mirror of
https://github.com/lvgl/lvgl.git
synced 2026-05-10 04:37:55 +08:00
Mutahhar Mustafa Khan
54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
#include "../lv_examples.h"
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#if LV_BUILD_EXAMPLES && LV_USE_SWITCH
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static void event_cb(lv_event_t * e)
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{
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lv_event_code_t code = lv_event_get_code(e);
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lv_obj_t * label = (lv_obj_t *) lv_event_get_user_data(e);
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switch(code) {
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case LV_EVENT_PRESSED:
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lv_label_set_text(label, "The last button event:\nLV_EVENT_PRESSED");
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break;
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case LV_EVENT_CLICKED:
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lv_label_set_text(label, "The last button event:\nLV_EVENT_CLICKED");
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break;
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case LV_EVENT_LONG_PRESSED:
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lv_label_set_text(label, "The last button event:\nLV_EVENT_LONG_PRESSED");
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break;
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case LV_EVENT_LONG_PRESSED_REPEAT:
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lv_label_set_text(label, "The last button event:\nLV_EVENT_LONG_PRESSED_REPEAT");
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break;
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default:
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break;
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}
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}
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/**
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* @title Handle multiple button events
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* @brief Report the most recent button event on a second label.
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*
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* A centered button with a `Click me!` label is paired with an info label
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* on the active screen. A single callback subscribed with `LV_EVENT_ALL`
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* switches on `lv_event_get_code` and writes the name of the latest event
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* (`LV_EVENT_PRESSED`, `LV_EVENT_CLICKED`, `LV_EVENT_LONG_PRESSED`,
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* `LV_EVENT_LONG_PRESSED_REPEAT`) into the info label.
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*/
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void lv_example_event_button(void)
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{
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lv_obj_t * btn = lv_button_create(lv_screen_active());
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lv_obj_set_size(btn, 100, 50);
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lv_obj_center(btn);
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lv_obj_t * btn_label = lv_label_create(btn);
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lv_label_set_text(btn_label, "Click me!");
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lv_obj_center(btn_label);
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lv_obj_t * info_label = lv_label_create(lv_screen_active());
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lv_label_set_text(info_label, "The last button event:\nNone");
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lv_obj_add_event_cb(btn, event_cb, LV_EVENT_ALL, info_label);
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}
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#endif
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