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"""
Apply / Revert
Provides support in a dialog box for an "Apply" button which modifies the
object being viewed, and a "Revert" button, which returns the object to its
starting state (before any "Apply").
Note that this does not automatically provide a full (multi-step incremental)
Undo capability.
"""
from traits.api import HasTraits, Str, List
from traitsui.api import Item, View, Handler, HGroup, VGroup
# 'ApplyRevert_Handler' class:
class ApplyRevert_Handler(Handler):
def apply(self, info):
object = info.object
object.stack.insert(0, object.input)
object.queue.append(object.input)
def revert(self, info):
# Do something exciting here...
print 'revert called...'
# 'ApplyRevertDemo' class:
class ApplyRevertDemo(HasTraits):
# Trait definitions:
input = Str
stack = List
queue = List
# Traits view definitions:
traits_view = View(
VGroup(
VGroup(
Item('input',
show_label = False
),
label = 'Input',
show_border = True
),
HGroup(
VGroup(
Item('stack',
show_label = False,
height = 50,
width = 100,
style = 'readonly'
),
label = 'Stack',
show_border = True
),
VGroup(
Item('queue',
show_label = False,
height = 50,
width = 100,
style = 'readonly'
),
label = 'Queue',
show_border = True
)
)
),
resizable = True,
height = 300,
title = 'Apply/Revert example',
buttons = [ 'Apply', 'Revert' ],
kind = 'modal',
handler = ApplyRevert_Handler
)
# Create the demo:
modal_popup = ApplyRevertDemo()
# Run the demo (if invoked from the command line):
if __name__ == '__main__':
modal_popup.configure_traits()
|
