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pyqtgraph/parametertree/Parameter.py

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from pyqtgraph.Qt import QtGui, QtCore
import os, weakref, re
from pyqtgraph.pgcollections import OrderedDict
from .ParameterItem import ParameterItem
PARAM_TYPES = {}
PARAM_NAMES = {}
def registerParameterType(name, cls, override=False):
global PARAM_TYPES
if name in PARAM_TYPES and not override:
raise Exception("Parameter type '%s' already exists (use override=True to replace)" % name)
PARAM_TYPES[name] = cls
PARAM_NAMES[cls] = name
class Parameter(QtCore.QObject):
"""
A Parameter is the basic unit of data in a parameter tree. Each parameter has
a name, a type, a value, and several other properties that modify the behavior of the
Parameter. Parameters may have parent / child / sibling relationships to construct
organized hierarchies. Parameters generally do not have any inherent GUI or visual
interpretation; instead they manage ParameterItem instances which take care of
display and user interaction.
Note: It is fairly uncommon to use the Parameter class directly; mostly you
will use subclasses which provide specialized type and data handling. The static
pethod Parameter.create(...) is an easy way to generate instances of these subclasses.
For more Parameter types, see ParameterTree.parameterTypes module.
=================================== =========================================================
**Signals:**
sigStateChanged(self, change, info) Emitted when anything changes about this parameter at
all.
The second argument is a string indicating what changed
('value', 'childAdded', etc..)
The third argument can be any extra information about
the change
sigTreeStateChanged(self, changes) Emitted when any child in the tree changes state
(but only if monitorChildren() is called)
the format of *changes* is [(param, change, info), ...]
sigValueChanged(self, value) Emitted when value is finished changing
sigValueChanging(self, value) Emitted immediately for all value changes,
including during editing.
sigChildAdded(self, child, index) Emitted when a child is added
sigChildRemoved(self, child) Emitted when a child is removed
sigParentChanged(self, parent) Emitted when this parameter's parent has changed
sigLimitsChanged(self, limits) Emitted when this parameter's limits have changed
sigDefaultChanged(self, default) Emitted when this parameter's default value has changed
sigNameChanged(self, name) Emitted when this parameter's name has changed
sigOptionsChanged(self, opts) Emitted when any of this parameter's options have changed
=================================== =========================================================
"""
## name, type, limits, etc.
## can also carry UI hints (slider vs spinbox, etc.)
sigValueChanged = QtCore.Signal(object, object) ## self, value emitted when value is finished being edited
sigValueChanging = QtCore.Signal(object, object) ## self, value emitted as value is being edited
sigChildAdded = QtCore.Signal(object, object, object) ## self, child, index
sigChildRemoved = QtCore.Signal(object, object) ## self, child
sigParentChanged = QtCore.Signal(object, object) ## self, parent
sigLimitsChanged = QtCore.Signal(object, object) ## self, limits
sigDefaultChanged = QtCore.Signal(object, object) ## self, default
sigNameChanged = QtCore.Signal(object, object) ## self, name
sigOptionsChanged = QtCore.Signal(object, object) ## self, {opt:val, ...}
## Emitted when anything changes about this parameter at all.
## The second argument is a string indicating what changed ('value', 'childAdded', etc..)
## The third argument can be any extra information about the change
sigStateChanged = QtCore.Signal(object, object, object) ## self, change, info
## emitted when any child in the tree changes state
## (but only if monitorChildren() is called)
sigTreeStateChanged = QtCore.Signal(object, object) # self, changes
# changes = [(param, change, info), ...]
# bad planning.
#def __new__(cls, *args, **opts):
#try:
#cls = PARAM_TYPES[opts['type']]
#except KeyError:
#pass
#return QtCore.QObject.__new__(cls, *args, **opts)
@staticmethod
def create(**opts):
"""
Create a new Parameter (or subclass) instance using opts['type'] to select the
appropriate class.
Use registerParameterType() to add new class types.
