Add isAvailableInScan to check item with other scans

bliss/flint/model/plot_item_model.py

@@ -148,6 +148,21 @@ class CurveItem(plot_model.Item, CurveMixIn):
     def isValid(self):
         return self.__x is not None and self.__y is not None
 
+    def isAvailableInScan(self, scan: scan_model.Scan) -> bool:
+        """Returns true if this item is available in this scan.
+
+        This only imply that the data source is available.
+        """
+        if not self.isValid():
+            return False
+        channel = self.xChannel()
+        if channel.channel(scan) is None:
+            return False
+        channel = self.yChannel()
+        if channel.channel(scan) is None:
+            return False
+        return True
+
     def getScanValidation(self, scan: scan_model.Scan) -> Optional[str]:
         """
         Returns None if everything is fine, else a message to explain the problem.
@@ -229,6 +244,18 @@ class XIndexCurveItem(CurveItem):
         channel = self.yChannel()
         return channel is not None
 
+    def isAvailableInScan(self, scan: scan_model.Scan) -> bool:
+        """Returns true if this item is available in this scan.
+
+        This only imply that the data source is available.
+        """
+        if not self.isValid():
+            return False
+        channel = self.yChannel()
+        if channel.channel(scan) is None:
+            return False
+        return True
+
     def xData(self, scan: scan_model.Scan) -> Optional[scan_model.Data]:
         yData = self.yData(scan)
         if yData is None:

bliss/flint/model/plot_model.py

@@ -381,6 +381,13 @@ class Item(qt.QObject):
         """
         return None
 
+    def isAvailableInScan(self, scan: scan_model.Scan) -> bool:
+        """Returns true if this item is available in this scan.
+
+        This only imply that the data source is available.
+        """
+        return True
+
     def isValidInScan(self, scan: scan_model.Scan) -> bool:
         """Returns true if this item do not have any messages associated with
         the data of this scan."""
@@ -511,6 +518,19 @@ class ChildItem(Item):
     def source(self) -> Optional[Item]:
         return self.__source
 
+    def isAvailableInScan(self, scan: scan_model.Scan) -> bool:
+        """Returns true if this item is available in this scan.
+
+        This only imply that the data source is available.
+        """
+        if not self.isValid():
+            return False
+        source = self.source()
+        if source is not None:
+            if not source.isAvailableInScan(scan):
+                return False
+        return True
+
 
 class ComputableMixIn:
     """This item use the scan data to process result before displaying it."""

bliss/flint/model/plot_state_model.py

@@ -595,6 +595,19 @@ class NormalizedCurveItem(plot_model.ChildItem, plot_item_model.CurveMixIn):
         if eventType == plot_model.ChangeEventType.X_CHANNEL:
             self._emitValueChanged(plot_model.ChangeEventType.X_CHANNEL)
 
+    def isAvailableInScan(self, scan: scan_model.Scan) -> bool:
+        """Returns true if this item is available in this scan.
+
+        This only imply that the data source is available.
+        """
+        if not plot_model.ChildItem.isAvailableInScan(self, scan):
+            return False
+        monitor = self.monitorChannel()
+        if monitor is not None:
+            if monitor.channel(scan) is None:
+                return False
+        return True
+
     def displayName(self, axisName, scan: scan_model.Scan) -> str:
         """Helper to reach the axis display name"""
         sourceItem = self.source()