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

2 files changed, 35 insertions, 0 deletions

diff --git a/main/input_default.cpp b/main/input_default.cpp
index 18b4649f4d..fd76b91a0b 100644
--- a/main/input_default.cpp
+++ b/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;
diff --git a/main/input_default.h b/main/input_default.h
index 75dd1e67f6..79a90cc4a4 100644
--- a/main/input_default.h
+++ b/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();
 };