QStackedWidgets and other Layouts does not display properly

[PstdEr]

following is my problem statement:

create a horizantal layout in display
add stackedwidget to this Hlayout
the stackedwidget contains imagesWidget and loadWidget
the imagesWidget is further divided into gridlayout which contains some icons
so on the stackedwidget i have a plain widget and a widget withe gridlayout

now , when i click on any icon of the gridlayout it should open loadwidget and on to that
my application should be visible(here i am just playing with colors instead of applications)
for this purpose i again divide grid layout into Horizantal layout and adding the apps widget.

i face two problems here:

1) my gridlayout icons on imagesWidget are coming properly but when i select them i can see
under those icons same icons are present( i dont understand how i got duplicate)

2) when i close my application i am following the steps mentioned in exitapp code:

but my background of the loadWidget is still retianed but with icons from imageWidget

unfortunately i cannot paste the connect calls because the loading is not handled by connect
but some external events from some other module.

below is list of steps i am following.


------------------------------------------

controlsLayout=new QHBoxLayout();
      display->setLayout(controlsLayout);
 
      imagesWidget = new QWidget;
      loadWidget = new QWidget;
 
      QGridLayout *imagesLayout=new QGridLayout();
 
      controlsLayout=new QHBoxLayout();
      display->setLayout(controlsLayout);
 
      imagesWidget = new QWidget;
      loadWidget = new QWidget;
 
      imagesWidget->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Preferred);
      imagesWidget->setLayout(imagesLayout);// setting a grid layout for imagesWidget
      imgstack = new QStackedWidget; // new stacked widget  for imagesWidget and loadwidget
      imgstack->addWidget(imagesWidget);
      imgstack->addWidget(loadWidget);
      qDebug("imgstack cnt = %d",imgstack->count());
 
      controlsLayout->addWidget(imgstack); // stacked widget to horizantal layout of of display
 
      appstack = new QStackedWidget; // new stacked widget for applications
      const char *colors[]={"background-color: white", 
                          "background-color: black",
                          "background-color: blue",
                          "background-color: green",
                          "background-color: yellow",
                          "background-color: red",
                          "background-color: pink",
                          "background-color: cyan",
                          "background-color: white"
                           }; // unique colors are given for each widget to identify
 
 
      for(int apno = 0;apno < 9;apno ++){
         	appwidgs[apno] = new QWidget;
          	appwidgs[apno]->setStyleSheet(colors[apno]);
	        appstack->addWidget(appwidgs[apno]);
      }

controlsLayout=new QHBoxLayout();
      display->setLayout(controlsLayout);

      imagesWidget = new QWidget;
      loadWidget = new QWidget;

      QGridLayout *imagesLayout=new QGridLayout();

      controlsLayout=new QHBoxLayout();
      display->setLayout(controlsLayout);

      imagesWidget = new QWidget;
      loadWidget = new QWidget;

      imagesWidget->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Preferred);
      imagesWidget->setLayout(imagesLayout);// setting a grid layout for imagesWidget
      imgstack = new QStackedWidget; // new stacked widget  for imagesWidget and loadwidget
      imgstack->addWidget(imagesWidget);
      imgstack->addWidget(loadWidget);
      qDebug("imgstack cnt = %d",imgstack->count());

      controlsLayout->addWidget(imgstack); // stacked widget to horizantal layout of of display

      appstack = new QStackedWidget; // new stacked widget for applications
      const char *colors[]={"background-color: white", 
                          "background-color: black",
                          "background-color: blue",
                          "background-color: green",
                          "background-color: yellow",
                          "background-color: red",
                          "background-color: pink",
                          "background-color: cyan",
                          "background-color: white"
                           }; // unique colors are given for each widget to identify


      for(int apno = 0;apno < 9;apno ++){
         	appwidgs[apno] = new QWidget;
          	appwidgs[apno]->setStyleSheet(colors[apno]);
	        appstack->addWidget(appwidgs[apno]);
      }

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--------------------------
upon click on any of the image the following will be performed.

