[SOLVED] changing image using keypress

[sasireka]

hi all,
Good day. I want to change the image using keypress. If i am pressing F2, in screen i have to show first image. Again pressing F2 second time in screen have to show next image. please give me some idea to do it.

Thanks & Regards
Sasi

[Francknos]

Hi try this:

@
void MyClass::keyPressEvent(QKeyEvent *e)
{
switch ( e->key() )
{
case Qt::Key_F2 :
MAKES YOUR CHANGE
break;
}
}
@

[sasireka]

[quote author="Francknos" date="1412059137"]Hi try this:

@
void MyClass::keyPressEvent(QKeyEvent *e)
{
switch ( e->key() )
{
case Qt::Key_F2 :
MAKES YOUR CHANGE
break;
}
}
@[/quote]

yes i added but not showing anything. and my code is below

dialog.h
@#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QMovie>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
Q_OBJECT

public:
explicit Dialog(QWidget *parent = 0);
~Dialog();

protected:
void keyPressEvent(QKeyEvent *e);

private:
Ui::Dialog *ui;

};

#endif // DIALOG_H@

dialog.cpp

@#include "dialog.h"
#include "ui_dialog.h"
#include <QMovie>
#include <QImage>
#include <QFontDatabase>
#include <QDebug>
#include <QKeyEvent>

Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
ui->setupUi(this);

}

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

void Dialog::keyPressEvent(QKeyEvent *e)
{
switch ( e->key() )
{
case Qt::Key_F2 :
QMovie *movie = new QMovie("/home/dev6/Desktop/animation/spectrum.gif");
QLabel *processLabel = new QLabel(this);
processLabel->setMovie(movie);
movie->start();
break;
}
}@

[Francknos]

Try to have your QMovie in private membre of your class and construt it in constructor.

but I think the function keyPressEvent works. The proble is in your QMovie.

[sasireka]

[quote author="Francknos" date="1412060594"]Try to have your QMovie in private membre of your class and construt it in constructor.

but I think the function keyPressEvent works. The proble is in your QMovie. [/quote]

yes exactly. i changed like this. now it is working fine. Thanks alot.

@void Dialog::keyPressEvent(QKeyEvent *e)
{
switch ( e->key() )
{
case Qt::Key_F2 :
QMovie *movie = new QMovie("/home/dev6/Desktop/animation/spectrum.gif");
QLabel *processLabel = new QLabel(this);
ui->processLabel->setMovie(movie);
movie->start();
break;
}
}@

[sasireka]

but if i am pressing the same key again have to show next image is it possible..

[sasireka]

This is working fine for showing the next next picture by pressing the same key.

Thanks alot to Francknos and all for your great help.

@void Dialog::keyPressEvent(QKeyEvent *e)
{

static int key_press;

if(e->key() == Qt::Key_F2)
{
    key_press++;
}

if(key_press == 1)
    {
            QMovie *movie = new QMovie("/home/dev6/Desktop/animation/spectrum.gif");
            QLabel *processLabel = new QLabel(this);
            ui->processLabel->setMovie(movie);
            movie->start();

            ui->label1->setText(QString::fromUtf8("chennai  சென்னை"));
            ui->label1->show();
    }

 if(key_press == 2)
    {
            QMovie *movie = new QMovie("/home/dev6/Desktop/animation/1.gif");
            QLabel *processLabel = new QLabel(this);
            ui->processLabel->setMovie(movie);
            movie->start();

            ui->label1->setText(QString::fromUtf8("சென்னை Namakkal"));
            ui->label1->show();
    }
 if(key_press == 3)
    {
            QMovie *movie = new QMovie("/home/dev6/Desktop/animation/2.gif");
            QLabel *processLabel = new QLabel(this);
            ui->processLabel->setMovie(movie);
            movie->start();

            ui->label1->setText(QString::fromUtf8("coimbatore சென்னை"));
            ui->label1->show();
    }

}@

[IamSumit]

Hi.
Yeah it is possible.

[sasireka]

[quote author="IamSumit" date="1412069646"]Hi.
Yeah it is possible.

