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