openpdn /src/AppWorkspace.cs

Language C# Lines 2325
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/////////////////////////////////////////////////////////////////////////////////
// Paint.NET                                                                   //
// Copyright (C) dotPDN LLC, Rick Brewster, Tom Jackson, and contributors.     //
// Portions Copyright (C) Microsoft Corporation. All Rights Reserved.          //
// See src/Resources/Files/License.txt for full licensing and attribution      //
// details.                                                                    //
// .                                                                           //
/////////////////////////////////////////////////////////////////////////////////

using PaintDotNet.Actions;
using PaintDotNet.Base;
using PaintDotNet.HistoryFunctions;
using PaintDotNet.HistoryMementos;
using PaintDotNet.SystemLayer;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Globalization;
using System.Reflection;
using System.Windows.Forms;

namespace PaintDotNet
{
    internal class AppWorkspace
        : UserControl,
          ISnapObstacleHost
    {
        private readonly string _cursorInfoStatusBarFormat = PdnResources.GetString("StatusBar.CursorInfo.Format");
        private readonly string _imageInfoStatusBarFormat = PdnResources.GetString("StatusBar.Size.Format");

        private Type _defaultToolTypeChoice;

        private Type _globalToolTypeChoice;
        private bool _globalRulersChoice;

        private DocumentWorkspace _activeDocumentWorkspace;

        // if a new workspace is added, and this workspace is not dirty, then it will be removed. 
        // This keeps track of the last workspace added via CreateBlankDocumentInNewWorkspace (if 
        // true was passed for its 2nd parameter)
        private DocumentWorkspace _initialWorkspace; 

        private readonly List<DocumentWorkspace> _documentWorkspaces = new List<DocumentWorkspace>();
        private readonly WorkspaceWidgets _widgets;

        private Panel _workspacePanel;
        private PdnStatusBar _statusBar;

        private ToolsForm _mainToolBarForm;
        private LayerForm _layerForm;
        private HistoryForm _historyForm;
        private ColorsForm _colorsForm;

        private MostRecentFiles _mostRecentFiles;
        private const int DefaultMostRecentFilesMax = 8;

        private SnapObstacleController _snapObstacle;
        private bool _addedToSnapManager;
        private int _ignoreUpdateSnapObstacle;
        private int _suspendThumbnailUpdates;

        public void CheckForUpdates()
        {
            ToolBar.MainMenu.CheckForUpdates();
        }

        public IDisposable SuspendThumbnailUpdates()
        {
            var resumeFn = new CallbackOnDispose(ResumeThumbnailUpdates);

            ++_suspendThumbnailUpdates;

            if (_suspendThumbnailUpdates == 1)
            {
                Widgets.DocumentStrip.SuspendThumbnailUpdates();
                Widgets.LayerControl.SuspendLayerPreviewUpdates();
            }

            return resumeFn;
        }

        private void ResumeThumbnailUpdates()
        {
            --_suspendThumbnailUpdates;

            if (_suspendThumbnailUpdates != 0) return;
            Widgets.DocumentStrip.ResumeThumbnailUpdates();
            Widgets.LayerControl.ResumeLayerPreviewUpdates();
        }

        public Type DefaultToolType
        {
            get
            {
                return _defaultToolTypeChoice;
            }

            set
            {
                _defaultToolTypeChoice = value;
                Settings.CurrentUser.SetString(SettingNames.DefaultToolTypeName, value.Name);
            }
        }

        public Type GlobalToolTypeChoice
        {
            get
            {
                return _globalToolTypeChoice;
            }

            set
            {
                _globalToolTypeChoice = value;

                if (ActiveDocumentWorkspace != null)
                {
                    ActiveDocumentWorkspace.SetToolFromType(value);
                }
            }
        }

        public DocumentWorkspace InitialWorkspace
        {
            set
            {
                _initialWorkspace = value;
            }
        }

        public event EventHandler RulersEnabledChanged;
        protected virtual void OnRulersEnabledChanged()
        {
            if (RulersEnabledChanged != null)
            {
                RulersEnabledChanged(this, EventArgs.Empty);
            }
        }

        public bool RulersEnabled
        {
            get
            {
                return _globalRulersChoice;
            }

            set
            {
                if (_globalRulersChoice == value) return;
                _globalRulersChoice = value;

                if (ActiveDocumentWorkspace != null)
                {
                    ActiveDocumentWorkspace.RulersEnabled = value;
                }

                OnRulersEnabledChanged();
            }
        }

        private void DocumentWorkspaceDrawGridChanged(object sender, EventArgs e)
        {
            DrawGrid = _activeDocumentWorkspace.DrawGrid;
        }

        private void ViewConfigStripDrawGridChanged(object sender, EventArgs e)
        {
            DrawGrid = ((ViewConfigStrip)sender).DrawGrid;
        }

        private bool DrawGrid
        {
            get
            {
                return Widgets.ViewConfigStrip.DrawGrid;
            }

            set
            {
                if (Widgets.ViewConfigStrip.DrawGrid != value)
                {
                    Widgets.ViewConfigStrip.DrawGrid = value;
                }

                if (_activeDocumentWorkspace != null && _activeDocumentWorkspace.DrawGrid != value)
                {
                    _activeDocumentWorkspace.DrawGrid = value;
                }

                Settings.CurrentUser.SetBoolean(SettingNames.DrawGrid, DrawGrid);
            }
        }

        public event EventHandler UnitsChanged;
        protected virtual void OnUnitsChanged()
        {
            if (UnitsChanged != null)
            {
                UnitsChanged(this, EventArgs.Empty);
            }
        }

        public MeasurementUnit Units
        {
            get
            {
                return _widgets.ViewConfigStrip.Units;
            }

            set
            {
                _widgets.ViewConfigStrip.Units = value;
            }
        }

        public SnapObstacle SnapObstacle
        {
            get
            {
                if (_snapObstacle == null)
                {
                    // HACK: for some reason retrieving the ClientRectangle can raise a VisibleChanged event
                    //       so we initially pass in Rectangle.Empty for the rectangle bounds
                    _snapObstacle = new SnapObstacleController(
                        Name,
                        Rectangle.Empty,
                        SnapRegion.Interior,
                        true) {EnableSave = false};

                    var pdbForm = FindForm() as PdnBaseForm;
                    if (pdbForm != null)
                    {
                        pdbForm.Moving += ParentFormMoving;
                        pdbForm.Move += ParentFormMove;
                        pdbForm.ResizeEnd += ParentFormResizeEnd;
                        pdbForm.Layout += ParentFormLayout;
                        pdbForm.SizeChanged += ParentFormSizeChanged;
                    }

                    UpdateSnapObstacle();
                }

                return _snapObstacle;
            }
        }

        private void ParentFormMove(object sender, EventArgs e)
        {
            UpdateSnapObstacle();
        }

        private void ParentFormSizeChanged(object sender, EventArgs e)
        {
            UpdateSnapObstacle();
        }

        private void ParentFormLayout(object sender, LayoutEventArgs e)
        {
            UpdateSnapObstacle();
        }

        private void ParentFormResizeEnd(object sender, EventArgs e)
        {
            UpdateSnapObstacle();
        }

        private void ParentFormMoving(object sender, MovingEventArgs e)
        {
            UpdateSnapObstacle();
        }

        private void SuspendUpdateSnapObstacle()
        {
            ++_ignoreUpdateSnapObstacle;
        }

        private void ResumeUpdateSnapObstacle()
        {
            --_ignoreUpdateSnapObstacle;
        }

        private void UpdateSnapObstacle()
        {
            if (_ignoreUpdateSnapObstacle > 0)
            {
                return;
            }

            if (_snapObstacle == null)
            {
                return;
            }

            if (!_addedToSnapManager)
            {
                SnapManager sm = SnapManager.FindMySnapManager(this);

                if (sm != null)
                {
                    SnapObstacle so = SnapObstacle;

                    if (!_addedToSnapManager)
                    {
                        sm.AddSnapObstacle(SnapObstacle);
                        _addedToSnapManager = true;

                        FindForm().Shown += AppWorkspaceShown;
                    }
                }
            }

            {
                Rectangle clientRect = ActiveDocumentWorkspace != null ? ActiveDocumentWorkspace.VisibleViewRectangle : _workspacePanel.ClientRectangle;

                Rectangle screenRect = _workspacePanel.RectangleToScreen(clientRect);
                _snapObstacle.SetBounds(screenRect);
                _snapObstacle.Enabled = Visible && Enabled;
            }
        }

        private void AppWorkspaceShown(object sender, EventArgs e)
        {
            UpdateSnapObstacle();
        }

        protected override void OnLayout(LayoutEventArgs levent)
        {
            UpdateSnapObstacle();
            base.OnLayout(levent);
        }

        protected override void OnLocationChanged(EventArgs e)
        {
            UpdateSnapObstacle();
            base.OnLocationChanged(e);
        }

        protected override void OnSizeChanged(EventArgs e)
        {
            UpdateSnapObstacle();
            base.OnSizeChanged(e);
        }

        protected override void OnEnabledChanged(EventArgs e)
        {
            UpdateSnapObstacle();
            base.OnEnabledChanged(e);
        }

        protected override void OnVisibleChanged(EventArgs e)
        {
            UpdateSnapObstacle();
            base.OnVisibleChanged(e);
        }

        public void ResetFloatingForms()
        {
            ResetFloatingForm(Widgets.ToolsForm);
            ResetFloatingForm(Widgets.HistoryForm);
            ResetFloatingForm(Widgets.LayerForm);
            ResetFloatingForm(Widgets.ColorsForm);
        }

        public void ResetFloatingForm(FloatingToolForm ftf)
        {
            SnapManager sm = SnapManager.FindMySnapManager(this);

