void
EventDispatcher::RemoveTemporaryListener(EventTarget& target, int32 token)
{
BAutolock _(this);
ETRACE(("events: remove temporary listener token %ld\n", token));
if (target.RemoveTemporaryListener(token) && target.IsEmpty())
fTargets.RemoveItem(&target);
}
/*!
\brief Adds the specified listener or updates its event mask and options
if already added.
It follows the BView semantics in that specifiying an event mask of zero
leaves the event mask untouched and just updates the options.
*/
bool
EventDispatcher::_AddListener(EventTarget& target, int32 token,
uint32 eventMask, uint32 options, bool temporary)
{
BAutolock _(this);
if (temporary && fLastButtons == 0) {
// only allow to add temporary listeners in case a buttons is pressed
return false;
}
if (!fTargets.HasItem(&target))
fTargets.AddItem(&target);
event_listener* listener = target.FindListener(token);
if (listener != NULL) {
// we already have this target, update its event mask
if (temporary) {
if (eventMask != 0)
listener->temporary_event_mask = eventMask;
listener->temporary_options = options;
} else {
if (eventMask != 0)
listener->event_mask = eventMask;
listener->options = options;
}
return true;
}
if (eventMask == 0)
return false;
ETRACE(("events: add listener: token %ld, eventMask = %ld, options = %ld, %s\n",
token, eventMask, options, temporary ? "temporary" : "permanent"));
// we need a new target
bool success = target.AddListener(token, eventMask, options, temporary);
if (!success) {
if (target.IsEmpty())
fTargets.RemoveItem(&target);
} else {
if (options & B_SUSPEND_VIEW_FOCUS)
fSuspendFocus = true;
}
return success;
}