feat(indev): add api to set gesture thresholds (#9641)

docs/src/main-modules/indev/gestures.rst

@@ -59,11 +59,14 @@ Simple gestures are always enabled and very easy to use:
 To trigger a gesture, two things need to happen. The movement needs to be:
 
 1. fast enough: the difference between the current and the previous point must be
-   greater than ``indev->gesture_min_velocity``
+   greater than Indev's ``gesture_min_velocity``
 2. large enough: the difference between the first and the current point must be
-   greater than ``indev->gesture_limit``
+   greater than Indev's ``gesture_min_distance``
 
 
+These limits can be set via :cpp:func:`lv_indev_set_gesture_min_velocity` and
+:cpp:func:`lv_indev_set_gesture_min_distance` accordingly.
+
 
 Multi-touch Gestures
 ********************

src/indev/lv_indev.c

@@ -131,17 +131,17 @@ lv_indev_t * lv_indev_create(void)
 
     indev->read_timer = lv_timer_create(lv_indev_read_timer_cb, LV_DEF_REFR_PERIOD, indev);
 
-    indev->disp                 = lv_display_get_default();
-    indev->type                 = LV_INDEV_TYPE_NONE;
-    indev->mode                 = LV_INDEV_MODE_TIMER;
-    indev->scroll_limit         = LV_INDEV_DEF_SCROLL_LIMIT;
-    indev->scroll_throw         = LV_INDEV_DEF_SCROLL_THROW;
-    indev->long_press_time      = LV_INDEV_DEF_LONG_PRESS_TIME;
-    indev->long_press_repeat_time  = LV_INDEV_DEF_LONG_PRESS_REP_TIME;
-    indev->gesture_limit        = LV_INDEV_DEF_GESTURE_LIMIT;
-    indev->gesture_min_velocity = LV_INDEV_DEF_GESTURE_MIN_VELOCITY;
-    indev->rotary_sensitivity  = LV_INDEV_DEF_ROTARY_SENSITIVITY;
-    indev->key_remap_cb         = NULL;
+    indev->disp                   = lv_display_get_default();
+    indev->type                   = LV_INDEV_TYPE_NONE;
+    indev->mode                   = LV_INDEV_MODE_TIMER;
+    indev->scroll_limit           = LV_INDEV_DEF_SCROLL_LIMIT;
+    indev->scroll_throw           = LV_INDEV_DEF_SCROLL_THROW;
+    indev->long_press_time        = LV_INDEV_DEF_LONG_PRESS_TIME;
+    indev->long_press_repeat_time = LV_INDEV_DEF_LONG_PRESS_REP_TIME;
+    indev->gesture_min_distance   = LV_INDEV_DEF_GESTURE_LIMIT;
+    indev->gesture_min_velocity   = LV_INDEV_DEF_GESTURE_MIN_VELOCITY;
+    indev->rotary_sensitivity     = LV_INDEV_DEF_ROTARY_SENSITIVITY;
+    indev->key_remap_cb           = NULL;
 #if LV_USE_EXT_DATA
     indev->ext_data.free_cb = NULL;
     indev->ext_data.data = NULL;
@@ -414,6 +414,21 @@ void lv_indev_set_scroll_throw(lv_indev_t * indev, uint8_t scroll_throw)
     indev->scroll_throw = scroll_throw;
 }
 
+void lv_indev_set_gesture_min_distance(lv_indev_t * indev, uint8_t min_distance)
+{
+
+    if(indev == NULL) return;
+
+    indev->gesture_min_distance = min_distance;
+}
+
+void lv_indev_set_gesture_min_velocity(lv_indev_t * indev, uint8_t gesture_min_velocity)
+{
+    if(indev == NULL) return;
+
+    indev->gesture_min_velocity = gesture_min_velocity;
+}
+
 void * lv_indev_get_user_data(const lv_indev_t * indev)
 {
     if(indev == NULL) return NULL;
@@ -1769,8 +1784,8 @@ void indev_gesture(lv_indev_t * indev)
     indev->pointer.gesture_sum.x += indev->pointer.vect.x;
     indev->pointer.gesture_sum.y += indev->pointer.vect.y;
 
-    if((LV_ABS(indev->pointer.gesture_sum.x) > indev_act->gesture_limit) ||
-       (LV_ABS(indev->pointer.gesture_sum.y) > indev_act->gesture_limit)) {
+    if((LV_ABS(indev->pointer.gesture_sum.x) > indev_act->gesture_min_distance) ||
+       (LV_ABS(indev->pointer.gesture_sum.y) > indev_act->gesture_min_distance)) {
 
         indev->pointer.gesture_sent = 1;
 

src/indev/lv_indev.h

@@ -193,6 +193,27 @@ void lv_indev_set_scroll_limit(lv_indev_t * indev, uint8_t scroll_limit);
  */
 void lv_indev_set_scroll_throw(lv_indev_t * indev, uint8_t scroll_throw);
 
+/**
+ * Set the minimum velocity threshold for gesture detection.
+ * The difference between consecutive points must exceed this value (in pixels)
+ * for the movement to be considered fast enough to trigger a gesture.
+ *
+ * @param indev pointer to an input device
+ * @param min_velocity minimum velocity threshold in pixels (default: 3)
+ */
+void lv_indev_set_gesture_min_velocity(lv_indev_t * indev, uint8_t min_velocity);
+
+/**
+ * Set the minimum distance threshold for gesture detection.
+ * The total distance from the first point to the current point must exceed
+ * this value (in pixels) for the movement to be considered large enough
+ * to trigger a gesture.
+ *
+ * @param indev pointer to an input device
+ * @param min_distance minimum distance threshold in pixels (default: 50)
+ */
+void lv_indev_set_gesture_min_distance(lv_indev_t * indev, uint8_t min_distance);
+
 /**
  * Get the type of an input device
  * @param indev pointer to an input device

src/indev/lv_indev_gesture.c

@@ -492,7 +492,7 @@ void lv_indev_gesture_detect_two_fingers_swipe(lv_indev_gesture_recognizer_t * r
                 to be higher than the threshold to pass it as recognized */
                 gesture_calculate_factors(r->info, 2);
                 dist = SQUARE_SUM(r->info->delta_x, r->info->delta_y);
-                if(dist > SQUARE(lv_indev_active()->gesture_limit)) {
+                if(dist > SQUARE(lv_indev_active()->gesture_min_distance)) {
                     r->state = LV_INDEV_GESTURE_STATE_RECOGNIZED;
                 }
                 break;

src/indev/lv_indev_private.h

@@ -71,11 +71,11 @@ struct _lv_indev_t {
     /**< Drag throw slow-down in [%]. Greater value means faster slow-down*/
     uint8_t scroll_throw;
 
-    /**< At least this difference should be between two points to evaluate as gesture*/
+    /**< Minimum velocity: difference between consecutive points must exceed this (in pixels) to detect gesture speed */
     uint8_t gesture_min_velocity;
 
-    /**< At least this difference should be to send a gesture*/
-    uint8_t gesture_limit;
+    /**< Minimum distance: total travel from first to current point must exceed this (in pixels) to trigger gesture */
+    uint8_t gesture_min_distance;
 
     /**< Long press time in milliseconds*/
     uint16_t long_press_time;