update asserts

examples/widgets/btn/lv_example_btn_1.c

@@ -0,0 +1,35 @@
+#include "../../../lvgl.h"
+#include <stdio.h>
+#if LV_USE_BTN
+
+static void event_handler(lv_obj_t * obj, lv_event_t event)
+{
+    if(event == LV_EVENT_CLICKED) {
+        printf("Clicked\n");
+    }
+    else if(event == LV_EVENT_VALUE_CHANGED) {
+        printf("Toggled\n");
+    }
+}
+
+void lv_example_btn_1(void)
+{
+    lv_obj_t * label;
+
+    lv_obj_t * btn1 = lv_btn_create(lv_scr_act(), NULL);
+    lv_obj_add_event_cb(btn1, event_handler, NULL);
+    lv_obj_align(btn1, NULL, LV_ALIGN_CENTER, 0, -40);
+
+    label = lv_label_create(btn1, NULL);
+    lv_label_set_text(label, "Button");
+
+    lv_obj_t * btn2 = lv_btn_create(lv_scr_act(), NULL);
+    lv_obj_add_event_cb(btn2, event_handler, NULL);
+    lv_obj_align(btn2, NULL, LV_ALIGN_CENTER, 0, 40);
+    lv_obj_add_flag(btn2, LV_OBJ_FLAG_CHECKABLE);
+    lv_obj_set_height(btn2, LV_SIZE_CONTENT);
+
+    label = lv_label_create(btn2, NULL);
+    lv_label_set_text(label, "Toggle");
+}
+#endif

examples/widgets/btn/lv_example_btn_1.py

@@ -0,0 +1,21 @@
+def event_handler(obj, event):
+    if event == lv.EVENT.CLICKED:
+        print("Clicked")
+
+btn1 = lv.btn(lv.scr_act())
+btn1.set_event_cb(event_handler)
+btn1.align(None, lv.ALIGN.CENTER, 0, -40)
+
+label = lv.label(btn1)
+label.set_text("Button")
+
+btn2 = lv.btn(lv.scr_act())
+# callback can be lambda:
+btn2.set_event_cb(lambda obj, event: print("Toggled") if event == lv.EVENT.VALUE_CHANGED else None)
+btn2.align(None, lv.ALIGN.CENTER, 0, 40)
+btn2.set_toggle(True)
+btn2.toggle()
+btn2.set_fit2(lv.FIT.NONE, lv.FIT.TIGHT)
+
+label = lv.label(btn2)
+label.set_text("Toggled")

examples/widgets/btn/lv_example_btn_2.c

@@ -0,0 +1,52 @@
+#include "../../../lvgl.h"
+#include <stdio.h>
+#if LV_USE_BTN
+
+/**
+ * Style a button from scratch
+ */
+void lv_example_btn_2(void)
+{
+
+    static lv_style_t style;
+    static lv_style_t style_pr;
+    lv_style_init(&style);
+    lv_style_init(&style_pr);
+
+    /*Init the default style*/
+    lv_style_set_radius(&style, 3);
+
+    lv_style_set_bg_opa(&style, LV_OPA_70);
+    lv_style_set_bg_color(&style, LV_COLOR_BLUE);
+    lv_style_set_bg_grad_color(&style, LV_COLOR_AQUA);
+    lv_style_set_bg_grad_dir(&style, LV_GRAD_DIR_VER);
+
+    lv_style_set_border_opa(&style, LV_OPA_40);
+    lv_style_set_border_width(&style, 2);
+    lv_style_set_border_color(&style, LV_COLOR_GRAY);
+
+    lv_style_set_shadow_width(&style, 8);
+    lv_style_set_shadow_color(&style, LV_COLOR_GRAY);
+    lv_style_set_shadow_ofs_x(&style, 8);
+    lv_style_set_shadow_ofs_y(&style, 8);
+
+    lv_style_set_text_color(&style, LV_COLOR_WHITE);
+
+    /*Init the pressed style*/
+    lv_style_set_shadow_ofs_x(&style_pr, 4);
+    lv_style_set_shadow_ofs_y(&style_pr, 4);
+    lv_style_set_color_filter_cb(&style_pr, lv_color_darken);   /*Darken every color*/
+    lv_style_set_color_filter_opa(&style_pr, LV_OPA_30);
+
+    lv_obj_t * btn1 = lv_btn_create(lv_scr_act(), NULL);
+    lv_obj_remove_style(btn1, LV_PART_ANY, LV_STATE_ANY, NULL);
+    lv_obj_add_style(btn1, LV_PART_MAIN, LV_STATE_DEFAULT, &style);
+    lv_obj_add_style(btn1, LV_PART_MAIN, LV_STATE_PRESSED, &style_pr);
+    lv_obj_align(btn1, NULL, LV_ALIGN_CENTER, 0, 0);
+
+    lv_obj_t * label = lv_label_create(btn1, NULL);
+    lv_label_set_text(label, "Button");
+    lv_obj_align(label, NULL, LV_ALIGN_CENTER, 0, 0);
+
+}
+#endif