added temporal vcr widget

src/app/qgisapp.cpp

@@ -364,6 +364,7 @@ Q_GUI_EXPORT extern int qt_defaultDpiX();
 #include "qgslocaldefaultsettings.h"
 #include "qgsbearingnumericformat.h"
 #include "qgsprojectdisplaysettings.h"
+#include "qgstemporalvcrdockwidget.h"
 
 #include "qgsuserprofilemanager.h"
 #include "qgsuserprofile.h"
@@ -1152,6 +1153,11 @@ QgisApp::QgisApp( QSplashScreen *splash, bool restorePlugins, bool skipVersionCh
   mBrowserWidget->setObjectName( QStringLiteral( "Browser" ) );
   mBrowserWidget->setMessageBar( mInfoBar );
 
+  mTemporalVcrWidget = new QgsTemporalVcrDockWidget( tr( "Temporal VCR" ), this );
+  mTemporalVcrWidget->setObjectName( QStringLiteral( "Temporal VCR" ) );
+  addDockWidget( Qt::BottomDockWidgetArea, mTemporalVcrWidget );
+  mTemporalVcrWidget->hide();
+
   QgsGui::instance()->dataItemGuiProviderRegistry()->addProvider( new QgsAppDirectoryItemGuiProvider() );
   QgsGui::instance()->dataItemGuiProviderRegistry()->addProvider( new QgsProjectHomeItemGuiProvider() );
   QgsGui::instance()->dataItemGuiProviderRegistry()->addProvider( new QgsProjectItemGuiProvider() );

src/app/qgisapp.h

@@ -119,6 +119,7 @@ class QgsAdvancedDigitizingDockWidget;
 class QgsGpsInformationWidget;
 class QgsStatisticalSummaryDockWidget;
 class QgsMapCanvasTracer;
+class QgsTemporalVcrDockWidget;
 
 class QgsDecorationItem;
 class QgsMessageLogViewer;

src/core/CMakeLists.txt

@@ -383,6 +383,7 @@ SET(QGIS_CORE_SRCS
   qgsstringutils.cpp
   qgstablecell.cpp
   qgstaskmanager.cpp
+  qgstemporalnavigationobject.cpp
   qgstemporalproperty.cpp
   qgstemporalrangeobject.cpp
   qgstessellator.cpp
@@ -904,6 +905,7 @@ SET(QGIS_CORE_HDRS
   qgsstringutils.h
   qgstablecell.h
   qgstaskmanager.h
+  qgstemporalnavigationobject.h
   qgstemporalproperty.h
   qgstemporalrangeobject.h
   qgstessellator.h

