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lvgl_v8_back/lvgl/examples/widgets/checkbox/index.rst

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+
+Simple Checkboxes
+"""""""""""""""""
+
+.. lv_example:: widgets/checkbox/lv_example_checkbox_1
+  :language: c
+
+Checkboxes as radio buttons
+"""""""""""""""""""""""""""
+.. lv_example:: widgets/checkbox/lv_example_checkbox_2
+  :language: c
+

lvgl_v8_back/lvgl/examples/widgets/checkbox/lv_example_checkbox_1.c

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+#include "../../lv_examples.h"
+#if LV_USE_CHECKBOX && 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) {
+        const char * txt = lv_checkbox_get_text(obj);
+        const char * state = lv_obj_get_state(obj) & LV_STATE_CHECKED ? "Checked" : "Unchecked";
+        LV_LOG_USER("%s: %s", txt, state);
+    }
+}
+
+void lv_example_checkbox_1(void)
+{
+    lv_obj_set_flex_flow(lv_scr_act(), LV_FLEX_FLOW_COLUMN);
+    lv_obj_set_flex_align(lv_scr_act(), LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_CENTER);
+
+    lv_obj_t * cb;
+    cb = lv_checkbox_create(lv_scr_act());
+    lv_checkbox_set_text(cb, "Apple");
+    lv_obj_add_event_cb(cb, event_handler, LV_EVENT_ALL, NULL);
+
+    cb = lv_checkbox_create(lv_scr_act());
+    lv_checkbox_set_text(cb, "Banana");
+    lv_obj_add_state(cb, LV_STATE_CHECKED);
+    lv_obj_add_event_cb(cb, event_handler, LV_EVENT_ALL, NULL);
+
+    cb = lv_checkbox_create(lv_scr_act());
+    lv_checkbox_set_text(cb, "Lemon");
+    lv_obj_add_state(cb, LV_STATE_DISABLED);
+    lv_obj_add_event_cb(cb, event_handler, LV_EVENT_ALL, NULL);
+
+    cb = lv_checkbox_create(lv_scr_act());
+    lv_obj_add_state(cb, LV_STATE_CHECKED | LV_STATE_DISABLED);
+    lv_checkbox_set_text(cb, "Melon\nand a new line");
+    lv_obj_add_event_cb(cb, event_handler, LV_EVENT_ALL, NULL);
+
+    lv_obj_update_layout(cb);
+}
+
+#endif

lvgl_v8_back/lvgl/examples/widgets/checkbox/lv_example_checkbox_1.py

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+def event_handler(e):
+    code = e.get_code()
+    obj = e.get_target()
+    if code == lv.EVENT.VALUE_CHANGED:
+        txt = obj.get_text()
+        if obj.get_state() & lv.STATE.CHECKED:
+            state = "Checked"
+        else:
+            state = "Unchecked"
+        print(txt + ":" + state)
+
+
+lv.scr_act().set_flex_flow(lv.FLEX_FLOW.COLUMN)
+lv.scr_act().set_flex_align(lv.FLEX_ALIGN.CENTER, lv.FLEX_ALIGN.START, lv.FLEX_ALIGN.CENTER)
+
+cb = lv.checkbox(lv.scr_act())
+cb.set_text("Apple")
+cb.add_event_cb(event_handler, lv.EVENT.ALL, None)
+
+cb = lv.checkbox(lv.scr_act())
+cb.set_text("Banana")
+cb.add_state(lv.STATE.CHECKED)
+cb.add_event_cb(event_handler, lv.EVENT.ALL, None)
+
+cb = lv.checkbox(lv.scr_act())
+cb.set_text("Lemon")
+cb.add_state(lv.STATE.DISABLED)
+cb.add_event_cb(event_handler, lv.EVENT.ALL, None)
+
+cb = lv.checkbox(lv.scr_act())
+cb.add_state(lv.STATE.CHECKED | lv.STATE.DISABLED)
+cb.set_text("Melon")
+cb.add_event_cb(event_handler, lv.EVENT.ALL, None)
+
+cb.update_layout()
+

