init Files

libraries/lvgl/examples/event/index.rst

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+
+Button click event
+------------------
+
+.. lv_example:: event/lv_example_event_1
+  :language: c
+
+Handle multiple events
+----------------------
+.. lv_example:: event/lv_example_event_2
+  :language: c
+
+
+Event bubbling
+--------------
+.. lv_example:: event/lv_example_event_3
+  :language: c
+
+Draw event
+----------
+.. lv_example:: event/lv_example_event_4
+  :language: c
+
+

libraries/lvgl/examples/event/lv_example_event.h

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+/**
+ * @file lv_example_event.h
+ *
+ */
+
+#ifndef LV_EXAMPLE_EVENT_H
+#define LV_EXAMPLE_EVENT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void lv_example_event_1(void);
+void lv_example_event_2(void);
+void lv_example_event_3(void);
+void lv_example_event_4(void);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif /*LV_EXAMPLE_EVENT_H*/

libraries/lvgl/examples/event/lv_example_event_1.c

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+#include "../lv_examples.h"
+#if LV_BUILD_EXAMPLES && LV_USE_SWITCH
+
+static void event_cb(lv_event_t * e)
+{
+    LV_LOG_USER("Clicked");
+
+    static uint32_t cnt = 1;
+    lv_obj_t * btn = lv_event_get_target(e);
+    lv_obj_t * label = lv_obj_get_child(btn, 0);
+    lv_label_set_text_fmt(label, "%"LV_PRIu32, cnt);
+    cnt++;
+}
+
+/**
+ * Add click event to a button
+ */
+void lv_example_event_1(void)
+{
+    lv_obj_t * btn = lv_button_create(lv_screen_active());
+    lv_obj_set_size(btn, 100, 50);
+    lv_obj_center(btn);
+    lv_obj_add_event_cb(btn, event_cb, LV_EVENT_CLICKED, NULL);
+
+    lv_obj_t * label = lv_label_create(btn);
+    lv_label_set_text(label, "Click me!");
+    lv_obj_center(label);
+}
+
+#endif

libraries/lvgl/examples/event/lv_example_event_2.c

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+#include "../lv_examples.h"
+#if LV_BUILD_EXAMPLES && LV_USE_SWITCH
+
+static void event_cb(lv_event_t * e)
+{
+    lv_event_code_t code = lv_event_get_code(e);
+    lv_obj_t * label = lv_event_get_user_data(e);
+
+    switch(code) {
+        case LV_EVENT_PRESSED:
+            lv_label_set_text(label, "The last button event:\nLV_EVENT_PRESSED");
+            break;
+        case LV_EVENT_CLICKED:
+            lv_label_set_text(label, "The last button event:\nLV_EVENT_CLICKED");
+            break;
+        case LV_EVENT_LONG_PRESSED:
+            lv_label_set_text(label, "The last button event:\nLV_EVENT_LONG_PRESSED");
+            break;
+        case LV_EVENT_LONG_PRESSED_REPEAT:
+            lv_label_set_text(label, "The last button event:\nLV_EVENT_LONG_PRESSED_REPEAT");
+            break;
+        default:
+            break;
+    }
+}
+
+/**
+ * Handle multiple events
+ */
+void lv_example_event_2(void)
+{
+    lv_obj_t * btn = lv_button_create(lv_screen_active());
+    lv_obj_set_size(btn, 100, 50);
+    lv_obj_center(btn);
+
+    lv_obj_t * btn_label = lv_label_create(btn);
+    lv_label_set_text(btn_label, "Click me!");
+    lv_obj_center(btn_label);
+
+    lv_obj_t * info_label = lv_label_create(lv_screen_active());
+    lv_label_set_text(info_label, "The last button event:\nNone");
+
+    lv_obj_add_event_cb(btn, event_cb, LV_EVENT_ALL, info_label);
+}
+
+#endif

