Text box and list box connectivity

**Rekha** · 25th July 2006, 06:14

hi,
i'm beginner to Qt.. there is a text box and list box,when u enter some characters in the text box and give enter to a push button,it should add all the characters to listbox.. so i had written code 4 tat,everything works fine,but adding characters to listbox is not wrkg fine.. the code for adding characters is given below,
pls check wats wrong with code

Qt Code:

Switch view

void show()
   { 
      QTextLength str1;
      QTextStream str,str2;
      str=text1.text();
      str1=length(str);  
 
      for(int i=0;i<str1;i++)
       {
 
           str2=insertText(list1.at(i));
             i++; 
       }
       display->setText(display->text()+str2);      
    }

void show()
   { 
      QTextLength str1;
      QTextStream str,str2;
      str=text1.text();
      str1=length(str);  
      
      for(int i=0;i<str1;i++)
       {
 
           str2=insertText(list1.at(i));
             i++; 
       }
       display->setText(display->text()+str2);      
    }

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**munna** · 25th July 2006, 06:28

Please use the code tag to insert your code.

Originally Posted by Rekha

there is a text box and list box,when u enter some characters in the text box and give enter to a push button,it should add all the characters to listbox..

How should the characters be added to the list box ? Should each character become an item in the listbox or each word becomes an item or each line should be an item in the list box ?

Qt Code:

Switch view

void show()
{
QTextLength str1;
QTextStream str,str2;
str=text1.text();
str1=length(str);
 
for(int i=0;i<str1;i++)
{
 
str2=insertText(list1.at(i));
i++;
}
display->setText(display->text()+str2);
}

void show()
{
QTextLength str1;
QTextStream str,str2;
str=text1.text();
str1=length(str);

for(int i=0;i<str1;i++)
{

str2=insertText(list1.at(i));
i++;
}
display->setText(display->text()+str2);
}

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What is list1 and display ?

**Rekha** · 25th July 2006, 06:37

oh sorry,
text1 is the name of text box widget
list1 is the name of the listWidget name
display is the function used to display
the complete text thats there in text box text1 should come to the list box, it can come as a block or else word by word or character by character

**munna** · 25th July 2006, 06:42

try this

Qt Code:

Switch view

void show()
{
      list1.addItem(text1.toPlainText());
}

void show()
{
      list1.addItem(text1.toPlainText());
}

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**Rekha** · 25th July 2006, 06:52

no its not wkg..
i will add code what i had written again 4m starting
/////////////////code/////////////////

Qt Code:

Switch view

class Ui_Dialog
{
public:
    QWidget *layoutWidget;
    QHBoxLayout *hboxLayout;
    QPushButton *exit;
    QTextEdit *text2;
    QListWidget *list1;
    QTextEdit *text1;
    QPushButton *enter;
 
    void setupUi(QDialog *Dialog)
    {
    Dialog->setObjectName(QString::fromUtf8("Dialog"));
    Dialog->resize(QSize(552, 555).expandedTo(Dialog->minimumSizeHint()));
    layoutWidget = new QWidget(Dialog);
    layoutWidget->setObjectName(QString::fromUtf8("layoutWidget"));
    layoutWidget->setGeometry(QRect(20, 430, 351, 38));
    hboxLayout = new QHBoxLayout(layoutWidget);
    hboxLayout->setSpacing(6);
    hboxLayout->setMargin(0);
    hboxLayout->setObjectName(QString::fromUtf8("hboxLayout"));
    exit = new QPushButton(layoutWidget);
    exit->setObjectName(QString::fromUtf8("exit"));
 
    hboxLayout->addWidget(exit);
 
    text2 = new QTextEdit(Dialog);
    text2->setObjectName(QString::fromUtf8("text2"));
    text2->setGeometry(QRect(60, 220, 104, 52));
    list1 = new QListWidget(Dialog);
    list1->setObjectName(QString::fromUtf8("list1"));
    list1->setGeometry(QRect(380, 90, 120, 80));
    text1 = new QTextEdit(Dialog);
    text1->setObjectName(QString::fromUtf8("text1"));
    text1->setGeometry(QRect(60, 80, 104, 52));
    enter = new QPushButton(Dialog);
    enter->setObjectName(QString::fromUtf8("enter"));
    enter->setGeometry(QRect(210, 90, 108, 36));
    QWidget::setTabOrder(text1, enter);
    QWidget::setTabOrder(enter, list1);
    QWidget::setTabOrder(list1, text2);
    QWidget::setTabOrder(text2, exit);
    retranslateUi(Dialog);
    QObject::connect(exit, SIGNAL(clicked()), Dialog, SLOT(reject()));
    QObject::connect(enter, SIGNAL(clicked()), list1, SLOT(show()));
    QObject::connect(list1, SIGNAL(itemDoubleClicked(QListWidgetItem*)), text2, SLOT(copy()));
 
