# ------------------------------------------------------------------------------
#
#  Copyright (c) 2008, Enthought, Inc.
#  All rights reserved.
#
#  This software is provided without warranty under the terms of the BSD
#  license included in LICENSE.txt and may be redistributed only
#  under the conditions described in the aforementioned license.  The license
#  is also available online at http://www.enthought.com/licenses/BSD.txt
#
#  Thanks for using Enthought open source!
#
#  Author: David C. Morrill
#  Date:   10/07/2004
#
# ------------------------------------------------------------------------------

""" Defines the text editor factory for all traits toolkit backends.
"""



from traits.api import Dict, Str, Any, Bool

# CIRCULAR IMPORT FIXME: Importing from the source rather than traits.ui.api
# to avoid circular imports, as this EditorFactory will be part of
# traits.ui.api as well.
from ..view import View

from ..group import Group

from ..ui_traits import AView

from ..editor_factory import EditorFactory

# -------------------------------------------------------------------------
#  Define a simple identity mapping:
# -------------------------------------------------------------------------


class _Identity(object):
    """ A simple identity mapping.
    """

    def __call__(self, value):
        return value


# -------------------------------------------------------------------------
#  Trait definitions:
# -------------------------------------------------------------------------

# Mapping from user input text to other value
mapping_trait = Dict(Str, Any)

# Function used to evaluate textual user input
evaluate_trait = Any(_Identity())

# -------------------------------------------------------------------------
#  'ToolkitEditorFactory' class:
# -------------------------------------------------------------------------


class ToolkitEditorFactory(EditorFactory):
    """ Editor factory for text editors.
    """

    # -------------------------------------------------------------------------
    #  Trait definitions:
    # -------------------------------------------------------------------------

    #: Dictionary that maps user input to other values
    mapping = mapping_trait

    #: Is user input set on every keystroke?
    auto_set = Bool(True)

    #: Is user input set when the Enter key is pressed?
    enter_set = Bool(False)

    #: Is multi-line text allowed?
    multi_line = Bool(True)

    #: Is editor readonly (will use custom / default editor appearance with readonly flag set to true)
    #: in contrasrt with readonly style for item when completely another edito
    #: is used
    read_only = Bool(False)

    #: Is user input unreadable? (e.g., for a password)
    password = Bool(False)

    #: Function to evaluate textual user input
    evaluate = evaluate_trait

    #: The object trait containing the function used to evaluate user input
    evaluate_name = Str()

    #: The optional view to display when a read-only text editor is clicked:
    view = AView

    #: In a read-only text editor, allow selection and copying of the text.
    readonly_allow_selection = Bool(False)

    #: Grayed-out placeholder text to be displayed when the editor is empty.
    placeholder = Str()

    # -------------------------------------------------------------------------
    #  Traits view definition:
    # -------------------------------------------------------------------------

    traits_view = View(
        [
            "auto_set{Set value when text is typed}",
            "enter_set{Set value when enter is pressed}",
            "multi_line{Allow multiple lines of text}",
            "<extras>",
            "|options:[Options]>",
        ]
    )

    extras = Group("password{Is this a password field?}")


# Define the TextEditor class.
TextEditor = ToolkitEditorFactory
