[SOLVED] Cast event when window size is changed
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@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.
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@Bremenpl With
cast an eventwhat 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. -
@p3c0
Sorry for the formating. yes, I am trying to move a widget (UndoView) when the MainWindow is resized. -
@p3c0
Its something I am trying to implement from here http://docs.knobbits.org/qt4/tools-undoframework.html#mainwindow-class-definition -
@p3c0
Its something I am trying to implement from here http://docs.knobbits.org/qt4/tools-undoframework.html#mainwindow-class-definition@Bremenpl If you want to some it in accordance with the MainWindow that you can get width and height from
QResizeEventand move theQUndoView. Something likevoid MainWindow::resizeEvent(QResizeEvent *e) { undoView->move(e->size().width(),undoView->y()); }This will move
undoViewonxaxis as mainwindow resize. Add some more calculation as per your requirement. -
@Bremenpl If you want to some it in accordance with the MainWindow that you can get width and height from
QResizeEventand move theQUndoView. Something likevoid MainWindow::resizeEvent(QResizeEvent *e) { undoView->move(e->size().width(),undoView->y()); }This will move
undoViewonxaxis as mainwindow resize. Add some more calculation as per your requirement. -
@p3c0
Accesing undoView in resizeEvent scope causes segmentation fault, thats the problem. -
@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
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 -
@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
undoViewwas initialized prior to this first resize event.@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!
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@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!
