Add methods to check which event first triggered "just pressed/released" state.

core/input/input.cpp

@@ -123,6 +123,8 @@ void Input::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("is_action_pressed", "action", "exact_match"), &Input::is_action_pressed, DEFVAL(false));
 	ClassDB::bind_method(D_METHOD("is_action_just_pressed", "action", "exact_match"), &Input::is_action_just_pressed, DEFVAL(false));
 	ClassDB::bind_method(D_METHOD("is_action_just_released", "action", "exact_match"), &Input::is_action_just_released, DEFVAL(false));
+	ClassDB::bind_method(D_METHOD("is_action_just_pressed_by_event", "action", "event", "exact_match"), &Input::is_action_just_pressed_by_event, DEFVAL(false));
+	ClassDB::bind_method(D_METHOD("is_action_just_released_by_event", "action", "event", "exact_match"), &Input::is_action_just_released_by_event, DEFVAL(false));
 	ClassDB::bind_method(D_METHOD("get_action_strength", "action", "exact_match"), &Input::get_action_strength, DEFVAL(false));
 	ClassDB::bind_method(D_METHOD("get_action_raw_strength", "action", "exact_match"), &Input::get_action_raw_strength, DEFVAL(false));
 	ClassDB::bind_method(D_METHOD("get_axis", "negative_action", "positive_action"), &Input::get_axis);
@@ -411,6 +413,37 @@ bool Input::is_action_just_pressed(const StringName &p_action, bool p_exact) con
 	}
 }
 
+bool Input::is_action_just_pressed_by_event(const StringName &p_action, const Ref<InputEvent> &p_event, bool p_exact) const {
+	ERR_FAIL_COND_V_MSG(!InputMap::get_singleton()->has_action(p_action), false, InputMap::get_singleton()->suggest_actions(p_action));
+	ERR_FAIL_COND_V(p_event.is_null(), false);
+
+	if (disable_input) {
+		return false;
+	}
+
+	HashMap<StringName, ActionState>::ConstIterator E = action_states.find(p_action);
+	if (!E) {
+		return false;
+	}
+
+	if (p_exact && E->value.exact == false) {
+		return false;
+	}
+
+	if (E->value.pressed_event_id != p_event->get_instance_id()) {
+		return false;
+	}
+
+	// Backward compatibility for legacy behavior, only return true if currently pressed.
+	bool pressed_requirement = legacy_just_pressed_behavior ? E->value.cache.pressed : true;
+
+	if (Engine::get_singleton()->is_in_physics_frame()) {
+		return pressed_requirement && E->value.pressed_physics_frame == Engine::get_singleton()->get_physics_frames();
+	} else {
+		return pressed_requirement && E->value.pressed_process_frame == Engine::get_singleton()->get_process_frames();
+	}
+}
+
 bool Input::is_action_just_released(const StringName &p_action, bool p_exact) const {
 	ERR_FAIL_COND_V_MSG(!InputMap::get_singleton()->has_action(p_action), false, InputMap::get_singleton()->suggest_actions(p_action));
 
@@ -437,6 +470,37 @@ bool Input::is_action_just_released(const StringName &p_action, bool p_exact) co
 	}
 }
 
+bool Input::is_action_just_released_by_event(const StringName &p_action, const Ref<InputEvent> &p_event, bool p_exact) const {
+	ERR_FAIL_COND_V_MSG(!InputMap::get_singleton()->has_action(p_action), false, InputMap::get_singleton()->suggest_actions(p_action));
+	ERR_FAIL_COND_V(p_event.is_null(), false);
+
+	if (disable_input) {
+		return false;
+	}
+
+	HashMap<StringName, ActionState>::ConstIterator E = action_states.find(p_action);
+	if (!E) {
+		return false;
+	}
+
+	if (p_exact && E->value.exact == false) {
+		return false;
+	}
+
+	if (E->value.released_event_id != p_event->get_instance_id()) {
+		return false;
+	}
+
+	// Backward compatibility for legacy behavior, only return true if currently released.
+	bool released_requirement = legacy_just_pressed_behavior ? !E->value.cache.pressed : true;
+
+	if (Engine::get_singleton()->is_in_physics_frame()) {
+		return released_requirement && E->value.released_physics_frame == Engine::get_singleton()->get_physics_frames();
+	} else {
+		return released_requirement && E->value.released_process_frame == Engine::get_singleton()->get_process_frames();
+	}
+}
+
 float Input::get_action_strength(const StringName &p_action, bool p_exact) const {
 	ERR_FAIL_COND_V_MSG(!InputMap::get_singleton()->has_action(p_action), 0.0, InputMap::get_singleton()->suggest_actions(p_action));
 
