public NumberLineCanvas()
{
Background = Brushes.White;
_lineImage = new Image();
Children.Add(_lineImage);
_timestampConverter = new MillisecondsTimeConverterFormatter();
_shortLinePen = PenFactory.LinePen(Brushes.Black);
_longLinePen = PenFactory.LinePen(Brushes.Blue);
DataContextChanged += OnDataContextChanged;
}
public MainWindow()
{
var splashscreen = new SplashScreen("../Resources/Images/LiveDescribe-Splashscreen.png");
splashscreen.Show(true);
CustomResources.LoadResources();
if (!Defines.Debug)
System.Threading.Thread.Sleep(2000);
InitializeComponent();
//check which exporting options are available, depending on build
if (!Properties.Defines.Zagga)
{
ExportWithVideo.Visibility = Visibility.Collapsed;
ExportAudioOnly.Visibility = Visibility.Visible;
}
else
{
ExportWithVideo.Visibility = Visibility.Visible;
ExportAudioOnly.Visibility = Visibility.Collapsed;
}
Settings.Default.Upgrade();
Settings.Default.InitializeDefaultValuesIfNull();
_videoMedia = MediaControl.VideoMedia;
var mainWindowViewModel = new MainWindowViewModel(_videoMedia);
DataContext = mainWindowViewModel;
_mainWindowViewModel = mainWindowViewModel;
_mediaControlViewModel = mainWindowViewModel.MediaControlViewModel;
_projectManager = mainWindowViewModel.ProjectManager;
_descriptionInfoTabViewModel = mainWindowViewModel.DescriptionInfoTabViewModel;
_audioCanvas = AudioCanvasControl.AudioCanvas;
_audioCanvas.UndoRedoManager = mainWindowViewModel.UndoRedoManager;
_descriptionCanvas = DescriptionCanvasControl.DescriptionCanvas;
_descriptionCanvas.UndoRedoManager = mainWindowViewModel.UndoRedoManager;
_marker = MarkerControl.Marker;
_millisecondsTimeConverter = new MillisecondsTimeConverterFormatter();
SetRecentDocumentsList();
#region TimeLineScrollViewer Event Listeners
TimeLineScrollViewer.ScrollChanged += (sender, e) =>
{
DrawWaveForm();
AddLinesToNumberTimeLine();
};
#endregion
#region Event Listeners for VideoMedia
//if the videomedia's path changes (a video is added)
//then play and stop the video to load the video so the VideoOpenedRequest event gets fired
//this is done because the MediaElement does not load the video until it is played
//therefore you can't know the duration of the video or if it hasn't been loaded properly unless it fails
//I know this is a little hackish, but it's a consequence of how the MediaElement works
_videoMedia.PathChangedEvent += (sender, e) =>
{
_videoMedia.Play();
_videoMedia.Pause();
};
#endregion
#region Event Listeners For MainWindowViewModel (Pause, Play, Mute)
//These events are put inside the main control because they will also effect the list
//of audio descriptions an instance of DescriptionCollectionViewModel is inside the main control
//and the main control will take care of synchronizing the video, and the descriptions
//listens for PlayRequested Event
mainWindowViewModel.PlayRequested += (sender, e) => CommandManager.InvalidateRequerySuggested();
//listens for PauseRequested Event
mainWindowViewModel.PauseRequested += (sender, e) => CommandManager.InvalidateRequerySuggested();
//listens for when the media has gone all the way to the end
mainWindowViewModel.MediaEnded += (sender, e) =>
{
UpdateMarkerPosition(-MarkerOffset);
//this is to recheck all the graphics states
CommandManager.InvalidateRequerySuggested();
};
mainWindowViewModel.GraphicsTick += Play_Tick;
mainWindowViewModel.PlayingDescription += (sender, args) =>
{
try
{
if (args.Value.IsExtendedDescription)
DispatcherHelper.UIDispatcher.Invoke(() =>
SpaceAndDescriptionsTabControl.ExtendedDescriptionsListView.ScrollToCenterOfView(args.Value));
else
DispatcherHelper.UIDispatcher.Invoke(() =>
SpaceAndDescriptionsTabControl.DescriptionsListView.ScrollToCenterOfView(args.Value));
}
catch (Exception exception)
{
Log.Warn("Task Cancelled exception", exception);
}
};
#endregion
#region Event Listeners For MediaControlViewModel
//listens for VideoOpenedRequested event
//this event only gets thrown when if the MediaFailed event doesn't occur
//and as soon as the video is loaded when play is pressed
mainWindowViewModel.MediaControlViewModel.VideoOpenedRequested += (sender, e) =>
{
_videoDuration = _videoMedia.NaturalDuration.TimeSpan.TotalMilliseconds;
AudioCanvasControl.AudioCanvas.VideoDuration = _videoDuration;
