QStackwidget Multiple pages Issue[SOLVED]
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I have added 7 pages into a stackwidget. However, it always crashes when it gets to the last page (The program closes). It works fine with 6 pages and I read that I can have as many pages as I would like. I also tested if the last page was giving me problems but I tested it by commenting out _page5 and it works.
_stackedWidget = new QStackedWidget; _stackedWidget->addWidget(_page1); _stackedWidget->addWidget(_page2); _stackedWidget->addWidget(_page3); _stackedWidget->addWidget(_page4); _stackedWidget->addWidget(_page5); _stackedWidget->addWidget(_page6); _stackedWidget->addWidget(_page7);Page7 gets called through the signal and slots function by:
void MainWindow::goToPage7() { _stackedWidget->setCurrentWidget(_page7); }I have Qt Creator 3.0.1 Based on Qt 5.2.1 (GCC 4.8.2, 64 bit)
I was wondering if it is a bug and if so to what version should I upgrade it to.
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Hi,
Are you sure _page7 is properly allocated ?
What does a run through the debugger tell you ?
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@SGaist It tells me it ended unexpectedly
I am sure it is because when I comment out one of the _stackedWidget->addWidget(_page5); it works. It is just when I add more than 6 pages that it crashes.
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Hi
For test.
If you do it in Designer in a new fresh project.
Just Add QStackedWidget to Mainwindow.ui
and right click it to add pages.
Does it crash when more than 7 there also?
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@mrjj That was my first option when I was creating the stackwidget. However, I wanted to go from one page to another and when I clicked the button nothing would happen but when I wrote it in code it worked fine.
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@marlenet15
Ok, that was odd as a stacked widget on UI and
button where you call void setCurrentIndex(int index)should work just fine.
But the important part.
Did it crash when adding more that 7 pages that way?
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@mrjj yes it does.
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@marlenet15
Ok !?!
it crashes if you - in a blank new project,
just right click and add more than 7 pages?
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@mrjj Oh no. I meant it crashes if I used void setCurrentIndex(int index) instead of setCurrentWidget(_page7);
It wouldn't crash but it wouldn't allow me to go to the next page since clicking the button wouldn't do anything.
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@marlenet15
ok.so you had a bug. i guess.
try this sample
https://www.dropbox.com/s/xuhzip7p52g4guk/sevenstacked.zip?dl=0
it can go back and forth.
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@mrjj I tried running it but nothing happens. The option to build is grayed out.
and also all the pages that I am adding onto the stackwidget are classes I created so I am not sure it that also created an issue when I tried doing it through .ui
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oh, go to Projects (left side icons) and adjust build path to
somewhere that exists or set it if none.Well the stacked controls QWidgets so its ok its your own I think.
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@mrjj It tells me that 'File 'sevenstacked.pro' has modification time 2.9e+0.4 s in the future' and it just hangs
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@marlenet15
OK?
Pretty strange.just delete it and make a new .pro file and put this in it
just a default one.#------------------------------------------------- # # Project created by QtCreator 2015-10-18T21:53:24 # #------------------------------------------------- QT += core gui greaterThan(QT_MAJOR_VERSION, 4): QT += widgets TARGET = sevenstacked TEMPLATE = app SOURCES += main.cpp\ mainwindow.cpp HEADERS += mainwindow.h FORMS += mainwindow.ui
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@mrjj haha it gave me like 27 errors
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@marlenet15
Ehh. ok.
Not sure what is going on.Make new default project and then copy mainwindow.cpp/h and mainwindow.ui
to it ?Anyway, was just a stacked widget with 10 pages and 2 buttons to go forth and back between the pages.
void MainWindow::on_pushButton_11_released() { int cur = ui->stackedWidget->currentIndex() + 1; ui->stackedWidget->setCurrentIndex(cur); ui->label->setText( QString::number(cur) ); } void MainWindow::on_pushButton_12_released() { int cur = ui->stackedWidget->currentIndex() - 1; ui->stackedWidget->setCurrentIndex(cur); ui->label->setText( QString::number(cur) ); }
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@mrjj Ok so yes it does work that way. Do you have any idea why wouldn't work through the code I wrote?
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@marlenet15
:) super
Well, I cant see how you create _page1 - _page7
you must have XX * _page1 = new XX; somewhere.
and it might crash if you use setCurrentWidget for deallocated
object or something like that.Also using setCurrentWidget, that widget must already be inserted into stacked.
Most of the time I just insert pages in UI as it is far easier.
You can even add dynamic also, if needed.
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@mrjj wouldn't it be page7 that could be deallocated? I have been looking at my code like 50 times and I still can't find the error. I set the pages on the UI and page7 still doesn't work :(
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@marlenet15 Ok So I commented out 90% of the code and page7 works! So now I have to uncomment section by section to figure out what is making page 7 crash.
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well its hard to guess when I cant see all code.
Do you do
QWidget *page7 = new QWidget()when you create them ?
or now you insert them into the stacked in the UI ?
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@mrjj I inserted it now on the UI. I figured it out! I had another class where I had an array of QStrings which contains the titles for each page. I had an array of size 6 because I had only focused on the 6 pages I created. However, when I created the 7th page it would crash because the index 6 didn't exist since the array goes from 0-5. Thank you so much for your help!!!
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@marlenet15
oh good found :)
Nasty one.
