ComponentEditorForm.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / WinForms / Managed / System / WinForms / Design / ComponentEditorForm.cs / 1 / ComponentEditorForm.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms.Design { 
    using System.Runtime.InteropServices; 
    using System.Runtime.Remoting;
    using System.ComponentModel; 
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis;
    using System;
    using System.Security.Permissions; 
    using System.Windows.Forms;
    using System.Windows.Forms.Internal; 
    using System.Drawing; 
    using System.Reflection;
    using System.ComponentModel.Design; 
    using System.Windows.Forms.ComponentModel;
    using Microsoft.Win32;
    using Message = System.Windows.Forms.Message;
 
    /// 
    ///  
    /// Provides a user interface for . 
    /// 
    [ComVisible(true), 
     ClassInterface(ClassInterfaceType.AutoDispatch)
    ]
    [ToolboxItem(false)]
    [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.InheritanceDemand, Name="FullTrust")] 
    [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")]
    public class ComponentEditorForm : Form { 
        private IComponent component; 
        private Type[] pageTypes;
        private ComponentEditorPageSite[] pageSites; 
        private Size maxSize = System.Drawing.Size.Empty;
        private int initialActivePage;
        private int activePage;
        private bool dirty; 
        private bool firstActivate;
 
        private Panel pageHost = new Panel(); 
        private PageSelector selector;
        private ImageList selectorImageList; 
        private Button okButton;
        private Button cancelButton;
        private Button applyButton;
        private Button helpButton; 

        // private DesignerTransaction transaction; 
 
        private const int BUTTON_WIDTH = 80;
        private const int BUTTON_HEIGHT = 23; 
        private const int BUTTON_PAD = 6;
        private const int MIN_SELECTOR_WIDTH = 90;
        private const int SELECTOR_PADDING = 10;
        private const int STRIP_HEIGHT = 4; 

        ///  
        ///  
        ///    
        ///       Initializes a new instance of the  class. 
        ///    
        /// 
        public ComponentEditorForm(object component, Type[] pageTypes) : base() {
 
            if (!(component is IComponent)) {
               throw new ArgumentException(SR.GetString(SR.ComponentEditorFormBadComponent),"component"); 
            } 
            this.component = (IComponent)component;
            this.pageTypes = pageTypes; 
            dirty = false;
            firstActivate = true;
            activePage = -1;
            initialActivePage = 0; 

            FormBorderStyle = FormBorderStyle.FixedDialog; 
            MinimizeBox = false; 
            MaximizeBox = false;
            ShowInTaskbar = false; 
            Icon = null;
            StartPosition = FormStartPosition.CenterParent;

            OnNewObjects(); 
            OnConfigureUI();
        } 
 
        /// 
        ///  
        ///     Applies any changes in the set of ComponentPageControl to the actual component.
        /// 
        /// 
        internal virtual void ApplyChanges(bool lastApply) { 
            if (dirty) {
                IComponentChangeService changeService = null; 
 
                if (component.Site != null) {
                    changeService = (IComponentChangeService)component.Site.GetService(typeof(IComponentChangeService)); 
                    if (changeService != null) {
                        try {
                            changeService.OnComponentChanging(component, null);
                        } 
                        catch (CheckoutException e) {
                            if (e == CheckoutException.Canceled) { 
                                return; 
                            }
                            throw e; 
                        }
                    }
                }
 
                for (int n = 0; n < pageSites.Length; n++) {
                    if (pageSites[n].Dirty) { 
                        pageSites[n].GetPageControl().ApplyChanges(); 
                        pageSites[n].Dirty = false;
                    } 
                }

                if (changeService != null) {
                    changeService.OnComponentChanged(component, null, null, null); 
                }
 
                applyButton.Enabled = false; 
                cancelButton.Text = SR.GetString(SR.CloseCaption);
                dirty = false; 

                if (lastApply == false) {
                    for (int n = 0; n < pageSites.Length; n++) {
                        pageSites[n].GetPageControl().OnApplyComplete(); 
                    }
                } 
 
                /*
                if (transaction != null) { 
                    transaction.Commit();
                    CreateNewTransaction();
                }
                */ 
            }
        } 
 
        /// 
        ///  
        ///    
        ///       Hide the property
        ///    
        ///  
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public override bool AutoSize 
        { 
            get
            { 
                return base.AutoSize;
            }
            set
            { 
                base.AutoSize = value;
            } 
        } 

        ///  
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        new public event EventHandler AutoSizeChanged
        {
            add 
            {
                base.AutoSizeChanged += value; 
            } 
            remove
            { 
                base.AutoSizeChanged -= value;
            }
        }
 

        /* 
        private void CreateNewTransaction() { 
            IDesignerHost host = component.Site.GetService(typeof(IDesignerHost)) as IDesignerHost;
            transaction = host.CreateTransaction(SR.GetString(SR.ComponentEditorFormEditTransaction, component.Site.Name)); 
        }
        */

        ///  
        /// 
        ///     Handles ok/cancel/apply/help button click events 
        ///  
        /// 
        private void OnButtonClick(object sender, EventArgs e) { 
            if (sender == okButton) {
                ApplyChanges(true);
                DialogResult = DialogResult.OK;
            } 
            else if (sender == cancelButton) {
                DialogResult = DialogResult.Cancel; 
            } 
            else if (sender == applyButton) {
                ApplyChanges(false); 
            }
            else if (sender == helpButton) {
                ShowPageHelp();
            } 
        }
 
        ///  
        /// 
        ///     Lays out the UI of the form. 
        /// 
        /// 
        private void OnConfigureUI() {
            Font uiFont = Control.DefaultFont; 
            if (component.Site != null) {
                IUIService uiService = (IUIService)component.Site.GetService(typeof(IUIService)); 
                if (uiService != null) { 
                    uiFont = (Font)uiService.Styles["DialogFont"];
                } 
            }

            this.Font = uiFont;
 
            okButton = new Button();
            cancelButton = new Button(); 
            applyButton = new Button(); 
            helpButton = new Button();
 
            selectorImageList = new ImageList();
            selectorImageList.ImageSize = new Size(16, 16);
            selector = new PageSelector();
 
            selector.ImageList = selectorImageList;
            selector.AfterSelect += new TreeViewEventHandler(this.OnSelChangeSelector); 
 
            Label grayStrip = new Label();
            grayStrip.BackColor = SystemColors.ControlDark; 

            int selectorWidth = MIN_SELECTOR_WIDTH;

            if (pageSites != null) { 
                // Add the nodes corresponding to the pages
                for (int n = 0; n < pageSites.Length; n++) { 
                    ComponentEditorPage page = pageSites[n].GetPageControl(); 

                    string title = page.Title; 
                    Graphics graphics = CreateGraphicsInternal();
                    int titleWidth = (int) graphics.MeasureString(title, Font).Width;
                    graphics.Dispose();
                    selectorImageList.Images.Add(page.Icon.ToBitmap()); 

                    selector.Nodes.Add(new TreeNode(title, n, n)); 
                    if (titleWidth > selectorWidth) 
                        selectorWidth = titleWidth;
                } 
            }
            selectorWidth += SELECTOR_PADDING;

            string caption = String.Empty; 
            ISite site = component.Site;
            if (site != null) { 
                caption = SR.GetString(SR.ComponentEditorFormProperties, site.Name); 
            }
            else { 
                caption = SR.GetString(SR.ComponentEditorFormPropertiesNoName);
            }
            this.Text = caption;
 

