Qt images example

[flogh]

Will someone please be so kind to post the full source code for this situation.
SUppose I have this situation.

I have 3 images that are bigger then the screen and two buttons at the end of them.
(the images are bigger then the screens display)

How can I show them on the phone screen ,I was thinking of using the QScrollarea but can't make it work .(note that I don't want a scroll bar for every image but a scroll bar that will scroll through all the images and buttons .

Thank you.

[wysota]

You don't know how you want to display an image and you want us to provide a complete source code of that? So... basically you want us to write your program for you, with algorithm and everything, correct? Do you also want us to build it and deploy it on your phone or will providing the source code be enough to satisfy you?

[flogh]

I was expecting this answer . I tried to ask a more precise question but didn't get an answer,oh well this is my source code :
How can I get all the data to fit the screen or add a scroolbar to all the grid .


header

#ifndef Chestionar_H
#define Chestionar_H
 
#include <QWidget>
#include <QListWidgetItem>
#include <QListWidget>
#include <QLabel>
 
 
QT_BEGIN_NAMESPACE
class QGroupBox;
class QPushButton;
class QTextEdit;
QT_END_NAMESPACE
 
 
 
class Chestionar : public QWidget
{
    Q_OBJECT
public slots:
        void listItemClicked();
public:
    Chestionar(QWidget *parent = 0);
 
    void setWindowFlags(Qt::WindowFlags flags);
 
 
private:
    QGroupBox *createFirstExclusiveGroup();
    QGroupBox *createNonExclusiveGroup();
    QGroupBox *groupBox2;
    QTextEdit *textEdit;
    QLabel *topLevelLabel;
    QPushButton *closeButton;
    QPushButton *closeButton2;
    QListWidget *list;
 
};
 
#endif

#ifndef Chestionar_H
#define Chestionar_H

#include <QWidget>
#include <QListWidgetItem>
#include <QListWidget>
#include <QLabel>


QT_BEGIN_NAMESPACE
class QGroupBox;
class QPushButton;
class QTextEdit;
QT_END_NAMESPACE



class Chestionar : public QWidget
{
    Q_OBJECT
public slots:
        void listItemClicked();
public:
    Chestionar(QWidget *parent = 0);

    void setWindowFlags(Qt::WindowFlags flags);


private:
    QGroupBox *createFirstExclusiveGroup();
    QGroupBox *createNonExclusiveGroup();
    QGroupBox *groupBox2;
    QTextEdit *textEdit;
    QLabel *topLevelLabel;
    QPushButton *closeButton;
    QPushButton *closeButton2;
    QListWidget *list;

};

#endif

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#include <QtGui>
#include "chestionar.h"
 
 
Chestionar::Chestionar(QWidget *parent)
    : QWidget(parent)
{
    nr_rand = 0;
    variante_rasp = 0;
    lines = new QStringList;
    raspuns_corect ="Da";
    setAttribute(Qt::WA_DeleteOnClose);
    rg = 0;
    //scrollArea->setBackgroundRole(QPalette::Dark);
    QGridLayout  *grid = new QGridLayout(this);
    //  scrollArea->setsetLayout(grid);
 
    qline = new QTextEdit("dadasaasdsadadadsasdadsadassdadasda");
    qline->setReadOnly(true);
    //  grid->addWidget(qline,0,0);
 
    ///aa
 
    ///aa
 
    QScrollArea *scroll=new QScrollArea();
 
    scroll->setWidget(qline);
    //scroll->sets
    scroll->setAlignment(Qt::AlignLeft);
    //  scroll->setWidgetResizable(true);
    //scroll->widget()->resize();
    //  scroll->setBackgroundRole(QPalette::Dark);// set background of scroll Area
    //qline->updateGeometry();
    grid->addWidget(scroll,0,0);
    //////////////////////////
 
 
    radio1 = new QRadioButton(tr("&Radio busssssssssxxxxxxxxxxxxxxxxxxxxxxxxxtssssssssssssssssssssssssssssssssssssssssssssssssssston 1"));
    radio1->setMaximumWidth(10);;
    radio2 = new QRadioButton(tr("R&adio ssssssssxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxsssssssssssssssssssssssssssssssssssssssssssssssssbutton 2"));
    radio3 = new QRadioButton(tr("Ra&dio bssssxxxxxxxxxxxxxxxxxxxxxxxxxxxxxsssssssssssssssssssssssssssssssssssutton 3"));
 
    radio1->setChecked(true);
 
    grid->addWidget(radio1,1,0);
    grid->addWidget(radio2,2,0);
    grid->addWidget(radio3,3,0);
 
    QWidget *d = QApplication::desktop();
    int32_t w=d->width();
 
    radio1->setMaximumWidth(w);
 
