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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the Qt Mobility Components.

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     9 ** $QT_BEGIN_LICENSE:LGPL$

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    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

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    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

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    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include "explorer.h"

    43 #include <QTimer>

    44 #include <QDebug>

    45 #include <qsensor.h>

    46 #include <QMetaObject>

    47 #include <QMetaProperty>

    48 

    49 QTM_USE_NAMESPACE

    50 

    51 Explorer::Explorer(QWidget *parent)

    52     : QMainWindow(parent)

    53 {

    54     setupUi(this);

    55     // Clear out example data from the .ui file

    56     m_sensors->clear();

    57     clearReading();

    58     // We need to know when this widget resizes

    59     // so we can resize the columns

    60     m_reading->installEventFilter(this);

    61 }

    62 

    63 Explorer::~Explorer()

    64 {

    65 }

    66 

    67 void Explorer::loadSensors()

    68 {

    69     qDebug() << "Explorer::loadSensors";

    70 

    71     // Clear out anything that's in there now

    72     m_sensors->clear();

    73 

    74     foreach (const QByteArray &type, QSensor::sensorTypes()) {

    75         qDebug() << "Found type" << type;

    76         // The type item. We don't add it yet because there may not be any sensors of this type

    77         // and we only show types that have sensors available.

    78         QTreeWidgetItem *typeItem = new QTreeWidgetItem(QStringList() << QString::fromLatin1(type));

    79         bool added = false;

    80         foreach (const QByteArray &identifier, QSensor::sensorsForType(type)) {

    81             qDebug() << "Found identifier" << identifier;

    82             // Don't put in sensors we can't connect to

    83             QSensor sensor;

    84             sensor.setType(type);

    85             sensor.setIdentifier(identifier);

    86             if (!sensor.connect()) {

    87                 qDebug() << "Couldn't connect to" << identifier;

    88                 continue;

    89             }

    90 

    91             // Since we're adding a sensor we can go ahead and add the type (unless it has

    92             // already been added).

    93             if (!added) {

    94                 qDebug() << "Adding type" << type;

    95                 m_sensors->addTopLevelItem(typeItem);

    96                 added = true;

    97             }

    98             qDebug() << "Adding identifier" << identifier;

    99             (void)new QTreeWidgetItem(typeItem, QStringList() << QString::fromLatin1(identifier));

   100         }

   101         // Cleanup if we didn't add the type

   102         if (!added) {

   103             qDebug() << "Didn't add type" << type;

   104             delete typeItem;

   105         }

   106     }

   107 

   108     // Don't hide stuff

   109     m_sensors->expandAll();

   110 }

   111 

   112 void Explorer::clearReading()

   113 {

   114     m_reading->setRowCount(0);

   115 }

   116 

   117 void Explorer::loadReading()

   118 {

   119     qDebug() << "Explorer::loadReading";

   120 

   121     // Clear out anything that's in there now

   122     clearReading();

   123 

   124     // Check that we've selected an item

   125     QTreeWidgetItem *item = m_sensors->currentItem();

   126     if (!item) {

   127         qWarning() << "Didn't select an item!";

   128         return;

   129     }

   130 

   131     // Check that we've selected a sensor (which has a parent)

   132     QTreeWidgetItem *parent = item->parent();

   133     if (!parent) {

   134         qWarning() << "Didn't select a sensor!";

   135         return;

   136     }

   137 

   138     QByteArray type = parent->data(0, Qt::DisplayRole).toString().toLatin1();

   139     QByteArray identifier = item->data(0, Qt::DisplayRole).toString().toLatin1();

   140 

   141     // Connect to the sensor so we can probe it

   142     QSensor sensor;

   143     sensor.setType(type);

   144     sensor.setIdentifier(identifier);

   145     if (!sensor.connect()) {

   146         qWarning() << "Can't connect to the sensor!";

   147         return;

   148     }

   149 

   150     // Probe the reading using Qt's meta-object facilities

   151     QSensorReading *reading = sensor.reading();

   152     const QMetaObject *mo = reading->metaObject();

   153     int firstProperty = QSensorReading::staticMetaObject.propertyOffset();

   154 

   155     m_reading->setRowCount(mo->propertyCount() - firstProperty);

   156 

   157     for(int i = firstProperty; i < mo->propertyCount(); ++i) {

   158         int row = i - firstProperty;

   159         QTableWidgetItem *index;

   160         if (row == 0)

   161             // timestamp is not available via index

   162             index = new QTableWidgetItem(QLatin1String("N/A"));

   163         else

   164             index = new QTableWidgetItem(QVariant(row - 1).toString());

   165         QTableWidgetItem *prop = new QTableWidgetItem(mo->property(i).name());

   166         QTableWidgetItem *type = new QTableWidgetItem(mo->property(i).typeName());

   167         m_reading->setItem(row, 0, index);

   168         m_reading->setItem(row, 1, prop);

   169         m_reading->setItem(row, 2, type);

   170     }

   171 

   172     adjustReadingColumns();

   173 }

   174 

   175 void Explorer::showEvent(QShowEvent *event)

   176 {

   177     // Once we're visible, load the sensors

   178     // (don't delay showing the UI while we load plugins, connect to backends, etc.)

   179     QTimer::singleShot(0, this, SLOT(loadSensors()));

   180 

   181     QMainWindow::showEvent(event);

   182 }

   183 

   184 // Resize columns to fit the space.

   185 // This shouldn't be so hard!

   186 void Explorer::adjustReadingColumns()

   187 {

   188     // At least this is easy to do

   189     m_reading->resizeColumnsToContents();

   190 

   191     int indexWidth = m_reading->columnWidth(0);

   192     int propWidth = m_reading->columnWidth(1);

   193     int typeWidth = m_reading->columnWidth(2);

   194 

   195     int suggestedWidth = indexWidth + propWidth + typeWidth;

   196     int actualWidth = m_reading->size().width();

   197     //qDebug() << "suggestedWidth" << suggestedWidth << "actualWidth" << actualWidth;

   198 

   199     // We only scale the columns up, we don't scale down

   200     if (actualWidth <= suggestedWidth)

   201         return;

   202 

   203     qreal multiplier = actualWidth / static_cast<qreal>(suggestedWidth);

   204     indexWidth = multiplier * indexWidth;

   205     propWidth = multiplier * propWidth;

   206     typeWidth = multiplier * typeWidth;

   207 

   208     // It ends up too big due to cell decorations or something.

   209     // Make things smaller one pixel at a time in round robin fashion until we're good.

   210     int currentSpace = indexWidth + propWidth + typeWidth + 4;

   211     while (actualWidth < currentSpace) {

   212         if (actualWidth < currentSpace) {

   213             --indexWidth;

   214             --currentSpace;

   215         }

   216         if (actualWidth < currentSpace) {

   217             --propWidth;

   218             --currentSpace;

   219         }

   220         if (actualWidth < currentSpace) {

   221             --typeWidth;

   222             --currentSpace;

   223         }

   224     }

   225 

   226     m_reading->setColumnWidth(0, indexWidth);

   227     m_reading->setColumnWidth(1, propWidth);

   228     m_reading->setColumnWidth(2, typeWidth);

   229 }

   230 

   231 bool Explorer::eventFilter(QObject *obj, QEvent *event)

   232 {

   233     if (obj == m_reading && event->type() == QEvent::Resize) {

   234         // If the table resizes, adjust the column sizes automatically

   235         adjustReadingColumns();

   236     }

   237 

   238     return QMainWindow::eventFilter(obj, event);

   239 }

   240