Added middle mouse scroll holding shift as a way of scrolling through…

… dataset

SPIERSedit/docs/basicconcepts.rst

@@ -95,7 +95,7 @@ mirrored!
 
     Figure 2. The SPIERSedit default window layout. Note that the GUI and layout shown corresponds
     to SPIERS 2.X.X. The GUI for 3.X.X employs a dark theme, and has a slightly modified layout, but
-    all instructions in the documentation applies to 3.X.X.   
+    all instructions in the documentation apply to 3.X.X.
 
 Window Layout, Zoom, and Navigation
 -----------------------------------
@@ -130,13 +130,14 @@ SPIERSedit only displays one image at a time from the dataset. The ','
 through the dataset one slice at time. The *Position in Dataset* slider
 allows the user to move through the dataset at will; the current slice
 number is displayed in the associated spinbox (labelled Slice number in
-Fig. 2); values can be entered in here to jump to slices. The title bar
+Fig. 2); values can be entered in here to jump to slices. Shift and missle mouse
+zoom also allows you to scroll through the dataset. The title bar
 displays the current dataset, and image file path. The *Slice Selector*
 Panel, if visible, will also show the current file, as moving to a slice
 automatically selects it. Note however that changing selections in this
 panel does not move to a different image, but selects images for various
-operations discussed later. Control + mouse scroll modifies the selected
-slice.
+operations discussed later. Control + mouse scroll modifies the slice selected
+in the  *Slice Selector*.
 
 At the top of the window, below the menus, is a permanently visible
 toolbar – this contains buttons for selecting/indicating which of its

SPIERSedit/src/mainwindowimpl.cpp

@@ -587,6 +587,11 @@ void MainWindowImpl:: MouseZoom(int delta)
         if (newRow > SliceSelectorList->count() - 1) newRow = SliceSelectorList->count() - 1;
         SliceSelectorList->setCurrentRow(newRow, QItemSelectionModel::ClearAndSelect);
     }
+    else if (QGuiApplication::keyboardModifiers() == Qt::SHIFT)
+    {
+        CurrentFile += delta / 10;
+        SliderPos->setValue(CurrentFile);
+    }
     else ZoomSlider->setValue(ZoomSlider->value() + delta / 5);
 }