            Rectangle pageHostBounds = new Rectangle(2 * BUTTON_PAD + selectorWidth, 2 * BUTTON_PAD + STRIP_HEIGHT, 
                                                     maxSize.Width, maxSize.Height); 
            pageHost.Bounds = pageHostBounds;
            grayStrip.Bounds = new Rectangle(pageHostBounds.X, BUTTON_PAD, 
                                             pageHostBounds.Width, STRIP_HEIGHT);

            if (pageSites != null) {
                Rectangle pageBounds = new Rectangle(0, 0, pageHostBounds.Width, pageHostBounds.Height); 
                for (int n = 0; n < pageSites.Length; n++) {
                    ComponentEditorPage page = pageSites[n].GetPageControl(); 
                    page.GetControl().Bounds = pageBounds; 
                }
            } 

            int xFrame = SystemInformation.FixedFrameBorderSize.Width;
            Rectangle bounds = pageHostBounds;
            Size size = new Size(bounds.Width + 3 * (BUTTON_PAD + xFrame) + selectorWidth, 
                                   bounds.Height + STRIP_HEIGHT + 4 * BUTTON_PAD + BUTTON_HEIGHT +
                                   2 * xFrame + SystemInformation.CaptionHeight); 
            this.Size = size; 

            selector.Bounds = new Rectangle(BUTTON_PAD, BUTTON_PAD, 
                                            selectorWidth, bounds.Height + STRIP_HEIGHT + 2 * BUTTON_PAD + BUTTON_HEIGHT);

            bounds.X = bounds.Width + bounds.X - BUTTON_WIDTH;
            bounds.Y = bounds.Height + bounds.Y + BUTTON_PAD; 
            bounds.Width = BUTTON_WIDTH;
            bounds.Height = BUTTON_HEIGHT; 
 
            helpButton.Bounds = bounds;
            helpButton.Text = SR.GetString(SR.HelpCaption); 
            helpButton.Click += new EventHandler(this.OnButtonClick);
            helpButton.Enabled = false;
            helpButton.FlatStyle = FlatStyle.System;
 
            bounds.X -= (BUTTON_WIDTH + BUTTON_PAD);
            applyButton.Bounds = bounds; 
            applyButton.Text = SR.GetString(SR.ApplyCaption); 
            applyButton.Click += new EventHandler(this.OnButtonClick);
            applyButton.Enabled = false; 
            applyButton.FlatStyle = FlatStyle.System;

            bounds.X -= (BUTTON_WIDTH + BUTTON_PAD);
            cancelButton.Bounds = bounds; 
            cancelButton.Text = SR.GetString(SR.CancelCaption);
            cancelButton.Click += new EventHandler(this.OnButtonClick); 
            cancelButton.FlatStyle = FlatStyle.System; 
            this.CancelButton = cancelButton;
 
            bounds.X -= (BUTTON_WIDTH + BUTTON_PAD);
            okButton.Bounds = bounds;
            okButton.Text = SR.GetString(SR.OKCaption);
            okButton.Click += new EventHandler(this.OnButtonClick); 
            okButton.FlatStyle = FlatStyle.System;
            this.AcceptButton = okButton; 
 
            this.Controls.Clear();
            this.Controls.AddRange(new Control[] { 
                selector,
                grayStrip,
                pageHost,
                okButton, 
                cancelButton,
                applyButton, 
                helpButton 
            });
 
            #pragma warning disable 618
            // continuing with the old autoscale base size stuff, it works,
            // and is currently set to a non-standard height
            AutoScaleBaseSize = new Size(5, 14); 
            ApplyAutoScaling();
            #pragma warning restore 618 
 

        } 

        /// 
        /// 
        ///  
        /// 
        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")] 
        // SECREVIEW: This seems safe, but could anything dangerous occur here? 
        protected override void OnActivated(EventArgs e) {
            base.OnActivated(e); 

            if (firstActivate) {
                firstActivate = false;
 
                selector.SelectedNode = selector.Nodes[initialActivePage];
                pageSites[initialActivePage].Active = true; 
                activePage = initialActivePage; 

                helpButton.Enabled = pageSites[activePage].GetPageControl().SupportsHelp(); 
            }
        }

        ///  
        /// 
        ///  
        ///  
        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")]
        // SECREVIEW: This seems safe, but could anything dangerous occur here? 
        protected override void OnHelpRequested(HelpEventArgs e) {
            base.OnHelpRequested(e);
            ShowPageHelp();
        } 

        ///  
        ///  
        ///     Called to initialize this form with the new component.
        ///  
        /// 
        private void OnNewObjects() {
            pageSites = null;
            maxSize = new Size(3 * (BUTTON_WIDTH + BUTTON_PAD), 24 * pageTypes.Length); 

            pageSites = new ComponentEditorPageSite[pageTypes.Length]; 
 
            // create sites for them
            // 
            for (int n = 0; n < pageTypes.Length; n++) {
                pageSites[n] = new ComponentEditorPageSite(pageHost, pageTypes[n], component, this);
                ComponentEditorPage page = pageSites[n].GetPageControl();
 
                Size pageSize = page.Size;
                if (pageSize.Width > maxSize.Width) 
                    maxSize.Width = pageSize.Width; 
                if (pageSize.Height > maxSize.Height)
                    maxSize.Height = pageSize.Height; 
            }

            // and set them all to an ideal size
            // 
            for (int n = 0; n < pageSites.Length; n++) {
                pageSites[n].GetPageControl().Size = maxSize; 
            } 
        }
 
        /// 
        /// 
        ///     Handles switching between pages.
        ///  
        /// 
        protected virtual void OnSelChangeSelector(object source, TreeViewEventArgs e) { 
            if (firstActivate == true) { 
                // treeview seems to fire a change event when it is first setup before
                // the form is activated 
                return;
            }

            int newPage = selector.SelectedNode.Index; 
            Debug.Assert((newPage >= 0) && (newPage < pageSites.Length),
                         "Invalid page selected"); 
 
            if (newPage == activePage)
                return; 

            if (activePage != -1) {
                if (pageSites[activePage].AutoCommit)
                    ApplyChanges(false); 
                pageSites[activePage].Active = false;
            } 
 
            activePage = newPage;
            pageSites[activePage].Active = true; 
            helpButton.Enabled = pageSites[activePage].GetPageControl().SupportsHelp();
        }

        ///  
        /// 
        ///    Provides a method to override in order to pre-process input messages before 
        ///       they are dispatched. 
        /// 
        [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)] 
        public override bool PreProcessMessage(ref Message msg) {
            if (null != pageSites && pageSites[activePage].GetPageControl().IsPageMessage(ref msg))
                return true;
 
            return base.PreProcessMessage(ref msg);
        } 
 
        /// 
        ///  
        ///     Sets the controls of the form to dirty.  This enables the "apply"
        ///     button.
        /// 
        internal virtual void SetDirty() { 
            dirty = true;
            applyButton.Enabled = true; 
            cancelButton.Text = SR.GetString(SR.CancelCaption); 
        }
 
        /// 
        /// 
        ///    Shows the form. The form will have no owner window.
        ///  
        public virtual DialogResult ShowForm() {
            return ShowForm(null, 0); 
        } 

        ///  
        /// 
        ///     Shows the form and the specified page. The form will have no owner window.
        /// 
        public virtual DialogResult ShowForm(int page) { 
            return ShowForm(null, page);
        } 
 
        /// 
        ///  
        ///    Shows the form with the specified owner.
        /// 
        public virtual DialogResult ShowForm(IWin32Window owner) {
            return ShowForm(owner, 0); 
        }
 
