qgstemporalcontrollerwidget.cpp

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/***************************************************************************
                         qgstemporalcontrollerwidget.cpp
                         ------------------------------
    begin                : February 2020
    copyright            : (C) 2020 by Samweli Mwakisambwe
    email                : samweli at kartoza dot com
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgsapplication.h"
#include "qgstemporalcontrollerwidget.h"
#include "qgsgui.h"
#include "qgsmaplayermodel.h"
#include "qgsproject.h"
#include "qgsprojecttimesettings.h"
#include "qgstemporalmapsettingswidget.h"
#include "qgstemporalutils.h"
#include "qgsmaplayertemporalproperties.h"
#include "qgsmeshlayer.h"
 
#include <QAction>
#include <QMenu>
 
QgsTemporalControllerWidget::QgsTemporalControllerWidget( QWidget *parent )
  : QgsPanelWidget( parent )
{
  setupUi( this );
 
  mNavigationObject = new QgsTemporalNavigationObject( this );
 
  connect( mForwardButton, &QPushButton::clicked, this, &QgsTemporalControllerWidget::togglePlayForward );
  connect( mBackButton, &QPushButton::clicked, this, &QgsTemporalControllerWidget::togglePlayBackward );
  connect( mStopButton, &QPushButton::clicked, this, &QgsTemporalControllerWidget::togglePause );
  connect( mNextButton, &QPushButton::clicked, mNavigationObject, &QgsTemporalNavigationObject::next );
  connect( mPreviousButton, &QPushButton::clicked, mNavigationObject, &QgsTemporalNavigationObject::previous );
  connect( mFastForwardButton, &QPushButton::clicked, mNavigationObject, &QgsTemporalNavigationObject::skipToEnd );
  connect( mRewindButton, &QPushButton::clicked, mNavigationObject, &QgsTemporalNavigationObject::rewindToStart );
  connect( mLoopingCheckBox, &QCheckBox::toggled, this, [ = ]( bool state ) { mNavigationObject->setLooping( state ); } );
 
  setWidgetStateFromNavigationMode( mNavigationObject->navigationMode() );
  connect( mNavigationObject, &QgsTemporalNavigationObject::navigationModeChanged, this, &QgsTemporalControllerWidget::setWidgetStateFromNavigationMode );
  connect( mNavigationOff, &QPushButton::clicked, this, &QgsTemporalControllerWidget::mNavigationOff_clicked );
  connect( mNavigationFixedRange, &QPushButton::clicked, this, &QgsTemporalControllerWidget::mNavigationFixedRange_clicked );
  connect( mNavigationAnimated, &QPushButton::clicked, this, &QgsTemporalControllerWidget::mNavigationAnimated_clicked );
 
  connect( mNavigationObject, &QgsTemporalNavigationObject::stateChanged, this, [ = ]( QgsTemporalNavigationObject::AnimationState state )
  {
    mForwardButton->setChecked( state == QgsTemporalNavigationObject::Forward );
    mBackButton->setChecked( state == QgsTemporalNavigationObject::Reverse );
    mStopButton->setChecked( state == QgsTemporalNavigationObject::Idle );
  } );
 
  connect( mStartDateTime, &QDateTimeEdit::dateTimeChanged, this, &QgsTemporalControllerWidget::startEndDateTime_changed );
  connect( mEndDateTime, &QDateTimeEdit::dateTimeChanged, this, &QgsTemporalControllerWidget::startEndDateTime_changed );
  connect( mFixedRangeStartDateTime, &QDateTimeEdit::dateTimeChanged, this, &QgsTemporalControllerWidget::fixedRangeStartEndDateTime_changed );
  connect( mFixedRangeEndDateTime, &QDateTimeEdit::dateTimeChanged, this, &QgsTemporalControllerWidget::fixedRangeStartEndDateTime_changed );
  connect( mStepSpinBox, qgis::overload<double>::of( &QDoubleSpinBox::valueChanged ), this, &QgsTemporalControllerWidget::updateFrameDuration );
  connect( mTimeStepsComboBox, qgis::overload<int>::of( &QComboBox::currentIndexChanged ), this, &QgsTemporalControllerWidget::updateFrameDuration );
  connect( mSlider, &QSlider::valueChanged, this, &QgsTemporalControllerWidget::timeSlider_valueChanged );
 
