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//
// Copyright(C) 2005-2014 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
//
// Example program: desktop calculator
//
#include <stdio.h>
#include <stdlib.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];
TXT_snprintf(buf, sizeof(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;
TXT_snprintf(buf, sizeof(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;
TXT_snprintf(buf, sizeof(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[])
{
if (!TXT_Init())
{
fprintf(stderr, "Failed to initialise GUI\n");
exit(-1);
}
TXT_SetDesktopTitle("Calculator demo");
BuildGUI();
TXT_GUIMainLoop();
TXT_Shutdown();
return 0;
}
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