        ///  
        /// 
        ///    Shows the form and the specified page with the specified owner. 
        /// 
        public virtual DialogResult ShowForm(IWin32Window owner, int page) {
            initialActivePage = page;
 
            // CreateNewTransaction();
            try { 
                ShowDialog(owner); 
            }
            finally { 
                /*
                if (DialogResult == DialogResult.OK) {
                    transaction.Commit();
                } 
                else
                { 
                    transaction.Cancel(); 
                }
                */ 
            }

            return DialogResult;
        } 

        ///  
        ///  
        ///     Shows help for the active page.
        ///  
        /// 
        private void ShowPageHelp() {
            Debug.Assert(activePage != -1);
 
            if (pageSites[activePage].GetPageControl().SupportsHelp()) {
                pageSites[activePage].GetPageControl().ShowHelp(); 
            } 
        }
 
        /// 
        /// 
        ///     Implements a standard version of ComponentEditorPageSite for use within a
        ///     ComponentEditorForm. 
        /// 
        ///  
        private sealed class ComponentEditorPageSite : IComponentEditorPageSite { 
            internal IComponent component;
            internal ComponentEditorPage pageControl; 
            internal Control parent;
            internal bool isActive;
            internal bool isDirty;
            private ComponentEditorForm form; 

            ///  
            ///  
            ///     Creates the page site.
            ///  
            /// 
            internal ComponentEditorPageSite(Control parent, Type pageClass, IComponent component, ComponentEditorForm form) {
                this.component = component;
                this.parent = parent; 
                this.isActive = false;
                this.isDirty = false; 
 
                if (form == null)
                    throw new ArgumentNullException("form"); 

                this.form = form;

                try { 
                    pageControl = (ComponentEditorPage)SecurityUtils.SecureCreateInstance(pageClass);
                } 
                catch (TargetInvocationException e) { 
                    Debug.Fail(e.ToString());
                    throw new TargetInvocationException(SR.GetString(SR.ExceptionCreatingCompEditorControl, e.ToString()), e.InnerException); 
                }

                pageControl.SetSite(this);
                pageControl.SetComponent(component); 
            }
 
            ///  
            /// 
            ///     Called by the ComponentEditorForm to activate / deactivate the page. 
            /// 
            /// 
            internal bool Active {
                set { 
                    if (value) {
                        // make sure the page has been created 
                        pageControl.CreateControl(); 

                        // activate it and give it focus 
                        pageControl.Activate();
                    }
                    else {
                        pageControl.Deactivate(); 
                    }
                    isActive = value; 
                } 
            }
 
            internal bool AutoCommit {
                get {
                    return pageControl.CommitOnDeactivate;
                } 
            }
 
            internal bool Dirty { 
                get {
                    return isDirty; 
                }
                set {
                    isDirty = value;
                } 
            }
 
            ///  
            /// 
            ///     Called by a page to return a parenting control for itself. 
            /// 
            /// 
            public Control GetControl() {
                return parent; 
            }
 
            ///  
            /// 
            ///     Called by the ComponentEditorForm to get the actual page. 
            /// 
            /// 
            internal ComponentEditorPage GetPageControl() {
                return pageControl; 
            }
 
            ///  
            /// 
            ///     Called by a page to mark it's contents as dirty. 
            /// 
            /// 
            public void SetDirty() {
                if (isActive) 
                    Dirty = true;
                    form.SetDirty(); 
            } 
        }
 
        /// 
        /// 
        /// 
        ///  
        //
 
        internal sealed class PageSelector : TreeView { 
            private const int PADDING_VERT = 3;
            private const int PADDING_HORZ = 4; 

            private const int SIZE_ICON_X = 16;
            private const int SIZE_ICON_Y = 16;
 
            private const int STATE_NORMAL = 0;
            private const int STATE_SELECTED = 1; 
            private const int STATE_HOT = 2; 

            private IntPtr hbrushDither; 


            public PageSelector() {
                this.HotTracking = true; 
                this.HideSelection = false;
                this.BackColor = SystemColors.Control; 
                this.Indent = 0; 
                this.LabelEdit = false;
                this.Scrollable = false; 
                this.ShowLines = false;
                this.ShowPlusMinus = false;
                this.ShowRootLines = false;
                this.BorderStyle = BorderStyle.None; 
                this.Indent = 0;
                this.FullRowSelect = true; 
            } 

 

            protected override CreateParams CreateParams {
                [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)]
                get { 
                    CreateParams cp = base.CreateParams;
 
                    cp.ExStyle |= NativeMethods.WS_EX_STATICEDGE; 
                    return cp;
                } 
            }

            private void CreateDitherBrush() {
                Debug.Assert(hbrushDither == IntPtr.Zero, "Brush should not be recreated."); 

                short[] patternBits = new short[] { 
                    unchecked((short)0xAAAA), unchecked((short)0x5555), unchecked((short)0xAAAA), unchecked((short)0x5555), 
                    unchecked((short)0xAAAA), unchecked((short)0x5555), unchecked((short)0xAAAA), unchecked((short)0x5555)
                }; 

                IntPtr hbitmapTemp = SafeNativeMethods.CreateBitmap(8, 8, 1, 1, patternBits);
                Debug.Assert(hbitmapTemp != IntPtr.Zero,
                             "could not create dither bitmap. Page selector UI will not be correct"); 

                if (hbitmapTemp != IntPtr.Zero) { 
                    hbrushDither = SafeNativeMethods.CreatePatternBrush(new HandleRef(null, hbitmapTemp)); 

                    Debug.Assert(hbrushDither != IntPtr.Zero, 
                                 "Unable to created dithered brush. Page selector UI will not be correct");

                    SafeNativeMethods.DeleteObject(new HandleRef(null, hbitmapTemp));
                } 
            }
 
            private void DrawTreeItem(string itemText, int imageIndex, IntPtr dc, NativeMethods.RECT rcIn, 
                                        int state, int backColor, int textColor) {
                IntNativeMethods.SIZE size = new IntNativeMethods.SIZE(); 
                IntNativeMethods.RECT rc2 = new IntNativeMethods.RECT();
                IntNativeMethods.RECT rc = new IntNativeMethods.RECT(rcIn.left, rcIn.top, rcIn.right, rcIn.bottom);
                ImageList imagelist = this.ImageList;
                IntPtr hfontOld = IntPtr.Zero; 

                // Select the font of the dialog, so we don't get the underlined font 
                // when the item is being tracked 
                if ((state & STATE_HOT) != 0)
                    hfontOld = SafeNativeMethods.SelectObject(new HandleRef(null, dc), new HandleRef(Parent, ((Control)Parent).FontHandle)); 

                // Fill the background
                if (((state & STATE_SELECTED) != 0) && (hbrushDither != IntPtr.Zero)) {
                    FillRectDither(dc, rcIn); 
                    SafeNativeMethods.SetBkMode(new HandleRef(null, dc), NativeMethods.TRANSPARENT);
                } 
                else { 
                    SafeNativeMethods.SetBkColor(new HandleRef(null, dc), backColor);
                    IntUnsafeNativeMethods.ExtTextOut(new HandleRef(null, dc), 0, 0, NativeMethods.ETO_CLIPPED | NativeMethods.ETO_OPAQUE, ref rc, null, 0, null); 
                }

                // Get the height of the font
                IntUnsafeNativeMethods.GetTextExtentPoint32(new HandleRef(null, dc), itemText, size); 