  mStepSpinBox->setClearValue( 1 );
 
  connect( mNavigationObject, &QgsTemporalNavigationObject::updateTemporalRange, this, &QgsTemporalControllerWidget::updateSlider );
 
  connect( mSettings, &QPushButton::clicked, this, &QgsTemporalControllerWidget::settings_clicked );
 
  mMapLayerModel = new QgsMapLayerModel( this );
 
  mRangeMenu.reset( new QMenu( this ) );
 
  mRangeSetToAllLayersAction = new QAction( tr( "Set to Full Range" ), mRangeMenu.get() );
  mRangeSetToAllLayersAction->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "/mActionRefresh.svg" ) ) );
  connect( mRangeSetToAllLayersAction, &QAction::triggered, this, &QgsTemporalControllerWidget::mRangeSetToAllLayersAction_triggered );
  mRangeMenu->addAction( mRangeSetToAllLayersAction );
 
  mRangeSetToProjectAction = new QAction( tr( "Set to Preset Project Range" ), mRangeMenu.get() );
  connect( mRangeSetToProjectAction, &QAction::triggered, this, &QgsTemporalControllerWidget::mRangeSetToProjectAction_triggered );
  mRangeMenu->addAction( mRangeSetToProjectAction );
 
  mRangeMenu->addSeparator();
 
  mRangeLayersSubMenu.reset( new QMenu( tr( "Set to Single Layer's Range" ), mRangeMenu.get() ) );
  mRangeLayersSubMenu->setEnabled( false );
  mRangeMenu->addMenu( mRangeLayersSubMenu.get() );
  connect( mRangeMenu.get(), &QMenu::aboutToShow, this, &QgsTemporalControllerWidget::aboutToShowRangeMenu );
 
  mSetRangeButton->setPopupMode( QToolButton::MenuButtonPopup );
  mSetRangeButton->setMenu( mRangeMenu.get() );
  mSetRangeButton->setDefaultAction( mRangeSetToAllLayersAction );
  mFixedRangeSetRangeButton->setPopupMode( QToolButton::MenuButtonPopup );
  mFixedRangeSetRangeButton->setMenu( mRangeMenu.get() );
  mFixedRangeSetRangeButton->setDefaultAction( mRangeSetToAllLayersAction );
 
  connect( mExportAnimationButton, &QPushButton::clicked, this, &QgsTemporalControllerWidget::exportAnimation );
 
  QgsDateTimeRange range;
 
  if ( QgsProject::instance()->timeSettings() )
    range = QgsProject::instance()->timeSettings()->temporalRange();
 
  mStartDateTime->setDisplayFormat( "yyyy-MM-dd HH:mm:ss" );
  mEndDateTime->setDisplayFormat( "yyyy-MM-dd HH:mm:ss" );
  mFixedRangeStartDateTime->setDisplayFormat( "yyyy-MM-dd HH:mm:ss" );
  mFixedRangeEndDateTime->setDisplayFormat( "yyyy-MM-dd HH:mm:ss" );
 
  if ( range.begin().isValid() && range.end().isValid() )
  {
    whileBlocking( mStartDateTime )->setDateTime( range.begin() );
    whileBlocking( mEndDateTime )->setDateTime( range.end() );
    whileBlocking( mFixedRangeStartDateTime )->setDateTime( range.begin() );
    whileBlocking( mFixedRangeEndDateTime )->setDateTime( range.end() );
  }
 
  for ( QgsUnitTypes::TemporalUnit u :
        {
          QgsUnitTypes::TemporalMilliseconds,
          QgsUnitTypes::TemporalSeconds,
          QgsUnitTypes::TemporalMinutes,
          QgsUnitTypes::TemporalHours,
          QgsUnitTypes::TemporalDays,
          QgsUnitTypes::TemporalWeeks,
          QgsUnitTypes::TemporalMonths,
          QgsUnitTypes::TemporalYears,
          QgsUnitTypes::TemporalDecades,
          QgsUnitTypes::TemporalCenturies
        } )
  {
    mTimeStepsComboBox->addItem( QgsUnitTypes::toString( u ), u );
  }
 
