update asserts

examples/widgets/slider/lv_example_slider_1.c

@@ -0,0 +1,35 @@
+#include "../../../lvgl.h"
+#include <stdio.h>
+#if LV_USE_SLIDER
+
+static void slider_event_cb(lv_obj_t * slider, lv_event_t event);
+static lv_obj_t * slider_label;
+
+/**
+ * A default slider with a label displaying the current value
+ */
+void lv_example_slider_1(void)
+{
+    /* Create a slider in the center of the display */
+    lv_obj_t * 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);
+
+    /* Create a label below the slider */
+    slider_label = lv_label_create(lv_scr_act(), NULL);
+    lv_label_set_text(slider_label, "0%");
+
+    lv_obj_align(slider_label, slider, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);
+}
+
+static void slider_event_cb(lv_obj_t * slider, lv_event_t event)
+{
+    if(event == LV_EVENT_VALUE_CHANGED) {
+        char buf[8];
+        lv_snprintf(buf, sizeof(buf), "%d%%", lv_slider_get_value(slider));
+        lv_label_set_text(slider_label, buf);
+        lv_obj_align(slider_label, slider, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);
+    }
+}
+
+#endif

examples/widgets/slider/lv_example_slider_1.py

@@ -0,0 +1,37 @@
+def event_handler(obj, event):
+    if event == lv.EVENT.VALUE_CHANGED:
+        print("Value: %d" % obj.get_value())
+
+# Create styles
+style_bg = lv.style_t()
+style_indic = lv.style_t()
+style_knob = lv.style_t()
+
+lv.style_copy(style_bg, lv.style_pretty)
+style_bg.body.main_color =  lv.color_make(0,0,0)
+style_bg.body.grad_color =  lv.color_make(0x80, 0x80, 0x80)
+style_bg.body.radius = 800 # large enough to make a circle
+style_bg.body.border.color = lv.color_make(0xff,0xff,0xff)
+
+lv.style_copy(style_indic, lv.style_pretty_color)
+style_indic.body.radius = 800
+style_indic.body.shadow.width = 8
+style_indic.body.shadow.color = style_indic.body.main_color
+style_indic.body.padding.left = 3
+style_indic.body.padding.right = 3
+style_indic.body.padding.top = 3
+style_indic.body.padding.bottom = 3
+
+lv.style_copy(style_knob, lv.style_pretty)
+style_knob.body.radius = 800
+style_knob.body.opa = lv.OPA._70
+style_knob.body.padding.top = 10
+style_knob.body.padding.bottom = 10
+
+# Create a slider
+slider = lv.slider(lv.scr_act())
+slider.set_style(lv.slider.STYLE.BG, style_bg)
+slider.set_style(lv.slider.STYLE.INDIC, style_indic)
+slider.set_style(lv.slider.STYLE.KNOB, style_knob)
+slider.align(None, lv.ALIGN.CENTER, 0, 0)
+slider.set_event_cb(event_handler)

examples/widgets/slider/lv_example_slider_2.c

@@ -0,0 +1,43 @@
+#include "../../../lvgl.h"
+#include <stdio.h>
+#if LV_USE_SLIDER
+
+static void slider_event_cb(lv_obj_t * slider, lv_event_t event);
+
+static lv_style_t style_pr;
+static lv_style_t style_def;
+
+/**
+ * Show the current value when the slider if pressed (using only styles).
+ *
+ */
+void lv_example_slider_2(void)
+{
+    lv_style_init(&style_def);
+    lv_style_set_content_opa(&style_def, LV_OPA_TRANSP);
+    lv_style_set_content_align(&style_def, LV_ALIGN_OUT_TOP_MID);
+
+    lv_style_init(&style_pr);
+    lv_style_set_content_opa(&style_pr, LV_OPA_COVER);
+    lv_style_set_content_ofs_y(&style_pr, -15);
+
+    /* 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_obj_add_style(slider, LV_PART_KNOB, LV_STATE_DEFAULT, &style_def);
+    lv_obj_add_style(slider, LV_PART_KNOB, LV_STATE_PRESSED, &style_pr);
+}
+
+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), "%u", lv_slider_get_value(slider));
+        lv_obj_set_style_content_text(slider, LV_PART_KNOB, LV_STATE_DEFAULT, buf);
+    }
+}
+
+#endif

examples/widgets/slider/lv_example_slider_2.py

@@ -0,0 +1,23 @@
+def slider_event_cb(slider, event):
+    if event == lv.EVENT.VALUE_CHANGED:
+        slider_label.set_text("%u" % slider.get_value())
+
+# Create a slider in the center of the display
+slider = lv.slider(lv.scr_act())
+slider.set_width(200)
+slider.align(None, lv.ALIGN.CENTER, 0, 0)
+slider.set_event_cb(slider_event_cb)
+slider.set_range(0, 100)
+
+# Create a label below the slider
+slider_label = lv.label(lv.scr_act())
+slider_label.set_text("0")
+slider_label.set_auto_realign(True)
+slider_label.align(slider, lv.ALIGN.OUT_BOTTOM_MID, 0, 10)
+
+# Create an informative label
+info = lv.label(lv.scr_act())
+info.set_text("""Welcome to the slider+label demo!
+Move the slider and see that the label
+updates to match it.""")
+info.align(None, lv.ALIGN.IN_TOP_LEFT, 10, 10)

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