# (C) Copyright 2008-2021 Enthought, Inc., Austin, TX
# 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!

# ------------------------------------------------------------------------------
# Copyright (c) 2007, Riverbank Computing Limited
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD license.
# However, when used with the GPL version of PyQt the additional terms
# described in the PyQt GPL exception also apply

#
# Author: Riverbank Computing Limited
# ------------------------------------------------------------------------------

""" Defines the various font editors and the font editor factory, for the
    PyQt user interface toolkit..
"""


from pyface.qt import QtCore, QtGui

from traitsui.editors.font_editor import (
    ToolkitEditorFactory as BaseToolkitEditorFactory,
)

from .editor_factory import (
    SimpleEditor as BaseSimpleEditor,
    TextEditor as BaseTextEditor,
    ReadonlyEditor as BaseReadonlyEditor,
)

from .editor import Editor



# Standard font point sizes
PointSizes = [
    "8",
    "9",
    "10",
    "11",
    "12",
    "14",
    "16",
    "18",
    "20",
    "22",
    "24",
    "26",
    "28",
    "36",
    "48",
    "72",
]

# ---------------------------------------------------------------------------
#  The PyQtToolkitEditorFactory class.
# ---------------------------------------------------------------------------
## We need to add qt4-specific methods to the editor factory, and so we create
## a subclass of the BaseToolkitEditorFactory.


class ToolkitEditorFactory(BaseToolkitEditorFactory):
    """ PyQt editor factory for font editors.
    """

    def to_qt4_font(self, editor):
        """ Returns a QFont object corresponding to a specified object's font
        trait.
        """
        return QtGui.QFont(editor.value)

    def from_qt4_font(self, font):
        """ Gets the application equivalent of a QFont value.
        """
        return font

    def str_font(self, font):
        """ Returns the text representation of the specified object trait value.
        """
        weight = {QtGui.QFont.Light: " Light", QtGui.QFont.Bold: " Bold"}.get(
            font.weight(), ""
        )
        style = {
            QtGui.QFont.StyleOblique: " Slant",
            QtGui.QFont.StyleItalic: " Italic",
        }.get(font.style(), "")
        return "%s point %s%s%s" % (
            font.pointSize(),
            font.family(),
            style,
            weight,
        )


class SimpleFontEditor(BaseSimpleEditor):
    """ Simple style of font editor, which displays a text field that contains
    a text representation of the font value (using that font if possible).
    Clicking the field displays a font selection dialog box.
    """

    def popup_editor(self):
        """ Invokes the pop-up editor for an object trait.
        """
        fnt, ok = QtGui.QFontDialog.getFont(
            self.factory.to_qt4_font(self), self.control
        )

        if ok:
            self.value = self.factory.from_qt4_font(fnt)
            self.update_editor()

    def update_editor(self):
        """ Updates the editor when the object trait changes externally to the
            editor.
        """
        super().update_editor()
        set_font(self)

    def string_value(self, font):
        """ Returns the text representation of a specified font value.
        """
        return self.factory.str_font(font)


class CustomFontEditor(Editor):
    """ Custom style of font editor, which displays the following:

        * A text field containing the text representation of the font value
          (using that font if possible).
        * A combo box containing all available type face names.
        * A combo box containing the available type sizes.
    """

    def init(self, parent):
        """ Finishes initializing the editor by creating the underlying toolkit
            widget.
        """
        self.control = QtGui.QWidget()
        layout = QtGui.QVBoxLayout(self.control)
        layout.setContentsMargins(0, 0, 0, 0)

        # Add the standard font control:
        self._font = font = QtGui.QLineEdit(self.str_value)
        font.editingFinished.connect(self.update_object)
        layout.addWidget(font)

        # Add all of the font choice controls:
        layout2 = QtGui.QHBoxLayout()

        self._facename = control = QtGui.QFontComboBox()
        control.setEditable(False)
        control.currentFontChanged.connect(self.update_object_parts)
        layout2.addWidget(control)

        self._point_size = control = QtGui.QComboBox()
        control.addItems(PointSizes)
        control.currentIndexChanged.connect(self.update_object_parts)
        layout2.addWidget(control)

        # These don't have explicit controls.
        self._bold = self._italic = False

        layout.addLayout(layout2)

    def update_object(self):
        """ Handles the user changing the contents of the font text control.
        """
        self.value = str(self._font.text())
        self._set_font(self.factory.to_qt4_font(self))
        self.update_editor()

    def update_object_parts(self):
        """ Handles the user modifying one of the font components.
        """
        fnt = self._facename.currentFont()

        fnt.setBold(self._bold)
        fnt.setItalic(self._italic)

        psz = int(self._point_size.currentText())
        fnt.setPointSize(psz)

        self.value = self.factory.from_qt4_font(fnt)

        self._font.setText(self.str_value)
        self._set_font(fnt)

    def update_editor(self):
        """ Updates the editor when the object trait changes externally to the
            editor.
        """
        font = self.factory.to_qt4_font(self)

        self._bold = font.bold()
        self._italic = font.italic()

        self._facename.setCurrentFont(font)

        try:
            idx = PointSizes.index(str(font.pointSize()))
        except ValueError:
            idx = PointSizes.index("9")

        self._point_size.setCurrentIndex(idx)

    def string_value(self, font):
        """ Returns the text representation of a specified font value.
        """
        return self.factory.str_font(font)

    def get_error_control(self):
        """ Returns the editor's control for indicating error status.
        """
        return [self._font, self._facename, self._point_size]

    # -- Private Methods ------------------------------------------------------

    def _set_font(self, font):
        """ Sets the font used by the text control to the specified font.
        """
        font.setPointSize(min(10, font.pointSize()))
        self._font.setFont(font)


class TextFontEditor(BaseTextEditor):
    """ Text style of font editor, which displays an editable text field
    containing a text representation of the font value (using that font if
    possible).
    """

    def update_object(self):
        """ Handles the user changing the contents of the edit control.
        """
        self.value = str(self.control.text())

    def update_editor(self):
        """ Updates the editor when the object trait changes external to the
            editor.
        """
        super().update_editor()
        set_font(self)

    def string_value(self, font):
        """ Returns the text representation of a specified font value.
        """
        return self.factory.str_font(font)


class ReadonlyFontEditor(BaseReadonlyEditor):
    """ Read-only style of font editor, which displays a read-only text field
    containing a text representation of the font value (using that font if
    possible).
    """

    def update_editor(self):
        """ Updates the editor when the object trait changes external to the
            editor.
        """
        super().update_editor()
        set_font(self)

    def string_value(self, font):
        """ Returns the text representation of a specified font value.
        """
        return self.factory.str_font(font)


# -------------------------------------------------------------------------
#  Set the editor control's font to match a specified font:
# -------------------------------------------------------------------------


def set_font(editor):
    """ Sets the editor control's font to match a specified font.
    """
    editor.control.setFont(editor.factory.to_qt4_font(editor))


# Define the names SimpleEditor, CustomEditor, TextEditor and ReadonlyEditor
# which are looked up by the editor factory for the font editor.
SimpleEditor = SimpleFontEditor
CustomEditor = CustomFontEditor
TextEditor = TextFontEditor
ReadonlyEditor = ReadonlyFontEditor
