ca3fbe2ff9
* Added HDF5 exporter
* CSV exporter gets (x,y,y,y) export mode
* Updates to SVG, Matplotlib exporter
* Console can filter exceptions by string
* Added tick context menu to GradientEditorItem
* Added export feature to imageview
* Parameter trees:
- Option to save only user-editable values
- Option to set visible title of parameters separately from name
- Added experimental ParameterSystem for handling large systems of
interdependent parameters
- Auto-select editable portion of spinbox when editing
* Added Vector.__abs__
* Added replacement garbage collector for avoiding crashes on multithreaded Qt
* Fixed "illegal instruction" caused by closing file handle 7 on OSX
* configfile now reloads QtCore objects, Point, ColorMap, numpy arrays
* Avoid triggering recursion issues in exception handler
* Various bugfies and performance enhancements
767 lines
32 KiB
Python
767 lines
32 KiB
Python
from ..Qt import QtGui, QtCore
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import os, weakref, re
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from ..pgcollections import OrderedDict
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from ..python2_3 import asUnicode
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from .ParameterItem import ParameterItem
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PARAM_TYPES = {}
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PARAM_NAMES = {}
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def registerParameterType(name, cls, override=False):
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global PARAM_TYPES
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if name in PARAM_TYPES and not override:
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raise Exception("Parameter type '%s' already exists (use override=True to replace)" % name)
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PARAM_TYPES[name] = cls
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PARAM_NAMES[cls] = name
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def __reload__(old):
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PARAM_TYPES.update(old.get('PARAM_TYPES', {}))
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PARAM_NAMES.update(old.get('PARAM_NAMES', {}))
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class Parameter(QtCore.QObject):
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"""
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A Parameter is the basic unit of data in a parameter tree. Each parameter has
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a name, a type, a value, and several other properties that modify the behavior of the
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Parameter. Parameters may have parent / child / sibling relationships to construct
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organized hierarchies. Parameters generally do not have any inherent GUI or visual
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interpretation; instead they manage ParameterItem instances which take care of
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display and user interaction.
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Note: It is fairly uncommon to use the Parameter class directly; mostly you
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will use subclasses which provide specialized type and data handling. The static
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pethod Parameter.create(...) is an easy way to generate instances of these subclasses.
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For more Parameter types, see ParameterTree.parameterTypes module.
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=================================== =========================================================
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**Signals:**
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sigStateChanged(self, change, info) Emitted when anything changes about this parameter at
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all.
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The second argument is a string indicating what changed
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('value', 'childAdded', etc..)
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The third argument can be any extra information about
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the change
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sigTreeStateChanged(self, changes) Emitted when any child in the tree changes state
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(but only if monitorChildren() is called)
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the format of *changes* is [(param, change, info), ...]
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sigValueChanged(self, value) Emitted when value is finished changing
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sigValueChanging(self, value) Emitted immediately for all value changes,
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including during editing.
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sigChildAdded(self, child, index) Emitted when a child is added
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sigChildRemoved(self, child) Emitted when a child is removed
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sigRemoved(self) Emitted when this parameter is removed
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sigParentChanged(self, parent) Emitted when this parameter's parent has changed
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sigLimitsChanged(self, limits) Emitted when this parameter's limits have changed
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sigDefaultChanged(self, default) Emitted when this parameter's default value has changed
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sigNameChanged(self, name) Emitted when this parameter's name has changed
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sigOptionsChanged(self, opts) Emitted when any of this parameter's options have changed
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=================================== =========================================================
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"""
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## name, type, limits, etc.
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## can also carry UI hints (slider vs spinbox, etc.)
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sigValueChanged = QtCore.Signal(object, object) ## self, value emitted when value is finished being edited
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sigValueChanging = QtCore.Signal(object, object) ## self, value emitted as value is being edited
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sigChildAdded = QtCore.Signal(object, object, object) ## self, child, index
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sigChildRemoved = QtCore.Signal(object, object) ## self, child
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sigRemoved = QtCore.Signal(object) ## self
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sigParentChanged = QtCore.Signal(object, object) ## self, parent
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sigLimitsChanged = QtCore.Signal(object, object) ## self, limits
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sigDefaultChanged = QtCore.Signal(object, object) ## self, default
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sigNameChanged = QtCore.Signal(object, object) ## self, name
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sigOptionsChanged = QtCore.Signal(object, object) ## self, {opt:val, ...}
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## Emitted when anything changes about this parameter at all.
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## The second argument is a string indicating what changed ('value', 'childAdded', etc..)
