/usr/share/pyshared/libavg/ui/button.py is in python-libavg 1.7.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
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# libavg - Media Playback Engine.
# Copyright (C) 2003-2011 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
#
# Original author of this file is Henrik Thoms
from libavg import avg, statemachine, utils
import gesture
from helper import *
g_Player = avg.Player.get()
class Button(avg.DivNode):
STATE_DISABLED = 1
STATE_UP = 2
STATE_DOWN = 3
def __init__(self, upNode = None, downNode = None, disabledNode = None,
activeAreaNode = None, pressHandler = None, clickHandler = None,
stateChangeHandler = None, **kwargs):
avg.DivNode.__init__(self, **kwargs)
self.__upNode = upNode
self.__downNode = downNode
self.__disabledNode = disabledNode
self.__activeAreaNode = activeAreaNode
self.__pressCallback = utils.methodref(pressHandler)
self.__clickCallback = utils.methodref(clickHandler)
self.__stateChangeCallback = utils.methodref(stateChangeHandler)
self.__capturedCursorIds = set()
self.__overCursorIds = set()
self.__isCheckable = False
self.__isToggled = False
self.__isOver = False
self.__state = Button.STATE_UP
if self.__upNode and self.__downNode:
self.__setupNodes()
def delete(self):
self.__pressCallback = None
self.__clickCallback = None
self.__stateChangeCallback = None
self.__deactivateEventHandlers()
def setEventHandler(self, type, source, func):
raise RuntimeError("Setting event handlers for buttons is not supported")
def getUpNode(self):
return self.__upNode
def getDownNode(self):
return self.__downNode
def getDisabledNode(self):
return self.__disabledNode
def setNodes(self, upNode, downNode, disabledNode = None, activeAreaNode = None):
if self.__activeAreaNode and self.isEnabled():
self.__deactivateEventHandlers()
self.__upNode = upNode
self.__downNode = downNode
self.__disabledNode = disabledNode
self.__activeAreaNode = activeAreaNode
self.__setupNodes()
def setPressHandler(self, handler):
self.__pressCallback = utils.methodref(handler)
def setClickHandler(self, handler):
self.__clickCallback = utils.methodref(handler)
def setCheckable(self, val):
self.__isCheckable = val
def isCheckable(self):
return self.__isCheckable
def setChecked(self, val):
assert(self.__isCheckable)
assert(self.isEnabled())
self.__isToggled = val
state = Button.STATE_DOWN if self.__isToggled else Button.STATE_UP
self.__changeState(state)
def isChecked(self):
assert(self.__isCheckable)
# XXX: Shouldn't this check self.__isToggled?
return self.__state == Button.STATE_DOWN
def setEnabled(self, isEnabled):
if (isEnabled == self.isEnabled()):
# No state change
return
state = Button.STATE_DISABLED if not(isEnabled) else Button.STATE_UP
self.__changeState(state)
if self.__state == Button.STATE_DISABLED:
self.__deactivateEventHandlers()
self.__overCursorIds = set()
else:
self.__activateEventHandlers()
def isEnabled(self):
return self.__state != Button.STATE_DISABLED
def __setupNodes(self):
while self.getNumChildren() > 0:
self.removeChild(self.getChild(0))
self.appendChild(self.__upNode)
self.appendChild(self.__downNode)
if self.__disabledNode:
self.appendChild(self.__disabledNode)
if self.__activeAreaNode == None:
self.__activeAreaNode = avg.RectNode(opacity=0, size=self.__upNode.size)
self.appendChild(self.__activeAreaNode)
self.size = self.__activeAreaNode.size
self.__updateNodesVisibility()
if self.isEnabled():
self.__activateEventHandlers()
def __updateNodesVisibility(self):
for element in (self.__upNode, self.__downNode, self.__disabledNode):
if element:
element.active = False
if self.__state == Button.STATE_UP:
activeNode = self.__upNode
elif self.__state == Button.STATE_DOWN:
activeNode = self.__downNode
elif self.__state == Button.STATE_DISABLED:
activeNode = self.__disabledNode
else:
