Analog button should have values from 0.0 to 1.0 instead of only digital value. (#134)

https://www.w3.org/TR/gamepad/#dom-gamepadbutton-value

value attribute
For buttons that have an analog sensor, this property MUST represent the amount which the button has been pressed. All button values MUST be linearly normalized to the range [0.0 .. 1.0]. 0.0 MUST mean fully unpressed, and 1.0 MUST mean fully pressed. For buttons without an analog sensor, only the values 0.0 and 1.0 for fully unpressed and fully pressed respectively, MUST be provided.

Co-authored-by: Ganesh prasad Sahu <GaneshPrasad_Sahu@comcast.com>

Author: ganeshprasads

include/wpe/gamepad.h

@@ -140,6 +140,7 @@ struct wpe_gamepad_provider_client_interface {
 struct wpe_gamepad_client_interface {
     void (*button_changed)(void*, enum wpe_gamepad_button, bool);
     void (*axis_changed)(void*, enum wpe_gamepad_axis, double);
+    void (*analog_button_changed)(void*, enum wpe_gamepad_button, double);
 
     /*< private >*/
     void (*_wpe_reserved1)(void);
@@ -358,6 +359,20 @@ void wpe_gamepad_set_client(struct wpe_gamepad*, const struct wpe_gamepad_client
 WPE_EXPORT
 const char* wpe_gamepad_get_id(struct wpe_gamepad*);
 
+/**
+ * wpe_gamepad_dispatch_analog_button_changed:
+ * @gamepad: opaque gamepad object.
+ * @button: the analog button that changed its value.
+ * @value: the new analog @button value.
+ *
+ * Method called by application (gamepad implementator). It reports to
+ * WPEWebkit a change in the value  of analog @button.
+ *
+ * Since: 1.16
+ */
+WPE_EXPORT
+void wpe_gamepad_dispatch_analog_button_changed(struct wpe_gamepad*, enum wpe_gamepad_button, double);
+
 /**
  * wpe_gamepad_dispatch_button_changed:
  * @gamepad: opaque gamepad object.

src/gamepad.c

@@ -161,6 +161,13 @@ wpe_gamepad_get_id(struct wpe_gamepad* gamepad)
     return "Unknown device";
 }
 
+void
+wpe_gamepad_dispatch_analog_button_changed(struct wpe_gamepad* gamepad, enum wpe_gamepad_button button, double value)
+{
+    if (gamepad && gamepad->client_interface && gamepad->client_interface->analog_button_changed)
+        gamepad->client_interface->analog_button_changed(gamepad->client_data, button, value);
+}
+
 void
 wpe_gamepad_dispatch_button_changed(struct wpe_gamepad* gamepad, enum wpe_gamepad_button button, bool pressed)
 {