From 2d47eaf8c7cc754323a8a9a7d9a3bd83ada4f3cd Mon Sep 17 00:00:00 2001
From: Sergey Yaroslavtsev <sergey.yaroslavtsev@esrf.fr>
Date: Mon, 27 Apr 2026 21:44:12 +0200
Subject: [PATCH] switch to last slice on autorefresh for 3D images

---
 src/PyMca5/PyMcaGui/io/hdf5/QNexusWidget.py   |  9 +++++++--
 src/PyMca5/PyMcaGui/pymca/PyMcaImageWindow.py | 10 ++++++++++
 src/PyMca5/PyMcaGui/pymca/PyMcaMain.py        |  2 +-
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/PyMca5/PyMcaGui/io/hdf5/QNexusWidget.py b/src/PyMca5/PyMcaGui/io/hdf5/QNexusWidget.py
index 4229eeede..0d7adfe15 100644
--- a/src/PyMca5/PyMcaGui/io/hdf5/QNexusWidget.py
+++ b/src/PyMca5/PyMcaGui/io/hdf5/QNexusWidget.py
@@ -514,7 +514,7 @@ def dataSourceDestroyed(weakrefReference):
             if hasattr(self.hdf5Widget, "expandToDepth"):
                 self.hdf5Widget.expandToDepth(0)
 
-    def _autoRefreshDatasets(self, source=None):
+    def _autoRefreshDatasets(self, source=None, moveToLastSlice=True):
         """
         Auto-refresh: re-read datasets and re-plot without re-building the tree.
         The tree remains fully interactive (click, select, expand).
@@ -552,7 +552,10 @@ def _autoRefreshDatasets(self, source=None):
 
         # Replot with the cached entry list (always REPLACE).
         _, selType = self._lastAction.split()
-        ddict = {'action': 'REPLACE %s' % selType}
+        ddict = {
+            'action': 'REPLACE %s' % selType,
+            'refreshtolastslice': moveToLastSlice,
+        }
         self.buttonsSlot(ddict, emit=True,
                          entryList=self._autoRefreshEntries)
 
@@ -1176,6 +1179,7 @@ def buttonsSlot(self, ddict, emit=True, entryList=None):
                 sel['selection']['LabelNames'] = cntSelection['aliaslist']
                 #sel['selection']['aliaslist'] = cntSelection['aliaslist']
                 sel['selection']['selectiontype'] = selectionType
+                sel['refreshtolastslice'] = ddict.get('refreshtolastslice', False)
                 if selectionType.upper() == "SCAN":
                     if cntSelection['cntlist'][yCnt].startswith("/"):
                         actualDatasetPath = posixpath.join(entry,
@@ -1355,6 +1359,7 @@ def buttonsSlot(self, ddict, emit=True, entryList=None):
                 sel['selection']['cntlist'] = cntSelection['cntlist']
                 sel['selection']['LabelNames'] = cntSelection['aliaslist']
                 sel['selection']['selectiontype'] = selectionType
+                sel['refreshtolastslice'] = ddict.get('refreshtolastslice', False)
                 sel['selection']['plot_yaxis'] = 'right'
                 if selectionType.upper() == "SCAN":
                     sel['scanselection'] = True
diff --git a/src/PyMca5/PyMcaGui/pymca/PyMcaImageWindow.py b/src/PyMca5/PyMcaGui/pymca/PyMcaImageWindow.py
index 3ad485758..b8d9cc0a6 100644
--- a/src/PyMca5/PyMcaGui/pymca/PyMcaImageWindow.py
+++ b/src/PyMca5/PyMcaGui/pymca/PyMcaImageWindow.py
@@ -251,9 +251,19 @@ def _addSelection(self, selectionlist):
                 self.slider.setValue(0)
                 self.slider.show()
                 self.setName(legend+" 0")
+                if sel.get("refreshtolastslice", False) and self._nImages > 1:
+                    self._showLastImageSlice()
             if self._plotEnabled:
                 self.plotImage(True)
 
+    def _showLastImageSlice(self):
+        if USE_BROWSER:
+            # Reuse the existing method from FrameBrowser.
+            self.slider._browser._lastClicked()
+        else:
+            # simply set slider to last number possible.
+            self.slider.setValue(self._nImages - 1)
+
     def _getAxesLabelsFromSelection(self, selection):
         labels = []
         if "x" in selection:
diff --git a/src/PyMca5/PyMcaGui/pymca/PyMcaMain.py b/src/PyMca5/PyMcaGui/pymca/PyMcaMain.py
index d62b3b33a..531bf8f11 100644
--- a/src/PyMca5/PyMcaGui/pymca/PyMcaMain.py
+++ b/src/PyMca5/PyMcaGui/pymca/PyMcaMain.py
@@ -446,7 +446,7 @@ def _dispatcherAddSelectionSlot(self, dictOrList):
                 self.imageWindowDict[legend]._addSelection(ddict)
             return
         elif self._is2DSelection(ddict):
-            _logger.info("2D selection")
+            _logger.debug("2D selection")
             if self.imageWindowCorrelator is None:
                 self.imageWindowCorrelator = RGBCorrelator.RGBCorrelator()
                 #toadd = True