feat: PlayerInput now supports mouse motion through _mouse_* actions

player_input.cpp

@@ -2,6 +2,7 @@
 #include "godot_macros.h"
 #include "godot_cpp/classes/input.hpp"
 #include "godot_cpp/classes/input_event.hpp"
+#include "godot_cpp/classes/input_event_mouse_motion.hpp"
 #include <algorithm>
 
 namespace godot {
@@ -11,15 +12,40 @@ PlayerInput::Listener::Listener(String positive, String negative, Node *object,
 : actionNegative{negative}
 , actionPositive{positive}
 , methodName{method}
-, object{object} {}
+, object{object}
+, isMouseEvent{positive.begins_with("_mouse_") || negative.begins_with("_mouse_")} {}
+
+float PlayerInput::Listener::evaluate_event(Ref<InputEvent> const &event, String const &action) {
+    Input *input = Input::get_singleton();
+    if(!action.begins_with("_mouse_")) {
+        return float(input->is_action_pressed(action));
+    } else {
+        InputEventMouseMotion *motion = Object::cast_to<InputEventMouseMotion>(*event);
+        if(motion == nullptr)
+            return 0.f;
+        if(action.ends_with("_up") || action.ends_with("_right")) {
+            return motion->get_relative().x;
+        } if(action.ends_with("_right") || action.ends_with("_left")) {
+            return motion->get_relative().y;
+        }
+    }
+    return 0.f;
+}
 
 bool PlayerInput::Listener::has_changed(Ref<InputEvent> const &event) {
-    return event->is_action(this->actionNegative) || event->is_action(this->actionPositive);
+    return (
+        (!event->is_class("InputEventMouseMotion") ||
+            this->isMouseEvent
+        ) ||
+        event->is_action(this->actionNegative) ||
+        event->is_action(this->actionPositive)
+    );
 }
+
 float PlayerInput::Listener::evaluate(Ref<InputEvent> const &event) {
-    Input *input = Input::get_singleton();
+    float positive = PlayerInput::Listener::evaluate_event(event, this->actionPositive);
-    float newest = static_cast<float>(input->is_action_pressed(this->actionPositive))
+    float negative = PlayerInput::Listener::evaluate_event(event, this->actionNegative);
-                 - static_cast<float>(input->is_action_pressed(this->actionNegative));
+    float newest = positive - negative;
     if(lastCached != newest)
         this->object->call(this->methodName, event, newest);
     return (lastCached = newest);

player_input.hpp

@@ -12,13 +12,18 @@ class PlayerInput : public Node {
     static void _bind_methods();
 public:
     struct Listener {
+        friend class PlayerInput;
+    private:
         String actionNegative{""};
         String actionPositive{""};
         float lastCached{0.f};
         String methodName{""};
-        Node *object;
+        Node *object{nullptr};
+        bool isMouseEvent{false};
 
+    public:
         Listener(String positive, String negative, Node *object, String method);
+        static float evaluate_event(Ref<InputEvent> const &event, String const &action);
         bool has_changed(Ref<InputEvent> const &event);
         float evaluate(Ref<InputEvent> const &event);
         bool operator==(godot::PlayerInput::Listener const& b);