  // TODO: might want to choose an appropriate default unit based on the range
  mTimeStepsComboBox->setCurrentIndex( mTimeStepsComboBox->findData( QgsUnitTypes::TemporalHours ) );
 
  mStepSpinBox->setMinimum( 0.0000001 );
  mStepSpinBox->setMaximum( std::numeric_limits<int>::max() );
  mStepSpinBox->setSingleStep( 1 );
  mStepSpinBox->setValue( 1 );
 
  mForwardButton->setToolTip( tr( "Play" ) );
  mBackButton->setToolTip( tr( "Reverse" ) );
  mNextButton->setToolTip( tr( "Go to next frame" ) );
  mPreviousButton->setToolTip( tr( "Go to previous frame" ) );
  mStopButton->setToolTip( tr( "Pause" ) );
  mRewindButton->setToolTip( tr( "Rewind to start" ) );
  mFastForwardButton->setToolTip( tr( "Fast forward to end" ) );
 
  updateFrameDuration();
 
  connect( QgsProject::instance(), &QgsProject::readProject, this, &QgsTemporalControllerWidget::setWidgetStateFromProject );
  connect( QgsProject::instance(), &QgsProject::layersAdded, this, &QgsTemporalControllerWidget::onLayersAdded );
  connect( QgsProject::instance(), &QgsProject::cleared, this, &QgsTemporalControllerWidget::onProjectCleared );
}
 
void QgsTemporalControllerWidget::keyPressEvent( QKeyEvent *e )
{
  if ( mSlider->hasFocus() && e->key() == Qt::Key_Space )
  {
    togglePause();
  }
  QWidget::keyPressEvent( e );
}
 
void QgsTemporalControllerWidget::aboutToShowRangeMenu()
{
  QgsDateTimeRange projectRange;
  if ( QgsProject::instance()->timeSettings() )
    projectRange = QgsProject::instance()->timeSettings()->temporalRange();
  mRangeSetToProjectAction->setEnabled( projectRange.begin().isValid() && projectRange.end().isValid() );
 
  mRangeLayersSubMenu->clear();
  for ( int i = 0; i < mMapLayerModel->rowCount(); ++i )
  {
    QModelIndex index = mMapLayerModel->index( i, 0 );
    QgsMapLayer *currentLayer = mMapLayerModel->data( index, QgsMapLayerModel::LayerRole ).value<QgsMapLayer *>();
    if ( !currentLayer->temporalProperties() || !currentLayer->temporalProperties()->isActive() )
      continue;
 
    QIcon icon = qvariant_cast<QIcon>( mMapLayerModel->data( index, Qt::DecorationRole ) );
    QString text = mMapLayerModel->data( index, Qt::DisplayRole ).toString();
    QgsDateTimeRange range = currentLayer->temporalProperties()->calculateTemporalExtent( currentLayer );
    if ( range.begin().isValid() && range.end().isValid() )
    {
      QAction *action = new QAction( icon, text, mRangeLayersSubMenu.get() );
      connect( action, &QAction::triggered, this, [ = ]
      {
        setDates( range );
        saveRangeToProject();
      } );
      mRangeLayersSubMenu->addAction( action );
    }
  }
  mRangeLayersSubMenu->setEnabled( !mRangeLayersSubMenu->actions().isEmpty() );
}
 
void QgsTemporalControllerWidget::togglePlayForward()
{
  mPlayingForward = true;
 
  if ( mNavigationObject->animationState() != QgsTemporalNavigationObject::Forward )
  {
    mStopButton->setChecked( false );
    mBackButton->setChecked( false );
    mForwardButton->setChecked( true );
    mNavigationObject->playForward();
  }
  else
  {
    mBackButton->setChecked( true );
    mForwardButton->setChecked( false );
    mNavigationObject->pause();
  }
}
 
void QgsTemporalControllerWidget::togglePlayBackward()
{
  mPlayingForward = false;
 
  if ( mNavigationObject->animationState() != QgsTemporalNavigationObject::Reverse )
  {
    mStopButton->setChecked( false );
    mBackButton->setChecked( true );
    mForwardButton->setChecked( false );
    mNavigationObject->playBackward();
  }
  else
  {
    mBackButton->setChecked( true );
    mBackButton->setChecked( false );
    mNavigationObject->pause();
  }
}
 
