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menu-lib/menu.c
Simon c5063870e0 Bug fixes
Fix a bug which caused page scrolling to fail with invalid input order
2020-01-16 08:26:10 +01:00

198 lines
4.5 KiB
C

#include "pch.h"
#include "framework.h"
#include "menu.h"
const struct MenuBorder DEFAULT = {
'*', '*', '*', '*', '*', '*', '[', ']'
};
const struct MenuBorder MODERN = {
'|', '-', '-', '-', '-', '-', '[', ']'
};
const struct MenuBorder NO_BORDER = {
' ', ' ', ' ', ' ', ' ' ,' ' ,' ' ,' '
};
const struct MenuBorder SOLID = {
186, 205, 201, 187, 200, 188, '[', ']'
};
void print_content(const int itemc, const struct MenuItem itemv[], const char title[], const struct MenuBorder* border);
void show_menu(const struct MenuPage* pages, const size_t page_count, const bool infinite_loop)
{
unsigned int page_index = 0;
bool action_performed, loop, page_changed = true;
char page_key, itemKey;
int i;
do {
do {
print_content(pages[page_index].item_count, pages[page_index].items, pages[page_index].title, pages[page_index].border);
// Wait for user selection
putchar('>');
putchar(' ');
loop = pages[page_index].loopback;
page_key = _getch();
// Forward paging
if (page_key == 'm' && page_index < page_count - 1)
++page_index;
// Backward paging
else if (page_key == 'n' && page_index > 0)
--page_index;
else
{
if (page_key == 'n' || page_key == 'm')
break;
page_changed = false;
itemKey = page_key;
do {
action_performed = false;
itemKey != page_key ? itemKey = _getch() : page_key;
page_key = 0;
for (i = 0; i < pages[page_index].item_count; ++i)
{
if (pages[page_index].items[i].key == itemKey)
{
// Perform action
system("cls");
pages[page_index].items[i].action();
action_performed = true;
// Pause if requested
if (pages[page_index].pause)
{
putchar('\n');
system("pause");
}
}
}
} while (!action_performed);
}
} while (loop || page_changed);
page_index = 0;
} while (infinite_loop);
}
// 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;
}
// Draws a menu to the console
void print_content(const int itemc, const struct MenuItem itemv[], const char title[], const struct MenuBorder* border)
{
unsigned width, height, item_index;
// 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)
{
// Upper left corner
putchar(border->corner_upper_left);
for (unsigned j = 1; j < width - strlen(title) - 2; ++j)
{
if (j == ((width - strlen(title)) - 2) / 2)
{
putchar(border->title_left);
fputs(title, stdout);
putchar(border->title_right);
}
else
{
putchar(border->line_horizontal);
}
}
// Upper right corner
putchar(border->corner_upper_right);
}
// Line with menu item
else if (is_item_line(i, itemc, &item_index))
{
// Print item text
putchar(border->line_vertical);
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(' ');
}
putchar(border->line_vertical);
}
// Line above bottom line
else if (i == height - 3)
{
// Lower left corner
putchar(border->corner_lower_left);
for (unsigned j = 1; j < width - 1; ++j)
{
putchar(border->line_horizontal);
}
// Lower right corner
putchar(border->corner_lower_right);
}
// Blank line
else
{
i != height - 2 ? putchar(border->line_vertical) : putchar(' ');
for (unsigned j = 0; j < width - 2; ++j)
{
putchar(' ');
}
i != height - 2 ? putchar(border->line_vertical) : putchar(' ');
}
}
}