Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. Insert fill circle into cell of QTableWidget
Forum Updated to NodeBB v4.3 + New Features

Insert fill circle into cell of QTableWidget

Scheduled Pinned Locked Moved Solved General and Desktop
88 Posts 5 Posters 47.6k Views 2 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #72

    As I already suggested many times: use custom roles. So in your paint function, request the data using the roles specific to the parameters you want to get.

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

    J 1 Reply Last reply
    0
    • SGaistS SGaist

      As I already suggested many times: use custom roles. So in your paint function, request the data using the roles specific to the parameters you want to get.

      J Offline
      J Offline
      juaniyoalm
      wrote on last edited by
      #73

      @SGaist

      Yes, but I unknown how to do it...

      1 Reply Last reply
      0
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #74
        QVariant data = model->data(MyModel::MyCustomRole);
        

        In your model:

        QVariant MyModelModel::data(const QModelIndex &index, int role = Qt::DisplayRole) const
        {
        // usual stuff
        if (role == MyModel::MyCustomRole) {
            return mound->getCell(index.row(), index.column())->myCoolProperty;
        }
        }
        

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        J 1 Reply Last reply
        2
        • SGaistS SGaist
          QVariant data = model->data(MyModel::MyCustomRole);
          

          In your model:

          QVariant MyModelModel::data(const QModelIndex &index, int role = Qt::DisplayRole) const
          {
          // usual stuff
          if (role == MyModel::MyCustomRole) {
              return mound->getCell(index.row(), index.column())->myCoolProperty;
          }
          }
          
          J Offline
          J Offline
          juaniyoalm
          wrote on last edited by juaniyoalm
          #75

          @SGaist

          But I need both values to be at the same time in the delegate's paint method.

          I modify the value of the items of the cells in internal methods of the World class, not from model, then emit signal that is received by the slot located in the MainWindows class and this emit dataChange signal of the model, as I wrote before.

          mrjjM 1 Reply Last reply
          0
          • J juaniyoalm

            @SGaist

            But I need both values to be at the same time in the delegate's paint method.

            I modify the value of the items of the cells in internal methods of the World class, not from model, then emit signal that is received by the slot located in the MainWindows class and this emit dataChange signal of the model, as I wrote before.

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #76

            @juaniyoalm
            Hi
            Can we talk about the actual data ?
            What is the data for the circle ?
            you say "value of the circle"
            can u specify what that means ?
            The delegate has access to the cell so it can have any values at the same time.
            So to avoid confusing, could you tell what data you need to paint the circle ?

            J 1 Reply Last reply
            0
            • mrjjM mrjj

              @juaniyoalm
              Hi
              Can we talk about the actual data ?
              What is the data for the circle ?
              you say "value of the circle"
              can u specify what that means ?
              The delegate has access to the cell so it can have any values at the same time.
              So to avoid confusing, could you tell what data you need to paint the circle ?

              J Offline
              J Offline
              juaniyoalm
              wrote on last edited by juaniyoalm
              #77

              @mrjj
              Yeah, I need size array of fungivores in each cell to paint circle. This value can get it whit a method of Cell class.

              The data method of model can you see above.

              mrjjM 1 Reply Last reply
              0
              • J juaniyoalm

                @mrjj
                Yeah, I need size array of fungivores in each cell to paint circle. This value can get it whit a method of Cell class.

                The data method of model can you see above.

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #78

                @juaniyoalm
                well just do as @SGaist suggests and the delegate can use your custom role(s)
                to get the data it needs.
                user roles are nothing complicated at all.
                its just an id that let you assign a vlue to that id for an index.
                like
                model->setData(model->index(0,0), 90 , Qt::UserRole + 1 );

                To avoid to ugly code and stupid mistakes, we define it as a const.
                constexpr int CircleData = Qt::UserRole+1;
                constexpr int SomeOtherData = Qt::UserRole+2;

                and use instead of the raw value. This is a must to do. :)

                J 1 Reply Last reply
                0
                • mrjjM mrjj

                  @juaniyoalm
                  well just do as @SGaist suggests and the delegate can use your custom role(s)
                  to get the data it needs.
                  user roles are nothing complicated at all.
                  its just an id that let you assign a vlue to that id for an index.
                  like
                  model->setData(model->index(0,0), 90 , Qt::UserRole + 1 );

                  To avoid to ugly code and stupid mistakes, we define it as a const.
                  constexpr int CircleData = Qt::UserRole+1;
                  constexpr int SomeOtherData = Qt::UserRole+2;

                  and use instead of the raw value. This is a must to do. :)

                  J Offline
                  J Offline
                  juaniyoalm
                  wrote on last edited by
                  #79

                  @mrjj
                  But the problem is that I don't change the value with model->setData...., as I told you, I change it with methods place in Cell class and after emit signals to notified to model and call dataChanged method...

                  mrjjM 1 Reply Last reply
                  0
                  • J juaniyoalm

                    @mrjj
                    But the problem is that I don't change the value with model->setData...., as I told you, I change it with methods place in Cell class and after emit signals to notified to model and call dataChanged method...

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by
                    #80

                    @juaniyoalm

                    i dont see that matters with roles.
                    the delegate ask model and model get from the vector/cell so
                    should just be fine.

                    J 1 Reply Last reply
                    0
                    • mrjjM mrjj

                      @juaniyoalm

                      i dont see that matters with roles.
                      the delegate ask model and model get from the vector/cell so
                      should just be fine.

