#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# PCEF - PySide Code Editing framework
# Copyright 2013, Colin Duquesnoy <colin.duquesnoy@gmail.com>
#
# This software is released under the LGPLv3 license.
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
""" This module contains the editor zoom mode """
import copy
from PySide.QtCore import Qt
from PySide.QtGui import QKeyEvent
from PySide.QtGui import QWheelEvent
from pcef.core import Mode
from pcef import style


[docs]class EditorZoomMode(Mode):
    """
    Zoom in/out mode. (the editor font is increased/decreased)
    """
    #: Mode identifier
    IDENTIFIER = "Editor zoom"
    #: Mode description
    DESCRIPTION = "Zoom the editor with ctrl+mouse wheel"

    def __init__(self):
        super(EditorZoomMode, self).__init__(
            self.IDENTIFIER, self.DESCRIPTION)
        self.prev_delta = 0
        self.default_font_size = style.DEFAULT_FONT_SIZE

    def _onStateChanged(self, state):
        if state is True:
            self.editor.codeEdit.mouseWheelActivated.connect(
                self.__onWheelEvent)
            self.editor.codeEdit.keyPressed.connect(self.__onKeyPressed)
        else:
            self.editor.codeEdit.mouseWheelActivated.disconnect(self.__onWheelEvent)
            self.editor.codeEdit.keyPressed.disconnect(self.__onKeyPressed)

    def _onStyleChanged(self):
        pass

    def __onKeyPressed(self, event):
        """
        Resets editor font size to the default font size
        :param event: wheelEvent
        :type event: QKeyEvent
        :return:
        """
        if (event.key() == Qt.Key_0 and
                event.modifiers() & Qt.ControlModifier > 0):
            style = copy.copy(self.currentStyle)
            style.fontSize = self.default_font_size
            event.setAccepted(True)
            self.editor.currentStyle = style

    def __onWheelEvent(self, event):
        """
        Increments or decrements editor fonts settings on mouse wheel event
        if ctrl modifier is on.
        :param event: wheel event
        :type event: QWheelEvent
        """
        delta = event.delta()
        if event.modifiers() & Qt.ControlModifier > 0:
            style = copy.copy(self.currentStyle)
            self.editor.currentStyle = style
            if delta < self.prev_delta:
                style.fontSize -= 1
            else:
                style.fontSize += 1
            if style.fontSize <= 0:
                style.fontSize = 1
            event.setAccepted(True)
            self.editor.currentStyle = style