ThuNguyet,
I'd do as your last sentence: One place to handle the event, check for
active form.
Huy T. Phan
______________________________________________________________
Message: 2
Date: Thu, 18 Apr 2002 10:19:38 -0700 (PDT)
From: ThuNguyet Nguyen <[EMAIL PROTECTED]>
Subject: Handle user events, please help.
Hello all,
In my Palm program, I have 5 forms A, B, C, D, E. The user can move between
forms.
The main loop is as below:
static void AppEventLoop(void)
{
UInt16 error;
EventType event;
do {
EvtGetEvent(&event, evtWaitForever);
if (! SysHandleEvent(&event))
if (! MenuHandleEvent(0, &event, &error))
if (! AppHandleEvent(&event))
if (!AppHandleUserEvent(&event))
FrmDispatchEvent(&event);
} while (event.eType != appStopEvent);
}
//snip code
static Boolean AppHandleEvent(EventPtr eventP)
{
UInt16 formId;
FormPtr frmP;
if (eventP->eType == frmLoadEvent)
{
// Load the form resource.
formId = eventP->data.frmLoad.formID;
frmP = FrmInitForm(formId);
FrmSetActiveForm(frmP);
// Set the event handler for the form. The handler of the currently
// active form is called by FrmHandleEvent each time is receives an
// event.
switch (formId)
{
// ...
case BForm:
FrmSetEventHandler(frmP, BFormHandleEvent);
break;
}
// ...
}
}
The program generates some user events. I need to have each certain form
handles some specific
events.
For example, I need to have form B handles user event X and Y. So, I put to
code to handle event X
and Y in BFormHandleEvent().
To prevent the events from not being handled when user go to other form, I
also put the code to
handle event X, Y (do some general things but not update the active form B) in
AppHandleUserEvent().
I did set handled to true after I handle an user event and the event should
be out of the queue
event after it is processed. Is that right?
As the flow of the program, I think that the code inside BFormHandleEvent()
will be called first
if form B is the active form, if user goes to other form, the events will be
handle in
AppHandleUserEvent() but it doesn't happen that way. The event X and Y are
"always" handled in
AppHandleUserEvent() no matter which form is actived.
If I want Form B handles the events X and Y, I have to take out the code in
AppHandleUserEvent().
If I do that, and if the event occurs when Form B is not actived, then there
is no code to handle
those events.
Please tell me what I did wrong. How can I make a form handles certain events?
Should I put all the code to handle user events in AppHandleUserEvent() and
check for active form
to do proper things?
Thank you for any help or suggestion.
tnn
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