ZoomSliderVSX - Visual Studio Extension (VSX) 2010

/* ZoomSliderVSX - Visual Studio 2010 Extention 
 * Developed By : Abhijit Jana
 * Last Modified : 8-Feb-2010
 * Description : Scrollable Zooming Features For VS 2010 IDE
 */
using System;
using System.Windows.Controls;
using System.Windows.Media;
using Microsoft.VisualStudio.Text.Editor;

namespace ZoomSliderVSX
{
    /// <summary>
    /// A class detailing the margin's visual definition including both size and content.
    /// </summary>
    class ZoomSlider : Canvas, IWpfTextViewMargin
    {
        // The IWpfTextView that our margin will be attached to.
        private IWpfTextView _textView;

        // The name of the margin
        public const string MarginName = "ZoomSlideBar";

        // A flag stating whether this margin has been disposed
        private bool _isDisposed = false;

        //Slider WPF User Control 
        private SliderControl _slider = null;

        /// <summary>
        /// Creates a <see cref="ZoomSlider"/> for a given <see cref="IWpfTextView"/>.
        /// </summary>
        /// <param name="textView">The <see cref="IWpfTextView"/> to attach the margin to.</param>
        public ZoomSlider(IWpfTextView textView)
        {
            // Set the IWpfTextView
            _textView = textView;

           // Establish the background of the margin.
            this.Height = 30;
            this.ClipToBounds = true;
            this.Background = new SolidColorBrush(Color.FromArgb(60, 41,57, 85));
            
            //Set Direction of Control
            this.FlowDirection = System.Windows.FlowDirection.RightToLeft;
            
            //Add Event handler for for LayoutChanges Event
            _textView.LayoutChanged += this.OnLayoutChanged;
          
            //Create New instance for WPF Slider Control
            _slider = new SliderControl(_textView);

            //Add Control
            this.Children.Add(_slider);
        }
        /// <summary>
        /// Layout Changed Event
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void OnLayoutChanged(object sender, TextViewLayoutChangedEventArgs e)
        {
            if (_slider != null)
                _slider.UpdateSlider();

        }

        private void ThrowIfDisposed()
        {
            if (_isDisposed)
                throw new ObjectDisposedException(MarginName);
        }

        #region IWpfTextViewMargin Members

        /// <summary>
        /// The <see cref="Sytem.Windows.FrameworkElement"/> that implements the visual representation
        /// of the margin.
        /// </summary>
        public System.Windows.FrameworkElement VisualElement
        {
            // Since this margin implements Canvas, this is the object which renders
            // the margin.
            get
            {
                ThrowIfDisposed();
                return this;
            }
        }

        #endregion

        #region ITextViewMargin Members

        public double MarginSize
        {
            // Since this is a horizontal margin, its width will be bound to the width of the text view.
            // Therefore, its size is its height.
            get
            {
                ThrowIfDisposed();
                return this.ActualHeight;
            }
        }

        public bool Enabled
        {
            // The margin should always be enabled
            get
            {
                ThrowIfDisposed();
                return true;
            }
        }

        /// <summary>
        /// Returns an instance of the margin if this is the margin that has been requested.
        /// </summary>
        /// <param name="marginName">The name of the margin requested</param>
        /// <returns>An instance of ZoomSliderVSX or null</returns>
        public ITextViewMargin GetTextViewMargin(string marginName)
        {
            return (marginName == ZoomSlider.MarginName) ? (IWpfTextViewMargin)this : null;
        }

        // Dispose of the margin
        public void Dispose()
        {
            if (!_isDisposed)
            {
                GC.SuppressFinalize(this);
                _isDisposed = true;
            }
        }
        #endregion
    }
}