update asserts

examples/widgets/dropdown/lv_example_dropdown_1.c

@@ -0,0 +1,35 @@
+#include "../../../lvgl.h"
+#include <stdio.h>
+#if LV_USE_DROPDOWN
+
+
+static void event_handler(lv_obj_t * obj, lv_event_t event)
+{
+    if(event == LV_EVENT_VALUE_CHANGED) {
+        char buf[32];
+        lv_dropdown_get_selected_str(obj, buf, sizeof(buf));
+        printf("Option: %s\n", buf);
+    }
+}
+
+void lv_example_dropdown_1(void)
+{
+
+    /*Create a normal drop down list*/
+    lv_obj_t * dd = lv_dropdown_create(lv_scr_act(), NULL);
+    lv_dropdown_set_options(dd, "Apple\n"
+                                "Banana\n"
+                                "Orange\n"
+                                "Cherry\n"
+                                "Grape\n"
+                                "Raspberry\n"
+                                "Melon\n"
+                                "Orange\n"
+                                "Lemon\n"
+                                "Nuts");
+
+    lv_obj_align(dd, NULL, LV_ALIGN_IN_TOP_MID, 0, 20);
+    lv_obj_add_event_cb(dd, event_handler, NULL);
+}
+
+#endif

examples/widgets/dropdown/lv_example_dropdown_1.py

@@ -0,0 +1,21 @@
+def event_handler(obj, event):
+    if event == lv.EVENT.VALUE_CHANGED:
+        option = " "*10 # should be large enough to store the option
+        obj.get_selected_str(option, len(option))
+        # .strip() removes trailing spaces
+        print("Option: \"%s\"" % option.strip())
+
+# Create a drop down list
+ddlist = lv.ddlist(lv.scr_act())
+ddlist.set_options("\n".join([
+                    "Apple",
+                    "Banana",
+                    "Orange",
+                    "Melon",
+                    "Grape",
+                    "Raspberry"]))
+
+ddlist.set_fix_width(150)
+ddlist.set_draw_arrow(True)
+ddlist.align(None, lv.ALIGN.IN_TOP_MID, 0, 20)
+ddlist.set_event_cb(event_handler)

examples/widgets/dropdown/lv_example_dropdown_2.c

@@ -0,0 +1,42 @@
+#include "../../../lvgl.h"
+#include <stdio.h>
+#if LV_USE_DROPDOWN
+
+
+/**
+ * Create a drop down, up, left and right menus
+ */
+void lv_example_dropdown_2(void)
+{
+    static const char * opts = "Apple\n"
+                               "Banana\n"
+                               "Orange\n"
+                               "Melon\n"
+                               "Grape\n"
+                               "Raspberry";
+
+    lv_obj_t * dd;
+    dd = lv_dropdown_create(lv_scr_act(), NULL);
+    lv_dropdown_set_options_static(dd, opts);
+    lv_obj_align(dd, NULL, LV_ALIGN_IN_TOP_MID, 0, 10);
+
+    dd = lv_dropdown_create(lv_scr_act(), NULL);
+    lv_dropdown_set_options_static(dd, opts);
+    lv_dropdown_set_dir(dd, LV_DIR_BOTTOM);
+    lv_dropdown_set_symbol(dd, LV_SYMBOL_UP);
+    lv_obj_align(dd, NULL, LV_ALIGN_IN_BOTTOM_MID, 0, -10);
+
+    dd = lv_dropdown_create(lv_scr_act(), NULL);
+    lv_dropdown_set_options_static(dd, opts);
+    lv_dropdown_set_dir(dd, LV_DIR_RIGHT);
+    lv_dropdown_set_symbol(dd, LV_SYMBOL_RIGHT);
+    lv_obj_align(dd, NULL, LV_ALIGN_IN_LEFT_MID, 10, 0);
+
+    dd = lv_dropdown_create(lv_scr_act(), NULL);
+    lv_dropdown_set_options_static(dd, opts);
+    lv_dropdown_set_dir(dd, LV_DIR_LEFT);
+    lv_dropdown_set_symbol(dd, LV_SYMBOL_LEFT);
+    lv_obj_align(dd, NULL, LV_ALIGN_IN_RIGHT_MID, -10, 0);
+}
+
+#endif

examples/widgets/dropdown/lv_example_dropdown_2.py

@@ -0,0 +1,23 @@
+# Create a drop UP list by applying auto realign
+
+# Create a drop down list
+ddlist = lv.ddlist(lv.scr_act())
+ddlist.set_options("\n".join([
+                    "Apple",
+                    "Banana",
+                    "Orange",
+                    "Melon",
+                    "Grape",
+                    "Raspberry"]))
+
+
+ddlist.set_fix_width(150)
+ddlist.set_fix_height(150)
+ddlist.set_draw_arrow(True)
+
+# Enable auto-realign when the size changes.
+# It will keep the bottom of the ddlist fixed
+ddlist.set_auto_realign(True)
+
+# It will be called automatically when the size changes
+ddlist.align(None, lv.ALIGN.IN_BOTTOM_MID, 0, -20)

examples/widgets/dropdown/lv_example_dropdown_3.c

@@ -0,0 +1,34 @@
+#include "../../../lvgl.h"
+#include <stdio.h>
+#if LV_USE_DROPDOWN
+
+
+/**
+ * Create a menu from a drop-down list and show some drop-down list features and styling
+ */
+void lv_example_dropdown_3(void)
+{
+    /*Create a drop down list*/
+    lv_obj_t * dd = lv_dropdown_create(lv_scr_act(), NULL);
+    lv_obj_align(dd, NULL, LV_ALIGN_IN_TOP_RIGHT, -10, 10);
+    lv_dropdown_set_options(dd, "New\n"
+                                "Open\n"
+                                "Edit\n"
+                                "Close\n"
+                                "Preferences\n"
+                                "Exit");
+
+    /*Set a fixed text to display on the button of the drop-down list*/
+    lv_dropdown_set_text(dd, "Menu");
+
+    /*Use a custom image as down icon*/
+    LV_IMG_DECLARE(img_caret_down)
+    lv_dropdown_set_symbol(dd, &img_caret_down);
+
+    /* Remove the style of the selected part on the list.
+     * In a menu we don't need to show the last clicked item*/
+    lv_obj_t * list = lv_dropdown_get_list(dd);
+    lv_obj_remove_style(list, LV_PART_SELECTED, LV_STATE_DEFAULT, NULL);
+}
+
+#endif