[SOLVED] Label overflow?

david.luggen

Hello

Currently there happend something strange while I created a new class. There I added to the Header 3 QLabel's and a QGridLayout like this:

@private:

QLabel *first;
QLabel *second;
QLabel *third;

QGridLayout *gridLayout;@

Then I instance and added them in the source file to the layout, like:

@
first = new QLabel("first");
second = new QLabel("second");
third = new QLabel("third");

gridLayout = new QGridLayout;
gridLayout->addWidget(first, 0, 0);
gridLayout->addWidget(second, 1, 0);
gridLayout->addWidget(third, 2, 0);

setLayout(gridLayout);@

Then I creat from this class a Widget in the QMainWindow. Now, as I set this Widget show(), I get a runtime error. Curiously to say, if I add just two Labels, it works, from three Labels on I get this error. The other part is, if I define the QLabel's direclty in the source file like @QLabel *first = New QLabel("first")@ it works as well, what could cause this?

tdmatsu

I don't see any problems in your code. Could you elaborate this part a little bit?

[quote author="luggi" date="1306942242"]
Then I creat from this class a Widget in the QMainWindow. Now, as I set this Widget show(), I get a runtime error.
[/quote]

How are you using the widget in QMainWindow? What is the error message?

andre

Just a guess: perhaps you should set the size of the grid to be big enough so you actually have 3 columns?

david.luggen

The widget is used in the QMainWindow like this.

In the header:

@private:
MyWidget *myWidget;@

In the source file:

@ myWidget = new myWidget;
connect(aPushButton, SIGNAL(clicked()), myWidget, SLOT(show()));@

Everytime I click on this Button, the application freezes totally and Windows 7 is searching for a solution of this problem. The Qt Creator gives me the exit code -1073741819. I was searching a bit around this code and found something about access violation in windows.

@Andre: How can I set the size of the grid? I just found to set the height or width of a row or column.

Chuck Gao

Maybe error occurs in another place :)
The grid will resize automatically by itself. So you don't need to worry about it.

david.luggen

Okey, there are some news. If I set this class in the QMainWindow public like
@public:
MainWindow(QWidget *parent = 0);
~MainWindow();

MyWidget *myWidget;@

then it works. But I don't get why I get problems if the class is private?

david.luggen

Now it's time to close this thread, as I set the class back to private, just to try it a second time which I think is still necessary in windows, it worked! :-/