lvgl_v8_back/lvgl/examples/widgets/checkbox/lv_example_checkbox_2.c

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+#include "../../lv_examples.h"
+#if LV_USE_CHECKBOX && LV_BUILD_EXAMPLES
+
+static lv_style_t style_radio;
+static lv_style_t style_radio_chk;
+static uint32_t active_index_1 = 0;
+static uint32_t active_index_2 = 0;
+
+static void radio_event_handler(lv_event_t * e)
+{
+    uint32_t * active_id = lv_event_get_user_data(e);
+    lv_obj_t * cont = lv_event_get_current_target(e);
+    lv_obj_t * act_cb = lv_event_get_target(e);
+    lv_obj_t * old_cb = lv_obj_get_child(cont, *active_id);
+
+    /*Do nothing if the container was clicked*/
+    if(act_cb == cont) return;
+
+    lv_obj_clear_state(old_cb, LV_STATE_CHECKED);   /*Uncheck the previous radio button*/
+    lv_obj_add_state(act_cb, LV_STATE_CHECKED);     /*Uncheck the current radio button*/
+
+    *active_id = lv_obj_get_index(act_cb);
+
+    LV_LOG_USER("Selected radio buttons: %d, %d", (int)active_index_1, (int)active_index_2);
+}
+
+
+static void radiobutton_create(lv_obj_t * parent, const char * txt)
+{
+    lv_obj_t * obj = lv_checkbox_create(parent);
+    lv_checkbox_set_text(obj, txt);
+    lv_obj_add_flag(obj, LV_OBJ_FLAG_EVENT_BUBBLE);
+    lv_obj_add_style(obj, &style_radio, LV_PART_INDICATOR);
+    lv_obj_add_style(obj, &style_radio_chk, LV_PART_INDICATOR | LV_STATE_CHECKED);
+}
+
+/**
+ * Checkboxes as radio buttons
+ */
+void lv_example_checkbox_2(void)
+{
+    /* The idea is to enable `LV_OBJ_FLAG_EVENT_BUBBLE` on checkboxes and process the
+     * `LV_EVENT_CLICKED` on the container.
+     * A variable is passed as event user data where the index of the active
+     * radiobutton is saved */
+
+
+    lv_style_init(&style_radio);
+    lv_style_set_radius(&style_radio, LV_RADIUS_CIRCLE);
+
+    lv_style_init(&style_radio_chk);
+    lv_style_set_bg_img_src(&style_radio_chk, NULL);
+
+    uint32_t i;
+    char buf[32];
+
+    lv_obj_t * cont1 = lv_obj_create(lv_scr_act());
+    lv_obj_set_flex_flow(cont1, LV_FLEX_FLOW_COLUMN);
+    lv_obj_set_size(cont1, lv_pct(40), lv_pct(80));
+    lv_obj_add_event_cb(cont1, radio_event_handler, LV_EVENT_CLICKED, &active_index_1);
+
+    for(i = 0; i < 5; i++) {
+        lv_snprintf(buf, sizeof(buf), "A %d", (int)i + 1);
+        radiobutton_create(cont1, buf);
+
+    }
+    /*Make the first checkbox checked*/
+    lv_obj_add_state(lv_obj_get_child(cont1, 0), LV_STATE_CHECKED);
+
+    lv_obj_t * cont2 = lv_obj_create(lv_scr_act());
+    lv_obj_set_flex_flow(cont2, LV_FLEX_FLOW_COLUMN);
+    lv_obj_set_size(cont2, lv_pct(40), lv_pct(80));
+    lv_obj_set_x(cont2, lv_pct(50));
+    lv_obj_add_event_cb(cont2, radio_event_handler, LV_EVENT_CLICKED, &active_index_2);
+
+    for(i = 0; i < 3; i++) {
+        lv_snprintf(buf, sizeof(buf), "B %d", (int)i + 1);
+        radiobutton_create(cont2, buf);
+    }
+
+    /*Make the first checkbox checked*/
+    lv_obj_add_state(lv_obj_get_child(cont2, 0), LV_STATE_CHECKED);
+}
+
+
+#endif