public void ExecutionBlocks ()
{
using (var bo = NSBlockOperation.Create (Create_Null)) {
bo.AddExecutionBlock (Add_Null);
Assert.That (bo.ExecutionBlocks.Length, Is.EqualTo (2), "ExecutionBlocks");
}
}
public override void DidUpdateFocus (UIFocusUpdateContext context, UIFocusAnimationCoordinator coordinator)
{
var nextFocusedView = context.NextFocusedView;
if (!nextFocusedView.IsDescendantOfView (TableView))
return;
NSIndexPath indexPath = ((UITableViewFocusUpdateContext)context).NextFocusedIndexPath;
if (indexPath == null)
return;
// Cancel any previously queued segues.
delayedSeguesOperationQueue.CancelAllOperations ();
// Create an `NSBlockOperation` to perform the detail segue after a delay.
var performSegueOperation = new NSBlockOperation ();
var segueIdentifier = SegueIdentifierMap[indexPath.Section][indexPath.Row];
performSegueOperation.AddExecutionBlock (() => {
NSThread.SleepFor (performSegueDelay);
if (performSegueOperation.IsCancelled && segueIdentifier == lastPerformedSegueIdentifier)
return;
NSOperationQueue.MainQueue.AddOperation (() => {
PerformSegue (segueIdentifier, nextFocusedView);
lastPerformedSegueIdentifier = segueIdentifier;
TableView.SelectRow (indexPath, true, UITableViewScrollPosition.None);
});
});
delayedSeguesOperationQueue.AddOperation (performSegueOperation);
}
public void Add_Null ()
{
using (var bo = NSBlockOperation.Create (Create_Null)) {
// Objective-C exception thrown. Name: NSInvalidArgumentException Reason: *** -[NSBlockOperation addExecutionBlock:]: block is nil
Assert.Throws<ArgumentNullException> (() => bo.AddExecutionBlock (null));
}
}
public void ComposeCell(DataItemCollectionViewCell cell, DataItem dataItem)
{
var operationQueue = OperationQueueForCell(cell);
operationQueue.CancelAllOperations();
cell.RepresentedDataItem = dataItem;
cell.Label.Text = dataItem.Title;
cell.ImageView.Alpha = 1f;
cell.ImageView.Image = (UIImage)processedImageCache.ObjectForKey((NSString)dataItem.Identifier);
if (cell.ImageView.Image != null)
{
return;
}
var processImageOperation = new NSBlockOperation();
processImageOperation.AddExecutionBlock(() => {
if (processImageOperation.IsCancelled)
{
return;
}
UIImage image = null;
DispatchQueue.MainQueue.DispatchSync(() => {
image = ProcessImageNamed(dataItem.ImageName);
});
if (image == null)
{
return;
}
processedImageCache.SetObjectforKey(image, (NSString)dataItem.Identifier);
NSOperationQueue.MainQueue.AddOperation(() => {
if (cell.RepresentedDataItem == null)
{
return;
}
cell.ImageView.Alpha = 0f;
cell.ImageView.Image = image;
UIView.Animate(0.25, () => cell.ImageView.Alpha = 1f);
});
});
operationQueue.AddOperation(processImageOperation);
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
Title = "Shipping Rates";
// Setup both operations to run
var shopOperation = new GetShopOperation(client);
shopOperation.DidReceiveShop += (op, shop) => {
currencyFormatter = new NSNumberFormatter();
currencyFormatter.NumberStyle = NSNumberFormatterStyle.Currency;
currencyFormatter.CurrencyCode = shop.Currency;
};
shopOperation.FailedToReceiveShop += (op, error) => {
Console.WriteLine("Failed to retrieve shop: {0}", error);
};
NSOperationQueue.MainQueue.AddOperation(shopOperation);
var shippingOperation = new GetShippingRatesOperation(client, checkout);
shippingOperation.DidReceiveShippingRates += (op, rates) => {
shippingRates = rates;
};
shippingOperation.FailedToReceiveShippingRates += (op, error) => {
Console.WriteLine("Failed to retrieve shipping rates: {0}", error);
};
NSOperationQueue.MainQueue.AddOperation(shippingOperation);
UIApplication.SharedApplication.NetworkActivityIndicatorVisible = true;
// Ensure both operations are completed before we reload the table view
var blockOperation = NSBlockOperation.Create(() => {
UIApplication.SharedApplication.NetworkActivityIndicatorVisible = false;
TableView.ReloadData();
});
blockOperation.AddDependency(shopOperation);
blockOperation.AddDependency(shippingOperation);
NSOperationQueue.MainQueue.AddOperation(blockOperation);
allOperations = new NSOperation[] {
blockOperation,
shopOperation,
shippingOperation
};
}
public void ComposeCell (DataItemCollectionViewCell cell, DataItem dataItem)
{
var operationQueue = OperationQueueForCell (cell);
operationQueue.CancelAllOperations ();
cell.RepresentedDataItem = dataItem;
cell.Label.Text = dataItem.Title;
cell.ImageView.Alpha = 1f;
cell.ImageView.Image = (UIImage)processedImageCache.ObjectForKey ((NSString)dataItem.Identifier);
if (cell.ImageView.Image != null)
return;
var processImageOperation = new NSBlockOperation ();
processImageOperation.AddExecutionBlock (() => {
if (processImageOperation.IsCancelled)
return;
UIImage image = null;
DispatchQueue.MainQueue.DispatchSync (() => {
image = ProcessImageNamed (dataItem.ImageName);
});
if (image == null)
return;
processedImageCache.SetObjectforKey (image, (NSString)dataItem.Identifier);
NSOperationQueue.MainQueue.AddOperation (() => {
if (cell.RepresentedDataItem == null)
return;
cell.ImageView.Alpha = 0f;
cell.ImageView.Image = image;
UIView.Animate (0.25, () => cell.ImageView.Alpha = 1f);
});
});
operationQueue.AddOperation (processImageOperation);
}
public override void DidUpdateFocus(UIFocusUpdateContext context, UIFocusAnimationCoordinator coordinator)
{
var nextFocusedView = context.NextFocusedView;
if (!nextFocusedView.IsDescendantOfView(TableView))
{
return;
}
NSIndexPath indexPath = ((UITableViewFocusUpdateContext)context).NextFocusedIndexPath;
if (indexPath == null)
{
return;
}
// Cancel any previously queued segues.
delayedSeguesOperationQueue.CancelAllOperations();
// Create an `NSBlockOperation` to perform the detail segue after a delay.
var performSegueOperation = new NSBlockOperation();
var segueIdentifier = SegueIdentifierMap[indexPath.Section][indexPath.Row];
performSegueOperation.AddExecutionBlock(() => {
NSThread.SleepFor(performSegueDelay);
if (performSegueOperation.IsCancelled && segueIdentifier == lastPerformedSegueIdentifier)
{
return;
}
NSOperationQueue.MainQueue.AddOperation(() => {
PerformSegue(segueIdentifier, nextFocusedView);
lastPerformedSegueIdentifier = segueIdentifier;
TableView.SelectRow(indexPath, true, UITableViewScrollPosition.None);
});
});
delayedSeguesOperationQueue.AddOperation(performSegueOperation);
}
public void Create_Null()
{
// Objective-C exception thrown. Name: NSInvalidArgumentException Reason: *** -[NSBlockOperation addExecutionBlock:]: block is nil
NSBlockOperation.Create(null);
}
