/// <summary>
/// Enqueues an operation to remove the root view.
/// </summary>
/// <param name="rootViewTag">The root view tag.</param>
public void EnqueueRemoveRootView(int rootViewTag)
{
// Called on layout manager thread
UIViewOperationQueueInstance queue = GetQueueByTag(rootViewTag);
// Send forward
queue.EnqueueRemoveRootView(rootViewTag);
// Do some maintenance/cleanup if needed.
// Find the queue info
var pair = _dispatcherToOperationQueueInfo.First(p => p.Value.queueInstance == queue);
// Decrement number of root views
pair.Value.rootViewCount--;
if (queue != MainUIViewOperationQueue)
{
if (pair.Value.rootViewCount == 0)
{
// We can remove this queue and then destroy
_dispatcherToOperationQueueInfo.Remove(pair.Key);
// Simulate an OnDestroy from the correct dispatcher thread
// (OnResume/OnSuspend/OnDestroy have this thread affinity, all other methods do enqueuings in a thread safe manner)
DispatcherHelpers.RunOnDispatcher(pair.Key, queue.OnDestroy);
}
}
}
/// <summary>
/// Enqueues an operation to remove the root view.
/// </summary>
/// <param name="rootViewTag">The root view tag.</param>
public Task RemoveRootViewAsync(int rootViewTag)
{
// Called on layout manager thread
UIViewOperationQueueInstance queue = GetQueueByTag(rootViewTag);
// Send forward
queue.EnqueueRemoveRootView(rootViewTag);
// Do some maintenance/cleanup if needed.
// Find the queue info
KeyValuePair <CoreDispatcher, QueueInstanceInfo> pair;
lock (_lock)
{
pair = _dispatcherToOperationQueueInfo.First(p => p.Value.queueInstance == queue);
}
// Decrement number of root views
pair.Value.rootViewCount--;
if (queue != MainUIViewOperationQueue)
{
if (pair.Value.rootViewCount == 0)
{
lock (_lock)
{
// We can remove this queue and then destroy
_dispatcherToOperationQueueInfo.Remove(pair.Key);
}
// Simulate an OnDestroy from the correct dispatcher thread
// (OnResume/OnSuspend/OnDestroy have this thread affinity, all other methods do enqueuings in a thread safe manner)
return(DispatcherHelpers.CallOnDispatcher(pair.Key, () =>
{
queue.OnDestroy();
return true;
}));
}
else
{
return(Task.CompletedTask);
}
}
else
{
return(Task.CompletedTask);
}
}
/// <summary>
/// Enqueues an operation to measure the view relative to the window.
/// </summary>
/// <param name="tag">The tag of the view to measure.</param>
/// <param name="callback">The measurement result callback.</param>
public void EnqueueMeasureInWindow(int tag, ICallback callback)
{
// Called on layout manager thread
UIViewOperationQueueInstance queue = GetQueueByTag(tag, true);
if (queue == null)
{
// This is called bypassing the optimizer, so we need to fake a result for layout only nodes.
callback.Invoke();
return;
}
queue.EnqueueMeasureInWindow(tag, callback);
}
/// <summary>
/// Enqueues an operation to create a view.
/// </summary>
/// <param name="themedContext">The React context.</param>
/// <param name="viewReactTag">The view React tag.</param>
/// <param name="viewClassName">The view class name.</param>
/// <param name="initialProps">The initial props.</param>
/// <param name="rootViewTag">Root view tag.</param>
public void EnqueueCreateView(
ThemedReactContext themedContext,
int viewReactTag,
string viewClassName,
JObject initialProps,
int rootViewTag)
{
// Called on layout manager thread
UIViewOperationQueueInstance queue = GetQueueByTag(rootViewTag);
_reactTagToOperationQueue.Add(viewReactTag, queue);
queue.EnqueueCreateView(themedContext, viewReactTag, viewClassName, initialProps);
}
/// <summary>
/// Enqueues an operation to find a touch target.
/// </summary>
/// <param name="tag">The parent view to search from.</param>
/// <param name="targetX">The x-coordinate of the touch event.</param>
/// <param name="targetY">The y-coordinate of the touch event.</param>
/// <param name="callback">The callback.</param>
public void EnqueueFindTargetForTouch(
int tag,
double targetX,
double targetY,
ICallback callback)
{
// Called on layout manager thread
UIViewOperationQueueInstance queue = GetQueueByTag(tag, true);
if (queue == null)
{
// This is called bypassing the optimizer, so we need to fake a result for layout only nodes.
callback.Invoke();
return;
}
queue.EnqueueFindTargetForTouch(tag, targetX, targetY, callback);
}
/// <summary>
/// Used by the native animated module to bypass the process of
/// updating the values through the shadow view hierarchy. This method
/// will directly update the native views, which means that updates for
/// layout-related props won't be handled properly.
/// </summary>
/// <param name="tag">The view tag.</param>
/// <param name="props">The props.</param>
/// <remarks>
/// Make sure you know what you're doing before calling this method :)
/// </remarks>
public bool SynchronouslyUpdateViewOnDispatcherThread(int tag, JObject props)
{
// The native animations module is a single threaded implementation affinitized to the "main" dispatcher thread.
// As a result all calls of this method are on main dispatcher thread.
// Yet, for secondary views we have to dispatch to correct dispatcher as fast as possible
DispatcherHelpers.AssertOnDispatcher();
UIViewOperationQueueInstance queue = GetQueueByTag(tag, true);
if (queue == null)
{
// Returns false as per the caller's expectation
return(false);
}
if (queue == MainUIViewOperationQueue)
{
// Main queue case. Just forward.
if (!MainUIViewOperationQueue.NativeViewHierarchyManager.ViewExists(tag))
{
return(false);
}
MainUIViewOperationQueue.NativeViewHierarchyManager.UpdateProps(tag, props);
}
else
{
// Dispatch to the correct thread.
DispatcherHelpers.RunOnDispatcher(queue.Dispatcher, CoreDispatcherPriority.High, () =>
{
if (queue.NativeViewHierarchyManager.ViewExists(tag))
{
queue.NativeViewHierarchyManager.UpdateProps(tag, props);
}
else
{
Debug.WriteLine($"View with tag {tag} not found due to race condition");
}
});
}
return(true);
}
/// <summary>
/// Instantiates the <see cref="UIViewOperationQueue"/>.
/// </summary>
/// <param name="reactContext">The React context.</param>
/// <param name="viewManagerRegistry">
/// The view manager registry.
/// </param>
public UIViewOperationQueue(ReactContext reactContext, ViewManagerRegistry viewManagerRegistry)
{
_reactContext = reactContext;
_viewManagerRegistry = viewManagerRegistry;
_active = false;
// Corner case: UWP scenarios that start with no main window.
// We create the UIViewOperationQueueInstance for main dispatcher thread ahead of time so animations
// in secondary windows can work.
var queueInfo = new QueueInstanceInfo()
{
queueInstance = new UIViewOperationQueueInstance(
_reactContext,
new NativeViewHierarchyManager(_viewManagerRegistry, DispatcherHelpers.MainDispatcher, OnViewsDropped),
ReactChoreographer.Instance)
};
_dispatcherToOperationQueueInfo.Add(DispatcherHelpers.MainDispatcher, queueInfo);
_mainUiViewOperationsQueueInstance = queueInfo.queueInstance;
}