Add support for event accumlation (off by default, on for editor), fixes #26536

core/os/input.cpp

@@ -91,6 +91,7 @@ void Input::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_default_cursor_shape", "shape"), &Input::set_default_cursor_shape, DEFVAL(CURSOR_ARROW));
 	ClassDB::bind_method(D_METHOD("set_custom_mouse_cursor", "image", "shape", "hotspot"), &Input::set_custom_mouse_cursor, DEFVAL(CURSOR_ARROW), DEFVAL(Vector2()));
 	ClassDB::bind_method(D_METHOD("parse_input_event", "event"), &Input::parse_input_event);
+	ClassDB::bind_method(D_METHOD("set_use_accumulated_input", "enable"), &Input::set_use_accumulated_input);
 
 	BIND_ENUM_CONSTANT(MOUSE_MODE_VISIBLE);
 	BIND_ENUM_CONSTANT(MOUSE_MODE_HIDDEN);

core/os/input.h

@@ -132,6 +132,9 @@ public:
 	virtual int get_joy_axis_index_from_string(String p_axis) = 0;
 
 	virtual void parse_input_event(const Ref<InputEvent> &p_event) = 0;
+	virtual void accumulate_input_event(const Ref<InputEvent> &p_event) = 0;
+	virtual void flush_accumulated_events() = 0;
+	virtual void set_use_accumulated_input(bool p_enable) = 0;
 
 	Input();
 };

core/os/input_event.cpp

@@ -122,6 +122,8 @@ void InputEvent::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("is_action_type"), &InputEvent::is_action_type);
 
+	ClassDB::bind_method(D_METHOD("accumulate", "with_event"), &InputEvent::accumulate);
+
 	ClassDB::bind_method(D_METHOD("xformed_by", "xform", "local_ofs"), &InputEvent::xformed_by, DEFVAL(Vector2()));
 
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "device"), "set_device", "get_device");
@@ -620,6 +622,44 @@ String InputEventMouseMotion::as_text() const {
 	return "InputEventMouseMotion : button_mask=" + button_mask_string + ", position=(" + String(get_position()) + "), relative=(" + String(get_relative()) + "), speed=(" + String(get_speed()) + ")";
 }
 
+bool InputEventMouseMotion::accumulate(const Ref<InputEvent> &p_event) {
+
+	Ref<InputEventMouseMotion> motion = p_event;
+	if (motion.is_null())
+		return false;
+
+	if (is_pressed() != motion->is_pressed()) {
+		return false;
+	}
+
+	if (get_button_mask() != motion->get_button_mask()) {
+		return false;
+	}
+
+	if (get_shift() != motion->get_shift()) {
+		return false;
+	}
+
+	if (get_control() != motion->get_control()) {
+		return false;
+	}
+
+	if (get_alt() != motion->get_alt()) {
+		return false;
+	}
+
+	if (get_metakey() != motion->get_metakey()) {
+		return false;
+	}
+
+	set_position(motion->get_position());
+	set_global_position(motion->get_global_position());
+	set_speed(motion->get_speed());
+	relative += motion->get_relative();
+
+	return true;
+}
+
 void InputEventMouseMotion::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("set_relative", "relative"), &InputEventMouseMotion::set_relative);

core/os/input_event.h

@@ -186,6 +186,7 @@ public:
 	virtual bool shortcut_match(const Ref<InputEvent> &p_event) const;
 	virtual bool is_action_type() const;
 
+	virtual bool accumulate(const Ref<InputEvent> &p_event) { return false; }
 	InputEvent();
 };
 
@@ -351,6 +352,8 @@ public:
 	virtual Ref<InputEvent> xformed_by(const Transform2D &p_xform, const Vector2 &p_local_ofs = Vector2()) const;
 	virtual String as_text() const;
 
+	virtual bool accumulate(const Ref<InputEvent> &p_event);
+
 	InputEventMouseMotion();
 };
 

editor/editor_node.cpp

@@ -4850,6 +4850,7 @@ void EditorNode::_print_handler(void *p_this, const String &p_string, bool p_err
 
 EditorNode::EditorNode() {
 
+	Input::get_singleton()->set_use_accumulated_input(true);
 	Resource::_get_local_scene_func = _resource_get_edited_scene;
 
