MessageViewer.cpp Example File

    /* Copyright (c) 2012, 2013  BlackBerry Limited.
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.apache.org/licenses/LICENSE-2.0
    *
    * Unless required by applicable law or agreed to in writing, software
    * distributed under the License is distributed on an "AS IS" BASIS,
    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    * See the License for the specific language governing permissions and
    * limitations under the License.
    */

    #include "MessageViewer.hpp"

    #include <bb/pim/account/Account>
    #include <bb/pim/message/Message>

    using namespace bb::pim::account;
    using namespace bb::pim::message;

    MessageViewer::MessageViewer(MessageService *service, QObject *parent)
        : QObject(parent)
        , m_messageService(service)
        , m_messageId(-1)
        , m_accountId(-1)
    {
        // Ensure to invoke the messageUpdated() method whenever a message has been changed
        bool ok = connect(m_messageService, SIGNAL(messageUpdated(bb::pim::account::AccountKey, bb::pim::message::ConversationKey, bb::pim::message::MessageKey, bb::pim::message::MessageUpdate)),
                          SLOT(messageUpdated(bb::pim::account::AccountKey, bb::pim::message::ConversationKey, bb::pim::message::MessageKey, bb::pim::message::MessageUpdate)));
        Q_ASSERT(ok);
        Q_UNUSED(ok);
    }

    void MessageViewer::updateMessage()
    {
        // Store previous values
        const QString oldSubject = m_subject;
        const QString oldSender = m_sender;
        const QDateTime oldTime = m_time;
        const QString oldBody = m_body;

        // Fetch new values from persistent storage
        const Message message = m_messageService->message(m_accountId, m_messageId);

        m_subject = message.subject();
        m_sender = message.sender().displayableName();
        m_time = message.serverTimestamp();
        m_body = message.body(MessageBody::PlainText).plainText();
        if (m_body.isEmpty())
            m_body = message.body(MessageBody::Html).plainText();

        // Check whether values have changed
        if (oldSubject != m_subject)
            emit subjectChanged();

        if (oldSender != m_sender)
            emit senderChanged();

        if (oldTime != m_time)
            emit timeChanged();

        if (oldBody != m_body)
            emit bodyChanged();
    }

    void MessageViewer::messageUpdated(bb::pim::account::AccountKey accountId, bb::pim::message::ConversationKey, bb::pim::message::MessageKey messageId, const bb::pim::message::MessageUpdate&)
    {
        /**
         * Call updateMessage() only if the message we are currently displaying
         * has been changed.
         */
        if (m_accountId == accountId && m_messageId == messageId)
            updateMessage();
    }

    void MessageViewer::setMessage(AccountKey accountId, MessageKey messageId)
    {
        if (m_accountId != accountId || m_messageId != messageId) {
            m_accountId = accountId;
            m_messageId = messageId;

            // Trigger a refetch of the message for the new ID
            updateMessage();
        }
    }

    QString MessageViewer::subject() const
    {
        return m_subject;
    }

    QString MessageViewer::senderContact() const
    {
        return m_sender;
    }

    QString MessageViewer::time() const
    {
        if (!m_time.isValid())
            return tr("n/a");
        else
            return m_time.toString();
    }

    QString MessageViewer::body() const
    {
        return m_body;
    }