Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / mediaclock.cs / 2 / mediaclock.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, 2003 // // File: mediaclock.cs // //----------------------------------------------------------------------------- using System; using System.Diagnostics; using System.ComponentModel; using MS.Internal; using MS.Win32; using System.Windows.Media.Animation; using System.Windows.Media; using System.Windows.Media.Composition; using System.Windows.Markup; using System.Security.Permissions; using System.Security; using MS.Internal.PresentationCore; // SecurityHelper using System.Windows.Threading; using System.Runtime.InteropServices; using System.IO; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; using UnsafeNativeMethods=MS.Win32.PresentationCore.UnsafeNativeMethods; namespace System.Windows.Media { #region MediaClock ////// Maintains run-time timing state for media (audio/video) objects. /// public class MediaClock : Clock { #region Constructors and Finalizers ////// Creates a MediaClock object. /// /// /// The MediaTimeline to use as a template. /// ////// The returned MediaClock doesn't have any children. /// protected internal MediaClock(MediaTimeline media) : base(media) {} #endregion #region Properties ////// Gets the MediaTimeline object that holds the description controlling the /// behavior of this clock. /// ////// The MediaTimeline object that holds the description controlling the /// behavior of this clock. /// public new MediaTimeline Timeline { get { return (MediaTimeline)base.Timeline; } } #endregion #region Clock Overrides ////// Returns True because Media has the potential to slip. /// ///True protected override bool GetCanSlip() { return true; } ////// Get the actual media time for slip synchronization /// protected override TimeSpan GetCurrentTimeCore() { if (_mediaPlayer != null) { return _mediaPlayer.Position; } else // Otherwise use base implementation { return base.GetCurrentTimeCore(); } } ////// Called when we are stopped. This is the same as pausing and seeking /// to the beginning. /// protected override void Stopped() { // Only perform the operation if we're controlling a player if (_mediaPlayer != null) { _mediaPlayer.SetSpeedRatio(0); _mediaPlayer.SetPosition(TimeSpan.FromTicks(0)); } } ////// Called when our speed changes. A discontinuous time movement may or /// may not have occurred. /// protected override void SpeedChanged() { Sync(); } ////// Called when we have a discontinuous time movement, but no change in /// speed /// protected override void DiscontinuousTimeMovement() { Sync(); } private void Sync() { // Only perform the operation if we're controlling a player if (_mediaPlayer != null) { double? currentSpeedProperty = this.CurrentGlobalSpeed; double currentSpeedValue = currentSpeedProperty.HasValue ? currentSpeedProperty.Value : 0; TimeSpan? currentTimeProperty = this.CurrentTime; TimeSpan currentTimeValue = currentTimeProperty.HasValue ? currentTimeProperty.Value : TimeSpan.Zero; // If speed was potentially changed to 0, make sure we set media's speed to 0 (e.g. pause) before // setting the position to the target frame. Otherwise, the media's scrubbing mechanism would // not work correctly, because scrubbing requires media to be paused by the time it is seeked. if (currentSpeedValue == 0) { _mediaPlayer.SetSpeedRatio(currentSpeedValue); _mediaPlayer.SetPosition(currentTimeValue); } else { // In the case where speed != 0, we first want to set the position and then the speed. // This is because if we were previously paused, we want to be at the right position // before we begin to play. _mediaPlayer.SetPosition(currentTimeValue); _mediaPlayer.SetSpeedRatio(currentSpeedValue); } } } ////// Returns true if this timeline needs continuous frames. /// This is a hint that we should keep updating our time during the active period. /// ///internal override bool NeedsTicksWhenActive { get { return true; } } /// /// The instance of media that this clock is driving /// internal MediaPlayer Player { get { return _mediaPlayer; } set { MediaPlayer oldPlayer = _mediaPlayer; MediaPlayer newPlayer = value; // avoid inifite loops if (newPlayer != oldPlayer) { _mediaPlayer = newPlayer; // Disassociate the old player if (oldPlayer != null) { oldPlayer.Clock = null; } // Associate the new player if (newPlayer != null) { newPlayer.Clock = this; Uri baseUri = ((IUriContext)Timeline).BaseUri; Uri toPlay = null; // ignore pack URIs for now (see work items 45396 and 41636) if (baseUri != null && baseUri.Scheme != System.IO.Packaging.PackUriHelper.UriSchemePack && !Timeline.Source.IsAbsoluteUri) { toPlay = new Uri(baseUri, Timeline.Source); } else { // // defaults to app domain base if Timeline.Source is // relative // toPlay = Timeline.Source; } // we need to sync to the current state of the clock newPlayer.SetSource(toPlay); SpeedChanged(); } } } } #endregion #region Private Data members ////// MediaPlayer -- holds all the precious resource references /// private MediaPlayer _mediaPlayer; #endregion } #endregion }; // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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