bool has_focus(const handler* hand, const SDL_Event* event)
{
if(event_contexts.empty()) {
return true;
}
if(hand->requires_event_focus(event) == false) {
return true;
}
const int foc_i = event_contexts.back().focused_handler;
//if no-one has focus at the moment, this handler obviously wants
//focus, so give it to it.
if(foc_i == -1) {
focus_handler(hand);
return true;
}
handler *const foc_hand = event_contexts.back().handlers[foc_i];
if(foc_hand == hand){
return true;
} else if(!foc_hand->requires_event_focus(event)) {
//if the currently focused handler doesn't need focus for this event
//allow the most recent interested handler to take care of it
int back_i = event_contexts.back().handlers.size() - 1;
for(int i=back_i; i>=0; --i) {
handler *const thief_hand = event_contexts.back().handlers[i];
if(i != foc_i && thief_hand->requires_event_focus(event)) {
//steal focus
focus_handler(thief_hand);
if(foc_i < back_i) {
//position the previously focused handler to allow stealing back
event_contexts.back().delete_handler_index(foc_i);
event_contexts.back().add_handler(foc_hand);
}
return thief_hand == hand;
}
}
}
return false;
}
bool has_focus(const sdl_handler* hand, const SDL_Event* event)
{
if(event_contexts.empty()) {
return true;
}
if(hand->requires_event_focus(event) == false) {
return true;
}
const handler_list::iterator foc = event_contexts.back().focused_handler;
auto& handlers = event_contexts.back().handlers;
// If no-one has focus at the moment, this handler obviously wants
// focus, so give it to it.
if(foc == handlers.end()) {
focus_handler(hand);
return true;
}
sdl_handler* const foc_hand = *foc;
if(foc_hand == hand){
return true;
} else if(!foc_hand->requires_event_focus(event)) {
// If the currently focused handler doesn't need focus for this event
// allow the most recent interested handler to take care of it
for(auto i = handlers.rbegin(); i != handlers.rend(); ++i) {
sdl_handler* const thief_hand = *i;
if(thief_hand != foc_hand && thief_hand->requires_event_focus(event)) {
// Steal focus
focus_handler(thief_hand);
// Position the previously focused handler to allow stealing back
handlers.splice(handlers.end(), handlers, foc);
return thief_hand == hand;
}
}
}
return false;
}
