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Communication between QWidgets in Stacked Window

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stackedwidgetsignals&slots
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  • lagodolioL Offline
    lagodolioL Offline
    lagodolio
    wrote on last edited by A Former User
    #1

    Hello,
    I'm new in Qt and I have a trouble that stop me for a week...Ok it's probably a stupid question but I tried different ways with no success.
    I have to assemble some QWidget created by Qt Creator, the first one ( we call it "pag1", it is composed by "pag1.ui", "pag1.h" and "pag1.cpp") shows a window with some text,controls and a button "Go to Page 2", the second qWidget has text and controls.
    Finally, we have a main window (MainWindow) with controls and a Stacked Window. By "promote" function I linked pag1 widget to Stacked Window first page (Page1) and pag2 to the second one (Page2).
    I have no problem if I call pag1 and pag2 by main window, but I'm no able to make button "Go to Page 2" ordering Mainwindow to erase Page1 and show Page2.
    Any solutions? I tried signals and slot (I think it's the correct way), but pag1 doesn't see pag2...
    Thanks for all and good days!
    Mario

    RatzzR 1 Reply Last reply
    0
    • lagodolioL lagodolio

      Hello,
      I'm new in Qt and I have a trouble that stop me for a week...Ok it's probably a stupid question but I tried different ways with no success.
      I have to assemble some QWidget created by Qt Creator, the first one ( we call it "pag1", it is composed by "pag1.ui", "pag1.h" and "pag1.cpp") shows a window with some text,controls and a button "Go to Page 2", the second qWidget has text and controls.
      Finally, we have a main window (MainWindow) with controls and a Stacked Window. By "promote" function I linked pag1 widget to Stacked Window first page (Page1) and pag2 to the second one (Page2).
      I have no problem if I call pag1 and pag2 by main window, but I'm no able to make button "Go to Page 2" ordering Mainwindow to erase Page1 and show Page2.
      Any solutions? I tried signals and slot (I think it's the correct way), but pag1 doesn't see pag2...
      Thanks for all and good days!
      Mario

      RatzzR Offline
      RatzzR Offline
      Ratzz
      wrote on last edited by
      #2

      @lagodolio
      Have you created pages using QStackedWidget http://doc.qt.io/qt-4.8/qstackedwidget.html ?

      --Alles ist gut.

      1 Reply Last reply
      0
      • lagodolioL Offline
        lagodolioL Offline
        lagodolio
        wrote on last edited by A Former User
        #3

        Yes, I created a QStackedWidget by Qt Creator. I can see it in mainwindows.ui, but it is not editable...

        RatzzR 1 Reply Last reply
        0
        • lagodolioL lagodolio

          Yes, I created a QStackedWidget by Qt Creator. I can see it in mainwindows.ui, but it is not editable...

          RatzzR Offline
          RatzzR Offline
          Ratzz
          wrote on last edited by
          #4

          @lagodolio
          can you create a minimal sample to reproduce it?

          --Alles ist gut.

          lagodolioL 1 Reply Last reply
          0
          • RatzzR Ratzz

            @lagodolio
            can you create a minimal sample to reproduce it?

            lagodolioL Offline
            lagodolioL Offline
            lagodolio
            wrote on last edited by A Former User
            #5

            @Ratzz Yes, of course.
            As my project, this sample is created by Qt Creator. The program is called by inter_comm.pro.
            Thank you in advance and have a nice weekend,
            Mario

            This is the zip file - fully editable

            RatzzR 1 Reply Last reply
            0
            • lagodolioL lagodolio

              @Ratzz Yes, of course.
              As my project, this sample is created by Qt Creator. The program is called by inter_comm.pro.
              Thank you in advance and have a nice weekend,
              Mario

              This is the zip file - fully editable

              RatzzR Offline
              RatzzR Offline
              Ratzz
              wrote on last edited by Ratzz
              #6

              @lagodolio
              You need not create two new pages separately rather you can use 2 stack pages to achieve this.

              --Alles ist gut.