            if (ftf == Widgets.ToolsForm)
            {
                sm.ParkObstacle(Widgets.ToolsForm, this, HorizontalSnapEdge.Top, VerticalSnapEdge.Left);
            }
            else if (ftf == Widgets.HistoryForm)
            {
                sm.ParkObstacle(Widgets.HistoryForm, this, HorizontalSnapEdge.Top, VerticalSnapEdge.Right);
            }
            else if (ftf == Widgets.LayerForm)
            {
                sm.ParkObstacle(Widgets.LayerForm, this, HorizontalSnapEdge.Bottom, VerticalSnapEdge.Right);
            }
            else if (ftf == Widgets.ColorsForm)
            {
                sm.ParkObstacle(Widgets.ColorsForm, this, HorizontalSnapEdge.Bottom, VerticalSnapEdge.Left);
            }
            else
            {
                throw new ArgumentException();
            }
        }

        private readonly Set<Triple<Assembly, Type, Exception>> _effectLoadErrors = new Set<Triple<Assembly, Type, Exception>>();

        public void ReportEffectLoadError(Triple<Assembly, Type, Exception> error)
        {
            lock (_effectLoadErrors)
            {
                if (!_effectLoadErrors.Contains(error))
                {
                    _effectLoadErrors.Add(error);
                }
            }
        }

        public static string GetLocalizedEffectErrorMessage(Assembly assembly, Type type, Exception exception)
        {
            IPluginSupportInfo supportInfo;
            string typeName;

            if (type != null)
            {
                typeName = type.FullName;
                supportInfo = PluginSupportInfo.GetPluginSupportInfo(type);
            }
            else if (exception is TypeLoadException)
            {
                var asTlex = exception as TypeLoadException;
                typeName = asTlex.TypeName;
                supportInfo = PluginSupportInfo.GetPluginSupportInfo(assembly);
            }
            else
            {
                supportInfo = PluginSupportInfo.GetPluginSupportInfo(assembly);
                typeName = null;
            }

            return GetLocalizedEffectErrorMessage(assembly, typeName, supportInfo, exception);
        }

        public static string GetLocalizedEffectErrorMessage(Assembly assembly, string typeName, Exception exception)
        {
            IPluginSupportInfo supportInfo = PluginSupportInfo.GetPluginSupportInfo(assembly);
            return GetLocalizedEffectErrorMessage(assembly, typeName, supportInfo, exception);
        }

        private static string GetLocalizedEffectErrorMessage(Assembly assembly, string typeName, IPluginSupportInfo supportInfo, Exception exception)
        {
            string fileName = assembly.Location;
            string shortErrorFormat = PdnResources.GetString("EffectErrorMessage.ShortFormat");
            string fullErrorFormat = PdnResources.GetString("EffectErrorMessage.FullFormat");
            string notSuppliedText = PdnResources.GetString("EffectErrorMessage.InfoNotSupplied");

            string errorText;

            if (supportInfo == null)
            {
                errorText = string.Format(
                    shortErrorFormat,
                    fileName,
                    typeName ?? notSuppliedText,
                    exception);
            }
            else
            {
                errorText = string.Format(
                    fullErrorFormat,
                    fileName,
                    typeName ?? supportInfo.DisplayName ?? notSuppliedText,
                    (supportInfo.Version ?? new Version()),
                    supportInfo.Author ?? notSuppliedText,
                    supportInfo.Copyright ?? notSuppliedText,
                    (supportInfo.WebsiteUri == null ? notSuppliedText : supportInfo.WebsiteUri.ToString()),
                    exception);
            }

            return errorText;
        }

        public IList<Triple<Assembly, Type, Exception>> GetEffectLoadErrors()
        {
            return _effectLoadErrors.ToArray();
        }

        public void RunEffect(Type effectType)
        {
            // TODO: this is kind of a hack
            ToolBar.MainMenu.RunEffect(effectType);
        }

        public PdnToolBar ToolBar { get; private set; }

        private static ImageResource FileNewIcon
        {
            get
            {
                return PdnResources.GetImageResource("Icons.MenuFileNewIcon.png");
            }
        }

        private static ImageResource ImageFromDiskIcon
        {
            get
            {
                return PdnResources.GetImageResource("Icons.ImageFromDiskIcon.png");
            }
        }

        public MostRecentFiles MostRecentFiles
        {
            get { return _mostRecentFiles ?? (_mostRecentFiles = new MostRecentFiles(DefaultMostRecentFilesMax)); }
        }

        private void DocumentWorkspaceDocumentChanging(object sender, EventArgs<Document> e)
        {
            UI.SuspendControlPainting(this);
        }

        private void DocumentWorkspaceDocumentChanged(object sender, EventArgs e)
        {
            UpdateDocInfoInStatusBar();

            UI.ResumeControlPainting(this);
            Invalidate(true);
        }

        private void CoordinatesToStrings(int x, int y, out string xString, out string yString, out string unitsString)
        {
            _activeDocumentWorkspace.Document.CoordinatesToStrings(Units, x, y, out xString, out yString, out unitsString);
        }

        private void UpdateCursorInfoInStatusBar(int cursorX, int cursorY)
        {
            SuspendLayout();

            if (_activeDocumentWorkspace == null ||
                _activeDocumentWorkspace.Document == null)
            {
                _statusBar.CursorInfoText = string.Empty;
            }
            else
            {
                string xString;
                string yString;
                string units;

                CoordinatesToStrings(cursorX, cursorY, out xString, out yString, out units);

                string cursorText = string.Format(
                    CultureInfo.InvariantCulture,
                    _cursorInfoStatusBarFormat,
                    xString,
                    units,
                    yString,
                    units);

                _statusBar.CursorInfoText = cursorText;
            }

            ResumeLayout(false);
        }

        private void UpdateDocInfoInStatusBar()
        {
            if (_activeDocumentWorkspace == null ||
                _activeDocumentWorkspace.Document == null)
            {
                _statusBar.ImageInfoStatusText = string.Empty;
            }
            else
            {
                string widthString;
                string heightString;
                string units;

                CoordinatesToStrings(
                    _activeDocumentWorkspace.Document.Width,
                    _activeDocumentWorkspace.Document.Height,
                    out widthString,
                    out heightString,
                    out units);

                string imageText = string.Format(
                    CultureInfo.InvariantCulture,
                    _imageInfoStatusBarFormat,
                    widthString,
                    units,
                    heightString,
                    units);

                _statusBar.ImageInfoStatusText = imageText;
            }
        }

        [Browsable(false)]
        public WorkspaceWidgets Widgets
        {
            get
            {
                return _widgets;
            }
        }

        [Browsable(false)]
        public AppEnvironment AppEnvironment { get; private set; }

        [Browsable(false)]
        public DocumentWorkspace ActiveDocumentWorkspace
        {
            get
            {
                return _activeDocumentWorkspace;
            }

            set
            {
                if (value == _activeDocumentWorkspace) return;
                if (value != null &&
                    _documentWorkspaces.IndexOf(value) == -1)
                {
                    throw new ArgumentException("DocumentWorkspace was not created with AddNewDocumentWorkspace");
                }

                bool focused = false;
                if (_activeDocumentWorkspace != null)
                {
                    focused = _activeDocumentWorkspace.Focused;
                }

                UI.SuspendControlPainting(this);
                OnActiveDocumentWorkspaceChanging();
                _activeDocumentWorkspace = value;
                OnActiveDocumentWorkspaceChanged();
                UI.ResumeControlPainting(this);

                Refresh();

                if (value != null)
                {
                    value.Focus();
                }
            }
        }

        private void ActiveDocumentWorkspaceFirstInputAfterGotFocus(object sender, EventArgs e)
        {
            ToolBar.DocumentStrip.EnsureItemFullyVisible(ToolBar.DocumentStrip.SelectedDocumentIndex);
        }

        public DocumentWorkspace[] DocumentWorkspaces
        {
            get
            {
                return _documentWorkspaces.ToArray();
            }
        }

        public DocumentWorkspace AddNewDocumentWorkspace()
        {
            if (_initialWorkspace != null)
            {
                if (_initialWorkspace.Document == null || !_initialWorkspace.Document.Dirty)
                {
                    _globalToolTypeChoice = _initialWorkspace.GetToolType();
                    RemoveDocumentWorkspace(_initialWorkspace);
                    _initialWorkspace = null;
                }
            }

            var dw = new DocumentWorkspace {AppWorkspace = this};

            _documentWorkspaces.Add(dw);
            ToolBar.DocumentStrip.AddDocumentWorkspace(dw);

            return dw;
        }

        public Image GetDocumentWorkspaceThumbnail(DocumentWorkspace dw)
        {
            ToolBar.DocumentStrip.SyncThumbnails();
            Image[] images = ToolBar.DocumentStrip.DocumentThumbnails;
            DocumentWorkspace[] documents = ToolBar.DocumentStrip.DocumentList;

            for (int i = 0; i < documents.Length; ++i)
            {
                if (documents[i] == dw)
                {
                    return images[i];
                }
            }

            throw new ArgumentException("The requested DocumentWorkspace doesn't exist in this AppWorkspace");
        }

        public void RemoveDocumentWorkspace(DocumentWorkspace documentWorkspace)
        {
            int dwIndex = _documentWorkspaces.IndexOf(documentWorkspace);

            if (dwIndex == -1)
            {
                throw new ArgumentException("DocumentWorkspace was not created with AddNewDocumentWorkspace");
            }

            bool removingCurrentDW;
            if (ActiveDocumentWorkspace == documentWorkspace)
            {
                removingCurrentDW = true;
                _globalToolTypeChoice = documentWorkspace.GetToolType();
            }
            else
            {
                removingCurrentDW = false;
            }

            documentWorkspace.SetTool(null);

            // Choose new active DW if removing the current DW
            if (removingCurrentDW)
            {
                if (_documentWorkspaces.Count == 1)
                {
                    ActiveDocumentWorkspace = null;
                }
                else if (dwIndex == 0)
                {
                    ActiveDocumentWorkspace = _documentWorkspaces[1];
                }
                else
                {
                    ActiveDocumentWorkspace = _documentWorkspaces[dwIndex - 1];
                }
            }