                // Draw the caption 
                rc2.left = rc.left + SIZE_ICON_X + 2 * PADDING_HORZ; 
                rc2.top = rc.top + (((rc.bottom - rc.top) - size.cy) >> 1);
                rc2.bottom = rc2.top + size.cy; 
                rc2.right = rc.right;
                SafeNativeMethods.SetTextColor(new HandleRef(null, dc), textColor);
                IntUnsafeNativeMethods.DrawText(new HandleRef(null, dc), itemText, ref rc2,
                                 IntNativeMethods.DT_LEFT | IntNativeMethods.DT_VCENTER | IntNativeMethods.DT_END_ELLIPSIS | IntNativeMethods.DT_NOPREFIX); 

                SafeNativeMethods.ImageList_Draw(new HandleRef(imagelist, imagelist.Handle), imageIndex, new HandleRef(null, dc), 
                                       PADDING_HORZ, rc.top + (((rc.bottom - rc.top) - SIZE_ICON_Y) >> 1), 
                                       NativeMethods.ILD_TRANSPARENT);
 
                // Draw the hot-tracking border if needed
                if ((state & STATE_HOT) != 0) {
                    int savedColor;
 
                    // top left
                    savedColor = SafeNativeMethods.SetBkColor(new HandleRef(null, dc), ColorTranslator.ToWin32(SystemColors.ControlLightLight)); 
                    rc2.left = rc.left; 
                    rc2.top = rc.top;
                    rc2.bottom = rc.top + 1; 
                    rc2.right = rc.right;
                    IntUnsafeNativeMethods.ExtTextOut(new HandleRef(null, dc), 0, 0, NativeMethods.ETO_OPAQUE, ref rc2, null, 0, null);
                    rc2.bottom = rc.bottom;
                    rc2.right = rc.left + 1; 
                    IntUnsafeNativeMethods.ExtTextOut(new HandleRef(null, dc), 0, 0, NativeMethods.ETO_OPAQUE, ref rc2, null, 0, null);
 
                    // bottom right 
                    SafeNativeMethods.SetBkColor(new HandleRef(null, dc), ColorTranslator.ToWin32(SystemColors.ControlDark));
                    rc2.left = rc.left; 
                    rc2.right = rc.right;
                    rc2.top = rc.bottom - 1;
                    rc2.bottom = rc.bottom;
                    IntUnsafeNativeMethods.ExtTextOut(new HandleRef(null, dc), 0, 0, NativeMethods.ETO_OPAQUE, ref rc2, null, 0, null); 
                    rc2.left = rc.right - 1;
                    rc2.top = rc.top; 
                    IntUnsafeNativeMethods.ExtTextOut(new HandleRef(null, dc), 0, 0, NativeMethods.ETO_OPAQUE, ref rc2, null, 0, null); 

                    SafeNativeMethods.SetBkColor(new HandleRef(null, dc), savedColor); 
                }

                if (hfontOld != IntPtr.Zero)
                    SafeNativeMethods.SelectObject(new HandleRef(null, dc), new HandleRef(null, hfontOld)); 
            }
 
            protected override void OnHandleCreated(EventArgs e) { 
                base.OnHandleCreated(e);
 
                int itemHeight;

                itemHeight = (int)UnsafeNativeMethods.SendMessage(new HandleRef(this, Handle), NativeMethods.TVM_GETITEMHEIGHT, 0, 0);
                itemHeight += 2 * PADDING_VERT; 
                UnsafeNativeMethods.SendMessage(new HandleRef(this, Handle), NativeMethods.TVM_SETITEMHEIGHT, itemHeight, 0);
 
                if (hbrushDither == IntPtr.Zero) { 
                    CreateDitherBrush();
                } 
            }

            private void OnCustomDraw(ref Message m) {
                NativeMethods.NMTVCUSTOMDRAW nmtvcd = (NativeMethods.NMTVCUSTOMDRAW)m.GetLParam(typeof(NativeMethods.NMTVCUSTOMDRAW)); 

                switch (nmtvcd.nmcd.dwDrawStage) { 
                    case NativeMethods.CDDS_PREPAINT: 
                        m.Result = (IntPtr)(NativeMethods.CDRF_NOTIFYITEMDRAW | NativeMethods.CDRF_NOTIFYPOSTPAINT);
                        break; 
                    case NativeMethods.CDDS_ITEMPREPAINT:
                        {
                            TreeNode itemNode = TreeNode.FromHandle(this, (IntPtr)nmtvcd.nmcd.dwItemSpec);
                            if (itemNode != null) { 
                                int state = STATE_NORMAL;
                                int itemState = nmtvcd.nmcd.uItemState; 
 
                                if (((itemState & NativeMethods.CDIS_HOT) != 0) ||
                                   ((itemState & NativeMethods.CDIS_FOCUS) != 0)) 
                                   state |= STATE_HOT;
                                if ((itemState & NativeMethods.CDIS_SELECTED) != 0)
                                   state |= STATE_SELECTED;
 
                                DrawTreeItem(itemNode.Text, itemNode.ImageIndex,
                                         nmtvcd.nmcd.hdc, nmtvcd.nmcd.rc, 
                                         state, ColorTranslator.ToWin32(SystemColors.Control), ColorTranslator.ToWin32(SystemColors.ControlText)); 
                            }
                            m.Result = (IntPtr)NativeMethods.CDRF_SKIPDEFAULT; 

                        }
                        break;
                    case NativeMethods.CDDS_POSTPAINT: 
                        m.Result = (IntPtr)NativeMethods.CDRF_SKIPDEFAULT;
                        break; 
                    default: 
                        m.Result = (IntPtr)NativeMethods.CDRF_DODEFAULT;
                        break; 
                }
            }

            protected override void OnHandleDestroyed(EventArgs e) { 
                base.OnHandleDestroyed(e);
 
                if (!RecreatingHandle && (hbrushDither != IntPtr.Zero)) { 
                    SafeNativeMethods.DeleteObject(new HandleRef(this, hbrushDither));
                    hbrushDither = IntPtr.Zero; 
                }
            }

            private void FillRectDither(IntPtr dc, NativeMethods.RECT rc) { 
                IntPtr hbrushOld = SafeNativeMethods.SelectObject(new HandleRef(null, dc), new HandleRef(this, hbrushDither));
 
                if (hbrushOld != IntPtr.Zero) { 
                    int oldTextColor, oldBackColor;
 
                    oldTextColor = SafeNativeMethods.SetTextColor(new HandleRef(null, dc), ColorTranslator.ToWin32(SystemColors.ControlLightLight));
                    oldBackColor = SafeNativeMethods.SetBkColor(new HandleRef(null, dc), ColorTranslator.ToWin32(SystemColors.Control));

                    SafeNativeMethods.PatBlt(new HandleRef(null, dc), rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, NativeMethods.PATCOPY); 
                    SafeNativeMethods.SetTextColor(new HandleRef(null, dc), oldTextColor);
                    SafeNativeMethods.SetBkColor(new HandleRef(null, dc), oldBackColor); 
                } 
            }
 