              1 Reply Last reply
              2
              • lagodolioL Offline
                lagodolioL Offline
                lagodolio
                wrote on last edited by
                #7

                Hello Ratzz and thanks for your support.
                My problem is that every page is quite complex ( data analysis and processing / system control /database management ). A friend of mine and I are creating autonomous programs so we are able to work quite independently.
                Thanks to qt library we are going to assemble those parts in GUI style ( we initially used Processing, but we abandon it because of performance).
                Those programs (they appear as stacked pages) have to call each other, just like "pag1" of my little sample calls pag2.
                Thank you and happy weekend to all the forum!
                Mario

                mrjjM 1 Reply Last reply
                0
                • lagodolioL lagodolio

                  Hello Ratzz and thanks for your support.
                  My problem is that every page is quite complex ( data analysis and processing / system control /database management ). A friend of mine and I are creating autonomous programs so we are able to work quite independently.
                  Thanks to qt library we are going to assemble those parts in GUI style ( we initially used Processing, but we abandon it because of performance).
                  Those programs (they appear as stacked pages) have to call each other, just like "pag1" of my little sample calls pag2.
                  Thank you and happy weekend to all the forum!
                  Mario

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

                  @lagodolio
                  hi
                  Are you asking how you can access widgets from one page to another page ?

                  private:
                  Ui::pag1 *ui;

                  or what do you mean by
                  "..have to call each other," ?

                  If each page is a module, you should define public signals for the processing result.
                  You can then connect page1 to page2 for piping.

                  in your sample the pages are QMainWindows.
                  you put them in stacked widget??

                  1 Reply Last reply
                  0
                  • lagodolioL Offline
                    lagodolioL Offline
                    lagodolio
                    wrote on last edited by
                    #9

                    Sorry , to be honest "..have to call each other" is not very clear... It means that some widgets promoted in stacked windows have a button that call another widget in stacked windows.
                    My sample pag1.cpp should be something as:

                    // /* pag1.cpp*/
                    
                    #include "pag1.h"
                    #include "ui_pag1.h"
                    
                    pag1::pag1(QWidget *parent) :
                        QMainWindow(parent),
                        ui(new Ui::pag1)
                    {
                        ui->setupUi(this);
                    }
                    
                    pag1::~pag1()
                    {
                        delete ui;
                    }
                    
                    void pag1::on_pushButton_clicked()
                    {
                      /********************************************
                        Do something as:
                        ui->pag1->>setHidden(true);
                        ui->pag2>>setHidden(false);
                    **********************************************/    
                      
                    }
                    
                    
                    1 Reply Last reply
                    0
                    • mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by mrjj
                      #10

                      Hi
                      you cannot talk to other pages from a page
                      that would become spaghetti code if all pages must know all other pages.

                      What you can do is to to let mainwindow control the pages.
                      since it already have the stacked widget.

                      So you use signals and slot to make this happen.

                      I have altered your sample to do this:
                      https://www.dropbox.com/s/elj1zqu9ts73hur/stk.zip?dl=0

                      The change are:
                      Define signal for page
                      emit ShowPage( 1 ); from button

                      in mainwindow
                      make slot
                      connect( ui->page, SIGNAL(ShowPage(int)), this, SLOT(ShowPage(int)) );

                      and

                      // this is called from pages via signal
                      void MainWindow::ShowPage(int index) {
                      qDebug() << "show page request: " << index;
                      // do the actual switch
                      ui->stackedWidget->setCurrentIndex(index);
                      }

                      Now a page can ask to switch to other page.
                      You can do this for any other function or info you want between pages.

                      1 Reply Last reply
                      1
                      • lagodolioL Offline
                        lagodolioL Offline
                        lagodolio
                        wrote on last edited by
                        #11

                        Wow, it works!
                        You are right, this approach is more efficient ( and elegant too) rather then my code
                        Thanks for all, now I can start working ( after a week ...).
                        Have a nice days.
                        Mario

                        mrjjM 1 Reply Last reply
                        0
                        • lagodolioL lagodolio

                          Wow, it works!
                          You are right, this approach is more efficient ( and elegant too) rather then my code
                          Thanks for all, now I can start working ( after a week ...).
                          Have a nice days.
                          Mario

                          mrjjM Offline
                          mrjjM Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on last edited by
                          #12

                          @lagodolio
                          super :)

                          just a note:
                          If you design a base class for pages and inherit from that, you can
                          just define the signals for showpage, and what else you need , in
                          this base class and all pages can be hooked up pr default.

                          1 Reply Last reply
                          0
                          • lagodolioL Offline
                            lagodolioL Offline
                            lagodolio
                            wrote on last edited by
                            #13

                            Perfect !

                            1 Reply Last reply
                            0

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