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