            _documentWorkspaces.Remove(documentWorkspace);
            ToolBar.DocumentStrip.RemoveDocumentWorkspace(documentWorkspace);

            if (_initialWorkspace == documentWorkspace)
            {
                _initialWorkspace = null;
            }

            // Clean up the DocumentWorkspace
            Document document = documentWorkspace.Document;

            documentWorkspace.Document = null;
            document.Dispose();

            documentWorkspace.Dispose();
            documentWorkspace = null;
        }

        private void UpdateHistoryButtons()
        {
            if (ActiveDocumentWorkspace == null)
            {
                _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.Undo, false);
                _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.Redo, false);
            }
            else
            {
                _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.Undo,
                                                             ActiveDocumentWorkspace.History.UndoStack.Count > 1);

                _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.Redo,
                                                             ActiveDocumentWorkspace.History.RedoStack.Count > 0);
            }
        }

        private void HistoryChangedHandler(object sender, EventArgs e)
        {
            UpdateHistoryButtons();

            // some actions change the document size: make sure we update our status bar panel
            // TODO: shouldn't this be handled by our DocumentWorkspace.DocumentChanged handler...?
            UpdateDocInfoInStatusBar();
        }

        public event EventHandler ActiveDocumentWorkspaceChanging;
        protected virtual void OnActiveDocumentWorkspaceChanging()
        {
            SuspendUpdateSnapObstacle();

            if (ActiveDocumentWorkspaceChanging != null)
            {
                ActiveDocumentWorkspaceChanging(this, EventArgs.Empty);
            }

            if (_activeDocumentWorkspace != null)
            {
                _activeDocumentWorkspace.FirstInputAfterGotFocus +=
                    ActiveDocumentWorkspaceFirstInputAfterGotFocus;

                _activeDocumentWorkspace.RulersEnabledChanged -= DocumentWorkspaceRulersEnabledChanged;
                _activeDocumentWorkspace.DocumentMouseEnter -= DocumentMouseEnterHandler;
                _activeDocumentWorkspace.DocumentMouseLeave -= DocumentMouseLeaveHandler;
                _activeDocumentWorkspace.DocumentMouseMove -= DocumentMouseMoveHandler;
                _activeDocumentWorkspace.DocumentMouseDown -= DocumentMouseDownHandler;
                _activeDocumentWorkspace.Scroll -= DocumentWorkspaceScroll;
                _activeDocumentWorkspace.Layout -= DocumentWorkspaceLayout;
                _activeDocumentWorkspace.DrawGridChanged -= DocumentWorkspaceDrawGridChanged;
                _activeDocumentWorkspace.DocumentClick -= DocumentClick;
                _activeDocumentWorkspace.DocumentMouseUp -= DocumentMouseUpHandler;
                _activeDocumentWorkspace.DocumentKeyPress -= DocumentKeyPress;
                _activeDocumentWorkspace.DocumentKeyUp -= DocumenKeyUp;
                _activeDocumentWorkspace.DocumentKeyDown -= DocumentKeyDown;

                _activeDocumentWorkspace.History.Changed -= HistoryChangedHandler;
                _activeDocumentWorkspace.StatusChanged -= OnDocumentWorkspaceStatusChanged;
                _activeDocumentWorkspace.DocumentChanging -= DocumentWorkspaceDocumentChanging;
                _activeDocumentWorkspace.DocumentChanged -= DocumentWorkspaceDocumentChanged;
                _activeDocumentWorkspace.Selection.Changing -= SelectedPathChangingHandler;
                _activeDocumentWorkspace.Selection.Changed -= SelectedPathChangedHandler;
                _activeDocumentWorkspace.ScaleFactorChanged -= ZoomChangedHandler;
                _activeDocumentWorkspace.ZoomBasisChanged -= DocumentWorkspaceZoomBasisChanged;

                _activeDocumentWorkspace.Visible = false;
                _historyForm.HistoryControl.HistoryStack = null;

                _activeDocumentWorkspace.ToolChanging -= ToolChangingHandler;
                _activeDocumentWorkspace.ToolChanged -= ToolChangedHandler;

                if (_activeDocumentWorkspace.Tool != null)
                {
                    while (_activeDocumentWorkspace.Tool.IsMouseEntered)
                    {
                        _activeDocumentWorkspace.Tool.PerformMouseLeave();
                    }
                }

                Type toolType = _activeDocumentWorkspace.GetToolType();

                if (toolType != null)
                {
                    _globalToolTypeChoice = _activeDocumentWorkspace.GetToolType();
                }
            }

            ResumeUpdateSnapObstacle();
            UpdateSnapObstacle();
        }

        public event EventHandler ActiveDocumentWorkspaceChanged;
        protected virtual void OnActiveDocumentWorkspaceChanged()
        {
            SuspendUpdateSnapObstacle();

            if (_activeDocumentWorkspace == null)
            {
                ToolBar.CommonActionsStrip.SetButtonEnabled(CommonAction.Print, false);
                ToolBar.CommonActionsStrip.SetButtonEnabled(CommonAction.Save, false);
            }
            else
            {
                _activeDocumentWorkspace.SuspendLayout();

                ToolBar.CommonActionsStrip.SetButtonEnabled(CommonAction.Print, true);
                ToolBar.CommonActionsStrip.SetButtonEnabled(CommonAction.Save, true);

                _activeDocumentWorkspace.BackColor = SystemColors.ControlDark;
                _activeDocumentWorkspace.Dock = DockStyle.Fill;
                _activeDocumentWorkspace.DrawGrid = DrawGrid;
                _activeDocumentWorkspace.PanelAutoScroll = true;
                _activeDocumentWorkspace.RulersEnabled = _globalRulersChoice;
                _activeDocumentWorkspace.TabIndex = 0;
                _activeDocumentWorkspace.TabStop = false;
                _activeDocumentWorkspace.RulersEnabledChanged += DocumentWorkspaceRulersEnabledChanged;
                _activeDocumentWorkspace.DocumentMouseEnter += DocumentMouseEnterHandler;
                _activeDocumentWorkspace.DocumentMouseLeave += DocumentMouseLeaveHandler;
                _activeDocumentWorkspace.DocumentMouseMove += DocumentMouseMoveHandler;
                _activeDocumentWorkspace.DocumentMouseDown += DocumentMouseDownHandler;
                _activeDocumentWorkspace.Scroll += DocumentWorkspaceScroll;
                _activeDocumentWorkspace.DrawGridChanged += DocumentWorkspaceDrawGridChanged;
                _activeDocumentWorkspace.DocumentClick += DocumentClick;
                _activeDocumentWorkspace.DocumentMouseUp += DocumentMouseUpHandler;
                _activeDocumentWorkspace.DocumentKeyPress += DocumentKeyPress;
                _activeDocumentWorkspace.DocumentKeyUp += DocumenKeyUp;
                _activeDocumentWorkspace.DocumentKeyDown += DocumentKeyDown;

                if (_workspacePanel.Controls.Contains(_activeDocumentWorkspace))
                {
                    _activeDocumentWorkspace.Visible = true;
                }
                else
                {
                    _activeDocumentWorkspace.Dock = DockStyle.Fill;
                    _workspacePanel.Controls.Add(_activeDocumentWorkspace);
                }

                _activeDocumentWorkspace.Layout += DocumentWorkspaceLayout;
                ToolBar.ViewConfigStrip.ScaleFactor = _activeDocumentWorkspace.ScaleFactor;
                ToolBar.ViewConfigStrip.ZoomBasis = _activeDocumentWorkspace.ZoomBasis;

                _activeDocumentWorkspace.AppWorkspace = this;
                _activeDocumentWorkspace.History.Changed += HistoryChangedHandler;
                _activeDocumentWorkspace.StatusChanged += OnDocumentWorkspaceStatusChanged;
                _activeDocumentWorkspace.DocumentChanging += DocumentWorkspaceDocumentChanging;
                _activeDocumentWorkspace.DocumentChanged += DocumentWorkspaceDocumentChanged;
                _activeDocumentWorkspace.Selection.Changing += SelectedPathChangingHandler;
                _activeDocumentWorkspace.Selection.Changed += SelectedPathChangedHandler;
                _activeDocumentWorkspace.ScaleFactorChanged += ZoomChangedHandler;
                _activeDocumentWorkspace.ZoomBasisChanged += DocumentWorkspaceZoomBasisChanged;

                _activeDocumentWorkspace.Units = _widgets.ViewConfigStrip.Units;

                _historyForm.HistoryControl.HistoryStack = ActiveDocumentWorkspace.History;

                _activeDocumentWorkspace.ToolChanging += ToolChangingHandler;
                _activeDocumentWorkspace.ToolChanged += ToolChangedHandler;

                ToolBar.ViewConfigStrip.RulersEnabled = _activeDocumentWorkspace.RulersEnabled;
                ToolBar.DocumentStrip.SelectDocumentWorkspace(_activeDocumentWorkspace);

                _activeDocumentWorkspace.SetToolFromType(_globalToolTypeChoice);

                UpdateSelectionToolbarButtons();
                UpdateHistoryButtons();
                UpdateDocInfoInStatusBar();

                _activeDocumentWorkspace.ResumeLayout();
                _activeDocumentWorkspace.PerformLayout();

                _activeDocumentWorkspace.FirstInputAfterGotFocus +=
                    ActiveDocumentWorkspaceFirstInputAfterGotFocus;
            }

            if (ActiveDocumentWorkspaceChanged != null)
            {
                ActiveDocumentWorkspaceChanged(this, EventArgs.Empty);
            }

            UpdateStatusBarContextStatus();
            ResumeUpdateSnapObstacle();
            UpdateSnapObstacle();
        }

        public AppWorkspace()
        {
            SuspendLayout();