src/core/qgstemporalnavigationobject.cpp

@@ -0,0 +1,187 @@
+/***************************************************************************
+                         qgstemporalnavigationobject.cpp
+                         ---------------
+    begin                : March 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 "qgstemporalnavigationobject.h"
+#include "qgsproject.h"
+#include "qgsprojecttimesettings.h"
+#include "qgsmaplayer.h"
+#include "qgsrasterlayer.h"
+
+QgsTemporalNavigationObject::QgsTemporalNavigationObject()
+{
+}
+
+QDateTime QgsTemporalNavigationObject::addToDateTime( QDateTime datetime, QString time, int value )
+{
+  if ( time == QString( "Minutes" ) )
+  {
+    return datetime.addSecs( value * 60 );
+  }
+  if ( time == QString( "Hours" ) )
+  {
+    return datetime.addSecs( value * 3600 );
+  }
+  if ( time == QString( "Days" ) )
+  {
+    return datetime.addDays( value );
+  }
+  if ( time == QString( "Months" ) )
+  {
+    return datetime.addMonths( value );
+  }
+  if ( time == QString( "Years" ) )
+  {
+    return datetime.addYears( value );
+  }
+
+  return datetime;
+}
+
+void QgsTemporalNavigationObject::updateLayersTemporalRange( QDateTime datetime, QString time, int value )
+{
+  const QMap<QString, QgsMapLayer *> &mapLayers = QgsProject::instance()->mapLayers();
+  QgsMapLayer *currentLayer = nullptr;
+
+  for ( QMap<QString, QgsMapLayer *>::const_iterator it = mapLayers.constBegin(); it != mapLayers.constEnd(); ++it )
+  {
+    currentLayer = it.value();
+    if ( !mPlayActive )
+      break;
+    if ( currentLayer->type() == QgsMapLayerType::RasterLayer &&
+         currentLayer->dataProvider() &&
+         currentLayer->dataProvider()->temporalCapabilities() )
+    {
+      QgsRasterLayer *rasterLayer = qobject_cast<QgsRasterLayer *>( currentLayer );
+      if ( rasterLayer && rasterLayer->dataProvider() &&
+           rasterLayer->dataProvider()->temporalCapabilities() &&
+           rasterLayer->dataProvider()->temporalCapabilities()->isActive() )
+      {
+        QgsDateTimeRange range = rangeFromMode( rasterLayer, datetime, time, value );
+        if ( range.begin().isValid() && range.end().isValid() )
+        {
+          rasterLayer->dataProvider()->temporalCapabilities()->setTemporalRange( range );
+          rasterLayer->triggerRepaint();
+        }
+      }
+    }
+  }
+}
+
+QgsDateTimeRange QgsTemporalNavigationObject::rangeFromMode( QgsMapLayer *layer, QDateTime dateTime, QString time, int value  )
+{
+  QgsRasterLayer *rasterLayer = qobject_cast<QgsRasterLayer *>( layer );
+  QList<QDateTime> availableTimes;
+
+  if ( rasterLayer &&
+       rasterLayer->dataProvider() &&
+       rasterLayer->dataProvider()->temporalCapabilities()
+     )
+    availableTimes = rasterLayer->dataProvider()->temporalCapabilities()->dateTimes();
+
+  if ( mode() == Mode::Snapshot )
+  {
+    if ( availableTimes.contains( dateTime ) )
+      return QgsDateTimeRange( dateTime,  dateTime );
+    else
+      return QgsDateTimeRange();
+  }
+
+  if ( mode() == Mode::Composite )
+  {
+    QDateTime endDateTime = addToDateTime( dateTime, time, value );
+    return QgsDateTimeRange( dateTime,  endDateTime );
+  }
+
+  if ( mode() == Mode::NearestPreviousProduct )
+  {
+    if ( availableTimes.contains( dateTime ) )
+      return QgsDateTimeRange( dateTime,  dateTime );
+    else
+    {
+      QDateTime nearest = lessNearestDateTime( availableTimes, dateTime );
+      return  QgsDateTimeRange( nearest,  nearest );
+    }
+  }
+
+  return QgsDateTimeRange();
+}
+
+QDateTime QgsTemporalNavigationObject::lessNearestDateTime( QList<QDateTime> dateTimes, QDateTime dateTime )
+{
+  int difference;
+  int lowest = 0;
+  bool found = false;
+  QDateTime result;
+
+  if ( dateTimes.empty() )
+    return dateTime;
+
+  for ( QDateTime currentDateTime : dateTimes )
+  {
+    difference = dateTime.msecsTo( currentDateTime );
+    if ( difference < 0 && difference < lowest )
+    {
+      result = currentDateTime;
+      found = true;
+    }
+  }
+
+  if ( !found )
+    result = dateTimes.at( 0 );
+
+  return result;
+}
+
+void QgsTemporalNavigationObject::setNavigationStatus( NavigationStatus status )
+{
+  mStatus = status;
+}
+
+QgsTemporalNavigationObject::NavigationStatus QgsTemporalNavigationObject::navigationStatus() const
+{
+  return mStatus;
+}
+
+void QgsTemporalNavigationObject::setMode( Mode mode )
+{
+  mMode = mode;
+}
+
+QgsTemporalNavigationObject::Mode QgsTemporalNavigationObject::mode() const
+{
+  return mMode;
+}
+
+QList<QDateTime> QgsTemporalNavigationObject::dateTimes() const
+{
+  return mDateTimes;
+}
+
+void QgsTemporalNavigationObject::setDateTimes( QList<QDateTime> dateTimes )
+{
+  mDateTimes = dateTimes;
+}
+
+void QgsTemporalNavigationObject::setIsPlaying( bool playing )
+{
+    mPlayActive = playing;
+}
+
+bool QgsTemporalNavigationObject::isPlaying() const
+{
+    return mPlayActive;
+}