            [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)]
            protected override void WndProc(ref Message m) {
                if (m.Msg == NativeMethods.WM_REFLECT + NativeMethods.WM_NOTIFY) {
                    NativeMethods.NMHDR nmh = (NativeMethods.NMHDR)m.GetLParam(typeof(NativeMethods.NMHDR)); 
                    if (nmh.code == NativeMethods.NM_CUSTOMDRAW) {
                        OnCustomDraw(ref m); 
                        return; 
                    }
                } 

                base.WndProc(ref m);
            }
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms.Design { 
    using System.Runtime.InteropServices; 
    using System.Runtime.Remoting;
    using System.ComponentModel; 
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis;
    using System;
    using System.Security.Permissions; 
    using System.Windows.Forms;
    using System.Windows.Forms.Internal; 
    using System.Drawing; 
    using System.Reflection;
    using System.ComponentModel.Design; 
    using System.Windows.Forms.ComponentModel;
    using Microsoft.Win32;
    using Message = System.Windows.Forms.Message;
 
    /// 
    ///  
    /// Provides a user interface for . 
    /// 
    [ComVisible(true), 
     ClassInterface(ClassInterfaceType.AutoDispatch)
    ]
    [ToolboxItem(false)]
    [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.InheritanceDemand, Name="FullTrust")] 
    [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")]
    public class ComponentEditorForm : Form { 
        private IComponent component; 
        private Type[] pageTypes;
        private ComponentEditorPageSite[] pageSites; 
        private Size maxSize = System.Drawing.Size.Empty;
        private int initialActivePage;
        private int activePage;
        private bool dirty; 
        private bool firstActivate;
 
        private Panel pageHost = new Panel(); 
        private PageSelector selector;
        private ImageList selectorImageList; 
        private Button okButton;
        private Button cancelButton;
        private Button applyButton;
        private Button helpButton; 

        // private DesignerTransaction transaction; 
 
        private const int BUTTON_WIDTH = 80;
        private const int BUTTON_HEIGHT = 23; 
        private const int BUTTON_PAD = 6;
        private const int MIN_SELECTOR_WIDTH = 90;
        private const int SELECTOR_PADDING = 10;
        private const int STRIP_HEIGHT = 4; 

        ///  
        ///  
        ///    
        ///       Initializes a new instance of the  class. 
        ///    
        /// 
        public ComponentEditorForm(object component, Type[] pageTypes) : base() {
 
            if (!(component is IComponent)) {
               throw new ArgumentException(SR.GetString(SR.ComponentEditorFormBadComponent),"component"); 
            } 
            this.component = (IComponent)component;
            this.pageTypes = pageTypes; 
            dirty = false;
            firstActivate = true;
            activePage = -1;
            initialActivePage = 0; 

            FormBorderStyle = FormBorderStyle.FixedDialog; 
            MinimizeBox = false; 
            MaximizeBox = false;
            ShowInTaskbar = false; 
            Icon = null;
            StartPosition = FormStartPosition.CenterParent;

            OnNewObjects(); 
            OnConfigureUI();
        } 
 
        /// 
        ///  
        ///     Applies any changes in the set of ComponentPageControl to the actual component.
        /// 
        /// 
        internal virtual void ApplyChanges(bool lastApply) { 
            if (dirty) {
                IComponentChangeService changeService = null; 
 
                if (component.Site != null) {
                    changeService = (IComponentChangeService)component.Site.GetService(typeof(IComponentChangeService)); 
                    if (changeService != null) {
                        try {
                            changeService.OnComponentChanging(component, null);
                        } 
                        catch (CheckoutException e) {
                            if (e == CheckoutException.Canceled) { 
                                return; 
                            }
                            throw e; 
                        }
                    }
                }
 
                for (int n = 0; n < pageSites.Length; n++) {
                    if (pageSites[n].Dirty) { 
                        pageSites[n].GetPageControl().ApplyChanges(); 
                        pageSites[n].Dirty = false;
                    } 
                }

                if (changeService != null) {
                    changeService.OnComponentChanged(component, null, null, null); 
                }
 
                applyButton.Enabled = false; 
                cancelButton.Text = SR.GetString(SR.CloseCaption);
                dirty = false; 

                if (lastApply == false) {
                    for (int n = 0; n < pageSites.Length; n++) {
                        pageSites[n].GetPageControl().OnApplyComplete(); 
                    }
                } 
 
                /*
                if (transaction != null) { 
                    transaction.Commit();
                    CreateNewTransaction();
                }
                */ 
            }
        } 
 
        /// 
        ///  
        ///    
        ///       Hide the property
        ///    
        ///  
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public override bool AutoSize 
        { 
            get
            { 
                return base.AutoSize;
            }
            set
            { 
                base.AutoSize = value;
            } 
        } 

        ///  
        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        new public event EventHandler AutoSizeChanged
        {
            add 
            {
                base.AutoSizeChanged += value; 
            } 
            remove
            { 
                base.AutoSizeChanged -= value;
            }
        }
 

        /* 
        private void CreateNewTransaction() { 
            IDesignerHost host = component.Site.GetService(typeof(IDesignerHost)) as IDesignerHost;
            transaction = host.CreateTransaction(SR.GetString(SR.ComponentEditorFormEditTransaction, component.Site.Name)); 
        }
        */

        ///  
        /// 
        ///     Handles ok/cancel/apply/help button click events 
        ///  
        /// 
        private void OnButtonClick(object sender, EventArgs e) { 
            if (sender == okButton) {
                ApplyChanges(true);
                DialogResult = DialogResult.OK;
            } 
            else if (sender == cancelButton) {
                DialogResult = DialogResult.Cancel; 
            } 
            else if (sender == applyButton) {
                ApplyChanges(false); 
            }
            else if (sender == helpButton) {
                ShowPageHelp();
            } 
        }
 
        ///  
        /// 
        ///     Lays out the UI of the form. 
        /// 
        /// 
        private void OnConfigureUI() {
            Font uiFont = Control.DefaultFont; 
            if (component.Site != null) {
                IUIService uiService = (IUIService)component.Site.GetService(typeof(IUIService)); 
                if (uiService != null) { 
                    uiFont = (Font)uiService.Styles["DialogFont"];
                } 
            }

            this.Font = uiFont;
 
            okButton = new Button();
            cancelButton = new Button(); 
            applyButton = new Button(); 
            helpButton = new Button();
 
            selectorImageList = new ImageList();
            selectorImageList.ImageSize = new Size(16, 16);
            selector = new PageSelector();
 
            selector.ImageList = selectorImageList;
            selector.AfterSelect += new TreeViewEventHandler(this.OnSelChangeSelector); 
 
            Label grayStrip = new Label();
            grayStrip.BackColor = SystemColors.ControlDark; 

            int selectorWidth = MIN_SELECTOR_WIDTH;

            if (pageSites != null) { 
                // Add the nodes corresponding to the pages
                for (int n = 0; n < pageSites.Length; n++) { 
                    ComponentEditorPage page = pageSites[n].GetPageControl(); 

                    string title = page.Title; 
                    Graphics graphics = CreateGraphicsInternal();
                    int titleWidth = (int) graphics.MeasureString(title, Font).Width;
                    graphics.Dispose();
                    selectorImageList.Images.Add(page.Icon.ToBitmap()); 

                    selector.Nodes.Add(new TreeNode(title, n, n)); 
                    if (titleWidth > selectorWidth) 
                        selectorWidth = titleWidth;
                } 
            }
            selectorWidth += SELECTOR_PADDING;

            string caption = String.Empty; 
            ISite site = component.Site;
            if (site != null) { 
                caption = SR.GetString(SR.ComponentEditorFormProperties, site.Name); 
            }
            else { 
                caption = SR.GetString(SR.ComponentEditorFormPropertiesNoName);
            }
            this.Text = caption;
 