            // initialize!
            InitializeComponent();
            InitializeFloatingForms();

            _mainToolBarForm.ToolsControl.SetTools(DocumentWorkspace.ToolInfos);
            _mainToolBarForm.ToolsControl.ToolClicked += MainToolBarToolClicked;

            ToolBar.ToolChooserStrip.SetTools(DocumentWorkspace.ToolInfos);
            ToolBar.ToolChooserStrip.ToolClicked += MainToolBarToolClicked;

            ToolBar.AppWorkspace = this;

            // init the Widgets container
            _widgets = new WorkspaceWidgets(this)
                           {
                               ViewConfigStrip = ToolBar.ViewConfigStrip,
                               CommonActionsStrip = ToolBar.CommonActionsStrip,
                               ToolConfigStrip = ToolBar.ToolConfigStrip,
                               ToolsForm = _mainToolBarForm,
                               LayerForm = _layerForm,
                               HistoryForm = _historyForm,
                               ColorsForm = _colorsForm,
                               StatusBarProgress = _statusBar,
                               DocumentStrip = ToolBar.DocumentStrip
                           };

            // Load our settings and initialize the AppEnvironment
            LoadSettings();

            // hook into Environment *Changed events
            AppEnvironment.PrimaryColorChanged += PrimaryColorChangedHandler;
            AppEnvironment.SecondaryColorChanged += SecondaryColorChangedHandler;
            AppEnvironment.ShapeDrawTypeChanged += ShapeDrawTypeChangedHandler;
            AppEnvironment.GradientInfoChanged += GradientInfoChangedHandler;
            AppEnvironment.ToleranceChanged += OnEnvironmentToleranceChanged;
            AppEnvironment.AlphaBlendingChanged += AlphaBlendingChangedHandler;
            AppEnvironment.FontInfo = ToolBar.ToolConfigStrip.FontInfo;
            AppEnvironment.TextAlignment = ToolBar.ToolConfigStrip.FontAlignment;
            AppEnvironment.AntiAliasingChanged += EnvironmentAntiAliasingChanged;
            AppEnvironment.FontInfoChanged += EnvironmentFontInfoChanged;
            AppEnvironment.FontSmoothingChanged += EnvironmentFontSmoothingChanged;
            AppEnvironment.TextAlignmentChanged += EnvironmentTextAlignmentChanged;
            AppEnvironment.PenInfoChanged += EnvironmentPenInfoChanged;
            AppEnvironment.BrushInfoChanged += EnvironmentBrushInfoChanged;
            AppEnvironment.ColorPickerClickBehaviorChanged += EnvironmentColorPickerClickBehaviorChanged;
            AppEnvironment.ResamplingAlgorithmChanged += EnvironmentResamplingAlgorithmChanged;
            AppEnvironment.SelectionCombineModeChanged += EnvironmentSelectionCombineModeChanged;
            AppEnvironment.FloodModeChanged += EnvironmentFloodModeChanged;
            AppEnvironment.SelectionDrawModeInfoChanged += EnvironmentSelectionDrawModeInfoChanged;

            ToolBar.DocumentStrip.RelinquishFocus += RelinquishFocusHandler;

            ToolBar.ToolConfigStrip.ToleranceChanged += OnToolBarToleranceChanged;
            ToolBar.ToolConfigStrip.FontAlignmentChanged += ToolConfigStripTextAlignmentChanged;
            ToolBar.ToolConfigStrip.FontInfoChanged += ToolConfigStripFontTextChanged;
            ToolBar.ToolConfigStrip.FontSmoothingChanged += ToolConfigStripFontSmoothingChanged;
            ToolBar.ToolConfigStrip.RelinquishFocus += RelinquishFocusHandler2;

            ToolBar.CommonActionsStrip.RelinquishFocus += OnToolStripRelinquishFocus;
            ToolBar.CommonActionsStrip.MouseWheel += OnToolStripMouseWheel;
            ToolBar.CommonActionsStrip.ButtonClick += CommonActionsStripButtonClick;

            ToolBar.ViewConfigStrip.DrawGridChanged += ViewConfigStripDrawGridChanged;
            ToolBar.ViewConfigStrip.RulersEnabledChanged += ViewConfigStripRulersEnabledChanged;
            ToolBar.ViewConfigStrip.ZoomBasisChanged += ViewConfigStripZoomBasisChanged;
            ToolBar.ViewConfigStrip.ZoomScaleChanged += ViewConfigStripZoomScaleChanged;
            ToolBar.ViewConfigStrip.ZoomIn += ViewConfigStripZoomIn;
            ToolBar.ViewConfigStrip.ZoomOut += ViewConfigStripZoomOut;
            ToolBar.ViewConfigStrip.UnitsChanged += ViewConfigStripUnitsChanged;
            ToolBar.ViewConfigStrip.RelinquishFocus += OnToolStripRelinquishFocus;
            ToolBar.ViewConfigStrip.MouseWheel += OnToolStripMouseWheel;

            ToolBar.ToolConfigStrip.BrushInfoChanged += DrawConfigStripBrushChanged;
            ToolBar.ToolConfigStrip.ShapeDrawTypeChanged += DrawConfigStripShapeDrawTypeChanged;
            ToolBar.ToolConfigStrip.PenInfoChanged += DrawConfigStripPenChanged;
            ToolBar.ToolConfigStrip.GradientInfoChanged += ToolConfigStrip_GradientInfoChanged;
            ToolBar.ToolConfigStrip.AlphaBlendingChanged += OnDrawConfigStripAlphaBlendingChanged;
            ToolBar.ToolConfigStrip.AntiAliasingChanged += DrawConfigStripAntiAliasingChanged;
            ToolBar.ToolConfigStrip.RelinquishFocus += OnToolStripRelinquishFocus;
            ToolBar.ToolConfigStrip.ColorPickerClickBehaviorChanged += ToolConfigStripColorPickerClickBehaviorChanged;
            ToolBar.ToolConfigStrip.ResamplingAlgorithmChanged += ToolConfigStripResamplingAlgorithmChanged;
            ToolBar.ToolConfigStrip.SelectionCombineModeChanged += ToolConfigStripSelectionCombineModeChanged;
            ToolBar.ToolConfigStrip.FloodModeChanged += ToolConfigStripFloodModeChanged;
            ToolBar.ToolConfigStrip.SelectionDrawModeInfoChanged += ToolConfigStripSelectionDrawModeInfoChanged;
            ToolBar.ToolConfigStrip.SelectionDrawModeUnitsChanging += ToolConfigStripSelectionDrawModeUnitsChanging;

            ToolBar.ToolConfigStrip.MouseWheel += OnToolStripMouseWheel;

            ToolBar.DocumentStrip.RelinquishFocus += OnToolStripRelinquishFocus;
            ToolBar.DocumentStrip.DocumentClicked += DocumentStripDocumentTabClicked;
            ToolBar.DocumentStrip.DocumentListChanged += DocumentStripDocumentListChanged;

            // Synchronize
            AppEnvironment.PerformAllChanged();

            _globalToolTypeChoice = _defaultToolTypeChoice;
            ToolBar.ToolConfigStrip.ToolBarConfigItems = ToolBarConfigItems.None;

            _layerForm.LayerControl.AppWorkspace = this;

            ResumeLayout();
            PerformLayout();
        }

        private void ToolConfigStripColorPickerClickBehaviorChanged(object sender, EventArgs e)
        {
            AppEnvironment.ColorPickerClickBehavior = _widgets.ToolConfigStrip.ColorPickerClickBehavior;
        }

        private void EnvironmentColorPickerClickBehaviorChanged(object sender, EventArgs e)
        {
            _widgets.ToolConfigStrip.ColorPickerClickBehavior = AppEnvironment.ColorPickerClickBehavior;
        }

        private void ToolConfigStripResamplingAlgorithmChanged(object sender, EventArgs e)
        {
            AppEnvironment.ResamplingAlgorithm = _widgets.ToolConfigStrip.ResamplingAlgorithm;
        }

        private void EnvironmentResamplingAlgorithmChanged(object sender, EventArgs e)
        {
            _widgets.ToolConfigStrip.ResamplingAlgorithm = AppEnvironment.ResamplingAlgorithm;
        }

        private void ToolConfigStripSelectionCombineModeChanged(object sender, EventArgs e)
        {
            AppEnvironment.SelectionCombineMode = _widgets.ToolConfigStrip.SelectionCombineMode;
        }

        private void EnvironmentSelectionCombineModeChanged(object sender, EventArgs e)
        {
            _widgets.ToolConfigStrip.SelectionCombineMode = AppEnvironment.SelectionCombineMode;
        }

        private void ToolConfigStripFloodModeChanged(object sender, EventArgs e)
        {
            AppEnvironment.FloodMode = _widgets.ToolConfigStrip.FloodMode;
        }

        private void EnvironmentFloodModeChanged(object sender, EventArgs e)
        {
            _widgets.ToolConfigStrip.FloodMode = AppEnvironment.FloodMode;
        }

        private void ToolConfigStripSelectionDrawModeInfoChanged(object sender, EventArgs e)
        {
            AppEnvironment.SelectionDrawModeInfo = _widgets.ToolConfigStrip.SelectionDrawModeInfo;
        }

        private void EnvironmentSelectionDrawModeInfoChanged(object sender, EventArgs e)
        {
            _widgets.ToolConfigStrip.SelectionDrawModeInfo = AppEnvironment.SelectionDrawModeInfo;
        }

        private sealed class ToolConfigStripSelectionDrawModeUnitsChangeHandler
        {
            private readonly ToolConfigStrip _toolConfigStrip;
            private readonly Document _activeDocument;
            private readonly MeasurementUnit _oldUnits;

            public ToolConfigStripSelectionDrawModeUnitsChangeHandler(ToolConfigStrip toolConfigStrip, Document activeDocument)
            {
                _toolConfigStrip = toolConfigStrip;
                _activeDocument = activeDocument;
                _oldUnits = toolConfigStrip.SelectionDrawModeInfo.Units;
            }

            public void Initialize()
            {
                _toolConfigStrip.SelectionDrawModeUnitsChanged += ToolConfigStripSelectionDrawModeUnitsChanged;
            }

            private void ToolConfigStripSelectionDrawModeUnitsChanged(object sender, EventArgs e)
            {
                try
                {
                    SelectionDrawModeInfo sdmi = _toolConfigStrip.SelectionDrawModeInfo;
                    MeasurementUnit newUnits = sdmi.Units;

                    double oldWidth = sdmi.Width;
                    double oldHeight = sdmi.Height;

                    double newWidth = Document.ConvertMeasurement(oldWidth, _oldUnits, _activeDocument.DpuUnit, _activeDocument.DpuX, newUnits);
                    double newHeight = Document.ConvertMeasurement(oldHeight, _oldUnits, _activeDocument.DpuUnit, _activeDocument.DpuY, newUnits);

