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Warn users about unsafe usage of InputEvent

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This commit is contained in:
Pedro J. Estébanez 2023-01-19 13:18:34 +01:00
parent 14fdd28de9
commit a2af839a59
2 changed files with 29 additions and 0 deletions
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25
core/input/input.cpp
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@ -878,6 +878,31 @@ void Input::parse_input_event(const Ref<InputEvent> &p_event) {
ERR_FAIL_COND(p_event.is_null());
#ifdef DEBUG_ENABLED
uint64_t curr_frame = Engine::get_singleton()->get_process_frames();
if (curr_frame != last_parsed_frame) {
frame_parsed_events.clear();
last_parsed_frame = curr_frame;
frame_parsed_events.insert(p_event);
} else if (frame_parsed_events.has(p_event)) {
// It would be technically safe to send the same event in cases such as:
// - After an explicit flush.
// - In platforms using buffering when agile flushing is enabled, after one of the mid-frame flushes.
// - If platform doesn't use buffering and event accumulation is disabled.
// - If platform doesn't use buffering and the event type is not accumulable.
// However, it wouldn't be reasonable to ask users to remember the full ruleset and be aware at all times
// of the possibilites of the target platform, project settings and engine internals, which may change
// without prior notice.
// Therefore, the guideline is, "don't send the same event object more than once per frame".
WARN_PRINT_ONCE(
"An input event object is being parsed more than once in the same frame, which is unsafe.\n"
"If you are generating events in a script, you have to instantiate a new event instead of sending the same one more than once, unless the original one was sent on an earlier frame.\n"
"You can call duplicate() on the event to get a new instance with identical values.");
} else {
frame_parsed_events.insert(p_event);
}
#endif
if (use_accumulated_input) {
if (buffered_events.is_empty() || !buffered_events.back()->get()->accumulate(p_event)) {
buffered_events.push_back(p_event);

4
core/input/input.h
View file

@ -222,6 +222,10 @@ private:
void _parse_input_event_impl(const Ref<InputEvent> &p_event, bool p_is_emulated);
List<Ref<InputEvent>> buffered_events;
#ifdef DEBUG_ENABLED
HashSet<Ref<InputEvent>> frame_parsed_events;
uint64_t last_parsed_frame = UINT64_MAX;
#endif
friend class DisplayServer;