CraftSynth.ImageEditor – Rev 1

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using System.Collections.Generic;

namespace CraftSynth.ImageEditor
{
        /// <summary>
        /// Delete All command
        /// </summary>
        internal class CommandDeleteAll : Command
        {
                private List<DrawObject> cloneList;

                // Create this command BEFORE applying Delete All function.
                public CommandDeleteAll(Layers list)
                {
                        cloneList = new List<DrawObject>();

                        // Make clone of the whole list.
                        // Add objects in reverse order because GraphicsList.Add
                        // insert every object to the beginning.
                        int n = list[list.ActiveLayerIndex].Graphics.Count;

                        for (int i = n - 1; i >= 0; i--)
                        {
                                cloneList.Add(list[list.ActiveLayerIndex].Graphics[i].Clone());
                        }
                }

                public override void Undo(Layers list)
                {
                        // Add all objects from clone list to list -
                        // opposite to DeleteAll
                        foreach (DrawObject o in cloneList)
                        {
                                list[list.ActiveLayerIndex].Graphics.Add(o);
                        }
                }

                public override void Redo(Layers list)
                {
                        // Clear list - make DeleteAll again
                        list[list.ActiveLayerIndex].Graphics.Clear();
                }

                #region Destruction
                // Flag: Has Dispose already been called? 
                bool _disposed = false;

                // Protected implementation of Dispose pattern. 
                public override void Dispose(bool disposing)
                {
                        if (!this._disposed)
                        {

                                if (disposing)
                                {
                                        // Free any managed objects here. 
                                        //
                                        if (this.cloneList != null)
                                        {
                                                foreach (DrawObject drawObject in cloneList)
                                                {
                                                        if (drawObject != null)
                                                        {
                                                                drawObject.Dispose();
                                                        }
                                                }
                                        }
                                }

                                // Free any unmanaged objects here. 
                                //

                                this._disposed = true;
                        }
                }

                ~CommandDeleteAll()
                {
                         this.Dispose(false);
                }
                #endregion
        }
}

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