Mercurial > MadButterfly
annotate examples/calculator/main.c @ 90:bd29780bf266
Reduce redundant code
| author | Thinker K.F. Li <thinker@branda.to> |
|---|---|
| date | Sat, 23 Aug 2008 22:23:44 +0800 |
| parents | 90428161fc61 |
| children | 3f619ae03678 |
| rev | line source |
|---|---|
| 88 | 1 #include <stdio.h> |
| 2 #include <mb_types.h> | |
| 3 #include <X_supp.h> | |
| 4 #include <shapes.h> | |
| 5 #include <tools.h> | |
| 6 #include "calculator_scr.h" | |
| 7 | |
| 8 typedef struct _ex_rt ex_rt_t; | |
| 9 struct _ex_rt { | |
| 10 X_MB_runtime_t *rt; | |
| 11 calculator_scr_t *code; | |
| 12 }; | |
| 13 | |
| 14 static struct { | |
| 15 int c; | |
| 16 int off; | |
| 17 } tgt_list[] = { | |
| 18 { 0, OFFSET(calculator_scr_t, but_0) }, | |
| 19 { 1, OFFSET(calculator_scr_t, but_1) }, | |
| 20 { 2, OFFSET(calculator_scr_t, but_2) }, | |
| 21 { 3, OFFSET(calculator_scr_t, but_3) }, | |
| 22 { 4, OFFSET(calculator_scr_t, but_4) }, | |
| 23 { 5, OFFSET(calculator_scr_t, but_5) }, | |
| 24 { 6, OFFSET(calculator_scr_t, but_6) }, | |
| 25 { 7, OFFSET(calculator_scr_t, but_7) }, | |
| 26 { 8, OFFSET(calculator_scr_t, but_8) }, | |
| 27 { 9, OFFSET(calculator_scr_t, but_9) }, | |
| 28 { '+', OFFSET(calculator_scr_t, but_add) }, | |
| 29 { '-', OFFSET(calculator_scr_t, but_minus) }, | |
| 30 { '*', OFFSET(calculator_scr_t, but_mul) }, | |
| 31 { '/', OFFSET(calculator_scr_t, but_div) }, | |
| 32 { '=', OFFSET(calculator_scr_t, but_eq) }, | |
| 33 { 'c', OFFSET(calculator_scr_t, but_clr) } | |
| 34 }; | |
| 35 | |
| 36 static int real_compute(int op, int v1, int v2) { | |
| 37 int r = v2; | |
| 38 | |
| 39 switch(op) { | |
| 40 case '+': | |
| 41 r = v1 + v2; | |
| 42 break; | |
| 43 case '-': | |
| 44 r = v1 - v2; | |
| 45 break; | |
| 46 case '*': | |
| 47 r = v1 * v2; | |
| 48 break; | |
| 49 case '/': | |
|
89
90428161fc61
Prevent divide by zero error
Thinker K.F. Li <thinker@branda.to>
parents:
88
diff
changeset
|
50 if(v2) |
|
90428161fc61
Prevent divide by zero error
Thinker K.F. Li <thinker@branda.to>
parents:
88
diff
changeset
|
51 r = v1 / v2; |
|
90428161fc61
Prevent divide by zero error
Thinker K.F. Li <thinker@branda.to>
parents:
88
diff
changeset
|
52 else |
|
90428161fc61
Prevent divide by zero error
Thinker K.F. Li <thinker@branda.to>
parents:
88
diff
changeset
|
53 r = v1; |
| 88 | 54 break; |
| 55 } | |
| 56 | |
| 57 return r; | |
| 58 } | |
| 59 | |
| 90 | 60 static void show_text(ex_rt_t *ex_rt, int num, const char *prefix) { |
| 88 | 61 char buf[20]; |
| 62 | |
| 90 | 63 sprintf(buf, "%s%d", prefix, num); |
| 88 | 64 sh_text_set_text(ex_rt->code->screen_text, buf); |
| 65 rdman_shape_changed(ex_rt->rt->rdman, ex_rt->code->screen_text); | |
| 66 } | |
