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#!/usr/bin/python
"""**************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
*****************************************************************************
** February 2011
** - stardelegate example ported to PySide by Arun Srinivasan
** <rulfzid@gmail.com>
**************************************************************************"""
from PySide.QtGui import (QWidget, QPainter)
from PySide.QtCore import Signal
class StarEditor(QWidget):
""" The custome editor for editing StarRatings. """
# A signal to tell the delegate when we've finished editing.
editingFinished = Signal()
def __init__(self, parent=None):
""" Initialize the editor object, making sure we can watch mouse
events.
"""
super(StarEditor, self).__init__(parent)
self.setMouseTracking(True)
self.setAutoFillBackground(True)
def sizeHint(self):
""" Tell the caller how big we are. """
return self.starRating.sizeHint()
def paintEvent(self, event):
""" Paint the editor, offloading the work to the StarRating class. """
painter = QPainter(self)
self.starRating.paint(painter, self.rect(), self.palette(), isEditable=True)
def mouseMoveEvent(self, event):
""" As the mouse moves inside the editor, track the position and
update the editor to display as many stars as necessary.
"""
star = self.starAtPosition(event.x())
if (star != self.starRating.starCount) and (star != -1):
self.starRating.starCount = star
self.update()
def mouseReleaseEvent(self, event):
""" Once the user has clicked his/her chosen star rating, tell the
delegate we're done editing.
"""
self.editingFinished.emit()
def starAtPosition(self, x):
""" Calculate which star the user's mouse cursor is currently
hovering over.
"""
star = (x / (self.starRating.sizeHint().width() /
self.starRating.maxStarCount)) + 1
if (star <= 0) or (star > self.starRating.maxStarCount):
return -1
return star
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