Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / Microsoft / Win32 / CommonDialog.cs / 1305600 / CommonDialog.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // CommonDialog is a base class representing common dialogs. // At this time, we intend it only to be used as a parent class // for the FileDialog class, although it could be used to implement // other commdlg.dll dialogs in the future. It is not a // general-purpose dialog class - it's specific to Win32 common // dialogs. // // // History: // t-benja 7/7/2005 Created // //--------------------------------------------------------------------------- namespace Microsoft.Win32 { using System; using System.Runtime.InteropServices; using System.Runtime.Remoting; using System.Security; using System.Security.Permissions; using System.Threading; using System.Windows; using System.Windows.Interop; using MS.Internal.Interop; using MS.Internal.PresentationFramework; using MS.Win32; ////// An abstract base class for displaying common dialogs. /// ////// InheritanceDemand for UIPermission (UIPermissionWindow.AllWindows) /// ////// We Don't want arbitrary Partially trusted code deriving from CommonDialog. /// InheritanceDemand for UIPermission (UIPermissionWindow.AllWindows) /// [UIPermission(SecurityAction.InheritanceDemand, Window = UIPermissionWindow.AllWindows)] public abstract class CommonDialog { //--------------------------------------------------- // // Constructors // //--------------------------------------------------- //#region Constructors //#endregion Constructors //---------------------------------------------------- // // Public Methods // //--------------------------------------------------- #region Public Methods ////// When overridden in a derived class, resets the properties /// of a common dialog to their default values. /// ////// Critical: Changes Dialog options /// PublicOk: This method is abstract, and there is an InheritanceDemand for /// UIPermission (UIPermissionWindow.AllWindows) to derive from CommonDialog. /// [SecurityCritical] public abstract void Reset(); ////// This is the public method that will be called to actually show /// a common dialog. Since CommonDialog is abstract, this function /// performs initialization tasks for all common dialogs and then /// calls RunDialog. /// ////// Callers must have UIPermission(UIPermissionWindow.AllWindows) to call this API. /// ////// Critical: Calls RunDialog, and accesses parking window hwnd from Application. /// Calls critical methods ComponentDispatcher.CriticalPushModal/CriticalPopModal. /// PublicOk: Demands Permission appropriate to the dialog (defaults to UIPermissionWindow.AllWindows) /// [SecurityCritical] public virtual NullableShowDialog() { CheckPermissionsToShowDialog(); // Don't allow file dialogs to be shown if not in interactive mode // (for example, if we're running as a service) if (!Environment.UserInteractive) { throw new InvalidOperationException(SR.Get(SRID.CantShowModalOnNonInteractive)); } // Call GetActiveWindow to retrieve the window handle to the active window // attached to the calling thread's message queue. We'll set the owner of // the common dialog to this handle. IntPtr hwndOwner = UnsafeNativeMethods.GetActiveWindow(); if (hwndOwner == IntPtr.Zero) { // No active window, so we'll use the parking window as the owner, // if its available. if (Application.Current != null) { hwndOwner = Application.Current.ParkingHwnd; } } HwndWrapper tempParentHwnd = null; try { // No active window and application wasn't available or didn't have // a ParkingHwnd, we create a hidden parent window for the dialog to // prevent breaking UIAutomation. if (hwndOwner == IntPtr.Zero) { tempParentHwnd = new HwndWrapper(0, 0, 0, 0, 0, 0, 0, "", IntPtr.Zero, null); hwndOwner = tempParentHwnd.Handle; } // Store the handle of the owner window inside our class so we can use it // to center the dialog later. _hwndOwnerWindow = hwndOwner; // Signal that this thread is going to go modal. try { ComponentDispatcher.CriticalPushModal(); return RunDialog(hwndOwner); } finally { ComponentDispatcher.CriticalPopModal(); } } finally { if (tempParentHwnd != null) { tempParentHwnd.Dispose(); } } } /// /// Runs a common dialog box, with the owner as the given Window /// ////// Callers must have UIPermission(UIPermissionWindow.AllWindows) to call this API. /// ////// Critical: Calls RunDialog and accesses owner handle and parking window hwnd from Application. /// Calls critical methods ComponentDispatcher.CriticalPushModal/CriticalPopModal. /// PublicOk: Demands UIPermission (UIPermissionWindow.AllWindows) /// [SecurityCritical] public NullableShowDialog(Window owner) { CheckPermissionsToShowDialog(); // If a valid window wasn't passed into this function, we'll // call ShowDialog() to use the active window instead of // throwing an exception if (owner == null) { return ShowDialog(); } // Don't allow file dialogs to be shown if not in interactive mode // (for example, if we're running as a service) if (!Environment.UserInteractive) { throw new InvalidOperationException(SR.Get(SRID.CantShowModalOnNonInteractive)); } // Get the handle of the owner window using WindowInteropHelper. IntPtr hwndOwner = (new WindowInteropHelper(owner)).CriticalHandle; // Just in case, check if the window's handle is zero. if (hwndOwner == IntPtr.Zero) { // CODE throw new InvalidOperationException(); } // Store the handle of the owner window inside our class so we can use it // to center the dialog later. _hwndOwnerWindow = hwndOwner; // Signal that this thread is going to go modal. try { ComponentDispatcher.CriticalPushModal(); return RunDialog(hwndOwner); } finally { ComponentDispatcher.CriticalPopModal(); } } #endregion Public Methods //---------------------------------------------------- // // Public Properties // //---------------------------------------------------- #region Public Properties /// /// Provides the ability to attach an arbitrary object to the dialog. /// public object