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menu-lib/menu.c
2019-12-21 20:15:59 +01:00

139 lines
3.3 KiB
C

#include "pch.h"
#include "framework.h"
#include "menu.h"
// Checks if a line index should display a menu item
bool is_item_line(const int line, const int itemc, int* item_index)
{
if (line >= 2 && line % 2 == 0)
{
// Lines 2, 4, ...
*item_index = (line - 2) / 2;
return *item_index < itemc;
}
return false;
}
// Acquires the dimensions (width and height) of the console window
void get_console_dimensions(int* width, int* height)
{
CONSOLE_SCREEN_BUFFER_INFO csbi;
GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi);
*width = csbi.srWindow.Right - csbi.srWindow.Left + 1;
*height = csbi.srWindow.Bottom - csbi.srWindow.Top + 1;
}
void show_menu(const int itemc, struct MenuItem itemv[], const char title[], bool loopback, bool pause, enum MenuStyle style)
{
unsigned width, height, item_index;
char key;
bool action_performed;
// Clear the console window
system("cls");
// Get the width and height of the console window
get_console_dimensions(&width, &height);
// Print frame with title
for (unsigned i = 0; i < height - 1; ++i)
{
// Top line with title
if (i == 0)
{
for (unsigned j = 0; j < width - strlen(title) - 1; ++j)
{
if (j == ((width - strlen(title)) - 2)/ 2)
{
style == DEFAULT ? putchar('*') : style == MODERN ? putchar('[') : putchar(' ');
fputs(title, stdout);
style == DEFAULT ? putchar('*') : style == MODERN ? putchar('[') : putchar(' ');
}
else
{
style == DEFAULT ? putchar('*') : style == MODERN ? putchar('-') : putchar(' ');
}
}
}
// Line with menu item
else if (is_item_line(i, itemc, &item_index))
{
// Print item text
style == DEFAULT ? putchar('*') : style == MODERN ? putchar('|') : putchar(' ');
if (strcmp(itemv[item_index].text, "BLANK") == 0) {
putchar('\t');
// BLANK equals 5 characters
// + 3 since it regularly is "%c) " inbetween title and key
for (unsigned j = 0; j < 8; ++j)
{
putchar(' ');
}
}
else {
printf("\t%c) %s", itemv[item_index].key, itemv[item_index].text);
}
// Print right side of frame
for (unsigned j = 0; j < width - strlen(itemv[item_index].text) - 12; ++j)
{
putchar(' ');
}
style == DEFAULT ? putchar('*') : style == MODERN ? putchar('|') : putchar(' ');
}
// Line above bottom line
else if (i == height - 3)
{
for (unsigned j = 0; j < width; ++j)
{
style == DEFAULT ? putchar('*') : style == MODERN ? putchar('-') : putchar(' ');
}
}
// Blank line
else
{
i != height - 2 ? style == DEFAULT ? putchar('*') : style == MODERN ? putchar('|') : putchar(' ') : putchar(' ');
for (unsigned j = 0; j < width - 2; ++j)
{
putchar(' ');
}
i != height - 2 ? style == DEFAULT ? putchar('*') : style == MODERN ? putchar('|') : putchar(' ') : putchar(' ');
}
}
// Wait for user selection
putchar('>');
putchar(' ');
action_performed = false;
do {
key = _getch();
for (int i = 0; i < itemc; ++i)
{
if (itemv[i].key == key)
{
// Perform action
system("cls");
itemv[i].action();
action_performed = true;
// Pause if requested
if (pause)
{
putchar('\n');
system("pause");
}
}
}
} while (!action_performed);
// Show menu again if requested
if (loopback)
{
show_menu(itemc, itemv, title, loopback, pause, style);
}
}