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tableWidget question

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  • J Offline
    J Offline
    jenya7
    wrote on last edited by jenya7
    #1

    I want to set the first column as a text box, the second as a combo box and third as a check box.
    Can I do it with the widget?

    JonBJ 1 Reply Last reply
    0
    • J jenya7

      I want to set the first column as a text box, the second as a combo box and third as a check box.
      Can I do it with the widget?

      JonBJ Offline
      JonBJ Offline
      JonB
      wrote on last edited by JonB
      #2

      @jenya7
      Yes, you should do so via https://doc.qt.io/qt-5/qabstractitemview.html#setItemDelegateForColumn with a https://doc.qt.io/qt-5/qstyleditemdelegate.html which you write for each of the desired column types.

      Although you might be tempted to use https://doc.qt.io/qt-5/qabstractitemview.html#setIndexWidget, you will have @VRonin descending on you like a ton of bricks here if you do so :)

      J VRoninV 2 Replies Last reply
      2
      • JonBJ JonB

        @jenya7
        Yes, you should do so via https://doc.qt.io/qt-5/qabstractitemview.html#setItemDelegateForColumn with a https://doc.qt.io/qt-5/qstyleditemdelegate.html which you write for each of the desired column types.

        Although you might be tempted to use https://doc.qt.io/qt-5/qabstractitemview.html#setIndexWidget, you will have @VRonin descending on you like a ton of bricks here if you do so :)

        J Offline
        J Offline
        jenya7
        wrote on last edited by
        #3

        @JonB
        Didn't understand much from the documentation how I apply all this specifically to a tableWidget.

        JonBJ 1 Reply Last reply
        0
        • J jenya7

          @JonB
          Didn't understand much from the documentation how I apply all this specifically to a tableWidget.

          JonBJ Offline
          JonBJ Offline
          JonB
          wrote on last edited by
          #4

          @jenya7
          A QTableWidget is derived from a QAbstractItemView so these methods are available (https://doc.qt.io/qt-5/qtablewidget-members.html). There is nothing special about it being a QTableWidget.

          J 1 Reply Last reply
          1
          • JonBJ JonB

            @jenya7
            A QTableWidget is derived from a QAbstractItemView so these methods are available (https://doc.qt.io/qt-5/qtablewidget-members.html). There is nothing special about it being a QTableWidget.

            J Offline
            J Offline
            jenya7
            wrote on last edited by
            #5

            @JonB said in tableWidget question:

            @jenya7
            A QTableWidget is derived from a QAbstractItemView so these methods are available (https://doc.qt.io/qt-5/qtablewidget-members.html). There is nothing special about it being a QTableWidget.

            It's all foreign language to me. I am completely new in Qt.

            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #6

              Hi,

              That is nothing specific to Qt. It's C++ inheritance.

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

              1 Reply Last reply
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              • mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #7

                Hi
                A delegate is a helper class that can draw the cell and/or also allows editing.
                Here is an example of a special one. Like a rating bar with stars
                https://doc.qt.io/qt-5/qtwidgets-itemviews-stardelegate-example.html

                You can see how to make one for a combobox here
                https://wiki.qt.io/Combo_Boxes_in_Item_Views
                This way can be used with any Widget you want. In the CreateEditor you just create another one. rest of code is much the same.

                For the checkbox, you can actually set on the Items you insert that they can be checked ( like a checkbox)

                QTableWidgetItem *item2 = new QTableWidgetItem("Item2");
                item2->setCheckState(Qt::Checked); // or unchecked
                tableWidget->setItem(0, 0, item2);
                
                J 1 Reply Last reply
                2
                • mrjjM mrjj

                  Hi
                  A delegate is a helper class that can draw the cell and/or also allows editing.
                  Here is an example of a special one. Like a rating bar with stars
                  https://doc.qt.io/qt-5/qtwidgets-itemviews-stardelegate-example.html

                  You can see how to make one for a combobox here
                  https://wiki.qt.io/Combo_Boxes_in_Item_Views
                  This way can be used with any Widget you want. In the CreateEditor you just create another one. rest of code is much the same.

