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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace grapher
{
public class Field
{
#region Constants
public const string DefaultFormatString = "0.#########";
#endregion Constants
#region Enumerations
public enum FieldState
{
Undefined,
Default,
Typing,
Entered,
Unavailable,
}
#endregion Enumerations
#region Constructors
public Field(TextBox box, Form containingForm, double defaultData)
{
DefaultText = DecimalString(defaultData);
Box = box;
Data = defaultData;
DefaultData = defaultData;
State = FieldState.Undefined;
ContainingForm = containingForm;
FormatString = DefaultFormatString;
box.KeyDown += new System.Windows.Forms.KeyEventHandler(KeyDown);
box.Leave += new System.EventHandler(FocusLeave);
SetToDefault();
}
#endregion Constructors
#region Properties
public TextBox Box { get; }
private Form ContainingForm { get; }
public double Data { get; private set; }
public string FormatString { get; set; }
public string DefaultText { get; }
public FieldState State { get; private set; }
public FieldState PreviousState { get; private set; }
private double DefaultData { get; }
#endregion Properties
#region Methods
public void SetToDefault()
{
if (State != FieldState.Default)
{
Box.BackColor = Color.White;
Box.ForeColor = Color.Gray;
State = FieldState.Default;
PreviousState = FieldState.Default;
}
Data = DefaultData;
Box.Text = DefaultText;
ContainingForm.ActiveControl = null;
}
public void SetToTyping()
{
if (State != FieldState.Typing)
{
Box.BackColor = Color.White;
Box.ForeColor = Color.Black;
PreviousState = State;
State = FieldState.Typing;
}
Box.Text = Data.ToString();
}
public void SetToEntered()
{
if (State != FieldState.Entered)
{
Box.BackColor = Color.AntiqueWhite;
Box.ForeColor = Color.DarkGray;
PreviousState = State;
State = FieldState.Entered;
}
ContainingForm.ActiveControl = null;
}
public void SetToEntered(double value)
{
SetToEntered();
Data = value;
Box.Text = DecimalString(Data);
}
public void SetToUnavailable()
{
if (State != FieldState.Unavailable)
{
Box.BackColor = Color.LightGray;
Box.ForeColor = Color.LightGray;
Box.Text = string.Empty;
PreviousState = State;
State = FieldState.Unavailable;
}
}
public void KeyDown(object sender, KeyEventArgs e)
{
switch(State)
{
case FieldState.Default:
if (e.KeyCode == Keys.Enter)
{
SetToDefault();
}
else
{
SetToTyping();
}
break;
case FieldState.Entered:
if (e.KeyCode != Keys.Enter)
{
SetToTyping();
}
break;
case FieldState.Typing:
HandleTyping(sender, e);
break;
case FieldState.Unavailable:
Box.Text = string.Empty;
ContainingForm.ActiveControl = null;
break;
default:
break;
}
}
private void FocusLeave(object sender, EventArgs e)
{
if (State == FieldState.Typing)
{
TextToData();
}
}
private void HandleTyping(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
TextToData();
e.Handled = true;
e.SuppressKeyPress = true;
}
else if (e.KeyCode == Keys.Escape)
{
ContainingForm.ActiveControl = null;
e.Handled = true;
e.SuppressKeyPress = true;
}
}
private void TextToData()
{
try
{
Data = Convert.ToDouble(Box.Text);
}
catch
{
}
Box.Text = DecimalString(Data);
if (string.Equals(Box.Text, DefaultText))
{
SetToDefault();
}
else
{
SetToEntered();
}
}
private string DecimalString(double value)
{
return value.ToString(FormatString);
}
#endregion Methods
}
}
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