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changing the checkstate of all the child item by checking the root item in Qtree widget

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  • JonBJ JonB

    @jsulm
    Does the (*iterator)->setCheckState(0, state); re-fire the on_treeWidget_itemChanged(QTreeWidgetItem *item, int column) for the child item's check state being changed? If so, good; if not, the OP will need a recursive function assuming he wants all descendants to get checked (and tree depth not limited to one level).

    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #11

    @JonB said in changing the checkstate of all the child item by checking the root item in Qtree widget:

    if not, the OP will need a recursive function assuming he wants all descendants to get checked

    No, that's what QTreeWidgetItemIterator is doing.

    https://forum.qt.io/topic/113070/qt-code-of-conduct

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    • jsulmJ jsulm

      @kook Why iterator->child?!
      First, check the check state of the parent, then apply that state on the children.

      auto state = item->checkState(0);
      QTreeWidgetItemIterator iterator(item);
      while (*iterator)
      {
              qDebug()<< (*iterator)->text(0);
              (*iterator)->setCheckState(0, state);
              ++iterator;
      }
      
      K Offline
      K Offline
      kook
      wrote on last edited by
      #12

      @jsulm the reason i used (*iterator)->child is i have multiple root in the tree i want only that particular root's child to be checked not the whole tree
      the solution you have given is doing the latter

      jsulmJ 1 Reply Last reply
      0
      • K kook

        @jsulm the reason i used (*iterator)->child is i have multiple root in the tree i want only that particular root's child to be checked not the whole tree
        the solution you have given is doing the latter

        jsulmJ Offline
        jsulmJ Offline
        jsulm
        Lifetime Qt Champion
        wrote on last edited by
        #13

        @kook The solution I gave you iterates over all children of an item, NOT the whole tree.
        If you want to change only some children of an item then you need a condition to decide which one to change, right? What is this condition? Can you explain what exactly should happen?

        https://forum.qt.io/topic/113070/qt-code-of-conduct

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        • jsulmJ jsulm

          @kook The solution I gave you iterates over all children of an item, NOT the whole tree.
          If you want to change only some children of an item then you need a condition to decide which one to change, right? What is this condition? Can you explain what exactly should happen?

          K Offline
          K Offline
          kook
          wrote on last edited by
          #14

          @jsulm Screenshot from 2021-10-11 10-56-53.png
          when i change the message1 state it should change only its children check state
          i tried the code you provided its changing the whole tree check state

          i don't have any specific condition

          jsulmJ 1 Reply Last reply
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          • K kook

            @jsulm Screenshot from 2021-10-11 10-56-53.png
            when i change the message1 state it should change only its children check state
            i tried the code you provided its changing the whole tree check state

            i don't have any specific condition

            jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #15

            @kook said in changing the checkstate of all the child item by checking the root item in Qtree widget:

            i tried the code you provided its changing the whole tree check state

            Then you did something wrong.
            What do you pass as item in this line QTreeWidgetItemIterator iterator(item); ?
            It needs to be the item user clicked (in your example message1).

            auto state = item->checkState(0);
            QTreeWidgetItemIterator iterator(item);
            while (*iterator)
            {
                    qDebug()<< (*iterator)->text(0);
                    (*iterator)->setCheckState(0, state);
                    ++iterator;
            }
            

            https://forum.qt.io/topic/113070/qt-code-of-conduct

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            • jsulmJ jsulm

              @kook said in changing the checkstate of all the child item by checking the root item in Qtree widget:

              i tried the code you provided its changing the whole tree check state

              Then you did something wrong.
              What do you pass as item in this line QTreeWidgetItemIterator iterator(item); ?
              It needs to be the item user clicked (in your example message1).

              auto state = item->checkState(0);
              QTreeWidgetItemIterator iterator(item);
              while (*iterator)
              {
                      qDebug()<< (*iterator)->text(0);
                      (*iterator)->setCheckState(0, state);
                      ++iterator;
              }
              
              K Offline
              K Offline
              kook
              wrote on last edited by
              #16

              @jsulm i am adding the code inside this function

              void MainWindow::on_treeWidget_itemChanged(QTreeWidgetItem *item, int column)
              {
              }
              jsulmJ 2 Replies Last reply
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              • K kook

                @jsulm i am adding the code inside this function

                void MainWindow::on_treeWidget_itemChanged(QTreeWidgetItem *item, int column)
                {
                }
                jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #17

                @kook You're right. This does not work as expected.
                You will need to write a recursive method to iterate over all children of an item.

                https://forum.qt.io/topic/113070/qt-code-of-conduct

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                • K kook

                  @jsulm i am adding the code inside this function

                  void MainWindow::on_treeWidget_itemChanged(QTreeWidgetItem *item, int column)
                  {
                  }
                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by jsulm
                  #18

                  @kook This works:

                  void MainWindow::on_treeWidget_itemChanged(QTreeWidgetItem *item, int column)
                      for (int i = 0; i < item->childCount(); ++i) {
                          qDebug() << item->child(i)->text(0);
                          on_treeWidget_itemChanged(item->child(i), column);
                      }
                  }
                  

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • jsulmJ jsulm

                    @kook You're right. This does not work as expected.
                    You will need to write a recursive method to iterate over all children of an item.

                    K Offline
                    K Offline
                    kook
                    wrote on last edited by
                    #19

                    @jsulm ok i will try thank you

                    jsulmJ 1 Reply Last reply
                    0
                    • K kook

                      @jsulm ok i will try thank you

                      jsulmJ Offline
                      jsulmJ Offline
                      jsulm
                      Lifetime Qt Champion
                      wrote on last edited by
                      #20

                      @kook I just fixed my code...

                      https://forum.qt.io/topic/113070/qt-code-of-conduct

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                      • jsulmJ jsulm

                        @kook I just fixed my code...

                        K Offline
                        K Offline
                        kook
                        wrote on last edited by
                        #21

                        @jsulm its not changing the checked state of children

                        jsulmJ 1 Reply Last reply
                        0
                        • K kook

                          @jsulm its not changing the checked state of children

                          jsulmJ Offline
                          jsulmJ Offline
                          jsulm
                          Lifetime Qt Champion
                          wrote on last edited by jsulm
                          #22

                          @kook said in changing the checkstate of all the child item by checking the root item in Qtree widget:

                          its not changing the checked state of children

                          Come on, that's because I did not add the code to change the checked state. Add that part:

                          void MainWindow::on_treeWidget_itemChanged(QTreeWidgetItem *item, int column)
                              for (int i = 0; i < item->childCount(); ++i) {
                                  qDebug() << item->child(i)->text(0);
                                  item->child(i)->setCheckState(0, item->checkState(0));
                                  on_treeWidget_itemChanged(item->child(i), column);
                              }
                          }
                          

                          https://forum.qt.io/topic/113070/qt-code-of-conduct

                          K 1 Reply Last reply
                          3
                          • jsulmJ jsulm

                            @kook said in changing the checkstate of all the child item by checking the root item in Qtree widget:

                            its not changing the checked state of children

                            Come on, that's because I did not add the code to change the checked state. Add that part:

                            void MainWindow::on_treeWidget_itemChanged(QTreeWidgetItem *item, int column)
                                for (int i = 0; i < item->childCount(); ++i) {
                                    qDebug() << item->child(i)->text(0);
                                    item->child(i)->setCheckState(0, item->checkState(0));
                                    on_treeWidget_itemChanged(item->child(i), column);
                                }
                            }
                            
                            K Offline
                            K Offline
                            kook
                            wrote on last edited by
                            #23

                            @jsulm sorry i added that part its working
                            thank you for your time and solution

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