"""
typ = opts.get('type', None)
if typ is None:
cls = Parameter
else:
cls = PARAM_TYPES[opts['type']]
return cls(**opts)
def __init__(self, **opts):
QtCore.QObject.__init__(self)
self.opts = {
'type': None,
'readonly': False,
'visible': True,
'enabled': True,
'renamable': False,
'removable': False,
'strictNaming': False, # forces name to be usable as a python variable
#'limits': None, ## This is a bad plan--each parameter type may have a different data type for limits.
}
self.opts.update(opts)
self.childs = []
self.names = {} ## map name:child
self.items = weakref.WeakKeyDictionary() ## keeps track of tree items representing this parameter
self._parent = None
self.treeStateChanges = [] ## cache of tree state changes to be delivered on next emit
self.blockTreeChangeEmit = 0
#self.monitoringChildren = False ## prevent calling monitorChildren more than once
if 'value' not in self.opts:
self.opts['value'] = None
if 'name' not in self.opts or not isinstance(self.opts['name'], basestring):
raise Exception("Parameter must have a string name specified in opts.")
self.setName(opts['name'])
self.addChildren(self.opts.get('children', []))
if 'value' in self.opts and 'default' not in self.opts:
self.opts['default'] = self.opts['value']
## Connect all state changed signals to the general sigStateChanged
self.sigValueChanged.connect(lambda param, data: self.emitStateChanged('value', data))
self.sigChildAdded.connect(lambda param, *data: self.emitStateChanged('childAdded', data))
self.sigChildRemoved.connect(lambda param, data: self.emitStateChanged('childRemoved', data))
self.sigParentChanged.connect(lambda param, data: self.emitStateChanged('parent', data))
self.sigLimitsChanged.connect(lambda param, data: self.emitStateChanged('limits', data))
self.sigDefaultChanged.connect(lambda param, data: self.emitStateChanged('default', data))
self.sigNameChanged.connect(lambda param, data: self.emitStateChanged('name', data))
self.sigOptionsChanged.connect(lambda param, data: self.emitStateChanged('options', data))
#self.watchParam(self) ## emit treechange signals if our own state changes
def name(self):
return self.opts['name']
def setName(self, name):
"""Attempt to change the name of this parameter; return the actual name.
(The parameter may reject the name change or automatically pick a different name)"""
if self.opts['strictNaming']:
if len(name) < 1 or re.search(r'\W', name) or re.match(r'\d', name[0]):
raise Exception("Parameter name '%s' is invalid. (Must contain only alphanumeric and underscore characters and may not start with a number)" % name)
parent = self.parent()
if parent is not None:
name = parent._renameChild(self, name) ## first ask parent if it's ok to rename
if self.opts['name'] != name:
self.opts['name'] = name
self.sigNameChanged.emit(self, name)
return name
def type(self):
return self.opts['type']
def isType(self, typ):
"""
Return True if this parameter type matches the name *typ*.
This can occur either of two ways:
- If self.type() == *typ*
- If this parameter's class is registered with the name *typ*
"""
if self.type() == typ:
return True
global PARAM_TYPES
cls = PARAM_TYPES.get(typ, None)
if cls is None:
raise Exception("Type name '%s' is not registered." % str(typ))
return self.__class__ is cls
def childPath(self, child):
"""
Return the path of parameter names from self to child.
If child is not a (grand)child of self, return None.
"""
path = []
while child is not self:
path.insert(0, child.name())
child = child.parent()
if child is None:
return None
return path
def setValue(self, value, blockSignal=None):
## return the actual value that was set
## (this may be different from the value that was requested)
try:
if blockSignal is not None:
self.sigValueChanged.disconnect(blockSignal)
if self.opts['value'] == value:
return value
self.opts['value'] = value
self.sigValueChanged.emit(self, value)
finally:
if blockSignal is not None:
self.sigValueChanged.connect(blockSignal)
return value
def value(self):
return self.opts['value']
def getValues(self):
"""Return a tree of all values that are children of this parameter"""
vals = OrderedDict()
for ch in self:
vals[ch.name()] = (ch.value(), ch.getValues())
return vals
def saveState(self):
"""
Return a structure representing the entire state of the parameter tree.
