From 4c0cd82d9ceccf733a2492ce7e15fc75446ccbc8 Mon Sep 17 00:00:00 2001
From: Themba Dube <embeddedthemba@gmail.com>
Date: Sun, 16 Dec 2018 20:16:48 -0500
Subject: [PATCH] Initial lv_indev_set_feedback support

---
 lv_core/lv_indev.c    | 20 ++++++++++++++++++++
 lv_core/lv_indev.h    | 14 ++++++++++++++
 lv_core/lv_obj.c      |  8 ++++++++
 lv_core/lv_obj.h      |  2 ++
 lv_hal/lv_hal_indev.h |  5 +++++
 5 files changed, 49 insertions(+)

diff --git a/lv_core/lv_indev.c b/lv_core/lv_indev.c
index 1955dea44..336d046fa 100644
--- a/lv_core/lv_indev.c
+++ b/lv_core/lv_indev.c
@@ -166,6 +166,16 @@ void lv_indev_set_button_points(lv_indev_t * indev, lv_point_t * points)
     if(indev->driver.type == LV_INDEV_TYPE_BUTTON) indev->btn_points = points;
 }
 
+/**
+ * Set feedback callback for indev.
+ * @param indev pointer to an input device
+ * @param feedback feedback callback
+ */
+void lv_indev_set_feedback(lv_indev_t *indev, lv_indev_feedback_t feedback)
+{
+	indev->feedback = feedback;
+}
+
 /**
  * Get the last point of an input device (for LV_INDEV_TYPE_POINTER and LV_INDEV_TYPE_BUTTON)
  * @param indev pointer to an input device
@@ -249,6 +259,16 @@ uint32_t lv_indev_get_inactive_time(const lv_indev_t * indev)
     return t;
 }
 
+/**
+ * Get feedback callback for indev.
+ * @param indev pointer to an input device
+ * @return feedback callback
+ */
+lv_indev_feedback_t lv_indev_get_feedback(const lv_indev_t *indev)
+{
+	return indev->feedback;
+}
+
 /**
  * Do nothing until the next release
  * @param indev pointer to an input device
diff --git a/lv_core/lv_indev.h b/lv_core/lv_indev.h
index 1e7fd6bb1..68cab9a92 100644
--- a/lv_core/lv_indev.h
+++ b/lv_core/lv_indev.h
@@ -91,6 +91,13 @@ void lv_indev_set_group(lv_indev_t *indev, lv_group_t *group);
  */
 void lv_indev_set_button_points(lv_indev_t *indev, lv_point_t *points);
 
+/**
+ * Set feedback callback for indev.
+ * @param indev pointer to an input device
+ * @param feedback feedback callback
+ */
+void lv_indev_set_feedback(lv_indev_t *indev, lv_indev_feedback_t feedback);
+
 /**
  * Get the last point of an input device (for LV_INDEV_TYPE_POINTER and LV_INDEV_TYPE_BUTTON)
  * @param indev pointer to an input device
@@ -125,6 +132,13 @@ void lv_indev_get_vect(const lv_indev_t * indev, lv_point_t * point);
  */
 uint32_t lv_indev_get_inactive_time(const lv_indev_t * indev);
 
+/**
+ * Get feedback callback for indev.
+ * @param indev pointer to an input device
+ * @return feedback callback
+ */
+lv_indev_feedback_t lv_indev_get_feedback(const lv_indev_t *indev);
+
 /**
  * Do nothing until the next release
  * @param indev pointer to an input device
diff --git a/lv_core/lv_obj.c b/lv_core/lv_obj.c
index 3e576d602..12bb9027e 100644
--- a/lv_core/lv_obj.c
+++ b/lv_core/lv_obj.c
@@ -1810,6 +1810,14 @@ static lv_res_t lv_obj_signal(lv_obj_t * obj, lv_signal_t sign, void * param)
     lv_res_t res = LV_RES_OK;
 
     lv_style_t * style = lv_obj_get_style(obj);
+
+    lv_indev_t *indev_act = lv_indev_get_act();
+
+    if(sign > LV_INDEV_SIGNAL_START && sign < LV_INDEV_SIGNAL_END) {
+		if(indev_act != NULL && indev_act->feedback != NULL)
+			indev_act->feedback(indev_act, sign);
+    }
+
     if(sign == LV_SIGNAL_CHILD_CHG) {
         /*Return 'invalid' if the child change signal is not enabled*/
         if(lv_obj_is_protected(obj, LV_PROTECT_CHILD_CHG) != false) res = LV_RES_INV;
diff --git a/lv_core/lv_obj.h b/lv_core/lv_obj.h
index 6ac7170fa..619dfe37c 100644
--- a/lv_core/lv_obj.h
+++ b/lv_core/lv_obj.h
@@ -92,6 +92,7 @@ enum
     LV_SIGNAL_REFR_EXT_SIZE,
     LV_SIGNAL_GET_TYPE,
 
+	LV_INDEV_SIGNAL_START,
     /*Input device related*/
     LV_SIGNAL_PRESSED,
     LV_SIGNAL_PRESSING,
@@ -101,6 +102,7 @@ enum
     LV_SIGNAL_LONG_PRESS_REP,
     LV_SIGNAL_DRAG_BEGIN,
     LV_SIGNAL_DRAG_END,
+	LV_INDEV_SIGNAL_END,
 
     /*Group related*/
     LV_SIGNAL_FOCUS,
diff --git a/lv_hal/lv_hal_indev.h b/lv_hal/lv_hal_indev.h
index c16c55e15..c244da46c 100644
--- a/lv_hal/lv_hal_indev.h
+++ b/lv_hal/lv_hal_indev.h
@@ -19,6 +19,7 @@ extern "C" {
 #include <stdint.h>
 #include "lv_hal.h"
 #include "../lv_misc/lv_area.h"
+#include "../lv_core/lv_obj.h"
 
 /*********************
  *      DEFINES
@@ -98,6 +99,9 @@ typedef struct _lv_indev_proc_t {
     uint8_t disabled            :1;
 } lv_indev_proc_t;
 
+struct _lv_indev_t;
+
+typedef void (*lv_indev_feedback_t)(struct _lv_indev_t *, lv_signal_t);
 
 struct _lv_obj_t;
 struct _lv_group_t;
@@ -106,6 +110,7 @@ struct _lv_group_t;
 typedef struct _lv_indev_t {
     lv_indev_drv_t driver;
     lv_indev_proc_t proc;
+    lv_indev_feedback_t feedback;
     uint32_t last_activity_time;
     union {
         struct _lv_obj_t *cursor;       /*Cursor for LV_INPUT_TYPE_POINTER*/