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# Copyright (c) 2007, Enthought, Inc.
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""" Demonstrates how to use the Dynamic Views facility.
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import Bool, HasTraits, Str, Instance, Button
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import View, HGroup, Group, Item, Handler, Label, spring
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from traits.has_dynamic_views \
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import DynamicView, HasDynamicViews
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class HasFooView ( HasDynamicViews ):
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""" A base class declaring the existence of the 'foo' dynamic view.
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def __init__ ( self, *args, **traits ):
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Extended to declare our dynamic foo view.
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super( HasFooView, self ).__init__( *args, **traits )
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# Declare and add our dynamic view:
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declaration = DynamicView(
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id = 'traitsui.demos.dynamic_views',
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use_as_default = True,
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self.declare_dynamic_view( declaration )
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class MyInfoHandler ( Handler ):
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def object_first_changed ( self, info ):
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info.object.derived = info.object.first
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class BaseFoo ( HasFooView ):
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""" A base class that puts some content in the 'foo' dynamic view.
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first = Str( 'My first name' )
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last = Str( 'My last name' )
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# A derived trait set by the handler associated with out dynamic view
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Item(label='On this tab, notice how the sub-handler keeps\n'
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'the derived value equal to the first name.\n\n'
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'On the next tab, change the selection in order to\n'
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'control which tabs are visible when the ui is \n'
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'displayed for the 2nd time.'
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_foo_handler = MyInfoHandler(),
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class FatherInfoHandler ( Handler ):
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def object_father_first_name_changed ( self, info ):
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info.object.father_derived = info.object.father_first_name
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class DerivedFoo ( BaseFoo ):
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""" A derived class that puts additional content in the 'foo' dynamic view.
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Note that the additional content could also have been added via a traits
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category contribution, or even dynamic manipulation of metadata on a UI
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subelement. The key is what the metadata represents when the view is
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knows_mother = Bool( False )
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mother_first_name = Str( "My mother's first name" )
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mother_last_name = Str( "My mother's last name" )
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knows_father = Bool( True )
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father_first_name = Str( "My father's first name" )
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father_last_name = Str( "My father's last name" )
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label = "Mother's Info",
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label = "Father's Info",
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_foo_handler = FatherInfoHandler(),
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def _knows_mother_changed ( self, old, new ):
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ui_mother = self.trait_view( 'ui_mother' )
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ui_mother._foo_order = 10
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elif hasattr( ui_mother, '_foo_order' ):
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del ui_mother._foo_order
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def _knows_father_changed ( self, old, new ):
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ui_father = self.trait_view( 'ui_father' )
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ui_father._foo_order = 15
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elif hasattr( ui_father, '_foo_order' ):
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del ui_father._foo_order
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class FooDemo ( HasTraits ):
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""" Defines a class to run the demo.
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foo = Instance( DerivedFoo, () )
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configure = Button( 'Configure' )
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Label( "Try configuring several times, each time changing the items "
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"on the 'Parents?' tab." ),
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HGroup( spring, Item( 'configure', show_label = False ) )
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def _configure_changed ( self ):
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self.foo.configure_traits()
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# Run the demo (if invoked from the command line):
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if __name__ == '__main__':
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popup.configure_traits()
added
removed
examples/demo/Advanced/Dynamic_views_demo.py
