DocToolkit/DragDropManager.cs

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#region Using directives

using System;
using System.Windows.Forms;
using System.Diagnostics;

#endregion

namespace DocToolkit
{
    /// <summary>
    /// DragDropManager class allows to open files dropped from 
    /// Windows Explorer in Windows Form application.
    /// 
    /// Using:
    /// 1) Write function which opens file selected from MRU:
    ///
    /// private void dragDropManager_FileDroppedEvent(object sender, FileDroppedEventArgs e)
    /// {
    ///    // open file(s) from e.FileArray:
    ///    // e.FileArray.GetValue(0).ToString() ...
    /// }
    ///     
    /// 2) Add member of this class to the parent form:
    ///  
    /// private DragDropManager dragDropManager;
    /// 
    /// 3) Create class instance in parent form initialization code:
    ///  
    /// dragDropManager = new DragDropManager(this);
    /// dragDropManager.FileDroppedEvent += dragDropManager_FileDroppedEvent; 
    /// 
    /// </summary>
    public class DragDropManager
    {
        private Form frmOwner;          // reference to owner form

        // Event raised when drops file(s) to the form
        public event FileDroppedEventHandler FileDroppedEvent;

        public DragDropManager(Form owner)
        {
            frmOwner = owner;

            // ensure that parent form allows dropping
            frmOwner.AllowDrop = true;

            // subscribe to parent form's drag-drop events
            frmOwner.DragEnter += OnDragEnter;
            frmOwner.DragDrop += OnDragDrop;
        }


        /// <summary>
        /// Handle parent form DragEnter event
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void OnDragEnter(object sender, System.Windows.Forms.DragEventArgs e)
        {