Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Framework / System / Windows / Controls / SoundPlayerAction.cs / 1 / SoundPlayerAction.cs
/****************************************************************************\ * * File: SoundPlayerAction.cs * * A SoundPlayerAction causes a sound to be played in response to a trigger. * * Copyright (C) by Microsoft Corporation. All rights reserved. * \***************************************************************************/ using MS.Internal; using MS.Internal.PresentationFramework; using MS.Utility; using System; using System.Collections; using System.ComponentModel; // DefaultValueAttribute using System.IO; using System.IO.Packaging; using System.Media; using System.Net; using System.Windows; using System.Windows.Documents; using System.Windows.Markup; using System.Windows.Media; using System.Windows.Navigation; using System.Windows.Threading; using System.Diagnostics; using System.Runtime.InteropServices; using System.Runtime.Remoting; using System.Security; using System.Security.Permissions; namespace System.Windows.Controls { ////// A class that describes a sound playback action to perform for a trigger /// [RuntimeNameProperty("Name")] // Enables INameScope.FindName to find SoundPlayerAction objects. public class SoundPlayerAction : TriggerAction, IDisposable { ////// Creates an instance of the SoundPlayerAction object. /// public SoundPlayerAction() : base() { } ////// Dispose. /// public void Dispose() { if (m_player != null) { m_player.Dispose(); } } ////// DependencyProperty for Source /// public static readonly DependencyProperty SourceProperty = DependencyProperty.Register( "Source", typeof(Uri), typeof(SoundPlayerAction), new FrameworkPropertyMetadata( new PropertyChangedCallback(OnSourceChanged))); ////// A class that describes a sound playback action to perform for a trigger /// public Uri Source { get { return (Uri)GetValue(SourceProperty); } set { SetValue(SourceProperty, value); } } private static void OnSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { SoundPlayerAction soundPlayerAction = (SoundPlayerAction)d; soundPlayerAction.OnSourceChangedHelper((Uri)e.NewValue); } // To avoid blocking the UI thread, SoundPlayerAction performs an asynchronous // download of the WebResponse and later, the response Stream. However, // PackWebRequest does not support the asynchonous Begin/EndGetResponse pattern. // To work around this, we use our own asynchronous worker pool thread, // and then use the regular synchronous WebRequest.GetResponse() method. // Once we obtain the WebResponse, we will use SoundPlayer's async API // to download the content of the stream. private void OnSourceChangedHelper(Uri newValue) { if (newValue == null || newValue.IsAbsoluteUri) { m_lastRequestedAbsoluteUri = newValue; } else { // When we are given a relative Uri path, expand to an absolute Uri by resolving // it against the Application's base Uri. This would typically return a Pack Uri. m_lastRequestedAbsoluteUri = BaseUriHelper.GetResolvedUri(BaseUriHelper.BaseUri, newValue); } // Invalidate items that depend on the Source uri m_player = null; m_playRequested = false; // Suppress earlier requests to Play the sound if (m_streamLoadInProgress) { // There is already a worker thread downloading the previous URI stream, // or the SoundPlayer is copying the stream into its buffer. Make a note // that the URI has been changed and we will have to reload everything. m_uriChangedWhileLoadingStream = true; } else { BeginLoadStream(); } } ////// Invoke the SoundPlayer action. /// internal sealed override void Invoke(FrameworkElement el, FrameworkContentElement ctntEl, Style targetStyle, FrameworkTemplate targetTemplate, Int64 layer) { PlayWhenLoaded(); } ////// invoke the SoundPlayer action. /// internal sealed override void Invoke(FrameworkElement el) { PlayWhenLoaded(); } ////// Plays the /// private void PlayWhenLoaded() { if (m_streamLoadInProgress) { m_playRequested = true; } else if (m_player != null) { // If the Player has not yet loaded, m_streamLoadInProgress must be true