public static ContentPanelSource CreateFromUrl(string url)
{
ContentPanelSource source = new ContentPanelSource();
source.Id = c_genericIdBase + DateTime.Now.Ticks;
source.Url = url;
return(source);
}
/// <summary>
/// This is called by every piece of content when it is done loading or errors out.
/// </summary>
/// <param name="sourceId"></param>
public async void OnContentLoadComplete(string sourceId)
{
// Delay a little bit since this might kick off a background load
// and it isn't super important.
await Task.Delay(100);
bool isSourceVisible = false;
ContentPanelSource nextSource = null;
lock (m_currentPanelList)
{
// Check if we are waiting on us
if (m_currentLoadingContent != null && m_currentLoadingContent.Equals(sourceId))
{
if (m_delayLoadQueue.Count == 0)
{
// If the queue is empty set current to null and
// return.
m_currentLoadingContent = null;
return;
}
else
{
// Otherwise, grab the next element
nextSource = m_delayLoadQueue.First();
m_delayLoadQueue.RemoveAt(0);
// Get if the source is visible.
if (m_currentPanelList.ContainsKey(nextSource.Id))
{
isSourceVisible = m_currentPanelList[nextSource.Id].IsVisible;
}
// Set it loading
m_currentLoadingContent = nextSource.Id;
}
}
else
{
// Not waiting on us. Get out of here.
return;
}
}
// And out of lock start loading.
if (nextSource != null)
{
BeginLoadContent(nextSource, isSourceVisible);
}
}
public static ContentPanelSource CreateFromPost(FlipViewPostContext context, Post post)
{
ContentPanelSource source = new ContentPanelSource();
source.Id = post.Id;
source.Url = post.Url;
source.SelfText = post.Selftext;
source.Subreddit = post.Subreddit;
source.IsNSFW = post.IsOver18;
source.IsSelf = post.IsSelf;
source.post = post;
source.context = context;
return(source);
}
/// <summary>
/// Adds the content to the list of content that is allowed. If someone requested or request this
/// content they will get a control.
/// </summary>
/// <param name="source"></param>
public void AddAllowedContent(ContentPanelSource source, string groupId = "default", bool delayLoad = false)
{
bool isSourceVisible = false;
// First add an entry that we are making the control.
lock (m_currentPanelList)
{
ContentListElement element;
// Check to see if it already exists.
if (m_currentPanelList.ContainsKey(source.Id))
{
element = m_currentPanelList[source.Id];
if (element.State != ContentState.NotAllowed)
{
// We already have this element and it is already loading.
// just leave.
return;
}
element.State = ContentState.PendingCreation;
element.Source = source;
element.Group = groupId;
// If we have a host tell them we are starting to load their
// content (even though it might be delay loaded). This is safe
// to call under lock because it will async to the UI thread.
if (element.Host != null)
{
FireOnContentPreloading(element.Host);
}
}
else
{
// No one is listening, just make the object.
element = new ContentListElement()
{
State = ContentState.PendingCreation,
Group = groupId,
Source = source
};
m_currentPanelList.Add(source.Id, element);
}
// Set if we are visible or not
isSourceVisible = element.IsVisible;
// Check if we are delay load.
if (delayLoad)
{
// If so, check if there is content loading.
if (String.IsNullOrWhiteSpace(m_currentLoadingContent))
{
// If not then load us now.
m_currentLoadingContent = source.Id;
}
else
{
// Otherwise add use to the list and return
// #todo add a timeout to the waiting.
m_delayLoadQueue.Add(source);
return;
}
}
else
{
// If we are not delay loading set us to be the current content
// we are waiting on. Even if there is someone else, people should
// wait on this content.
m_currentLoadingContent = source.Id;
}
}
// If we got here we need to load some content!
BeginLoadContent(source, isSourceVisible);
}
/// <summary>
/// When fired the source given should fall back to a web
/// browser instead of a complex control.
/// </summary>
public async void FallbackToWebrowser(ContentPanelSource source)
{
IContentPanelHost hostToReport = null;
IContentPanelBase panelToKill = null;
// Fire on load complete so if someone else was waiting on us they will
// move on.
OnContentLoadComplete(source.Id);
// Lock
lock (m_currentPanelList)
{
// Make sure we have it.
if (m_currentPanelList.ContainsKey(source.Id))
{
// Grab the panel to kill and the host to tell.
