/// <summary>
/// Write a class that implements the IDynamicAnimatedVisualSource interface.
/// </summary>
void WriteIDynamicAnimatedVisualSource(CodeBuilder builder, CodeGenInfo info)
{
var nodes = info.LoadedImageSurfaceNodes.ToArray();
builder.WriteLine("namespace AnimatedVisuals");
builder.OpenScope();
builder.WriteLine($"sealed class {info.ClassName} : IDynamicAnimatedVisualSource, INotifyPropertyChanged");
builder.OpenScope();
// Declare variables.
builder.WriteLine($"{_stringifier.Const(_stringifier.Int32TypeName)} c_loadedImageSurfaceCount = {nodes.Distinct().Count()};");
builder.WriteLine($"{_stringifier.Int32TypeName} _loadCompleteEventCount;");
builder.WriteLine("bool _isAnimatedVisualSourceDynamic = true;");
builder.WriteLine("bool _isTryCreateAnimatedVisualCalled;");
builder.WriteLine("bool _isImageLoadingStarted;");
builder.WriteLine("EventRegistrationTokenTable<TypedEventHandler<IDynamicAnimatedVisualSource, object>> _animatedVisualInvalidatedEventTokenTable;");
// Declare the variables to hold the surfaces.
foreach (var n in nodes)
{
builder.WriteLine($"{_stringifier.ReferenceTypeName(n.TypeName)} {n.FieldName};");
}
builder.WriteLine();
// Implement the INotifyPropertyChanged.PropertyChanged event.
builder.WriteSummaryComment("This implementation of the INotifyPropertyChanged.PropertyChanged event is specific to C# and does not work on WinRT.");
builder.WriteLine("public event PropertyChangedEventHandler PropertyChanged;");
builder.WriteLine();
// Implement the AnimatedVisualInvalidated event.
WriteAnimatedVisualInvalidatedEvent(builder);
// Define properties.
builder.WriteSummaryComment("If this property is set to true, <see cref=\"TryCreateAnimatedVisual\"/> will return null until all images have loaded. When all images have loaded, <see cref=\"TryCreateAnimatedVisual\"/> will return the AnimatedVisual. To use, set it when declaring the AnimatedVisualSource. Once <see cref=\"TryCreateAnimatedVisual\"/> is called, changes made to this property will be ignored. Default value is true.");
builder.WriteLine("public bool IsAnimatedVisualSourceDynamic");
builder.OpenScope();
builder.WriteLine("get { return _isAnimatedVisualSourceDynamic; }");
builder.WriteLine("set");
builder.OpenScope();
builder.WriteLine("if (!_isTryCreateAnimatedVisualCalled && _isAnimatedVisualSourceDynamic != value)");
builder.OpenScope();
builder.WriteLine("_isAnimatedVisualSourceDynamic = value;");
builder.WriteLine("NotifyPropertyChanged(nameof(IsAnimatedVisualSourceDynamic));");
builder.CloseScope();
builder.CloseScope();
builder.CloseScope();
builder.WriteLine();
builder.WriteSummaryComment("Returns true if all images have loaded. To see if the images succeeded to load, see <see cref=\"ImageSuccessfulLoadingProgress\"/>.");
builder.WriteLine("public bool IsImageLoadingCompleted { get; private set; }");
builder.WriteLine();
builder.WriteSummaryComment("Represents the progress of the image loading. Returns value between 0 and 1. 0 means none of the images finished loading. 1 means all images finished loading.");
builder.WriteLine("public double ImageSuccessfulLoadingProgress { get; private set; }");
builder.WriteLine();
// Generate the method that creates an instance of the animated visual.
builder.WriteLine("public IAnimatedVisual TryCreateAnimatedVisual(Compositor compositor, out object diagnostics)");
builder.OpenScope();
builder.WriteLine("_isTryCreateAnimatedVisualCalled = true;");
builder.WriteLine();
builder.WriteLine("diagnostics = null;");
builder.WriteLine("if (!IsRuntimeCompatible())");
builder.OpenScope();
builder.WriteLine("return null;");
builder.CloseScope();
builder.WriteLine();
builder.WriteLine("EnsureImageLoadingStarted();");
builder.WriteLine();
builder.WriteLine("if (_isAnimatedVisualSourceDynamic && _loadCompleteEventCount != c_loadedImageSurfaceCount)");
builder.OpenScope();
builder.WriteLine("return null;");
builder.CloseScope();
builder.WriteLine("return");
builder.Indent();
WriteAnimatedVisualCall(builder, info);
builder.UnIndent();
builder.CloseScope();
builder.WriteLine();
// Generate the method that load all the LoadedImageSurfaces.
WriteEnsureImageLoadingStarted(builder, info);
// Generate the method that handle the LoadCompleted event of the LoadedImageSurface objects.
WriteHandleLoadCompleted(builder);
// Generate the method that raise the PropertyChanged event.
builder.WriteLine("void NotifyPropertyChanged(string name)");
builder.OpenScope();
builder.WriteLine("PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));");
builder.CloseScope();
builder.WriteLine();
// Generate the method that get or create the EventRegistrationTokenTable.
builder.WriteLine("EventRegistrationTokenTable<TypedEventHandler<IDynamicAnimatedVisualSource, object>> GetAnimatedVisualInvalidatedEventRegistrationTokenTable()");
builder.OpenScope();
builder.WriteLine("return EventRegistrationTokenTable<TypedEventHandler<IDynamicAnimatedVisualSource, object>>.GetOrCreateEventRegistrationTokenTable(ref _animatedVisualInvalidatedEventTokenTable);");
builder.CloseScope();
builder.WriteLine();
}