# This state doesn't exist.
assert(False)
activeNode.active = True
def __changeState(self, state):
self.__state = state
self.__updateNodesVisibility()
utils.callWeakRef(self.__stateChangeCallback, state)
def __captureCursor(self, id):
self.__capturedCursorIds.add(id)
self.__activeAreaNode.setEventCapture(id)
def __releaseCapturedCursor(self, id):
self.__capturedCursorIds.remove(id)
self.releaseEventCapture(id)
def __isCursorCaptured(self, id):
return id in self.__capturedCursorIds
def __getNumberOfCapturedCursors(self):
return len(self.__capturedCursorIds)
def __hasCapturedCursor(self):
return len(self.__capturedCursorIds) != 0
def __pressHandler(self, event):
if not self.__isCursorCaptured(event.cursorid):
self.__captureCursor(event.cursorid)
if event.cursorid not in self.__overCursorIds:
self.__overCursorIds.add(event.cursorid)
if self.__getNumberOfCapturedCursors() <= 1:
self.__changeState(Button.STATE_DOWN)
utils.callWeakRef(self.__pressCallback, event)
def __releaseHandler(self, event):
numberOfCapturedCursors = self.__getNumberOfCapturedCursors()
numberOfOverCursors = len(self.__overCursorIds)
if self.__isCursorCaptured(event.cursorid):
self.__releaseCapturedCursor(event.cursorid)
if event.cursorid in self.__overCursorIds:
self.__overCursorIds.remove(event.cursorid)
if numberOfCapturedCursors == 1 and numberOfOverCursors == 1:
newState = Button.STATE_UP
if self.isCheckable():
self.__isToggled = not self.__isToggled
if self.__isToggled:
newState = Button.STATE_DOWN
self.__changeState(newState)
utils.callWeakRef(self.__clickCallback, event)
def __overHandler(self, event):
if event.cursorid not in self.__overCursorIds:
self.__overCursorIds.add(event.cursorid)
if self.__hasCapturedCursor() and len(self.__overCursorIds):
self.__changeState(Button.STATE_DOWN)
self.__isOver = not(self.__isOver)
return True
def __outHandler(self, event):
if event.cursorid in self.__overCursorIds:
self.__overCursorIds.remove(event.cursorid)
if self.__hasCapturedCursor() and not len(self.__overCursorIds):
newState = Button.STATE_UP
if self.isCheckable():
if self.__isToggled:
newState = Button.STATE_DOWN
self.__changeState(newState)
self.__isOver = not(self.__isOver)
return True
def __activateEventHandlers(self):
def setOneHandler(type, handler):
self.__activeAreaNode.connectEventHandler(type, avg.MOUSE | avg.TOUCH,
self, handler)
setOneHandler(avg.CURSORDOWN, self.__pressHandler)
setOneHandler(avg.CURSORUP, self.__releaseHandler)
setOneHandler(avg.CURSOROVER, self.__overHandler)
setOneHandler(avg.CURSOROUT, self.__outHandler)
def __deactivateEventHandlers(self):
for id in self.__capturedCursorIds:
self.releaseEventCapture(id)
self.__capturedCursorIds = set()
self.__activeAreaNode.disconnectEventHandler(self)
class TouchButton(avg.DivNode):
def __init__(self, upNode, downNode, disabledNode = None, activeAreaNode = None,
fatFingerEnlarge=False, clickHandler = None, **kwargs):
avg.DivNode.__init__(self, **kwargs)
self.__upNode = upNode
self.__downNode = downNode
self.__disabledNode = disabledNode
self.__activeAreaNode = activeAreaNode
self.__clickHandler = utils.methodref(clickHandler)
self.__isOver = False
self.__stateMachine = statemachine.StateMachine("TouchButton", "UP")
self.__stateMachine.addState("UP", ("DOWN", "DISABLED"),
enterFunc=self.enterUp, leaveFunc=self.leaveUp)
self.__stateMachine.addState("DOWN", ("UP", "DISABLED"),
enterFunc=self.enterDown, leaveFunc=self.leaveDown)
self.__stateMachine.addState("DISABLED", ("UP", "DOWN"),
enterFunc=self.enterDisabled, leaveFunc=self.leaveDisabled)
self.appendChild(self.__upNode)
self.__upNode.active = True
self.appendChild(self.__downNode)
self.__downNode.active = False
if self.__disabledNode:
self.appendChild(self.__disabledNode)
self.__disabledNode.active = False
if fatFingerEnlarge:
if self.__activeAreaNode != None:
raise(RuntimeError(
"TouchButton: Can't specify both fatFingerEnlarge and activeAreaNode"))
size = upNode.size
minSize = 20*g_Player.getPixelsPerMM()
size = avg.Point2D(max(minSize, size.x), max(minSize, size.y))
self.__activeAreaNode = avg.RectNode(size=size, opacity=0, parent=self)
else:
if self.__activeAreaNode == None:
self.__activeAreaNode = self.__upNode
else:
self.appendChild(self.__activeAreaNode)
self.__tapRecognizer = gesture.TapRecognizer(self.__activeAreaNode,
possibleHandler=self.__onDown,
detectedHandler=self.__onTap,
failHandler=self.__onTapFail)
@classmethod
def fromSrc(cls, upSrc, downSrc, disabledSrc=None, **kwargs):
upNode = avg.ImageNode(href=upSrc)
downNode = avg.ImageNode(href=downSrc)
if disabledSrc != None:
disabledNode = avg.ImageNode(href=disabledSrc)
else:
disabledNode = None
return TouchButton(upNode=upNode, downNode=downNode, disabledNode=disabledNode,
**kwargs)
def getEnabled(self):
return self.__stateMachine.state != "DISABLED"
def setEnabled(self, enabled):
if enabled:
if self.__stateMachine.state == "DISABLED":
self.__stateMachine.changeState("UP")
else:
if self.__stateMachine.state != "DISABLED":
self.__stateMachine.changeState("DISABLED")
enabled = property(getEnabled, setEnabled)
def __onDown(self, event):
self.__stateMachine.changeState("DOWN")
def __onTap(self, event):
self.__stateMachine.changeState("UP")
utils.callWeakRef(self.__clickHandler)
def __onTapFail(self, event):
self.__stateMachine.changeState("UP")
def enterUp(self):
self.__upNode.active = True
def leaveUp(self):
self.__upNode.active = False
def enterDown(self):
self.__downNode.active = True
def leaveDown(self):
self.__downNode.active = False
def enterDisabled(self):
if self.__disabledNode:
self.__disabledNode.active = True
self.__tapRecognizer.enable(False)
def leaveDisabled(self):
if self.__disabledNode:
self.__disabledNode.active = False
self.__tapRecognizer.enable(True)
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