    QMetaObject::connectSlotsByName(Dialog);
    } // setupUi
 
    void retranslateUi(QDialog *Dialog)
    {
    Dialog->setWindowTitle(QApplication::translate("Dialog", "Dialog", 0, QApplication::UnicodeUTF8));
    exit->setText(QApplication::translate("Dialog", "Exit", 0, QApplication::UnicodeUTF8));
    enter->setText(QApplication::translate("Dialog", "Enter", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(Dialog);
    } // retranslateUi
 
    void show()
   { 
      QTextLength str1;
      QTextStream str,str2;
      str=text1.text();
      str1=length(str);
      list1.addItem(text1.toPlainText());
      for(int i=0;i<str1;i++)
       {
 
           str2=insertText(list1.at(i));
 
             i++; 
       }
       display->setText(display->text()+str2);      
    }
 
 
};

class Ui_Dialog
{
public:
    QWidget *layoutWidget;
    QHBoxLayout *hboxLayout;
    QPushButton *exit;
    QTextEdit *text2;
    QListWidget *list1;
    QTextEdit *text1;
    QPushButton *enter;

    void setupUi(QDialog *Dialog)
    {
    Dialog->setObjectName(QString::fromUtf8("Dialog"));
    Dialog->resize(QSize(552, 555).expandedTo(Dialog->minimumSizeHint()));
    layoutWidget = new QWidget(Dialog);
    layoutWidget->setObjectName(QString::fromUtf8("layoutWidget"));
    layoutWidget->setGeometry(QRect(20, 430, 351, 38));
    hboxLayout = new QHBoxLayout(layoutWidget);
    hboxLayout->setSpacing(6);
    hboxLayout->setMargin(0);
    hboxLayout->setObjectName(QString::fromUtf8("hboxLayout"));
    exit = new QPushButton(layoutWidget);
    exit->setObjectName(QString::fromUtf8("exit"));

    hboxLayout->addWidget(exit);

    text2 = new QTextEdit(Dialog);
    text2->setObjectName(QString::fromUtf8("text2"));
    text2->setGeometry(QRect(60, 220, 104, 52));
    list1 = new QListWidget(Dialog);
    list1->setObjectName(QString::fromUtf8("list1"));
    list1->setGeometry(QRect(380, 90, 120, 80));
    text1 = new QTextEdit(Dialog);
    text1->setObjectName(QString::fromUtf8("text1"));
    text1->setGeometry(QRect(60, 80, 104, 52));
    enter = new QPushButton(Dialog);
    enter->setObjectName(QString::fromUtf8("enter"));
    enter->setGeometry(QRect(210, 90, 108, 36));
    QWidget::setTabOrder(text1, enter);
    QWidget::setTabOrder(enter, list1);
    QWidget::setTabOrder(list1, text2);
    QWidget::setTabOrder(text2, exit);
    retranslateUi(Dialog);
    QObject::connect(exit, SIGNAL(clicked()), Dialog, SLOT(reject()));
    QObject::connect(enter, SIGNAL(clicked()), list1, SLOT(show()));
    QObject::connect(list1, SIGNAL(itemDoubleClicked(QListWidgetItem*)), text2, SLOT(copy()));
    
    QMetaObject::connectSlotsByName(Dialog);
    } // setupUi

    void retranslateUi(QDialog *Dialog)
    {
    Dialog->setWindowTitle(QApplication::translate("Dialog", "Dialog", 0, QApplication::UnicodeUTF8));
    exit->setText(QApplication::translate("Dialog", "Exit", 0, QApplication::UnicodeUTF8));
    enter->setText(QApplication::translate("Dialog", "Enter", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(Dialog);
    } // retranslateUi
   
    void show()
   { 
      QTextLength str1;
      QTextStream str,str2;
      str=text1.text();
      str1=length(str);
      list1.addItem(text1.toPlainText());
      for(int i=0;i<str1;i++)
       {
 
           str2=insertText(list1.at(i));
            
             i++; 
       }
       display->setText(display->text()+str2);      
    }


};

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The problem is in void show() ;

**munna** · 25th July 2006, 06:59

change

QObject::connect(enter, SIGNAL(clicked()), list1, SLOT(show()));

to

QObject::connect(enter, SIGNAL(clicked()), Dialog, SLOT(show()));

**Rekha** · 25th July 2006, 07:07

its not working

**munna** · 25th July 2006, 07:37

QObject::connect(enter, SIGNAL(clicked()), Dialog, SLOT(show()));

sender - enter
signal - clicked()
receiver - Dialog
slot - show()

receiver tells the program where the slot is. Therefore the slot show() should be in the class Dialog and not in the Ui_Dialog.

