[SOLVED] Cast event when window size is changed

[Bremenpl]

Hello there,
I was wondering either it is possible to cast an event when I press maximize button in my main window, or resize it? I was trying to find some refference about this but with no luck. I Would aprichiate any help!

[p3c0]

@Bremenpl Re-implement resizeEvent inside the mainwindow and cast events there.

[Bremenpl]

@p3c0
Could you please show me the proper way of doing this? So far I have added the method in my .h class:

void resizeEvent(QResizeEvent * /* event */);

And in .cpp:

void MainWindow::resizeEvent(QResizeEvent * /* event */)
{
    moveUndoView();
}

The moveUndoView() is :

void MainWindow::moveUndoView()
{
    QPoint p = pos();

    p += QPoint(width(), height());
    p -= QPoint(undoView->width(), undoView->height());
    undoView->move(p);
}

I am getting segmentation fault when running this code. Any hints? The segfault occurs at line:
p -= QPoint(undoView->width(), undoView->height());

For some reason I cannot acces undoView Object from this scope.

[p3c0]

@Bremenpl With cast an event what do you mean by it ? What are you trying to achieve ? Can you post more details ? Looking at code it seems you are trying to move some widget.
Also please use ``` (3 backticks) for posting code blocks.

[Bremenpl]

@p3c0
Sorry for the formating. yes, I am trying to move a widget (UndoView) when the MainWindow is resized.

[p3c0]

@Bremenpl And what is UndoView ? What type ?

[Bremenpl]

@p3c0
Its something I am trying to implement from here http://docs.knobbits.org/qt4/tools-undoframework.html#mainwindow-class-definition

[p3c0]

@Bremenpl If you want to some it in accordance with the MainWindow that you can get width and height from QResizeEvent and move the QUndoView. Something like

void MainWindow::resizeEvent(QResizeEvent *e)
{
    undoView->move(e->size().width(),undoView->y());
}

This will move undoView on x axis as mainwindow resize. Add some more calculation as per your requirement.

[Bremenpl]

@p3c0
Accesing undoView in resizeEvent scope causes segmentation fault, thats the problem.

[p3c0]

@Bremenpl Ok. So is undoView initialized before using it ?

[Bremenpl]

@p3c0
Theres an initialisation of the pointer in the class header:

QUndoView *undoView;

Then In the mainwindow constructor I am running:

undoStack = new QUndoStack(this);
undoView = new QUndoView(undoStack);
undoView->setWindowTitle(tr("Command List"));
undoView->setWindowFlags(Qt::WindowStaysOnTopHint);
undoView->setAttribute(Qt::WA_QuitOnClose, false);
undoView->show();

moveUndoView(); // PLEASE NOTE THAT THIS WORKS IN HERE, NO SEGFAULTS

[p3c0]

@Bremenpl Does it crash when you attempt to resize manually or as soon as you execute the application ? Because resize event will be fired at application startup too. Make sure undoView was initialized prior to this first resize event.

[Bremenpl]

@p3c0
You are right, that is the problem. The thing is, that I cant really create this object before i execute this->show() (MainWindow), because the program crashes as well.

Edit: undoStack and undoView had to be both declared before ui is build, I have forgot about that one. Now everything works, thank you a lot for help!

[p3c0]

@Bremenpl You're Welcome :) You can mark the post as solved by editing the post title and prepending [Solved].
Happy Coding..