init Files

libraries/lvgl/examples/widgets/dropdown/index.rst

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+
+Simple Drop down list
+---------------------
+
+.. lv_example:: widgets/dropdown/lv_example_dropdown_1
+  :language: c
+
+Drop down in four directions
+----------------------------
+
+.. lv_example:: widgets/dropdown/lv_example_dropdown_2
+  :language: c
+
+
+Menu
+----
+
+.. lv_example:: widgets/dropdown/lv_example_dropdown_3
+  :language: c
+

libraries/lvgl/examples/widgets/dropdown/lv_example_dropdown_1.c

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+#include "../../lv_examples.h"
+#if LV_USE_DROPDOWN && LV_BUILD_EXAMPLES
+
+static void event_handler(lv_event_t * e)
+{
+    lv_event_code_t code = lv_event_get_code(e);
+    lv_obj_t * obj = lv_event_get_target(e);
+    if(code == LV_EVENT_VALUE_CHANGED) {
+        char buf[32];
+        lv_dropdown_get_selected_str(obj, buf, sizeof(buf));
+        LV_LOG_USER("Option: %s", buf);
+    }
+}
+
+void lv_example_dropdown_1(void)
+{
+
+    /*Create a normal drop down list*/
+    lv_obj_t * dd = lv_dropdown_create(lv_screen_active());
+    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, LV_ALIGN_TOP_MID, 0, 20);
+    lv_obj_add_event_cb(dd, event_handler, LV_EVENT_ALL, NULL);
+}
+
+#endif

libraries/lvgl/examples/widgets/dropdown/lv_example_dropdown_2.c

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+#include "../../lv_examples.h"
+#if LV_USE_DROPDOWN && LV_BUILD_EXAMPLES
+
+/**
+ * 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";
+
+    lv_obj_t * dd;
+    dd = lv_dropdown_create(lv_screen_active());
+    lv_dropdown_set_options_static(dd, opts);
+    lv_obj_align(dd, LV_ALIGN_TOP_MID, 0, 10);
+
+    dd = lv_dropdown_create(lv_screen_active());
+    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, LV_ALIGN_BOTTOM_MID, 0, -10);
+
+    dd = lv_dropdown_create(lv_screen_active());
+    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, LV_ALIGN_LEFT_MID, 10, 0);
+
+    dd = lv_dropdown_create(lv_screen_active());
+    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, LV_ALIGN_RIGHT_MID, -10, 0);
+}
+
+#endif

libraries/lvgl/examples/widgets/dropdown/lv_example_dropdown_3.c

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+#include "../../lv_examples.h"
+#if LV_USE_DROPDOWN && LV_BUILD_EXAMPLES
+
+static void event_cb(lv_event_t * e)
+{
+    lv_obj_t * dropdown = lv_event_get_target(e);
+    char buf[64];
+    lv_dropdown_get_selected_str(dropdown, buf, sizeof(buf));
+    LV_LOG_USER("'%s' is selected", buf);
+}
+
+/**
+ * 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 * dropdown = lv_dropdown_create(lv_screen_active());
+    lv_obj_align(dropdown, LV_ALIGN_TOP_LEFT, 10, 10);
+    lv_dropdown_set_options(dropdown, "New project\n"
+                            "New file\n"
+                            "Save\n"
+                            "Save as ...\n"
+                            "Open project\n"
+                            "Recent projects\n"
+                            "Preferences\n"
+                            "Exit");
+
+    /*Set a fixed text to display on the button of the drop-down list*/
+    lv_dropdown_set_text(dropdown, "Menu");
+
+    /*Use a custom image as down icon and flip it when the list is opened*/
+    LV_IMAGE_DECLARE(img_caret_down);
+    lv_dropdown_set_symbol(dropdown, &img_caret_down);
+    lv_obj_set_style_transform_rotation(dropdown, 1800, LV_PART_INDICATOR | LV_STATE_CHECKED);
+
+    /*In a menu we don't need to show the last clicked item*/
+    lv_dropdown_set_selected_highlight(dropdown, false);
+
+    lv_obj_add_event_cb(dropdown, event_cb, LV_EVENT_VALUE_CHANGED, NULL);
+}
+
+#endif