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Custom editor for a delegate

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  • M Offline
    M Offline
    Maser
    wrote on last edited by Maser
    #1

    Hi.
    Im trying to make a custom editor for a delegate in a tableview. I tried to subclass QWidget and use it as a editor. Problem is, when i start it standalone, if works. If i pass it in the delegates createEditor and setEditorData, its blinks fast and goes right to setModelData without waiting for input. and its shown as a regulan window, but i want it without the close, minimize and fullscreen buttons and right on the top over my tableview where i startet it and in a size i spezify without disturbing the tableview. I think i dont get the basics right. Can someone give me an outline how i have to define my class for that and what function i need to implement or override?

    1 Reply Last reply
    0
    • mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by mrjj
      #2

      hi
      ". and its shown as a regular window, "

      Are you sure u assign a parent?

      QWidget *myw=new QWidget(this); // "this" is parent

      QWidget *myw=new QWidget(); // no parent /default NULL)

      1 Reply Last reply
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      • M Offline
        M Offline
        Maser
        wrote on last edited by Maser
        #3

        No))) Well i was, but i forgot to call standard constructor from QWidget in my cpp. Now it pressing my editor in the cell of the tableview. Can i draw on top of the view?

        Joel BodenmannJ 1 Reply Last reply
        0
        • M Maser

          No))) Well i was, but i forgot to call standard constructor from QWidget in my cpp. Now it pressing my editor in the cell of the tableview. Can i draw on top of the view?

          Joel BodenmannJ Offline
          Joel BodenmannJ Offline
          Joel Bodenmann
          wrote on last edited by Joel Bodenmann
          #4

          To add to what @mrjj mentioned with the parent: You are actually supposed to assign the parent passed to the createEditor() function:

          QWidget* ComboboxDelegate::createEditor(QWidget* parent, const QStyleOptionViewItem& option, const QModelIndex& index) const
          {
              Q_UNUSED(option)
              Q_UNUSED(index)
          
              QComboBox* combobox = new QComboBox(parent);
              combobox->addItems({"Foo", "Bar", "mrjj"});
          
              return combobox;
          }
          

          Industrial process automation software: https://simulton.com
          Embedded Graphics & GUI library: https://ugfx.io

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          2
          • M Offline
            M Offline
            Maser
            wrote on last edited by
            #5

            @Joel. yes, i did.

            mrjjM 1 Reply Last reply
            0
            • M Maser

              @Joel. yes, i did.

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #6

              @Maser said:

              Can i draw on top of the view?

              yes , you can override paintEvent and call base paint then then draw your self but
              often there are better ways :)

              Can I ask why you want to draw on view?

              1 Reply Last reply
              1
              • M Offline
                M Offline
                Maser
                wrote on last edited by
                #7

                Well, my editor contains a number of images, from where i can choose one or several. as a markup that images are chosen i draw a red circle, around the activated ones. And the pictures are bigger, so they dont fit in the cell and the cell have to be resized when i draw it in the cell. So i figured i just draw it on top with a predefined size of a editorwidget.

                mrjjM 1 Reply Last reply
                0
                • M Maser

                  Well, my editor contains a number of images, from where i can choose one or several. as a markup that images are chosen i draw a red circle, around the activated ones. And the pictures are bigger, so they dont fit in the cell and the cell have to be resized when i draw it in the cell. So i figured i just draw it on top with a predefined size of a editorwidget.

                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #8

                  @Maser
                  ok. So its when you select the images, you want to draw over the view ? or
                  after you selected an image?

                  Im not sure how will it will work with scrolling etc.

                  1 Reply Last reply
                  0
                  • M Offline
                    M Offline
                    Maser
                    wrote on last edited by
                    #9

                    No, no. I want my editor widget drawn on top when i start editing the cell. After i made the editing, the editor is gone and the changed state or whatever in inside the cell. Just for editing.

                    1 Reply Last reply
                    0
                    • M Offline
                      M Offline
                      Maser
                      wrote on last edited by Maser
                      #10

                      So any suggestions how i do this painting over? I suppose i have to somehow get the coordinates of the cell, then draw a barebone widget und maybe adjust it in the tableview frame. But i dont know where to start. Are there some examples on that?

                      mrjjM 1 Reply Last reply
                      0
                      • M Maser

                        So any suggestions how i do this painting over? I suppose i have to somehow get the coordinates of the cell, then draw a barebone widget und maybe adjust it in the tableview frame. But i dont know where to start. Are there some examples on that?