Debug.Assert(m_player.IsLoadCompleted); m_player.Play(); } } private void BeginLoadStream() { if (m_lastRequestedAbsoluteUri != null) // Only reload if the new source is non-null { m_streamLoadInProgress = true; // Step 1: Perform an asynchronous load of the WebResponse and its associated Stream LoadStreamCaller downloadStreamCaller = new LoadStreamCaller(LoadStreamAsync); IAsyncResult asyncResult = downloadStreamCaller.BeginInvoke(m_lastRequestedAbsoluteUri, new AsyncCallback(LoadStreamCallback), downloadStreamCaller); } } private delegate Stream LoadStreamCaller(Uri uri); ////// This is the actual code that runs in our worker thread. /// private Stream LoadStreamAsync(Uri uri) { return WpfWebRequestHelper.CreateRequestAndGetResponseStream(uri); } ////// This code runs in the worker thread when LoadStreamAsync() finishes. /// /// private void LoadStreamCallback(IAsyncResult asyncResult) { // Now have the UI thread regain control and initialize the SoundPlayer DispatcherOperationCallback loadStreamCompletedCaller = new DispatcherOperationCallback(OnLoadStreamCompleted); Dispatcher.BeginInvoke(DispatcherPriority.Normal, loadStreamCompletedCaller, asyncResult); } ////// Called on the UI thread when the Stream object is initialized. /// Begins asynchronous download of the Stream content into SoundPlayer's local buffer. /// private Object OnLoadStreamCompleted(Object asyncResultArg) { // Necessary for proper cleanup of async resources IAsyncResult asyncResult = (IAsyncResult)asyncResultArg; LoadStreamCaller caller = (LoadStreamCaller)asyncResult.AsyncState; Stream newStream = caller.EndInvoke(asyncResult); if (m_uriChangedWhileLoadingStream) // The source URI was changed, redo Stream loading { m_uriChangedWhileLoadingStream = false; if (newStream != null) // Don't hold on to the new stream - it's not needed anymore { newStream.Dispose(); } BeginLoadStream(); } else if (newStream != null) // We loaded the Stream, begin buffering it { if (m_player == null) { m_player = new SoundPlayer((Stream)newStream); } else { m_player.Stream = (Stream)newStream; } m_player.LoadCompleted += new AsyncCompletedEventHandler(OnSoundPlayerLoadCompleted); m_player.LoadAsync(); // Begin preloading the stream into SoundPlayer's local buffer } return null; } private void OnSoundPlayerLoadCompleted(Object sender, AsyncCompletedEventArgs e) { Debug.Assert(Object.ReferenceEquals(m_player, sender)); Debug.Assert(m_player.IsLoadCompleted); if (m_uriChangedWhileLoadingStream) // The source URI was changed, redo Stream loading again { m_player = null; m_uriChangedWhileLoadingStream = false; BeginLoadStream(); } else { m_streamLoadInProgress = false; if (m_playRequested) // URI is correct, m_player is ready, play it if requested { m_playRequested = false; m_player.Play(); } } } private SoundPlayer m_player; private Uri m_lastRequestedAbsoluteUri; private bool m_streamLoadInProgress; private bool m_playRequested; private bool m_uriChangedWhileLoadingStream; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. /****************************************************************************\ * * File: SoundPlayerAction.cs * * A SoundPlayerAction causes a sound to be played in response to a trigger. * * Copyright (C) by Microsoft Corporation. All rights reserved. * \***************************************************************************/ using MS.Internal; using MS.Internal.PresentationFramework; using MS.Utility; using System; using System.Collections; using System.ComponentModel; // DefaultValueAttribute using System.IO; using System.IO.Packaging; using System.Media; using System.Net; using System.Windows; using System.Windows.Documents; using System.Windows.Markup; using System.Windows.Media; using System.Windows.Navigation; using System.Windows.Threading; using System.Diagnostics; using System.Runtime.InteropServices; using System.Runtime.Remoting; using System.Security; using System.Security.Permissions; namespace System.Windows.Controls { ////// A class that describes a sound playback action to perform for a trigger /// [RuntimeNameProperty("Name")] // Enables INameScope.FindName to