update asserts

examples/widgets/slider/lv_example_slider_3.c

@@ -0,0 +1,39 @@
+#include "../../../lvgl.h"
+#include <stdio.h>
+#if LV_USE_SLIDER
+
+static void slider_event_cb(lv_obj_t * slider, lv_event_t event);
+
+/**
+ * Show the current value when the slider if pressed (using only styles).
+ *
+ */
+void lv_example_slider_3(void)
+{
+    /* Create a slider in the center of the display */
+    lv_obj_t * slider;
+    slider = lv_slider_create(lv_scr_act(), NULL);
+    lv_obj_align(slider, NULL, LV_ALIGN_CENTER, 0, 0);
+    lv_obj_add_event_cb(slider, slider_event_cb, NULL);
+    lv_slider_set_type(slider, LV_SLIDER_TYPE_RANGE);
+
+    lv_slider_set_value(slider, 70, LV_ANIM_OFF);
+    lv_slider_set_left_value(slider, 20, LV_ANIM_OFF);
+
+    /*Now use only a local style.*/
+    lv_obj_set_style_content_ofs_y(slider, LV_PART_INDICATOR, LV_STATE_DEFAULT, -20);
+
+    /*To update the avlue text*/
+    lv_event_send(slider, LV_EVENT_VALUE_CHANGED, NULL);
+}
+
+static void slider_event_cb(lv_obj_t * slider, lv_event_t event)
+{
+    if(event == LV_EVENT_VALUE_CHANGED) {
+        static char buf[8];
+        lv_snprintf(buf, sizeof(buf), "%d - %d", lv_slider_get_value(slider), lv_slider_get_left_value(slider));
+        lv_obj_set_style_content_text(slider, LV_PART_INDICATOR, LV_STATE_DEFAULT, buf);
+    }
+}
+
+#endif