public CompareHashViewModel(
IImageHashSimilarityCalculator calculator,
FileHashViewModel fileA,
FileHashViewModel fileB)
{
if (calculator == null)
{
throw new ArgumentNullException(nameof(calculator));
}
this.fileA = fileA ?? throw new ArgumentNullException(nameof(fileA));
this.fileB = fileB ?? throw new ArgumentNullException(nameof(fileB));
CalculateCommand = new CapturingExceptionAsyncCommand(
async() =>
{
Busy = true;
try
{
var a1 = fileA.AverageHash;
var a2 = fileB.AverageHash;
AverageHash = await Task.Run(() => calculator.Calculate(a1, a2));
var d1 = fileA.DifferenceHash;
var d2 = fileB.DifferenceHash;
DifferenceHash = await Task.Run(() => calculator.Calculate(d1, d2));
var p1 = fileA.PerceptualHash;
var p2 = fileB.PerceptualHash;
PerceptualHash = await Task.Run(() => calculator.Calculate(p1, p2));
}
finally
{
Busy = false;
}
},
() => fileA.Loaded && fileB.Loaded && !Busy);
PropertyChanged += OnPropertyChanged;
fileA.PropertyChanged += OnPropertyChanged;
fileB.PropertyChanged += OnPropertyChanged;
}
