Input: add get_connected_joysticks() method.

fixes #5465

core/os/input.cpp

@@ -59,6 +59,7 @@ void Input::_bind_methods() {
 	ObjectTypeDB::bind_method(_MD("get_joy_axis","device","axis"),&Input::get_joy_axis);
 	ObjectTypeDB::bind_method(_MD("get_joy_name","device"),&Input::get_joy_name);
 	ObjectTypeDB::bind_method(_MD("get_joy_guid","device"),&Input::get_joy_guid);
+	ObjectTypeDB::bind_method(_MD("get_connected_joysticks"),&Input::get_connected_joysticks);
 	ObjectTypeDB::bind_method(_MD("get_joy_vibration_strength", "device"), &Input::get_joy_vibration_strength);
 	ObjectTypeDB::bind_method(_MD("get_joy_vibration_duration", "device"), &Input::get_joy_vibration_duration);
 	ObjectTypeDB::bind_method(_MD("start_joy_vibration", "device", "weak_magnitude", "strong_magnitude", "duration"), &Input::start_joy_vibration, DEFVAL(0));

core/os/input.h

@@ -62,6 +62,7 @@ public:
 
 	virtual float get_joy_axis(int p_device,int p_axis)=0;
 	virtual String get_joy_name(int p_idx)=0;
+	virtual Array get_connected_joysticks()=0;
 	virtual void joy_connection_changed(int p_idx, bool p_connected, String p_name, String p_guid)=0;
 	virtual void add_joy_mapping(String p_mapping, bool p_update_existing=false)=0;
 	virtual void remove_joy_mapping(String p_guid)=0;

doc/base/classes.xml

@@ -15965,6 +15965,13 @@ Example: (content-length:12), (Content-Type:application/json; charset=UTF-8)
 			If the device has an accelerometer, this will return the movement.
 			</description>
 		</method>
+		<method name="get_connected_joysticks">
+			<return type="Array">
+			</return>
+			<description>
+			Returns an [Array] containing the device IDs of all currently connected joysticks.
+			</description>
+		</method>
 		<method name="get_joy_axis">
 			<return type="float">
 			</return>

main/input_default.cpp

@@ -101,7 +101,7 @@ bool InputDefault::is_action_pressed(const StringName& p_action) {
 
 	const List<InputEvent> *alist = InputMap::get_singleton()->get_action_list(p_action);
 	if (!alist)
-		return NULL;
+		return false;
 
 
 	for (const List<InputEvent>::Element *E=alist->front();E;E=E->next()) {
@@ -220,18 +220,18 @@ void InputDefault::joy_connection_changed(int p_idx, bool p_connected, String p_
 			};
 		};
 		js.uid = uidname;
-		//printf("looking for mappings for guid %ls\n", uidname.c_str());
+		js.connected = true;
 		int mapping = fallback_mapping;
 		for (int i=0; i < map_db.size(); i++) {
 			if (js.uid == map_db[i].uid) {
 				mapping = i;
 				js.name = map_db[i].name;
-				//printf("found mapping\n");
 			};
 		};
 		js.mapping = mapping;
 	}
 	else {
+		js.connected = false;
 		for (int i = 0; i < JOY_BUTTON_MAX; i++) {
 
 			if (i < JOY_AXIS_MAX)
@@ -1039,3 +1039,15 @@ bool InputDefault::is_joy_mapped(int p_device) {
 String InputDefault::get_joy_guid_remapped(int p_device) const {
 	return joy_names[p_device].uid;
 }
+
+Array InputDefault::get_connected_joysticks() {
+	Array ret;
+	Map<int, Joystick>::Element *elem = joy_names.front();
+	while (elem) {
+		if (elem->get().connected) {
+			ret.push_back(elem->key());
+		}
+		elem = elem->next();
+	}
+	return ret;
+}

main/input_default.h

@@ -75,6 +75,7 @@ class InputDefault : public Input {
 	struct Joystick {
 		StringName name;
 		StringName uid;
+		bool connected;
 		bool last_buttons[JOY_BUTTON_MAX + 19]; //apparently SDL specifies 35 possible buttons on android
 		float last_axis[JOY_AXIS_MAX];
 		float filter;
@@ -93,6 +94,7 @@ class InputDefault : public Input {
 
 				last_buttons[i] = false;
 			}
+			connected = false;
 			last_hat = HAT_MASK_CENTER;
 			filter = 0.01f;
 			mapping = -1;
@@ -168,6 +170,7 @@ public:
 
 	virtual float get_joy_axis(int p_device,int p_axis);
 	String get_joy_name(int p_idx);
+	virtual Array get_connected_joysticks();
 	virtual Vector2 get_joy_vibration_strength(int p_device);
 	virtual float get_joy_vibration_duration(int p_device);
 	virtual uint64_t get_joy_vibration_timestamp(int p_device);