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162 lines
5.2 KiB
162 lines
5.2 KiB
/*
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kopetetask.h - Kopete Task
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Copyright (c) 2004 by Richard Smith <kde@metafoo.co.uk>
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Kopete (c) 2002-2004 by the Kopete developers <kopete-devel@kde.org>
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*************************************************************************
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* *
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* This library is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU Lesser General Public *
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* License as published by the Free Software Foundation; either *
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* version 2 of the License, or (at your option) any later version. *
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* *
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*************************************************************************
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*/
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#ifndef KOPETETASK_H
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#define KOPETETASK_H
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#include <tqobject.h>
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#include <kdemacros.h>
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namespace Kopete
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{
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/**
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* The base class for all tasks.
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* For most tasks created in Kopete, the code looks like
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*
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* \code
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* Kopete::Task *task = someobject->someoperation( some parameters );
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* connect( task, TQT_SIGNAL( result( Kopete::Task * ) ),
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* this, TQT_SLOT( slotResult( Kopete::Task * ) ) );
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* \endcode
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* (other connects, specific to the job)
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*
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* And slotResult is usually at least:
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*
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* \code
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* if ( !task->succeeded() )
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* Kopete::UI::Global::showTaskError( task );
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* \endcode
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*
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* Much of the ideas (and some of the documentation and function names) for this
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* class come from TDEIO::Job.
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* @author Richard Smith <kde@metafoo.co.uk>
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*/
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class Task : public TQObject
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{
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TQ_OBJECT
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protected:
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Task();
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public:
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~Task();
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/**
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* Returns whether the task completed successfully.
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* Only call this method from the slot connected to result().
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* @return if the task succeeded, returns true, otherwise returns false.
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*/
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bool succeeded() const;
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/**
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* Converts an error code and a non-i18n error message into an
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* error message in the current language. The low level (non-i18n)
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* error message (usually a url) is put into the translated error
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* message using %%1.
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*
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* Use this to display the error yourself, but for a dialog box
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* use Kopete::UI::Global::showTaskError. Do not call it if succeeded()
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* returns true.
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* @return the error message and if there is no error, a message
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* telling the user that the app is broken, so check with
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* succeeded() whether there is an error.
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*/
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const TQString &errorString() const;
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/** Flags for the abort() function */
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enum AbortFlags { AbortNormal = 0, AbortEmitResult = 1 };
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public slots:
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/**
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* Abort this task.
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* This aborts all subtasks and deletes the task.
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*
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* @param flags a combination of flags from AbortFlags. If AbortEmitResult is
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* set, Job will emit the result signal. AbortEmitResult is removed
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* from the flags passed to the abort function of subtasks.
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*/
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virtual void abort( int flags = AbortNormal );
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signals:
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/**
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* Emitted when the task is finished, in any case (completed, canceled,
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* failed...). Use error() to find the result.
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* @param task the task that emitted this signal
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*/
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void result( Kopete::Task *task );
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/**
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* Emitted to display status information about this task.
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* Examples of messages are:
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* "Removing ICQ contact Joe from server-side list",
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* "Loading account plugin", etc.
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* @param task the task that emitted this signal
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* @param message the info message
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*/
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void statusMessage( Kopete::Task *task, const TQString &message );
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protected:
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/**
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* Add a task that has to be completed before a result is emitted. This
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* obviously should not be called after the finish signal is emitted by
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* the subtask.
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*
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* @param task the subtask to add
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*/
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virtual void addSubtask( Task *task );
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enum RemoveSubtaskIfLast { IfLastDoNothing, IfLastEmitResult };
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/**
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* Mark a sub job as being done. If it's the last to
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* wait on the job will emit a result - jobs with
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* two steps might want to override slotResult
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* in order to avoid calling this method.
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*
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* @param task the subjob to add
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* @param actionIfLast the action to take if this is the last subtask.
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* If set to IfLastEmitResult, the error information from @p task
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* will be copied to this object, and emitResult() will be called.
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*/
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virtual void removeSubtask( Task *task, RemoveSubtaskIfLast actionIfLast = IfLastEmitResult );
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enum Result { ResultFailed = 0, ResultSucceeded = 1 };
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/**
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* Utility function to emit the result signal, and suicide this job.
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* Sets the stored result and error message to @p result and @p errorMessage.
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* You should call this instead of emitting the result() signal yourself.
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*/
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void emitResult( Result result = ResultSucceeded, const TQString &errorMessage = TQString() );
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protected slots:
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/**
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* Called whenever a subtask finishes.
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* The default implementation checks for errors and propagates
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* them to this task, then calls removeSubtask().
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* Override if you want to provide a different @p actionIfLast to
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* removeSubtask, or want to perform some other processing in response
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* to a subtask finishing
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* @param task the subtask that finished
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* @see result()
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*/
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virtual void slotResult( Kopete::Task *task );
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private:
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class Private;
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Private *d;
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};
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}
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#endif
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