The tree state may be restored from this structure using restoreState()
"""
state = self.opts.copy()
state['children'] = OrderedDict([(ch.name(), ch.saveState()) for ch in self])
if state['type'] is None:
global PARAM_NAMES
state['type'] = PARAM_NAMES.get(type(self), None)
return state
def restoreState(self, state, recursive=True, addChildren=True, removeChildren=True, blockSignals=True):
"""
Restore the state of this parameter and its children from a structure generated using saveState()
If recursive is True, then attempt to restore the state of child parameters as well.
If addChildren is True, then any children which are referenced in the state object will be
created if they do not already exist.
If removeChildren is True, then any children which are not referenced in the state object will
be removed.
If blockSignals is True, no signals will be emitted until the tree has been completely restored.
This prevents signal handlers from responding to a partially-rebuilt network.
"""
childState = state.get('children', [])
## list of children may be stored either as list or dict.
if isinstance(childState, dict):
childState = childState.values()
if blockSignals:
self.blockTreeChangeSignal()
try:
self.setOpts(**state)
if not recursive:
return
ptr = 0 ## pointer to first child that has not been restored yet
foundChilds = set()
#print "==============", self.name()
for ch in childState:
name = ch['name']
typ = ch['type']
#print('child: %s, %s' % (self.name()+'.'+name, typ))
## First, see if there is already a child with this name and type
gotChild = False
for i, ch2 in enumerate(self.childs[ptr:]):
#print " ", ch2.name(), ch2.type()
if ch2.name() != name or not ch2.isType(typ):
continue
gotChild = True
#print " found it"
if i != 0: ## move parameter to next position
#self.removeChild(ch2)
self.insertChild(ptr, ch2)
#print " moved to position", ptr
ch2.restoreState(ch, recursive=recursive, addChildren=addChildren, removeChildren=removeChildren)
foundChilds.add(ch2)
break
if not gotChild:
if not addChildren:
#print " ignored child"
continue
#print " created new"
ch2 = Parameter.create(**ch)
self.insertChild(ptr, ch2)
foundChilds.add(ch2)
ptr += 1
if removeChildren:
for ch in self.childs[:]:
if ch not in foundChilds:
#print " remove:", ch
self.removeChild(ch)
finally:
if blockSignals:
self.unblockTreeChangeSignal()
def defaultValue(self):
"""Return the default value for this parameter."""
return self.opts['default']
def setDefault(self, val):
"""Set the default value for this parameter."""
if self.opts['default'] == val:
return
self.opts['default'] = val
self.sigDefaultChanged.emit(self, val)
def setToDefault(self):
"""Set this parameter's value to the default."""
if self.hasDefault():
self.setValue(self.defaultValue())
def hasDefault(self):
"""Returns True if this parameter has a default value."""
return 'default' in self.opts
def valueIsDefault(self):
"""Returns True if this parameter's value is equal to the default value."""
return self.value() == self.defaultValue()
def setLimits(self, limits):
"""Set limits on the acceptable values for this parameter.
The format of limits depends on the type of the parameter and
some parameters do not make use of limits at all."""
if 'limits' in self.opts and self.opts['limits'] == limits:
return
self.opts['limits'] = limits
self.sigLimitsChanged.emit(self, limits)
return limits
def writable(self):
"""
Returns True if this parameter's value can be changed by the user.
Note that the value of the parameter can *always* be changed by
calling setValue().
"""
return not self.opts.get('readonly', False)
def setWritable(self, writable=True):
self.setOpts(readonly=not writable)
def setReadonly(self, readonly=True):
self.setOpts(readonly=readonly)
def setOpts(self, **opts):
"""
Set any arbitrary options on this parameter.
The exact behavior of this function will depend on the parameter type, but
most parameters will accept a common set of options: value, name, limits,
default, readonly, removable, renamable, visible, and enabled.
