author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Wed, 23 Jun 2010 18:00:21 +0300 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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#include "nmuiengineheaders.h" |
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/*! |
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\brief Constructor |
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Constructor of NmOperation |
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*/ |
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NmOperation::NmOperation() |
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: mProgress(0), |
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mIsRunning(true) |
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{ |
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NM_FUNCTION; |
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QMetaObject::invokeMethod(this, "runAsyncOperation", Qt::QueuedConnection); |
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} |
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/*! |
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\brief Destructor |
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*/ |
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NmOperation::~NmOperation() |
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{ |
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NM_FUNCTION; |
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while (!mPreliminaryOperations.isEmpty()) { |
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QPointer<NmOperation> operation = mPreliminaryOperations.takeLast(); |
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if (operation && operation->isRunning()) { |
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operation->cancelOperation(); |
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} |
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} |
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} |
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/*! |
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\brief Tells whether the operation is running or not |
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*/ |
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bool NmOperation::isRunning() const |
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NM_FUNCTION; |
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return mIsRunning; |
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} |
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/*! |
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\brief Adds a "preliminary operation" which needs to end until this operation can start. |
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*/ |
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void NmOperation::addPreliminaryOperation(NmOperation *operation) |
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{ |
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NM_FUNCTION; |
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// if the preliminary operation is already completed |
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// the input parameter can be null |
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if (operation && operation->isRunning()) { |
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connect(operation, SIGNAL(operationCompleted()), this, |
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SLOT(handlePreliminaryOperationFinished())); |
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connect(operation, SIGNAL(operationCancelled()), this, |
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SLOT(handlePreliminaryOperationFinished())); |
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mPreliminaryOperations.append(operation); |
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} |
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} |
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/*! |
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\brief Slot, complete |
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The performer of the asynchronous function call should use this slot when |
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the operation is completed, this will emit the actionCompleted signal * |
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\param result Result from operation |
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*/ |
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void NmOperation::completeOperation(int result) |
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{ |
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NM_FUNCTION; |
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mIsRunning = false; |
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// Operation is completed, emit the signal |
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doCompleteOperation(); |
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emit this->operationCompleted(result); |
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QMetaObject::invokeMethod(this, "deleteOperation", Qt::QueuedConnection); |
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} |
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/*! |
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\brief Slot, cancel |
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The observer of the asynchronous function call should use this slot if it |
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wants to cancel the ongoing operation, it will emit the actionCancelled signal |
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*/ |
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void NmOperation::cancelOperation() |
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{ |
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NM_FUNCTION; |
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mIsRunning = false; |
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// Operation is canceled, emit the signal |
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this->doCancelOperation(); |
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emit this->operationCancelled(); |
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QMetaObject::invokeMethod(this, "deleteOperation", Qt::QueuedConnection); |
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} |
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/*! |
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\brief Slot, update progress |
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The performer of the asynchronous function call should use this slot when |
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updating the operation progress, this will emit the progressChanged signal |
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*/ |
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void NmOperation::updateOperationProgress(int progress) |
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{ |
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NM_FUNCTION; |
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|
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mProgress = progress; |
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this->doUpdateOperationProgress(); |
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emit this->operationProgressChanged(mProgress); |
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} |
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123 |
|
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/*! |
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\brief Slot, run the operation if no preliminary operations are running. |
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Calls the pure virtual doRunAsyncOperation() of the derived class if there are no preliminary |
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operations running. Operation will be deleted after it has compeleted or cancelled and the control |
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returns to the event loop. |
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*/ |
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void NmOperation::runAsyncOperation() |
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{ |
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NM_FUNCTION; |
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|
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int count = mPreliminaryOperations.count(); |
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int ready = 0; |
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// go through preliminary operations |
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for (int i = 0; i < count; ++i) { |
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if (!mPreliminaryOperations[i] || !mPreliminaryOperations[i]->isRunning()) { |
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ready++; |
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} |
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} |
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// when all preliminary operations are either completed or cancelled |
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// start this one |
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if (count == ready) { |
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this->doRunAsyncOperation(); |
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} |
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} |
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|
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/*! |
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\brief Slot, update progress |
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This is signalled by a preliminary operation when its operation is completed or cancelled. |
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Do not call runAsyncOperation immediately but let the signal be handled by other slots first. |
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*/ |
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void NmOperation::handlePreliminaryOperationFinished() |
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{ |
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NM_FUNCTION; |
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157 |
|
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QMetaObject::invokeMethod(this, "runAsyncOperation", Qt::QueuedConnection); |
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} |
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160 |
|
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/*! |
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\brief Virtual function to be implemented by subclasses |
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This function is called from the completeAction before the signal is |
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emitted. Derived class can override this is some special actions |
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are needed. |
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*/ |
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void NmOperation::doCompleteOperation() |
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{ |
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NM_FUNCTION; |
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} |
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171 |
|
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/*! |
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\brief Virtual function to be implemented by subclasses |
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This function is called from the cancelAction after the trigger timer |
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and before the signal is emitted. Derived class can override this |
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and put its own cancellation operations here. |
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*/ |
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void NmOperation::doCancelOperation() |
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{ |
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NM_FUNCTION; |
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} |
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182 |
|
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183 |
/*! |
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\brief Virtual function to be implemented by subclasses |
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This function is called from the updateProgress after the progress |
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value has been updated and before the signal is emitted. Derived class |
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can override this. |
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*/ |
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void NmOperation::doUpdateOperationProgress() |
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{ |
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NM_FUNCTION; |
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} |
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193 |
|
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/*! |
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\brief Private slot for operation deleting |
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This is signalled when operation is completed or cancelled. |
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Delete happens when the control returns to the event loop. |
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*/ |
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void NmOperation::deleteOperation() |
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{ |
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NM_FUNCTION; |
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|
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this->deleteLater(); |
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} |
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205 |