# -*- 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