void QgsTemporalControllerWidget::togglePause()
{
  if ( mNavigationObject->animationState() != QgsTemporalNavigationObject::Idle )
  {
    mStopButton->setChecked( true );
    mBackButton->setChecked( false );
    mForwardButton->setChecked( false );
    mNavigationObject->pause();
  }
  else
  {
    mBackButton->setChecked( mPlayingForward ? false : true );
    mForwardButton->setChecked( mPlayingForward ? false : true );
    if ( mPlayingForward )
    {
      mNavigationObject->playForward();
    }
    else
    {
      mNavigationObject->playBackward();
    }
  }
}
 
void QgsTemporalControllerWidget::updateTemporalExtent()
{
  QgsDateTimeRange temporalExtent = QgsDateTimeRange( mStartDateTime->dateTime(),
                                    mEndDateTime->dateTime() );
  mNavigationObject->setTemporalExtents( temporalExtent );
  mSlider->setRange( 0, mNavigationObject->totalFrameCount() - 1 );
  mSlider->setValue( 0 );
}
 
void QgsTemporalControllerWidget::updateFrameDuration()
{
  if ( mBlockSettingUpdates )
    return;
 
  // save new settings into project
  QgsProject::instance()->timeSettings()->setTimeStepUnit( static_cast< QgsUnitTypes::TemporalUnit>( mTimeStepsComboBox->currentData().toInt() ) );
  QgsProject::instance()->timeSettings()->setTimeStep( mStepSpinBox->value() );
 
  mNavigationObject->setFrameDuration( QgsInterval( QgsProject::instance()->timeSettings()->timeStep(),
                                       QgsProject::instance()->timeSettings()->timeStepUnit() ) );
  mSlider->setRange( 0, mNavigationObject->totalFrameCount() - 1 );
}
 
void QgsTemporalControllerWidget::setWidgetStateFromProject()
{
  mBlockSettingUpdates++;
  mTimeStepsComboBox->setCurrentIndex( mTimeStepsComboBox->findData( QgsProject::instance()->timeSettings()->timeStepUnit() ) );
  mStepSpinBox->setValue( QgsProject::instance()->timeSettings()->timeStep() );
  mBlockSettingUpdates--;
 
  bool ok = false;
  QgsTemporalNavigationObject::NavigationMode mode = static_cast< QgsTemporalNavigationObject::NavigationMode>( QgsProject::instance()->readNumEntry( QStringLiteral( "TemporalControllerWidget" ),
      QStringLiteral( "/NavigationMode" ), 0, &ok ) );
  if ( ok )
  {
    mNavigationObject->setNavigationMode( mode );
    setWidgetStateFromNavigationMode( mode );
  }
  else
  {
    mNavigationObject->setNavigationMode( QgsTemporalNavigationObject::NavigationOff );
    setWidgetStateFromNavigationMode( QgsTemporalNavigationObject::NavigationOff );
  }
 
  const QString startString = QgsProject::instance()->readEntry( QStringLiteral( "TemporalControllerWidget" ), QStringLiteral( "/StartDateTime" ) );
  const QString endString = QgsProject::instance()->readEntry( QStringLiteral( "TemporalControllerWidget" ), QStringLiteral( "/EndDateTime" ) );
  if ( !startString.isEmpty() && !endString.isEmpty() )
  {
    whileBlocking( mStartDateTime )->setDateTime( QDateTime::fromString( startString, Qt::ISODate ) );
    whileBlocking( mEndDateTime )->setDateTime( QDateTime::fromString( endString, Qt::ISODate ) );
    whileBlocking( mFixedRangeStartDateTime )->setDateTime( QDateTime::fromString( startString, Qt::ISODate ) );
    whileBlocking( mFixedRangeEndDateTime )->setDateTime( QDateTime::fromString( endString, Qt::ISODate ) );
  }
  else
  {
    setDatesToProjectTime();
  }
  updateTemporalExtent();
  updateFrameDuration();
 
