If your requirement is " Please help me getting the mainwindow handle "
then try something like this:
bool continueSearching = true;
QWidget* widgetParent = NULL;
QMainWindow* mainWindow = NULL;
QWidget* currentWidget = this;
while(continueSearching == true) {
widgetParent = qobject_cast<QWidget*>(currentWidget->parent());
if(widgetParent != NULL) {
currentWidget = widgetParent;
mainWindow = qobject_cast<QMainWindow*>(currentWidget);
if(mainWindow != NULL) {
continueSearching = false;
}
} else {
continueSearching = false;
}
}
if(mainWindow != NULL) {
mainWindow->statusBar()->showMessage(tr("A new plot being
added!!"),5000);
}
The idea is to loop through all of the parents of the widgets until one is
a QMainWindow. The other approaches can also work like a global mainwindow
or something. This can be used to get the QMainWindow of any QWidget.
Note: I have briefly tested it and it seems to work. It might have problems
but the basic idea is there.
Regards,
On Tue, Apr 24, 2012 at 2:42 PM, Sujan Dasmahapatra <s...@lmwindpower.com>wrote:
> Thanks Diego and Konstantin for your valuable inputs. I am now doing
> qobject_cast for all of them, please check the code snippet below, now it’s
> crashing at tabWid step. It’s giving QASSERT failure. The failure is
> happening in the following file****
>
> ** **
>
> //qscopedpointer.h at the following line QASSERT(d)****
>
> inline T *operator->() const****
>
> {****
>
> Q_ASSERT(d); //this line it’s crashing.****
>
> return d;****
>
> }****
>
> ** **
>
> [code]****
>
> QWidget *wid = qobject_cast<QWidget *>(parent());****
>
> CSheet *sheet = qobject _cast<CSheet *>(wid->parent());****
>
> QScrollBar *scrollBar = qobject _cast<QScrollBar *>(sheet->parent());****
>
> CTabWidget *tabWid = qobject _cast<CTabWidget *>(scrollBar->parent()); //
> Here it is crashing, QSSERT(d) failure****
>
> CDataPage *dataPage = qobject _cast<CDataPage *>(tabWid->parent());****
>
> MainWindow *mainwin = qobject _cast<MainWindow *>(dataPage->parent());****
>
> mainwin->statusBar()->showMessage(tr("A new plot being added!!"),5000);***
> *
>
> [/code]****
>
> ** **
>
> CTabWidget is a custom class derived from QTabWidget.****
>
> ** **
>
> Please help me getting the mainwindow handle. Thanks for your reply.****
>
> ** **
>
> ** **
>
> ** **
>
> * *
>
> *From:* Diego Iastrubni [mailto:diegoi...@gmail.com]
> *Sent:* Tuesday, April 24, 2012 5:41 PM
> *To:* Sujan Dasmahapatra
> *Cc:* interest@qt-project.org
> *Subject:* Re: [Interest] type casting 5 levels down no error but not
> proper****
>
> ** **
>
> ** **
>
> On Tue, Apr 24, 2012 at 2:58 PM, Sujan Dasmahapatra <s...@lmwindpower.com>
> wrote:****
>
> please check the code snippet below:****
>
> ****
>
> [code]****
>
> QWidget *wid = reinterpret_cast<QWidget *>(parent());****
>
> CSheet *sheet = reinterpret_cast<CSheet *>(wid->parent());****
>
> QScrollBar *scrollBar = reinterpret_cast<QScrollBar *>(sheet->parent());**
> **
>
> CTabWidget *tabWid = reinterpret_cast<CTabWidget *>(scrollBar->parent());*
> ***
>
> CDataPage *dataPage = reinterpret_cast<CDataPage *>(tabWid->parent());***
> *
>
> MainWindow *mainwin = reinterpret_cast<MainWindow *>(dataPage->parent());*
> ***
>
> mainwin->statusBar()->showMessage(tr("A new plot being added!!"),5000);
> //[I][SIZE=7]Here it is crashing[/SIZE][/I]****
>
> [/code]****
>
> ****
>
> ** **
>
> You meant ****
>
> ** **
>
> [code]****
>
> MainWindow *mainwin = dynamic_cast<MainWindow>(dataPage->parent());****
>
> if (mainwin!=NULL) {****
>
> // do your thing****
>
> }****
>
> [/code]****
>
> ** **
>
> Or use qobject_cast as recommended. This will be faster then dynamic_cast.
> ****
>
> ** **
>
> _______________________________________________
> Interest mailing list
> Interest@qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest
>
>
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