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Alejandro Guerrero 2026-09-27 17:21:39 +02:00
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45
libraries/lvgl/examples/widgets/btn/lv_example_btn_3.c Normal file
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#include "../../lv_examples.h"
#if LV_BUILD_EXAMPLES && LV_USE_BTN
/**
* Create a style transition on a button to act like a gum when clicked
*/
void lv_example_btn_3(void)
{
/*Properties to transition*/
static lv_style_prop_t props[] = {
LV_STYLE_TRANSFORM_WIDTH, LV_STYLE_TRANSFORM_HEIGHT, LV_STYLE_TEXT_LETTER_SPACE, 0
};
/*Transition descriptor when going back to the default state.
*Add some delay to be sure the press transition is visible even if the press was very short*/
static lv_style_transition_dsc_t transition_dsc_def;
lv_style_transition_dsc_init(&transition_dsc_def, props, lv_anim_path_overshoot, 250, 100, NULL);
/*Transition descriptor when going to pressed state.
*No delay, go to presses state immediately*/
static lv_style_transition_dsc_t transition_dsc_pr;
lv_style_transition_dsc_init(&transition_dsc_pr, props, lv_anim_path_ease_in_out, 250, 0, NULL);
/*Add only the new transition to he default state*/
static lv_style_t style_def;
lv_style_init(&style_def);
lv_style_set_transition(&style_def, &transition_dsc_def);
/*Add the transition and some transformation to the presses state.*/
static lv_style_t style_pr;
lv_style_init(&style_pr);
lv_style_set_transform_width(&style_pr, 10);
lv_style_set_transform_height(&style_pr, -10);
lv_style_set_text_letter_space(&style_pr, 10);
lv_style_set_transition(&style_pr, &transition_dsc_pr);
lv_obj_t * btn1 = lv_btn_create(lv_scr_act());
lv_obj_align(btn1, LV_ALIGN_CENTER, 0, -80);
lv_obj_add_style(btn1, &style_pr, LV_STATE_PRESSED);
lv_obj_add_style(btn1, &style_def, 0);
lv_obj_t * label = lv_label_create(btn1);
lv_label_set_text(label, "Gum");
}
#endif