                  For the checkbox, you can actually set on the Items you insert that they can be checked ( like a checkbox)

                  QTableWidgetItem *item2 = new QTableWidgetItem("Item2");
                  item2->setCheckState(Qt::Checked); // or unchecked
                  tableWidget->setItem(0, 0, item2);
                  
                  J Offline
                  J Offline
                  jenya7
                  wrote on last edited by
                  #8
                  This post is deleted!
                  J 1 Reply Last reply
                  0
                  • J jenya7

                    This post is deleted!

                    J Offline
                    J Offline
                    jenya7
                    wrote on last edited by jenya7
                    #9

                    @jenya7 said in tableWidget question:

                    @mrjj said in tableWidget question:

                    Hi
                    A delegate is a helper class that can draw the cell and/or also allows editing.
                    Here is an example of a special one. Like a rating bar with stars
                    https://doc.qt.io/qt-5/qtwidgets-itemviews-stardelegate-example.html

                    You can see how to make one for a combobox here
                    https://wiki.qt.io/Combo_Boxes_in_Item_Views
                    This way can be used with any Widget you want. In the CreateEditor you just create another one. rest of code is much the same.

                    For the checkbox, you can actually set on the Items you insert that they can be checked ( like a checkbox)

                    QTableWidgetItem *item2 = new QTableWidgetItem("Item2");
                    item2->setCheckState(Qt::Checked); // or unchecked
                    tableWidget->setItem(0, 0, item2);
                    

                    Thank you. The first argument is a row number. But tableWidget is not populated yet. I start to add rows and on every row I should call tableWidget->setItem(row_num, 0, item2); ?

                    JonBJ 1 Reply Last reply
                    0
                    • J jenya7

                      @jenya7 said in tableWidget question:

                      @mrjj said in tableWidget question:

                      Hi
                      A delegate is a helper class that can draw the cell and/or also allows editing.
                      Here is an example of a special one. Like a rating bar with stars
                      https://doc.qt.io/qt-5/qtwidgets-itemviews-stardelegate-example.html

                      You can see how to make one for a combobox here
                      https://wiki.qt.io/Combo_Boxes_in_Item_Views
                      This way can be used with any Widget you want. In the CreateEditor you just create another one. rest of code is much the same.

                      For the checkbox, you can actually set on the Items you insert that they can be checked ( like a checkbox)

                      QTableWidgetItem *item2 = new QTableWidgetItem("Item2");
                      item2->setCheckState(Qt::Checked); // or unchecked
                      tableWidget->setItem(0, 0, item2);
                      

                      Thank you. The first argument is a row number. But tableWidget is not populated yet. I start to add rows and on every row I should call tableWidget->setItem(row_num, 0, item2); ?

                      JonBJ Offline
                      JonBJ Offline
                      JonB
                      wrote on last edited by
                      #10

                      @jenya7
                      You can only do that once the row, row_num, exists in the table. You will need to have called https://doc.qt.io/qt-5/qtablewidget.html#insertRow to insert the row(s) beforehand.

                      1 Reply Last reply
                      2
                      • mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #11

                        Hi
                        This might come in handy
                        https://wiki.qt.io/How_to_Use_QTableWidget

                        J 1 Reply Last reply
                        1
                        • mrjjM mrjj

                          Hi
                          This might come in handy
                          https://wiki.qt.io/How_to_Use_QTableWidget

                          J Offline
                          J Offline
                          jenya7
                          wrote on last edited by
                          #12

                          @mrjj said in tableWidget question:

                          Hi
                          This might come in handy
                          https://wiki.qt.io/How_to_Use_QTableWidget

                          Thank you. One more question - after populating the table - how can I check/uncheck a check box in a row or to check a check box state?

                          mrjjM 1 Reply Last reply
                          0
                          • J jenya7

                            @mrjj said in tableWidget question:

                            Hi
                            This might come in handy
                            https://wiki.qt.io/How_to_Use_QTableWidget

                            Thank you. One more question - after populating the table - how can I check/uncheck a check box in a row or to check a check box state?

                            mrjjM Offline
                            mrjjM Offline
                            mrjj
                            Lifetime Qt Champion
                            wrote on last edited by mrjj
                            #13

                            @jenya7
                            Hi
                            There is https://doc.qt.io/qt-5/qtablewidget.html#item
                            where you can access the items to check or uncheck it.

