Example C Calculator app
For simplicity, only integer operations and no direct editing of the numbers. This is meant as a simple UI example, not as a CS exercise.
This commit is contained in:
Xavi Artigas
parent
95c373e8e3
commit
8caeaaf071
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project(
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'efl-example-calculator', 'c',
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version : '0.0.1',
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default_options: [ 'c_std=gnu99', 'warning_level=2' ],
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meson_version : '>= 0.38.0')
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eina = dependency('eina', version : '>=1.20.99')
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efl = dependency('efl-ui', version : '>=1.20.99')
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elm = dependency('elementary', version : '>=1.20.99')
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inc = include_directories('.')
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subdir('src')
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#define EFL_BETA_API_SUPPORT 1
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#include <Elementary.h>
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#include <Efl_Ui.h>
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// Temporary workaround until Unified Text stops using Legacy classes internally
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#include <efl_ui_text.eo.h>
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#include <efl_text_interactive.eo.h>
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static Efl_Ui_Text *_screen = NULL;
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static int _prev_value = 0, _curr_value = 0;
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static char _operation = '=';
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static Eina_Bool _must_overwrite = EINA_FALSE;
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static void
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_gui_quit_cb(void *data EINA_UNUSED, const Efl_Event *event EINA_UNUSED)
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{
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efl_exit(0);
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}
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static void
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_operate()
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{
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switch (_operation)
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{
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case '+':
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_curr_value += _prev_value;
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break;
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case '-':
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_curr_value = _prev_value - _curr_value;
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break;
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case '*':
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_curr_value *= _prev_value;
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break;
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case '/':
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_curr_value = _prev_value / _curr_value;
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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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static void
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_button_pressed_cb(void *data, const Efl_Event *event EINA_UNUSED)
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{
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char button = ((const char *)data)[0];
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if (button >= '0' && button <= '9')
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{
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char str[2] = { button, '\0' };
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if (_must_overwrite)
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{
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efl_text_set(_screen, "");
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_must_overwrite = EINA_FALSE;
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}
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Efl_Text_Cursor_Cursor *cursor = efl_text_cursor_get(_screen, EFL_TEXT_CURSOR_GET_TYPE_MAIN);
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efl_text_cursor_text_insert(_screen, cursor, str);
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}
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else
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{
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char str[32] = "";
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switch (button)
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{
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case 'C':
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efl_text_set(_screen, "0");
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break;
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case '+':
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case '-':
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case '*':
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case '/':
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case '=':
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if (_operation != '=')
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{
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_operate();
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snprintf(str, sizeof(str), "%d", _curr_value);
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efl_text_set(_screen, str);
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}
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_operation = button;
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_must_overwrite = EINA_TRUE;
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_prev_value = _curr_value;
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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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static void
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_screen_changed_cb(void *data EINA_UNUSED, const Efl_Event *event EINA_UNUSED)
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{
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char _text[32] = "";
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const char *str = efl_text_get(_screen);
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int d;
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if ((strcmp(str, "") == 0) || (strcmp(str, "-") == 0))
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{
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snprintf(_text, sizeof(_text), "0");
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}
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else if (sscanf(str, "%d", &d) == 1)
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{
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snprintf(_text, sizeof(_text), "%d", d);
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_curr_value = d;
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}
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if (strncmp(_text, str, sizeof(_text)))
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{
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efl_text_set(_screen, _text);
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}
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}
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// text is what is drawn on the button, which might be a multi-byte unicode string.
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// command is a single-char id for the button.
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static void
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_button_add(Efl_Ui_Table *table, const char *text, const char *command, int posx, int posy, int r, int g, int b)
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{
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Efl_Ui_Button *button =
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efl_add(EFL_UI_BUTTON_CLASS, table,
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efl_pack_table(table, efl_added, posx, posy, 1, 1),
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efl_event_callback_add(efl_added, EFL_INPUT_EVENT_CLICKED, _button_pressed_cb, command));
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// Buttons can only have simple text (no font, styles or markup) but can swallow
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// any other object we want.
