From 54fbed833005cf4933108160a0175df4d42f5df7 Mon Sep 17 00:00:00 2001
From: Simon <33755707+Crotex@users.noreply.github.com>
Date: Thu, 9 Jan 2020 14:12:58 +0100
Subject: [PATCH] Added paging

- Navigation via 'm' and 'n'
---
 menu.c | 85 +++++++++++++++++++++++++++++++++++-----------------------
 menu.h | 19 ++++++++++---
 2 files changed, 66 insertions(+), 38 deletions(-)

diff --git a/menu.c b/menu.c
index c516898..982c135 100644
--- a/menu.c
+++ b/menu.c
@@ -40,11 +40,59 @@ void get_console_dimensions(int* width, int* height)
 	*height = csbi.srWindow.Bottom - csbi.srWindow.Top + 1;
 }
 
-void show_menu(const int itemc, const struct MenuItem itemv[], const char title[], const bool loopback, const bool pause, const struct MenuBorder *border)
+void page(const struct MenuPage *pages, const size_t page_count) {
+	unsigned int page_index = 0;
+	bool action_performed, loop, pageChanged = true;
+	char pageKey, itemKey;
+
+	do {
+		do {
+			show_menu(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;
+			pageKey = _getch();
+
+			if (pageKey == 'm')
+				page_index < page_count - 1 ? page_index++ : page_index;
+			else if (pageKey == 'n') 
+				page_index > 0 ? page_index-- : page_index;
+			else {
+				pageChanged = false;
+				itemKey = pageKey;
+				do {
+					action_performed = false;
+
+					itemKey != pageKey ? itemKey = _getch() : pageKey;
+					pageKey = 0;
+					for (int 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 || pageChanged);
+
+		page_index = 0;
+	} while (1);
+}
+
+void show_menu(const int itemc, const struct MenuItem itemv[], const char title[], const struct MenuBorder *border)
 {
 	unsigned width, height, item_index;
-	char key;
-	bool action_performed;
 
 	// Clear the console window
 	system("cls");
@@ -132,35 +180,4 @@ void show_menu(const int itemc, const struct MenuItem itemv[], const char title[
 			i != height - 2 ? putchar(border->line_vertical) : 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, border);
-	}
 }
\ No newline at end of file
diff --git a/menu.h b/menu.h
index 67c905a..92981a7 100644
--- a/menu.h
+++ b/menu.h
@@ -2,6 +2,8 @@
 
 #include "pch.h"
 
+
+
 /// <summary>Represents one menu item in a menu.</summary>
 struct MenuItem {
 	char* text;
@@ -9,6 +11,8 @@ struct MenuItem {
 	void* (*action)(void);
 };
 
+
+
 /// <summary>Represents a border in which a menu is displayed.</summary>
 struct MenuBorder {
 	char line_vertical;
@@ -23,11 +27,18 @@ struct MenuBorder {
 
 const extern struct MenuBorder DEFAULT, MODERN, NO_BORDER, SOLID;
 
-/// <summary>Displaces a CUI menu to the user and lets them choose an option, then calls the corresponding function.</summary>
+/// <summary>Represents a page in the menu.</summary>
+struct MenuPage {
+	const struct MenuItem* items;
+	const size_t item_count;
+	char* title;
+	bool loopback, pause;
+	const struct MenuBorder* border;
+};
+
+/// <summary>Displaces a CUI menu to the user</summary>
 /// <param name="itemc">The length of the array <c>itemv</c> of menu items.</param>
 /// <param name="itemv">An array of all menu items to display in the menu.</param>
 /// <param name="title">The title of the menu.</param>
-/// <param name="loopback">If this parameter is set to <c>true</c>, the menu will be displayed again after an action is executed.</param>
-/// <param name="pause">If this parameter is set to <c>true</c>, a <c>pause</c>command will be run after an action is executed.</param>
 /// <param name="border">Specifies the border in which the menu is displayed.</param>
-void show_menu(const int itemc, const struct MenuItem itemv[], const char title[], const bool loopback, const bool pause, const struct MenuBorder *border);
\ No newline at end of file
+void show_menu(const int itemc, const struct MenuItem itemv[], const char title[], const struct MenuBorder *border);
\ No newline at end of file