  mNavigationObject->setFramesPerSecond( QgsProject::instance()->timeSettings()->framesPerSecond() );
  mNavigationObject->setTemporalRangeCumulative( QgsProject::instance()->timeSettings()->isTemporalRangeCumulative() );
}
 
void QgsTemporalControllerWidget::mNavigationOff_clicked()
{
  QgsProject::instance()->writeEntry( QStringLiteral( "TemporalControllerWidget" ), QStringLiteral( "/NavigationMode" ),
                                      static_cast<int>( QgsTemporalNavigationObject::NavigationOff ) );
 
  mNavigationObject->setNavigationMode( QgsTemporalNavigationObject::NavigationOff );
  setWidgetStateFromNavigationMode( QgsTemporalNavigationObject::NavigationOff );
}
 
void QgsTemporalControllerWidget::mNavigationFixedRange_clicked()
{
  QgsProject::instance()->writeEntry( QStringLiteral( "TemporalControllerWidget" ), QStringLiteral( "/NavigationMode" ),
                                      static_cast<int>( QgsTemporalNavigationObject::FixedRange ) );
 
  mNavigationObject->setNavigationMode( QgsTemporalNavigationObject::FixedRange );
  setWidgetStateFromNavigationMode( QgsTemporalNavigationObject::FixedRange );
}
 
void QgsTemporalControllerWidget::mNavigationAnimated_clicked()
{
  QgsProject::instance()->writeEntry( QStringLiteral( "TemporalControllerWidget" ), QStringLiteral( "/NavigationMode" ),
                                      static_cast<int>( QgsTemporalNavigationObject::Animated ) );
 
  mNavigationObject->setNavigationMode( QgsTemporalNavigationObject::Animated );
  setWidgetStateFromNavigationMode( QgsTemporalNavigationObject::Animated );
}
 
void QgsTemporalControllerWidget::setWidgetStateFromNavigationMode( const QgsTemporalNavigationObject::NavigationMode mode )
{
  mNavigationOff->setChecked( mode == QgsTemporalNavigationObject::NavigationOff );
  mNavigationFixedRange->setChecked( mode  == QgsTemporalNavigationObject::FixedRange );
  mNavigationAnimated->setChecked( mode  == QgsTemporalNavigationObject::Animated );
 
  switch ( mode )
  {
    case QgsTemporalNavigationObject::NavigationOff:
      mNavigationModeStackedWidget->setCurrentIndex( 0 );
      break;
    case QgsTemporalNavigationObject::FixedRange:
      mNavigationModeStackedWidget->setCurrentIndex( 1 );
      break;
    case QgsTemporalNavigationObject::Animated:
      mNavigationModeStackedWidget->setCurrentIndex( 2 );
      break;
  }
}
 
void QgsTemporalControllerWidget::onLayersAdded( const QList<QgsMapLayer *> &layers )
{
  if ( !mHasTemporalLayersLoaded )
  {
    for ( QgsMapLayer *layer : layers )
    {
      if ( layer->temporalProperties() )
      {
        mHasTemporalLayersLoaded |= layer->temporalProperties()->isActive();
 
        if ( !mHasTemporalLayersLoaded )
        {
          connect( layer, &QgsMapLayer::dataSourceChanged, this, [ this, layer ]
          {
            if ( layer->isValid() && layer->temporalProperties()->isActive() && !mHasTemporalLayersLoaded )
            {
              mHasTemporalLayersLoaded = true;
              firstTemporalLayerLoaded( layer );
            }
          } );
        }
 
        firstTemporalLayerLoaded( layer );
      }
    }
  }
}
 
void QgsTemporalControllerWidget::firstTemporalLayerLoaded( QgsMapLayer *layer )
{
  setDatesToProjectTime();
 
