Wie kann ich ein Etikett vertikal zentrieren?

Question

Ich entwickle eine native App für Samsung Gear (Tizen). Ich habe eine mehrzeilige Bezeichnung dynamisch generiert (kann 2 oder 3 Zeilen haben). Wie kann ich es vertikal zentrieren?

Answer 1

Verwenden Sie den Elementary Box Container. Ausrichtung von Kindern in vertikaler Mitte.

Hier ist Beispielcode. Verweisen Sie den Code für die Box und 3 Etiketten in der Funktion app_create.

#include <sstream> 

#include <app.h> 
#include <Elementary.h> 
#include <efl_extension.h> 

static bool app_create(void *data) 
{ 
    Evas_Object *win = elm_win_util_standard_add("sample", "sample"); 
    elm_win_autodel_set(win, EINA_TRUE); 

    if (elm_win_wm_rotation_supported_get(win)) { 
     int rots[4] = { 0, 90, 180, 270 }; 
     elm_win_wm_rotation_available_rotations_set(win, (const int *)(&rots), 4); 
    } 

    auto back_cb = [](void *data, Evas_Object *obj, void *event_info) { 
     elm_win_lower(static_cast<Evas_Object*>(data)); 
    }; 

    evas_object_smart_callback_add(win, "delete,request", 
      [](void*, Evas_Object*, void*){ui_app_exit();}, NULL); 
    eext_object_event_callback_add(win, EEXT_CALLBACK_BACK, back_cb, win); 

    Evas_Object *conform = elm_conformant_add(win); 
    elm_win_indicator_mode_set(win, ELM_WIN_INDICATOR_SHOW); 
    elm_win_indicator_opacity_set(win, ELM_WIN_INDICATOR_OPAQUE); 
    evas_object_size_hint_weight_set(conform, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND); 
    elm_win_resize_object_add(win, conform); 
    evas_object_show(conform); 

    Evas_Object *box = elm_box_add(conform); 
    evas_object_show(box); 
    elm_object_content_set(conform, box); 

    Evas_Object *labels[3]; 

    for (int i=0; i<3; i++) 
    { 
     std::ostringstream ss; 
     ss << "<align=center>line : " << i << "</align>"; 
     labels[i] = elm_label_add(box); 
     elm_object_text_set(labels[i], ss.str().c_str()); 
     evas_object_show(labels[i]); 
     elm_box_pack_end(box, labels[i]); 
    } 

    evas_object_show(win); 
    return true; 
} 


int main(int argc, char *argv[]) 
{ 
    ui_app_lifecycle_callback_s event_callback = { 
      app_create, nullptr, nullptr, nullptr, nullptr 
    }; 
    return ui_app_main(argc, argv, &event_callback, nullptr); 
}