"""
changed = OrderedDict()
for k in opts:
if k == 'value':
self.setValue(opts[k])
elif k == 'name':
self.setName(opts[k])
elif k == 'limits':
self.setLimits(opts[k])
elif k == 'default':
self.setDefault(opts[k])
elif k not in self.opts or self.opts[k] != opts[k]:
self.opts[k] = opts[k]
changed[k] = opts[k]
if len(changed) > 0:
self.sigOptionsChanged.emit(self, changed)
def emitStateChanged(self, changeDesc, data):
## Emits stateChanged signal and
## requests emission of new treeStateChanged signal
self.sigStateChanged.emit(self, changeDesc, data)
#self.treeStateChanged(self, changeDesc, data)
self.treeStateChanges.append((self, changeDesc, data))
self.emitTreeChanges()
def makeTreeItem(self, depth):
"""Return a TreeWidgetItem suitable for displaying/controlling the content of this parameter.
Most subclasses will want to override this function.
"""
if hasattr(self, 'itemClass'):
#print "Param:", self, "Make item from itemClass:", self.itemClass
return self.itemClass(self, depth)
else:
return ParameterItem(self, depth=depth)
def addChild(self, child):
"""Add another parameter to the end of this parameter's child list."""
return self.insertChild(len(self.childs), child)
def addChildren(self, children):
## If children was specified as dict, then assume keys are the names.
if isinstance(children, dict):
ch2 = []
for name, opts in children.items():
if isinstance(opts, dict) and 'name' not in opts:
opts = opts.copy()
opts['name'] = name
ch2.append(opts)
children = ch2
for chOpts in children:
#print self, "Add child:", type(chOpts), id(chOpts)
self.addChild(chOpts)
def insertChild(self, pos, child):
"""
Insert a new child at pos.
If pos is a Parameter, then insert at the position of that Parameter.
If child is a dict, then a parameter is constructed as Parameter(\*\*child)
"""
if isinstance(child, dict):
child = Parameter.create(**child)
name = child.name()
if name in self.names and child is not self.names[name]:
if child.opts.get('autoIncrementName', False):
name = self.incrementName(name)
child.setName(name)
else:
raise Exception("Already have child named %s" % str(name))
if isinstance(pos, Parameter):
pos = self.childs.index(pos)
with self.treeChangeBlocker():
if child.parent() is not None:
child.remove()
self.names[name] = child
self.childs.insert(pos, child)
child.parentChanged(self)
self.sigChildAdded.emit(self, child, pos)
child.sigTreeStateChanged.connect(self.treeStateChanged)
return child
def removeChild(self, child):
"""Remove a child parameter."""
name = child.name()
if name not in self.names or self.names[name] is not child:
raise Exception("Parameter %s is not my child; can't remove." % str(child))
del self.names[name]
self.childs.pop(self.childs.index(child))
child.parentChanged(None)
self.sigChildRemoved.emit(self, child)
try:
child.sigTreeStateChanged.disconnect(self.treeStateChanged)
except TypeError: ## already disconnected
pass
def clearChildren(self):
"""Remove all child parameters."""
for ch in self.childs[:]:
self.removeChild(ch)
def children(self):
"""Return a list of this parameter's children."""
## warning -- this overrides QObject.children
return self.childs[:]
def hasChildren(self):
return len(self.childs) > 0
def parentChanged(self, parent):
"""This method is called when the parameter's parent has changed.
It may be useful to extend this method in subclasses."""
self._parent = parent
self.sigParentChanged.emit(self, parent)
def parent(self):
"""Return the parent of this parameter."""
return self._parent
def remove(self):
"""Remove this parameter from its parent's child list"""
parent = self.parent()
if parent is None:
raise Exception("Cannot remove; no parent.")
parent.removeChild(self)
def incrementName(self, name):
## return an unused name by adding a number to the name given
base, num = re.match('(.*)(\d*)', name).groups()
numLen = len(num)
if numLen == 0:
num = 2
numLen = 1
else:
num = int(num)
while True:
newName = base + ("%%0%dd"%numLen) % num
if newName not in self.names:
return newName
num += 1
def __iter__(self):
for ch in self.childs:
yield ch
def __getitem__(self, names):
"""Get the value of a child parameter. The name may also be a tuple giving
the path to a sub-parameter::
value = param[('child', 'grandchild')]
"""
if not isinstance(names, tuple):
names = (names,)
return self.param(*names).value()
def __setitem__(self, names, value):
"""Set the value of a child parameter. The name may also be a tuple giving
the path to a sub-parameter::
param[('child', 'grandchild')] = value
"""
if isinstance(names, basestring):
names = (names,)
return self.param(*names).setValue(value)
def param(self, *names):
"""Return a child parameter.
