1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
#include <stdio.h>
#include <string.h>
#include "textscreen.h"
typedef enum
{
OP_NONE,
OP_PLUS,
OP_MINUS,
OP_MULT,
OP_DIV,
} operator_t;
int starting_input = 0;
int input_value = 0;
txt_label_t *input_box;
int first_operand;
operator_t operator = OP_NONE;
void UpdateInputBox(void)
{
char buf[20];
sprintf(buf, " %i", input_value);
TXT_SetLabel(input_box, buf);
}
void InsertNumber(TXT_UNCAST_ARG(button), TXT_UNCAST_ARG(value))
{
TXT_CAST_ARG(int, value);
if (starting_input)
{
input_value = 0;
starting_input = 0;
}
input_value *= 10;
input_value += *value;
UpdateInputBox();
}
void AddNumberButton(txt_table_t *table, int value)
{
char buf[10];
int *val_copy;
val_copy = malloc(sizeof(int));
*val_copy = value;
sprintf(buf, " %i ", value);
TXT_AddWidget(table, TXT_NewButton2(buf, InsertNumber, val_copy));
}
void Operator(TXT_UNCAST_ARG(button), TXT_UNCAST_ARG(op))
{
TXT_CAST_ARG(operator_t, op);
first_operand = input_value;
operator = *op;
starting_input = 1;
}
void AddOperatorButton(txt_table_t *table, char *label, operator_t op)
{
char buf[10];
operator_t *op_copy;
op_copy = malloc(sizeof(operator_t));
*op_copy = op;
sprintf(buf, " %s ", label);
TXT_AddWidget(table, TXT_NewButton2(buf, Operator, op_copy));
}
void Calculate(TXT_UNCAST_ARG(button), void *unused)
{
switch (operator)
{
case OP_PLUS:
input_value = first_operand + input_value;
break;
case OP_MINUS:
input_value = first_operand - input_value;
break;
case OP_MULT:
input_value = first_operand * input_value;
break;
case OP_DIV:
input_value = first_operand / input_value;
break;
case OP_NONE:
break;
}
UpdateInputBox();
operator = OP_NONE;
starting_input = 1;
}
void BuildGUI()
{
txt_window_t *window;
txt_table_t *table;
window = TXT_NewWindow("Calculator");
input_box = TXT_NewLabel("asdf");
TXT_SetBGColor(input_box, TXT_COLOR_BLACK);
TXT_AddWidget(window, input_box);
TXT_AddWidget(window, TXT_NewSeparator(NULL));
TXT_AddWidget(window, TXT_NewStrut(0, 1));
table = TXT_NewTable(4);
TXT_AddWidget(window, table);
TXT_SetWidgetAlign(table, TXT_HORIZ_CENTER);
AddNumberButton(table, 7);
AddNumberButton(table, 8);
AddNumberButton(table, 9);
AddOperatorButton(table, "*", OP_MULT);
AddNumberButton(table, 4);
AddNumberButton(table, 5);
AddNumberButton(table, 6);
AddOperatorButton(table, "-", OP_MINUS);
AddNumberButton(table, 1);
AddNumberButton(table, 2);
AddNumberButton(table, 3);
AddOperatorButton(table, "+", OP_PLUS);
AddNumberButton(table, 0);
TXT_AddWidget(table, NULL);
TXT_AddWidget(table, TXT_NewButton2(" = ", Calculate, NULL));
AddOperatorButton(table, "/", OP_DIV);
TXT_AddWidget(window, TXT_NewStrut(0, 1));
UpdateInputBox();
}
int main(int argc, char *argv[])
{
TXT_Init();
TXT_SetDesktopTitle("Calculator demo");
BuildGUI();
TXT_GUIMainLoop();
TXT_Shutdown();
return 0;
}
|
