Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Interop / BrowserInteropHelper.cs / 1 / BrowserInteropHelper.cs
//---------------------------------------------------------------------------- // // File: BrowserInteropHelper.cs // // Description: Implements Avalon BrowserInteropHelper class, which helps // interop with the browser // // Created: 08/02/05 // // Copyright (C) by Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System; using System.Runtime.InteropServices; using System.Windows; using System.Windows.Interop; using System.Windows.Threading; using System.Security; using System.Security.Permissions; using System.Diagnostics; using MS.Internal; using MS.Internal.PresentationFramework; // SecurityHelper using MS.Win32; using System.Windows.Input; using MS.Internal.AppModel; namespace System.Windows.Interop { ////// Implements Avalon BrowserInteropHelper, which helps interop with the browser /// public static class BrowserInteropHelper { ////// Critical because it sets critical data. /// Safe because it is the static ctor, and the data doesn't go anywhere. /// [SecurityCritical, SecurityTreatAsSafe] static BrowserInteropHelper() { SetBrowserHosted(false); IsViewer = false; IsInitialViewerNavigation = true; } ////// Returns the IOleClientSite interface /// ////// Callers must have UnmanagedCode permission to call this API. /// ////// Critical: Exposes a COM interface pointer to the IOleClientSite where the app is hosted /// PublicOK: It is public, but there is a demand /// public static object ClientSite { [SecurityCritical] get { SecurityHelper.DemandUnmanagedCode(); object oleClientSite = null; if (IsBrowserHosted) { Application.Current.BrowserCallbackServices.GetOleClientSite(out oleClientSite); } return oleClientSite; } } ////// Returns true if the app is a browser hosted app. /// public static bool IsBrowserHosted { get { return _isBrowserHosted.Value; } } ////// This is critical because setting the BrowserHosted status is a critical resource. /// [SecurityCritical] internal static void SetBrowserHosted(bool value) { _isBrowserHosted.Value = value; } ////// Returns the Uri used to launch the application. /// public static Uri Source { get { return _source.Value; } } ////// Sets the Source URI /// ////// Critical: critical because setting the source is critical. /// [SecurityCritical] internal static void SetSource(Uri source) { _source.Value = source; } ////// Returns true if the app is a viewer app. /// ////// Critical: critical because setting the viewer status is a critical resource. /// internal static bool IsViewer { get { return _isViewer.Value; } [SecurityCritical] set { _isViewer.Value = value; } } ////// Returns true if avalon it top level. /// Also returns true if not browser-hosted. /// ////// Critical: Calls the SUCd IBrowserCallbackServices.IsAvalonTopLevel(). /// Safe: This is okay to dislose. /// internal static bool IsAvalonTopLevel { [SecurityCritical, SecurityTreatAsSafe] get { if (!IsBrowserHosted) return true; IBrowserCallbackServices bcs = Application.Current.BrowserCallbackServices; return bcs != null && bcs.IsAvalonTopLevel(); } } ////// Returns true if we are in viewer mode AND this is the first time that a viewer has been navigated. /// Including IsViewer is defense-in-depth in case somebody forgets to check IsViewer. There are other /// reasons why both IsViewer and IsViewerNavigation are necessary, however. /// ////// Critical: setting this information is a critical resource. /// internal static bool IsInitialViewerNavigation { get { return IsViewer && _isInitialViewerNavigation.Value; } [SecurityCritical] set { _isInitialViewerNavigation.Value = value; } } ////// Critical: this calls ForwardTranslateAccelerator, which is SUC'ed. /// [SecurityCritical] private static void HostFilterInput(ref MSG msg, ref bool handled) { // The host gets to see input, keyboard and mouse messages. if (msg.message == MS.Win32.NativeMethods.WM_INPUT || (msg.message >= MS.Win32.NativeMethods.WM_KEYFIRST && msg.message <= MS.Win32.NativeMethods.WM_IME_KEYLAST) || (msg.message >= MS.Win32.NativeMethods.WM_MOUSEFIRST && msg.message <= MS.Win32.NativeMethods.WM_MOUSELAST)) { if (MS.Win32.NativeMethods.S_OK == ForwardTranslateAccelerator(ref msg, false)) { handled = true; } } } ///This hook gets a "last chance" to handle a key. Such applicaton-unhandled /// keys are forwarded to the browser frame. /// ////// Critical: this calls ForwardTranslateAccelerator, which is SUC'ed. /// [SecurityCritical] internal static IntPtr PostFilterInput(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { if (!handled) { if (msg >= MS.Win32.NativeMethods.WM_KEYFIRST && msg <= MS.Win32.NativeMethods.WM_IME_KEYLAST) { MSG m = new MSG(hwnd, msg, wParam, lParam, SafeNativeMethods.GetMessageTime(), 0, 0); if (MS.Win32.NativeMethods.S_OK == ForwardTranslateAccelerator(ref m, true)) { handled = true; } } } return IntPtr.Zero; } ////// Critical: this attaches an event to ThreadFilterMessage, which requires an assert /// Safe: doesn't expose anything, just does some internal plumbing stuff /// [SecurityCritical, SecurityTreatAsSafe] internal static void InitializeHostFilterInput() { (new UIPermission(PermissionState.Unrestricted)).Assert(); // Blessed assert try { ComponentDispatcher.ThreadFilterMessage += new ThreadMessageEventHandler(HostFilterInput); } finally { UIPermission.RevertAssert(); } } private static SecurityCriticalDataForSet_isBrowserHosted; private static SecurityCriticalDataForSet _isViewer; private static SecurityCriticalDataForSet _isInitialViewerNavigation; private static SecurityCriticalDataForSet _source; /// /// Critical - call is SUC'ed /// [SecurityCritical, SuppressUnmanagedCodeSecurity] [DllImport("PresentationHostDLL.dll", EntryPoint = "ForwardTranslateAccelerator")] private static extern int ForwardTranslateAccelerator(ref MSG pMsg, bool appUnhandled); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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