1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
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
}
}
|