                Customdelegate          *ItemDel=new Customdelegate(ListW);//connect delegate to view
                QStandardItemModel  *Mod= new QStandardItemModel();//connect model to view
 
 
                ListW->setItemDelegate(ItemDel);
                 ListW->setModel(Mod);
 
 
 
                //Create and  Add item1 to Mod
 
                QStandardItem *Item1= new QStandardItem();
 
                Item1->setData("ciao1",Qt::DisplayRole);
 
                Mod->appendRow(Item1);
 
 
                 //Create and  Add item2 to Mod
 
 
                QStandardItem *Item2= new QStandardItem();
 
                Item2->setData("ciao2",Qt::DisplayRole);
 
                Mod->appendRow(Item2);

QListView  *ListW= new QListView(window);
 
                Customdelegate          *ItemDel=new Customdelegate(ListW);//connect delegate to view
                QStandardItemModel  *Mod= new QStandardItemModel();//connect model to view


                ListW->setItemDelegate(ItemDel);
                 ListW->setModel(Mod);



                //Create and  Add item1 to Mod

                QStandardItem *Item1= new QStandardItem();

                Item1->setData("ciao1",Qt::DisplayRole);

                Mod->appendRow(Item1);


                 //Create and  Add item2 to Mod


                QStandardItem *Item2= new QStandardItem();

                Item2->setData("ciao2",Qt::DisplayRole);

                Mod->appendRow(Item2);

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and in the delegate paint(), i get them using index & role

QString headerText = qvariant_cast<QString>(index.data(Qt::DisplayRole));
          .....
          ......

QString headerText = qvariant_cast<QString>(index.data(Qt::DisplayRole));
          .....
          ......

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and all what i aspect is working.....2 label in 2 line + a big rectangle around....Beautiful.

My next question is:I want add button (for now to be simple, we dont speak about signal&slot)

My idea was to add buttons to -Mod-, create a custom- role-,and identify button in paint() via my role.
But i cant introduce any button in model.

Next idea is to design button in the paint(); but this means also that in future i need to connect signal&slot
at every paint..a lot of computation.

What is your suggestion ?

Thanks

Roberto

[d_stranz]

but this means also that in future i need to connect signal&slot at every paint..a lot of computation.

No, no, no, don't ever do that. Paint is for painting, nothing else.

And you do not want to put anything like a button in the *model*. The model is independent of any place it is displayed. That's the whole purpose of the Model-View architecture, to separate those two things.

In your delegate, you can use QStylePainter to draw the image of a pushbutton into the delegate's QRect (or part of it). You can also reimplement QAbstractItemDelegate::editorEvent() and watch for mouse events in the rect occupied by your pushbutton image. You could use those to simulate a click on your pushbutton, and emit a custom "clicked" signal that contains the model index (sent into editorEvent()) as a parameter. That lets you handle the signal in your own slot, and you'll have the index of the list widget element that triggered it.

[robzanab]

Thanks Mr Stranz....

editorEvent work good...If I press mouse on any text line i visualiza (2 line ),then i get the event and im able to understand what of the 2 i pressed.
In particolar, the first line is easy to click, the second line no so precise.


What I used for draw text is painter->drawtext(rect, text) , and rect is bad created...I have no control of it..

..This is part of code ,inside paint() event:

......
     QRect headerRect=option.rect ; //<--------
 
       headerRect.setLeft(40);
 
 
    headerRect.setTop(headerRect.top()+150);  
    headerRect.setBottom(headerRect.top()+130);  
 
   ....
  painter->drawText( headerRect ,headerText);

......
     QRect headerRect=option.rect ; //<--------

       headerRect.setLeft(40);

     
    headerRect.setTop(headerRect.top()+150);  
    headerRect.setBottom(headerRect.top()+130);  

   ....
  painter->drawText( headerRect ,headerText);

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I cant manage this headerrect....I want that next headerrect start +150 compared to previous, hight 130.
But i cant increase the distance bettwen 2 text....

So question are:

-why create a rectangle using option.rect().....Who is filling option object ?
-why distance dont work.

Slowly slowly all seems more clear...thanks
Roberto

[robzanab]

Hello

I dont get any reply.

Simplified question is:

-Why inside the paint event, we must create a rectangle using - option.rect -

Thanks

Roberto

Hello

I dont get any reply.

Simplified question is:

-Why inside the paint event, we must create a rectangle using - option.rect -

Thanks

Roberto