Problem with adding picture during running

[d@nyal]

Hi everybody,

I have a function which draws a picture on screen :

void MainWindow::darwAGate(int x,int y,int gate_code)
{
    //load images:
    QPixmap *pixmap_and = new QPixmap("../pix/AND.png");
 
    QHBoxLayout *h_layout = new QHBoxLayout();
    QLabel *label_tmp = new QLabel(this);
    label_tmp->setGeometry(x,y,gate_width_pixel,gate_height_pixel);
    label_tmp->setPixmap(*pixmap_and);
    h_layout->addWidget( label_tmp );
    this->setLayout(h_layout);
}

void MainWindow::darwAGate(int x,int y,int gate_code)
{
    //load images:
    QPixmap *pixmap_and = new QPixmap("../pix/AND.png");

    QHBoxLayout *h_layout = new QHBoxLayout();
    QLabel *label_tmp = new QLabel(this);
    label_tmp->setGeometry(x,y,gate_width_pixel,gate_height_pixel);
    label_tmp->setPixmap(*pixmap_and);
    h_layout->addWidget( label_tmp );
    this->setLayout(h_layout);
}

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I have to draw some pix in start of the program, so I like this:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    //draw pics
    darwAGate(100, 100, 3);
}

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

    //draw pics
    darwAGate(100, 100, 3);
}

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The on screen i see the pixs. So i dont have any problem till here.

In the ui I have a bottum which I want to use that for inserting additional pix on screen:

void MainWindow::on_pushButton_clicked()
{
    // a sample pic : 
    darwAGate(100, 100, 2);
}

void MainWindow::on_pushButton_clicked()
{
    // a sample pic : 
    darwAGate(100, 100, 2);
}

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Unfortunately I don't see any additional pic on screen, when I click on push_bottun.

Whats wrong?


Thanks in advance!

[Lykurg]

first, is the slot called? second, with setLayout in your draw function, you delete every earlier set layout. So this not not the right way to go!

[d@nyal]

first, is the slot called?

You mean I click on the bottun? (Yes!)

second, with setLayout in your draw function, you delete every earlier set layout. So this not not the right way to go!

Do mean that I can't paint several pics with this function,by deleting previous layout ?
How do you think I'd better to do ?

Thanks.

[Lykurg]

You mean I click on the bottun? (Yes!)

No, I hope you are able to click a button I meant have you checked if the slot is really called. E.g. Put a qWarning() statement in the slot and see if at runtime the message appears or use a debugger to check.

Do mean that I can't paint several pics with this function,by deleting previous layout ?
How do you think I'd better to do ?

Thanks.

You can, but setGeometry and using a layout is nonsense, since one "overwrites" the other. So in your case you probably want to use only setGeometry. Also you can store the positions in a local member variable and do all the painting in the paint event of your widget.