DialogWindow.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / DialogWindow.cs / 1407647 / DialogWindow.cs
                        

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

namespace System.Activities.Presentation 
{
    using System.Windows; 
    using System.Activities.Presentation.View; 
    using System.Windows.Interop;
    using System.Windows.Input; 
    using System.ComponentModel;

    internal class DialogWindow : Window
    { 
        public static readonly DependencyProperty ContextProperty =
            DependencyProperty.Register("Context", 
            typeof(EditingContext), 
            typeof(DialogWindow));
 
        string helpKeyword = HelpKeywords.HomePage;

        public EditingContext Context
        { 
            get { return (EditingContext)GetValue(ContextProperty); }
            set { SetValue(ContextProperty, value); } 
        } 

        protected string HelpKeyword 
        {
            get
            {
                return this.helpKeyword; 
            }
            set 
            { 
                this.helpKeyword = value;
            } 
        }

        protected override void OnSourceInitialized(EventArgs e)
        { 
            base.OnSourceInitialized(e);
 
            this.HideMinMaxButton(); 
            this.ShowContextHelpButton();
            this.HideIcon(); 
            this.AddWindowsHook(OnHookedWindowMessage);
            this.CommandBindings.Add(new CommandBinding(ApplicationCommands.Help, new ExecutedRoutedEventHandler(OnHelpExecuted)));
            this.Closing += new CancelEventHandler(OnWindowClosing);
        } 

        static IntPtr OnHookedWindowMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) 
        { 
            if (msg == Win32Interop.WM_SYSCOMMAND && wParam.ToInt64() == (long)Win32Interop.SC_CONTEXTHELP)
            { 
                var rootVisual = HwndSource.FromHwnd(hwnd).RootVisual;
                var focusedElement = FocusManager.GetFocusedElement(rootVisual);
                if (focusedElement == null)
                { 
                    focusedElement = rootVisual as IInputElement;
                } 
                ApplicationCommands.Help.Execute(null, focusedElement); 
                handled = true;
            } 

            // According to MSDN, zero should be returned after handling WM_SYSCOMMAND.
            // If this message is unhandled, it's still safe to return zero
            // because WPF framework (HwndSource) will return zero anyway if the 
            // message is unhandled.
            return IntPtr.Zero; 
        } 

        void OnWindowClosing(object sender, CancelEventArgs e) 
        {
            // Note: Do NOT remove the hook if the close operation needs to be canceled.
            this.RemoveWindowsHook(OnHookedWindowMessage);
        } 

        void OnHelpExecuted(Object sender, ExecutedRoutedEventArgs e) 
        { 
            if (this.Context != null)
            { 
                IIntegratedHelpService help = this.Context.Services.GetService();
                if (help != null)
                {
                    help.ShowHelpFromKeyword(this.helpKeyword); 
                    return;
                } 
            } 
            System.Diagnostics.Process.Start(SR.DefaultHelpUrl);
        } 
    }
}

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

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