colorDialog.py

#
# Copyright (C) 2011 Michael Pitidis, Hussein Abdulwahid.
#
# This file is part of Labelme.
#
# Labelme is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Labelme is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Labelme.  If not, see <http://www.gnu.org/licenses/>.
#

from PyQt4.QtGui import *
from PyQt4.QtCore import *

BB = QDialogButtonBox

class ColorDialog(QColorDialog):
    def __init__(self, parent=None):
        super(ColorDialog, self).__init__(parent)
        self.setOption(QColorDialog.ShowAlphaChannel)
        # The Mac native dialog does not support our restore button.
        self.setOption(QColorDialog.DontUseNativeDialog)
        ## Add a restore defaults button.
        # The default is set at invocation time, so that it
        # works across dialogs for different elements.
        self.default = None
        self.bb = self.layout().itemAt(1).widget()
        self.bb.addButton(BB.RestoreDefaults)
        self.bb.clicked.connect(self.checkRestore)

    def getColor(self, value=None, title=None, default=None):
        self.default = default
        if title:
            self.setWindowTitle(title)
        if value:
            self.setCurrentColor(value)
        return self.currentColor() if self.exec_() else None

    def checkRestore(self, button):
        if self.bb.buttonRole(button) & BB.ResetRole and self.default:
            self.setCurrentColor(self.default)