QStackwidget Multiple pages Issue[SOLVED]

marlenet15

@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.

mrjj

@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.

marlenet15

@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

mrjj

@marlenet15

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.

marlenet15

@mrjj It tells me that 'File 'sevenstacked.pro' has modification time 2.9e+0.4 s in the future' and it just hangs

mrjj

@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

marlenet15

@mrjj haha it gave me like 27 errors

mrjj

@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) );

}

marlenet15

@mrjj Ok so yes it does work that way. Do you have any idea why wouldn't work through the code I wrote?

mrjj

@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.

marlenet15

@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 :(

marlenet15

@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.

mrjj

@marlenet15

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 ?

marlenet15

@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!!!

mrjj

@marlenet15
oh good found :)
Nasty one.