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Src/Xceed.Wpf.Toolkit/ButtonSpinner/Implementation/Spinner.cs

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+/*************************************************************************************
+
+   Extended WPF Toolkit
+
+   Copyright (C) 2007-2013 Xceed Software Inc.
+
+   This program is provided to you under the terms of the Microsoft Public
+   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 
+
+   For more features, controls, and fast professional support,
+   pick up the Plus Edition at http://xceed.com/wpf_toolkit
+
+   Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
+
+  ***********************************************************************************/
+
+using System;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace Xceed.Wpf.Toolkit
+{
+  /// <summary>
+  /// Base class for controls that represents controls that can spin.
+  /// </summary>
+  public abstract class Spinner : Control
+  {
+    #region Properties
+
+    /// <summary>
+    /// Identifies the ValidSpinDirection dependency property.
+    /// </summary>
+    public static readonly DependencyProperty ValidSpinDirectionProperty = DependencyProperty.Register( "ValidSpinDirection", typeof( ValidSpinDirections ), typeof( Spinner ), new PropertyMetadata( ValidSpinDirections.Increase | ValidSpinDirections.Decrease, OnValidSpinDirectionPropertyChanged ) );
+    public ValidSpinDirections ValidSpinDirection
+    {
+      get
+      {
+        return ( ValidSpinDirections )GetValue( ValidSpinDirectionProperty );
+      }
+      set
+      {
+        SetValue( ValidSpinDirectionProperty, value );
+      }
+    }
+
+    /// <summary>
+    /// ValidSpinDirectionProperty property changed handler.
+    /// </summary>
+    /// <param name="d">ButtonSpinner that changed its ValidSpinDirection.</param>
+    /// <param name="e">Event arguments.</param>
+    private static void OnValidSpinDirectionPropertyChanged( DependencyObject d, DependencyPropertyChangedEventArgs e )
+    {
+      Spinner source = ( Spinner )d;
+      ValidSpinDirections oldvalue = ( ValidSpinDirections )e.OldValue;
+      ValidSpinDirections newvalue = ( ValidSpinDirections )e.NewValue;
+      source.OnValidSpinDirectionChanged( oldvalue, newvalue );
+    }
+
+    #endregion //Properties
+
+    /// <summary>
+    /// Occurs when spinning is initiated by the end-user.
+    /// </summary>
+    public event EventHandler<SpinEventArgs> Spin;
+
+    /// <summary>
+    /// Initializes a new instance of the Spinner class.
+    /// </summary>
+    protected Spinner()
+    {
+    }
+
+    /// <summary>
+    /// Raises the OnSpin event when spinning is initiated by the end-user.
+    /// </summary>
+    /// <param name="e">Spin event args.</param>
+    protected virtual void OnSpin( SpinEventArgs e )
+    {
+      ValidSpinDirections valid = e.Direction == SpinDirection.Increase ? ValidSpinDirections.Increase : ValidSpinDirections.Decrease;
+
+      //Only raise the event if spin is allowed.
+      if( ( ValidSpinDirection & valid ) == valid )
+      {
+        EventHandler<SpinEventArgs> handler = Spin;
+        if( handler != null )
+        {
+          handler( this, e );
+        }
+      }
+    }
+
+    /// <summary>
+    /// Called when valid spin direction changed.
+    /// </summary>
+    /// <param name="oldValue">The old value.</param>
+    /// <param name="newValue">The new value.</param>
+    protected virtual void OnValidSpinDirectionChanged( ValidSpinDirections oldValue, ValidSpinDirections newValue )
+    {
+    }
+  }
+}