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# Copyright 2008 Nanorex, Inc. See LICENSE file for details.
"""
PM_Dial.py
@author: Mark
@version: $Id$
@copyright: 2008 Nanorex, Inc. All rights reserved.
History:
piotr 2008-07-29: Created this file.
"""
from PyQt4.Qt import QDial
from PyQt4.Qt import QLabel
from PyQt4.Qt import QWidget
from widgets.prefs_widgets import widget_connectWithState
from widgets.prefs_widgets import set_metainfo_from_stateref
class PM_Dial( QDial ):
"""
The PM_Dial widget provides a QDial (with an
optional label) for a Property Manager group box.
"""
defaultValue = 0.0
setAsDefault = True
labelWidget = None
def __init__(self,
parentWidget,
label = '',
suffix = '',
labelColumn = 1,
value = 0.0,
setAsDefault = True,
minimum = 0.0,
maximum = 360.0,
notchSize = 1,
notchTarget = 10.0,
notchesVisible = True,
wrapping = True,
spanWidth = True
):
"""
Appends a QDial (Qt) widget to the bottom of I{parentWidget},
a Property Manager group box.
@param parentWidget: The parent group box containing this widget.
@type parentWidget: PM_GroupBox
@see: U{B{QDial}<http://doc.trolltech.com/4/qdial.html>}
"""
if not parentWidget:
return
QDial.__init__(self)
self.parentWidget = parentWidget
self.label = label
self.labelColumn = labelColumn
self.setAsDefault = setAsDefault
self.spanWidth = spanWidth
self.suffix = suffix
if label: # Create this widget's QLabel.
self.labelWidget = QLabel()
self.updateValueLabel()
self.labelWidget.setText(self.value_label)
# Set QDial minimum, maximum, then value
self.setRange(minimum, maximum)
self.setValue(value) # This must come after setDecimals().
if setAsDefault:
self.setDefaultValue(value)
self.notchSize = notchSize
self.setNotchTarget(notchTarget)
self.setNotchesVisible(notchesVisible)
self.setWrapping(wrapping)
parentWidget.addPmWidget(self)
def restoreDefault( self ):
"""
Restores the default value.
"""
if self.setAsDefault:
self.setValue(self.defaultValue)
def setDefaultValue(self, value):
"""
Sets the default value of the dial to I{value}. The current dial
value is unchanged.
@param value: The new default value of the dial.
@type value: float
@see: L{setValue}
"""
self.setAsDefault = True
self.defaultValue = value
def setValue(self, value, setAsDefault = True):
"""
Sets the value of the dial to I{value}.
setValue() will emit valueChanged() if the new value is different from
the old one.
@param value: The new dial value.
@type value: float
## @param setAsDefault: Determines if the dial value is reset when
## the "Restore Defaults" button is clicked. If True,
## (the default) I{value} will be used as the reset
## value.
## @type setAsDefault: bool
@note: The value will be rounded so it can be displayed with the current
setting of decimals.
@see: L{setDefaultValue}
"""
QDial.setValue(self, value)
self.updateValueLabel()
def updateValueLabel(self):
"""
Updates a widget's label with a value.
"""
if self.label:
self.value_label = " " + self.label + " " + \
"%-4d" % int(self.value()) + " " + self.suffix
self.labelWidget.setText(self.value_label)
def connectWithState(self, stateref,
set_metainfo = True,
debug_metainfo = False):
"""
Connect self to the state referred to by stateref,
so changes to self's value change that state's value
and vice versa. By default, also set self's metainfo
to correspond to what the stateref provides.
@param stateref: a reference to state of type double,
which meets the state-reference interface StateRef_API.
@type stateref: StateRef_API
@param set_metainfo: whether to also set defaultValue, minimum,
and/or maximum, if these are provided by the stateref. (This
list of metainfo attributes will probably be extended.)
@type set_metainfo: bool
@param debug_metainfo: whether to print debug messages
about the actions taken by set_metainfo, when it's true.
@type debug_metainfo: bool
"""
if set_metainfo:
# Do this first, so old min/max don't prevent setting the
# correct current value when we connect new state.
#
# REVIEW: the conventions for expressing a lack of
# minimum, maximum, or defaultValue, either on self
# or on the stateref, may need revision, so it's not
# ambiguous whether the stateref knows the minimum (etc)
# should be unset on self or doesn't care what it's set to.
# Ideally, some explicit value of stateref.minimum
# would correspond to "no minimum" (i.e. a minimum of
# negative infinity), etc.
# [bruce 070926]
set_metainfo_from_stateref( self.setMinimum, stateref, 'minimum',
debug_metainfo)
set_metainfo_from_stateref( self.setMaximum, stateref, 'maximum',
debug_metainfo)
set_metainfo_from_stateref( self.setDefaultValue,
stateref,
'defaultValue',
debug_metainfo)
###widget_connectWithState( self, stateref,
### QDoubleSpinBox_ConnectionWithState)
print "PM_Dial.connectWithState: not yet implemented" #bruce 080811 added this line
return
def hide( self ):
"""
Hides the dial and its label (if it has one).
Call L{show()} to unhide the dial.
@see: L{show}
"""
QWidget.hide(self)
if self.labelWidget:
self.labelWidget.hide()
def show( self ):
"""
Unhides the dial and its label (if it has one).
@see: L{hide}
"""
QWidget.show(self)
if self.labelWidget:
self.labelWidget.show()
# End of PM_Dial ########################################
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