efl

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//Compile with:
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//gcc -g box_example_02.c -o box_example_02 `pkg-config --cflags --libs elementary`
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#include <Elementary.h>
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typedef struct
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{
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   Eina_List *transitions;
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   Evas_Object *box;
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   Evas_Object_Box_Layout last_layout;
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} Transitions_Data;
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static void
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_add_cb(void *data, Evas_Object *obj EINA_UNUSED, void *ev EINA_UNUSED)
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{
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   Evas_Object *btn;
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   Eina_List *children;
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   Transitions_Data *tdata = data;
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   btn = elm_button_add(tdata->box);
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   elm_object_text_set(btn, "I do nothing");
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   children = (Eina_List *)elm_box_children_get(tdata->box);
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   if (children)
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     {
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        elm_box_pack_after(tdata->box, btn, (Evas_Object *)children->data);
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        eina_list_free(children);
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     }
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   else
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     elm_box_pack_end(tdata->box, btn);
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   evas_object_show(btn);
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}
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static void
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_clear_cb(void *data, Evas_Object *obj EINA_UNUSED, void *ev EINA_UNUSED)
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{
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   Transitions_Data *tdata = data;
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   elm_box_clear(tdata->box);
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}
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static void
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_unpack_cb(void *data, Evas_Object *obj, void *ev EINA_UNUSED)
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{
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   Transitions_Data *tdata = data;
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   elm_box_unpack(tdata->box, obj);
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   evas_object_move(obj, 0, 50);
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   evas_object_color_set(obj, 128, 64, 0, 128);
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}
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static void
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_test_box_transition_change(void *data)
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{
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   Transitions_Data *tdata = data;
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   Elm_Box_Transition *layout_data;
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   Evas_Object_Box_Layout next_layout;
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   if (!data) return;
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   next_layout = eina_list_data_get(tdata->transitions);
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   layout_data = elm_box_transition_new(2.0, tdata->last_layout,
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                                        NULL, NULL, next_layout, NULL, NULL,
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                                        _test_box_transition_change, tdata);
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   elm_box_layout_set(tdata->box, elm_box_layout_transition, layout_data,
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                      elm_box_transition_free);
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   tdata->last_layout = next_layout;
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   tdata->transitions = eina_list_demote_list(tdata->transitions,
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                                              tdata->transitions);
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}
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EAPI_MAIN int
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elm_main(int argc EINA_UNUSED, char **argv EINA_UNUSED)
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{
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   Evas_Object *win, *bigbox, *bx, *bt;
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   static Transitions_Data tdata = {
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        .transitions = NULL,
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        .box = NULL,
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        .last_layout = NULL
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   };
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   elm_policy_set(ELM_POLICY_QUIT, ELM_POLICY_QUIT_LAST_WINDOW_CLOSED);
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   win = elm_win_util_standard_add("box-transition", "Box Transition");
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   elm_win_autodel_set(win, EINA_TRUE);
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   bigbox = elm_box_add(win);
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   evas_object_size_hint_weight_set(bigbox, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
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   elm_win_resize_object_add(win, bigbox);
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   evas_object_show(bigbox);
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   bx = elm_box_add(win);
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   elm_box_horizontal_set(bx, EINA_TRUE);
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   elm_box_pack_end(bigbox, bx);
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   evas_object_show(bx);
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   bt = elm_button_add(win);
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   elm_object_text_set(bt, "Add");
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   elm_box_pack_end(bx, bt);
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   evas_object_show(bt);
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   evas_object_smart_callback_add(bt, "clicked", _add_cb, &tdata);
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   bt = elm_button_add(win);
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   elm_object_text_set(bt, "Clear");
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   elm_box_pack_end(bx, bt);
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   evas_object_show(bt);
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   evas_object_smart_callback_add(bt, "clicked", _clear_cb, &tdata);
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   bx = elm_box_add(win);
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   evas_object_size_hint_weight_set(bx, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
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   evas_object_size_hint_align_set(bx, EVAS_HINT_FILL, EVAS_HINT_FILL);
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   elm_box_pack_end(bigbox, bx);
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   evas_object_show(bx);
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   bt = elm_button_add(win);
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   elm_object_text_set(bt, "Button 1");
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   evas_object_smart_callback_add(bt, "clicked", _unpack_cb, &tdata);
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   evas_object_size_hint_weight_set(bt, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
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   evas_object_size_hint_align_set(bt, EVAS_HINT_FILL, EVAS_HINT_FILL);
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   elm_box_pack_end(bx, bt);
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   evas_object_show(bt);
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   bt = elm_button_add(win);
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   elm_object_text_set(bt, "Button 2");
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   evas_object_size_hint_weight_set(bt, EVAS_HINT_EXPAND, 0.0);
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   evas_object_size_hint_align_set(bt, 1.0, 0.5);
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   evas_object_smart_callback_add(bt, "clicked", _unpack_cb, &tdata);
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   elm_box_pack_end(bx, bt);
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   evas_object_show(bt);
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   bt = elm_button_add(win);
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   elm_object_text_set(bt, "Button 3");
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   evas_object_smart_callback_add(bt, "clicked", _unpack_cb, &tdata);
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   elm_box_pack_end(bx, bt);
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   evas_object_show(bt);
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   tdata.box = bx;
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   tdata.last_layout = evas_object_box_layout_horizontal;
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   tdata.transitions = eina_list_append(tdata.transitions,
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                                        evas_object_box_layout_vertical);
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   tdata.transitions = eina_list_append(tdata.transitions,
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                                        evas_object_box_layout_horizontal);
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   tdata.transitions = eina_list_append(tdata.transitions,
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                                        evas_object_box_layout_stack);
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   tdata.transitions = eina_list_append(tdata.transitions,
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                                        evas_object_box_layout_homogeneous_vertical);
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   tdata.transitions = eina_list_append(tdata.transitions,
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                                        evas_object_box_layout_homogeneous_horizontal);
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   tdata.transitions = eina_list_append(tdata.transitions,
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                                        evas_object_box_layout_flow_vertical);
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   tdata.transitions = eina_list_append(tdata.transitions,
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                                        evas_object_box_layout_flow_horizontal);
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   tdata.transitions = eina_list_append(tdata.transitions,
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                                        evas_object_box_layout_stack);
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   elm_box_layout_set(bx, evas_object_box_layout_horizontal, NULL, NULL);
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   _test_box_transition_change(&tdata);
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   evas_object_resize(win, 300, 320);
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   evas_object_show(win);
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   elm_run();
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   return 0;
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}
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ELM_MAIN()
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