  QgsMeshLayer *meshLayer = qobject_cast<QgsMeshLayer *>( layer );
  if ( meshLayer )
    setTimeStep( meshLayer->firstValidTimeStep() );
}
 
void QgsTemporalControllerWidget::onProjectCleared()
{
  mHasTemporalLayersLoaded = false;
 
  mNavigationObject->setNavigationMode( QgsTemporalNavigationObject::NavigationOff );
  setWidgetStateFromNavigationMode( QgsTemporalNavigationObject::NavigationOff );
 
  whileBlocking( mStartDateTime )->setDateTime( QDateTime( QDate::currentDate(), QTime( 0, 0, 0, Qt::UTC ) ) );
  whileBlocking( mEndDateTime )->setDateTime( mStartDateTime->dateTime() );
  whileBlocking( mFixedRangeStartDateTime )->setDateTime( QDateTime( QDate::currentDate(), QTime( 0, 0, 0, Qt::UTC ) ) );
  whileBlocking( mFixedRangeEndDateTime )->setDateTime( mStartDateTime->dateTime() );
  updateTemporalExtent();
  mTimeStepsComboBox->setCurrentIndex( mTimeStepsComboBox->findData( QgsUnitTypes::TemporalHours ) );
  mStepSpinBox->setValue( 1 );
}
 
void QgsTemporalControllerWidget::updateSlider( const QgsDateTimeRange &range )
{
  whileBlocking( mSlider )->setValue( mNavigationObject->currentFrameNumber() );
  updateRangeLabel( range );
}
 
void QgsTemporalControllerWidget::updateRangeLabel( const QgsDateTimeRange &range )
{
  switch ( mNavigationObject->navigationMode() )
  {
    case QgsTemporalNavigationObject::Animated:
      mCurrentRangeLabel->setText( tr( "Frame: %1 to %2" ).arg(
                                     range.begin().toString( "yyyy-MM-dd HH:mm:ss" ),
                                     range.end().toString( "yyyy-MM-dd HH:mm:ss" ) ) );
      break;
    case QgsTemporalNavigationObject::FixedRange:
      mCurrentRangeLabel->setText( tr( "Range: %1 to %2" ).arg(
                                     range.begin().toString( "yyyy-MM-dd HH:mm:ss" ),
                                     range.end().toString( "yyyy-MM-dd HH:mm:ss" ) ) );
      break;
    case QgsTemporalNavigationObject::NavigationOff:
      mCurrentRangeLabel->setText( tr( "Temporal navigation disabled" ) );
      break;
  }
}
 
QgsTemporalController *QgsTemporalControllerWidget::temporalController()
{
  return mNavigationObject;
}
 
void QgsTemporalControllerWidget::settings_clicked()
{
  QgsTemporalMapSettingsWidget *settingsWidget = new QgsTemporalMapSettingsWidget( this );
  settingsWidget->setFrameRateValue( mNavigationObject->framesPerSecond() );
  settingsWidget->setIsTemporalRangeCumulative( mNavigationObject->temporalRangeCumulative() );
 
  connect( settingsWidget, &QgsTemporalMapSettingsWidget::frameRateChanged, this, [ = ]( double rate )
  {
    // save new settings into project
    QgsProject::instance()->timeSettings()->setFramesPerSecond( rate );
    mNavigationObject->setFramesPerSecond( rate );
  } );
 
  connect( settingsWidget, &QgsTemporalMapSettingsWidget::temporalRangeCumulativeChanged, this, [ = ]( bool state )
  {
    // save new settings into project
    QgsProject::instance()->timeSettings()->setIsTemporalRangeCumulative( state );
    mNavigationObject->setTemporalRangeCumulative( state );
  } );
  openPanel( settingsWidget );
}
 
void QgsTemporalControllerWidget::timeSlider_valueChanged( int value )
{
  mNavigationObject->setCurrentFrameNumber( value );
}
 
void QgsTemporalControllerWidget::startEndDateTime_changed()
{
  whileBlocking( mFixedRangeStartDateTime )->setDateTime( mStartDateTime->dateTime() );
  whileBlocking( mFixedRangeEndDateTime )->setDateTime( mEndDateTime->dateTime() );
 
  updateTemporalExtent();
  saveRangeToProject();
}
 
void QgsTemporalControllerWidget::fixedRangeStartEndDateTime_changed()
{
  whileBlocking( mStartDateTime )->setDateTime( mFixedRangeStartDateTime->dateTime() );
  whileBlocking( mEndDateTime )->setDateTime( mFixedRangeEndDateTime->dateTime() );
 
  updateTemporalExtent();
  saveRangeToProject();
}
 
void QgsTemporalControllerWidget::mRangeSetToAllLayersAction_triggered()
{
  setDatesToAllLayers();
  saveRangeToProject();
}
 
void QgsTemporalControllerWidget::setTimeStep( const QgsInterval &timeStep )
{
  if ( ! timeStep.isValid() || timeStep.seconds() <= 0 )
    return;
 
