HtmlShimManager.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / HtmlShimManager.cs / 1 / HtmlShimManager.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

 
namespace System.Windows.Forms { 

    using System; 
    using System.Collections.Generic;
    using System.Collections;
    using System.Diagnostics;
 
    /// 
    ///  HtmlShimManager - this class manages the shims for HtmlWindows, HtmlDocuments, and HtmlElements. 
    ///  essentially we need a long-lasting object to call back on events from the web browser, and the 
    ///  manager is the one in charge of making sure this list stays around as long as needed.
    /// 
    ///  When a HtmlWindow unloads we prune our list of corresponding document, window, and element shims.
    ///
    /// 
    internal sealed class HtmlShimManager :IDisposable { 

            private Dictionary htmlWindowShims; 
            private Dictionary htmlElementShims; 
            private Dictionary htmlDocumentShims;
 
            internal HtmlShimManager() {
            }

            ///  AddDocumentShim - adds a HtmlDocumentShim to list of shims to manage 
            ///   Can create a WindowShim as a side effect so it knows when to self prune from the list.
            /// 
            public void AddDocumentShim(HtmlDocument doc) { 
               HtmlDocument.HtmlDocumentShim shim = null;
 
               if (htmlDocumentShims == null) {
                   htmlDocumentShims = new Dictionary();
                   shim = new HtmlDocument.HtmlDocumentShim(doc);
                   htmlDocumentShims[doc] = shim; 
               }
               else if (!htmlDocumentShims.ContainsKey(doc)) { 
                   shim = new HtmlDocument.HtmlDocumentShim(doc); 
                   htmlDocumentShims[doc] = shim;
               } 
               if (shim != null) {
                   OnShimAdded(shim);
               }
 
           }
 
            ///  AddWindowShim - adds a HtmlWindowShim to list of shims to manage 
            ///
 
            public void AddWindowShim(HtmlWindow window) {
                HtmlWindow.HtmlWindowShim shim = null;
                if (htmlWindowShims == null) {
                    htmlWindowShims = new Dictionary(); 
                    shim = new HtmlWindow.HtmlWindowShim(window);
                    htmlWindowShims[window] = shim; 
                } 
                else if (!htmlWindowShims.ContainsKey(window)) {
                    shim = new HtmlWindow.HtmlWindowShim(window); 
                    htmlWindowShims[window] = shim;
                }
                if (shim != null) {
                   // strictly not necessary, but here for future use. 
                   OnShimAdded(shim);
                } 
            } 

            ///  AddElementShim - adds a HtmlDocumentShim to list of shims to manage 
            ///   Can create a WindowShim as a side effect so it knows when to self prune from the list.
            ///
            public void AddElementShim(HtmlElement element) {
                HtmlElement.HtmlElementShim shim = null; 

                if (htmlElementShims == null) { 
                    htmlElementShims = new Dictionary(); 
                    shim = new HtmlElement.HtmlElementShim(element);
                    htmlElementShims[element] = shim; 
                }
                else if (!htmlElementShims.ContainsKey(element)) {
                    shim = new HtmlElement.HtmlElementShim(element);
                    htmlElementShims[element] = shim; 
                }
                if (shim != null) { 
                   OnShimAdded(shim); 
                }
 
            }

            internal HtmlDocument.HtmlDocumentShim GetDocumentShim(HtmlDocument document) {
                if (htmlDocumentShims == null) { 
                    return null;
                } 
                if (htmlDocumentShims.ContainsKey(document)) { 
                    return htmlDocumentShims[document];
                } 
                return null;
            }

            internal HtmlElement.HtmlElementShim GetElementShim(HtmlElement element) { 
                if (htmlElementShims == null) {
                    return null; 
                } 
                if (htmlElementShims.ContainsKey(element)) {
                    return htmlElementShims[element]; 
                }
                return null;
            }
 