                            But often you use some of the signals
                            like
                            https://doc.qt.io/qt-5/qtablewidget.html#itemChanged
                            and there you directly get the item.

                            J 1 Reply Last reply
                            1
                            • mrjjM mrjj

                              @jenya7
                              Hi
                              There is https://doc.qt.io/qt-5/qtablewidget.html#item
                              where you can access the items to check or uncheck it.

                              But often you use some of the signals
                              like
                              https://doc.qt.io/qt-5/qtablewidget.html#itemChanged
                              and there you directly get the item.

                              J Offline
                              J Offline
                              jenya7
                              wrote on last edited by
                              #14

                              @mrjj said in tableWidget question:

                              @jenya7
                              Hi
                              There is https://doc.qt.io/qt-5/qtablewidget.html#item
                              where you can access the items to check or uncheck it.

                              But often you use some of the signals
                              like
                              https://doc.qt.io/qt-5/qtablewidget.html#itemChanged
                              and there you directly get the item.

                              Thank you.

                              1 Reply Last reply
                              0
                              • J Offline
                                J Offline
                                jenya7
                                wrote on last edited by
                                #15

                                I did so

                                void sys::ParamLoadToTable(QTableWidget *table, int rows)
                                {
                                
                                    QTableWidgetItem item;
                                
                                    table->setRowCount(rows);
                                
                                    for (int i = 0; i < rows; i++)
                                    {
                                        auto box = new QCheckBox();
                                        box->setCheckState(Qt::Unchecked);
                                
                                        table->setCellWidget(i, 3, box);
                                
                                        item.setText(param_list[i].name);
                                        table->setItem(i, 1, &item);
                                    }
                                }
                                

                                I see all rows but column 1 (name) is empty.

                                1 Reply Last reply
                                0
                                • J Offline
                                  J Offline
                                  jenya7
                                  wrote on last edited by
                                  #16

                                  OK. This way it works

                                  for (int i = 0; i < rows; i++)
                                      {
                                          auto box = new QCheckBox();
                                          box->setCheckState(Qt::Unchecked);
                                  
                                          table->setCellWidget(i, 3, box);
                                  
                                           QTableWidgetItem  * item1 = new QTableWidgetItem();
                                           table->setItem(i, 1, item1);
                                         
                                           QTableWidgetItem  * item2 = new QTableWidgetItem();
                                            table->setItem(i, 2, item2);
                                  
                                          item1->setText(param_list[i].name);
                                          item2->setText(param_list[i].value);
                                      }
                                  
                                  1 Reply Last reply
                                  0
                                  • J Offline
                                    J Offline
                                    jenya7
                                    wrote on last edited by
                                    #17

                                    How can I check if a check box in the 4-th column is set?

                                    mrjjM 1 Reply Last reply
                                    0
                                    • J jenya7

                                      How can I check if a check box in the 4-th column is set?

                                      mrjjM Offline
                                      mrjjM Offline
                                      mrjj
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #18

                                      @jenya7
                                      Hi
                                      You can use
                                      https://doc.qt.io/qt-5/qtablewidget.html#cellWidget
                                      to gain access to the checkbox.

                                      J 1 Reply Last reply
                                      0
                                      • mrjjM mrjj

                                        @jenya7
                                        Hi
                                        You can use
                                        https://doc.qt.io/qt-5/qtablewidget.html#cellWidget
                                        to gain access to the checkbox.

                                        J Offline
                                        J Offline
                                        jenya7
                                        wrote on last edited by
                                        #19

                                        @mrjj said in tableWidget question:

                                        @jenya7
                                        Hi
                                        You can use
                                        https://doc.qt.io/qt-5/qtablewidget.html#cellWidget
                                        to gain access to the checkbox.

                                         QWidget *box = table->cellWidget(i, 3);
                                        

                                        Then what? How do I get the check box state from the object?

                                        mrjjM 1 Reply Last reply
                                        0
                                        • Christian EhrlicherC Offline
                                          Christian EhrlicherC Offline
                                          Christian Ehrlicher
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #20

                                          @jenya7 said in tableWidget question:

                                          How do I get the check box state from the object?

                                          Try to cast it to a QCheckBox (with e.g. dynamic_cast or Qt's specific qobject_cast) and retrieve the information.

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                                          1 Reply Last reply
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