wpftoolkit/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/MultiLineTextEditor/Implementation/MultiLineTextEditor.cs

/************************************************************************

   Extended WPF Toolkit

   Copyright (C) 2010-2012 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 

   This program can be provided to you by Xceed Software Inc. under a
   proprietary commercial license agreement for use in non-Open Source
   projects. The commercial version of Extended WPF Toolkit also includes
   priority technical support, commercial updates, and many additional 
   useful WPF controls if you license Xceed Business Suite for WPF.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;

namespace Xceed.Wpf.Toolkit
{
  [TemplatePart( Name = PART_ResizeThumb, Type = typeof( Thumb ) )]
  public class MultiLineTextEditor : ContentControl
  {
    private const string PART_ResizeThumb = "PART_ResizeThumb";

    #region Members

    Thumb _resizeThumb;

    #endregion //Members

    #region Properties

    public static readonly DependencyProperty DropDownHeightProperty = DependencyProperty.Register( "DropDownHeight", typeof( double ), typeof( MultiLineTextEditor ), new UIPropertyMetadata( 150.0 ) );
    public double DropDownHeight
    {
      get
      {
        return ( double )GetValue( DropDownHeightProperty );
      }
      set
      {
        SetValue( DropDownHeightProperty, value );
      }
    }

    public static readonly DependencyProperty DropDownWidthProperty = DependencyProperty.Register( "DropDownWidth", typeof( double ), typeof( MultiLineTextEditor ), new UIPropertyMetadata( 200.0 ) );
    public double DropDownWidth
    {
      get
      {
        return ( double )GetValue( DropDownWidthProperty );
      }
      set
      {
        SetValue( DropDownWidthProperty, value );
      }
    }

    #region IsOpen

    public static readonly DependencyProperty IsOpenProperty = DependencyProperty.Register( "IsOpen", typeof( bool ), typeof( MultiLineTextEditor ), new UIPropertyMetadata( false, OnIsOpenChanged ) );
    public bool IsOpen
    {
      get
      {
        return ( bool )GetValue( IsOpenProperty );
      }
      set
      {
        SetValue( IsOpenProperty, value );
      }
    }

    private static void OnIsOpenChanged( DependencyObject o, DependencyPropertyChangedEventArgs e )
    {
      MultiLineTextEditor multiLineTextEditor = o as MultiLineTextEditor;
      if( multiLineTextEditor != null )
        multiLineTextEditor.OnIsOpenChanged( ( bool )e.OldValue, ( bool )e.NewValue );
    }

    protected virtual void OnIsOpenChanged( bool oldValue, bool newValue )
    {

    }

    #endregion //IsOpen

    public static readonly DependencyProperty IsSpellCheckEnabledProperty = DependencyProperty.Register( "IsSpellCheckEnabled", typeof( bool ), typeof( MultiLineTextEditor ), new UIPropertyMetadata( false ) );
    public bool IsSpellCheckEnabled
    {
      get
      {
        return ( bool )GetValue( IsSpellCheckEnabledProperty );
      }
      set
      {
        SetValue( IsSpellCheckEnabledProperty, value );
      }
    }


    #region Text

    public static readonly DependencyProperty TextProperty = DependencyProperty.Register( "Text", typeof( string ), typeof( MultiLineTextEditor ), new FrameworkPropertyMetadata( String.Empty, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, OnTextChanged ) );
    public string Text
    {
      get
      {
        return ( string )GetValue( TextProperty );
      }
      set
      {
        SetValue( TextProperty, value );
      }
    }

    private static void OnTextChanged( DependencyObject o, DependencyPropertyChangedEventArgs e )
    {
      MultiLineTextEditor textEditor = o as MultiLineTextEditor;
      if( textEditor != null )
        textEditor.OnTextChanged( ( string )e.OldValue, ( string )e.NewValue );
    }

    protected virtual void OnTextChanged( string oldValue, string newValue )
    {

    }

    #endregion //Text

    public static readonly DependencyProperty TextAlignmentProperty = DependencyProperty.Register( "TextAlignment", typeof( TextAlignment ), typeof( MultiLineTextEditor ), new UIPropertyMetadata( TextAlignment.Left ) );
    public TextAlignment TextAlignment
    {
      get
      {
        return ( TextAlignment )GetValue( TextAlignmentProperty );
      }
      set
      {
        SetValue( TextAlignmentProperty, value );
      }
    }

    public static readonly DependencyProperty TextWrappingProperty = DependencyProperty.Register( "TextWrapping", typeof( TextWrapping ), typeof( MultiLineTextEditor ), new UIPropertyMetadata( TextWrapping.NoWrap ) );
    public TextWrapping TextWrapping
    {
      get
      {
        return ( TextWrapping )GetValue( TextWrappingProperty );
      }
      set
      {
        SetValue( TextWrappingProperty, value );
      }
    }


    #endregion //Properties

    #region Constructors

    static MultiLineTextEditor()
    {
      DefaultStyleKeyProperty.OverrideMetadata( typeof( MultiLineTextEditor ), new FrameworkPropertyMetadata( typeof( MultiLineTextEditor ) ) );
    }

    public MultiLineTextEditor()
    {
      Keyboard.AddKeyDownHandler( this, OnKeyDown );
      Mouse.AddPreviewMouseDownOutsideCapturedElementHandler( this, OnMouseDownOutsideCapturedElement );
    }

    #endregion //Constructors

    #region Bass Class Overrides

    public override void OnApplyTemplate()
    {
      base.OnApplyTemplate();

      if( _resizeThumb != null )
        _resizeThumb.DragDelta -= ResizeThumb_DragDelta;

      _resizeThumb = GetTemplateChild( PART_ResizeThumb ) as Thumb;

      if( _resizeThumb != null )
        _resizeThumb.DragDelta += ResizeThumb_DragDelta;
    }

    #endregion //Bass Class Overrides

    #region Event Handlers

    private void OnKeyDown( object sender, KeyEventArgs e )
    {
      switch( e.Key )
      {
        case Key.Escape:
        case Key.Tab:
          {
            CloseEditor();
            break;
          }
      }
    }

    private void OnMouseDownOutsideCapturedElement( object sender, MouseButtonEventArgs e )
    {
      CloseEditor();
    }

    void ResizeThumb_DragDelta( object sender, DragDeltaEventArgs e )
    {
      double yadjust = DropDownHeight + e.VerticalChange;
      double xadjust = DropDownWidth + e.HorizontalChange;

      if( ( xadjust >= 0 ) && ( yadjust >= 0 ) )
      {
        DropDownWidth = xadjust;
        DropDownHeight = yadjust;
      }
    }

    #endregion //Event Handlers

    #region Methods

    private void CloseEditor()
    {
      if( IsOpen )
        IsOpen = false;
      ReleaseMouseCapture();
    }

    #endregion //Methods
  }
}