public MandelbrotViewModel(double baseWidth, double baseHeight)
{
this.baseWidth = baseWidth;
this.baseHeight = baseHeight;
// Create MandelbrotModel object.
MandelbrotModel model = new MandelbrotModel();
// Progress reporter
Progress <double> progressReporter = new Progress <double>((double progress) =>
{
Progress = progress;
});
CancellationTokenSource cancelTokenSource = null;
// Define CalculateCommand and CancelCommand
CalculateCommand = new Command(
execute: async() =>
{
// Disable this button and enable Cancel button.
IsBusy = true;
((Command)CalculateCommand).ChangeCanExecute();
((Command)CancelCommand).ChangeCanExecute();
// Create CancellationToken.
cancelTokenSource = new CancellationTokenSource();
CancellationToken cancelToken = cancelTokenSource.Token;
try
{
// Perform the calculation.
BitmapInfo = await model.CalculateAsync(TargetCenter,
baseWidth / TargetMagnification,
baseHeight / TargetMagnification,
PixelWidth, PixelHeight,
Iterations,
progressReporter,
cancelToken);
// Processing only for a successful completion.
CurrentCenter = TargetCenter;
CurrentMagnification = TargetMagnification;
RealOffset = 0.5;
ImaginaryOffset = 0.5;
}
catch (OperationCanceledException)
{
// Operation cancelled!
}
catch
{
// Another type of exception? This should not occur.
}
// Processing regardless of success or cancellation.
Progress = 0;
IsBusy = false;
// Disable Cancel button and enable this button.
((Command)CalculateCommand).ChangeCanExecute();
((Command)CancelCommand).ChangeCanExecute();
},
canExecute: () =>
{
return(!IsBusy);
});
CancelCommand = new Command(
execute: () =>
{
cancelTokenSource.Cancel();
},
canExecute: () =>
{
return(IsBusy);
});
}
public MandelbrotViewModel(double baseWidth, double baseHeight)
{
this.baseWidth = baseWidth;
this.baseHeight = baseHeight;
// Create MandelbrotModel object.
MandelbrotModel model = new MandelbrotModel();
// Progress reporter
Progress<double> progressReporter = new Progress<double>((double progress) =>
{
Progress = progress;
});
CancellationTokenSource cancelTokenSource = null;
// Define CalculateCommand and CancelCommand
CalculateCommand = new Command(
execute: async () =>
{
// Disable this button and enable Cancel button.
IsBusy = true;
((Command)CalculateCommand).ChangeCanExecute();
((Command)CancelCommand).ChangeCanExecute();
// Create CancellationToken.
cancelTokenSource = new CancellationTokenSource();
CancellationToken cancelToken = cancelTokenSource.Token;
try
{
// Perform the calculation.
BitmapInfo = await model.CalculateAsync(TargetCenter,
baseWidth / TargetMagnification,
baseHeight / TargetMagnification,
PixelWidth, PixelHeight,
Iterations,
progressReporter,
cancelToken);
// Processing only for a successful completion.
CurrentCenter = TargetCenter;
CurrentMagnification = TargetMagnification;
RealOffset = 0.5;
ImaginaryOffset = 0.5;
}
catch (OperationCanceledException)
{
// Operation cancelled!
}
catch
{
// Another type of exception? This should not occur.
}
// Processing regardless of success or cancellation.
Progress = 0;
IsBusy = false;
// Disable Cancel button and enable this button.
((Command)CalculateCommand).ChangeCanExecute();
((Command)CancelCommand).ChangeCanExecute();
},
canExecute: () =>
{
return !IsBusy;
});
CancelCommand = new Command(
execute: () =>
{
cancelTokenSource.Cancel();
},
canExecute: () =>
{
return IsBusy;
});
}
