UserInterface.cs

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using System;
using System.Collections.Generic;
using System.Text;

namespace HouseOver
{
    public class UserInterface
    {
        private int width = 80;
        private int height = 25;
        private int contentHeight;
                private string header;
                private string footer;
                
                public UserInterface()
                {
            string title = "The House And Realty Manager";
            string version = "v. 0.01a";
            string headSeparator = "¨";
            string enterChoiceString = "Enter your choice: ";
            string footSeparator = "_";

            // Generate the header contents
            int topSpace = width - (title.Length + version.Length);
            header = title;
            for (int i = 0; i < topSpace; i++)
                header += " ";
            header += version;
            for (int i = 0; i < width; i++)
                header += headSeparator;
            header += System.Environment.NewLine;

            // Generate the footer contents
            for (int i = 0; i < width; i++)
                footer += footSeparator;
            footer += enterChoiceString;

            // Content height is set to the height of the console, minus the height of the header and footer
            contentHeight = height - 4;
        }

        private void DoDraw(string content, params object[] arg)
        {
            // It fails to count the last newline
            int contentSize = content.Split(System.Environment.NewLine.ToCharArray(0, 1)).Length;
            int separateThisMuchTop = Convert.ToInt32(Math.Floor(Convert.ToDouble(this.contentHeight - contentSize) / 2));
            int separateThisMuchBottom = this.contentHeight - (contentSize + separateThisMuchTop);

            // We shouldn't be drawing anything taller than the screen... but oh well
            if (separateThisMuchTop < 0 || separateThisMuchBottom < 0)
            {
                separateThisMuchTop = 0;
                separateThisMuchBottom = 0;
            }

            Console.Clear();
            Console.Write(header);

            for (int i = 0; i < separateThisMuchTop; i++)
                Console.WriteLine("");
            Console.Write(content,arg);

            for (int i = 0; i < separateThisMuchBottom; i++)
                Console.WriteLine("");
            Console.Write(footer);
        }


        private void DoDraw(string content, string errorMessage, params object[] arg)
        {
            int contentSize = content.Split(System.Environment.NewLine.ToCharArray(0, 1)).Length + errorMessage.Split(System.Environment.NewLine.ToCharArray(0, 1)).Length + 1;
            int separateThisMuchTop = Convert.ToInt32(Math.Floor(Convert.ToDouble(contentHeight - contentSize) / 2));
            int separateThisMuchBottom = this.contentHeight - (contentSize + separateThisMuchTop);

            // We shouldn't be drawing anything taller than the screen... but oh well
            if (separateThisMuchTop < 0 || separateThisMuchBottom < 0)
            {
                separateThisMuchTop = 0;
                separateThisMuchBottom = 0;
            }

            Console.Clear();

            Console.Write(header);
            for (int i = 0; i < separateThisMuchTop; i++)
                Console.WriteLine("");

            Console.BackgroundColor = ConsoleColor.DarkRed;
            Console.ForegroundColor = ConsoleColor.White;
            Console.WriteLine(errorMessage);
            Console.ResetColor();

            Console.Write(System.Environment.NewLine + content, arg);

            for (int i = 0; i < separateThisMuchBottom; i++)
                Console.WriteLine("");
            Console.Write(footer);
        }

        public string Draw(string drawThis, params object[] arg)
                {
            DoDraw(drawThis, arg);
            return Console.ReadLine();
                }

        public int DrawInt(string drawThis, params object[] arg)
        {
            int theValue;
            string tempValue;

            DoDraw(drawThis, arg);

            while (true)
            {
                tempValue = Console.ReadLine();
                try
                {
                    theValue = Convert.ToInt32(tempValue);
                    break;
                }
                catch
                {
                    // If we've caught the exception, the user didn't enter an integer
                    DoDraw(drawThis, "You did not enter a number - please try again!", arg);
                }
            }

            return theValue;
        }

        public bool DrawMenu<T>(string drawThis, Dictionary<object,string> menuItems, bool showCancel, out T chosen)
        {
            string content;
            string theKey;
            ConsoleKeyInfo ki;
            int i = 0, it = 0;
            List<object> keys = new List<object>();

            // Generate the screen data
            content = drawThis + System.Environment.NewLine + System.Environment.NewLine + System.Environment.NewLine;

            foreach (KeyValuePair<object, string> menuItem in menuItems)
            {
                i++;
                keys.Add(menuItem.Key);
                content += "   " + i.ToString() + ". " + menuItem.Value + System.Environment.NewLine;
            }
            if (showCancel)
                content += "     - - - - - - - - - - - - -" + System.Environment.NewLine + "   0. Abort/ quit";

            // Get the selected item
            while (true)
            {
                // Do the actual drawing
                DoDraw(content);

                // Less than ten items... let the user simply press the key
                if (i < 10)
                {
                    ki = Console.ReadKey(true);
                    if (showCancel && ki.KeyChar.ToString() == "0")
                    {
                        chosen = default(T);
                        return false;
                    }
                    try
                    {
                        it = Convert.ToInt32(ki.KeyChar.ToString());
                        if (0 < it && it <= i)
                        {
                            // This is necessary to make sure we get the right object from the keys list..
                            it--;
                            // Set the chosen item
                            chosen = (T)keys[it];
                            // An item was chosen, so don't loop any longer - break out, run ree!
                            break;
                        }
                    }
                    catch (System.FormatException)
                    {
                        // Sod all, we just need to NOT CRASH!
                    }
                }
                else
                {
                    theKey = Console.ReadLine().Trim();
                    if (showCancel && theKey == "0")
                    {
                        chosen = default(T);
                        return false;
                    }
                    try
                    {
                        it = Convert.ToInt32(theKey);
                        if (0 < it && it <= i)
                        {
                            // This is necessary to make sure we get the right object from the keys list..
                            it--;
                            // Set the chosen item
                            chosen = (T)keys[it];
                            // An item was chosen, so don't loop any longer - break out, run ree!
                            break;
                        }
                    }
                    catch (System.FormatException)
                    {
                        // Sod all, we just need to NOT CRASH!
                    }
                }
            }
            return true;
        }
    }
}

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