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// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Copyright (c) 2005-2006 Novell, Inc.
//
// Authors:
// Carlos Alberto Cortez <calberto.cortez@gmail.com>
//
using System;
namespace System.Windows.Forms
{
class NumericTextBox : TextBox
{
double val;
double min;
// Last valid value for the numeric textbox
public double Value {
get {
return val;
}
set {
if (value == val)
return;
if (value < min)
value = min;
val = value;
OnValueChanged (EventArgs.Empty);
}
}
public double Min {
get {
return min;
}
set {
min = value;
}
}
protected override void OnLostFocus (EventArgs args)
{
// Update to the last valid value
string val = Value.ToString ();
if (Text != val)
Text = val;
base.OnLostFocus (args);
}
protected override void OnTextChanged (EventArgs args)
{
// Try to set the value to the new text.
// Otherwise keep the old one.
try {
string text = Text.Length == 0 ? "0" : Text;
double new_value = Double.Parse (text);
Value = new_value;
} catch (FormatException) {
} catch (OverflowException) {
}
base.OnTextChanged (args);
}
protected override void OnKeyPress (KeyPressEventArgs args)
{
string acceptable = "\b.01234567890";
if (acceptable.IndexOf (args.KeyChar) < 0)
args.Handled = true;
base.OnKeyPress (args);
}
protected virtual void OnValueChanged (EventArgs args)
{
EventHandler eh = (EventHandler)(Events [ValueChangedEvent]);
if (eh != null)
eh (this, args);
}
static object ValueChangedEvent = new object ();
public event EventHandler ValueChanged {
add { Events.AddHandler (ValueChangedEvent, value); }
remove { Events.RemoveHandler (ValueChangedEvent, value); }
}
}
}
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