Pinta.Core.SimpleHistoryItem.Dispose C# (CSharp) Method

        public override void Dispose()
        {
            // Free up native surface
            (old_surface as IDisposable).Dispose ();
        }

        // Clean up resources when live preview is disabled.
        void CleanUp()
        {
            Debug.WriteLine(DateTime.Now.ToString("HH:mm:ss:ffff") + " LivePreviewManager.CleanUp()");

            live_preview_enabled = false;

            if (effect != null)
            {
                if (effect.EffectData != null)
                {
                    effect.EffectData.PropertyChanged -= EffectData_PropertyChanged;
                }
                effect = null !;
            }

            live_preview_surface?.Dispose();
            live_preview_surface = null !;

            if (renderer != null)
            {
                renderer.Dispose();
                renderer = null !;
            }

            if (history_item != null)
            {
                history_item.Dispose();
                history_item = null !;
            }

            // Hide progress dialog and clean up events.
            var dialog = PintaCore.Chrome.ProgressDialog;

            dialog.Hide();
            dialog.Canceled -= HandleProgressDialogCancel;

            PintaCore.Chrome.MainWindowBusy = false;
        }