DescriptionCanvasControl.DescriptionCanvas.VideoDuration = _videoDuration;
_canvasWidth = CalculateWidth();
_marker.IsEnabled = true;
//Video gets played and paused so you can seek initially when the video gets loaded
_videoMedia.Play();
_videoMedia.Pause();
SetTimeline();
foreach (var desc in _projectManager.AllDescriptions)
DrawDescribableInterval(desc);
foreach (var space in _projectManager.Spaces)
DrawDescribableInterval(space);
};
//captures the mouse when a mousedown request is sent to the Marker
mainWindowViewModel.MediaControlViewModel.OnMarkerMouseDownRequested += (sender, e) => _marker.CaptureMouse();
//updates the video position when the mouse is released on the Marker
mainWindowViewModel.MediaControlViewModel.OnMarkerMouseUpRequested += (sender, e) => _marker.ReleaseMouseCapture();
//updates the canvas and video position when the Marker is moved
mainWindowViewModel.MediaControlViewModel.OnMarkerMouseMoveRequested += (sender, e) =>
{
if (!_marker.IsMouseCaptured) return;
if (ScrollRightIfCanForGraphicsThread(Canvas.GetLeft(_marker)))
return;
if (ScrollLeftIfCanForGraphicsThread(Canvas.GetLeft(_marker)))
return;
var xPosition = Mouse.GetPosition(_audioCanvas).X;
var middleOfMarker = xPosition - MarkerOffset;
//make sure the middle of the marker doesn't go below the beginning of the canvas
if (xPosition < -MarkerOffset)
{
Canvas.SetLeft(_marker, -MarkerOffset);
UpdateVideoPosition(0);
return;
}
var newPositionInVideo = (xPosition / _canvasWidth) * _videoDuration;
if (newPositionInVideo >= _videoDuration)
{
var newPositionOfMarker = (_canvasWidth / _videoDuration) * (_videoDuration);
Canvas.SetLeft(_marker, newPositionOfMarker - MarkerOffset);
UpdateVideoPosition((int)(_videoDuration));
return;
}
Canvas.SetLeft(_marker, middleOfMarker);
UpdateVideoPosition((int)newPositionInVideo);
};
#endregion
#region Event Listeners For AudioCanvasViewModel
AudioCanvasViewModel audioCanvasViewModel = mainWindowViewModel.AudioCanvasViewModel;
audioCanvasViewModel.AudioCanvasMouseDownEvent += AudioCanvas_OnMouseDown;
audioCanvasViewModel.AudioCanvasMouseRightButtonDownEvent += AudioCanvas_RecordRightClickPosition;
_mainWindowViewModel.AudioCanvasViewModel.RequestSpaceTime += (sender, args) =>
{
var space = args.Value;
double middle = _rightClickPointOnAudioCanvas.X; // going to be the middle of the space
double middleTime = (_videoDuration / _audioCanvas.Width) * middle; // middle of the space in milliseconds
double starttime = middleTime - (DefaultSpaceLengthInMilliSeconds / 2);
double endtime = middleTime + (DefaultSpaceLengthInMilliSeconds / 2);
//Bounds checking when creating a space
if (starttime >= 0 && endtime <= _videoDuration)
{
space.StartInVideo = starttime;
space.EndInVideo = endtime;
}
else if (starttime < 0 && endtime > _videoDuration)
{
space.StartInVideo = 0;
space.EndInVideo = _videoDuration;
}
else if (starttime < 0)
{
space.StartInVideo = 0;
space.EndInVideo = endtime;
}
else if (endtime > _videoDuration)
{
space.StartInVideo = starttime;
space.EndInVideo = _videoDuration;
}
};
#endregion
#region Event Listeners For DescriptionCanvasViewModel
DescriptionCanvasViewModel descriptionCanvasViewModel = mainWindowViewModel.DescriptionCanvasViewModel;
descriptionCanvasViewModel.DescriptionCanvasMouseDownEvent += DescriptionCanvas_MouseDown;
#endregion
#region Event Handlers for ProjectManager
//When a description is added, attach an event to the StartInVideo and EndInVideo properties
//so when those properties change it redraws them
_projectManager.AllDescriptions.CollectionChanged += (sender, e) =>
{
if (e.Action != NotifyCollectionChangedAction.Add)
return;
foreach (Description d in e.NewItems)
AddDescriptionEventHandlers(d);
};
_projectManager.Spaces.CollectionChanged += (sender, e) =>
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
foreach (Space space in e.NewItems)
AddSpaceEventHandlers(space);
}
};
_projectManager.ProjectLoaded += (sender, e) => SetTimeline();
_projectManager.ProjectClosed += (sender, e) =>
{
_audioCanvas.Children.Clear();
NumberTimeline.Children.Clear();
UpdateMarkerPosition(-MarkerOffset);
_marker.IsEnabled = false;
};
#endregion
#region Event Handlers for Settings
Settings.Default.RecentProjects.CollectionChanged += (sender, args) => SetRecentDocumentsList();
#endregion
}