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  4. when i write text on QLineEdit that text shows on QLabel
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when i write text on QLineEdit that text shows on QLabel

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  • dheerendraD Offline
    dheerendraD Offline
    dheerendra
    Qt Champions 2022
    wrote on last edited by dheerendra
    #2

    Did you study signal & slots topic ? Did you see signals in lineedit and slots in labels? These two hints should be able to solve your issue.

    Dheerendra
    @Community Service
    Certified Qt Specialist
    http://www.pthinks.com

    1 Reply Last reply
    0
    • D Offline
      D Offline
      Dimple
      wrote on last edited by VRonin
      #3

      MainWindow.h

      signals:
      void textChanged(const QString &text);
      
      //public slots:
      //void recvText(const QString &text);
      
      
      private slots:
        void on_pushButton_clicked();
      
        void on_lineEdit_textChanged(const QString &text);
      
        void on_label_linkActivated(const QString &link);
      

      MainWindow.cpp

         connect(ui->lineEdit,SIGNAL(textChanged(QString)),
                ui->label,SLOT(linkActivated(QString)));
      
      // connect(ui->lineEdit,SIGNAL(textChanged(QString)),
          //      ui->label,SLOT(on_label_linkActivated(QString)));
      
      }
      
      MainWindow::~MainWindow()
      {
          delete ui;
      }
      
      void MainWindow::on_pushButton_clicked()
      {
      ui->lineEdit->show();
      ui->label->show();
      
      
      }
      
      void MainWindow::on_lineEdit_textChanged(const QString &text)
      {
         // emit textChanged(const QString  &text);
         // QString text = lineedit->text();
           emit textChanged(text);
      
           ui->label->show();
      
      }
      
      void MainWindow::on_label_linkActivated(const QString &text)
      {
          QString input= text;
          ui->label->clear();
          ui->label->setText(input);
          ui->label->update();
          ui->label->show();
      
      }
      

      can u guess my mistakes pls?

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

        I don't see anything related to QListWidget here...

        "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

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        • D Offline
          D Offline
          Dimple
          wrote on last edited by
          #5

          0_1547636824629_ui.PNG
          on ui page i took QListWidget ,,,on qlist widget i placed QPushbutton ,QLineEdit & QLabel

          can u pls send correct code ??

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          • VRoninV Offline
            VRoninV Offline
            VRonin
            wrote on last edited by
            #6

            Do you want a button and a label for each element in your list or just 1?

            "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

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            • D Offline
              D Offline
              Dimple
              wrote on last edited by
              #7

              Thanks for ur reply,,
              No need pushbutton ,,,only QLineEdit & QLabel,,,when i text anything on QLineEdit that text should shows on QLabel thatsit ,,,

              already when i clicked on QPushButton ,,,QLineEdit is showing ,,after write some text on QLineEdit that text should shows on Qlabel

              mrjjM 1 Reply Last reply
              0
              • D Dimple

                Thanks for ur reply,,
                No need pushbutton ,,,only QLineEdit & QLabel,,,when i text anything on QLineEdit that text should shows on QLabel thatsit ,,,

                already when i clicked on QPushButton ,,,QLineEdit is showing ,,after write some text on QLineEdit that text should shows on Qlabel

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

                @Dimple
                Hi
                and what does the QListWidget do ?

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                0
                • D Offline
                  D Offline
                  Dimple
                  wrote on last edited by
                  #9

                  After input some text in edittext, QLabel will be changed with this text in QListWidgetItem.

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                  0
                  • VRoninV Offline
                    VRoninV Offline
                    VRonin
                    wrote on last edited by
                    #10

                    Do you want to add items to the list?
                    Should the button enable the editing of existing items?
                    Do you really need the button (QListWidget by default does what you want on existing items)?

                    "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

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                    0
                    • D Offline
                      D Offline
                      Dimple
                      wrote on last edited by Dimple
                      #11

                      -> yes ,, i want to add items to the list .
                      ->i want to add some sample datas(EX: Hi ,,hello,,999,,22...etc)
                      just for testing

                      Actually the goal we must to do is adding and updating contacts in contacts listwidget.

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                      • VRoninV Offline
                        VRoninV Offline
                        VRonin
                        wrote on last edited by VRonin
                        #12

                        ok, delete your label, lineedit, and pushbutton. try putting in your constructor

                        ui->listwidget->model()->insertRows(0,10);
                        

                        Now there should be 10 blank "labels" in your list widget, if you doubleclick on them a lineedit appears to let you change it and when you move away it goes back into "label mode". All 100% already managed by QListWidget. Is this what you were looking for?