find SoundPlayerAction objects. public class SoundPlayerAction : TriggerAction, IDisposable { ////// Creates an instance of the SoundPlayerAction object. /// public SoundPlayerAction() : base() { } ////// Dispose. /// public void Dispose() { if (m_player != null) { m_player.Dispose(); } } ////// DependencyProperty for Source /// public static readonly DependencyProperty SourceProperty = DependencyProperty.Register( "Source", typeof(Uri), typeof(SoundPlayerAction), new FrameworkPropertyMetadata( new PropertyChangedCallback(OnSourceChanged))); ////// A class that describes a sound playback action to perform for a trigger /// public Uri Source { get { return (Uri)GetValue(SourceProperty); } set { SetValue(SourceProperty, value); } } private static void OnSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { SoundPlayerAction soundPlayerAction = (SoundPlayerAction)d; soundPlayerAction.OnSourceChangedHelper((Uri)e.NewValue); } // To avoid blocking the UI thread, SoundPlayerAction performs an asynchronous // download of the WebResponse and later, the response Stream. However, // PackWebRequest does not support the asynchonous Begin/EndGetResponse pattern. // To work around this, we use our own asynchronous worker pool thread, // and then use the regular synchronous WebRequest.GetResponse() method. // Once we obtain the WebResponse, we will use SoundPlayer's async API // to download the content of the stream. private void OnSourceChangedHelper(Uri newValue) { if (newValue == null || newValue.IsAbsoluteUri) { m_lastRequestedAbsoluteUri = newValue; } else { // When we are given a relative Uri path, expand to an absolute Uri by resolving // it against the Application's base Uri. This would typically return a Pack Uri. m_lastRequestedAbsoluteUri = BaseUriHelper.GetResolvedUri(BaseUriHelper.BaseUri, newValue); } // Invalidate items that depend on the Source uri m_player = null; m_playRequested = false; // Suppress earlier requests to Play the sound if (m_streamLoadInProgress) { // There is already a worker thread downloading the previous URI stream, // or the SoundPlayer is copying the stream into its buffer. Make a note // that the URI has been changed and we will have to reload everything. m_uriChangedWhileLoadingStream = true; } else { BeginLoadStream(); } } ////// Invoke the SoundPlayer action. /// internal sealed override void Invoke(FrameworkElement el, FrameworkContentElement ctntEl, Style targetStyle, FrameworkTemplate targetTemplate, Int64 layer) { PlayWhenLoaded(); } ////// invoke the SoundPlayer action. /// internal sealed override void Invoke(FrameworkElement el) { PlayWhenLoaded(); } ////// Plays the /// private void PlayWhenLoaded() { if (m_streamLoadInProgress) { m_playRequested = true; } else if (m_player != null) { // If the Player has not yet loaded, m_streamLoadInProgress must be true Debug.Assert(m_player.IsLoadCompleted); m_player.Play(); } } private void BeginLoadStream() { if (m_lastRequestedAbsoluteUri != null) // Only reload if the new source is non-null { m_streamLoadInProgress = true; // Step 1: Perform an asynchronous load of the WebResponse and its associated Stream LoadStreamCaller downloadStreamCaller = new LoadStreamCaller(LoadStreamAsync); IAsyncResult asyncResult = downloadStreamCaller.BeginInvoke(m_lastRequestedAbsoluteUri, new AsyncCallback(LoadStreamCallback), downloadStreamCaller); } } private delegate Stream LoadStreamCaller(Uri uri); ////// This is the actual code that runs in our worker thread. /// private Stream LoadStreamAsync(Uri uri) { return WpfWebRequestHelper.CreateRequestAndGetResponseStream(uri); } ////// This code runs in the worker thread when LoadStreamAsync() finishes. /// /// private void LoadStreamCallback(IAsyncResult asyncResult) { // Now have the UI thread regain control and initialize the SoundPlayer DispatcherOperationCallback loadStreamCompletedCaller = new DispatcherOperationCallback(OnLoadStreamCompleted); Dispatcher.BeginInvoke(DispatcherPriority.Normal, loadStreamCompletedCaller, asyncResult); } ////// Called on the UI thread when the Stream object is initialized. /// Begins