@@ -895,10 +959,12 @@ void Input::_parse_input_event_impl(const Ref<InputEvent> &p_event, bool p_is_em
 		_update_action_cache(E.key, action_state);
 		// As input may come in part way through a physics tick, the earliest we can react to it is the next physics tick.
 		if (action_state.cache.pressed && !was_pressed) {
+			action_state.pressed_event_id = p_event->get_instance_id();
 			action_state.pressed_physics_frame = Engine::get_singleton()->get_physics_frames() + 1;
 			action_state.pressed_process_frame = Engine::get_singleton()->get_process_frames();
 		}
 		if (!action_state.cache.pressed && was_pressed) {
+			action_state.released_event_id = p_event->get_instance_id();
 			action_state.released_physics_frame = Engine::get_singleton()->get_physics_frames() + 1;
 			action_state.released_process_frame = Engine::get_singleton()->get_process_frames();
 		}
@@ -1027,6 +1093,7 @@ void Input::action_press(const StringName &p_action, float p_strength) {
 
 	// As input may come in part way through a physics tick, the earliest we can react to it is the next physics tick.
 	if (!action_state.cache.pressed) {
+		action_state.pressed_event_id = ObjectID();
 		action_state.pressed_physics_frame = Engine::get_singleton()->get_physics_frames() + 1;
 		action_state.pressed_process_frame = Engine::get_singleton()->get_process_frames();
 	}
@@ -1045,6 +1112,7 @@ void Input::action_release(const StringName &p_action) {
 	action_state.cache.strength = 0.0;
 	action_state.cache.raw_strength = 0.0;
 	// As input may come in part way through a physics tick, the earliest we can react to it is the next physics tick.
+	action_state.released_event_id = ObjectID();
 	action_state.released_physics_frame = Engine::get_singleton()->get_physics_frames() + 1;
 	action_state.released_process_frame = Engine::get_singleton()->get_process_frames();
 	action_state.device_states.clear();

core/input/input.h

@@ -109,6 +109,8 @@ private:
 		uint64_t pressed_process_frame = UINT64_MAX;
 		uint64_t released_physics_frame = UINT64_MAX;
 		uint64_t released_process_frame = UINT64_MAX;
+		ObjectID pressed_event_id;
+		ObjectID released_event_id;
 		bool exact = true;
 
 		struct DeviceState {
@@ -306,6 +308,8 @@ public:
 	bool is_action_pressed(const StringName &p_action, bool p_exact = false) const;
 	bool is_action_just_pressed(const StringName &p_action, bool p_exact = false) const;
 	bool is_action_just_released(const StringName &p_action, bool p_exact = false) const;
+	bool is_action_just_pressed_by_event(const StringName &p_action, const Ref<InputEvent> &p_event, bool p_exact = false) const;
+	bool is_action_just_released_by_event(const StringName &p_action, const Ref<InputEvent> &p_event, bool p_exact = false) const;
 	float get_action_strength(const StringName &p_action, bool p_exact = false) const;
 	float get_action_raw_strength(const StringName &p_action, bool p_exact = false) const;
 