 
    ///////////////////
 
    //grid->addWidget(createFirstExclusiveGroup(), 1, 0);
    setLayout(grid);
    setWindowTitle(tr("xxx"));
    // poza
    topLevelLabel = new QLabel("&xxx:", this);
    topLevelLabel->setText("sda");
    QPixmap pixmap(":/image/i.png");
    pixmap.scaledToHeight(30, Qt::SmoothTransformation);
    pixmap.scaledToWidth(50, Qt::SmoothTransformation);
    topLevelLabel->setPixmap(pixmap);
 
    topLevelLabel->setMask(pixmap.mask());
    topLevelLabel->show();
    grid->addWidget(topLevelLabel,4,0);
 
    // poza
 
    grid->addWidget(createNonExclusiveGroup(), 5, 0);
    /*
    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(textEdit);
    layout->addWidget(closeButton);
    setLayout(layout);
*/
    groupBox2->setTitle("ssssssssssssss");
    qline->setText("testing"); ;
    radio1->setText("dsa");
    radio2->setText("dsada");
    radio3->setText("adsdaddsadau");
}
 
QGroupBox *Chestionar::createNonExclusiveGroup()
{
    groupBox2 = new QGroupBox(tr("Non-Exclusive Checkboxes"));
    groupBox2->setFlat(true);
    //! [7]
 
    //! [8]
    closeButton = new QPushButton(tr("xxxxxxxxxxx"));
    connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));
 
    closeButton2 = new QPushButton(tr("&xxxxxxxxxxxxx"));
    connect(closeButton2, SIGNAL(clicked()), this, SLOT(urmatoareaslot()));
 
    //! [8]
 
 
    //! [9]
    QVBoxLayout *vbox = new QVBoxLayout;
    vbox->addWidget(closeButton2);
    vbox->addWidget(closeButton);
    // vbox->addStretch(1);
    groupBox2->setLayout(vbox);
 
    return groupBox2;
}
 
 
void Chestionar::setWindowFlags(Qt::WindowFlags flags)
 
{
    QWidget::setWindowFlags(flags);
 
    QString text;
 
    Qt::WindowFlags type = (flags & Qt::WindowType_Mask);
    if (type == Qt::Window) {
        text = "Qt::Window";
    } else if (type == Qt::Dialog) {
        text = "Qt::Dialog";
    } else if (type == Qt::Sheet) {
        text = "Qt::Sheet";
    } else if (type == Qt::Drawer) {
        text = "Qt::Drawer";
    } else if (type == Qt::Popup) {
        text = "Qt::Popup";
    } else if (type == Qt::Tool) {
        text = "Qt::Tool";
    } else if (type == Qt::ToolTip) {
        text = "Qt::ToolTip";
    } else if (type == Qt::SplashScreen) {
        text = "Qt::SplashScreen";
    }
 
    if (flags & Qt::MSWindowsFixedSizeDialogHint)
        text += "\n| Qt::MSWindowsFixedSizeDialogHint";
    if (flags & Qt::X11BypassWindowManagerHint)
        text += "\n| Qt::X11BypassWindowManagerHint";
    if (flags & Qt::FramelessWindowHint)
        text += "\n| Qt::FramelessWindowHint";
    if (flags & Qt::WindowTitleHint)
        text += "\n| Qt::WindowTitleHint";
    if (flags & Qt::WindowSystemMenuHint)
        text += "\n| Qt::WindowSystemMenuHint";
    if (flags & Qt::WindowMinimizeButtonHint)
        text += "\n| Qt::WindowMinimizeButtonHint";
    if (flags & Qt::WindowMaximizeButtonHint)
        text += "\n| Qt::WindowMaximizeButtonHint";
    if (flags & Qt::WindowContextHelpButtonHint)
        text += "\n| Qt::WindowContextHelpButtonHint";
    if (flags & Qt::WindowShadeButtonHint)
        text += "\n| Qt::WindowShadeButtonHint";
    if (flags & Qt::WindowStaysOnTopHint)
        text += "\n| Qt::WindowStaysOnTopHint";
    if (flags & Qt::CustomizeWindowHint)
        text += "\n| Qt::CustomizeWindowHint";
 
    textEdit->setPlainText(text);
}
 
void Chestionar::listItemClicked()
{
    QMessageBox::warning(this, "Gresit", QString("xxxxxxxxxxxxxx: "));
    topLevelLabel->setText("xxxxxxxxxxxx");
}
 
void Chestionar::urmatoareaslot()
{
 
 
}//in plus

#include <QtGui>
#include "chestionar.h"


