[Qt-interest] Catch QTabPane change event before change

[David Boosalis]

if you subclass the widgets that go into the tab widget you can capture the
QWidget::showEvent(QShowEvent *)
before the tabChange signal gets called.  Example follows:



MyLabel::MyLabel(QString name, QWidget *parent):QLabel(name,parent)
{

}

void MyLabel::showEvent(QShowEvent *se)
{
    qDebug() << "Show Me " << QLabel::text();
    QLabel::showEvent(se);
}

TabChangeExample::TabChangeExample(QWidget *parent)
    : QWidget(parent)
{
    tabW = new QTabWidget(this);

connect(tabW,SIGNAL(currentChanged(int)),this,SLOT(tabChangedSlot(int)));
    myLabel1 = new MyLabel("ONE",tabW);
    myLabel2 = new MyLabel("Two",tabW);
    tabW->insertTab(0,myLabel1,"Alpha");
    tabW->insertTab(2,myLabel2,"Beta");
    QHBoxLayout *hbox = new QHBoxLayout(this);
    setLayout(hbox);
    hbox->addWidget(tabW);
}

TabChangeExample::~TabChangeExample()
{

}
void TabChangeExample::tabChangedSlot(int i)
{
    qDebug() << "Tab Changed:" << i;
}



When I run this code, the output is as follows:
Show Me  "ONE"
Tab Changed: 0.

in the showEvent() you could probable do things to change before you show
it, or in this case before QLabel::showEvent() gets called.






On Mon, Oct 4, 2010 at 11:37 PM, Matthias Paul <slayer81 at gmx.de> wrote:
>
>> Hello!
>>
>> I use a QTabPane with three 3 panes. Each panel has some QTextFields for
>> user inputs.
>> If the user changes input on pane 1 and then tries to switch to pane 2 or
>> 3, I'd like to display a message that asks the user whether he wants to save
>> his input or not.
>>
>> There's a signal "currentChange(int)" in QTabPane, which triggers after
>> the tab has actually changed. Is there a way to catch a signal _before_ the
>> change is going to happen, so I am able to overrule the change?
>>
>>
>> Thank you,
>> Paule
>> --
>> GMX DSL Doppel-Flat ab 19,99 &euro;/mtl.! Jetzt auch mit
>> gratis Notebook-Flat! http://portal.gmx.net/de/go/dsl
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>
>
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