Tag { get { return _userData; } set { _userData = value; } } #endregion Public Properties //--------------------------------------------------- // // Public Events // //---------------------------------------------------- //#region Public Events //#endregion Public Events //--------------------------------------------------- // // Protected Methods // //--------------------------------------------------- #region Protected Methods ////// Defines the common dialog box hook procedure that is overridden to /// add specific functionality to a common dialog box. /// ////// Critical: Calls UnsafeNativeMethods.SetFocus() and UnsafeNativeMethods.PostMessage() /// [SecurityCritical] protected virtual IntPtr HookProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam) { // WM_INITDIALOG // The WM_INITDIALOG message is sent to the dialog box procedure immediately // before a dialog box is displayed. Dialog box procedures typically use // this message to initialize controls and carry out any other initialization // tasks that affect the appearance of the dialog box. // // We handle WM_INITDIALOG to move the dialog to the center of the screen if ((WindowMessage)msg == WindowMessage.WM_INITDIALOG) { // call MoveToScreenCenter to reposition the dialog based on the location // of the owner window. MoveToScreenCenter(new HandleRef(this,hwnd)); // WM_INITDIALOG expects TRUE to be returned to properly set focus. return new IntPtr(1); } return IntPtr.Zero; } ////// When overridden in a derived class, displays a particular type of common dialog box. /// protected abstract bool RunDialog(IntPtr hwndOwner); ////// Demands permissions appropriate to the dialog to be shown. /// [SecurityCritical, SecurityTreatAsSafe] protected virtual void CheckPermissionsToShowDialog() { // Verify we're on the right thread. // This mitigates multi-threaded attacks without having to make the file dialogs thread-safe. if (_thread != Thread.CurrentThread) { throw new InvalidOperationException(SR.Get(SRID.CantShowOnDifferentThread)); } SecurityHelper.DemandUIWindowPermission(); } #endregion Protected Methods //--------------------------------------------------- // // Internal Methods // //---------------------------------------------------- #region Internal Methods ////// Centers the given window on the screen. This method is used by HookProc /// to center the dialog on the screen before it is shown. We can't mark it /// private because we need to call it from our derived classes like /// FileDialog. /// ////// Critical: Calls UnsafeNativeMethods.SetWindowPos() /// [SecurityCritical] internal void MoveToScreenCenter(HandleRef hWnd) { // Create an IntPtr to store a handle to the monitor. IntPtr hMonitor = IntPtr.Zero; // Get the monitor to use based on the location of the parent window if (_hwndOwnerWindow != IntPtr.Zero) { // we have a owner hwnd; center on the screen on // which our owner hwnd is. // We use MONITOR_DEFAULTTONEAREST to get the monitor // nearest to the window if the window doesn't intersect // any display monitor. hMonitor = SafeNativeMethods.MonitorFromWindow( new HandleRef(this, _hwndOwnerWindow), // window to find monitor location for NativeMethods.MONITOR_DEFAULTTONEAREST); // get the monitor nearest to the window // Only move the window if we got a valid monitor... otherwise let Windows // position the dialog. if (hMonitor != IntPtr.Zero) { // Now, create another RECT and fill it with the bounds of the parent window. NativeMethods.RECT dialogRect = new NativeMethods.RECT(); SafeNativeMethods.GetWindowRect(hWnd, ref dialogRect); Size dialogSize = new Size((dialogRect.right - dialogRect.left), /*width*/ (dialogRect.bottom - dialogRect.top)); /*height*/ // create variables that will receive the new position of the dialog double x = 0; double y = 0; // Call into a static function in System.Windows.Window to calculate // the actual new position Window.CalculateCenterScreenPosition( hMonitor, dialogSize, ref x, ref y); // Call SetWindowPos to actually move the window. UnsafeNativeMethods.SetWindowPos(hWnd, // handle to the window to move NativeMethods.NullHandleRef, // window to precede this one in zorder (int)Math.Round(x), (int)Math.Round(y), // new X and Y positions 0, 0, // new width and height, if applicable // Flags: // SWP_NOSIZE: Retains current size // SWP_NOZORDER: retains current zorder // SWP_NOACTIVATE: does not activate the window NativeMethods.SWP_NOSIZE | NativeMethods.SWP_NOZORDER | NativeMethods.SWP_NOACTIVATE); } } } #endregion Internal Methods //--------------------------------------------------- // // Internal Properties // //---------------------------------------------------- #region Internal Properties #endregion Internal Properties //---------------------------------------------------- // // Internal Events // //--------------------------------------------------- //#region Internal Events //#endregion Internal Events //---------------------------------------------------- // // Private Methods // //--------------------------------------------------- //#region Private Methods //#endregion Private Methods //--------------------------------------------------- // // Protected Properties // //--------------------------------------------------- //#region Protected Properties //#endregion Protected Properties //---------------------------------------------------- // // Private Fields // //--------------------------------------------------- #region Private Fields // Private variable used to store data for the Tag property private object _userData; private Thread _thread = Thread.CurrentThread; ////// The owner hwnd passed into the dialog is stored as a private /// member so that the dialog can be properly centered onscreen. /// It is exposed through the OwnerWindowHandle property. /// ////// Critical: hWnds are critical data. /// [SecurityCritical] private IntPtr _hwndOwnerWindow; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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