            Rectangle pageHostBounds = new Rectangle(2 * BUTTON_PAD + selectorWidth, 2 * BUTTON_PAD + STRIP_HEIGHT, 
                                                     maxSize.Width, maxSize.Height); 
            pageHost.Bounds = pageHostBounds;
            grayStrip.Bounds = new Rectangle(pageHostBounds.X, BUTTON_PAD, 
                                             pageHostBounds.Width, STRIP_HEIGHT);

            if (pageSites != null) {
                Rectangle pageBounds = new Rectangle(0, 0, pageHostBounds.Width, pageHostBounds.Height); 
                for (int n = 0; n < pageSites.Length; n++) {
                    ComponentEditorPage page = pageSites[n].GetPageControl(); 
                    page.GetControl().Bounds = pageBounds; 
                }
            } 

            int xFrame = SystemInformation.FixedFrameBorderSize.Width;
            Rectangle bounds = pageHostBounds;
            Size size = new Size(bounds.Width + 3 * (BUTTON_PAD + xFrame) + selectorWidth, 
                                   bounds.Height + STRIP_HEIGHT + 4 * BUTTON_PAD + BUTTON_HEIGHT +
                                   2 * xFrame + SystemInformation.CaptionHeight); 
            this.Size = size; 

            selector.Bounds = new Rectangle(BUTTON_PAD, BUTTON_PAD, 
                                            selectorWidth, bounds.Height + STRIP_HEIGHT + 2 * BUTTON_PAD + BUTTON_HEIGHT);

            bounds.X = bounds.Width + bounds.X - BUTTON_WIDTH;
            bounds.Y = bounds.Height + bounds.Y + BUTTON_PAD; 
            bounds.Width = BUTTON_WIDTH;
            bounds.Height = BUTTON_HEIGHT; 
 
            helpButton.Bounds = bounds;
            helpButton.Text = SR.GetString(SR.HelpCaption); 
            helpButton.Click += new EventHandler(this.OnButtonClick);
            helpButton.Enabled = false;
            helpButton.FlatStyle = FlatStyle.System;
 
            bounds.X -= (BUTTON_WIDTH + BUTTON_PAD);
            applyButton.Bounds = bounds; 
            applyButton.Text = SR.GetString(SR.ApplyCaption); 
            applyButton.Click += new EventHandler(this.OnButtonClick);
            applyButton.Enabled = false; 
            applyButton.FlatStyle = FlatStyle.System;

            bounds.X -= (BUTTON_WIDTH + BUTTON_PAD);
            cancelButton.Bounds = bounds; 
            cancelButton.Text = SR.GetString(SR.CancelCaption);
            cancelButton.Click += new EventHandler(this.OnButtonClick); 
            cancelButton.FlatStyle = FlatStyle.System; 
            this.CancelButton = cancelButton;
 
            bounds.X -= (BUTTON_WIDTH + BUTTON_PAD);
            okButton.Bounds = bounds;
            okButton.Text = SR.GetString(SR.OKCaption);
            okButton.Click += new EventHandler(this.OnButtonClick); 
            okButton.FlatStyle = FlatStyle.System;
            this.AcceptButton = okButton; 
 
            this.Controls.Clear();
            this.Controls.AddRange(new Control[] { 
                selector,
                grayStrip,
                pageHost,
                okButton, 
                cancelButton,
                applyButton, 
                helpButton 
            });
 
            #pragma warning disable 618
            // continuing with the old autoscale base size stuff, it works,
            // and is currently set to a non-standard height
            AutoScaleBaseSize = new Size(5, 14); 
            ApplyAutoScaling();
            #pragma warning restore 618 
 

        } 

        /// 
        /// 
        ///  
        /// 
        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")] 
        // SECREVIEW: This seems safe, but could anything dangerous occur here? 
        protected override void OnActivated(EventArgs e) {
            base.OnActivated(e); 

            if (firstActivate) {
                firstActivate = false;
 
                selector.SelectedNode = selector.Nodes[initialActivePage];
                pageSites[initialActivePage].Active = true; 
                activePage = initialActivePage; 

                helpButton.Enabled = pageSites[activePage].GetPageControl().SupportsHelp(); 
            }
        }

        ///  
        /// 
        ///  
        ///  
        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")]
        // SECREVIEW: This seems safe, but could anything dangerous occur here? 
        protected override void OnHelpRequested(HelpEventArgs e) {
            base.OnHelpRequested(e);
            ShowPageHelp();
        } 

        ///  
        ///  
        ///     Called to initialize this form with the new component.
        ///  
        /// 
        private void OnNewObjects() {
            pageSites = null;
            maxSize = new Size(3 * (BUTTON_WIDTH + BUTTON_PAD), 24 * pageTypes.Length); 

            pageSites = new ComponentEditorPageSite[pageTypes.Length]; 
 
            // create sites for them
            // 
            for (int n = 0; n < pageTypes.Length; n++) {
                pageSites[n] = new ComponentEditorPageSite(pageHost, pageTypes[n], component, this);
                ComponentEditorPage page = pageSites[n].GetPageControl();
 
                Size pageSize = page.Size;
                if (pageSize.Width > maxSize.Width) 
                    maxSize.Width = pageSize.Width; 
                if (pageSize.Height > maxSize.Height)
                    maxSize.Height = pageSize.Height; 
            }

            // and set them all to an ideal size
            // 
            for (int n = 0; n < pageSites.Length; n++) {
                pageSites[n].GetPageControl().Size = maxSize; 
            } 
        }
 
        /// 
        /// 
        ///     Handles switching between pages.
        ///  
        /// 
        protected virtual void OnSelChangeSelector(object source, TreeViewEventArgs e) { 
            if (firstActivate == true) { 
                // treeview seems to fire a change event when it is first setup before
                // the form is activated 
                return;
            }

            int newPage = selector.SelectedNode.Index; 
            Debug.Assert((newPage >= 0) && (newPage < pageSites.Length),
                         "Invalid page selected"); 
 
            if (newPage == activePage)
                return; 

            if (activePage != -1) {
                if (pageSites[activePage].AutoCommit)
                    ApplyChanges(false); 
                pageSites[activePage].Active = false;
            } 
 
            activePage = newPage;
            pageSites[activePage].Active = true; 
            helpButton.Enabled = pageSites[activePage].GetPageControl().SupportsHelp();
        }

        ///  
        /// 
        ///    Provides a method to override in order to pre-process input messages before 
        ///       they are dispatched. 
        /// 
        [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)] 
        public override bool PreProcessMessage(ref Message msg) {
            if (null != pageSites && pageSites[activePage].GetPageControl().IsPageMessage(ref msg))
                return true;
 
            return base.PreProcessMessage(ref msg);
        } 
 
        /// 
        ///  
        ///     Sets the controls of the form to dirty.  This enables the "apply"
        ///     button.
        /// 
        internal virtual void SetDirty() { 
            dirty = true;
            applyButton.Enabled = true; 
            cancelButton.Text = SR.GetString(SR.CancelCaption); 
        }
 
        /// 
        /// 
        ///    Shows the form. The form will have no owner window.
        ///  
        public virtual DialogResult ShowForm() {
            return ShowForm(null, 0); 
        } 

        ///  
        /// 
        ///     Shows the form and the specified page. The form will have no owner window.
        /// 
        public virtual DialogResult ShowForm(int page) { 
            return ShowForm(null, page);
        } 
 
        /// 
        ///  
        ///    Shows the form with the specified owner.
        /// 
        public virtual DialogResult ShowForm(IWin32Window owner) {
            return ShowForm(owner, 0); 
        }
 