asynchronous download of the Stream content into SoundPlayer's local buffer. /// private Object OnLoadStreamCompleted(Object asyncResultArg) { // Necessary for proper cleanup of async resources IAsyncResult asyncResult = (IAsyncResult)asyncResultArg; LoadStreamCaller caller = (LoadStreamCaller)asyncResult.AsyncState; Stream newStream = caller.EndInvoke(asyncResult); if (m_uriChangedWhileLoadingStream) // The source URI was changed, redo Stream loading { m_uriChangedWhileLoadingStream = false; if (newStream != null) // Don't hold on to the new stream - it's not needed anymore { newStream.Dispose(); } BeginLoadStream(); } else if (newStream != null) // We loaded the Stream, begin buffering it { if (m_player == null) { m_player = new SoundPlayer((Stream)newStream); } else { m_player.Stream = (Stream)newStream; } m_player.LoadCompleted += new AsyncCompletedEventHandler(OnSoundPlayerLoadCompleted); m_player.LoadAsync(); // Begin preloading the stream into SoundPlayer's local buffer } return null; } private void OnSoundPlayerLoadCompleted(Object sender, AsyncCompletedEventArgs e) { Debug.Assert(Object.ReferenceEquals(m_player, sender)); Debug.Assert(m_player.IsLoadCompleted); if (m_uriChangedWhileLoadingStream) // The source URI was changed, redo Stream loading again { m_player = null; m_uriChangedWhileLoadingStream = false; BeginLoadStream(); } else { m_streamLoadInProgress = false; if (m_playRequested) // URI is correct, m_player is ready, play it if requested { m_playRequested = false; m_player.Play(); } } } private SoundPlayer m_player; private Uri m_lastRequestedAbsoluteUri; private bool m_streamLoadInProgress; private bool m_playRequested; private bool m_uriChangedWhileLoadingStream; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ScriptReference.cs
- MissingMethodException.cs
- ConfigurationManager.cs
- SQLSingleStorage.cs
- Normalization.cs
- SemanticKeyElement.cs
- GetMemberBinder.cs
- TabControlEvent.cs
- WebBrowserHelper.cs
- ToggleButton.cs
- RequestCachingSection.cs
- PaperSize.cs
- ExpressionHelper.cs
- HandlerBase.cs
- EntityClassGenerator.cs
- _OSSOCK.cs
- _SSPISessionCache.cs
- AppDomainFactory.cs
- TerminatorSinks.cs
- EncodingDataItem.cs
- XmlReader.cs
- SupportsPreviewControlAttribute.cs
- HtmlInputHidden.cs
- FixedNode.cs
- ReferentialConstraint.cs
- MaskedTextBoxDesigner.cs
- XmlSerializationReader.cs
- ConfigPathUtility.cs
- MD5CryptoServiceProvider.cs
- CodeTypeParameter.cs
- XmlProcessingInstruction.cs
- SqlBooleanizer.cs
- SyndicationDeserializer.cs
- MarshalByRefObject.cs
- login.cs
- MostlySingletonList.cs
- relpropertyhelper.cs
- AuthenticationManager.cs
- WebPartEventArgs.cs
- ApplicationManager.cs
- SqlDependencyUtils.cs
- ServerReliableChannelBinder.cs
- NotifyParentPropertyAttribute.cs
- RelatedImageListAttribute.cs
- BuildDependencySet.cs
- WebPartConnectionsConfigureVerb.cs
- DomainLiteralReader.cs
- CacheOutputQuery.cs
- XmlDownloadManager.cs
- PropertyNames.cs
- XamlInt32CollectionSerializer.cs
- OpenTypeLayoutCache.cs
- ImageBrush.cs
- DatePickerTextBox.cs
- x509utils.cs
- InheritanceRules.cs
- Pair.cs
- CodeCommentStatement.cs
- BevelBitmapEffect.cs
- sitestring.cs
- X509DefaultServiceCertificateElement.cs
- SecureUICommand.cs
- NavigationProperty.cs
- __Filters.cs
- WorkflowLayouts.cs
- TileModeValidation.cs
- Transform3DGroup.cs
- VectorAnimation.cs
- DataBindingHandlerAttribute.cs
- ContextProperty.cs
- ForAllOperator.cs
- OpenTypeCommon.cs
- TimelineCollection.cs
- WorkflowOwnershipException.cs
- ObjectParameterCollection.cs
- IdnElement.cs
- ScriptHandlerFactory.cs
- ServerReliableChannelBinder.cs
- KeyGesture.cs
- CodePageUtils.cs
- TextStore.cs
- LinkUtilities.cs
- StylusPointDescription.cs
- CodeAssignStatement.cs
- EventSinkHelperWriter.cs
- RotateTransform3D.cs
- XmlSchemaFacet.cs
- XmlReflectionImporter.cs
- DataGridViewSelectedRowCollection.cs
- UpdateProgress.cs
- RemoteWebConfigurationHostStream.cs
- AssemblyHash.cs
- ContentDefinition.cs
- MessageSmuggler.cs
- Deflater.cs
- MultiBinding.cs
- MessageAction.cs
- MetaType.cs
- NamespaceMapping.cs
- NumericUpDownAccelerationCollection.cs