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #11

                        @Maser
                        Hi,
                        Maybe you should look into a delegate ?
                        http://doc.qt.io/qt-5/qtwidgets-itemviews-stardelegate-example.html

                        A delegate is the normal way to change how content is drawn in each cell.

                        Painting on the actual view will often have side effects with scrolling etc.

                        If you want to see, you will override the paintEvent virtual function
                        and paint there.

                        1 Reply Last reply
                        2
                        • M Offline
                          M Offline
                          Maser
                          wrote on last edited by
                          #12

                          Im using a delegate. but i want the editor of the delegate drawn over the cell. I just need a hin how i connect the coordinates and draw a barebone widget. In wont have to be scrollable (yet).

                          mrjjM 1 Reply Last reply
                          0
                          • M Maser

                            Im using a delegate. but i want the editor of the delegate drawn over the cell. I just need a hin how i connect the coordinates and draw a barebone widget. In wont have to be scrollable (yet).

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

                            @Maser

                            Ok. Im not really following what u need. sorry.

                            In any case, you can override paintEvent for any widget and draw.
                            Notice that you cannot draw outside of the widgets client area so
                            make sure u override the paint for the actual widget u want to draw on.

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                            0
                            • M Offline
                              M Offline
                              Maser
                              wrote on last edited by Maser
                              #14

                              It seems overriding paintevent doesnt work. What does work(at least partially) is reimplementing updateEditorGeometry from the delegate. When i give the specific cell a bigger size for the editor it paints it bigger. Even the choosing works, but not when there is another cell under from the tableview under my editor-buttons. Dont yet know how to solve that.

                              mrjjM 1 Reply Last reply
                              0
                              • M Maser

                                It seems overriding paintevent doesnt work. What does work(at least partially) is reimplementing updateEditorGeometry from the delegate. When i give the specific cell a bigger size for the editor it paints it bigger. Even the choosing works, but not when there is another cell under from the tableview under my editor-buttons. Dont yet know how to solve that.

                                mrjjM Offline
                                mrjjM Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on last edited by
                                #15

                                @Maser
                                ok, can we see pic ?

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                                0
                                • M Offline
                                  M Offline
                                  Maser
                                  wrote on last edited by
                                  #16

                                  http://www.picfront.org/d/9q7X
                                  I marked the cell from which the editor has been activated. Problem is, as long is the items are of this cell or outside of the table, i can click them. if the are above other cells, the editor closes.

                                  mrjjM 1 Reply Last reply
                                  0
                                  • M Maser

                                    http://www.picfront.org/d/9q7X
                                    I marked the cell from which the editor has been activated. Problem is, as long is the items are of this cell or outside of the table, i can click them. if the are above other cells, the editor closes.

                                    mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #17

                                    @Maser
                                    Could you not just pop a dialog with
                                    all the images and let user select one?

                                    Or use a combobox with a delegate ?
                                    http://www.qtcentre.org/threads/26376-Using-images-in-QComboBox

                                    1 Reply Last reply
                                    0
                                    • M Offline
                                      M Offline
                                      Maser
                                      wrote on last edited by Maser
                                      #18

                                      This is a good idea)
                                      But since im trying to learn Qt, i will save it for the emergency plan)
                                      When i have a customer who wants it the exact way he described it, i wanna know how to do it, no matter of the cost)
                                      Have you an idea why the over cells interfere with my editor and how i can solve it?

                                      mrjjM 1 Reply Last reply
                                      0
                                      • M Maser

                                        This is a good idea)
                                        But since im trying to learn Qt, i will save it for the emergency plan)
                                        When i have a customer who wants it the exact way he described it, i wanna know how to do it, no matter of the cost)
                                        Have you an idea why the over cells interfere with my editor and how i can solve it?

                                        mrjjM Offline
                                        mrjjM Offline
                                        mrjj
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #19

                                        @Maser said:

                                        Have you an idea why the over cells interfere with my editor and how i can solve it?

                                        I assume that click goes to real cell as the images is just painted over it
                                        so u can not click on them as such.

                                        1 Reply Last reply
                                        1
                                        • M Offline
                                          M Offline
                                          Maser
                                          wrote on last edited by Maser
                                          #20

                                          No, i can. I told you. if i aim right in the black marked cell, i can click and unclick the three left items, i can also click the three right items. Just when i click anywhere in the tablecells, the editor is gone.

                                          PS: Maybe i have to somehow resize the "working area" of the cell to to fit my editor. I mean the clickable area associated with the cell. Idea on that?

                                          mrjjM 1 Reply Last reply
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