            internal HtmlWindow.HtmlWindowShim GetWindowShim(HtmlWindow window) {
               if (htmlWindowShims == null) { 
                    return null; 
                }
                if (htmlWindowShims.ContainsKey(window)) { 
                    return htmlWindowShims[window];
                }
                return null;
            } 

            private void OnShimAdded(HtmlShim addedShim) { 
 
                Debug.Assert(addedShim != null, "Why are we calling this with a null shim?");
                if (addedShim != null) { 
                    if (!(addedShim is HtmlWindow.HtmlWindowShim)) {
                        // we need to add a window shim here for documents and elements
                        // so we can sync Window.Unload.  The window shim itself will trap
                        // the unload event and call back on us on OnWindowUnloaded.  When 
                        // that happens we know we can free all our ptrs to COM.
                        AddWindowShim(new HtmlWindow(this, addedShim.AssociatedWindow)); 
                    } 
                }
            } 
            /// 
            /// HtmlWindowShim calls back on us when it has unloaded the page.  At this point we need to
            /// walk through our lists and make sure we've cleaned up
            ///  
            internal void OnWindowUnloaded(HtmlWindow unloadedWindow) {
                Debug.Assert(unloadedWindow != null, "Why are we calling this with a null window?"); 
                if (unloadedWindow != null) { 
                    //
                    // prune documents 
                    //
                    if (htmlDocumentShims != null) {
                        HtmlDocument.HtmlDocumentShim[] shims = new HtmlDocument.HtmlDocumentShim[htmlDocumentShims.Count];
                        htmlDocumentShims.Values.CopyTo(shims,0); 

                        foreach (HtmlDocument.HtmlDocumentShim shim in shims) { 
                            if (shim.AssociatedWindow == unloadedWindow.NativeHtmlWindow) { 
                                htmlDocumentShims.Remove(shim.Document);
                                shim.Dispose(); 
                            }
                        }
                    }
                    // 
                    // prune elements
                    // 
                    if (htmlElementShims != null) { 
                        HtmlElement.HtmlElementShim[] shims = new HtmlElement.HtmlElementShim[htmlElementShims.Count];
                        htmlElementShims.Values.CopyTo(shims,0); 

                        foreach (HtmlElement.HtmlElementShim shim in shims) {
                            if (shim.AssociatedWindow == unloadedWindow.NativeHtmlWindow) {
                                htmlElementShims.Remove(shim.Element); 
                                shim.Dispose();
                            } 
                        } 
                    }
 
                    //
                    // prune the particular window from the list.
                    //
                    if (htmlWindowShims != null) { 
                         if (htmlWindowShims.ContainsKey(unloadedWindow)) {
                            HtmlWindow.HtmlWindowShim shim = htmlWindowShims[unloadedWindow]; 
                            htmlWindowShims.Remove(unloadedWindow); 
                            shim.Dispose();
                         } 
                    }
                }
            }
 
            public void Dispose() {
                 Dispose(true); 
            } 

            private void Dispose(bool disposing) { 
                if (disposing) {

                    if (htmlElementShims != null){
                        foreach (HtmlElement.HtmlElementShim shim in htmlElementShims.Values) { 
                            shim.Dispose();
                        } 
                    } 
                    if (htmlDocumentShims != null) {
                        foreach (HtmlDocument.HtmlDocumentShim shim in htmlDocumentShims.Values) { 
                            shim.Dispose();
                        }
                    }
 
                    if (htmlWindowShims != null) {
                        foreach (HtmlWindow.HtmlWindowShim shim in htmlWindowShims.Values) { 
                            shim.Dispose(); 
                        }
                    } 
                    htmlWindowShims = null;
                    htmlDocumentShims = null;
                    htmlWindowShims = null;
 

                } 
            } 
            ~HtmlShimManager() {
                Dispose(false); 
            }


 
     }
 } 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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HtmlShimManager.cs source code in C# .NET

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