[feature] Save the "Show only selected point" options of the spreadheet

The option is saved in the settings and reapply everytime the spreadsheet is opened
When we open Veloview for the first time this option is set to false
This avoid having an empty spreadsheet an misleading the user.

ApplicationComponents/lqSpreadSheetManager.cxx

@@ -18,12 +18,22 @@
 #include <pqApplicationCore.h>
 #include <pqActiveObjects.h>
 
+#include <vtkEventQtSlotConnect.h>
+#include "vtkSMProperty.h"
+#include <vtkSMPropertyHelper.h>
+#include <vtkSMViewProxy.h>
+
 #include <assert.h>
 
 //-----------------------------------------------------------------------------
 lqSpreadSheetManager::lqSpreadSheetManager(QObject* parent) : QObject(parent)
 {
   this->Settings = pqApplicationCore::instance()->settings();
+
+  // we disable the "show only selection" because otherwise if you quit LidarView with this option ON
+  // when you will open Lidarview again the Spreadsheet will be empty because no points are selected.
+  // This can be misleading for the user so we set this property to false on opening of lidarview
+  this->Settings->setValue("ShowOnlySelectedElement", false);
 }
 
 //-----------------------------------------------------------------------------
@@ -66,6 +76,12 @@ void lqSpreadSheetManager::constructSpreadSheet()
   QObject::connect(this->SpreadSheetView, SIGNAL(endRender()), this, SLOT(onSpreadSheetEndRender()));
   QObject::connect(this, SIGNAL(saveColumnSelection()), this, SLOT(onSaveColumnSelection()));
 
+  // Connect the "Selection only" property to a slot to save this property information
+  vtkEventQtSlotConnect* connector = vtkEventQtSlotConnect::New();
+  vtkSMViewProxy* viewModule = this->SpreadSheetView->getViewProxy();
+  connector->Connect(viewModule->GetProperty("SelectionOnly"), vtkCommand::ModifiedEvent,
+    this, SLOT(onSpreadSheetSelectionOnly()));
+
   this->SpreadSheetViewDec = new pqSpreadSheetViewDecorator(this->SpreadSheetView);
   this->SpreadSheetViewDec->setPrecision(3);
   this->SpreadSheetViewDec->setFixedRepresentation(true);
@@ -174,6 +190,7 @@ void lqSpreadSheetManager::onSpreadSheetEndRender()
   conditionnallyHideColumn("Data", "Points_m_XYZ"); // hide dupe of pt coords
   conditionnallyHideColumn("TrailingFrame", "Points_m_XYZ");
 
+  this->restoreShowOnlySelectedElement();
   this->restoreColumnSelection();
 }
 
@@ -240,6 +257,22 @@ void lqSpreadSheetManager::restoreColumnSelection()
   }
 }
 
+//-----------------------------------------------------------------------------
+void lqSpreadSheetManager::onSpreadSheetSelectionOnly()
+{
+  // Save if "Show only selected elements" is enabled
+  int showOnlySelectedElement = vtkSMPropertyHelper(this->SpreadSheetView->getProxy(), "SelectionOnly").GetAsInt();
+  this->Settings->setValue("ShowOnlySelectedElement", showOnlySelectedElement);
+}
+
+//-----------------------------------------------------------------------------
+void lqSpreadSheetManager::restoreShowOnlySelectedElement()
+{
+  int showOnlySelectedElement = this->Settings->value("ShowOnlySelectedElement").toInt();
+  vtkSMPropertyHelper(this->SpreadSheetView->getProxy(), "SelectionOnly").Set(showOnlySelectedElement);
+  this->SpreadSheetView->getProxy()->UpdateProperty("SelectionOnly", true);
+}
+
 //-----------------------------------------------------------------------------
 std::string lqSpreadSheetManager::getCurrentShownObjectName()
 {

ApplicationComponents/lqSpreadSheetManager.h

@@ -49,6 +49,7 @@ protected slots:
   // only the list of hidden columns is saved
   void onSaveColumnSelection();
 
+  void onSpreadSheetSelectionOnly();
 private:
   QDockWidget* spreadSheetDock = nullptr;
   pqRenderView* mainView = nullptr;
@@ -64,6 +65,7 @@ private:
   void conditionnallyHideColumn(const std::string& conditionSrcName,
                                 const std::string& columnName);
   void restoreColumnSelection();
+  void restoreShowOnlySelectedElement();
   std::string getCurrentShownObjectName();
 };