Chestionar::Chestionar(QWidget *parent)
    : QWidget(parent)
{
    nr_rand = 0;
    variante_rasp = 0;
    lines = new QStringList;
    raspuns_corect ="Da";
    setAttribute(Qt::WA_DeleteOnClose);
    rg = 0;
    //scrollArea->setBackgroundRole(QPalette::Dark);
    QGridLayout  *grid = new QGridLayout(this);
    //  scrollArea->setsetLayout(grid);

    qline = new QTextEdit("dadasaasdsadadadsasdadsadassdadasda");
    qline->setReadOnly(true);
    //  grid->addWidget(qline,0,0);

    ///aa
    
    ///aa
    
    QScrollArea *scroll=new QScrollArea();
    
    scroll->setWidget(qline);
    //scroll->sets
    scroll->setAlignment(Qt::AlignLeft);
    //  scroll->setWidgetResizable(true);
    //scroll->widget()->resize();
    //  scroll->setBackgroundRole(QPalette::Dark);// set background of scroll Area
    //qline->updateGeometry();
    grid->addWidget(scroll,0,0);
    //////////////////////////
    

    radio1 = new QRadioButton(tr("&Radio busssssssssxxxxxxxxxxxxxxxxxxxxxxxxxtssssssssssssssssssssssssssssssssssssssssssssssssssston 1"));
    radio1->setMaximumWidth(10);;
    radio2 = new QRadioButton(tr("R&adio ssssssssxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxsssssssssssssssssssssssssssssssssssssssssssssssssbutton 2"));
    radio3 = new QRadioButton(tr("Ra&dio bssssxxxxxxxxxxxxxxxxxxxxxxxxxxxxxsssssssssssssssssssssssssssssssssssutton 3"));
    
    radio1->setChecked(true);
    
    grid->addWidget(radio1,1,0);
    grid->addWidget(radio2,2,0);
    grid->addWidget(radio3,3,0);
    
    QWidget *d = QApplication::desktop();
    int32_t w=d->width();
    
    radio1->setMaximumWidth(w);
    
    
    ///////////////////
    
    //grid->addWidget(createFirstExclusiveGroup(), 1, 0);
    setLayout(grid);
    setWindowTitle(tr("xxx"));
    // poza
    topLevelLabel = new QLabel("&xxx:", this);
    topLevelLabel->setText("sda");
    QPixmap pixmap(":/image/i.png");
    pixmap.scaledToHeight(30, Qt::SmoothTransformation);
    pixmap.scaledToWidth(50, Qt::SmoothTransformation);
    topLevelLabel->setPixmap(pixmap);
    
    topLevelLabel->setMask(pixmap.mask());
    topLevelLabel->show();
    grid->addWidget(topLevelLabel,4,0);
    
    // poza

    grid->addWidget(createNonExclusiveGroup(), 5, 0);
    /*
    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(textEdit);
    layout->addWidget(closeButton);
    setLayout(layout);
*/
    groupBox2->setTitle("ssssssssssssss");
    qline->setText("testing"); ;
    radio1->setText("dsa");
    radio2->setText("dsada");
    radio3->setText("adsdaddsadau");
}

QGroupBox *Chestionar::createNonExclusiveGroup()
{
    groupBox2 = new QGroupBox(tr("Non-Exclusive Checkboxes"));
    groupBox2->setFlat(true);
    //! [7]
    
    //! [8]
    closeButton = new QPushButton(tr("xxxxxxxxxxx"));
    connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));
    
    closeButton2 = new QPushButton(tr("&xxxxxxxxxxxxx"));
    connect(closeButton2, SIGNAL(clicked()), this, SLOT(urmatoareaslot()));
    
    //! [8]
    
    
    //! [9]
    QVBoxLayout *vbox = new QVBoxLayout;
    vbox->addWidget(closeButton2);
    vbox->addWidget(closeButton);
    // vbox->addStretch(1);
    groupBox2->setLayout(vbox);
    
    return groupBox2;
}


void Chestionar::setWindowFlags(Qt::WindowFlags flags)
        
{
    QWidget::setWindowFlags(flags);
    
    QString text;
    
