# ===============================================================================
# Copyright 2013 Jake Ross
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ===============================================================================

# ============= enthought library imports =======================
from __future__ import absolute_import
from traits.api import HasTraits, List, on_trait_change, Any
from traitsui.api import View, TableEditor, UItem
from traitsui.extras.checkbox_column import CheckboxColumn
from traitsui.table_column import ObjectColumn

from pychron.canvas.canvas2D.laser_tray_canvas import ImageOverlay


# ============= standard library imports ========================
# ============= local library imports  ==========================


class ImageOverlayManager(HasTraits):
    canvas = Any
    overlays = List

    def set_canvas(self, canvas):
        ov = [o for o in reversed(canvas.overlays) if isinstance(o, ImageOverlay)]
        self.overlays = ov
        self.canvas = canvas

    def traits_view(self):
        cols = [
            ObjectColumn(name="name", label="Name", editable=False),
            CheckboxColumn(name="visible", label="Visible"),
            ObjectColumn(name="alpha", label="Opacity", width=200),
            ObjectColumn(name="dirname", label="Directory", editable=False),
        ]
        v = View(UItem("overlays", editor=TableEditor(columns=cols, sortable=False)))
        return v

    @on_trait_change("overlays:[visible,alpha]")
    def redraw(self, obj, name, old, new):
        self.canvas.request_redraw()


# ============= EOF =============================================