Sorry, my mistake. I did not see the slot in that big code.

Please insert you code between the code tag.

**Rekha** · 25th July 2006, 07:46

at the end of code i had used namespace so its" Dialog class" only..

**munna** · 25th July 2006, 07:52

In that case it should be

QObject::connect(enter, SIGNAL(clicked()), this, SLOT(show()));

and proabably u'll need to add "public slots:" before the slot show(), if you have not added.

**Rekha** · 25th July 2006, 09:08

sorry to say but even that dint work.. can u guess what might be the problem

**munna** · 25th July 2006, 09:58

Can you please zip your code and attach here ?

**jacek** · 25th July 2006, 10:21

Ui_Dialog class doesn't inherit QObject, thus it can't have slots.

It looks like you are trying to modify a file produced by uic. You should use the single- or multi-inheritance approach instead, to avoid problems when you will have to generate it again. See Qt Designer docs.

**Rekha** · 25th July 2006, 10:25

i have zipped the sample.h file as u had asked..i have attached sample.cpp also along with that

**munna** · 25th July 2006, 10:38

ok here it is

Qt Code:

Switch view

class Ui_Dialog : public QObject
{
	Q_OBJECT
 
public:
    QWidget *layoutWidget;
    QHBoxLayout *hboxLayout;
    QPushButton *exit;
    QTextEdit *text2;
    QListWidget *list1;
    QPushButton *enter;
    QTextEdit *text1;
 
    void setupUi(QDialog *Dialog)
    {
    Dialog->setObjectName(QString::fromUtf8("Dialog"));
    Dialog->resize(QSize(552, 555).expandedTo(Dialog->minimumSizeHint()));
    layoutWidget = new QWidget(Dialog);
    layoutWidget->setObjectName(QString::fromUtf8("layoutWidget"));
    layoutWidget->setGeometry(QRect(230, 410, 131, 38));
    hboxLayout = new QHBoxLayout(layoutWidget);
    hboxLayout->setSpacing(6);
    hboxLayout->setMargin(0);
    hboxLayout->setObjectName(QString::fromUtf8("hboxLayout"));
    exit = new QPushButton(layoutWidget);
    exit->setObjectName(QString::fromUtf8("exit"));
 
    hboxLayout->addWidget(exit);
 
    text2 = new QTextEdit(Dialog);
    text2->setObjectName(QString::fromUtf8("text2"));
    text2->setGeometry(QRect(60, 220, 104, 52));
    list1 = new QListWidget(Dialog);
    list1->setObjectName(QString::fromUtf8("list1"));
    list1->setGeometry(QRect(380, 90, 120, 80));
    enter = new QPushButton(Dialog);
    enter->setObjectName(QString::fromUtf8("enter"));
    enter->setGeometry(QRect(210, 90, 108, 36));
    text1 = new QTextEdit(Dialog);
    text1->setObjectName(QString::fromUtf8("text1"));
    text1->setGeometry(QRect(60, 80, 104, 52));
    QWidget::setTabOrder(text1, enter);
    QWidget::setTabOrder(enter, list1);
    QWidget::setTabOrder(list1, text2);
    QWidget::setTabOrder(text2, exit);
    retranslateUi(Dialog);
    QObject::connect(exit, SIGNAL(clicked()), this, SLOT(reject()));
    QObject::connect(enter, SIGNAL(clicked()), this, SLOT(show()));
    QObject::connect(list1, SIGNAL(itemDoubleClicked(QListWidgetItem*)), this, SLOT(copy()));
    QObject::connect(text1, SIGNAL(textChanged()), this, SLOT(update()));
 