 	VisualServer::get_singleton()->textures_keep_original(true);

main/input_default.cpp

@@ -657,8 +657,35 @@ void InputDefault::set_mouse_in_window(bool p_in_window) {
 	*/
 }
 
+void InputDefault::accumulate_input_event(const Ref<InputEvent> &p_event) {
+	ERR_FAIL_COND(p_event.is_null());
+
+	if (!use_accumulated_input) {
+		parse_input_event(p_event);
+		return;
+	}
+	if (!accumulated_events.empty() && accumulated_events.back()->get()->accumulate(p_event)) {
+		return; //event was accumulated, exit
+	}
+
+	accumulated_events.push_back(p_event);
+}
+void InputDefault::flush_accumulated_events() {
+
+	while (accumulated_events.front()) {
+		parse_input_event(accumulated_events.front()->get());
+		accumulated_events.pop_front();
+	}
+}
+
+void InputDefault::set_use_accumulated_input(bool p_enable) {
+
+	use_accumulated_input = p_enable;
+}
+
 InputDefault::InputDefault() {
 
+	use_accumulated_input = false;
 	mouse_button_mask = 0;
 	emulate_touch_from_mouse = false;
 	emulate_mouse_from_touch = false;

main/input_default.h

@@ -183,6 +183,9 @@ private:
 
 	void _parse_input_event_impl(const Ref<InputEvent> &p_event, bool p_is_emulated);
 
+	List<Ref<InputEvent> > accumulated_events;
+	bool use_accumulated_input;
+
 public:
 	virtual bool is_key_pressed(int p_scancode) const;
 	virtual bool is_mouse_button_pressed(int p_button) const;
@@ -264,6 +267,11 @@ public:
 	bool is_joy_mapped(int p_device);
 	String get_joy_guid_remapped(int p_device) const;
 	void set_fallback_mapping(String p_guid);
+
+	virtual void accumulate_input_event(const Ref<InputEvent> &p_event);
+	virtual void flush_accumulated_events();
+	virtual void set_use_accumulated_input(bool p_enable);
+
 	InputDefault();
 };
 

platform/osx/os_osx.mm

@@ -2529,6 +2529,8 @@ void OS_OSX::process_events() {
 
 	[autoreleasePool drain];
 	autoreleasePool = [[NSAutoreleasePool alloc] init];
+
+	input->flush_accumulated_events();
 }
 
 void OS_OSX::process_key_events() {
@@ -2571,13 +2573,14 @@ void OS_OSX::process_key_events() {
 void OS_OSX::push_input(const Ref<InputEvent> &p_event) {
 
 	Ref<InputEvent> ev = p_event;
-	input->parse_input_event(ev);
+	input->accumulate_input_event(ev);
 }
 
 void OS_OSX::force_process_input() {
 
 	process_events(); // get rid of pending events
 	joypad_osx->process_joypads();
+
 }
 
 void OS_OSX::run() {

platform/windows/os_windows.cpp

@@ -271,7 +271,7 @@ void OS_Windows::_touch_event(bool p_pressed, float p_x, float p_y, int idx) {
 	event->set_position(Vector2(p_x, p_y));
 
 	if (main_loop) {
-		input->parse_input_event(event);
+		input->accumulate_input_event(event);
 	}
 };
 
@@ -293,7 +293,7 @@ void OS_Windows::_drag_event(float p_x, float p_y, int idx) {
 	event->set_position(Vector2(p_x, p_y));
 
 	if (main_loop)
-		input->parse_input_event(event);
+		input->accumulate_input_event(event);
 };
 
 LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
@@ -458,7 +458,7 @@ LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 				}
 
 				if (window_has_focus && main_loop && mm->get_relative() != Vector2())
-					input->parse_input_event(mm);
+					input->accumulate_input_event(mm);
 			}
 			delete[] lpb;
 		} break;
@@ -545,7 +545,7 @@ LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 			old_x = mm->get_position().x;
 			old_y = mm->get_position().y;
 			if (window_has_focus && main_loop)
-				input->parse_input_event(mm);
+				input->accumulate_input_event(mm);
 
