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ignore shift to move between edit text

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  • VRoninV Offline
    VRoninV Offline
    VRonin
    wrote on last edited by VRonin
    #4

    I think there's a better way to do this than intercepting keys.
    What is the behaviour you want?
    What I see here is:
    The first key goes into the line you are focusing, the second key goes on the other line, the third key on the original line and so on. is it corrrect?

    "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
    ~Napoleon Bonaparte

    On a crusade to banish setIndexWidget() from the holy land of Qt

    R 1 Reply Last reply
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    • VRoninV VRonin

      I think there's a better way to do this than intercepting keys.
      What is the behaviour you want?
      What I see here is:
      The first key goes into the line you are focusing, the second key goes on the other line, the third key on the original line and so on. is it corrrect?

      R Offline
      R Offline
      rest
      wrote on last edited by rest
      #5

      @VRonin my scenario is like this -

      1. I have a barcode scanner connect to laptop with usb as are those in markets.
      2. when i scan first bar code to be inserted in first edit when i scan another barcode to go in second edit.

      But my problem now is like this each time i scan a barcode who contains a uppercase letter the part of code until the uppercase letter goes where it should be and the rest goes to the other edit is like im using, but other thing i saw is when i press shift he moves me between edit like i m using tab .

      JonBJ 1 Reply Last reply
      0
      • R rest

        @VRonin my scenario is like this -

        1. I have a barcode scanner connect to laptop with usb as are those in markets.
        2. when i scan first bar code to be inserted in first edit when i scan another barcode to go in second edit.

        But my problem now is like this each time i scan a barcode who contains a uppercase letter the part of code until the uppercase letter goes where it should be and the rest goes to the other edit is like im using, but other thing i saw is when i press shift he moves me between edit like i m using tab .

        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by
        #6

        @rest
        At some level I think you're telling us that your bar code scanner generates key events for the characters it meets?...

        I guess SHIFT itself raises a CWidget::keyPressEvent? So (given what you're doing), you better make your keyPressEvent code look to see if its the SHIFT key and not do the focus swap in that case. Your focus swap code is what is causing it to act like TAB.

        I suspect apart from that that your approach is wrong, but the above is to answer your question as to why it behaves as it does..

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        • JonBJ JonB

          @rest
          At some level I think you're telling us that your bar code scanner generates key events for the characters it meets?...

          I guess SHIFT itself raises a CWidget::keyPressEvent? So (given what you're doing), you better make your keyPressEvent code look to see if its the SHIFT key and not do the focus swap in that case. Your focus swap code is what is causing it to act like TAB.

          I suspect apart from that that your approach is wrong, but the above is to answer your question as to why it behaves as it does..

          R Offline
          R Offline
          rest
          wrote on last edited by
          #7

          @JonB so how you think i should approach this? i still think i need the keypressevent .. i don't have so much experience with working with qt and events

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

            Hi
            Did you use debugger and check what key combination that makes it
            "tab" to next edit ?
            I wondering if the jump happens when u pass the key to
            ui->leInformation->KeyPressEvent(event);
            (then we can maybe do different, like remove shift)

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            • mrjjM mrjj

              Hi
              Did you use debugger and check what key combination that makes it
              "tab" to next edit ?
              I wondering if the jump happens when u pass the key to
              ui->leInformation->KeyPressEvent(event);
              (then we can maybe do different, like remove shift)

              R Offline
              R Offline
              rest
              wrote on last edited by
              #9

              @mrjj i will make some debugging now, but is not about that cause i commented ui->leInformation->KeyPressEvent(event); and is the same

              mrjjM 1 Reply Last reply
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              • R rest

                @mrjj i will make some debugging now, but is not about that cause i commented ui->leInformation->KeyPressEvent(event); and is the same

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #10

                @rest
                if you dont forward the keys at all , it still jumps ?
                Ok, it sounds like the input trigger key navigation.

                I assume you are using an USB scanner in hid keyboard mode.

                You might want to install event filter on Application to find out what is going on.
                http://doc.qt.io/qt-5/qobject.html#installEventFilter

                https://stackoverflow.com/questions/26368659/qwidget-how-to-receive-keypressevent-inside-child-widgets

                Its hard to suggest what to do when we dont really know why input makes it focus next control.

