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# -*- coding: utf-8 -*-
# libavg - Media Playback Engine.
# Copyright (C) 2003-2014 Ulrich von Zadow
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Current versions can be found at www.libavg.de
#
from libavg import avg, gesture
from . import slider
from base import HVStretchNode, Orientation
from . import skin
class ScrollPane(avg.DivNode):
def __init__(self, contentNode, parent=None, **kwargs):
super(ScrollPane, self).__init__(crop=True, **kwargs)
self.registerInstance(self, parent)
self.appendChild(contentNode)
self._contentNode = contentNode
def setContentPos(self, pos):
def constrain(pos, limit):
if limit > 0:
# Content larger than container
if pos > limit:
pos = limit
elif pos < 0:
pos = 0
else:
# Content smaller than container
if pos > 0:
pos = 0
elif pos < limit:
pos = limit
return pos
maxPos = self.getMaxContentPos()
pos = avg.Point2D(pos)
pos.x = constrain(pos.x, maxPos.x)
pos.y = constrain(pos.y, maxPos.y)
self._contentNode.pos = -pos
def getContentPos(self):
return -self._contentNode.pos
contentpos = property(getContentPos, setContentPos)
def getContentSize(self):
return self._contentNode.size
def setContentSize(self, size):
self._contentNode.size = size
self.setContentPos(-self._contentNode.pos) # Recheck constraints.
contentsize = property(getContentSize, setContentSize)
def getMaxContentPos(self):
maxPos = avg.Point2D(self._contentNode.size - self.size)
if maxPos.x < 0:
maxPos.x = 0
if maxPos.y < 0:
maxPos.y = 0
return maxPos
class ScrollArea(avg.DivNode):
PRESSED = avg.Publisher.genMessageID()
RELEASED = avg.Publisher.genMessageID()
CONTENT_POS_CHANGED = avg.Publisher.genMessageID()
def __init__(self, contentNode, size, skinObj=skin.Skin.default, enabled=True,
scrollBars=(Orientation.HORIZONTAL, Orientation.VERTICAL),
parent=None, **kwargs):
super(ScrollArea, self).__init__(**kwargs)
self.registerInstance(self, parent)
self.cfg = skinObj.defaultScrollAreaCfg
self.publish(self.PRESSED)
self.publish(self.RELEASED)
self.publish(self.CONTENT_POS_CHANGED)
self.__scrollPane = ScrollPane(contentNode=contentNode, parent=self)
if "borderBmp" in self.cfg:
endsExtent = self.cfg["borderEndsExtent"]
self._borderNode = HVStretchNode(src=self.cfg["borderBmp"],
endsExtent=endsExtent, sensitive=False, parent=self)
else:
self._borderNode = None
sensitiveScrollBars = self.cfg["sensitiveScrollBars"]
if Orientation.HORIZONTAL in scrollBars:
self._hScrollBar = slider.ScrollBar(sensitive=sensitiveScrollBars,
parent=self, skinObj=skinObj)
self._hScrollBar.subscribe(slider.Slider.THUMB_POS_CHANGED,
self.__onHThumbMove)
else:
self._hScrollBar = None
if Orientation.VERTICAL in scrollBars:
self._vScrollBar = slider.ScrollBar(orientation=Orientation.VERTICAL,
sensitive=sensitiveScrollBars, parent=self, skinObj=skinObj)
self._vScrollBar.subscribe(slider.Slider.THUMB_POS_CHANGED,
self.__onVThumbMove)
else:
self._vScrollBar = None
self.subscribe(self.SIZE_CHANGED, self.__positionNodes)
self.size = size
self.__enabled = True
if not(enabled):
self.setEnabled(False)
self.recognizer = gesture.DragRecognizer(
eventNode=self.__scrollPane,
detectedHandler=self.__onDragStart,
moveHandler=self.__onDragMove,
upHandler=self.__onDragUp,
friction=self.cfg["friction"]
)
def getContentSize(self):
return self.__scrollPane._contentNode.size
def setContentSize(self, size):
self.__scrollPane.contentsize = size
self.__positionNodes(self.size)
contentsize = property(getContentSize, setContentSize)
def getContentPos(self):
return self.__scrollPane.contentpos
def setContentPos(self, pos):
self.__scrollPane.contentpos = pos
self.__positionNodes(self.size)
self.__positionThumbs(avg.Point2D(pos))
self.notifySubscribers(self.CONTENT_POS_CHANGED, [self.__scrollPane.contentpos])
contentpos = property(getContentPos, setContentPos)
def getEnabled(self):
return self.__enabled
def setEnabled(self, enabled):
if enabled and not(self.__enabled):
self.recognizer.enable(True)
elif not(enabled) and self.__enabled:
self.recognizer.enable(False)
if self._vScrollBar:
self._vScrollBar.enabled = enabled
if self._hScrollBar:
self._hScrollBar.enabled = enabled
self.__enabled = enabled
enabled = property(getEnabled, setEnabled)
def __onHThumbMove(self, thumbPos):
self.__scrollPane.contentpos = (thumbPos, self.__scrollPane.contentpos.y)
self.notifySubscribers(self.CONTENT_POS_CHANGED, [self.__scrollPane.contentpos])
def __onVThumbMove(self, thumbPos):
self.__scrollPane.contentpos = (self.__scrollPane.contentpos.x, thumbPos)
self.notifySubscribers(self.CONTENT_POS_CHANGED, [self.__scrollPane.contentpos])
def __onDragStart(self):
self.__dragStartPos = self.__scrollPane.contentpos
self.notifySubscribers(self.PRESSED, [])
def __onDragMove(self, offset):
contentpos = self.__dragStartPos - offset
self.__scrollPane.contentpos = contentpos
self.__positionThumbs(contentpos)
self.notifySubscribers(self.CONTENT_POS_CHANGED, [self.__scrollPane.contentpos])
def __onDragUp(self, offset):
self.__onDragMove(offset)
self.notifySubscribers(self.RELEASED, [])
def __positionNodes(self, size):
paneSize = size
if self._borderNode:
self._borderNode.size = size
margins = self.cfg["margins"]
if self._hScrollBar:
paneSize -= (0, margins[0]+margins[2])
if self._vScrollBar:
paneSize -= (margins[1]+margins[3], 0)
self.__scrollPane.pos = (margins[0], margins[1])
self.__scrollPane.size = paneSize
if self._hScrollBar:
self._hScrollBar.pos = (0, size.y-self._hScrollBar.height)
self._hScrollBar.width = self.__scrollPane.width
if self.__scrollPane.contentsize.x <= self.__scrollPane.width:
self._hScrollBar.range = (0, self.__scrollPane.width)
self._hScrollBar.enabled = False
else:
self._hScrollBar.range = (0, self.__scrollPane.contentsize.x)
self._hScrollBar.enabled = True
self._hScrollBar.thumbExtent = self.__scrollPane.width
if self._vScrollBar:
self._vScrollBar.pos = (size.x-self._vScrollBar.width, 0)
self._vScrollBar.height = self.__scrollPane.height
if self.__scrollPane.contentsize.y <= self.__scrollPane.height:
self._vScrollBar.range = (0, self.__scrollPane.height)
self._vScrollBar.enabled = False
else:
self._vScrollBar.range = (0, self.__scrollPane.contentsize.y)
self._vScrollBar.enabled = True
self._vScrollBar.thumbExtent = self.__scrollPane.height
def __positionThumbs(self, contentPos):
if self._hScrollBar:
self._hScrollBar.thumbPos = contentPos.x
if self._vScrollBar:
self._vScrollBar.thumbPos = contentPos.y
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