QLayout aligning widget as wrong

Question

I have QLayout class which accept QLabel and align it as Qt::AlignRight in cell, Initially I think it is working(since the size of layout cell is exactly equal to size of pixmap), I have an event associated with the QLabel, ie when mousepressEvent occured the size of QLabel increase(size of cell also increase so the size of entire column increases), That time the other QLabel in QLayout are getting left aligned, I want them as right aligned or centre aligned instead of left aligning,

My code is,

Container::Container()
{ 
    Layout = new QGridLayout;
    Layout->setHorizontalSpacing(0);
    Layout->setVerticalSpacing(10);
    Layout->setMargin(10); 
    for(int i = 0; i < 4; ++i)
    {
        holes[i] = new Hole; 
        Layout->addWidget(ui_holes[i], i, 0, 1, Qt::AlignRight);
        ui_holes[i].setPixmap("mypixmapname.png")
    } 
    Layout->setAlignment(Qt::AlignCenter);
    setLayout(Layout); 
    setMaximumSize(200,760);
    setMinimumSize(200,760);
    setSizePolicy( QSizePolicy::Fixed, QSizePolicy::Fixed);
}

void Screen::mousePressEvent(QMouseEvent *tevent)
{ 
    if(childAt(tevent->pos()))
    { 
        if(childAt(tevent->pos())->objectName() == "Hole")
        { 
            hole = static_cast<Hole *>(childAt(tevent->pos()));  
            hole->resize(QSize(160,160));  
        }
    }  
}  

void Screen::mouseReleaseEvent(QMouseEvent*)
{ 
    if(hole)
    {
        ui_Hole->resetSize();  
    } 
}

Hole is class inherited from QLabel and I have created two new member functions for Hole is resetSize and resize,

void Hole::resize(QSize size)
{
    setSize(size);
    if(!ui_HoleFlags[PIXMAP_EXISTS])
        return  void(0);
    QPixmap *tempPixmap = ui_resourceIcon();
    setPixmap(tempPixmap->scaled(size,Qt::IgnoreAspectRatio));
    delete tempPixmap;
} 

QPixmap* Hole::ui_resourceIcon()
{
    if(!ui_HoleFlags[ICON_EXISTS])
        return NULL;
    QPixmap *tempPixmap = new QPixmap(*pixmap());
    return tempPixmap;
}

void Hole::setSize(QSize size)
{
    setMaximumSize(size);
    setMinimumSize(size);
}

void Hole::resetSize()
{
    if(ui_HoleFlags[PIXMAP_EXISTS])
        setPixmap(*Pixmap);
    setSize(ICON_SIZE);
}

Thanks in advance

Answer 1

This way you will get labels always center aligned, no matter what size individual labels are.

#include <QLabel>
#include <QApplication>
#include <QLayout>
#include <QMouseEvent>

class Window : public QWidget
{
public:
    Window(QWidget *parent = 0) {}
    virtual ~Window() {}

protected:
    void mousePressEvent(QMouseEvent *event)
    {
        if (childAt(event->pos())) {
            QLabel *label = dynamic_cast<QLabel *>(childAt(event->pos()));
            if (label) {
                label->setMinimumSize(QSize(50, 50));
                label->setMaximumSize(QSize(50, 50));
            }
        }
    }
};

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    Window *window = new Window;
    window->show();
    window->resize(400, 300);

    QVBoxLayout *vLayout = new QVBoxLayout;

    QLabel *labels[4];
    for(int i = 0; i < 4; ++i) {
        labels[i] = new QLabel();
        labels[i]->setMaximumSize(30, 30);
        labels[i]->setMinimumSize(30, 30);

        QHBoxLayout *hLayout = new QHBoxLayout;
        hLayout->addItem(new QSpacerItem(10, 10, QSizePolicy::Expanding, QSizePolicy::Minimum));
        hLayout->addWidget(labels[i]);
        hLayout->addItem(new QSpacerItem(10, 10, QSizePolicy::Expanding, QSizePolicy::Minimum));
        vLayout->addLayout(hLayout);
    }

    window->setLayout(vLayout);
    window->setStyleSheet("QLabel {border: 1px solid red;}");

    return app.exec();
}