Accepts the name of the child or a tuple (path, to, child)"""
try:
param = self.names[names[0]]
except KeyError:
raise Exception("Parameter %s has no child named %s" % (self.name(), names[0]))
if len(names) > 1:
return param.param(*names[1:])
else:
return param
def __repr__(self):
return "<%s '%s' at 0x%x>" % (self.__class__.__name__, self.name(), id(self))
def __getattr__(self, attr):
## Leaving this undocumented because I might like to remove it in the future..
#print type(self), attr
if 'names' not in self.__dict__:
raise AttributeError(attr)
if attr in self.names:
return self.param(attr)
else:
raise AttributeError(attr)
def _renameChild(self, child, name):
## Only to be called from Parameter.rename
if name in self.names:
return child.name()
self.names[name] = child
del self.names[child.name()]
return name
def registerItem(self, item):
self.items[item] = None
def hide(self):
"""Hide this parameter. It and its children will no longer be visible in any ParameterTree
widgets it is connected to."""
self.show(False)
def show(self, s=True):
"""Show this parameter. """
self.opts['visible'] = s
self.sigOptionsChanged.emit(self, {'visible': s})
#def monitorChildren(self):
#if self.monitoringChildren:
#raise Exception("Already monitoring children.")
#self.watchParam(self)
#self.monitoringChildren = True
#def watchParam(self, param):
#param.sigChildAdded.connect(self.grandchildAdded)
#param.sigChildRemoved.connect(self.grandchildRemoved)
#param.sigStateChanged.connect(self.grandchildChanged)
#for ch in param:
#self.watchParam(ch)
#def unwatchParam(self, param):
#param.sigChildAdded.disconnect(self.grandchildAdded)
#param.sigChildRemoved.disconnect(self.grandchildRemoved)
#param.sigStateChanged.disconnect(self.grandchildChanged)
#for ch in param:
#self.unwatchParam(ch)
#def grandchildAdded(self, parent, child):
#self.watchParam(child)
#def grandchildRemoved(self, parent, child):
#self.unwatchParam(child)
#def grandchildChanged(self, param, change, data):
##self.sigTreeStateChanged.emit(self, param, change, data)
#self.emitTreeChange((param, change, data))
def treeChangeBlocker(self):
"""
Return an object that can be used to temporarily block and accumulate
sigTreeStateChanged signals. This is meant to be used when numerous changes are
about to be made to the tree and only one change signal should be
emitted at the end.
Example::
with param.treeChangeBlocker():
param.addChild(...)
param.removeChild(...)
param.setValue(...)
"""
return SignalBlocker(self.blockTreeChangeSignal, self.unblockTreeChangeSignal)
def blockTreeChangeSignal(self):
"""
Used to temporarily block and accumulate tree change signals.
*You must remember to unblock*, so it is advisable to use treeChangeBlocker() instead.
"""
self.blockTreeChangeEmit += 1
def unblockTreeChangeSignal(self):
"""Unblocks enission of sigTreeStateChanged and flushes the changes out through a single signal."""
self.blockTreeChangeEmit -= 1
self.emitTreeChanges()
def treeStateChanged(self, param, changes):
"""
Called when the state of any sub-parameter has changed.
========== ================================================================
Arguments:
param The immediate child whose tree state has changed.
note that the change may have originated from a grandchild.
changes List of tuples describing all changes that have been made
in this event: (param, changeDescr, data)
========== ================================================================
This function can be extended to react to tree state changes.
"""
self.treeStateChanges.extend(changes)
self.emitTreeChanges()
def emitTreeChanges(self):
if self.blockTreeChangeEmit == 0:
changes = self.treeStateChanges
self.treeStateChanges = []
self.sigTreeStateChanged.emit(self, changes)
class SignalBlocker(object):
def __init__(self, enterFn, exitFn):
self.enterFn = enterFn
self.exitFn = exitFn
def __enter__(self):
self.enterFn()
def __exit__(self, exc_type, exc_value, tb):
self.exitFn()
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