Separate classes into files, add Field class for text box state

1 files changed, 130 insertions, 0 deletions

diff --git a/grapher/Field.cs b/grapher/Field.cs
new file mode 100644
index 0000000..641bb2a
--- /dev/null
+++ b/grapher/Field.cs
@@ -0,0 +1,130 @@
+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 Enums
+
+        public enum FieldState
+        {
+            Undefined,
+            Default,
+            Typing,
+            Entered,
+            Unavailable,
+        }
+
+        #endregion Enums
+
+
+        #region Constructors
+
+        public Field(string defaultText, TextBox box, double defaultData)
+        {
+            DefaultText = defaultText;
+            Box = box;
+            Data = defaultData;
+            State = FieldState.Undefined;
+            box.KeyDown += KeyDown;
+
+            SetToDefault();
+        }
+
+        #endregion Constructors
+
+        #region Properties
+
+        TextBox Box { get; }
+
+        public double Data { get; private set; }
+
+        public string DefaultText { get; }
+
+        public FieldState State { get; private set; }
+
+        #endregion Properties
+
+        #region Methods
+
+        public void SetToDefault()
+        {
+            if (State != FieldState.Default)
+            {
+                Box.BackColor = Color.AntiqueWhite;
+                Box.ForeColor = Color.Gray;
+                Box.Text = DefaultText;
+                State = FieldState.Default;
+            }
+        }
+
+        public void SetToTyping()
+        {
+            if (State != FieldState.Typing)
+            {
+                Box.BackColor = Color.White;
+                Box.ForeColor = Color.Black;
+                State = FieldState.Typing;
+            }
+        }
+
+        public void SetToEntered()
+        {
+            if (State != FieldState.Entered)
+            {
+                Box.BackColor = Color.White;
+                Box.ForeColor = Color.DarkGray;
+                State = FieldState.Entered;
+            }
+        }
+
+        public void SetToUnavailable()
+        {
+            if (State != FieldState.Unavailable)
+            {
+                Box.BackColor = Color.LightGray;
+                Box.ForeColor = Color.LightGray;
+                Box.Text = string.Empty;
+            }
+        }
+
+        public void KeyDown(object sender, KeyEventArgs e)
+        {
+            if (TryHandleWithEnter(e, sender, out double data))
+            {
+                Data = data;
+            }
+        }
+
+        private bool TryHandleWithEnter(KeyEventArgs e, object sender, out double data)
+        {
+            bool validEntry = false;
+            data = 0.0;
+
+            if (e.KeyCode == Keys.Enter)
+            {
+                try
+                {
+                    data = Convert.ToDouble(((TextBox)sender).Text);
+                    validEntry = true;
+                }
+                catch
+                {
+                }
+
+                e.Handled = true;
+                e.SuppressKeyPress = true;
+            }
+
+            return validEntry;
+        }
+
+        #endregion Methods
+    }
+}