    Qt::WindowFlags type = (flags & Qt::WindowType_Mask);
    if (type == Qt::Window) {
        text = "Qt::Window";
    } else if (type == Qt::Dialog) {
        text = "Qt::Dialog";
    } else if (type == Qt::Sheet) {
        text = "Qt::Sheet";
    } else if (type == Qt::Drawer) {
        text = "Qt::Drawer";
    } else if (type == Qt::Popup) {
        text = "Qt::Popup";
    } else if (type == Qt::Tool) {
        text = "Qt::Tool";
    } else if (type == Qt::ToolTip) {
        text = "Qt::ToolTip";
    } else if (type == Qt::SplashScreen) {
        text = "Qt::SplashScreen";
    }
    
    if (flags & Qt::MSWindowsFixedSizeDialogHint)
        text += "\n| Qt::MSWindowsFixedSizeDialogHint";
    if (flags & Qt::X11BypassWindowManagerHint)
        text += "\n| Qt::X11BypassWindowManagerHint";
    if (flags & Qt::FramelessWindowHint)
        text += "\n| Qt::FramelessWindowHint";
    if (flags & Qt::WindowTitleHint)
        text += "\n| Qt::WindowTitleHint";
    if (flags & Qt::WindowSystemMenuHint)
        text += "\n| Qt::WindowSystemMenuHint";
    if (flags & Qt::WindowMinimizeButtonHint)
        text += "\n| Qt::WindowMinimizeButtonHint";
    if (flags & Qt::WindowMaximizeButtonHint)
        text += "\n| Qt::WindowMaximizeButtonHint";
    if (flags & Qt::WindowContextHelpButtonHint)
        text += "\n| Qt::WindowContextHelpButtonHint";
    if (flags & Qt::WindowShadeButtonHint)
        text += "\n| Qt::WindowShadeButtonHint";
    if (flags & Qt::WindowStaysOnTopHint)
        text += "\n| Qt::WindowStaysOnTopHint";
    if (flags & Qt::CustomizeWindowHint)
        text += "\n| Qt::CustomizeWindowHint";
    
    textEdit->setPlainText(text);
}

void Chestionar::listItemClicked()
{
    QMessageBox::warning(this, "Gresit", QString("xxxxxxxxxxxxxx: "));
    topLevelLabel->setText("xxxxxxxxxxxx");
}

void Chestionar::urmatoareaslot()
{
    

}//in plus

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Or if someone can write just the part on how to display multiple images in one scroll area.

[wysota]

If you want to shrink an image, you have to do it yourself, QLabel is unable to shrink images, it can only expand them. Use QImage::scaled() or QPixmap::scaled() to get a scaled copy of the image. Then place the pixmap wherever you want it. If that's not what you are asking about then I don't understand what you are having problems with.

[flogh]

the problem is that i have a label with some text ,underneath it an image and underneth the image two buttons.
Because of the image the buttons aren't visible on the screen. Only half of the image fits to the screen
I want to be able to get to the buttons using a scrollbar , and I don't know how to do this .

I want the solution to be viable when I rotatea the screen to landscape also.

I've atached a picture with the problem



Thanks .

[wysota]

Use QScrollArea.

[flogh]

I tried but the scroll bar doesn't apear.Can you please be a little more specific.

QGridLayout *grid = new QGridLayout(this);
 scrollArea->setsetLayout(grid);

QGridLayout *grid = new QGridLayout(this);
 scrollArea->setsetLayout(grid);

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[wysota]

The code above is wrong. The layout should be set on a widget that gets put into the scroll area with setWidget() and the widget size should probably be controlled by the scroll area with setWidgetResizable(true). I can't say more unless you provide a minimal compilable example reproducing the problem.

[flogh]

Finally managed to resolve the defect thanks to Wysote (that explanation was extremelly helpfull.
If someone has the same problem this was the solution:

QVBoxLayout* grid = new QVBoxLayout(this);
 
QScrollArea* scr = new QScrollArea;
 
grid->addWidget(scr);
 
setLayout(grid);
 
QWidget *view = new QWidget(scr);
 
QVBoxLayout* viewLayout = new QVBoxLayout(view);
 
viewLayout->setAlignment( Qt::AlignTop );
 
view->setLayout(viewLayout);
 
scr->setWidget( view );
 
scr->setWidgetResizable(true);
 
scr->verticalScrollBar()->setSingleStep( 20 );
 
 
qline = new QTextEdit("dadasaasdsadadadsasdadsadassdadasda");
 
qline->setReadOnly(true);
 
viewLayout->addWidget(qline,0,0);

QVBoxLayout* grid = new QVBoxLayout(this);

QScrollArea* scr = new QScrollArea;

grid->addWidget(scr);

setLayout(grid);

QWidget *view = new QWidget(scr);

QVBoxLayout* viewLayout = new QVBoxLayout(view);

viewLayout->setAlignment( Qt::AlignTop );

view->setLayout(viewLayout);

scr->setWidget( view );

scr->setWidgetResizable(true);

scr->verticalScrollBar()->setSingleStep( 20 );


qline = new QTextEdit("dadasaasdsadadadsasdadsadassdadasda");

qline->setReadOnly(true);

viewLayout->addWidget(qline,0,0);

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all other widgets are added to viewLayout (viewLayout->addWidget)