virtual keyboard done with qt4-designer

[madhukiranmp]

bool TME_COM::eventFilter(QObject* call_object, QEvent* pevent)
{
	QLineEdit *isQLineEdit = static_cast<QLineEdit*>(call_object);
 
	if(call_object != ui->TME_COM_ETHER1_IP1_TXTED) return false;
	qDebug("Entering if\n");
	if (pevent->type() == QEvent::FocusIn)
		{
			qDebug("entering show\n");
			virtualkeyboard->show();
			return true;
		}
else
{
	qDebug("entering hide\n");
	virtualkeyboard->hide();
	return false;
}
}

bool TME_COM::eventFilter(QObject* call_object, QEvent* pevent)
{
	QLineEdit *isQLineEdit = static_cast<QLineEdit*>(call_object);

	if(call_object != ui->TME_COM_ETHER1_IP1_TXTED) return false;
	qDebug("Entering if\n");
	if (pevent->type() == QEvent::FocusIn)
		{
			qDebug("entering show\n");
			virtualkeyboard->show();
			return true;
		}
else
{
	qDebug("entering hide\n");
	virtualkeyboard->hide();
	return false;
}
}

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Yes, Of-course I've called installEventFilter() for the line edits.
"Not working" I mean if I click on line edit VKB is not displaying.
So as you told I put some Debug statements and tried, actually when I open the screen itself it's entering this event filter function. The program is not waiting till I click on lline edit. As soon as I open the TME_COM screen it's entering the event filter function. But I don't want that, whenever I click on line edit it should enter the event filter function.

In the output It's printing following Debug statements

Entering if
Entering hide
Entering if
Entering hide

and I'm getting one warning," unused variable isQlineEdit". What should I do to display the VKB for click on line edit?

[high_flyer]

The program is not waiting till I click on lline edit. As soon as I open the TME_COM screen it's entering the event filter function. But I don't want that, whenever I click on line edit it should enter the event filter function.

That is a correct behaviour.
An event filter gets all the events for the filtered widget.
In the function it self, as you are doing, you should filter out the event you want to handle.
So that is ok.

The warning you get tells you what the problem is - you have defined 'isQlineEdit' but you don't use it.
Just delete that line and the warning will go away.

Try 'QEvent::EnterEditFocus' instead of 'QEvent::FocusIn'

Yes, Of-course I've called installEventFilter() for the line edits.

Well, nothing is 'of course' when you try to debug code you can't see

[madhukiranmp]

I tried with 'QEvent::EnterEditFocus', with this also VKB is not displaying, actually it's saying "EnterEditfocus is not a member of QEvent ".
Is there any function other than eventFilter(), so that I can use here. Because, I don't want to show the keyboard as soon as the screen opens. Instead, I want to display the VKB only when clicked on line edit.

[high_flyer]

"EnterEditfocus is not a member of QEvent ".

It should be EnterEditFocus, with a 'F'.

In such cases check the QEvent documentation.

s there any function other than eventFilter(), so that I can use here.

You can subclass QLineEdit and overload focusInEvent().
But then your QLineEdit will have to get a pointer to the VKB, or otherwise have access to it.

Don't expect to be fed everything with a spoon - read the docs!
Look for answers in the docs!

[madhukiranmp]

Okay, I'll try with that. Thank you.

[madhukiranmp]

Hi. I got it worked with following, using signals and slots

connect(qApp, SIGNAL(focusChanged(QWidget*, QWidget*)), this, SLOT(setWidgets(QWidget*, QWidget*)));
 
void  TME_COM::setWidgets(QWidget *old, QWidget *newwid)
{
    const char* ab;
	if(newwid != 0)
    {
		ab = newwid->metaObject()->className();
		if(strcmp(ab,"QLineEdit")==0)
		{
			virtualKeyBoard->show();
		}
	}
 
	else
	{
		virtualKeyBoard->hide();
	}
}

connect(qApp, SIGNAL(focusChanged(QWidget*, QWidget*)), this, SLOT(setWidgets(QWidget*, QWidget*)));

void  TME_COM::setWidgets(QWidget *old, QWidget *newwid)
{
    const char* ab;
	if(newwid != 0)
    {
		ab = newwid->metaObject()->className();
		if(strcmp(ab,"QLineEdit")==0)
		{
			virtualKeyBoard->show();
		}
	}

	else
	{
		virtualKeyBoard->hide();
	}
}

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Thanks for your replies.
I've got one more issue.
The screens in our project resizes when double clicked on title bar. I want to disable this resize option.
so the questions are,
1. How to disable the resize of the screens or widget on double click of the title bar?
2. How to disable the context menu display, when right clciked on title bar?