| 67 | |
| 68 static void compute(ex_rt_t *ex_rt, coord_t *tgt) { | |
| 69 int i; | |
| 70 coord_t **coord_p; | |
| 71 static int num = 0; | |
| 90 | 72 static int saved = 0, saved2 = 0; |
| 73 static int op = 0, op1 = 0; | |
| 88 | 74 |
| 75 for(i = 0; i < 16; i++) { | |
| 76 coord_p = (coord_t **)((void *)ex_rt->code + tgt_list[i].off); | |
| 77 if(*coord_p == (void *)tgt) | |
| 78 break; | |
| 79 } | |
| 80 if(i >= 16) return; | |
| 81 | |
| 82 if(i < 10) { | |
| 83 num = num * 10 + i; | |
| 90 | 84 show_text(ex_rt, num, ""); |
| 88 | 85 } else { |
| 86 switch(tgt_list[i].c) { | |
| 87 case 'c': | |
| 88 saved = num = 0; | |
| 90 | 89 show_text(ex_rt, 0, ""); |
| 88 | 90 break; |
| 91 | |
| 92 case '+': | |
| 93 case '-': | |
| 94 case '*': | |
| 95 case '/': | |
| 96 saved = real_compute(op, saved, num); | |
| 90 | 97 show_text(ex_rt, saved, "="); |
| 98 op = tgt_list[i].c; | |
| 99 saved2 = num; | |
| 88 | 100 num = 0; |
| 101 break; | |
| 102 | |
| 103 case '=': | |
| 90 | 104 saved = real_compute(op, saved, saved2); |
| 105 show_text(ex_rt, saved, "="); | |
| 88 | 106 num = 0; |
| 107 break; | |
| 108 } | |
| 109 } | |
| 110 rdman_redraw_changed(ex_rt->rt->rdman); | |
| 111 } | |
| 112 | |
| 113 static void buttons_handler(event_t *evt, void *arg) { | |
| 114 ex_rt_t *ex_rt = (ex_rt_t *)arg; | |
| 115 | |
| 116 switch(evt->type) { | |
| 117 case EVT_MOUSE_BUT_PRESS: | |
| 118 compute(ex_rt, (coord_t *)evt->cur_tgt); | |
| 119 break; | |
| 120 } | |
| 121 } | |
| 122 | |
| 123 static void setup_observers(ex_rt_t *ex_rt) { | |
| 124 calculator_scr_t *calculator_scr; | |
| 125 ob_factory_t *factory; | |
| 126 subject_t *subject; | |
| 90 | 127 coord_t *coord; |
| 128 int off; | |
| 129 int i; | |
| 88 | 130 |
| 131 calculator_scr = ex_rt->code; | |
| 132 factory = rdman_get_ob_factory(ex_rt->rt->rdman); | |
| 133 | |
| 90 | 134 for(i = 0; i < 16; i++) { |
| 135 off = tgt_list[i].off; | |
| 136 coord = *(coord_t **)((void *)calculator_scr + off); | |
| 137 subject = coord_get_mouse_event(coord); | |
| 138 subject_add_observer(factory, subject, buttons_handler, ex_rt); | |
| 139 } | |
| 88 | 140 } |
| 141 | |
| 142 int main(int argc, char * const argv[]) { | |
| 143 X_MB_runtime_t rt; | |
| 144 calculator_scr_t *calculator_scr; | |
| 145 ex_rt_t ex_rt; | |
| 146 int r; | |
| 147 | |
| 148 r = X_MB_init(":0.0", 300, 400, &rt); | |
| 149 | |
| 150 calculator_scr = calculator_scr_new(rt.rdman); | |
| 151 | |
| 152 ex_rt.rt = &rt; | |
| 153 ex_rt.code = calculator_scr; | |
| 154 setup_observers(&ex_rt); | |
| 155 | |
| 156 X_MB_handle_connection(&rt); | |
| 157 | |
| 158 calculator_scr_free(calculator_scr); | |
| 159 X_MB_destroy(&rt); | |
| 160 | |
| 161 return 0; | |
| 162 } |