libraries/lvgl/examples/event/lv_example_event_3.c

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+#include "../lv_examples.h"
+#if LV_BUILD_EXAMPLES && LV_USE_FLEX
+
+static void event_cb(lv_event_t * e)
+{
+    /*The original target of the event. Can be the buttons or the container*/
+    lv_obj_t * target = lv_event_get_target(e);
+
+    /*The current target is always the container as the event is added to it*/
+    lv_obj_t * cont = lv_event_get_current_target(e);
+
+    /*If container was clicked do nothing*/
+    if(target == cont) return;
+
+    /*Make the clicked buttons red*/
+    lv_obj_set_style_bg_color(target, lv_palette_main(LV_PALETTE_RED), 0);
+}
+
+/**
+ * Demonstrate event bubbling
+ */
+void lv_example_event_3(void)
+{
+
+    lv_obj_t * cont = lv_obj_create(lv_screen_active());
+    lv_obj_set_size(cont, 290, 200);
+    lv_obj_center(cont);
+    lv_obj_set_flex_flow(cont, LV_FLEX_FLOW_ROW_WRAP);
+
+    uint32_t i;
+    for(i = 0; i < 30; i++) {
+        lv_obj_t * btn = lv_button_create(cont);
+        lv_obj_set_size(btn, 70, 50);
+        lv_obj_add_flag(btn, LV_OBJ_FLAG_EVENT_BUBBLE);
+
+        lv_obj_t * label = lv_label_create(btn);
+        lv_label_set_text_fmt(label, "%"LV_PRIu32, i);
+        lv_obj_center(label);
+    }
+
+    lv_obj_add_event_cb(cont, event_cb, LV_EVENT_CLICKED, NULL);
+}
+
+#endif

libraries/lvgl/examples/event/lv_example_event_4.c

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+#include "../lv_examples.h"
+
+#if LV_BUILD_EXAMPLES
+
+static uint32_t size = 0;
+static bool size_dec = false;
+
+static void timer_cb(lv_timer_t * timer)
+{
+    lv_obj_invalidate(lv_timer_get_user_data(timer));
+    if(size_dec) size--;
+    else size++;
+
+    if(size == 50) size_dec = true;
+    else if(size == 0) size_dec = false;
+}
+
+static void event_cb(lv_event_t * e)
+{
+    lv_obj_t * obj = lv_event_get_target(e);
+    lv_draw_task_t * draw_task = lv_event_get_draw_task(e);
+    lv_draw_dsc_base_t * base_dsc = lv_draw_task_get_draw_dsc(draw_task);
+    if(base_dsc->part == LV_PART_MAIN) {
+        lv_draw_rect_dsc_t draw_dsc;
+        lv_draw_rect_dsc_init(&draw_dsc);
+        draw_dsc.bg_color = lv_color_hex(0xffaaaa);
+        draw_dsc.radius = LV_RADIUS_CIRCLE;
+        draw_dsc.border_color = lv_color_hex(0xff5555);
+        draw_dsc.border_width = 2;
+        draw_dsc.outline_color = lv_color_hex(0xff0000);
+        draw_dsc.outline_pad = 3;
+        draw_dsc.outline_width = 2;
+
+        lv_area_t a;
+        a.x1 = 0;
+        a.y1 = 0;
+        a.x2 = size;
+        a.y2 = size;
+        lv_area_t obj_coords;
+        lv_obj_get_coords(obj, &obj_coords);
+        lv_area_align(&obj_coords, &a, LV_ALIGN_CENTER, 0, 0);
+
+        lv_draw_rect(base_dsc->layer, &draw_dsc, &a);
+    }
+}
+
+/**
+ * Demonstrate the usage of draw event
+ */
+void lv_example_event_4(void)
+{
+    lv_obj_t * cont = lv_obj_create(lv_screen_active());
+    lv_obj_set_size(cont, 200, 200);
+    lv_obj_center(cont);
+    lv_obj_add_event_cb(cont, event_cb, LV_EVENT_DRAW_TASK_ADDED, NULL);
+    lv_obj_add_flag(cont, LV_OBJ_FLAG_SEND_DRAW_TASK_EVENTS);
+    lv_timer_create(timer_cb, 30, cont);
+}
+
+#endif