# This file is part of the Frescobaldi project, http://www.frescobaldi.org/
#
# Copyright (c) 2008 - 2012 by Wilbert Berendsen
#
# This program 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 2
# of the License, or (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
# See http://www.gnu.org/licenses/ for more information.

"""
QProgressBar subclasses.
"""

from __future__ import unicode_literals

from PyQt4.QtCore import QTimeLine, QTimer
from PyQt4.QtGui import QProgressBar

class TimedProgressBar(QProgressBar):
    """A QProgressBar showing a certain time elapse."""
    hideOnTimeout = True
    def __init__(self, parent=None):
        super(TimedProgressBar, self).__init__(parent, minimum=0, maximum=100)
        self._timeline = QTimeLine(updateInterval=100, frameChanged=self.setValue)
        self._timeline.setFrameRange(0, 100)
        self._hideTimer = QTimer(timeout=self._done, singleShot=True, interval=3000)
    
    def start(self, total, elapsed=0.0):
        """Starts showing progress.
        
        total is the number of seconds (maybe float) the timeline will last,
        elapsed (defaulting to 0) is the value to start with.
        
        """
        self._hideTimer.stop()
        self._timeline.stop()
        self._timeline.setDuration(total * 1000)
        self._timeline.setCurrentTime(elapsed * 1000)
        self.setValue(self._timeline.currentFrame())
        self._timeline.resume()
        if self.hideOnTimeout:
            self.show()
        
    def stop(self, showFinished=True):
        """Ends the progress display.
        
        If showFinished is True (the default), 100% is shown for a few
        seconds and then the progress is reset.
        The progressbar is hidden if the hideOnTimeout attribute is True.
        
        """
        self._hideTimer.stop()
        self._timeline.stop()
        if showFinished:
            self.setValue(100)
            self._hideTimer.start()
        else:
            self._done()

    def _done(self):
        self.reset()
        if self.hideOnTimeout:
            self.hide()