 		} break;
 		case WM_LBUTTONDOWN:
@@ -718,14 +718,14 @@ LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 			mb->set_global_position(mb->get_position());
 
 			if (main_loop) {
-				input->parse_input_event(mb);
+				input->accumulate_input_event(mb);
 				if (mb->is_pressed() && mb->get_button_index() > 3 && mb->get_button_index() < 8) {
 					//send release for mouse wheel
 					Ref<InputEventMouseButton> mbd = mb->duplicate();
 					last_button_state &= ~(1 << (mbd->get_button_index() - 1));
 					mbd->set_button_mask(last_button_state);
 					mbd->set_pressed(false);
-					input->parse_input_event(mbd);
+					input->accumulate_input_event(mbd);
 				}
 			}
 		} break;
@@ -988,7 +988,7 @@ void OS_Windows::process_key_events() {
 					if (k->get_unicode() < 32)
 						k->set_unicode(0);
 
-					input->parse_input_event(k);
+					input->accumulate_input_event(k);
 				}
 
 				//do nothing
@@ -1026,7 +1026,7 @@ void OS_Windows::process_key_events() {
 
 				k->set_echo((ke.uMsg == WM_KEYDOWN && (ke.lParam & (1 << 30))));
 
-				input->parse_input_event(k);
+				input->accumulate_input_event(k);
 
 			} break;
 		}
@@ -2252,6 +2252,7 @@ void OS_Windows::process_events() {
 
 	if (!drop_events) {
 		process_key_events();
+		input->flush_accumulated_events();
 	}
 }
 

platform/x11/os_x11.cpp

@@ -1660,7 +1660,7 @@ void OS_X11::handle_key_event(XKeyEvent *p_event, bool p_echo) {
 					k->set_shift(true);
 				}
 
-				input->parse_input_event(k);
+				input->accumulate_input_event(k);
 			}
 			return;
 		}
@@ -1804,7 +1804,7 @@ void OS_X11::handle_key_event(XKeyEvent *p_event, bool p_echo) {
 	}
 
 	//printf("key: %x\n",k->get_scancode());
-	input->parse_input_event(k);
+	input->accumulate_input_event(k);
 }
 
 struct Property {
@@ -1991,12 +1991,12 @@ void OS_X11::process_xevents() {
 								// in a spurious mouse motion event being sent to Godot; remember it to be able to filter it out
 								xi.mouse_pos_to_filter = pos;
 							}
-							input->parse_input_event(st);
+							input->accumulate_input_event(st);
 						} else {
 							if (!xi.state.has(index)) // Defensive
 								break;
 							xi.state.erase(index);
-							input->parse_input_event(st);
+							input->accumulate_input_event(st);
 						}
 					} break;
 
@@ -2014,7 +2014,7 @@ void OS_X11::process_xevents() {
 							sd->set_index(index);
 							sd->set_position(pos);
 							sd->set_relative(pos - curr_pos_elem->value());
-							input->parse_input_event(sd);
+							input->accumulate_input_event(sd);
 
 							curr_pos_elem->value() = pos;
 						}
@@ -2102,7 +2102,7 @@ void OS_X11::process_xevents() {
 					st.instance();
 					st->set_index(E->key());
 					st->set_position(E->get());
-					input->parse_input_event(st);
+					input->accumulate_input_event(st);
 				}
 				xi.state.clear();
 #endif
@@ -2163,7 +2163,7 @@ void OS_X11::process_xevents() {
 					}
 				}
 
-				input->parse_input_event(mb);
+				input->accumulate_input_event(mb);
 
 			} break;
 			case MotionNotify: {
@@ -2273,7 +2273,7 @@ void OS_X11::process_xevents() {
 				// this is so that the relative motion doesn't get messed up
 				// after we regain focus.
 				if (window_has_focus || !mouse_mode_grab)
-					input->parse_input_event(mm);
+					input->accumulate_input_event(mm);
 
 			} break;
 			case KeyPress:
@@ -2457,6 +2457,8 @@ void OS_X11::process_xevents() {
 		printf("Win: %d,%d\n", win_x, win_y);
 		*/
 	}
+
+	input->flush_accumulated_events();
 }
 
 MainLoop *OS_X11::get_main_loop() const {