Qt-interest Archive, July 2007
Signals/Slots
Message 1 in thread
Hi,
I am using qt designer 3.3.8 along with kdevelop in fedora core 6
environment.
*What I want to do :
I have a main window that contains a widget. When I load a file from an
action in this window, I would like to let the widget know that the file
has changed.
*What I did:
I tried adding a signal in my main window through the tab Members in the
object explorer of qt, the signal is called fileChanged(const QString
&fileName). Then I link my signal to a function name load(const QString
&fileName) in mycustomwidget. The signal is emitted when I load the
file, in the function fileOpen of my class mainWindow_subclass created
through the kdevelop wizard which inherits from my mainWindow class.
*Results:
I thougt this would work but it does not. The program compiles
correctly, but when I launch the application I get:
QObject::connect: No such signal mainWindow::fileChanged(const QString
&fileName)
QObject::connect: sender name: mainWindow
QObject::connect: receiver name mycustomwidget
and of course when I open the file, the signal is not intercepted.
Thanks,
Marie
--
[ signature omitted ]
Message 2 in thread
Call the signal
fileChanged( const QString & )
Get rid of the variable name when you are calling connect
Scott
> -----Original Message-----
> From: Marie-Christine Vallet [mailto:mmvallet@xxxxxxxxxxx]
> Sent: Wednesday, July 04, 2007 11:44 AM
> To: qt-interest@xxxxxxxxxxxxx
> Subject: Signals/Slots
>
> Hi,
> I am using qt designer 3.3.8 along with kdevelop in fedora core 6
> environment.
>
> *What I want to do :
> I have a main window that contains a widget. When I load a file from
an
> action in this window, I would like to let the widget know that the
file
> has changed.
>
> *What I did:
> I tried adding a signal in my main window through the tab Members in
the
> object explorer of qt, the signal is called fileChanged(const QString
> &fileName). Then I link my signal to a function name load(const
QString
> &fileName) in mycustomwidget. The signal is emitted when I load the
> file, in the function fileOpen of my class mainWindow_subclass created
> through the kdevelop wizard which inherits from my mainWindow class.
>
> *Results:
> I thougt this would work but it does not. The program compiles
> correctly, but when I launch the application I get:
>
> QObject::connect: No such signal mainWindow::fileChanged(const QString
> &fileName)
> QObject::connect: sender name: mainWindow
> QObject::connect: receiver name mycustomwidget
>
> and of course when I open the file, the signal is not intercepted.
>
>
> Thanks,
> Marie
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
> "unsubscribe" in the subject or the body.
> List archive and information: http://lists.trolltech.com/qt-interest/
--
[ signature omitted ]
Message 3 in thread
It works now,
Thanks,
Marie
Scott Aron Bloom wrote:
> Call the signal
>
> fileChanged( const QString & )
>
> Get rid of the variable name when you are calling connect
>
> Scott
>
>
>> -----Original Message-----
>> From: Marie-Christine Vallet [mailto:mmvallet@xxxxxxxxxxx]
>> Sent: Wednesday, July 04, 2007 11:44 AM
>> To: qt-interest@xxxxxxxxxxxxx
>> Subject: Signals/Slots
>>
>> Hi,
>> I am using qt designer 3.3.8 along with kdevelop in fedora core 6
>> environment.
>>
>> *What I want to do :
>> I have a main window that contains a widget. When I load a file from
>>
> an
>
>> action in this window, I would like to let the widget know that the
>>
> file
>
>> has changed.
>>
>> *What I did:
>> I tried adding a signal in my main window through the tab Members in
>>
> the
>
>> object explorer of qt, the signal is called fileChanged(const QString
>> &fileName). Then I link my signal to a function name load(const
>>
> QString
>
>> &fileName) in mycustomwidget. The signal is emitted when I load the
>> file, in the function fileOpen of my class mainWindow_subclass created
>> through the kdevelop wizard which inherits from my mainWindow class.
>>
>> *Results:
>> I thougt this would work but it does not. The program compiles
>> correctly, but when I launch the application I get:
>>
>> QObject::connect: No such signal mainWindow::fileChanged(const QString
>> &fileName)
>> QObject::connect: sender name: mainWindow
>> QObject::connect: receiver name mycustomwidget
>>
>> and of course when I open the file, the signal is not intercepted.
>>
>>
>> Thanks,
>> Marie
>>
>> --
>> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
>> "unsubscribe" in the subject or the body.
>> List archive and information: http://lists.trolltech.com/qt-interest/
>>
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with "unsubscribe" in the subject or the body.
> List archive and information: http://lists.trolltech.com/qt-interest/
>
>
>
--
[ signature omitted ]
Message 4 in thread
Hai,
I am using the version Qt3.3.4.
I am using the scrollbar in the application. I have to perform some task
when the down arrow button in the scrollbar gets disabled.
Is there any method/signal that tells when the scrollbar down arrow is
disabled?
Thanks for help
Regards
DP
DISCLAIMER
âThe information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you"
--
[ signature omitted ]
Message 5 in thread
On 7/5/07, deepa <deepa@xxxxxxxxxx> wrote:
>
> Hai,
>
> I am using the version Qt3.3.4.
>
> I am using the scrollbar in the application. I have to perform some task
> when the down arrow button in the scrollbar gets disabled.
>
> Is there any method/signal that tells when the scrollbar down arrow is
> disabled?
You can connect to QScrollBar::valueChanged(int) and compare that value to
QScrollBar::maxValue(). I assume that the down button is disabled if and
only if the current value equals the maximum value.
Tom
