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