doc/classes/Input.xml

@@ -212,7 +212,20 @@
 				If [param exact_match] is [code]false[/code], it ignores additional input modifiers for [InputEventKey] and [InputEventMouseButton] events, and the direction for [InputEventJoypadMotion] events.
 				[b]Note:[/b] Returning [code]true[/code] does not imply that the action is [i]still[/i] pressed. An action can be pressed and released again rapidly, and [code]true[/code] will still be returned so as not to miss input.
 				[b]Note:[/b] Due to keyboard ghosting, [method is_action_just_pressed] may return [code]false[/code] even if one of the action's keys is pressed. See [url=$DOCS_URL/tutorials/inputs/input_examples.html#keyboard-events]Input examples[/url] in the documentation for more information.
-				[b]Note:[/b] During input handling (e.g. [method Node._input]), use [method InputEvent.is_action_pressed] instead to query the action state of the current event.
+				[b]Note:[/b] During input handling (e.g. [method Node._input]), use [method InputEvent.is_action_pressed] instead to query the action state of the current event. See also [method is_action_just_pressed_by_event].
+			</description>
+		</method>
+		<method name="is_action_just_pressed_by_event" qualifiers="const">
+			<return type="bool" />
+			<param index="0" name="action" type="StringName" />
+			<param index="1" name="event" type="InputEvent" />
+			<param index="2" name="exact_match" type="bool" default="false" />
+			<description>
+				Returns [code]true[/code] when the user has [i]started[/i] pressing the action event in the current frame or physics tick, and the first event that triggered action press in the current frame/physics tick was [param event]. It will only return [code]true[/code] on the frame or tick that the user pressed down the button.
+				This is useful for code that needs to run only once when an action is pressed, and the action is processed during input handling (e.g. [method Node._input]).
+				If [param exact_match] is [code]false[/code], it ignores additional input modifiers for [InputEventKey] and [InputEventMouseButton] events, and the direction for [InputEventJoypadMotion] events.
+				[b]Note:[/b] Returning [code]true[/code] does not imply that the action is [i]still[/i] pressed. An action can be pressed and released again rapidly, and [code]true[/code] will still be returned so as not to miss input.
+				[b]Note:[/b] Due to keyboard ghosting, [method is_action_just_pressed] may return [code]false[/code] even if one of the action's keys is pressed. See [url=$DOCS_URL/tutorials/inputs/input_examples.html#keyboard-events]Input examples[/url] in the documentation for more information.
 			</description>
 		</method>
 		<method name="is_action_just_released" qualifiers="const">
@@ -223,7 +236,19 @@
 				Returns [code]true[/code] when the user [i]stops[/i] pressing the action event in the current frame or physics tick. It will only return [code]true[/code] on the frame or tick that the user releases the button.
 				[b]Note:[/b] Returning [code]true[/code] does not imply that the action is [i]still[/i] not pressed. An action can be released and pressed again rapidly, and [code]true[/code] will still be returned so as not to miss input.
 				If [param exact_match] is [code]false[/code], it ignores additional input modifiers for [InputEventKey] and [InputEventMouseButton] events, and the direction for [InputEventJoypadMotion] events.
-				[b]Note:[/b] During input handling (e.g. [method Node._input]), use [method InputEvent.is_action_released] instead to query the action state of the current event.
+				[b]Note:[/b] During input handling (e.g. [method Node._input]), use [method InputEvent.is_action_released] instead to query the action state of the current event. See also [method is_action_just_released_by_event].
+			</description>
+		</method>
+		<method name="is_action_just_released_by_event" qualifiers="const">
+			<return type="bool" />
+			<param index="0" name="action" type="StringName" />
+			<param index="1" name="event" type="InputEvent" />
+			<param index="2" name="exact_match" type="bool" default="false" />
+			<description>
+				Returns [code]true[/code] when the user [i]stops[/i] pressing the action event in the current frame or physics tick, and the first event that triggered action release in the current frame/physics tick was [param event]. It will only return [code]true[/code] on the frame or tick that the user releases the button.
+				This is useful when an action is processed during input handling (e.g. [method Node._input]).
+				[b]Note:[/b] Returning [code]true[/code] does not imply that the action is [i]still[/i] not pressed. An action can be released and pressed again rapidly, and [code]true[/code] will still be returned so as not to miss input.
+				If [param exact_match] is [code]false[/code], it ignores additional input modifiers for [InputEventKey] and [InputEventMouseButton] events, and the direction for [InputEventJoypadMotion] events.
 			</description>
 		</method>
 		<method name="is_action_pressed" qualifiers="const">

scene/gui/popup_menu.cpp

@@ -483,7 +483,7 @@ void PopupMenu::_input_from_window_internal(const Ref<InputEvent> &p_event) {
 		}
 		if (p_event->is_action("ui_down", true) && p_event->is_pressed()) {
 			if (is_joypad_event) {
-				if (!input->is_action_just_pressed("ui_down", true)) {
+				if (!input->is_action_just_pressed_by_event("ui_down", p_event, true)) {
 					return;
 				}
 				joypad_event_process = true;
@@ -526,7 +526,7 @@ void PopupMenu::_input_from_window_internal(const Ref<InputEvent> &p_event) {
 			}
 		} else if (p_event->is_action("ui_up", true) && p_event->is_pressed()) {
 			if (is_joypad_event) {
-				if (!input->is_action_just_pressed("ui_up", true)) {
+				if (!input->is_action_just_pressed_by_event("ui_up", p_event, true)) {
 					return;
 				}
 				joypad_event_process = true;

scene/gui/slider.cpp

@@ -136,7 +136,7 @@ void Slider::gui_input(const Ref<InputEvent> &p_event) {
 				return;
 			}
 			if (is_joypad_event) {
-				if (!input->is_action_just_pressed("ui_left", true)) {
+				if (!input->is_action_just_pressed_by_event("ui_left", p_event, true)) {
 					return;
 				}
 				set_process_internal(true);
@@ -152,7 +152,7 @@ void Slider::gui_input(const Ref<InputEvent> &p_event) {
 				return;
 			}
 			if (is_joypad_event) {
-				if (!input->is_action_just_pressed("ui_right", true)) {
+				if (!input->is_action_just_pressed_by_event("ui_right", p_event, true)) {
 					return;
 				}
 				set_process_internal(true);
@@ -168,7 +168,7 @@ void Slider::gui_input(const Ref<InputEvent> &p_event) {
 				return;
 			}
 			if (is_joypad_event) {
-				if (!input->is_action_just_pressed("ui_up", true)) {
+				if (!input->is_action_just_pressed_by_event("ui_up", p_event, true)) {
 					return;
 				}
 				set_process_internal(true);
@@ -180,7 +180,7 @@ void Slider::gui_input(const Ref<InputEvent> &p_event) {
 				return;
 			}
 			if (is_joypad_event) {
-				if (!input->is_action_just_pressed("ui_down", true)) {
+				if (!input->is_action_just_pressed_by_event("ui_down", p_event, true)) {
 					return;
 				}
 				set_process_internal(true);

