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How to Insert checkbox in root of Qtreeview. Treeview is created by using QDOMDocument reading XML file.

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  • Aviral 0A Aviral 0

    @JonB Yes, the checkbox appeared but not working as check or unchecked.

    JonBJ Online
    JonBJ Online
    JonB
    wrote on last edited by
    #9

    @Aviral-0
    Your DomModel::data() method has correct code to look at item->isChecked() to see whether to show checked/unchecked. But I do not see anywhere in your code which sets any DomItem (or its QDomNode returned by node()) to record that it has been checked. You have to store that somewhere. And if DomModel::data() looks at item->isChecked() for CheckStateRole I think I would expect you to have a corresponding setData() with case for CheckStateRole which calls an item->setChecked().

    Aviral 0A 1 Reply Last reply
    1
    • JonBJ JonB

      @Aviral-0
      Your DomModel::data() method has correct code to look at item->isChecked() to see whether to show checked/unchecked. But I do not see anywhere in your code which sets any DomItem (or its QDomNode returned by node()) to record that it has been checked. You have to store that somewhere. And if DomModel::data() looks at item->isChecked() for CheckStateRole I think I would expect you to have a corresponding setData() with case for CheckStateRole which calls an item->setChecked().

      Aviral 0A Offline
      Aviral 0A Offline
      Aviral 0
      wrote on last edited by
      #10

      @JonB Thankyou, using setData() method the items are now checkable.
      Just one thing I am not understanding. you said about
      QModelIndex QAbstractItemView::rootIndex() const
      I am not able to understand how to use it and where to use it.
      as on website its not indepth elaboration about it.

      JonBJ 1 Reply Last reply
      0
      • Aviral 0A Aviral 0

        @JonB Thankyou, using setData() method the items are now checkable.
        Just one thing I am not understanding. you said about
        QModelIndex QAbstractItemView::rootIndex() const
        I am not able to understand how to use it and where to use it.
        as on website its not indepth elaboration about it.

        JonBJ Online
        JonBJ Online
        JonB
        wrote on last edited by JonB
        #11

        @Aviral-0

        Qt::ItemFlags DomModel::flags(const QModelIndex &index) const
        {
            if ( index.column() == 0 )
                flags |= Qt::ItemIsUserCheckable;
        

        You said, I believe, that you only want a checkbox if it is the root index. You want to know whether index is the root index here. I realize now that QModelIndex QAbstractItemView::rootIndex() const is a method of the QTreeView and not available in model flags code. Is the root index row 0 in the model (I don't know)? So you would need maybe && index.row() == 0?

        Aviral 0A 1 Reply Last reply
        1
        • JonBJ JonB

          @Aviral-0

          Qt::ItemFlags DomModel::flags(const QModelIndex &index) const
          {
              if ( index.column() == 0 )
                  flags |= Qt::ItemIsUserCheckable;
          

          You said, I believe, that you only want a checkbox if it is the root index. You want to know whether index is the root index here. I realize now that QModelIndex QAbstractItemView::rootIndex() const is a method of the QTreeView and not available in model flags code. Is the root index row 0 in the model (I don't know)? So you would need maybe && index.row() == 0?

          Aviral 0A Offline
          Aviral 0A Offline
          Aviral 0
          wrote on last edited by
          #12

          @JonB Using
          && index.row() == 0
          also didn't worked. I think index contains the current item location in tree

          JonBJ 1 Reply Last reply
          0
          • Aviral 0A Aviral 0

            @JonB Using
            && index.row() == 0
            also didn't worked. I think index contains the current item location in tree

            JonBJ Online
            JonBJ Online
            JonB
            wrote on last edited by
            #13

            @Aviral-0
            Your QTreeView has a root index, the one you want a checkbox against, right? How did that get set? You want to know that index in the model code so that you can check for it your data() code, right?

            Aviral 0A 2 Replies Last reply
            1
            • JonBJ JonB

              @Aviral-0
              Your QTreeView has a root index, the one you want a checkbox against, right? How did that get set? You want to know that index in the model code so that you can check for it your data() code, right?

              Aviral 0A Offline
              Aviral 0A Offline
              Aviral 0
              wrote on last edited by
              #14

              @JonB Sorry Jon, I really didn't understand. I am very new to coding.
              In simple terms, yes I need checkbox only at root node.
              Should I send you my updated code?

              1 Reply Last reply
              0
              • JonBJ JonB

                @Aviral-0
                Your QTreeView has a root index, the one you want a checkbox against, right? How did that get set? You want to know that index in the model code so that you can check for it your data() code, right?