imgstack->setCurrentIndex(1);
                //loadWidget->setStyleSheet("background-color: blue");
                qDebug("currindx=%d\n",imgstack->currentIndex());
 
               loadapp();

imgstack->setCurrentIndex(1);
                //loadWidget->setStyleSheet("background-color: blue");
                qDebug("currindx=%d\n",imgstack->currentIndex());

               loadapp();

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--------------------------
loadapp code:

QHBoxLayout *hl = new QHBoxLayout;
    loadWidget->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Preferred);
    loadWidget->setLayout(hl);
    hl->addWidget(appstack,0,0);
 
    qDebug("curr_apps =%d",appstack->currentIndex());
    appstack->setCurrentIndex(currpos);

QHBoxLayout *hl = new QHBoxLayout;
    loadWidget->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Preferred);
    loadWidget->setLayout(hl);
    hl->addWidget(appstack,0,0);

    qDebug("curr_apps =%d",appstack->currentIndex());
    appstack->setCurrentIndex(currpos);

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---------------------------------------

exitapp code:

appstack->removeWidget(appwidgs[currpos]);
    imgstack->removeWidget(loadWidget);
    imgstack->setCurrentWidget(imagesWidget);

appstack->removeWidget(appwidgs[currpos]);
    imgstack->removeWidget(loadWidget);
    imgstack->setCurrentWidget(imagesWidget);

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[ChrisW67]

If you have a navigation panel of 9 buttons, each of which should switch to a different 'application' then surely you want the single stacked widget to have 10 panels: the navigation panel and each of the 9 applications.

Here's an example:

#include <QtGui>
 
class MainWindow: public QMainWindow
{
    Q_OBJECT
 
    QStackedWidget *stack;
 
public:
    explicit MainWindow(QWidget *p = 0): QMainWindow(p)
    {
         resize(512, 512);
        stack = new QStackedWidget(this);
        setCentralWidget(stack);
 
        // Plumbing
        QSignalMapper *mapper = new QSignalMapper(stack);
        connect(mapper, SIGNAL(mapped(int)), stack, SLOT(setCurrentIndex(int)));
 
        // Nav panel
        QWidget *panel = new QWidget(this);
        stack->addWidget(panel); // index 0
 
        QGridLayout *grid = new QGridLayout(this);
        panel->setLayout(grid);
        for (int r = 0; r < 3; ++r) {
            for (int c = 0; c < 3; ++c) {
                // Create the navigation button
                const int index = r * 3 + c + 1;
                QPushButton *navButton  = new QPushButton(QString("%1").arg(index), panel);
                grid->addWidget(navButton, r, c, Qt::AlignCenter );
 
                // and the matching 'application'
                QPushButton *button = new QPushButton(QString("App %1, click to end").arg(index), stack);
                stack->addWidget(button);
                connect(button, SIGNAL(clicked()), SLOT(goHome()));  // needs some way to go back
 
                // make the nav button switch
                mapper->setMapping(navButton, index);
                connect(navButton, SIGNAL(clicked()), mapper, SLOT(map()));
            }
        }
    }
 
public slots:
    void goHome()
    {
        stack->setCurrentIndex(0);
    }
};
 
int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    MainWindow w;
    w.show();
    return app.exec();
}
#include "main.moc"

#include <QtGui>

class MainWindow: public QMainWindow
{
    Q_OBJECT

    QStackedWidget *stack;

public:
    explicit MainWindow(QWidget *p = 0): QMainWindow(p)
    {
         resize(512, 512);
        stack = new QStackedWidget(this);
        setCentralWidget(stack);

        // Plumbing
        QSignalMapper *mapper = new QSignalMapper(stack);
        connect(mapper, SIGNAL(mapped(int)), stack, SLOT(setCurrentIndex(int)));

        // Nav panel
        QWidget *panel = new QWidget(this);
        stack->addWidget(panel); // index 0

        QGridLayout *grid = new QGridLayout(this);
        panel->setLayout(grid);
        for (int r = 0; r < 3; ++r) {
            for (int c = 0; c < 3; ++c) {
                // Create the navigation button
                const int index = r * 3 + c + 1;
                QPushButton *navButton  = new QPushButton(QString("%1").arg(index), panel);
                grid->addWidget(navButton, r, c, Qt::AlignCenter );