    QMetaObject::connectSlotsByName(Dialog);
    } // setupUi
 
    void retranslateUi(QDialog *Dialog)
    {
    Dialog->setWindowTitle(QApplication::translate("Dialog", "Dialog", 0, QApplication::UnicodeUTF8));
    exit->setText(QApplication::translate("Dialog", "Exit", 0, QApplication::UnicodeUTF8));
    enter->setText(QApplication::translate("Dialog", "Enter", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(Dialog);
    } // retranslateUi
 
public slots:
 
	void show()
	{
		list1->addItem(text1->toPlainText());
	}
 
 
};

class Ui_Dialog : public QObject
{
	Q_OBJECT

public:
    QWidget *layoutWidget;
    QHBoxLayout *hboxLayout;
    QPushButton *exit;
    QTextEdit *text2;
    QListWidget *list1;
    QPushButton *enter;
    QTextEdit *text1;

    void setupUi(QDialog *Dialog)
    {
    Dialog->setObjectName(QString::fromUtf8("Dialog"));
    Dialog->resize(QSize(552, 555).expandedTo(Dialog->minimumSizeHint()));
    layoutWidget = new QWidget(Dialog);
    layoutWidget->setObjectName(QString::fromUtf8("layoutWidget"));
    layoutWidget->setGeometry(QRect(230, 410, 131, 38));
    hboxLayout = new QHBoxLayout(layoutWidget);
    hboxLayout->setSpacing(6);
    hboxLayout->setMargin(0);
    hboxLayout->setObjectName(QString::fromUtf8("hboxLayout"));
    exit = new QPushButton(layoutWidget);
    exit->setObjectName(QString::fromUtf8("exit"));

    hboxLayout->addWidget(exit);

    text2 = new QTextEdit(Dialog);
    text2->setObjectName(QString::fromUtf8("text2"));
    text2->setGeometry(QRect(60, 220, 104, 52));
    list1 = new QListWidget(Dialog);
    list1->setObjectName(QString::fromUtf8("list1"));
    list1->setGeometry(QRect(380, 90, 120, 80));
    enter = new QPushButton(Dialog);
    enter->setObjectName(QString::fromUtf8("enter"));
    enter->setGeometry(QRect(210, 90, 108, 36));
    text1 = new QTextEdit(Dialog);
    text1->setObjectName(QString::fromUtf8("text1"));
    text1->setGeometry(QRect(60, 80, 104, 52));
    QWidget::setTabOrder(text1, enter);
    QWidget::setTabOrder(enter, list1);
    QWidget::setTabOrder(list1, text2);
    QWidget::setTabOrder(text2, exit);
    retranslateUi(Dialog);
    QObject::connect(exit, SIGNAL(clicked()), this, SLOT(reject()));
    QObject::connect(enter, SIGNAL(clicked()), this, SLOT(show()));
    QObject::connect(list1, SIGNAL(itemDoubleClicked(QListWidgetItem*)), this, SLOT(copy()));
    QObject::connect(text1, SIGNAL(textChanged()), this, SLOT(update()));

    QMetaObject::connectSlotsByName(Dialog);
    } // setupUi

    void retranslateUi(QDialog *Dialog)
    {
    Dialog->setWindowTitle(QApplication::translate("Dialog", "Dialog", 0, QApplication::UnicodeUTF8));
    exit->setText(QApplication::translate("Dialog", "Exit", 0, QApplication::UnicodeUTF8));
    enter->setText(QApplication::translate("Dialog", "Enter", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(Dialog);
    } // retranslateUi

public slots:

	void show()
	{
		list1->addItem(text1->toPlainText());
	}


};

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But I would not suggest you to do this way. Please look into Qt examples as on how the classes are designed.

**Rekha** · 25th July 2006, 12:32

its not working .. please say me
1)the code to copy all the characters from the text box to list box when a push button like enter is being clicked after entering all the characters in the text box....... is not working

**munna** · 25th July 2006, 12:39

I have tested this and it works perfectly for me. When I click on the enter button the text gets copied to the list1.

Ofcourse u'll need to add

#include<QObject> in the beginning

and

namespace Ui {
class Dialog: public Ui_Dialog {};
} // namespace Ui

at the end

**Rekha** · 28th July 2006, 10:08

on executing "make" command i'm getting the follwoing errors..
wat 2 do?

MyDialog.cpp: In member function `void MyDialog::copy()':
MyDialog.cpp:16: error: `addItem' undeclared (first use this function)
MyDialog.cpp:16: error: (Each undeclared identifier is reported only once for
each function it appears in.)
make: *** [MyDialog.o] Error 1

**sunil.thaha** · 28th July 2006, 12:46

Just go through this
http://qt4.digitalfanatics.org/articles/i.html

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