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/usr/share/pyshared/chaco/selectable_legend.py is in python-chaco 4.1.0-1.

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from chaco.tools.api import SelectTool
from traits.api import List

from legend import Legend

class SelectableLegend(Legend, SelectTool):

    # A list of indices into self._cached_labels that indicates which labels
    # should be rendered in the "selected" style
    selections = List

    # A cached list of tuples (x,y,w,h) of each label's geometry
    _cached_label_dims = List

    #------------------------------------------------------------------------
    # Legend methods
    #------------------------------------------------------------------------

    def _do_layout(self):
        Legend._do_layout(self)
        self._compute_label_dims()

    def _compute_label_dims(self):
        dims = []
        edge_space = self.border_width + self.border_padding
        icon_width, icon_height = self.icon_bounds

        icon_x = self.x + edge_space
        text_x = icon_x + icon_width + self.icon_spacing
        y = self.y2 - edge_space
        for i, label_name in enumerate(self._cached_label_names):
            label_width, label_height = self._cached_label_sizes[i]
            y -= label_height
            icon_y = y + (label_height - icon_height) / 2
            dims.append((icon_x, icon_y, icon_width + self.icon_spacing + label_width,
                         label_height))
            y -= self.line_spacing
        self._cached_label_dims = dims

    #------------------------------------------------------------------------
    # SelectTool interface
    #------------------------------------------------------------------------

    def _get_selection_state(self, event):
        for ndx, dims in enumerate(self._cached_label_dims):
            x, y, w, h = dims
            if (x <= event.x <= x+w) and (y <= event.y <= y+h):
                return (ndx in self.selections), True
        else:
            if len(self._cached_label_dims) > 0:
                return (ndx in self.selections), False
            else:
                return False, False

    def _get_selection_token(self, event):
        for ndx, dims in enumerate(self._cached_label_dims):
            x, y, w, h = dims
            if (x <= event.x <= x+w) and (y <= event.y <= y+h):
                return ndx
        else:
            return None

    def _select(self, index, append=True):
        if append:
            self.selections.append(index)
        else:
            self.selections = [index]
        return

    def _deselect(self, index=None):
        if index in self.selections:
            self.selections.remove(index)
        return