                // and the matching 'application'
                QPushButton *button = new QPushButton(QString("App %1, click to end").arg(index), stack);
                stack->addWidget(button);
                connect(button, SIGNAL(clicked()), SLOT(goHome()));  // needs some way to go back

                // make the nav button switch
                mapper->setMapping(navButton, index);
                connect(navButton, SIGNAL(clicked()), mapper, SLOT(map()));
            }
        }
    }

public slots:
    void goHome()
    {
        stack->setCurrentIndex(0);
    }
};

int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    MainWindow w;
    w.show();
    return app.exec();
}
#include "main.moc"

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[PstdEr]

Thanks ChrisW,

i have done almost the same way , but my problem is , on my 3X3 layout window i am getting duplicate buttons by overlapping on existing.

and one more problem is when i use removeWidget :
suppose say i have displayed an application, now i want to go back to my image window where i have list of icons for naviagtion.
i am following the statements below.

appstack->removeWidget(appwidgs[currpos]); // to remove the crrent application upon exit
imgstack->removeWidget(loadWidget); // to remove widget used for application display
imgstack->setCurrentWidget(imagesWidget);// set images widget as current display

i am getting my images widget but , other two widgets are not geting removed.
i understand remove widget means , just hiding the widget to make path for other widgets.

[ChrisW67]

Read my example again: it's your entire program in a nutshell. My point is that you do not need to do anything other than to switch pages in the single QStackedWidget. No adding or removing widgets after the initial construction, no multiple stacked widgets, nothing special to do during destruction.

[PstdEr]

I now follow the same way as you suggested, but still i am getting the same problem.
i really need to solve this.
please have a look.

QHBoxLayout controlsLayout=new QHBoxLayout();
      display->setLayout(controlsLayout);
 
      imgstack = new QStackedWidget;
      imagesWidget = new QWidget;
      imgstack->addWidget(imagesWidget);
 
      QGridLayout *imagesLayout=new QGridLayout();
      imagesWidget->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Preferred);
 
      no_of_icons =9;
 
      RowCount=no_of_icons/COL +
                (temp =(no_of_icons%COL?1:0));
 
      temp=0;
      for( i=0;i<RowCount;i++)
      {
          for(j=0;j<3;j++)
          {
           Buttons[temp]=new QPushButton();
 
           QPixmap pixmap(":/images/img.jpeg");
           QIcon ButtonIcon(pixmap);
           Buttons[temp]->setIcon(ButtonIcon);
           Buttons[temp]->setIconSize(pixmap.rect().size());
 
           Buttons[temp]->setMinimumWidth(80);
           Buttons[temp]->setMinimumHeight(80);
           Buttons[temp]->setMaximumWidth(80);
           Buttons[temp]->setMaximumHeight(80);
 
            QLabel *label = new QLabel("Button",Buttons[temp],0);
            label->setAlignment(Qt::AlignVCenter|Qt::AlignVCenter);
            label->show();
            imagesLayout->addWidget(Buttons[temp],i,j);
            temp++;
            if(imagesLayout->count() ==no_of_icons)
            break;
          }
 
        }
 
    currpos=0;
 
      if(no_of_icons>0)
      {
          QPixmap pixmap(":/images/image.jpeg");
          QIcon ButtonIcon(pixmap);
 
         Buttons[currpos]->setIcon(ButtonIcon);
         Buttons[currpos]->setIconSize(pixmap.rect().size());
         Buttons[currpos]->setMinimumWidth(68+10);
         Buttons[currpos]->setMinimumHeight(60+10);
         Buttons[currpos]->setMaximumWidth(68+10);
         Buttons[currpos]->setMaximumHeight(68+10);
 
      }
    imagesWidget->setLayout(imagesLayout);
    qDebug("imgstack cnt = %d",imgstack->count());
    const char *colors[]={"background-color: cyan",
                          "background-color: grey",
                          "background-color: blue",
                          "background-color: green",
                          "background-color: yellow",
                          "background-color: red",
                          "background-color: pink",
                          "background-color: white",
                          "background-color: orange"
                           };
 
 
      for(int apno = 0;apno < 9;apno ++){
          appwidgs[apno] = new QWidget;
          appwidgs[apno]->setStyleSheet(colors[apno]);
          imgstack->addWidget(appwidgs[apno]);
      }
 
    controlsLayout->addWidget(imgstack);
    qDebug("imgstack_count = %d",imgstack->count());

