/// <summary>Raises the <see cref="Retargeted"/> event.</summary>
/// <param name="e">The data for the event.</param>
protected virtual void OnRetargeted(GeckoRetargetedEventArgs e)
{
var evnt = ((EventHandler<GeckoRetargetedEventArgs>)Events[RetargetedEvent]);
if (evnt != null) evnt(this, e);
}
void nsIWebProgressListener.OnStateChange(nsIWebProgress aWebProgress, nsIRequest aRequest, uint aStateFlags, int aStatus) {
const int NS_BINDING_ABORTED = unchecked((int)0x804B0002);
#region validity checks
// The request parametere may be null
if (aRequest == null)
return;
// Ignore ViewSource requests, they don't provide the URL
// see: http://mxr.mozilla.org/mozilla-central/source/netwerk/protocol/viewsource/nsViewSourceChannel.cpp#114
{
var viewSource = Xpcom.QueryInterface<nsIViewSourceChannel>( aRequest );
if ( viewSource != null )
{
Marshal.ReleaseComObject( viewSource );
return;
}
}
#endregion validity checks
using (var request = Gecko.Net.Request.CreateRequest(aRequest))
{
#region request parameters
Uri destUri = null;
Uri.TryCreate(request.Name, UriKind.Absolute, out destUri);
var domWindow = aWebProgress.GetDOMWindowAttribute().Wrap(x => new GeckoWindow(x));
/* This flag indicates that the state transition is for a request, which includes but is not limited to document requests.
* Other types of requests, such as requests for inline content (for example images and stylesheets) are considered normal requests.
*/
bool stateIsRequest = ((aStateFlags & nsIWebProgressListenerConstants.STATE_IS_REQUEST) != 0);
/* This flag indicates that the state transition is for a document request. This flag is set in addition to STATE_IS_REQUEST.
* A document request supports the nsIChannel interface and its loadFlags attribute includes the nsIChannel ::LOAD_DOCUMENT_URI flag.
* A document request does not complete until all requests associated with the loading of its corresponding document have completed.
* This includes other document requests (for example corresponding to HTML <iframe> elements).
* The document corresponding to a document request is available via the DOMWindow attribute of onStateChange()'s aWebProgress parameter.
*/
bool stateIsDocument = ((aStateFlags & nsIWebProgressListenerConstants.STATE_IS_DOCUMENT) != 0);
/* This flag indicates that the state transition corresponds to the start or stop of activity in the indicated nsIWebProgress instance.
* This flag is accompanied by either STATE_START or STATE_STOP, and it may be combined with other State Type Flags.
*
* Unlike STATE_IS_WINDOW, this flag is only set when activity within the nsIWebProgress instance being observed starts or stops.
* If activity only occurs in a child nsIWebProgress instance, then this flag will be set to indicate the start and stop of that activity.
* For example, in the case of navigation within a single frame of a HTML frameset, a nsIWebProgressListener instance attached to the
* nsIWebProgress of the frameset window will receive onStateChange() calls with the STATE_IS_NETWORK flag set to indicate the start and
* stop of said navigation. In other words, an observer of an outer window can determine when activity, that may be constrained to a
* child window or set of child windows, starts and stops.
*/
bool stateIsNetwork = ((aStateFlags & nsIWebProgressListenerConstants.STATE_IS_NETWORK) != 0);
/* This flag indicates that the state transition corresponds to the start or stop of activity in the indicated nsIWebProgress instance.
* This flag is accompanied by either STATE_START or STATE_STOP, and it may be combined with other State Type Flags.
* This flag is similar to STATE_IS_DOCUMENT. However, when a document request completes, two onStateChange() calls with STATE_STOP are generated.
* The document request is passed as aRequest to both calls. The first has STATE_IS_REQUEST and STATE_IS_DOCUMENT set, and the second has
* the STATE_IS_WINDOW flag set (and possibly the STATE_IS_NETWORK flag set as well -- see above for a description of when the STATE_IS_NETWORK
* flag may be set). This second STATE_STOP event may be useful as a way to partition the work that occurs when a document request completes.
*/
bool stateIsWindow = ((aStateFlags & nsIWebProgressListenerConstants.STATE_IS_WINDOW) != 0);
#endregion request parameters
#region STATE_START
/* This flag indicates the start of a request.
* This flag is set when a request is initiated.
