EventHandling

[SGaist]

Hi,

You can have a look at "this":http://qt-project.org/doc/qt-5/eventsandfilters.html chapter from the documentation which explains the event system used by Qt.

There's an equivalent chapter for QML

[mvenkat061]

Thank you .. it is working.I am get event on window/ widget click but how to get event on button click or button state change or change item in combo box ...etc..

[mvenkat061]

I dont want any event on window click .
I need event on mouse click on any widget like button , check box ..
and i need event info like event generate widget id, state ..etc..

can you please help me.

Thank you
Regard
Venkat

[SGaist]

Then you should take a look at the eventFilter function. Do you really need that level of details ? If so, why ?

[mvenkat061]

Thank you,
yes i need all info about event because the existing GUI application design is such a way that,
each events have some set of actions to excite based on some preconditions.

Ex: Event ID = button1
precondition = "read text on button2
Action = if precondition oK then write text on button3.

so all events, preconditions and Actions are configurable.
Each time will check event Id which is return from TRT_GETINPUT(..) with configuration events if both are matching then we check precondition and perform action.

so that why i need a function which return event info.

[SGaist]

AFAIK you can't match that pattern without creating e.g. your own events with these parameters. Or maybe a state machine.

[mvenkat061]

hi,
Actually eventID and precondition and action is not pattren.
Actual Config format is
[event]
EventId = button1 //Object ID
[Precondition]
ObjectID = button2 //object id for precondition
Attribut = text // read text on button2

[Action]
precondition value = Hello //if text on button is hello
[API]
objectId = button3
action = 3 /
Argumet = hello /// set text "hello" on button 3 ; we have set of function 3 equivalent to set text.

[mvenkat061]

EventFilter is called for mouse button press on button object.

i have added installEventFilter in constructor.?

Can we need to include any .h or any thing in .pro file
my code is:

In .h

bool eventFilter(QObject *object, QEvent *event);

in .cpp

mainwindow :: mainwindow(....)
{
button->installEventfilter(this);
}
bool mainwindow::eventFilter(QObject *object, QEvent *event)
{
if(event->type() == QEvent::MouseButtonPress)
{
label->settext("hello");
}
}
can you plz help me how work with event filter

[mvenkat061]

hi
bool eventfilter(Qobject* , QEvent* );
is working if i create a project with base class of Qwidget but it is not working if i create project with base class of QMainWindow.

Why this is any reason for it?
How can make it work for base class Qmainwindow.

Thank you
Venkat

[SGaist]

QMainWindow is a way more complex widget (docks/central widget etc…) You may have to install your event filter on multiple widgets.

[mvenkat061]

hi,
I have install event filter with function "button->installEventFilter(this)"

i am try to install on button

i am installing event filter after setupUi(..);

i am not getting window after run the program.
i am getting message like "The program has unexpectedly finished"
and " c:\Qt_practice\mouse_event.exe existed with code -1073741819".

[SGaist]

What does a run through the debugger tells you ?