User:Emre/tb/activitymanagerInterface: Difference between revisions

User:Emre/tb/activitymanagerInterface (view source)

Revision as of 23:17, 4 December 2008

3,107 bytes added , 4 December 2008

→‎Scenarios

Emre

270

edits

@@ Line 137: / Line 137: @@
   gActivityManager.registerActivityViewType("junk_filtering", VIEW_TYPE_STANDALONE);
-=== Showing an user-defined activity with cancel capability ===
+=== Showing an user-defined activity with cancel capability (JS)===
 This sample will improve the previous one by providing an nsIActivityCancelable to allow the user cancel the process.
@@ Line 176: / Line 176: @@
 Since nsIActivityCancelable is provided with the activity, UI will show a cancel button besides the activity. You can extrapolate this sample to nsIActivityRetryable and nsIActivityPausable as well.
+=== Showing an user-defined activity with undo capability (C++) ===
+ .....
+ #include "nsIActivity.h"
+ #include "nsIActivityManager.h"
+ .....
+ //////////////////////////////////////////////////////////////////////////////
+ //// Undo handler implementation
+ class myCopyEventUndo : public nsIActivityUndoHandler
+ {
+  public:
+   NS_DECL_ISUPPORTS
+   NS_DECL_NSIACTIVITYUNDOHANDLER
+   myCopyEventUndo() {}
+  private:
+   ~myCopyEventUndo() {}
+ };
+ NS_IMPL_ISUPPORTS1(myCopyEventUndo, nsIActivityUndoHandler)
+ NS_IMETHODIMP myCopyEventUndo::Undo(nsIActivityEvent *event, nsresult *result)
+ {
+   nsresult rv;
+   // get the subjects of this copy event
+   PRUint32 length;
+   nsIVariant **subjectList;
+   rv = event->GetSubjects(&length, &subjectList);
+   if(NS_FAILED(rv))
+     return rv;
+   // first subject in the list is the source folder in this particular case
+   nsCOMPtr<nsIMsgFolder> folder = do_QueryInterface(subjectList[0]);
+   // get the initiator
+   nsIVariant *initiator;
+   event->GetInitiator(&initiator);
+   if (initiator)
+   {
+     nsISupports* ptr;
+     rv = object->GetAsISupports(&ptr);
+     if(NS_FAILED(rv))
+       return rv;
+     nsCOMPtr<nsIMsgCopyService> copyService = do_QueryInterface(ptr);
+     if (copyService)
+       copyService->Undo(folder);
+   }
+   *result = NS_OK;
+   return NS_OK;
+  }
+ /////////////////////////////////////////////////////////////////////////////
+ //// Creating an undoable copy event
+ nsCOMPtr<nsIActivityUndoHandler> undoHandler = new myCopyEventUndo();
+ nsCOMPtr<nsIActivityEvent> copyEvent(do_CreateInstance("@mozilla.org/activity-event;1"));
+ // The initiator of this particular event is CopyService. We want to
+ // associate it with the event since we are going to use it in the
+ // undo handler.
+ // Same for the source folder, it is required for undo operation, but
+ // since it is the subject of this activity (event), it goes into the
+ // subject list.
+ // wrap copyservice in a nsvariant component
+ nsCOMPtr<nsIWritableVariant> initiator = do_CreateInstance(NS_VARIANT_CONTRACTID);
+ initiator->SetAsISupports(reinterpret_cast<nsISupports*>(copyService));
+ // subject of the delete operation is the imap folder
+ // wrap it in a nsvariant component
+ nsCOMPtr<nsIWritableVariant> srcFolder = do_CreateInstance(NS_VARIANT_CONTRACTID);
+ srcFolder->SetAsISupports(reinterpret_cast<nsISupports*>(imapFolder));
+ copyEvent->AddSubject(srcFolder);
+ copyEvent->InitWithHandlers(
+                          NS_LITERAL_STRING("Message copy event"),
+                          NS_LITERAL_STRING("Completed successfully"),
+                          PR_Now() / PR_USEC_PER_MSEC,   // start time
+                          PR_Now() / PR_USEC_PER_MSEC,   // completion time
+                          initiator,
+                          undoHandler);
+ ////////////////////////////////////////////////////////////////
+ //// Adding the event into Activity Manager
+ nsCOMPtr<nsIActivityManager> activityMgr(do_GetService("@mozilla.org/activity-manager;1"));
+ PRUint32 id;
+ activityMgr->AddActivity(copyEvent, &id);
 === Adding an activity with custom context type ===