[high_flyer]

Hi. I got it worked with following, using signals and slots

I was not aware the trolls added a signal for that, its hard to keep up with all the new features! (All though I see its a 4.1 feature (but I didn't need it))
Well, I learned something new too!

1. How to disable the resize of the screens or widget on double click of the title bar?

I don't know if Qt has something "ready" to be used for that.
You might need to catch the resize event for the window and re implement it.

2. How to disable the context menu display, when right clciked on title bar?

See WindowFlags.

[madhukiranmp]

Hi all,
I have created a simple application with a single combo box and some push buttons. This is to implement multilingual feature of Qt. I want to dynamically update the combo box if any new .qm file is added to the project folder. I'm getting the file name added to the combo box. But once I select the dynamically added item in the combo box the language changes and the corresponding new item disappears. I want it to be added permanently. please help how to do this.
Thanks in advance.

here is the code I've used

#include "detect.h"
#include "ui_detect.h"
#include "QFileSystemWatcher"
#include "QFileInfo"
#include "QTranslator"
#include "QTextStream"
#include "QString"
#include "QComboBox"
 
QTranslator langTranslator;
QString line1;
detect::detect(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::detect)
{
    ui->setupUi(this);
    qApp->installTranslator(&langTranslator);
    system("ls ..\ >new.txt");
    system("comm -13 old.txt new.txt >difference.txt");
    readdifference();
 
}
 
detect::~detect()
{
    delete ui;
}
 
void detect::changeEvent(QEvent *e)
{
    QDialog::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}
 
void detect::on_comboBox_activated(const QString & text)
{
    if(text == tr("French"))
    {
        langTranslator.load("arrowpad_fr","C:/Documents and Settings/20010833/Desktop/testdet" );
    }
    else if(text == line1)
    {
        langTranslator.load(line1,"C:/Documents and Settings/20010833/Desktop/testdet" );
    }
 
}
void detect::readdifference()
{
    QString path="C:/Documents and Settings/20010833/Desktop/testdet";
    QFile nfile("difference.txt");
 
    if(!nfile.open(QIODevice::ReadOnly ))
        return;
    QTextStream in(& nfile);
    while(!in.atEnd())
    {
        line1=in.readLine();
        if(line1.endsWith("qm"))
        {
 
            ui->comboBox->addItem(line1,QVariant::Char);
            // break;
        }
    }
}

#include "detect.h"
#include "ui_detect.h"
#include "QFileSystemWatcher"
#include "QFileInfo"
#include "QTranslator"
#include "QTextStream"
#include "QString"
#include "QComboBox"

QTranslator langTranslator;
QString line1;
detect::detect(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::detect)
{
    ui->setupUi(this);
    qApp->installTranslator(&langTranslator);
    system("ls ..\ >new.txt");
    system("comm -13 old.txt new.txt >difference.txt");
    readdifference();

}

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

void detect::changeEvent(QEvent *e)
{
    QDialog::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

void detect::on_comboBox_activated(const QString & text)
{
    if(text == tr("French"))
    {
        langTranslator.load("arrowpad_fr","C:/Documents and Settings/20010833/Desktop/testdet" );
    }
    else if(text == line1)
    {
        langTranslator.load(line1,"C:/Documents and Settings/20010833/Desktop/testdet" );
    }

}
void detect::readdifference()
{
    QString path="C:/Documents and Settings/20010833/Desktop/testdet";
    QFile nfile("difference.txt");

    if(!nfile.open(QIODevice::ReadOnly ))
        return;
    QTextStream in(& nfile);
    while(!in.atEnd())
    {
        line1=in.readLine();
        if(line1.endsWith("qm"))
        {

            ui->comboBox->addItem(line1,QVariant::Char);
            // break;
        }
    }
}

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