QHBoxLayout controlsLayout=new QHBoxLayout();
      display->setLayout(controlsLayout);

      imgstack = new QStackedWidget;
      imagesWidget = new QWidget;
      imgstack->addWidget(imagesWidget);
 
      QGridLayout *imagesLayout=new QGridLayout();
      imagesWidget->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Preferred);
 
      no_of_icons =9;

      RowCount=no_of_icons/COL +
                (temp =(no_of_icons%COL?1:0));

      temp=0;
      for( i=0;i<RowCount;i++)
      {
          for(j=0;j<3;j++)
          {
           Buttons[temp]=new QPushButton();

           QPixmap pixmap(":/images/img.jpeg");
           QIcon ButtonIcon(pixmap);
           Buttons[temp]->setIcon(ButtonIcon);
           Buttons[temp]->setIconSize(pixmap.rect().size());

           Buttons[temp]->setMinimumWidth(80);
           Buttons[temp]->setMinimumHeight(80);
           Buttons[temp]->setMaximumWidth(80);
           Buttons[temp]->setMaximumHeight(80);

            QLabel *label = new QLabel("Button",Buttons[temp],0);
            label->setAlignment(Qt::AlignVCenter|Qt::AlignVCenter);
            label->show();
            imagesLayout->addWidget(Buttons[temp],i,j);
            temp++;
            if(imagesLayout->count() ==no_of_icons)
            break;
          }

        }

    currpos=0;

      if(no_of_icons>0)
      {
          QPixmap pixmap(":/images/image.jpeg");
          QIcon ButtonIcon(pixmap);

         Buttons[currpos]->setIcon(ButtonIcon);
         Buttons[currpos]->setIconSize(pixmap.rect().size());
         Buttons[currpos]->setMinimumWidth(68+10);
         Buttons[currpos]->setMinimumHeight(60+10);
         Buttons[currpos]->setMaximumWidth(68+10);
         Buttons[currpos]->setMaximumHeight(68+10);

      }
    imagesWidget->setLayout(imagesLayout);
    qDebug("imgstack cnt = %d",imgstack->count());
    const char *colors[]={"background-color: cyan",
                          "background-color: grey",
                          "background-color: blue",
                          "background-color: green",
                          "background-color: yellow",
                          "background-color: red",
                          "background-color: pink",
                          "background-color: white",
                          "background-color: orange"
                           };


      for(int apno = 0;apno < 9;apno ++){
          appwidgs[apno] = new QWidget;
          appwidgs[apno]->setStyleSheet(colors[apno]);
          imgstack->addWidget(appwidgs[apno]);
      }

    controlsLayout->addWidget(imgstack);
    qDebug("imgstack_count = %d",imgstack->count());

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-----------------------
currpos = 0 ; // will be incremented based on no of left and right arrows
in loadapp()

imgstack->setCurrentIndex(currpos+1); //loads the widget lets say i select index 3(widget:blue)
printf("load:curridx =%d",imgstack->currentIndex());

imgstack->setCurrentIndex(currpos+1); //loads the widget lets say i select index 3(widget:blue)
printf("load:curridx =%d",imgstack->currentIndex());

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-------------------------
in exitapp() // will be invoked when i press exit button

imgstack->setCurrentIndex(0); // widget at index 0 is loaded,but still the blue color can be seen.
printf("exit:curridx =%d",imgstack->currentIndex());

imgstack->setCurrentIndex(0); // widget at index 0 is loaded,but still the blue color can be seen.
printf("exit:curridx =%d",imgstack->currentIndex());

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-------------
out put: (when i load the 0th app that is placed at index 1.)

imgstack cnt = 1
imgstack_count = 10

load :currindx=1
exit:curridx =0

[ChrisW67]

Your code fragment, while full of cruft, is not fundamentally broken. However, I can only guess what the rest of you program is doing or even where/when you are calling this code from. I could guess that you call this code several times and lay one layout over another... but it's only a WAG. Produce a simple, complete program that demonstrates the problem and post it.