                        Actually the goal we must to do is adding and updating contacts in contacts listwidget.

                        To add a new line you have 2 options:

                        • a button that adds a new line
                        • a system that creates a "ghost line" at the end that, when edited will become a real line (more or less like MS Access lets you change tables)

                        "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

                        1 Reply Last reply
                        4
                        • D Offline
                          D Offline
                          Dimple
                          wrote on last edited by Dimple
                          #13

                          suppose if i type 1 it shows on qlistwidget ,,
                          next i ll type 2 then on QListWidget shows in order one by one
                          ex: 1
                          2

                          when i type then only it should display in order one by one ,,this is i wanted ???

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                          0
                          • VRoninV Offline
                            VRoninV Offline
                            VRonin
                            wrote on last edited by
                            #14

                            I'm not sure I understand the question, sorry...

                            "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

                            JonBJ 1 Reply Last reply
                            1
                            • VRoninV VRonin

                              I'm not sure I understand the question, sorry...

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

                              @VRonin
                              There's some sort of "history" mechanism going on here. The user types something somewhere, it is to be added to this list as the first item. User then types something again, this gets added as the next item in the list.... :)

                              So to the OP, @Dimple: you need to write code so that after each text entered in the line edit it should insert/append one additional row, setting that row's text from the line edit.

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                              • D Offline
                                D Offline
                                Dimple
                                wrote on last edited by
                                #16

                                @VRonin : its ok

                                @JonB : thanks for ur reply ,,im a fresher ,,,can u please if u have a code share with me ??

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                                • SGaistS Offline
                                  SGaistS Offline
                                  SGaist
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #17

                                  Hi,

                                  Did you took a look at the the example code in QListWidget's documentation ? It shows how to add new items.

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

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                                  • D Offline
                                    D Offline
                                    Dimple
                                    wrote on last edited by
                                    #18

                                    @SGaist
                                    yes ,,,i added this code now whatever i text ,,,everything is adding in list in order but i want to make it whatever i text ,,that text shows first ??
                                    void MainWindow::on_add_clicked()
                                    {
                                    QString text=ui->lineEdit->text();
                                    QListWidgetItem * item = new QListWidgetItem(text);
                                    item->setFlags(item->flags() | Qt::ItemIsEditable);
                                    ui->listWidget->addItem(item);
                                    ui->lineEdit->clear();
                                    }

                                    mrjjM 1 Reply Last reply
                                    0
                                    • D Dimple

                                      @SGaist
                                      yes ,,,i added this code now whatever i text ,,,everything is adding in list in order but i want to make it whatever i text ,,that text shows first ??
                                      void MainWindow::on_add_clicked()
                                      {
                                      QString text=ui->lineEdit->text();
                                      QListWidgetItem * item = new QListWidgetItem(text);
                                      item->setFlags(item->flags() | Qt::ItemIsEditable);
                                      ui->listWidget->addItem(item);
                                      ui->lineEdit->clear();
                                      }

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

                                      @Dimple
                                      Hi
                                      There are in the order you addItem them.
                                      However, there is also
                                      http://doc.qt.io/qt-5/qlistwidget.html#insertItem
                                      which allows you to insert at any row you want and hence put on top if you wish.

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                                      • D Offline
                                        D Offline
                                        Dimple
                                        wrote on last edited by
                                        #20

                                        @mrjj thanks for ur reply & thank u all ,,,
                                        i changed two lines of code,,,now whatever i text ,,that is showing first ,,,this is i wanted anyway thanku all for ur reply ,,i got output wat i wanted!

                                        Mainwindow.cpp

                                        #include "mainwindow.h"
                                        #include "ui_mainwindow.h"

                                        MainWindow::MainWindow(QWidget *parent) :
                                        QMainWindow(parent),
                                        ui(new Ui::MainWindow)
                                        {
                                        ui->setupUi(this);
                                        }

                                        MainWindow::~MainWindow()
                                        {
                                        delete ui;
                                        }

                                        void MainWindow::on_add_clicked()
                                        {

                                        QString text=ui->lineEdit->text();
                                        QListWidgetItem * item = new QListWidgetItem(text);
                                        item->setFlags(item->flags() | Qt::ItemIsEditable);
                                        int row = ui->listWidget->row(ui->listWidget->currentItem());
                                        
                                        ui->listWidget->insertItem(row, item);
                                        
                                        
                                         ui->lineEdit->clear();
                                        

                                        }

                                        void MainWindow::on_delete_2_clicked()
                                        {
                                        delete ui->listWidget->currentItem();
                                        }

                                        Ui Page

                                        0_1547799303419_111.PNG

                                        1 Reply Last reply
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