        ///  
        /// 
        ///    Shows the form and the specified page with the specified owner. 
        /// 
        public virtual DialogResult ShowForm(IWin32Window owner, int page) {
            initialActivePage = page;
 
            // CreateNewTransaction();
            try { 
                ShowDialog(owner); 
            }
            finally { 
                /*
                if (DialogResult == DialogResult.OK) {
                    transaction.Commit();
                } 
                else
                { 
                    transaction.Cancel(); 
                }
                */ 
            }

            return DialogResult;
        } 

        ///  
        ///  
        ///     Shows help for the active page.
        ///  
        /// 
        private void ShowPageHelp() {
            Debug.Assert(activePage != -1);
 
            if (pageSites[activePage].GetPageControl().SupportsHelp()) {
                pageSites[activePage].GetPageControl().ShowHelp(); 
            } 
        }
 
        /// 
        /// 
        ///     Implements a standard version of ComponentEditorPageSite for use within a
        ///     ComponentEditorForm. 
        /// 
        ///  
        private sealed class ComponentEditorPageSite : IComponentEditorPageSite { 
            internal IComponent component;
            internal ComponentEditorPage pageControl; 
            internal Control parent;
            internal bool isActive;
            internal bool isDirty;
            private ComponentEditorForm form; 

            ///  
            ///  
            ///     Creates the page site.
            ///  
            /// 
            internal ComponentEditorPageSite(Control parent, Type pageClass, IComponent component, ComponentEditorForm form) {
                this.component = component;
                this.parent = parent; 
                this.isActive = false;
                this.isDirty = false; 
 
                if (form == null)
                    throw new ArgumentNullException("form"); 

                this.form = form;

                try { 
                    pageControl = (ComponentEditorPage)SecurityUtils.SecureCreateInstance(pageClass);
                } 
                catch (TargetInvocationException e) { 
                    Debug.Fail(e.ToString());
                    throw new TargetInvocationException(SR.GetString(SR.ExceptionCreatingCompEditorControl, e.ToString()), e.InnerException); 
                }

                pageControl.SetSite(this);
                pageControl.SetComponent(component); 
            }
 
            ///  
            /// 
            ///     Called by the ComponentEditorForm to activate / deactivate the page. 
            /// 
            /// 
            internal bool Active {
                set { 
                    if (value) {
                        // make sure the page has been created 
                        pageControl.CreateControl(); 

                        // activate it and give it focus 
                        pageControl.Activate();
                    }
                    else {
                        pageControl.Deactivate(); 
                    }
                    isActive = value; 
                } 
            }
 
            internal bool AutoCommit {
                get {
                    return pageControl.CommitOnDeactivate;
                } 
            }
 
            internal bool Dirty { 
                get {
                    return isDirty; 
                }
                set {
                    isDirty = value;
                } 
            }
 
            ///  
            /// 
            ///     Called by a page to return a parenting control for itself. 
            /// 
            /// 
            public Control GetControl() {
                return parent; 
            }
 
            ///  
            /// 
            ///     Called by the ComponentEditorForm to get the actual page. 
            /// 
            /// 
            internal ComponentEditorPage GetPageControl() {
                return pageControl; 
            }
 
            ///  
            /// 
            ///     Called by a page to mark it's contents as dirty. 
            /// 
            /// 
            public void SetDirty() {
                if (isActive) 
                    Dirty = true;
                    form.SetDirty(); 
            } 
        }
 
        /// 
        /// 
        /// 
        ///  
        //
 
        internal sealed class PageSelector : TreeView { 
            private const int PADDING_VERT = 3;
            private const int PADDING_HORZ = 4; 

            private const int SIZE_ICON_X = 16;
            private const int SIZE_ICON_Y = 16;
 
            private const int STATE_NORMAL = 0;
            private const int STATE_SELECTED = 1; 
            private const int STATE_HOT = 2; 

            private IntPtr hbrushDither; 


            public PageSelector() {
                this.HotTracking = true; 
                this.HideSelection = false;
                this.BackColor = SystemColors.Control; 
                this.Indent = 0; 
                this.LabelEdit = false;
                this.Scrollable = false; 
                this.ShowLines = false;
                this.ShowPlusMinus = false;
                this.ShowRootLines = false;
                this.BorderStyle = BorderStyle.None; 
                this.Indent = 0;
                this.FullRowSelect = true; 
            } 

 

            protected override CreateParams CreateParams {
                [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)]
                get { 
                    CreateParams cp = base.CreateParams;
 
                    cp.ExStyle |= NativeMethods.WS_EX_STATICEDGE; 
                    return cp;
                } 
            }

            private void CreateDitherBrush() {
                Debug.Assert(hbrushDither == IntPtr.Zero, "Brush should not be recreated."); 

                short[] patternBits = new short[] { 
                    unchecked((short)0xAAAA), unchecked((short)0x5555), unchecked((short)0xAAAA), unchecked((short)0x5555), 
                    unchecked((short)0xAAAA), unchecked((short)0x5555), unchecked((short)0xAAAA), unchecked((short)0x5555)
                }; 

                IntPtr hbitmapTemp = SafeNativeMethods.CreateBitmap(8, 8, 1, 1, patternBits);
                Debug.Assert(hbitmapTemp != IntPtr.Zero,
                             "could not create dither bitmap. Page selector UI will not be correct"); 

                if (hbitmapTemp != IntPtr.Zero) { 
                    hbrushDither = SafeNativeMethods.CreatePatternBrush(new HandleRef(null, hbitmapTemp)); 

                    Debug.Assert(hbrushDither != IntPtr.Zero, 
                                 "Unable to created dithered brush. Page selector UI will not be correct");

                    SafeNativeMethods.DeleteObject(new HandleRef(null, hbitmapTemp));
                } 
            }
 
            private void DrawTreeItem(string itemText, int imageIndex, IntPtr dc, NativeMethods.RECT rcIn, 
                                        int state, int backColor, int textColor) {
                IntNativeMethods.SIZE size = new IntNativeMethods.SIZE(); 
                IntNativeMethods.RECT rc2 = new IntNativeMethods.RECT();
                IntNativeMethods.RECT rc = new IntNativeMethods.RECT(rcIn.left, rcIn.top, rcIn.right, rcIn.bottom);
                ImageList imagelist = this.ImageList;
                IntPtr hfontOld = IntPtr.Zero; 

                // Select the font of the dialog, so we don't get the underlined font 
                // when the item is being tracked 
                if ((state & STATE_HOT) != 0)
                    hfontOld = SafeNativeMethods.SelectObject(new HandleRef(null, dc), new HandleRef(Parent, ((Control)Parent).FontHandle)); 

                // Fill the background
                if (((state & STATE_SELECTED) != 0) && (hbrushDither != IntPtr.Zero)) {
                    FillRectDither(dc, rcIn); 
                    SafeNativeMethods.SetBkMode(new HandleRef(null, dc), NativeMethods.TRANSPARENT);
                } 
                else { 
                    SafeNativeMethods.SetBkColor(new HandleRef(null, dc), backColor);
                    IntUnsafeNativeMethods.ExtTextOut(new HandleRef(null, dc), 0, 0, NativeMethods.ETO_CLIPPED | NativeMethods.ETO_OPAQUE, ref rc, null, 0, null); 
                }

                // Get the height of the font
                IntUnsafeNativeMethods.GetTextExtentPoint32(new HandleRef(null, dc), itemText, size); 