                Aviral 0A Offline
                Aviral 0A Offline
                Aviral 0
                wrote on last edited by
                #15

                @JonB Please have a look at it.
                https://github.com/aviralarpit/QTDomDoc.git

                JonBJ 1 Reply Last reply
                0
                • Aviral 0A Aviral 0

                  @JonB Please have a look at it.
                  https://github.com/aviralarpit/QTDomDoc.git

                  JonBJ Online
                  JonBJ Online
                  JonB
                  wrote on last edited by
                  #16

                  @Aviral-0
                  class DomModel has QModelIndex rootIndex() const; (though can't see an implementation?) or DomItem *rootItem you can use to identify the root item.

                  Aviral 0A 2 Replies Last reply
                  1
                  • JonBJ JonB

                    @Aviral-0
                    class DomModel has QModelIndex rootIndex() const; (though can't see an implementation?) or DomItem *rootItem you can use to identify the root item.

                    Aviral 0A Offline
                    Aviral 0A Offline
                    Aviral 0
                    wrote on last edited by
                    #17

                    @JonB I tried to use rootIndex() function but didn't understood how to.
                    Its just declaration.

                    JonBJ 1 Reply Last reply
                    0
                    • Aviral 0A Aviral 0

                      @JonB I tried to use rootIndex() function but didn't understood how to.
                      Its just declaration.

                      JonBJ Online
                      JonBJ Online
                      JonB
                      wrote on last edited by JonB
                      #18

                      @Aviral-0 Which is what I thought and why I suggested you try recognising if the item is the rootItem.

                      1 Reply Last reply
                      0
                      • JonBJ JonB

                        @Aviral-0
                        class DomModel has QModelIndex rootIndex() const; (though can't see an implementation?) or DomItem *rootItem you can use to identify the root item.

                        Aviral 0A Offline
                        Aviral 0A Offline
                        Aviral 0
                        wrote on last edited by
                        #19

                        @JonB I know its alot to ask, but can you tell me what change should I do specifically to make it work. It will be so nice of you taking your time to help me. Thankyou Brother.

                        JonBJ 1 Reply Last reply
                        0
                        • Aviral 0A Aviral 0

                          @JonB I know its alot to ask, but can you tell me what change should I do specifically to make it work. It will be so nice of you taking your time to help me. Thankyou Brother.

                          JonBJ Online
                          JonBJ Online
                          JonB
                          wrote on last edited by
                          #20

                          @Aviral-0
                          I'm not your Brother!

                          I think you want in flags():

                              DomItem *item = static_cast<DomItem*>(index.internalPointer());
                              if (item == rootItem)
                                  flags |= Qt::ItemIsUserCheckable;
                          

                          to make it so only the root item is checkable.

                          Aviral 0A 3 Replies Last reply
                          1
                          • JonBJ JonB

                            @Aviral-0
                            I'm not your Brother!

                            I think you want in flags():

                                DomItem *item = static_cast<DomItem*>(index.internalPointer());
                                if (item == rootItem)
                                    flags |= Qt::ItemIsUserCheckable;
                            

                            to make it so only the root item is checkable.

                            Aviral 0A Offline
                            Aviral 0A Offline
                            Aviral 0
                            wrote on last edited by
                            #21

                            @JonB Sorry, it didn't worked :'(

                            1 Reply Last reply
                            0
                            • JonBJ JonB

                              @Aviral-0
                              I'm not your Brother!

                              I think you want in flags():

                                  DomItem *item = static_cast<DomItem*>(index.internalPointer());
                                  if (item == rootItem)
                                      flags |= Qt::ItemIsUserCheckable;
                              

                              to make it so only the root item is checkable.

                              Aviral 0A Offline
                              Aviral 0A Offline
                              Aviral 0
                              wrote on last edited by
                              #22

                              @JonB I have solved this.
                              By using
                              DomModel::data(){
                              if ( role == Qt::CheckStateRole && !index.parent().isValid())
                              }

                              JonBJ 1 Reply Last reply
                              0
                              • JonBJ JonB

                                @Aviral-0
                                I'm not your Brother!

                                I think you want in flags():

                                    DomItem *item = static_cast<DomItem*>(index.internalPointer());
                                    if (item == rootItem)
                                        flags |= Qt::ItemIsUserCheckable;
                                

                                to make it so only the root item is checkable.

                                Aviral 0A Offline
                                Aviral 0A Offline
                                Aviral 0
                                wrote on last edited by
                                #23

                                @JonB Hi Jon, just one more thing needed.
                                I want to Highlight the items of tree which is selected, like when we do multiple selection using CTRL button, the selected lines should be in blue highlight or their fonts can done Bold to make selected Items looks different.
                                How should I do it? any idea ?