* The request is complete when onStateChange() is called for the same request with the STATE_STOP flag set.
*/
if ((aStateFlags & nsIWebProgressListenerConstants.STATE_START) != 0)
{
if (stateIsNetwork && domWindow.IsTopWindow())
{
IsBusy = true;
GeckoNavigatingEventArgs ea = new GeckoNavigatingEventArgs(destUri, domWindow);
OnNavigating(ea);
if (ea.Cancel)
{
aRequest.Cancel(NS_BINDING_ABORTED);
// clear busy state
IsBusy = false;
// clear progress bar
OnProgressChanged(new GeckoProgressEventArgs(100, 100));
// clear status bar
StatusText = "";
}
}
else if (stateIsDocument)
{
GeckoNavigatingEventArgs ea = new GeckoNavigatingEventArgs(destUri, domWindow);
OnFrameNavigating(ea);
if (ea.Cancel)
{
if (!Xpcom.IsLinux)
aRequest.Cancel(NS_BINDING_ABORTED);
}
}
}
#endregion STATE_START
#region STATE_REDIRECTING
/* This flag indicates that a request is being redirected.
* The request passed to onStateChange() is the request that is being redirected.
* When a redirect occurs, a new request is generated automatically to process the new request.
* Expect a corresponding STATE_START event for the new request, and a STATE_STOP for the redirected request.
*/
else if ((aStateFlags & nsIWebProgressListenerConstants.STATE_REDIRECTING) != 0)
{
// make sure we're loading the top-level window
GeckoRedirectingEventArgs ea = new GeckoRedirectingEventArgs(destUri, domWindow);
OnRedirecting(ea);
if (ea.Cancel)
{
aRequest.Cancel(NS_BINDING_ABORTED);
}
}
#endregion STATE_REDIRECTING
#region STATE_TRANSFERRING
/* This flag indicates that data for a request is being transferred to an end consumer.
* This flag indicates that the request has been targeted, and that the user may start seeing content corresponding to the request.
*/
else if ((aStateFlags & nsIWebProgressListenerConstants.STATE_TRANSFERRING) != 0)
{
}
#endregion STATE_TRANSFERRING
#region STATE_STOP
/* This flag indicates the completion of a request.
* The aStatus parameter to onStateChange() indicates the final status of the request.
*/
else if ((aStateFlags & nsIWebProgressListenerConstants.STATE_STOP) != 0)
{
/* aStatus
* Error status code associated with the state change.
* This parameter should be ignored unless aStateFlags includes the STATE_STOP bit.
* The status code indicates success or failure of the request associated with the state change.
*
* Note: aStatus may be a success code even for server generated errors, such as the HTTP 404 File Not Found error.
* In such cases, the request itself should be queried for extended error information (for example for HTTP requests see nsIHttpChannel).
*/
if (stateIsNetwork)
{
// clear busy state
IsBusy = false;
if (aStatus == 0)
{
// navigating to a unrenderable file (.zip, .exe, etc.) causes the request pending;
// also an OnStateChange call with aStatus:804B0004(NS_BINDING_RETARGETED) has been generated previously.
if (!request.IsPending)
{
// kill any cached document and raise DocumentCompleted event
OnDocumentCompleted(new GeckoDocumentCompletedEventArgs(destUri, domWindow));
// clear progress bar
OnProgressChanged(new GeckoProgressEventArgs(100, 100));
}
}
else
{
OnNavigationError(new GeckoNavigationErrorEventArgs(request.Name, domWindow, aStatus));
}
// clear status bar
StatusText = "";
}
if (stateIsRequest)
{
if ((aStatus & 0xff0000) == ((GeckoError.NS_ERROR_MODULE_SECURITY + GeckoError.NS_ERROR_MODULE_BASE_OFFSET) << 16))
{
var ea = new GeckoNSSErrorEventArgs(destUri, aStatus);
OnNSSError(ea);
if (ea.Handled)
{
aRequest.Cancel(GeckoError.NS_BINDING_ABORTED);
}
}
if (aStatus == GeckoError.NS_BINDING_RETARGETED)
{
GeckoRetargetedEventArgs ea = new GeckoRetargetedEventArgs(destUri, domWindow, request);
OnRetargeted(ea);
}
}
}
#endregion STATE_STOP
if (domWindow!=null)
{
domWindow.Dispose();
}
}
}