cxHelpEngine.cpp

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/*=========================================================================
This file is part of CustusX, an Image Guided Therapy Application.

Copyright (c) 2008-2014, SINTEF Department of Medical Technology
All rights reserved.

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   this list of conditions and the following disclaimer.

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   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

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   may be used to endorse or promote products derived from this software
   without specific prior written permission.

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#include "cxHelpEngine.h"

#include <QHelpEngine>
#include "cxDataLocations.h"
#include <iostream>
#include "cxTypeConversions.h"
#include <QFileInfo>
#include <QApplication>
#include <QWidget>
#include "cxLogger.h"
#include "cxProfile.h"
#include <QDir>
#include <QTimer>

//#define DEBUG_HELP_SYSTEM // turn on to output help system focus information

namespace cx
{

HelpEngine::HelpEngine()
{
        QDir().mkpath(profile()->getPath()); // otherwise setupData() fails sometimes
        QString helpFile = profile()->getPath() + "/cx_user_doc.qhc";
        helpEngine = new QHelpEngine(helpFile, NULL);

        this->setupDataWithWarning();

        QString docFile = DataLocations::getDocPath()+"/cx_user_doc.qch";
        helpEngine->registerDocumentation(docFile);

        this->setupDataWithWarning();

        connect(qApp, SIGNAL(focusObjectChanged(QObject*)), this, SLOT(focusObjectChanged(QObject*)));
        connect(qApp, SIGNAL(focusChanged(QWidget*, QWidget*)), this, SLOT(focusChanged(QWidget*, QWidget*)));

        QTimer::singleShot(100, this, SLOT(setInitialPage()));
}

HelpEngine::~HelpEngine()
{
        delete helpEngine;
}

void HelpEngine::setupDataWithWarning()
{
        bool success = helpEngine->setupData();
        // had problems here before mkdir was called on the qhc path
        if (!success)
                CX_LOG_WARNING() << QString("Help engine setup failed with error [%1]").arg(helpEngine->error());
}

void HelpEngine::setInitialPage()
{
        emit keywordActivated("user_doc_overview");
}

void HelpEngine::focusChanged(QWidget * old, QWidget * now)
{
        if (!now)
                return;
}

void HelpEngine::focusObjectChanged(QObject* newFocus)
{
        if (!newFocus)
                return;
#ifdef DEBUG_HELP_SYSTEM
        CX_LOG_CHANNEL_INFO("HELP_DB") << QString("**Focus on [%1]: %2").arg(newFocus->objectName()).arg(dynamic_cast<QWidget*>(newFocus)->windowTitle());
#endif
        QString keyword = this->findBestMatchingKeyword(newFocus);
        if (!keyword.isEmpty())
        {
#ifdef DEBUG_HELP_SYSTEM
                CX_LOG_CHANNEL_INFO("HELP_DB") << QString("    Found keyword [%1]").arg(keyword);
#endif
                emit keywordActivated(keyword);
        }
}

bool HelpEngine::isBreakChar(QChar c) const
{
        return c.isDigit() || c.isUpper();
}

bool HelpEngine::isBreakChar(QString text, int index) const
{
        if (!this->isBreakChar(text[index]))
                return false;

        bool prev = true;
        if (index>0)
                prev = this->isBreakChar(text[index-1]);

        bool next = true;
        if (index+1<text.size())
                next = this->isBreakChar(text[index+1]);

        if (!prev || !next)
                return true;

        return false;
}

QString HelpEngine::convertToKeyword(QString id) const
{
        // convert camel case strings into whitespace-separated lowercase strings:
        // MyWidget -> my widget
        // myFancy3DWidget2D -> my Fancy 3D Widget 2D -> my fancy 3d widget 2d
        // myFancyDWidget -> my Fancy D Widget -> my fancy D widget
        QString retval;
        retval.push_back(id[0]);
        for (int i=1; i<id.size(); ++i)
        {
                // break condition Q is (uppercase or digit)
                // insert whitespace before Q
                // ignore if previous was Q
                if (this->isBreakChar(id, i))
                {
                        retval.push_back("_"); // cant't get doxygenerated anchors to work properly with whitespace
                }
                retval.push_back(id[i]);
        }
        return retval.toLower();
}

QString HelpEngine::findBestMatchingKeyword(QObject* object)
{
        while (object)
        {
                QString id = this->convertToKeyword(object->objectName());
#ifdef DEBUG_HELP_SYSTEM
                CX_LOG_CHANNEL_DEBUG("HELP_DB") << QString("    examining [%1](%2)")
                                                                                   .arg(id)
                                                                                   .arg(object->metaObject()->className());
#endif
                if (id.contains("help_widget"))
                        return "";

                QMap<QString, QUrl> links = this->engine()->linksForIdentifier(id);
                if (!links.empty())
                {
                        return id;
                }

                object = object->parent();
        }
        return "";
}


}