                    SelectionDrawModeInfo newSdmi = sdmi.CloneWithNewWidthAndHeight(newWidth, newHeight);
                    _toolConfigStrip.SelectionDrawModeInfo = newSdmi;
                }

                finally
                {
                    _toolConfigStrip.SelectionDrawModeUnitsChanged -= ToolConfigStripSelectionDrawModeUnitsChanged;
                }
            }
        }

        private void ToolConfigStripSelectionDrawModeUnitsChanging(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace == null || ActiveDocumentWorkspace.Document == null) return;
            var tcsSdmuch = new ToolConfigStripSelectionDrawModeUnitsChangeHandler(
                ToolBar.ToolConfigStrip, ActiveDocumentWorkspace.Document);

            tcsSdmuch.Initialize();
        }

        private void DocumentStripDocumentListChanged(object sender, EventArgs e)
        {
            bool enableThem = (_widgets.DocumentStrip.DocumentCount != 0);

            _widgets.ToolsForm.Enabled = enableThem;
            _widgets.HistoryForm.Enabled = enableThem;
            _widgets.LayerForm.Enabled = enableThem;
            _widgets.ColorsForm.Enabled = enableThem;
            _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.Paste, enableThem);

            UpdateHistoryButtons();
            UpdateDocInfoInStatusBar();
            UpdateCursorInfoInStatusBar(0, 0);
        }

        public void SaveSettings()
        {
            Settings.CurrentUser.SetBoolean(SettingNames.Rulers, _globalRulersChoice);
            Settings.CurrentUser.SetBoolean(SettingNames.DrawGrid, DrawGrid);
            Settings.CurrentUser.SetString(SettingNames.DefaultToolTypeName, _defaultToolTypeChoice.Name);
            MostRecentFiles.SaveMruList();
        }

        private void LoadDefaultToolType()
        {
            string defaultToolTypeName = Settings.CurrentUser.GetString(SettingNames.DefaultToolTypeName, Tool.DefaultToolType.Name);

            ToolInfo[] tis = DocumentWorkspace.ToolInfos;
            ToolInfo ti = Array.Find(
                tis,
                check =>
                string.Compare(defaultToolTypeName, check.ToolType.Name, StringComparison.InvariantCultureIgnoreCase) ==
                0);

            _defaultToolTypeChoice = ti == null ? Tool.DefaultToolType : ti.ToolType;
        }

        public void LoadSettings()
        {
            try
            {
                LoadDefaultToolType();

                _globalToolTypeChoice = _defaultToolTypeChoice;
                _globalRulersChoice = Settings.CurrentUser.GetBoolean(SettingNames.Rulers, false);
                DrawGrid = Settings.CurrentUser.GetBoolean(SettingNames.DrawGrid, false);

                AppEnvironment = AppEnvironment.GetDefaultAppEnvironment();

                _widgets.ViewConfigStrip.Units = (MeasurementUnit)Enum.Parse(typeof(MeasurementUnit),
                    Settings.CurrentUser.GetString(SettingNames.Units, MeasurementUnit.Pixel.ToString()), true);
            }

            catch (Exception)
            {
                AppEnvironment = new AppEnvironment();
                AppEnvironment.SetToDefaults();

                try
                {
                    Settings.CurrentUser.Delete(
                        new[] 
                        {    
                            SettingNames.Rulers, 
                            SettingNames.DrawGrid, 
                            SettingNames.Units,
                            SettingNames.DefaultAppEnvironment,
                            SettingNames.DefaultToolTypeName,
                        });
                }

                catch (Exception)
                {
                }
            }

            try
            {
                ToolBar.ToolConfigStrip.LoadFromAppEnvironment(AppEnvironment);
            }

            catch (Exception)
            {
                AppEnvironment = new AppEnvironment();
                AppEnvironment.SetToDefaults();
                ToolBar.ToolConfigStrip.LoadFromAppEnvironment(AppEnvironment);
            }
        }

        protected override void OnLoad(EventArgs e)
        {
            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.Select();
            }

            UpdateSnapObstacle();

            base.OnLoad(e);
        }

        public void RefreshTool()
        {
            Type toolType = _activeDocumentWorkspace.GetToolType();
            Widgets.ToolsControl.SelectTool(toolType);
        }

        private void GradientInfoChangedHandler(object sender, EventArgs e)
        {
            if (_widgets.ToolConfigStrip.GradientInfo != AppEnvironment.GradientInfo)
            {
                _widgets.ToolConfigStrip.GradientInfo = AppEnvironment.GradientInfo;
            }
        }

        private void ToolConfigStrip_GradientInfoChanged(object sender, EventArgs e)
        {
            if (AppEnvironment.GradientInfo != _widgets.ToolConfigStrip.GradientInfo)
            {
                AppEnvironment.GradientInfo = _widgets.ToolConfigStrip.GradientInfo;
            }
        }

        /// <summary>
        /// Keeps the Environment's ShapeDrawType and the corresponding widget synchronized
        /// </summary>
        private void ShapeDrawTypeChangedHandler(object sender, EventArgs e)
        {
            if (_widgets.ToolConfigStrip.ShapeDrawType != AppEnvironment.ShapeDrawType)
            {
                _widgets.ToolConfigStrip.ShapeDrawType = AppEnvironment.ShapeDrawType;
            }
        }

        /// <summary>
        /// Keeps the Environment's alpha blending value and the corresponding widget synchronized
        /// </summary>
        private void AlphaBlendingChangedHandler(object sender, EventArgs e)
        {
            if (_widgets.ToolConfigStrip.AlphaBlending != AppEnvironment.AlphaBlending)
            {
                _widgets.ToolConfigStrip.AlphaBlending = AppEnvironment.AlphaBlending;
            }
        }

        private void ColorDisplay_UserPrimaryAndSecondaryColorsChanged(object sender, EventArgs e)
        {
            // We need to make sure that we don't change which user color is selected (primary vs. secondary)
            // To do this we choose the ordering based on which one is currently active (primary vs. secondary)
            if (_widgets.ColorsForm.WhichUserColor == WhichUserColor.Primary)
            {
                _widgets.ColorsForm.SetColorControlsRedraw(false);
                SecondaryColorChangedHandler(sender, e);
                PrimaryColorChangedHandler(sender, e);
                _widgets.ColorsForm.SetColorControlsRedraw(true);
                _widgets.ColorsForm.WhichUserColor = WhichUserColor.Primary;
            }
            else //if (widgets.ColorsForm.WhichUserColor == WhichUserColor.Background)
            {
                _widgets.ColorsForm.SetColorControlsRedraw(false);
                PrimaryColorChangedHandler(sender, e);
                SecondaryColorChangedHandler(sender, e);
                _widgets.ColorsForm.SetColorControlsRedraw(true);
                _widgets.ColorsForm.WhichUserColor = WhichUserColor.Secondary;
            }
        }
 
        private void PrimaryColorChangedHandler(object sender, EventArgs e)
        {
            if (sender == AppEnvironment)
            {
                _widgets.ColorsForm.UserPrimaryColor = AppEnvironment.PrimaryColor;
            }
        }

        private void OnToolBarToleranceChanged(object sender, EventArgs e)
        {
            AppEnvironment.Tolerance = _widgets.ToolConfigStrip.Tolerance;
            Focus();
        }

        private void OnEnvironmentToleranceChanged(object sender, EventArgs e)
        {
            _widgets.ToolConfigStrip.Tolerance = AppEnvironment.Tolerance;
            Focus();
        }

        private void SecondaryColorChangedHandler(object sender, EventArgs e)
        {
            if (sender == AppEnvironment)
            {
                _widgets.ColorsForm.UserSecondaryColor = AppEnvironment.SecondaryColor;
            }
        }

        private void RelinquishFocusHandler(object sender, EventArgs e)
        {
            Focus();
        }

        private void RelinquishFocusHandler2(object sender, EventArgs e)
        {
            if (_activeDocumentWorkspace != null)
            {
                _activeDocumentWorkspace.Focus();
            }
        }

        private void ColorsFormUserPrimaryColorChanged(object sender, ColorEventArgs e)
        {
            var cf = (ColorsForm)sender;
            AppEnvironment.PrimaryColor = e.Color;
        }

        private void ColorsFormUserSecondaryColorChanged(object sender, ColorEventArgs e)
        {
            var cf = (ColorsForm)sender;
            AppEnvironment.SecondaryColor = e.Color;
        }

        /// <summary>
        /// Handles the SelectedPathChanging event that is raised by the AppEnvironment.
        /// </summary>
        private static void SelectedPathChangingHandler(object sender, EventArgs e)
        {   
        }

        private void UpdateSelectionToolbarButtons()
        {
            if (ActiveDocumentWorkspace == null || ActiveDocumentWorkspace.Selection.IsEmpty)
            {
                _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.Cut, false);
                _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.Copy, false);
                _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.Deselect, false);
                _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.CropToSelection, false);
            }
            else
            {
                _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.Cut, true);
                _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.Copy, true);
                _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.Deselect, true);
                _widgets.CommonActionsStrip.SetButtonEnabled(CommonAction.CropToSelection, true);
            }
        }

