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# PiTiVi , Non-linear video editor
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# pitivi/ui/complexlayer.py
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# Copyright (c) 2006, Edward Hervey <bilboed@bilboed.com>
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with this program; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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Interface for managing tranformation between timeline timestamps and UI
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# Complex Timeline interfaces v2 (01 Jul 2008)
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# -----------------------
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# Interface for the Complex Timeline widgets for setting, getting,
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# distributing and modifying the zoom ratio and the size of the widget.
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# A zoomratio is the number of pixels per second
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# ex : 10.0 = 10 pixels for a second
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# ex : 0.1 = 1 pixel for 10 seconds
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# ex : 1.0 = 1 pixel for a second
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class Zoomable(object):
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zoom_levels = [1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5] + range(5, 10, 1) + \
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zoomratio = zoom_levels[_cur_zoom]
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# FIXME: ideally we should deprecate this
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Zoomable.addInstance(self)
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if self in Zoomable._instances:
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# FIXME: ideally we should deprecate this and spit a warning here
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self._instances.remove(self)
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def addInstance(cls, instance):
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cls._instances.append(instance)
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def removeInstance(cls, instance):
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cls._instances.remove(instance)
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def setZoomRatio(cls, ratio):
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cls._cur_zoom = min(len(cls.zoom_levels) - 1, cls._cur_zoom + 1)
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cls.setZoomRatio(cls._computeZoomRatio(cls._cur_zoom))
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cls._cur_zoom = max(0, cls._cur_zoom - 1)
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cls.setZoomRatio(cls._computeZoomRatio(cls._cur_zoom))
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def _computeZoomRatio(cls, index):
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return cls.zoom_levels[index]
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def pixelToNs(cls, pixel):
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Returns the pixel equivalent in nanoseconds according to the zoomratio
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return long(pixel * gst.SECOND / cls.zoomratio)
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def nsToPixel(cls, duration):
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Returns the pixel equivalent of the given duration, according to the
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if long(duration) == long(gst.CLOCK_TIME_NONE):
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return int((float(duration) / gst.SECOND) * cls.zoomratio)
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def _zoomChanged(cls):
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for inst in cls._instances:
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def zoomChanged(self):
added
removed
pitivi/ui/zoominterface.py