                                1 Reply Last reply
                                0
                                • Aviral 0A Aviral 0

                                  @JonB I have solved this.
                                  By using
                                  DomModel::data(){
                                  if ( role == Qt::CheckStateRole && !index.parent().isValid())
                                  }

                                  JonBJ Online
                                  JonBJ Online
                                  JonB
                                  wrote on last edited by
                                  #24

                                  @Aviral-0 said in How to Insert checkbox in root of Qtreeview. Treeview is created by using QDOMDocument reading XML file.:

                                  && !index.parent().isValid()

                                  Ah, well done! I kind of thought that was for a child of the root element, and the root element was that parent. But I think it makes sense, I haven't actually ever used QTreeView I don't think.

                                  Do you mean you only want to alter presentation when multiple items are selected, not just a single one? Normally you would do colour/font via stylesheet on selected items. But that won't distinguish multiple versus single selection. QTreeView::selectionModel/selectedIndexes() gives you which items/indexes are selected, that's all I know, somehow work from there?

                                  Aviral 0A 1 Reply Last reply
                                  1
                                  • JonBJ JonB

                                    @Aviral-0 said in How to Insert checkbox in root of Qtreeview. Treeview is created by using QDOMDocument reading XML file.:

                                    && !index.parent().isValid()

                                    Ah, well done! I kind of thought that was for a child of the root element, and the root element was that parent. But I think it makes sense, I haven't actually ever used QTreeView I don't think.

                                    Do you mean you only want to alter presentation when multiple items are selected, not just a single one? Normally you would do colour/font via stylesheet on selected items. But that won't distinguish multiple versus single selection. QTreeView::selectionModel/selectedIndexes() gives you which items/indexes are selected, that's all I know, somehow work from there?

                                    Aviral 0A Offline
                                    Aviral 0A Offline
                                    Aviral 0
                                    wrote on last edited by
                                    #25

                                    @JonB I am trying this piece of code:
                                    const bool shouldBeBold = (index.column() == 0);
                                    if (role == Qt::FontRole && shouldBeBold) {
                                    QFont boldFont;
                                    boldFont.setBold(true);
                                    return boldFont;
                                    } else {
                                    return DomModel::data(index, role);
                                    }

                                    you repied to this code in past at someone elses pproblem.
                                    but its not working

                                    JonBJ 1 Reply Last reply
                                    0
                                    • Aviral 0A Aviral 0

                                      @JonB I am trying this piece of code:
                                      const bool shouldBeBold = (index.column() == 0);
                                      if (role == Qt::FontRole && shouldBeBold) {
                                      QFont boldFont;
                                      boldFont.setBold(true);
                                      return boldFont;
                                      } else {
                                      return DomModel::data(index, role);
                                      }

                                      you repied to this code in past at someone elses pproblem.
                                      but its not working

                                      JonBJ Online
                                      JonBJ Online
                                      JonB
                                      wrote on last edited by
                                      #26

                                      @Aviral-0
                                      Debugging techniques:

                                      • Put a qDebug() into your if statement, does it get hit at all?
                                      • Set shouldBeBold = true unconditionally, does any items come up in bold?
                                      • Try, say, role == Qt::ForegroundRole and return QColor(Qt::red), does that work in case it's some bold issue?
                                      • If you are doing this on selected items it might be that selection sets font instead, I don't know.
                                      Aviral 0A 1 Reply Last reply
                                      0
                                      • JonBJ JonB

                                        @Aviral-0
                                        Debugging techniques:

                                        • Put a qDebug() into your if statement, does it get hit at all?
                                        • Set shouldBeBold = true unconditionally, does any items come up in bold?
                                        • Try, say, role == Qt::ForegroundRole and return QColor(Qt::red), does that work in case it's some bold issue?
                                        • If you are doing this on selected items it might be that selection sets font instead, I don't know.
                                        Aviral 0A Offline
                                        Aviral 0A Offline
                                        Aviral 0
                                        wrote on last edited by
                                        #27

                                        @JonB Nothing worked. any other ideas?

                                        JonBJ 1 Reply Last reply
                                        0
                                        • Aviral 0A Aviral 0

                                          @JonB Nothing worked. any other ideas?

                                          JonBJ Online
                                          JonBJ Online
                                          JonB
                                          wrote on last edited by
                                          #28

                                          @Aviral-0
                                          If "nothing worked" that means you are saying your code is not being called at all. I cannot help if you say that is the case.

                                          Aviral 0A 2 Replies Last reply
                                          0

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