[/quote]

yes i done . thanks

[Francknos]

construct a QVector<QMovie> _movies;
and add it to constructor then when you press F2:

cpt++
ui->processLabel->setMovie(_movies[cpt]);
_movies[cpt]->start();

[IamSumit]

@void Dialog::keyPressEvent(QKeyEvent *e)
{

static int key_press;

if(e->key() == Qt::Key_F2)
{
    key_press++;
}

if(key_press == 1)
    {
            QMovie *movie = new QMovie("/home/dev6/Desktop/animation/spectrum.gif");
            QLabel *processLabel = new QLabel(this);
            ui->processLabel->setMovie(movie);
            movie->start();

            ui->label1->setText(QString::fromUtf8("chennai  சென்னை"));
            ui->label1->show();
    }

 if(key_press == 2)
    {
            QMovie *movie = new QMovie("/home/dev6/Desktop/animation/1.gif");
            QLabel *processLabel = new QLabel(this);
            ui->processLabel->setMovie(movie);
            movie->start();

            ui->label1->setText(QString::fromUtf8("சென்னை Namakkal"));
            ui->label1->show();
    }
 if(key_press == 3)
    {
            QMovie *movie = new QMovie("/home/dev6/Desktop/animation/2.gif");
            QLabel *processLabel = new QLabel(this);
            ui->processLabel->setMovie(movie);
            movie->start();

            ui->label1->setText(QString::fromUtf8("coimbatore சென்னை"));
            ui->label1->show();
    }

}@

hi..
this is not a right way.Because many of same instructions are repeating.

you can optimize your code .You must create a method with parameter QString path
e'g;
@
void ShowPicture(QString path)
{
QMovie *movie = new QMovie(path);
QLabel *processLabel = new QLabel(this);
ui->processLabel->setMovie(movie);
movie->start();

            ui->label1->setText(QString::fromUtf8("chennai  சென்னை"));
            ui->label1->show();

}
@
hope it helps

[sasireka]

[quote author="Francknos" date="1412070831"]construct a QVector<QMovie> _movies;
and add it to constructor then when you press F2:

cpt++
ui->processLabel->setMovie(_movies[cpt]);
_movies[cpt]->start();
[/quote]

okay i will try in this way...

[sasireka]

[quote author="IamSumit" date="1412074165"]

hi..
this is not a right way.Because many of same instructions are repeating.

you can optimize your code .You must create a method with parameter QString path
e'g;
@
void ShowPicture(QString path)
{
QMovie *movie = new QMovie(path);
QLabel *processLabel = new QLabel(this);
ui->processLabel->setMovie(movie);
movie->start();

            ui->label1->setText(QString::fromUtf8("chennai  சென்னை"));
            ui->label1->show();

}
@
hope it helps[/quote]

okay. How to call this function and where to call it.

[sasireka]

i used like this getting error

/home/dev6/Desktop/animation-build-desktop-Qt_4_8_1_in_PATH__System__Release/../animation/dialog.cpp:53: error: a function-definition is not allowed here before '{' token

/home/dev6/Desktop/animation-build-desktop-Qt_4_8_1_in_PATH__System__Release/../animation/dialog.cpp:69: error: 'ShowPicture' was not declared in this scope

@void Dialog::keyPressEvent(QKeyEvent *e)
{

void ShowPicture(QString path)
{
                QMovie *movie = new QMovie(path);
                QLabel *processLabel = new QLabel(this);
                ui->processLabel->setMovie(movie);
                movie->start();

                ui->label1->setText(QString::fromUtf8("chennai  சென்னை"));
                ui->label1->show();
}

static int key_press = 0;

if(e->key() == Qt::Key_F3)
{

   // QString path = "/home/dev6/Desktop/animation/3.gif";
    ShowPicture("/home/dev6/Desktop/animation/3.gif");
    
}@

[IamSumit]

[quote author="sasireka" date="1412078116"]i used like this getting error

/home/dev6/Desktop/animation-build-desktop-Qt_4_8_1_in_PATH__System__Release/../animation/dialog.cpp:53: error: a function-definition is not allowed here before '{' token

/home/dev6/Desktop/animation-build-desktop-Qt_4_8_1_in_PATH__System__Release/../animation/dialog.cpp:69: error: 'ShowPicture' was not declared in this scope