                // Draw the caption 
                rc2.left = rc.left + SIZE_ICON_X + 2 * PADDING_HORZ; 
                rc2.top = rc.top + (((rc.bottom - rc.top) - size.cy) >> 1);
                rc2.bottom = rc2.top + size.cy; 
                rc2.right = rc.right;
                SafeNativeMethods.SetTextColor(new HandleRef(null, dc), textColor);
                IntUnsafeNativeMethods.DrawText(new HandleRef(null, dc), itemText, ref rc2,
                                 IntNativeMethods.DT_LEFT | IntNativeMethods.DT_VCENTER | IntNativeMethods.DT_END_ELLIPSIS | IntNativeMethods.DT_NOPREFIX); 

                SafeNativeMethods.ImageList_Draw(new HandleRef(imagelist, imagelist.Handle), imageIndex, new HandleRef(null, dc), 
                                       PADDING_HORZ, rc.top + (((rc.bottom - rc.top) - SIZE_ICON_Y) >> 1), 
                                       NativeMethods.ILD_TRANSPARENT);
 
                // Draw the hot-tracking border if needed
                if ((state & STATE_HOT) != 0) {
                    int savedColor;
 
                    // top left
                    savedColor = SafeNativeMethods.SetBkColor(new HandleRef(null, dc), ColorTranslator.ToWin32(SystemColors.ControlLightLight)); 
                    rc2.left = rc.left; 
                    rc2.top = rc.top;
                    rc2.bottom = rc.top + 1; 
                    rc2.right = rc.right;
                    IntUnsafeNativeMethods.ExtTextOut(new HandleRef(null, dc), 0, 0, NativeMethods.ETO_OPAQUE, ref rc2, null, 0, null);
                    rc2.bottom = rc.bottom;
                    rc2.right = rc.left + 1; 
                    IntUnsafeNativeMethods.ExtTextOut(new HandleRef(null, dc), 0, 0, NativeMethods.ETO_OPAQUE, ref rc2, null, 0, null);
 
                    // bottom right 
                    SafeNativeMethods.SetBkColor(new HandleRef(null, dc), ColorTranslator.ToWin32(SystemColors.ControlDark));
                    rc2.left = rc.left; 
                    rc2.right = rc.right;
                    rc2.top = rc.bottom - 1;
                    rc2.bottom = rc.bottom;
                    IntUnsafeNativeMethods.ExtTextOut(new HandleRef(null, dc), 0, 0, NativeMethods.ETO_OPAQUE, ref rc2, null, 0, null); 
                    rc2.left = rc.right - 1;
                    rc2.top = rc.top; 
                    IntUnsafeNativeMethods.ExtTextOut(new HandleRef(null, dc), 0, 0, NativeMethods.ETO_OPAQUE, ref rc2, null, 0, null); 

                    SafeNativeMethods.SetBkColor(new HandleRef(null, dc), savedColor); 
                }

                if (hfontOld != IntPtr.Zero)
                    SafeNativeMethods.SelectObject(new HandleRef(null, dc), new HandleRef(null, hfontOld)); 
            }
 
            protected override void OnHandleCreated(EventArgs e) { 
                base.OnHandleCreated(e);
 
                int itemHeight;

                itemHeight = (int)UnsafeNativeMethods.SendMessage(new HandleRef(this, Handle), NativeMethods.TVM_GETITEMHEIGHT, 0, 0);
                itemHeight += 2 * PADDING_VERT; 
                UnsafeNativeMethods.SendMessage(new HandleRef(this, Handle), NativeMethods.TVM_SETITEMHEIGHT, itemHeight, 0);
 
                if (hbrushDither == IntPtr.Zero) { 
                    CreateDitherBrush();
                } 
            }

            private void OnCustomDraw(ref Message m) {
                NativeMethods.NMTVCUSTOMDRAW nmtvcd = (NativeMethods.NMTVCUSTOMDRAW)m.GetLParam(typeof(NativeMethods.NMTVCUSTOMDRAW)); 

                switch (nmtvcd.nmcd.dwDrawStage) { 
                    case NativeMethods.CDDS_PREPAINT: 
                        m.Result = (IntPtr)(NativeMethods.CDRF_NOTIFYITEMDRAW | NativeMethods.CDRF_NOTIFYPOSTPAINT);
                        break; 
                    case NativeMethods.CDDS_ITEMPREPAINT:
                        {
                            TreeNode itemNode = TreeNode.FromHandle(this, (IntPtr)nmtvcd.nmcd.dwItemSpec);
                            if (itemNode != null) { 
                                int state = STATE_NORMAL;
                                int itemState = nmtvcd.nmcd.uItemState; 
 
                                if (((itemState & NativeMethods.CDIS_HOT) != 0) ||
                                   ((itemState & NativeMethods.CDIS_FOCUS) != 0)) 
                                   state |= STATE_HOT;
                                if ((itemState & NativeMethods.CDIS_SELECTED) != 0)
                                   state |= STATE_SELECTED;
 
                                DrawTreeItem(itemNode.Text, itemNode.ImageIndex,
                                         nmtvcd.nmcd.hdc, nmtvcd.nmcd.rc, 
                                         state, ColorTranslator.ToWin32(SystemColors.Control), ColorTranslator.ToWin32(SystemColors.ControlText)); 
                            }
                            m.Result = (IntPtr)NativeMethods.CDRF_SKIPDEFAULT; 

                        }
                        break;
                    case NativeMethods.CDDS_POSTPAINT: 
                        m.Result = (IntPtr)NativeMethods.CDRF_SKIPDEFAULT;
                        break; 
                    default: 
                        m.Result = (IntPtr)NativeMethods.CDRF_DODEFAULT;
                        break; 
                }
            }

            protected override void OnHandleDestroyed(EventArgs e) { 
                base.OnHandleDestroyed(e);
 
                if (!RecreatingHandle && (hbrushDither != IntPtr.Zero)) { 
                    SafeNativeMethods.DeleteObject(new HandleRef(this, hbrushDither));
                    hbrushDither = IntPtr.Zero; 
                }
            }

            private void FillRectDither(IntPtr dc, NativeMethods.RECT rc) { 
                IntPtr hbrushOld = SafeNativeMethods.SelectObject(new HandleRef(null, dc), new HandleRef(this, hbrushDither));
 
                if (hbrushOld != IntPtr.Zero) { 
                    int oldTextColor, oldBackColor;
 
                    oldTextColor = SafeNativeMethods.SetTextColor(new HandleRef(null, dc), ColorTranslator.ToWin32(SystemColors.ControlLightLight));
                    oldBackColor = SafeNativeMethods.SetBkColor(new HandleRef(null, dc), ColorTranslator.ToWin32(SystemColors.Control));

                    SafeNativeMethods.PatBlt(new HandleRef(null, dc), rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, NativeMethods.PATCOPY); 
                    SafeNativeMethods.SetTextColor(new HandleRef(null, dc), oldTextColor);
                    SafeNativeMethods.SetBkColor(new HandleRef(null, dc), oldBackColor); 
                } 
            }
 
            [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.UnmanagedCode)]
            protected override void WndProc(ref Message m) {
                if (m.Msg == NativeMethods.WM_REFLECT + NativeMethods.WM_NOTIFY) {
                    NativeMethods.NMHDR nmh = (NativeMethods.NMHDR)m.GetLParam(typeof(NativeMethods.NMHDR)); 
                    if (nmh.code == NativeMethods.NM_CUSTOMDRAW) {
                        OnCustomDraw(ref m); 
                        return; 
                    }
                } 

                base.WndProc(ref m);
            }
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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