ContentListElement element = m_currentPanelList[source.Id];
hostToReport = element.Host;
panelToKill = element.PanelBase;
// Null the post and update our state
element.PanelBase = null;
element.State = ContentState.Unloaded;
}
else
{
return;
}
}
// Remove the panel
if (hostToReport != null && panelToKill != null)
{
await FireOnRemovePanel(hostToReport, panelToKill);
}
// Kill the panel
if (panelToKill != null)
{
await FireOnDestroyContent(panelToKill);
panelToKill = null;
}
ContentPanelSource sourceToCreate = null;
bool isVisible = false;
// Now lock again
lock (m_currentPanelList)
{
// Make sure we still have it.
if (m_currentPanelList.ContainsKey(source.Id))
{
ContentListElement element = m_currentPanelList[source.Id];
if (element.State == ContentState.Unloaded)
{
// Grab the element again and set the new state.
isVisible = element.IsVisible;
element.Source.ForceWeb = true;
sourceToCreate = element.Source;
element.State = ContentState.PendingCreation;
}
else
{
// if we are not in the same state get out of here.
return;
}
}
else
{
return;
}
}
if (sourceToCreate != null)
{
BeginLoadContent(sourceToCreate, isVisible);
}
}
/// <summary>
/// This will actually do the loading of content. This starts the load but
/// the load isn't actually done until the app fires the loading function above.
/// </summary>
/// <param name="source"></param>
private void BeginLoadContent(ContentPanelSource source, bool isVisible)
{
// Next make the control, spin this off to keep the UI thread going.
Task.Run(async() =>
{
// Create a new base and panel.
ContentPanelBase panelBase = new ContentPanelBase();
bool panelLoaded = await panelBase.CreateContentPanel(source, CanLoadLaregePanel(isVisible));
bool destoryPanel = true;
IContentPanelHost hostToGivePanel = null;
IContentPanelHost hostToInformUnlaoded = null;
// Update the list with the control
lock (m_currentPanelList)
{
// Make sure it is still there.
if (m_currentPanelList.ContainsKey(source.Id))
{
ContentListElement element = m_currentPanelList[source.Id];
// Make sure we still have a good state.
if (element.State == ContentState.PendingCreation)
{
// Make sure the panel loaded
if (panelLoaded)
{
// Set the panel and state, if we have a host grab it.
destoryPanel = false;
element.PanelBase = panelBase;
element.State = ContentState.Created;
hostToGivePanel = element.Host;
}
else
{
// If we didn't load it was probably due to low memory.
// Set our state to unloaded and tell the host.
element.State = ContentState.Unloaded;
hostToInformUnlaoded = element.Host;
destoryPanel = true;
}
}
}
}
// If the entry is now gone or whatever, destroy the post.
if (destoryPanel)
{
await FireOnDestroyContent(panelBase);
}
else
{
// If we have a host inform them the panel is now ready.
if (hostToGivePanel != null)
{
FireOnPanelAvailable(hostToGivePanel, panelBase);
}
}
// If we have a host to tell that we unloaded the panel tell them.
if (hostToInformUnlaoded != null)
{
FireOnPanelUnloaded(hostToInformUnlaoded);
}
});
}
/// <summary>
/// Called when a panel changes visibility.
/// </summary>
/// <param name="sourcdId"></param>
public void OnPanelVisibliltyChanged(string sourceId, bool isVisible)
{
ContentPanelSource loadNowSource = null;
lock (m_currentPanelList)
{
// See if the panel exists.
if (m_currentPanelList.ContainsKey(sourceId))
{
// Get the element
ContentListElement element = m_currentPanelList[sourceId];
// Set the new visibility
element.IsVisible = isVisible;
// If we aren't visible get out of here now.
if (!isVisible)
{
return;
}
// If we are unloaded start loading right now.
if (element.State == ContentState.Unloaded)
{
// Grab the source
loadNowSource = element.Source;
// Set our state to pending.
element.State = ContentState.PendingCreation;
// Make the delay loading id this so everyone will wait on us.
m_currentLoadingContent = loadNowSource.Id;
}
// If we are pending make sure we aren't being delayed.
else if (element.State == ContentState.PendingCreation)
{
// See if this post is in the delay load post list.
foreach (ContentPanelSource source in m_delayLoadQueue)
{
if (source.Id.Equals(sourceId))
{
loadNowSource = source;
break;
}
}
// If we found the element clean it out of the queue
if (loadNowSource != null)
{
// Remove us from it and start loading now!
m_delayLoadQueue.Remove(loadNowSource);
// We want to load this now. No matter if we were currently waiting on someone or not
// all delay loaded post should wait on this one.
m_currentLoadingContent = loadNowSource.Id;
}
}
}
}
// Now that we are out of lock load the source if we have
// one to load.
if (loadNowSource != null)
{
BeginLoadContent(loadNowSource, true);
}
}
