viewer user-APIs exposing zoom/limit options

jdaviz/configs/cubeviz/plugins/viewers.py

@@ -4,6 +4,7 @@
 from bqplot import Lines
 from glue_jupyter.bqplot.image import BqplotImageView
 
+from jdaviz.core.astrowidgets_api import AstrowidgetsImageViewerMixin
 from jdaviz.core.registries import viewer_registry
 from jdaviz.core.marks import SliceIndicatorMarks, ShadowSpatialSpectral
 from jdaviz.configs.cubeviz.helper import layer_is_cube_image_data
@@ -16,7 +17,7 @@
 
 
 @viewer_registry("cubeviz-image-viewer", label="Image 2D (Cubeviz)")
-class CubevizImageView(JdavizViewerMixin, BqplotImageView):
+class CubevizImageView(JdavizViewerMixin, BqplotImageView, AstrowidgetsImageViewerMixin):
     # categories: zoom resets, (zoom, pan), subset, select tools, shortcuts
     # NOTE: zoom and pan are merged here for space consideration and to avoid
     # overflow to second row when opening the tray

jdaviz/configs/default/plugins/viewers.py

@@ -1,4 +1,5 @@
 import numpy as np
+from echo import delay_callback
 
 from glue.viewers.scatter.state import ScatterLayerState as BqplotScatterLayerState
 from glue_jupyter.bqplot.profile import BqplotProfileView
@@ -7,7 +8,9 @@
 
 from jdaviz.configs.imviz.helper import layer_is_image_data
 from jdaviz.components.toolbar_nested import NestedJupyterToolbar
+from jdaviz.core.astrowidgets_api import AstrowidgetsImageViewerMixin
 from jdaviz.core.registries import viewer_registry
+from jdaviz.core.user_api import ViewerUserApi
 from jdaviz.utils import ColorCycler, get_subset_type
 
 __all__ = ['JdavizViewerMixin']
@@ -30,6 +33,25 @@ def __init__(self, *args, **kwargs):
         # Allow each viewer to cycle through colors for each new addition to the viewer:
         self.color_cycler = ColorCycler()
 
+    @property
+    def user_api(self):
+        if isinstance(self, AstrowidgetsImageViewerMixin):
+            expose = ['zoom', 'zoom_level']
+        else:
+            expose = ['set_lims']
+        return ViewerUserApi(self, expose=expose)
+
+    def set_lims(self, x_min=None, x_max=None, y_min=None, y_max=None):
+        with delay_callback(self.state, 'x_min', 'x_max', 'y_min', 'y_max'):
+            if x_min is not None:
+                self.state.x_min = x_min
+            if x_max is not None:
+                self.state.x_max = x_max
+            if y_min is not None:
+                self.state.y_min = y_min
+            if y_max is not None:
+                self.state.y_max = y_max
+
     @property
     def native_marks(self):
         """

jdaviz/core/helpers.py

@@ -122,6 +122,19 @@ def plugins(self):
         return {item['label']: widget_serialization['from_json'](item['widget'], None).user_api
                 for item in self.app.state.tray_items}
 
+    @property
+    def viewers(self):
+        """
+        Access API objects for any viewer.
+
+        Returns
+        -------
+        viewers : dict
+            dict of viewer objects
+        """
+        return {getattr(viewer, 'reference', k): viewer.user_api
+                for k, viewer in self.app._viewer_store.items()}
+
     @property
     def fitted_models(self):
         """

jdaviz/core/user_api.py

@@ -1,6 +1,6 @@
 import astropy.units as u
 
-__all__ = ['UserApiWrapper', 'PluginUserApi']
+__all__ = ['UserApiWrapper', 'PluginUserApi', 'ViewerUserApi']
 
 _internal_attrs = ('_obj', '_expose', '_readonly', '__doc__')
 
@@ -96,3 +96,20 @@ def __init__(self, plugin, expose=[], readonly=[]):
 
     def __repr__(self):
         return f'<{self._obj._registry_label} API>'
+
+
+class ViewerUserApi(UserApiWrapper):
+    """
+    This is an API wrapper around a viewer.  For a full list of attributes/methods,
+    call dir(viewer_object) and for help on any of those methods,
+    call help(viewer_object.attribute).
+
+    For example::
+      help(viewer_object.show)
+    """
+    def __init__(self, viewer, expose=[], readonly=[]):
+        expose = list(set(list(expose) + []))
+        super().__init__(viewer, expose, readonly)
+
+    def __repr__(self):
+        return f'<{self._obj.reference} API>'