@void Dialog::keyPressEvent(QKeyEvent *e)
{

void ShowPicture(QString path)
{
                QMovie *movie = new QMovie(path);
                QLabel *processLabel = new QLabel(this);
                ui->processLabel->setMovie(movie);
                movie->start();

                ui->label1->setText(QString::fromUtf8("chennai  சென்னை"));
                ui->label1->show();
}

static int key_press = 0;

if(e->key() == Qt::Key_F3)
{

   // QString path = "/home/dev6/Desktop/animation/3.gif";
    ShowPicture("/home/dev6/Desktop/animation/3.gif");
    
}@[/quote]

hi..
After looking your code ...i think you are new to programming.are you?
you are defining the method inside another method .this is not the correct
way
just call ShowPicture("/home/dev6/Desktop/animation/2.gif");
then you will not face any error.
hope it helps

[sasireka]

[quote author="IamSumit" date="1412079562"][quote author="sasireka" date="1412078116"]i used like this getting error

/home/dev6/Desktop/animation-build-desktop-Qt_4_8_1_in_PATH__System__Release/../animation/dialog.cpp:53: error: a function-definition is not allowed here before '{' token

/home/dev6/Desktop/animation-build-desktop-Qt_4_8_1_in_PATH__System__Release/../animation/dialog.cpp:69: error: 'ShowPicture' was not declared in this scope

@void Dialog::keyPressEvent(QKeyEvent *e)
{

void ShowPicture(QString path)
{
                QMovie *movie = new QMovie(path);
                QLabel *processLabel = new QLabel(this);
                ui->processLabel->setMovie(movie);
                movie->start();

                ui->label1->setText(QString::fromUtf8("chennai  சென்னை"));
                ui->label1->show();
}

static int key_press = 0;

if(e->key() == Qt::Key_F3)
{

   // QString path = "/home/dev6/Desktop/animation/3.gif";
    ShowPicture("/home/dev6/Desktop/animation/3.gif");
    
}@[/quote]

hi..
After looking your code ...i think you are new to programming.are you?
you are defining the method inside another method .this is not the correct
way
just call ShowPicture("/home/dev6/Desktop/animation/2.gif");
then you will not face any error.
hope it helps[/quote]

good day. yes i am new to Qt programming. Okay i will do like this. Thanks Sumit. Give me a guide to learn Qt programming and library usage.

[sasireka]

bq. hi..
After looking your code ...i think you are new to programming.are you?
you are defining the method inside another method .this is not the correct
way
just call ShowPicture("/home/dev6/Desktop/animation/2.gif");
then you will not face any error.
hope it helps[/quote]bq.

i did like below. but getting errors.

@void ShowPicture(QString path)
{
QMovie *movie = new QMovie(path);
QLabel *processLabel = new QLabel(this);
ui->processLabel->setMovie(movie);
movie->start();

            ui->label1->setText(QString::fromUtf8("chennai  சென்னை"));
            ui->label1->show();

}

void Dialog::keyPressEvent(QKeyEvent *e)
{

if(e->key() == Qt::Key_F3)
{
        ShowPicture(”/home/dev6/Desktop/animation/2.gif”);
}

}@

[IamSumit]

Hi .
Can you show me your full code (including .h)?
and tell me what errors you are getting also?

[sasireka]

[quote author="IamSumit" date="1412144476"]Hi .
Can you show me your full code (including .h)?
and tell me what errors you are getting also?

[/quote]

@#include "dialog.h"
#include "ui_dialog.h"
#include <QMovie>
#include <QImage>
#include <QFontDatabase>
#include <QDebug>
#include <QKeyEvent>

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

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

void ShowPicture(QString path)
{
QMovie *movie = new QMovie(path);
QLabel *processLabel = new QLabel(this);
ui->processLabel->setMovie(movie);
movie->start();

            ui->label1->setText(QString::fromUtf8("chennai  சென்னை"));
            ui->label1->show();

}

void Dialog::keyPressEvent(QKeyEvent *e)
{

if(e->key() == Qt::Key_F3)
{
        ShowPicture(”/home/dev6/Desktop/animation/2.gif”);
}

}@

[IamSumit]

ok.
ShowPicture(QString) is the member function/method of Dialog class.
i can't see proper definition of this method.
in line 21.
@
Replace void Dialog::ShowPicture(QString path)
@

and in .h file declare this method as member.
in .h file. add this line
@
public:
void ShowPicture(QString path);
@

and your oops basics are not clear.So, Please improve your basics first.

Hope it helps.