"""
Demonstrate the CSVListEditor class.<br>
<br>
This editor allows the user to enter a *single* line of input text, containing
comma-separated values (or another separator may be specified). Your program
specifies an element Trait type of Int, Float, Str, Enum, or Range.
"""

from traits.api import HasTraits, List, Int, Float, Enum, Range, Str, Button, \
                            Property
from traitsui.api import View, Item, Label, Heading, VGroup, HGroup, UItem, \
                            spring, TextEditor, CSVListEditor


class Demo(HasTraits):

    list1 = List(Int)

    list2 = List(Float)

    list3 = List(Str, maxlen=3)

    list4 = List(Enum('red', 'green', 'blue', 2, 3))

    list5 = List(Range(low=0.0, high=10.0))

    # 'low' and 'high' are used to demonstrate lists containing dynamic ranges.
    low = Float(0.0)
    high = Float(1.0)

    list6 = List(Range(low=-1.0, high='high'))

    list7 = List(Range(low='low', high='high'))

    pop1 = Button("Pop from first list")

    sort1 = Button("Sort first list")

    # This will be str(self.list1).
    list1str = Property(Str, depends_on='list1')

    traits_view = \
        View(
            HGroup(
                # This VGroup forms the column of CSVListEditor examples.
                VGroup(
                    Item('list1', label="List(Int)",
                        editor=CSVListEditor(ignore_trailing_sep=False),
                        tooltip='options: ignore_trailing_sep=False'),
                    Item('list1', label="List(Int)", style='readonly',
                        editor=CSVListEditor()),
                    Item('list2', label="List(Float)",
                        editor=CSVListEditor(enter_set=True, auto_set=False),
                        tooltip='options: enter_set=True, auto_set=False'),
                    Item('list3', label="List(Str, maxlen=3)",
                        editor=CSVListEditor()),
                    Item('list4',
                         label="List(Enum('red', 'green', 'blue', 2, 3))",
                        editor=CSVListEditor(sep=None),
                        tooltip='options: sep=None'),
                    Item('list5', label="List(Range(low=0.0, high=10.0))",
                        editor=CSVListEditor()),
                    Item('list6', label="List(Range(low=-1.0, high='high'))",
                        editor=CSVListEditor()),
                    Item('list7', label="List(Range(low='low', high='high'))",
                        editor=CSVListEditor()),
                    springy=True,
                ),
                # This VGroup forms the right column; it will display the
                # Python str representation of the lists.
                VGroup(
                    UItem('list1str', editor=TextEditor(),
                                        enabled_when='False', width=240),
                    UItem('list1str', editor=TextEditor(),
                                        enabled_when='False', width=240),
                    UItem('list2', editor=TextEditor(),
                                        enabled_when='False', width=240),
                    UItem('list3', editor=TextEditor(),
                                        enabled_when='False', width=240),
                    UItem('list4', editor=TextEditor(),
                                        enabled_when='False', width=240),
                    UItem('list5', editor=TextEditor(),
                                        enabled_when='False', width=240),
                    UItem('list6', editor=TextEditor(),
                                        enabled_when='False', width=240),
                    UItem('list7', editor=TextEditor(),
                                        enabled_when='False', width=240),
                ),
            ),
            '_',
            HGroup('low', 'high', spring, UItem('pop1'), UItem('sort1')),
            Heading("Notes"),
            Label("Hover over a list to see which editor options are set, "
                  "if any."),
            Label("The editor of the first list, List(Int), uses "
                  "ignore_trailing_sep=False, so a trailing comma is "
                  "an error."),
            Label("The second list is a read-only view of the first list."),
            Label("The editor of the List(Float) example has enter_set=True "
                  "and auto_set=False; press Enter to validate."),
            Label("The List(Str) example will accept at most 3 elements."),
            Label("The editor of the List(Enum(...)) example uses sep=None, "
                  "i.e. whitespace acts as a separator."),
            Label("The last two List(Range(...)) examples take one or both "
                  "of their limits from the Low and High fields below."),
            width=720,
            title="CSVListEditor Demonstration",
        )

    def _list1_default(self):
        return [1, 4, 0, 10]

    def _get_list1str(self):
        return str(self.list1)

    def _pop1_fired(self):
        if len(self.list1) > 0:
            x = self.list1.pop()
            print x

    def _sort1_fired(self):
        self.list1.sort()


if __name__ == "__main__":
    demo = Demo()
    demo.configure_traits()
