feat(ui_builders_shared): implement class ScrollbarWheelOnlyScrollArea

scanslicer/ui_builders_shared.py

@@ -71,3 +71,21 @@ def icon_from_svg_data_url(data_url, size=24, color_hex=None, palette=None):
     renderer.render(painter)
     painter.end()
     return QIcon(pixmap)
+
+
+# ScrollbarWheelOnlyScrollArea: class definition for ScanSlicer behavior.
+class ScrollbarWheelOnlyScrollArea(QScrollArea):
+    # wheelEvent: function definition for ScanSlicer behavior.
+    def wheelEvent(self, event):
+        scrollbar = self.verticalScrollBar()
+        if scrollbar is None or not scrollbar.isVisible():
+            event.ignore()
+            return
+
+        global_pos = event.globalPosition().toPoint()
+        scrollbar_rect = QRect(scrollbar.mapToGlobal(QPoint(0, 0)), scrollbar.size())
+        if not scrollbar_rect.contains(global_pos):
+            event.ignore()
+            return
+
+        super().wheelEvent(event)