        /// <summary>
        /// Handles the SelectedPathChanged event that is raised by the AppEnvironment.
        /// </summary>
        private void SelectedPathChangedHandler(object sender, EventArgs e)
        {
            UpdateSelectionToolbarButtons();
        }

        private void ZoomChangedHandler(object sender, EventArgs e)
        {
            ScaleFactor sf = _activeDocumentWorkspace.ScaleFactor;
            ToolBar.ViewConfigStrip.SuspendEvents();
            ToolBar.ViewConfigStrip.ZoomBasis = _activeDocumentWorkspace.ZoomBasis;
            ToolBar.ViewConfigStrip.ScaleFactor = sf;
            ToolBar.ViewConfigStrip.ResumeEvents();
        }

        private void InitializeComponent()
        {
            ToolBar = new PdnToolBar();
            _statusBar = new PdnStatusBar();
            _workspacePanel = new Panel();
            _workspacePanel.SuspendLayout();
            _statusBar.SuspendLayout();
            SuspendLayout();
            //
            // toolBar
            //
            ToolBar.Name = "ToolBar";
            ToolBar.Dock = DockStyle.Top;
            //
            // statusBar
            //
            _statusBar.Name = "_statusBar";
            //
            // workspacePanel
            //
            _workspacePanel.Name = "_workspacePanel";
            _workspacePanel.Dock = DockStyle.Fill;
            // 
            // AppWorkspace
            // 
            Controls.Add(_workspacePanel);
            Controls.Add(_statusBar);
            Controls.Add(ToolBar);
            Name = "AppWorkspace";
            Size = new Size(872, 640);
            _workspacePanel.ResumeLayout(false);
            _statusBar.ResumeLayout(false);
            _statusBar.PerformLayout();
            ResumeLayout(false);
        }

        private void DocumentStripDocumentTabClicked(
            object sender, 
            EventArgs<Pair<DocumentWorkspace, DocumentClickAction>> e)
        {
            switch (e.Data.Second)
            {
                case DocumentClickAction.Select:
                    ActiveDocumentWorkspace = e.Data.First;
                    break;

                case DocumentClickAction.Close:
                    var cwa = new CloseWorkspaceAction(e.Data.First);
                    PerformAction(cwa);
                    break;

                default:
                    throw new NotImplementedException("Code for DocumentClickAction." + e.Data.Second + " not implemented");
            }

            Update();
        }

        private void OnToolStripMouseWheel(object sender, MouseEventArgs e)
        {
            if (_activeDocumentWorkspace != null)
            {
                _activeDocumentWorkspace.PerformMouseWheel((Control)sender, e);
            }
        }

        private void OnToolStripRelinquishFocus(object sender, EventArgs e)
        {
            if (_activeDocumentWorkspace != null)
            {
                _activeDocumentWorkspace.Focus();
            }
        }

        // The Document* events are raised by the Document class, handled here,
        // and relayed as necessary. For instance, for the DocumentMouse* events, 
        // these are all relayed to the active tool.

        private void DocumentMouseEnterHandler(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace.Tool != null)
            {
                ActiveDocumentWorkspace.Tool.PerformMouseEnter();
            }
        }

        private void DocumentMouseLeaveHandler(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace.Tool != null)
            {
                ActiveDocumentWorkspace.Tool.PerformMouseLeave();
            }
        }

        private void DocumentMouseUpHandler(object sender, MouseEventArgs e)
        {
            if (ActiveDocumentWorkspace.Tool != null)
            {
                ActiveDocumentWorkspace.Tool.PerformMouseUp(e);
            }
        }

        private void DocumentMouseDownHandler(object sender, MouseEventArgs e)
        {
            if (ActiveDocumentWorkspace.Tool != null)
            {
                ActiveDocumentWorkspace.Tool.PerformMouseDown(e);
            }
        }

        private void DocumentMouseMoveHandler(object sender, MouseEventArgs e)
        {
            if (ActiveDocumentWorkspace.Tool != null)
            {
                ActiveDocumentWorkspace.Tool.PerformMouseMove(e);
            }

            UpdateCursorInfoInStatusBar(e.X, e.Y);
        }

        private void DocumentClick(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace.Tool != null)
            {
                ActiveDocumentWorkspace.Tool.PerformClick();
            }
        }

        private void DocumentKeyPress(object sender, KeyPressEventArgs e)
        {
            if (ActiveDocumentWorkspace.Tool != null)
            {
                ActiveDocumentWorkspace.Tool.PerformKeyPress(e);
            }
        }

        private void DocumentKeyDown(object sender, KeyEventArgs e)
        {
            if (ActiveDocumentWorkspace.Tool != null)
            {
                ActiveDocumentWorkspace.Tool.PerformKeyDown(e);
            }
        }

        private void DocumenKeyUp(object sender, KeyEventArgs e)
        {
            if (ActiveDocumentWorkspace.Tool != null)
            {
                ActiveDocumentWorkspace.Tool.PerformKeyUp(e);
            }
        }

        private void InitializeFloatingForms()
        {
            // MainToolBarForm
            _mainToolBarForm = new ToolsForm();
            _mainToolBarForm.RelinquishFocus += RelinquishFocusHandler;
            _mainToolBarForm.ProcessCmdKeyEvent += OnToolFormProcessCmdKeyEvent;

            // LayerForm
            _layerForm = new LayerForm {LayerControl = {AppWorkspace = this}};
            _layerForm.LayerControl.ClickedOnLayer += LayerControlClickedOnLayer;
            _layerForm.NewLayerButtonClick += LayerFormNewLayerButtonClicked;
            _layerForm.DeleteLayerButtonClick += LayerFormDeleteLayerButtonClicked;
            _layerForm.DuplicateLayerButtonClick += LayerFormDuplicateLayerButtonClick;
            _layerForm.MergeLayerDownClick += LayerFormMergeLayerDownClick;
            _layerForm.MoveLayerUpButtonClick += LayerFormMoveLayerUpButtonClicked;
            _layerForm.MoveLayerDownButtonClick += LayerFormMoveLayerDownButtonClicked;
            _layerForm.PropertiesButtonClick += LayerFormPropertiesButtonClick;
            _layerForm.RelinquishFocus += RelinquishFocusHandler;
            _layerForm.ProcessCmdKeyEvent += OnToolFormProcessCmdKeyEvent;
            
            // HistoryForm
            _historyForm = new HistoryForm();
            _historyForm.RewindButtonClicked += HistoryFormRewindButtonClicked;
            _historyForm.UndoButtonClicked += HistoryFormUndoButtonClicked;
            _historyForm.RedoButtonClicked += HistoryFormRedoButtonClicked;
            _historyForm.FastForwardButtonClicked += HistoryFormFastForwardButtonClicked;
            _historyForm.RelinquishFocus += RelinquishFocusHandler;
            _historyForm.ProcessCmdKeyEvent += OnToolFormProcessCmdKeyEvent;

            // ColorsForm
            _colorsForm = new ColorsForm
                              {
                                  PaletteCollection = new PaletteCollection(),
                                  WhichUserColor = WhichUserColor.Primary
                              };
            _colorsForm.UserPrimaryColorChanged += ColorsFormUserPrimaryColorChanged;
            _colorsForm.UserSecondaryColorChanged += ColorsFormUserSecondaryColorChanged;
            _colorsForm.RelinquishFocus += RelinquishFocusHandler;
            _colorsForm.ProcessCmdKeyEvent += OnToolFormProcessCmdKeyEvent;
        }

        // TODO: put at correct scope
        public event CmdKeysEventHandler ProcessCmdKeyEvent;

        private bool OnToolFormProcessCmdKeyEvent(object sender, ref Message msg, Keys keyData)
        {
            return ProcessCmdKeyEvent != null && ProcessCmdKeyEvent(sender, ref msg, keyData);
        }

        public void PerformActionAsync(AppWorkspaceAction performMe)
        {
            BeginInvoke(new Procedure<AppWorkspaceAction>(PerformAction), new object[] { performMe });
        }

        public void PerformAction(AppWorkspaceAction performMe)
        {
            Update();

            using (new WaitCursorChanger(this))
            {
                performMe.PerformAction(this);
            }

            Update();
        }

        private void MainToolBarToolClicked(object sender, ToolClickedEventArgs e)
        {
            if (ActiveDocumentWorkspace == null) return;
            ActiveDocumentWorkspace.Focus();
            ActiveDocumentWorkspace.SetToolFromType(e.ToolType);
        }

        private void ToolChangingHandler(object sender, EventArgs e)
        {
            UI.SuspendControlPainting(ToolBar);

            if (ActiveDocumentWorkspace.Tool != null)
            {
                // unregister for events here (none at this time)
            }
        }

        private void ToolChangedHandler(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace.Tool != null)
            {
                _widgets.ToolsControl.SelectTool(ActiveDocumentWorkspace.GetToolType(), false);
                ToolBar.ToolChooserStrip.SelectTool(ActiveDocumentWorkspace.GetToolType(), false);
                ToolBar.ToolConfigStrip.Visible = true; // HACK: see bug #2702
                ToolBar.ToolConfigStrip.ToolBarConfigItems = ActiveDocumentWorkspace.Tool.ToolBarConfigItems;
                _globalToolTypeChoice = ActiveDocumentWorkspace.GetToolType();
            }

            UpdateStatusBarContextStatus();