scene/gui/tab_bar.cpp

@@ -315,7 +315,7 @@ void TabBar::gui_input(const Ref<InputEvent> &p_event) {
 		bool is_joypad_event = (joypadmotion_event.is_valid() || joypadbutton_event.is_valid());
 		if (p_event->is_action("ui_right", true)) {
 			if (is_joypad_event) {
-				if (!input->is_action_just_pressed("ui_right", true)) {
+				if (!input->is_action_just_pressed_by_event("ui_right", p_event, true)) {
 					return;
 				}
 				set_process_internal(true);
@@ -325,7 +325,7 @@ void TabBar::gui_input(const Ref<InputEvent> &p_event) {
 			}
 		} else if (p_event->is_action("ui_left", true)) {
 			if (is_joypad_event) {
-				if (!input->is_action_just_pressed("ui_left", true)) {
+				if (!input->is_action_just_pressed_by_event("ui_left", p_event, true)) {
 					return;
 				}
 				set_process_internal(true);

scene/main/viewport.cpp

@@ -2301,15 +2301,15 @@ void Viewport::_gui_input_event(Ref<InputEvent> p_event) {
 			if (joypadmotion_event.is_valid()) {
 				Input *input = Input::get_singleton();
 
-				if (p_event->is_action_pressed(SNAME("ui_focus_next")) && input->is_action_just_pressed(SNAME("ui_focus_next"))) {
+				if (p_event->is_action_pressed(SNAME("ui_focus_next")) && input->is_action_just_pressed_by_event(SNAME("ui_focus_next"), p_event)) {
 					next = from->find_next_valid_focus();
 				}
 
-				if (p_event->is_action_pressed(SNAME("ui_focus_prev")) && input->is_action_just_pressed(SNAME("ui_focus_prev"))) {
+				if (p_event->is_action_pressed(SNAME("ui_focus_prev")) && input->is_action_just_pressed_by_event(SNAME("ui_focus_prev"), p_event)) {
 					next = from->find_prev_valid_focus();
 				}
 
-				if (p_event->is_action_pressed(SNAME("ui_accessibility_drag_and_drop")) && input->is_action_just_pressed(SNAME("ui_accessibility_drag_and_drop"))) {
+				if (p_event->is_action_pressed(SNAME("ui_accessibility_drag_and_drop")) && input->is_action_just_pressed_by_event(SNAME("ui_accessibility_drag_and_drop"), p_event)) {
 					if (gui_is_dragging()) {
 						from->accessibility_drop();
 					} else {
@@ -2317,19 +2317,19 @@ void Viewport::_gui_input_event(Ref<InputEvent> p_event) {
 					}
 				}
 
-				if (p_event->is_action_pressed(SNAME("ui_up")) && input->is_action_just_pressed(SNAME("ui_up"))) {
+				if (p_event->is_action_pressed(SNAME("ui_up")) && input->is_action_just_pressed_by_event(SNAME("ui_up"), p_event)) {
 					next = from->_get_focus_neighbor(SIDE_TOP);
 				}
 
-				if (p_event->is_action_pressed(SNAME("ui_left")) && input->is_action_just_pressed(SNAME("ui_left"))) {
+				if (p_event->is_action_pressed(SNAME("ui_left")) && input->is_action_just_pressed_by_event(SNAME("ui_left"), p_event)) {
 					next = from->_get_focus_neighbor(SIDE_LEFT);
 				}
 
-				if (p_event->is_action_pressed(SNAME("ui_right")) && input->is_action_just_pressed(SNAME("ui_right"))) {
+				if (p_event->is_action_pressed(SNAME("ui_right")) && input->is_action_just_pressed_by_event(SNAME("ui_right"), p_event)) {
 					next = from->_get_focus_neighbor(SIDE_RIGHT);
 				}
 
-				if (p_event->is_action_pressed(SNAME("ui_down")) && input->is_action_just_pressed(SNAME("ui_down"))) {
+				if (p_event->is_action_pressed(SNAME("ui_down")) && input->is_action_just_pressed_by_event(SNAME("ui_down"), p_event)) {
 					next = from->_get_focus_neighbor(SIDE_BOTTOM);
 				}
 			} else {