diff --git a/fastplotlib/graphics/_base.py b/fastplotlib/graphics/_base.py
index a0b4881fb..eea78142c 100644
--- a/fastplotlib/graphics/_base.py
+++ b/fastplotlib/graphics/_base.py
@@ -8,7 +8,7 @@
from pygfx import WorldObject
-from ._features import GraphicFeature, PresentFeature, GraphicFeatureIndexable
+from ._features import GraphicFeature, PresentFeature, GraphicFeatureIndexable, Deleted
# dict that holds all world objects for a given python kernel/session
# Graphic objects only use proxies to WorldObjects
@@ -45,6 +45,12 @@ def __init_subclass__(cls, **kwargs):
class Graphic(BaseGraphic):
+ feature_events = {}
+
+ def __init_subclass__(cls, **kwargs):
+ # all graphics give off a feature event when deleted
+ cls.feature_events = {*cls.feature_events, "deleted"}
+
def __init__(
self,
name: str = None,
@@ -72,6 +78,8 @@ def __init__(
# store hex id str of Graphic instance mem location
self.loc: str = hex(id(self))
+ self.deleted = Deleted(self, False)
+
@property
def world_object(self) -> WorldObject:
"""Associated pygfx WorldObject. Always returns a proxy, real object cannot be accessed directly."""
@@ -168,6 +176,7 @@ def _cleanup(self):
pass
def __del__(self):
+ self.deleted = True
del WORLD_OBJECTS[self.loc]
diff --git a/fastplotlib/graphics/_features/__init__.py b/fastplotlib/graphics/_features/__init__.py
index a6ce9c3a3..a1769b010 100644
--- a/fastplotlib/graphics/_features/__init__.py
+++ b/fastplotlib/graphics/_features/__init__.py
@@ -5,6 +5,7 @@
from ._thickness import ThicknessFeature
from ._base import GraphicFeature, GraphicFeatureIndexable, FeatureEvent, to_gpu_supported_dtype
from ._selection_features import LinearSelectionFeature, LinearRegionSelectionFeature
+from ._deleted import Deleted
__all__ = [
"ColorFeature",
@@ -23,4 +24,5 @@
"to_gpu_supported_dtype",
"LinearSelectionFeature",
"LinearRegionSelectionFeature",
+ "Deleted",
]
diff --git a/fastplotlib/graphics/_features/_deleted.py b/fastplotlib/graphics/_features/_deleted.py
new file mode 100644
index 000000000..2fca1c719
--- /dev/null
+++ b/fastplotlib/graphics/_features/_deleted.py
@@ -0,0 +1,41 @@
+from ._base import GraphicFeature, FeatureEvent
+
+
+class Deleted(GraphicFeature):
+ """
+ Used when a graphic is deleted, triggers events that can be useful to indicate this graphic has been deleted
+
+ **event pick info:**
+
+ ==================== ======================== =========================================================================
+ key type description
+ ==================== ======================== =========================================================================
+ "collection-index" int the index of the graphic within the collection that triggered the event
+ "world_object" pygfx.WorldObject world object
+ ==================== ======================== =========================================================================
+ """
+
+ def __init__(self, parent, value: bool):
+ super(Deleted, self).__init__(parent, value)
+
+ def _set(self, value: bool):
+ value = self._parse_set_value(value)
+ self._feature_changed(key=None, new_data=value)
+
+ def _feature_changed(self, key, new_data):
+ # this is a non-indexable feature so key=None
+
+ pick_info = {
+ "index": None,
+ "collection-index": self._collection_index,
+ "world_object": self._parent.world_object,
+ "new_data": new_data,
+ }
+
+ event_data = FeatureEvent(type="deleted", pick_info=pick_info)
+
+ self._call_event_handlers(event_data)
+
+ def __repr__(self) -> str:
+ s = f"DeletedFeature for {self._parent}"
+ return s
diff --git a/fastplotlib/graphics/image.py b/fastplotlib/graphics/image.py
index 10f09eefb..3d629c10f 100644
--- a/fastplotlib/graphics/image.py
+++ b/fastplotlib/graphics/image.py
@@ -196,7 +196,7 @@ def _add_plot_area_hook(self, plot_area):
class ImageGraphic(Graphic, Interaction, _AddSelectorsMixin):
- feature_events = ("data", "cmap", "present")
+ feature_events = {"data", "cmap", "present"}
def __init__(
self,
@@ -345,10 +345,11 @@ def col_chunk_index(self, index: int):
class HeatmapGraphic(Graphic, Interaction, _AddSelectorsMixin):
- feature_events = (
+ feature_events = {
"data",
"cmap",
- )
+ "present"
+ }
def __init__(
self,
diff --git a/fastplotlib/graphics/line.py b/fastplotlib/graphics/line.py
index d6f061ab0..9ac7568a7 100644
--- a/fastplotlib/graphics/line.py
+++ b/fastplotlib/graphics/line.py
@@ -12,7 +12,7 @@
class LineGraphic(Graphic, Interaction):
- feature_events = ("data", "colors", "cmap", "thickness", "present")
+ feature_events = {"data", "colors", "cmap", "thickness", "present"}
def __init__(
self,
diff --git a/fastplotlib/graphics/line_collection.py b/fastplotlib/graphics/line_collection.py
index 38597a830..a5c398130 100644
--- a/fastplotlib/graphics/line_collection.py
+++ b/fastplotlib/graphics/line_collection.py
@@ -15,7 +15,7 @@
class LineCollection(GraphicCollection, Interaction):
child_type = LineGraphic.__name__
- feature_events = ("data", "colors", "cmap", "thickness", "present")
+ feature_events = {"data", "colors", "cmap", "thickness", "present"}
def __init__(
self,
diff --git a/fastplotlib/graphics/scatter.py b/fastplotlib/graphics/scatter.py
index 961324c23..63689fad9 100644
--- a/fastplotlib/graphics/scatter.py
+++ b/fastplotlib/graphics/scatter.py
@@ -9,7 +9,7 @@
class ScatterGraphic(Graphic):
- feature_events = ("data", "sizes", "colors", "cmap", "present")
+ feature_events = {"data", "sizes", "colors", "cmap", "present"}
def __init__(
self,
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