            UI.ResumeControlPainting(ToolBar);
            ToolBar.Refresh();
        }

        private void DrawConfigStripAntiAliasingChanged(object sender, EventArgs e)
        {
            AppEnvironment.AntiAliasing = ((ToolConfigStrip)sender).AntiAliasing;
        }

        private void DrawConfigStripPenChanged(object sender, EventArgs e)
        {
            AppEnvironment.PenInfo = ToolBar.ToolConfigStrip.PenInfo;
        }

        private void DrawConfigStripBrushChanged(object sender, EventArgs e)
        {
            AppEnvironment.BrushInfo = ToolBar.ToolConfigStrip.BrushInfo;
        }

        private void LayerControlClickedOnLayer(object sender, EventArgs<Layer> ce)
        {
            if (ActiveDocumentWorkspace != null)
            {
                if (ce.Data != ActiveDocumentWorkspace.ActiveLayer)
                {
                    ActiveDocumentWorkspace.ActiveLayer = ce.Data;
                }
            }

            RelinquishFocusHandler(sender, EventArgs.Empty);
        }

        private void LayerFormNewLayerButtonClicked(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.ExecuteFunction(new AddNewBlankLayerFunction());
            }
        }

        private void LayerFormDeleteLayerButtonClicked(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null && ActiveDocumentWorkspace.Document.Layers.Count > 1)
            {
                ActiveDocumentWorkspace.ExecuteFunction(new DeleteLayerFunction(ActiveDocumentWorkspace.ActiveLayerIndex));
            }
        }

        private void LayerFormMergeLayerDownClick(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace == null) return;
            if (ActiveDocumentWorkspace.ActiveLayerIndex <= 0) return;
            // TODO: keep this in sync with LayersMenu. not appropriate to refactor into an Action for a 'dot' release
            int newLayerIndex = Utility.Clamp(
                ActiveDocumentWorkspace.ActiveLayerIndex - 1,
                0,
                ActiveDocumentWorkspace.Document.Layers.Count - 1);

            ActiveDocumentWorkspace.ExecuteFunction(
                new MergeLayerDownFunction(ActiveDocumentWorkspace.ActiveLayerIndex));

            ActiveDocumentWorkspace.ActiveLayerIndex = newLayerIndex;
        }

        private void LayerFormDuplicateLayerButtonClick(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.ExecuteFunction(new DuplicateLayerFunction(ActiveDocumentWorkspace.ActiveLayerIndex));
            }
        }

        private void LayerFormMoveLayerUpButtonClicked(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null && ActiveDocumentWorkspace.Document.Layers.Count >= 2)
            {
                ActiveDocumentWorkspace.PerformAction(new MoveActiveLayerUpAction());
            }
        }
        
        private void LayerFormMoveLayerDownButtonClicked(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null && ActiveDocumentWorkspace.Document.Layers.Count >= 2)
            {
                ActiveDocumentWorkspace.PerformAction(new MoveActiveLayerDownAction());
            }
        }

        private void DrawConfigStripShapeDrawTypeChanged(object sender, EventArgs e)
        {
            if (AppEnvironment.ShapeDrawType != _widgets.ToolConfigStrip.ShapeDrawType)
            {
                AppEnvironment.ShapeDrawType = _widgets.ToolConfigStrip.ShapeDrawType;
            }
        }

        private void HistoryFormUndoButtonClicked(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.PerformAction(new HistoryUndoAction());
            }
        }

        private void HistoryFormRedoButtonClicked(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.PerformAction(new HistoryRedoAction());
            }
        }
        
        private void ViewConfigStripRulersEnabledChanged(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.RulersEnabled = ToolBar.ViewConfigStrip.RulersEnabled;
            }
        }

        private void HistoryFormRewindButtonClicked(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.PerformAction(new HistoryRewindAction());
            }
        }
        
        private void HistoryFormFastForwardButtonClicked(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.PerformAction(new HistoryFastForwardAction());
            }
        }

        private void LayerFormPropertiesButtonClick(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.PerformAction(new OpenActiveLayerPropertiesAction());
            }
        }

        private void EnvironmentFontInfoChanged(object sender, EventArgs e)
        {
            _widgets.ToolConfigStrip.FontInfo = AppEnvironment.FontInfo;
        }

        private void EnvironmentFontSmoothingChanged(object sender, EventArgs e)
        {
            _widgets.ToolConfigStrip.FontSmoothing = AppEnvironment.FontSmoothing;
        }

        private void EnvironmentTextAlignmentChanged(object sender, EventArgs e)
        {
            _widgets.ToolConfigStrip.FontAlignment = AppEnvironment.TextAlignment;
        }

        private void EnvironmentPenInfoChanged(object sender, EventArgs e)
        {
            _widgets.ToolConfigStrip.PenInfo = AppEnvironment.PenInfo;
        }

        private static void EnvironmentBrushInfoChanged(object sender, EventArgs e)
        {
        }

        private void ToolConfigStripTextAlignmentChanged(object sender, EventArgs e)
        {
            AppEnvironment.TextAlignment = _widgets.ToolConfigStrip.FontAlignment;
        }

        private void ToolConfigStripFontTextChanged(object sender, EventArgs e)
        {
            AppEnvironment.FontInfo = _widgets.ToolConfigStrip.FontInfo;
        }

        private void ToolConfigStripFontSmoothingChanged(object sender, EventArgs e)
        {
            AppEnvironment.FontSmoothing = _widgets.ToolConfigStrip.FontSmoothing;
        }

        protected override void OnResize(EventArgs e)
        {
            UpdateSnapObstacle();

            base.OnResize(e);

            if (ParentForm != null && ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.EnableToolPulse = ParentForm.WindowState != FormWindowState.Minimized;
            }
        }

        private void DocumentWorkspaceScroll(object sender, ScrollEventArgs e)
        {
            OnScroll(e);
        }

        private void DocumentWorkspaceLayout(object sender, LayoutEventArgs e)
        {
            UpdateSnapObstacle();
        }

        private void ViewConfigStripZoomBasisChanged(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace == null) return;
            if (ActiveDocumentWorkspace.ZoomBasis != ToolBar.ViewConfigStrip.ZoomBasis)
            {
                ActiveDocumentWorkspace.ZoomBasis = ToolBar.ViewConfigStrip.ZoomBasis;
            }
        }

        private void DocumentWorkspaceZoomBasisChanged(object sender, EventArgs e)
        {
            if (ToolBar.ViewConfigStrip.ZoomBasis != ActiveDocumentWorkspace.ZoomBasis)
            {
                ToolBar.ViewConfigStrip.ZoomBasis = ActiveDocumentWorkspace.ZoomBasis;
            }
        }

        private void ViewConfigStripZoomScaleChanged(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace == null) return;
            if (ToolBar.ViewConfigStrip.ZoomBasis == ZoomBasis.ScaleFactor)
            {
                _activeDocumentWorkspace.ScaleFactor = ToolBar.ViewConfigStrip.ScaleFactor;
            }
        }

        private void DocumentWorkspaceRulersEnabledChanged(object sender, EventArgs e)
        {
            ToolBar.ViewConfigStrip.RulersEnabled = _activeDocumentWorkspace.RulersEnabled;
            _globalRulersChoice = _activeDocumentWorkspace.RulersEnabled;
            PerformLayout();
            ActiveDocumentWorkspace.UpdateRulerSelectionTinting();

            Settings.CurrentUser.SetBoolean(SettingNames.Rulers, _activeDocumentWorkspace.RulersEnabled);
        }

        private void EnvironmentAntiAliasingChanged(object sender, EventArgs e)
        {
            ToolBar.ToolConfigStrip.AntiAliasing = AppEnvironment.AntiAliasing;
        }

        private void ViewConfigStripZoomIn(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.ZoomIn();
            }
        }

        private void ViewConfigStripZoomOut(object sender, EventArgs e)
        {
            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.ZoomOut();
            }
        }

        private void ViewConfigStripUnitsChanged(object sender, EventArgs e)
        {
            if (ToolBar.ViewConfigStrip.Units != MeasurementUnit.Pixel)
            {
                Settings.CurrentUser.SetString(SettingNames.LastNonPixelUnits, ToolBar.ViewConfigStrip.Units.ToString());
            }

            if (_activeDocumentWorkspace != null)
            {
                _activeDocumentWorkspace.Units = Units;
            }

            Settings.CurrentUser.SetString(SettingNames.Units, ToolBar.ViewConfigStrip.Units.ToString());

            UpdateDocInfoInStatusBar();
            _statusBar.CursorInfoText = string.Empty;

            OnUnitsChanged();
        }

        private void OnDrawConfigStripAlphaBlendingChanged(object sender, EventArgs e)
        {
            if (AppEnvironment.AlphaBlending != _widgets.ToolConfigStrip.AlphaBlending)
            {
                AppEnvironment.AlphaBlending = _widgets.ToolConfigStrip.AlphaBlending;
            }
        }

        public event EventHandler StatusChanged;
        private void OnStatusChanged()
        {
            if (StatusChanged != null)
            {
                StatusChanged(this, EventArgs.Empty);
            }
        }

        private void OnDocumentWorkspaceStatusChanged(object sender, EventArgs e)
        {
            OnStatusChanged();
            UpdateStatusBarContextStatus();
        }

        private void UpdateStatusBarContextStatus()
        {
            if (ActiveDocumentWorkspace != null)
            {
                _statusBar.ContextStatusText = _activeDocumentWorkspace.StatusText;
                _statusBar.ContextStatusImage = _activeDocumentWorkspace.StatusIcon;
            }
            else
            {
                _statusBar.ContextStatusText = string.Empty;
                _statusBar.ContextStatusImage = null;
            }
        }

/*
        private static bool NullGetThumbnailImageAbort()
        {
            return false;
        }                   //POTENTIAL UNUSED METHOD
*/
        
