init lvgl code

LVGL.Simulator/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
+
+

LVGL.Simulator/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*/

LVGL.Simulator/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_btn_create(lv_scr_act());
+    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

LVGL.Simulator/lvgl/examples/event/lv_example_event_1.py

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+class Event_1():
+    def __init__(self):
+        self.cnt = 1
+        #
+        # Add click event to a button
+        #
+
+        btn = lv.btn(lv.scr_act())
+        btn.set_size(100, 50)
+        btn.center()
+        btn.add_event_cb(self.event_cb, lv.EVENT.CLICKED, None)
+
+        label = lv.label(btn)
+        label.set_text("Click me!")
+        label.center()
+
+    def event_cb(self,e):
+        print("Clicked")
+
+        btn = e.get_target()
+        label = btn.get_child(0)
+        label.set_text(str(self.cnt))
+        self.cnt += 1
+
+evt1 = Event_1()

LVGL.Simulator/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_btn_create(lv_scr_act());
+    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_scr_act());
+    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

LVGL.Simulator/lvgl/examples/event/lv_example_event_2.py

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+def event_cb(e,label):
+    code = e.get_code()
+    if code == lv.EVENT.PRESSED:
+        label.set_text("The last button event:\nLV_EVENT_PRESSED")
+    elif code == lv.EVENT.CLICKED:
+        label.set_text("The last button event:\nLV_EVENT_CLICKED")
+    elif code == lv.EVENT.LONG_PRESSED:
+        label.set_text("The last button event:\nLV_EVENT_LONG_PRESSED")
+    elif code == lv.EVENT.LONG_PRESSED_REPEAT:
+        label.set_text("The last button event:\nLV_EVENT_LONG_PRESSED_REPEAT")
+btn = lv.btn(lv.scr_act())
+btn.set_size(100, 50)
+btn.center()
+
+btn_label = lv.label(btn)
+btn_label.set_text("Click me!")
+btn_label.center()
+
+info_label = lv.label(lv.scr_act())
+info_label.set_text("The last button event:\nNone")
+
+btn.add_event_cb(lambda e: event_cb(e,info_label), lv.EVENT.ALL, None)

LVGL.Simulator/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_scr_act());
+    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_btn_create(cont);
+        lv_obj_set_size(btn, 80, 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

LVGL.Simulator/lvgl/examples/event/lv_example_event_3.py

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+def event_cb(e):
+
+    # The original target of the event. Can be the buttons or the container
+    target = e.get_target()
+    # print(type(target))
+
+    # If container was clicked do nothing
+    if type(target) != type(lv.btn()):
+        return
+
+    # Make the clicked buttons red
+    target.set_style_bg_color(lv.palette_main(lv.PALETTE.RED), 0)
+
+#
+# Demonstrate event bubbling
+#
+
+cont = lv.obj(lv.scr_act())
+cont.set_size(320, 200)
+cont.center()
+cont.set_flex_flow(lv.FLEX_FLOW.ROW_WRAP)
+
+for i in range(30):
+    btn = lv.btn(cont)
+    btn.set_size(80, 50)
+    btn.add_flag(lv.obj.FLAG.EVENT_BUBBLE)
+
+    label = lv.label(btn)
+    label.set_text(str(i))
+    label.center()
+
+cont.add_event_cb(event_cb, lv.EVENT.CLICKED, None)

LVGL.Simulator/lvgl/examples/event/lv_example_event_4.c

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+#include "../lv_examples.h"
+
+#if LV_BUILD_EXAMPLES
+
+static int n = 3;
+static lv_obj_t * label = NULL;
+
+static void timer_cb(lv_timer_t * timer)
+{
+    if(n < 3 || n > 32) {
+        n = 3;
+    }
+    else {
+        static uint32_t old_tick = 0;
+        uint32_t tick = lv_tick_get();
+        if(!old_tick) {
+            old_tick = tick;
+        }
+        if(tick - old_tick > 3000) {
+            n++;
+            lv_label_set_text_fmt(label, "%d sides", n);
+            old_tick = tick;
+        }
+    }
+    lv_obj_invalidate(timer->user_data);
+}
+
+static void event_cb(lv_event_t * e)
+{
+    /*The original target of the event. Can be the buttons or the container*/
+    lv_draw_ctx_t * draw_ctx = lv_event_get_draw_ctx(e);
+    lv_draw_rect_dsc_t draw_dsc;
+    lv_draw_rect_dsc_init(&draw_dsc);
+    draw_dsc.bg_color = lv_palette_main(LV_PALETTE_LIGHT_GREEN);
+    draw_dsc.bg_opa = LV_OPA_COVER;
+    lv_point_t points[32];
+    int i, r = 150;
+    uint32_t tick = lv_tick_get();
+    for(i = 0; i < n; i++) {
+        int angle = i * 360 / n + ((tick % 36000) / 100);
+        lv_coord_t x = 150 + (r * lv_trigo_cos(angle) >> LV_TRIGO_SHIFT), y =
+                           150 + (r * lv_trigo_sin(angle) >> LV_TRIGO_SHIFT);
+        points[i].x = x;
+        points[i].y = y;
+    }
+    lv_draw_polygon(draw_ctx, &draw_dsc, points, n);
+}
+
+/**
+ * Demonstrate event bubbling
+ */
+void lv_example_event_4(void)
+{
+
+    lv_obj_t * cont = lv_obj_create(lv_scr_act());
+    lv_obj_remove_style_all(cont);
+    lv_obj_set_size(cont, 300, 300);
+    label = lv_label_create(cont);
+    lv_label_set_text_fmt(label, "%d sides", n);
+    lv_obj_center(label);
+
+    lv_obj_add_event_cb(cont, event_cb, LV_EVENT_DRAW_MAIN, NULL);
+    lv_timer_create(timer_cb, 17, cont);
+}
+
+#endif