1 // Permission is hereby granted, free of charge, to any person obtaining
2 // a copy of this software and associated documentation files (the
3 // "Software"), to deal in the Software without restriction, including
4 // without limitation the rights to use, copy, modify, merge, publish,
5 // distribute, sublicense, and/or sell copies of the Software, and to
6 // permit persons to whom the Software is furnished to do so, subject to
7 // the following conditions:
9 // The above copyright notice and this permission notice shall be
10 // included in all copies or substantial portions of the Software.
12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20 // Copyright (c) 2005-2006 Novell, Inc.
23 // Carlos Alberto Cortez <calberto.cortez@gmail.com>
28 namespace System.Windows.Forms
30 class NumericTextBox : TextBox
35 // Last valid value for the numeric textbox
47 OnValueChanged (EventArgs.Empty);
60 protected override void OnLostFocus (EventArgs args)
62 // Update to the last valid value
63 string val = Value.ToString ();
67 base.OnLostFocus (args);
70 protected override void OnTextChanged (EventArgs args)
72 // Try to set the value to the new text.
73 // Otherwise keep the old one.
75 string text = Text.Length == 0 ? "0" : Text;
76 double new_value = Double.Parse (text);
79 } catch (FormatException) {
80 } catch (OverflowException) {
83 base.OnTextChanged (args);
86 protected override void OnKeyPress (KeyPressEventArgs args)
88 string acceptable = "\b.01234567890";
89 if (acceptable.IndexOf (args.KeyChar) < 0)
92 base.OnKeyPress (args);
95 protected virtual void OnValueChanged (EventArgs args)
97 EventHandler eh = (EventHandler)(Events [ValueChangedEvent]);
102 static object ValueChangedEvent = new object ();
103 public event EventHandler ValueChanged {
104 add { Events.AddHandler (ValueChangedEvent, value); }
105 remove { Events.RemoveHandler (ValueChangedEvent, value); }