        /// <summary>
        /// Creates a blank document of the given size in a new workspace, and activates that workspace.
        /// </summary>
        /// <remarks>
        /// If isInitial=true, then last workspace added by this method is kept track of, and if it is not modified by
        /// the time the next workspace is added, then it will be removed.
        /// </remarks>
        /// <returns>true if everything was successful, false if there wasn't enough memory</returns>
        public bool CreateBlankDocumentInNewWorkspace(Size size, MeasurementUnit dpuUnit, double dpu, bool isInitial)
        {
            DocumentWorkspace dw1 = _activeDocumentWorkspace;
            if (dw1 != null)
            {
                dw1.SuspendRefresh();
            }

            try
            {
                var untitled = new Document(size.Width, size.Height) {DpuUnit = dpuUnit, DpuX = dpu, DpuY = dpu};

                BitmapLayer bitmapLayer;

                try
                {
                    using (new WaitCursorChanger(this))
                    {
                        bitmapLayer = Layer.CreateBackgroundLayer(size.Width, size.Height);
                    }
                }

                catch (OutOfMemoryException)
                {
                    Utility.ErrorBox(this, PdnResources.GetString("NewImageAction.Error.OutOfMemory"));
                    return false;
                }

                using (new WaitCursorChanger(this))
                {
                    bool focused = false;

                    if (ActiveDocumentWorkspace != null && ActiveDocumentWorkspace.Focused)
                    {
                        focused = true;
                    }

                    untitled.Layers.Add(bitmapLayer);

                    DocumentWorkspace dw = AddNewDocumentWorkspace();
                    Widgets.DocumentStrip.LockDocumentWorkspaceDirtyValue(dw, false);
                    dw.SuspendRefresh();

                    try
                    {
                        dw.Document = untitled;
                    }

                    catch (OutOfMemoryException)
                    {
                        Utility.ErrorBox(this, PdnResources.GetString("NewImageAction.Error.OutOfMemory"));
                        RemoveDocumentWorkspace(dw);
                        untitled.Dispose();
                        return false;
                    }

                    dw.ActiveLayer = (Layer)dw.Document.Layers[0];

                    ActiveDocumentWorkspace = dw;

                    dw.SetDocumentSaveOptions(null, null, null);
                    dw.History.ClearAll();
                    dw.History.PushNewMemento(
                        new NullHistoryMemento(PdnResources.GetString("NewImageAction.Name"), 
                        FileNewIcon));

                    dw.Document.Dirty = false;
                    dw.ResumeRefresh();

                    if (isInitial)
                    {
                        _initialWorkspace = dw;
                    }

                    if (focused)
                    {
                        ActiveDocumentWorkspace.Focus();
                    }

                    Widgets.DocumentStrip.UnlockDocumentWorkspaceDirtyValue(dw);
                }
            }

            finally
            {
                if (dw1 != null)
                {
                    dw1.ResumeRefresh();
                }
            }

            return true;
        }

        public bool OpenFilesInNewWorkspace(string[] fileNames)
        {
            if (IsDisposed)
            {
                return false;
            }

            bool result = true;

            foreach (string fileName in fileNames)
            {
                result &= OpenFileInNewWorkspace(fileName);

                if (!result)
                {
                    break;
                }
            }

            return result;
        }

        public bool OpenFileInNewWorkspace(string fileName)
        {
            return OpenFileInNewWorkspace(fileName, true);
        }

        public bool OpenFileInNewWorkspace(string fileName, bool addToMruList)
        {
            if (fileName == null)
            {
                throw new ArgumentNullException("fileName");
            }

            if (fileName.Length == 0)
            {
                throw new ArgumentOutOfRangeException("fileName.Length == 0");
            }

            PdnBaseForm.UpdateAllForms();

            FileType fileType;

            _widgets.StatusBarProgress.ResetProgressStatusBar();

            ProgressEventHandler progressCallback =
                (sender, e) => _widgets.StatusBarProgress.SetProgressStatusBar(e.Percent);

            Document document = DocumentWorkspace.LoadDocument(this, fileName, out fileType, progressCallback);
            _widgets.StatusBarProgress.EraseProgressStatusBar();

            if (document == null)
            {
                Cursor = Cursors.Default;
            }
            else
            {
                using (new WaitCursorChanger(this))
                {
                    DocumentWorkspace dw = AddNewDocumentWorkspace();
                    Widgets.DocumentStrip.LockDocumentWorkspaceDirtyValue(dw, false);

                    try
                    {
                        dw.Document = document;
                    }

                    catch (OutOfMemoryException)
                    {
                        Utility.ErrorBox(this, PdnResources.GetString("LoadImage.Error.OutOfMemoryException"));
                        RemoveDocumentWorkspace(dw);
                        document.Dispose();
                        return false;
                    } 

                    dw.ActiveLayer = (Layer)document.Layers[0];

                    dw.SetDocumentSaveOptions(fileName, fileType, null);

                    ActiveDocumentWorkspace = dw;

                    dw.History.ClearAll();

                    dw.History.PushNewMemento(
                        new NullHistoryMemento(
                            PdnResources.GetString("OpenImageAction.Name"),
                            ImageFromDiskIcon));

                    document.Dirty = false;
                    Widgets.DocumentStrip.UnlockDocumentWorkspaceDirtyValue(dw);
                }

                {
                    ActiveDocumentWorkspace.ZoomBasis = ZoomBasis.FitToWindow;
                }

                // add to MRU list
                if (addToMruList)
                {
                    ActiveDocumentWorkspace.AddToMruList();
                }

                ToolBar.DocumentStrip.SyncThumbnails();

                WarnAboutSavedWithVersion(document.SavedWithVersion);
            }

            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.Focus();
            }

            return document != null;
        }

        private static void WarnAboutSavedWithVersion(Version savedWith)
        {
            // warn about version?
            // 2.1 Build 1897 signifies when the file format changed and broke backwards compatibility (for saving)
            // 2.1 Build 1921 signifies when MemoryBlock was upgraded to support 64-bits, which broke it again
            // 2.1 Build 1924 upgraded to "unimportant ordering" for MemoryBlock serialization so we can to faster multiproc saves
            //                (in v2.5 we always save in order, although that doesn't change the file format's laxness)
            // 2.5 Build 2105 changed the way PropertyItems are serialized
            // 2.6 Build      upgrade to .NET 2.0, does not appear to be compatible with 2.5 and earlier files as a result
            if (savedWith >= new Version(2, 6, 0)) return;
            Version ourVersion = PdnInfo.GetVersion();
            var ourVersion2 = new Version(ourVersion.Major, ourVersion.Minor);
            var ourVersion3 = new Version(ourVersion.Major, ourVersion.Minor, ourVersion.Build);

            int fields = savedWith < ourVersion2 ? 2 : 3;

            string format = PdnResources.GetString("SavedWithOlderVersion.Format");
            string text = string.Format(format, savedWith.ToString(fields), ourVersion.ToString(fields));

            // TODO: should we even bother to inform them? It is probably more annoying than not,
            //       especially since older versions will say "Hey this file is corrupt OR saved with a newer version"
            //Utility.InfoBox(this, text);
        }

        /// <summary>
        /// Computes what the size of a new document should be. If the screen is in a normal,
        /// wider-than-tall (landscape) mode then it returns 800x600. If the screen is in a
        /// taller-than-wide (portrait) mode then it retusn 600x800. If the screen is square
        /// then it returns 800x600.
        /// </summary>
        public Size GetNewDocumentSize()
        {
            var findForm = FindForm() as PdnBaseForm;

            if (findForm != null && findForm.ScreenAspect < 1.0)
            {
                return new Size(600, 800);
            }
            return new Size(800, 600);
        }

        private void CommonActionsStripButtonClick(object sender, EventArgs<CommonAction> e)
        {
            CommonAction ca = e.Data;

            switch (ca)
            {
                case CommonAction.New:
                    PerformAction(new NewImageAction());
                    break;

                case CommonAction.Open:
                    PerformAction(new OpenFileAction());
                    break;

                case CommonAction.Save:
                    if (ActiveDocumentWorkspace != null)
                    {
                        ActiveDocumentWorkspace.DoSave();
                    }
                    break;

                case CommonAction.Print:
                    if (ActiveDocumentWorkspace != null)
                    {
                        var pa = new PrintAction();
                        ActiveDocumentWorkspace.PerformAction(pa);
                    }
                    break;

                case CommonAction.Cut:
                    if (ActiveDocumentWorkspace != null)
                    {
                        var cutAction = new CutAction();
                        cutAction.PerformAction(ActiveDocumentWorkspace);
                    }

                    break;

                case CommonAction.Copy:
                    if (ActiveDocumentWorkspace != null)
                    {
                        var ctca = new CopyToClipboardAction(ActiveDocumentWorkspace);
                        ctca.PerformAction();
                    }
                    break;

                case CommonAction.Paste:
                    if (ActiveDocumentWorkspace != null)
                    {
                        var pa = new PasteAction(ActiveDocumentWorkspace);
                        pa.PerformAction();
                    }

                    break;

                case CommonAction.CropToSelection:
                    if (ActiveDocumentWorkspace != null)
                    {
                        using (new PushNullToolMode(ActiveDocumentWorkspace))
                        {
                            ActiveDocumentWorkspace.ExecuteFunction(new CropToSelectionFunction());
                        }
                    }

                    break;

                case CommonAction.Deselect:
                    if (ActiveDocumentWorkspace != null)
                    {
                        ActiveDocumentWorkspace.ExecuteFunction(new DeselectFunction());
                    }
                    break;

                case CommonAction.Undo:
                    if (ActiveDocumentWorkspace != null)
                    {
                        ActiveDocumentWorkspace.PerformAction(new HistoryUndoAction());
                    }
                    break;

                case CommonAction.Redo:
                    if (ActiveDocumentWorkspace != null)
                    {
                        ActiveDocumentWorkspace.PerformAction(new HistoryRedoAction());
                    }
                    break;

                default:
                    throw new InvalidEnumArgumentException("e.Data");
            }

            if (ActiveDocumentWorkspace != null)
            {
                ActiveDocumentWorkspace.Focus();
            }
        }
    }
}
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