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                • R Offline
                  R Offline
                  rest
                  wrote on last edited by
                  #11

                  so i made some debugging and when shift is pressed he gets inside my if and changes focus
                  alt text
                  0_1523557300643_dsdsdsdsds.PNG

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                  • R Offline
                    R Offline
                    rest
                    wrote on last edited by
                    #12

                    but witch one of the variables gets me the key pressed? i tried something like this !event->key() == Qt::ShiftModifier and doesnt work, there is another way to check?

                    mrjjM 1 Reply Last reply
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                    • R rest

                      but witch one of the variables gets me the key pressed? i tried something like this !event->key() == Qt::ShiftModifier and doesnt work, there is another way to check?

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

                      @rest said in ignore shift to move between edit text:

                      Qt::ShiftModifier

                      if(event->modifiers() & Qt::ShiftModifier){...}

                      1 Reply Last reply
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                      • R Offline
                        R Offline
                        rest
                        wrote on last edited by
                        #14

                        @mrjj thank you so much, i will try everything and see what works

                        JonBJ 1 Reply Last reply
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                        • R rest

                          @mrjj thank you so much, i will try everything and see what works

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by
                          #15

                          @rest
                          Be careful: I'm thinking you will get one event for just the SHIFT press, and then Qt::ShiftModifier will also still be true for the event which arrives for the B.

                          I don't get the whole intention of what you're trying to achieve with your code. You decide where input is to go based on:

                          if(focusWidget() == ui->lePath && !ui->lePath->text().isEmpty())
                          

                          Why? What's the logic here? What's the idea of switching focus here?

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                          • JonBJ JonB

                            @rest
                            Be careful: I'm thinking you will get one event for just the SHIFT press, and then Qt::ShiftModifier will also still be true for the event which arrives for the B.

                            I don't get the whole intention of what you're trying to achieve with your code. You decide where input is to go based on:

                            if(focusWidget() == ui->lePath && !ui->lePath->text().isEmpty())
                            

                            Why? What's the logic here? What's the idea of switching focus here?

                            R Offline
                            R Offline
                            rest
                            wrote on last edited by
                            #16

                            @JonB if i scanned a barcode means that focus is on first edit and he is not empty means i should change focus on second edit for scanning there, this is what i thought i don t have so much experience on this i don t really know how i can make this work

                            mrjjM JonBJ 2 Replies Last reply
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                            • R rest

                              @JonB if i scanned a barcode means that focus is on first edit and he is not empty means i should change focus on second edit for scanning there, this is what i thought i don t have so much experience on this i don t really know how i can make this work

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

                              @rest
                              How do you know first barcode data is 100% received ?
                              Since it comes key pr key. Is there an end of input char ?

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                              • R rest

                                @JonB if i scanned a barcode means that focus is on first edit and he is not empty means i should change focus on second edit for scanning there, this is what i thought i don t have so much experience on this i don t really know how i can make this work

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

                                @rest
                                But aren't you saying the "key presses for the barcode" are for each letter? When the second key arrives in lePath (it has the focus, and it's no longer empty), won't your code send it to leInformation?

                                R 1 Reply Last reply
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                                • R Offline
                                  R Offline
                                  rest
                                  wrote on last edited by
                                  #19

                                  No, i dont have something like that .. i don t know how to check this.. gets so difficult. first i had just one edit text and everything worked fine..

                                  1 Reply Last reply
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                                  • JonBJ JonB

                                    @rest
                                    But aren't you saying the "key presses for the barcode" are for each letter? When the second key arrives in lePath (it has the focus, and it's no longer empty), won't your code send it to leInformation?

                                    R Offline
                                    R Offline
                                    rest
                                    wrote on last edited by
                                    #20

                                    @JonB what you mean with second key? everything is well until the uppercase gets in, if i scan only digits everything is fine for both edits

                                    1 Reply Last reply
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                                    • mrjjM Offline
                                      mrjjM Offline
                                      mrjj
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #21

                                      You can try to use only click focus and not strong focus.

                                      1 Reply Last reply
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                                      • R Offline
                                        R Offline
                                        rest
                                        wrote on last edited by
                                        #22

                                        I realised i was doing something not necessary and my key event exactly checking that shift so i put my setfocus for first edit text in constructor and verified in key pressed event if event->text is empty to ignore it.

                                        1 Reply Last reply
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