cursor is cross while making/editing labels, change zoom behaviour, thx @isaacgerg

sloth/gui/annotationscene.py

@@ -142,10 +142,14 @@ class AnnotationScene(QGraphicsScene):
         self._labeltool.currentImageChanged.connect(inserter.imageChange)
         self._inserter = inserter
         LOG.debug("Created inserter for class '%s' with default properties '%s'" % (label_class, default_properties))
+        # Change cursor to cross
+        self.views()[0].viewport().setCursor(Qt.CrossCursor)
+
 
     def onInsertionModeEnded(self):
         if self._inserter is not None:
             self._inserter.abort()
+        self.views()[0].viewport().setCursor(Qt.ArrowCursor)
 
     #
     # common methods

sloth/gui/frameviewer.py

@@ -27,6 +27,11 @@ class GraphicsView(QGraphicsView):
         self._panStartX = -1
         self._panStartY = -1
 
+        # Windows photo viewer like controls
+        self.setRenderHints(QPainter.Antialiasing|QPainter.SmoothPixmapTransform)
+        self.setTransformationAnchor(QGraphicsView.AnchorUnderMouse)
+        self.setDragMode(QGraphicsView.ScrollHandDrag)
+
     def fitInView(self):
         if self.scene() is None:
             return
@@ -207,4 +212,4 @@ class MultiFrameEqualViewer(FrameViewer):
                 self.activateSceneView(index)
 
     def getActiveSceneView(self):
-        return self.scene_views[self.active_scene_view]
+        return self.scene_views[self.active_scene_view]

sloth/items/inserters.py

@@ -146,6 +146,7 @@ class RectItemInserter(ItemInserter):
             self._item = None
 
         self._aiming = True
+        self._scene.views()[0].viewport().setCursor(Qt.CrossCursor)
         event.accept()
 
     def allowOutOfSceneEvents(self):