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## The third argument can be any extra information about the change
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sigStateChanged = QtCore.Signal(object, object, object) ## self, change, info
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## emitted when any child in the tree changes state
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## (but only if monitorChildren() is called)
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sigTreeStateChanged = QtCore.Signal(object, object) # self, changes
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# changes = [(param, change, info), ...]
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# bad planning.
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#def __new__(cls, *args, **opts):
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#try:
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#cls = PARAM_TYPES[opts['type']]
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#except KeyError:
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#pass
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#return QtCore.QObject.__new__(cls, *args, **opts)
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@staticmethod
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def create(**opts):
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"""
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Static method that creates a new Parameter (or subclass) instance using
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opts['type'] to select the appropriate class.
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All options are passed directly to the new Parameter's __init__ method.
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Use registerParameterType() to add new class types.
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"""
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typ = opts.get('type', None)
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if typ is None:
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cls = Parameter
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else:
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cls = PARAM_TYPES[opts['type']]
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return cls(**opts)
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def __init__(self, **opts):
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"""
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Initialize a Parameter object. Although it is rare to directly create a
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Parameter instance, the options available to this method are also allowed
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by most Parameter subclasses.
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======================= =========================================================
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**Keyword Arguments:**
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name The name to give this Parameter. This is the name that
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will appear in the left-most column of a ParameterTree
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for this Parameter.
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value The value to initially assign to this Parameter.
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default The default value for this Parameter (most Parameters
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provide an option to 'reset to default').
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children A list of children for this Parameter. Children
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may be given either as a Parameter instance or as a
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dictionary to pass to Parameter.create(). In this way,
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it is possible to specify complex hierarchies of
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Parameters from a single nested data structure.
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readonly If True, the user will not be allowed to edit this
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Parameter. (default=False)
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enabled If False, any widget(s) for this parameter will appear
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disabled. (default=True)
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visible If False, the Parameter will not appear when displayed
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in a ParameterTree. (default=True)
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renamable If True, the user may rename this Parameter.
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(default=False)
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removable If True, the user may remove this Parameter.
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(default=False)
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expanded If True, the Parameter will appear expanded when
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displayed in a ParameterTree (its children will be
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visible). (default=True)
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title (str or None) If specified, then the parameter will be
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displayed to the user using this string as its name.
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However, the parameter will still be referred to
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internally using the *name* specified above. Note that
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this option is not compatible with renamable=True.
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(default=None; added in version 0.9.9)
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======================= =========================================================
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"""
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QtCore.QObject.__init__(self)
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self.opts = {
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'type': None,
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'readonly': False,
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'visible': True,
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'enabled': True,
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'renamable': False,
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'removable': False,
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'strictNaming': False, # forces name to be usable as a python variable
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'expanded': True,
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'title': None,
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#'limits': None, ## This is a bad plan--each parameter type may have a different data type for limits.
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}
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self.opts.update(opts)
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self.childs = []
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self.names = {} ## map name:child
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self.items = weakref.WeakKeyDictionary() ## keeps track of tree items representing this parameter
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self._parent = None
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self.treeStateChanges = [] ## cache of tree state changes to be delivered on next emit
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self.blockTreeChangeEmit = 0
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#self.monitoringChildren = False ## prevent calling monitorChildren more than once
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if 'value' not in self.opts:
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self.opts['value'] = None
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if 'name' not in self.opts or not isinstance(self.opts['name'], basestring):
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raise Exception("Parameter must have a string name specified in opts.")
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self.setName(opts['name'])
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self.addChildren(self.opts.get('children', []))
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if 'value' in self.opts and 'default' not in self.opts:
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self.opts['default'] = self.opts['value']
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## Connect all state changed signals to the general sigStateChanged
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self.sigValueChanged.connect(lambda param, data: self.emitStateChanged('value', data))
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self.sigChildAdded.connect(lambda param, *data: self.emitStateChanged('childAdded', data))
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self.sigChildRemoved.connect(lambda param, data: self.emitStateChanged('childRemoved', data))
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self.sigParentChanged.connect(lambda param, data: self.emitStateChanged('parent', data))
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self.sigLimitsChanged.connect(lambda param, data: self.emitStateChanged('limits', data))
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self.sigDefaultChanged.connect(lambda param, data: self.emitStateChanged('default', data))
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self.sigNameChanged.connect(lambda param, data: self.emitStateChanged('name', data))
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self.sigOptionsChanged.connect(lambda param, data: self.emitStateChanged('options', data))
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#self.watchParam(self) ## emit treechange signals if our own state changes
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def name(self):
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"""Return the name of this Parameter."""