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// Therefore we create a more complex Efl_Ui_Text object and use it as content for the button.
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Efl_Ui_Text *label =
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efl_add(EFL_UI_TEXT_CLASS, button,
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efl_text_interactive_editable_set(efl_added, EINA_FALSE),
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efl_text_halign_set(efl_added, 0.5),
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efl_text_valign_set(efl_added, 0.5),
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efl_gfx_color_set(efl_added, r, g, b, 255),
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efl_text_set(efl_added, text));
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efl_text_font_set(label, "Sans", 36);
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efl_content_set(button, label);
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}
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static void
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_gui_setup()
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{
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Eo *win, *table;
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win = efl_add(EFL_UI_WIN_CLASS, efl_main_loop_get(),
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efl_ui_win_type_set(efl_added, EFL_UI_WIN_TYPE_BASIC),
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efl_text_set(efl_added, "EFL Calculator"),
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efl_ui_win_autodel_set(efl_added, EINA_TRUE));
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// when the user clicks "close" on a window there is a request to delete
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efl_event_callback_add(win, EFL_UI_WIN_EVENT_DELETE_REQUEST, _gui_quit_cb, NULL);
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table = efl_add(EFL_UI_TABLE_CLASS, win,
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efl_content_set(win, efl_added),
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efl_pack_table_size_set(efl_added, 4, 5),
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efl_gfx_hint_size_min_set(efl_added, EINA_SIZE2D(300, 400)));
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_button_add(table, "1", "1", 0, 3, 255, 255, 255);
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_button_add(table, "2", "2", 1, 3, 255, 255, 255);
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_button_add(table, "3", "3", 2, 3, 255, 255, 255);
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_button_add(table, "4", "4", 0, 2, 255, 255, 255);
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_button_add(table, "5", "5", 1, 2, 255, 255, 255);
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_button_add(table, "6", "6", 2, 2, 255, 255, 255);
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_button_add(table, "7", "7", 0, 1, 255, 255, 255);
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_button_add(table, "8", "8", 1, 1, 255, 255, 255);
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_button_add(table, "9", "9", 2, 1, 255, 255, 255);
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_button_add(table, "0", "0", 1, 4, 255, 255, 255);
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_button_add(table, "+", "+", 3, 1, 128, 128, 128);
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_button_add(table, "−", "-", 3, 2, 128, 128, 128);
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_button_add(table, "×", "*", 3, 3, 128, 128, 128);
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_button_add(table, "÷", "/", 3, 4, 128, 128, 128);
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_button_add(table, "=", "=", 2, 4, 128, 128, 128);
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_button_add(table, "C", "C", 0, 4, 0, 0, 0);
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_screen = efl_add(EFL_UI_TEXT_CLASS, table,
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efl_text_set(efl_added, "0"),
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efl_text_multiline_set(efl_added, EINA_FALSE),
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efl_text_interactive_editable_set(efl_added, EINA_FALSE),
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efl_text_interactive_selection_allowed_set(efl_added, EINA_FALSE),
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efl_pack_table(table, efl_added, 0, 0, 4, 1),
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efl_text_halign_set(efl_added, 0.9),
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efl_text_valign_set(efl_added, 0.5),
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efl_text_effect_type_set(efl_added, EFL_TEXT_STYLE_EFFECT_TYPE_GLOW),
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efl_text_glow_color_set(efl_added, 128, 128, 128, 128),
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efl_event_callback_add(efl_added, EFL_UI_TEXT_EVENT_CHANGED,
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_screen_changed_cb, NULL));
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efl_text_font_set(_screen, "Sans", 48);
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}
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EAPI_MAIN void
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efl_main(void *data EINA_UNUSED, const Efl_Event *ev EINA_UNUSED)
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{
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_gui_setup();
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}
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EFL_MAIN()
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@ -0,0 +1,12 @@
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src = files([
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'calculator.c',
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])
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deps = [eina, efl, elm]
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executable('efl_example_calculator', src,
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dependencies : deps,
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include_directories : inc,
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install : true
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)
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