                      J Offline
                      J Offline
                      juaniyoalm
                      wrote on last edited by
                      #81

                      @mrjj

                      I can not return a cell in the data method of the model because it gives me an error:

                      0_1544553267398_Selección_002.png

                      mrjjM 1 Reply Last reply
                      0
                      • J juaniyoalm

                        @mrjj

                        I can not return a cell in the data method of the model because it gives me an error:

                        0_1544553267398_Selección_002.png

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by mrjj
                        #82

                        @juaniyoalm
                        you try to return a Cell pointer.
                        Should be like
                        mundo->getCell(index.row(), index.column())->somePublicVariable
                        or
                        mundo->getCell(index.row(), index.column())->Func(); // return some data, int , float , etc

                        Why you want to return the cell pointer ?
                        Just return some of its data

                        J 1 Reply Last reply
                        0
                        • mrjjM mrjj

                          @juaniyoalm
                          you try to return a Cell pointer.
                          Should be like
                          mundo->getCell(index.row(), index.column())->somePublicVariable
                          or
                          mundo->getCell(index.row(), index.column())->Func(); // return some data, int , float , etc

                          Why you want to return the cell pointer ?
                          Just return some of its data

                          J Offline
                          J Offline
                          juaniyoalm
                          wrote on last edited by juaniyoalm
                          #83

                          @mrjj

                          I think I'm not understanding ... hah.

                          If I put the following:

                          0_1544553931277_Selección_003.png

                          When I modify the value in this method:

                          0_1544554094879_Selección_004.png

                          Or these:

                          0_1544554184318_Selección_005.png

                          That signals activate this method (slot):

                          0_1544554310170_Selección_006.png

                          But in no time I pass the role and then the model does not know what data to return...

                          1 Reply Last reply
                          0
                          • mrjjM Offline
                            mrjjM Offline
                            mrjj
                            Lifetime Qt Champion
                            wrote on last edited by
                            #84

                            Hi
                            The view itself ask for
                            Qt::DisplayRole and Qt::EditRole ( if u edit cell )
                            the new roles was for the delegate to request data it needs.

                            You did study for more than a few minutes the
                            http://doc.qt.io/qt-5/model-view-programming.html
                            right ?

                            J 1 Reply Last reply
                            1
                            • mrjjM mrjj

                              Hi
                              The view itself ask for
                              Qt::DisplayRole and Qt::EditRole ( if u edit cell )
                              the new roles was for the delegate to request data it needs.

                              You did study for more than a few minutes the
                              http://doc.qt.io/qt-5/model-view-programming.html
                              right ?

                              J Offline
                              J Offline
                              juaniyoalm
                              wrote on last edited by
                              #85

                              @mrjj

                              Ok, I understand now. The problems are solved:

                              QVariant CellModel::data(const QModelIndex &index, int role) const
                              {
                                  if(!index.isValid())
                                      return QVariant();
                              
                                  if(index.row() >= mundo->getWorld().size() || index.row() < 0 ||
                                         index.column() >= mundo->getWorld()[0].size() || index.column() < 0)
                                      return QVariant();
                              
                                  if(role == CircleSize)
                                  {
                                      return this->mundo->getCell(index.row(), index.column())->getFungivoresSize();
                                  }
                              
                                  if(role == FoodCount)
                                  {
                                      return this->mundo->getCell(index.row(), index.column())->getFood();
                                  }
                                  return QVariant();
                              }
                              

                              And paint method:

                              void CellDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
                              {
                                  int cellValue = index.model()->data(index, Qt::UserRole+2).toInt();
                                  qreal circleValue = index.model()->data(index, Qt::UserRole+1).toInt();
                              
                                  qreal circleRealValue = (circleValue*20)/50;
                              
                                  painter->save();
                                  painter->fillRect(option.rect, QBrush(QColor((255 - cellValue), 255, 51)));
                              
                                  painter->setBrush(Qt::blue);
                                  painter->drawEllipse(static_cast<QPointF>(option.rect.center()), circleRealValue, circleRealValue);
                                  painter->setRenderHint(QPainter::Antialiasing, true);
                                  painter->setPen(Qt::NoPen);
                              
                                  painter->restore();
                              }
                              
                              1 Reply Last reply
                              2
                              • mrjjM Offline
                                mrjjM Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on last edited by
                                #86

                                Hi
                                Super.
                                Note you should try to reuse the CircleSize, FoodCount constexpr if possible
                                instead of Qt::UserRole+1.
                                you can just make a .h file and put them there and let both
                                model and delegate include it.

                                J 1 Reply Last reply
                                1
                                • mrjjM mrjj

                                  Hi
                                  Super.
                                  Note you should try to reuse the CircleSize, FoodCount constexpr if possible
                                  instead of Qt::UserRole+1.
                                  you can just make a .h file and put them there and let both
                                  model and delegate include it.

                                  J Offline
                                  J Offline
                                  juaniyoalm
                                  wrote on last edited by juaniyoalm
                                  #87

                                  @mrjj

                                  Ok I have already done it.

                                  I want to thank all of you who have tried to help me, especially @mrjj and @SGaist . You have had a lot of patience with me. Thank you.

                                  Surely I will have more questions about the project later. I'll stay here.

                                  mrjjM 1 Reply Last reply
                                  0
                                  • J juaniyoalm

                                    @mrjj

                                    Ok I have already done it.

                                    I want to thank all of you who have tried to help me, especially @mrjj and @SGaist . You have had a lot of patience with me. Thank you.

                                    Surely I will have more questions about the project later. I'll stay here.

                                    mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on last edited by mrjj
                                    #88

                                    @juaniyoalm
                                    Well good work then. :)
                                    Please mark as solved.
                                    You can always make new posts
                                    for new problems.

                                    and happy programming.

                                    1 Reply Last reply
                                    0

                                    • Login

                                    • Login or register to search.
                                    • First post
                                      Last post
                                    0
                                    • Categories
                                    • Recent
                                    • Tags
                                    • Popular
                                    • Users
                                    • Groups
                                    • Search
                                    • Get Qt Extensions
                                    • Unsolved