"""Defines the DirectSlider class.
See the :ref:`directslider` page in the programming manual for a more
in-depth explanation and an example of how to use this class.
"""
__all__ = ['DirectSlider']
from panda3d.core import *
from . import DirectGuiGlobals as DGG
from .DirectFrame import *
from .DirectButton import *
from math import isnan
[docs]class DirectSlider(DirectFrame):
"""
DirectSlider -- a widget which represents a slider that the
user can pull left and right to represent a continuous value.
"""
[docs] def __init__(self, parent = None, **kw):
optiondefs = (
# Define type of DirectGuiWidget
('pgFunc', PGSliderBar, None),
('state', DGG.NORMAL, None),
('frameColor', (0.6, 0.6, 0.6, 1), None),
('range', (0, 1), self.setRange),
('value', 0, self.__setValue),
('scrollSize', 0.01, self.setScrollSize),
('pageSize', 0.1, self.setPageSize),
('orientation', DGG.HORIZONTAL, self.setOrientation),
# Function to be called repeatedly as slider is moved
('command', None, None),
('extraArgs', [], None),
)
if kw.get('orientation') in (DGG.VERTICAL, DGG.VERTICAL_INVERTED):
# These are the default options for a vertical layout.
optiondefs += (
('frameSize', (-0.08, 0.08, -1, 1), None),
('frameVisibleScale', (0.25, 1), None),
)
else:
# These are the default options for a horizontal layout.
optiondefs += (
('frameSize', (-1, 1, -0.08, 0.08), None),
('frameVisibleScale', (1, 0.25), None),
)
# Merge keyword options with default options
self.defineoptions(kw, optiondefs)
# Initialize superclasses
DirectFrame.__init__(self, parent)
self.thumb = self.createcomponent("thumb", (), None,
DirectButton, (self,),
borderWidth = self['borderWidth'])
if self.thumb['frameSize'] is None:
# Compute a default frameSize for the thumb.
f = self['frameSize']
if self['orientation'] == DGG.HORIZONTAL:
self.thumb['frameSize'] = (f[0]*0.05, f[1]*0.05, f[2], f[3])
else:
self.thumb['frameSize'] = (f[0], f[1], f[2]*0.05, f[3]*0.05)
self._lastOrientation = self['orientation']
self.guiItem.setThumbButton(self.thumb.guiItem)
# Bind command function
self.bind(DGG.ADJUST, self.commandFunc)
# Call option initialization functions
self.initialiseoptions(DirectSlider)
[docs] def setRange(self):
# Try to preserve the value across a setRange call.
v = self['value']
r = self['range']
self.guiItem.setRange(r[0], r[1])
self['value'] = v
def __setValue(self):
# This is the internal function that is called when
# self['value'] is directly assigned.
value = self['value']
assert not isnan(value)
self.guiItem.setValue(value)
[docs] def setValue(self, value):
# This is the public function that is meant to be called by a
# user that doesn't like to use (or doesn't understand) the
# preferred interface of self['value'].
assert not isnan(value)
self['value'] = value
[docs] def getValue(self):
return self.guiItem.getValue()
[docs] def getRatio(self):
return self.guiItem.getRatio()
[docs] def setPageSize(self):
self.guiItem.setPageSize(self['pageSize'])
[docs] def setOrientation(self):
if self['orientation'] == DGG.HORIZONTAL:
if self._lastOrientation in (DGG.VERTICAL, DGG.VERTICAL_INVERTED):
fpre = self['frameSize']
# swap frameSize width and height to keep custom frameSizes
self['frameSize'] = (fpre[2], fpre[3], fpre[0], fpre[1])
tf = self.thumb['frameSize']
self.thumb['frameSize'] = (tf[2], tf[3], tf[0], tf[1])
self.guiItem.setAxis(Vec3(1, 0, 0))
self['frameVisibleScale'] = (1, 0.25)
elif self['orientation'] == DGG.VERTICAL:
if self._lastOrientation == DGG.HORIZONTAL:
fpre = self['frameSize']
# swap frameSize width and height to keep custom frameSizes
self['frameSize'] = (fpre[2], fpre[3], fpre[0], fpre[1])
tf = self.thumb['frameSize']
self.thumb['frameSize'] = (tf[2], tf[3], tf[0], tf[1])
self.guiItem.setAxis(Vec3(0, 0, 1))
self['frameVisibleScale'] = (0.25, 1)
elif self['orientation'] == DGG.VERTICAL_INVERTED:
if self._lastOrientation == DGG.HORIZONTAL:
fpre = self['frameSize']
# swap frameSize width and height to keep custom frameSizes
self['frameSize'] = (fpre[2], fpre[3], fpre[0], fpre[1])
tf = self.thumb['frameSize']
self.thumb['frameSize'] = (tf[2], tf[3], tf[0], tf[1])
self.guiItem.setAxis(Vec3(0, 0, -1))
self['frameVisibleScale'] = (0.25, 1)
else:
raise ValueError('Invalid value for orientation: %s' % (self['orientation']))
self._lastOrientation = self['orientation']
[docs] def destroy(self):
if hasattr(self, 'thumb'):
self.thumb.destroy() # ow!
del self.thumb
DirectFrame.destroy(self)
[docs] def commandFunc(self):
# Store the updated value in self['value']
self._optionInfo['value'][DGG._OPT_VALUE] = self.guiItem.getValue()
if self['command']:
self['command'](*self['extraArgs'])