  // Search the time unit the most appropriate :
  // the one that gives the smallest time step value for double spin box with round value (if possible) and/or the less signifiant digits
 
  int selectedUnit = -1;
  int stringSize = std::numeric_limits<int>::max();
  int precision = mStepSpinBox->decimals();
  double selectedValue = std::numeric_limits<double>::max();
  for ( int i = 0; i < mTimeStepsComboBox->count(); ++i )
  {
    QgsUnitTypes::TemporalUnit unit = static_cast<QgsUnitTypes::TemporalUnit>( mTimeStepsComboBox->itemData( i ).toInt() );
    double value = timeStep.seconds() * QgsUnitTypes::fromUnitToUnitFactor( QgsUnitTypes::TemporalSeconds, unit );
    QString string = QString::number( value, 'f', precision );
    string.remove( QRegExp( "0+$" ) ); //remove trailing zero
    string.remove( QRegExp( "[.]+$" ) ); //remove last point if present
 
    if ( value >= 1
         && string.size() <= stringSize // less significant digit than currently selected
         && value < selectedValue ) // less than currently selected
    {
      selectedUnit = i;
      selectedValue = value;
      stringSize = string.size();
    }
    else if ( string != '0'
              && string.size() < precision + 2 //round value (ex: 0.xx with precision=3)
              && string.size() < stringSize ) //less significant digit than currently selected
    {
      selectedUnit = i ;
      selectedValue = value ;
      stringSize = string.size();
    }
  }
 
  if ( selectedUnit >= 0 )
  {
    mStepSpinBox->setValue( selectedValue );
    mTimeStepsComboBox->setCurrentIndex( selectedUnit );
  }
 
  updateFrameDuration();
}
 
void QgsTemporalControllerWidget::mRangeSetToProjectAction_triggered()
{
  setDatesToProjectTime();
  saveRangeToProject();
}
 
void QgsTemporalControllerWidget::setDates( const QgsDateTimeRange &range )
{
  if ( range.begin().isValid() && range.end().isValid() )
  {
    whileBlocking( mStartDateTime )->setDateTime( range.begin() );
    whileBlocking( mEndDateTime )->setDateTime( range.end() );
    whileBlocking( mFixedRangeStartDateTime )->setDateTime( range.begin() );
    whileBlocking( mFixedRangeEndDateTime )->setDateTime( range.end() );
    updateTemporalExtent();
  }
}
 
void QgsTemporalControllerWidget::setDatesToAllLayers()
{
  QgsDateTimeRange range;
  range = QgsTemporalUtils::calculateTemporalRangeForProject( QgsProject::instance() );
  setDates( range );
}
 
void QgsTemporalControllerWidget::setDatesToProjectTime()
{
  QgsDateTimeRange range;
 
  // by default try taking the project's fixed temporal extent
  if ( QgsProject::instance()->timeSettings() )
    range = QgsProject::instance()->timeSettings()->temporalRange();
 
  // if that's not set, calculate the extent from the project's layers
  if ( !range.begin().isValid() || !range.end().isValid() )
  {
    range = QgsTemporalUtils::calculateTemporalRangeForProject( QgsProject::instance() );
  }
 
  setDates( range );
}
 
void QgsTemporalControllerWidget::saveRangeToProject()
{
  QgsProject::instance()->writeEntry( QStringLiteral( "TemporalControllerWidget" ),
                                      QStringLiteral( "/StartDateTime" ), mStartDateTime->dateTime().toTimeSpec( Qt::OffsetFromUTC ).toString( Qt::ISODate ) );
  QgsProject::instance()->writeEntry( QStringLiteral( "TemporalControllerWidget" ),
                                      QStringLiteral( "/EndDateTime" ), mEndDateTime->dateTime().toTimeSpec( Qt::OffsetFromUTC ).toString( Qt::ISODate ) );
}