change zoom factor value to percent

src/app/qgsoptions.cpp

@@ -714,7 +714,7 @@ QgsOptions::QgsOptions( QWidget *parent, Qt::WindowFlags fl, const QList<QgsOpti
   }
   leTemplateFolder->setText( templateDirName );
 
-  spinZoomFactor->setValue( mSettings->value( QStringLiteral( "/qgis/zoom_factor" ), 2 ).toDouble() );
+  setZoomFactorValue();
 
   // predefined scales for scale combobox
   QString myPaths = mSettings->value( QStringLiteral( "Map/scales" ), PROJECT_SCALES ).toString();
@@ -1347,7 +1347,7 @@ void QgsOptions::saveOptions()
   mSettings->setValue( QStringLiteral( "/qgis/default_measure_color_green" ), myColor.green() );
   mSettings->setValue( QStringLiteral( "/qgis/default_measure_color_blue" ), myColor.blue() );
 
-  mSettings->setValue( QStringLiteral( "/qgis/zoom_factor" ), spinZoomFactor->value() );
+  mSettings->setValue( QStringLiteral( "/qgis/zoom_factor" ), zoomFactorValue() );
 
   //digitizing
   mSettings->setValue( QStringLiteral( "/qgis/digitizing/line_width" ), mLineWidthSpinBox->value() );
@@ -2300,3 +2300,27 @@ void QgsOptions::scaleItemChanged( QListWidgetItem *changedScaleItem )
   addScaleToScaleList( changedScaleItem );
   mListGlobalScales->setCurrentItem( changedScaleItem );
 }
+
+double QgsOptions::zoomFactorValue()
+{
+  // Get the decimal value for zoom factor. This function is needed because the zoom factor spin box is shown as a percent value.
+  // The minimum zoom factor value is 1.01
+  if ( spinZoomFactor->value() == spinZoomFactor->minimum() )
+    return 1.01;
+  else
+    return spinZoomFactor->value() / 100.0;
+}
+
+void QgsOptions::setZoomFactorValue()
+{
+  // Set the percent value for zoom factor spin box. This function is for converting the decimal zoom factor value in the qgis setting to the percent zoom factor value.
+  if ( mSettings->value( QStringLiteral( "/qgis/zoom_factor" ), 2 ) <= 1.01 )
+  {
+    spinZoomFactor->setValue( spinZoomFactor->minimum() );
+  }
+  else
+  {
+    int percentValue = mSettings->value( QStringLiteral( "/qgis/zoom_factor" ), 2 ).toInt() * 100;
+    spinZoomFactor->setValue( percentValue );
+  }
+}

src/app/qgsoptions.h

@@ -228,6 +228,8 @@ class APP_EXPORT QgsOptions : public QgsOptionsDialogBase, private Ui::QgsOption
     void saveContrastEnhancement( QComboBox *cbox, const QString &name );
     void initMinMaxLimits( QComboBox *cbox, const QString &name, const QString &defaultVal );
     void saveMinMaxLimits( QComboBox *cbox, const QString &name );
+    void setZoomFactorValue();
+    double zoomFactorValue();
     QgsCoordinateReferenceSystem mDefaultCrs;
     QgsCoordinateReferenceSystem mLayerDefaultCrs;
     bool mLoadedGdalDriverList;

src/ui/qgsoptionsbase.ui

@@ -3440,15 +3440,21 @@
                    </widget>
                   </item>
                   <item row="0" column="1">
-                   <widget class="QDoubleSpinBox" name="spinZoomFactor">
-                    <property name="decimals">
-                     <number>1</number>
+                   <widget class="QSpinBox" name="spinZoomFactor">
+                    <property name="suffix">
+                     <string>%</string>
                     </property>
                     <property name="minimum">
-                     <double>1.100000000000000</double>
+                     <number>100</number>
+                    </property>
+                    <property name="maximum">
+                     <number>999999999</number>
+                    </property>
+                    <property name="singleStep">
+                     <number>100</number>
                     </property>
                     <property name="value">
-                     <double>2.000000000000000</double>
+                     <number>200</number>
                     </property>
                    </widget>
                   </item>