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return self.opts['name']
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def setName(self, name):
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"""Attempt to change the name of this parameter; return the actual name.
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(The parameter may reject the name change or automatically pick a different name)"""
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if self.opts['strictNaming']:
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if len(name) < 1 or re.search(r'\W', name) or re.match(r'\d', name[0]):
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raise Exception("Parameter name '%s' is invalid. (Must contain only alphanumeric and underscore characters and may not start with a number)" % name)
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parent = self.parent()
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if parent is not None:
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name = parent._renameChild(self, name) ## first ask parent if it's ok to rename
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if self.opts['name'] != name:
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self.opts['name'] = name
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self.sigNameChanged.emit(self, name)
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return name
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def type(self):
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"""Return the type string for this Parameter."""
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return self.opts['type']
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def isType(self, typ):
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"""
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Return True if this parameter type matches the name *typ*.
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This can occur either of two ways:
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- If self.type() == *typ*
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- If this parameter's class is registered with the name *typ*
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"""
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if self.type() == typ:
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return True
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global PARAM_TYPES
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cls = PARAM_TYPES.get(typ, None)
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if cls is None:
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raise Exception("Type name '%s' is not registered." % str(typ))
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return self.__class__ is cls
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def childPath(self, child):
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"""
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Return the path of parameter names from self to child.
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If child is not a (grand)child of self, return None.
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"""
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path = []
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while child is not self:
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path.insert(0, child.name())
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child = child.parent()
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if child is None:
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return None
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return path
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def setValue(self, value, blockSignal=None):
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"""
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Set the value of this Parameter; return the actual value that was set.
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(this may be different from the value that was requested)
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"""
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try:
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if blockSignal is not None:
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self.sigValueChanged.disconnect(blockSignal)
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if self.opts['value'] == value:
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return value
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self.opts['value'] = value
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self.sigValueChanged.emit(self, value)
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finally:
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if blockSignal is not None:
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self.sigValueChanged.connect(blockSignal)
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return value
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def value(self):
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"""
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Return the value of this Parameter.
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"""
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return self.opts['value']
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def getValues(self):
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"""Return a tree of all values that are children of this parameter"""
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vals = OrderedDict()
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for ch in self:
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vals[ch.name()] = (ch.value(), ch.getValues())
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return vals
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def saveState(self, filter=None):
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"""
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Return a structure representing the entire state of the parameter tree.
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The tree state may be restored from this structure using restoreState().
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If *filter* is set to 'user', then only user-settable data will be included in the
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returned state.
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"""
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if filter is None:
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state = self.opts.copy()
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if state['type'] is None:
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global PARAM_NAMES
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state['type'] = PARAM_NAMES.get(type(self), None)
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elif filter == 'user':
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state = {'value': self.value()}
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else:
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raise ValueError("Unrecognized filter argument: '%s'" % filter)
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ch = OrderedDict([(ch.name(), ch.saveState(filter=filter)) for ch in self])
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if len(ch) > 0:
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state['children'] = ch
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return state
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def restoreState(self, state, recursive=True, addChildren=True, removeChildren=True, blockSignals=True):
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"""
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Restore the state of this parameter and its children from a structure generated using saveState()
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If recursive is True, then attempt to restore the state of child parameters as well.
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If addChildren is True, then any children which are referenced in the state object will be
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created if they do not already exist.
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If removeChildren is True, then any children which are not referenced in the state object will
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be removed.
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If blockSignals is True, no signals will be emitted until the tree has been completely restored.
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This prevents signal handlers from responding to a partially-rebuilt network.
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"""
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childState = state.get('children', [])
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## list of children may be stored either as list or dict.
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if isinstance(childState, dict):
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cs = []
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for k,v in childState.items():
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cs.append(v.copy())
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cs[-1].setdefault('name', k)
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childState = cs
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if blockSignals:
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self.blockTreeChangeSignal()
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try:
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self.setOpts(**state)
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if not recursive:
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return
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ptr = 0 ## pointer to first child that has not been restored yet
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foundChilds = set()
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#print "==============", self.name()
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for ch in childState:
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name = ch['name']
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#typ = ch.get('type', None)
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#print('child: %s, %s' % (self.name()+'.'+name, typ))
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## First, see if there is already a child with this name
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gotChild = False
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for i, ch2 in enumerate(self.childs[ptr:]):
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#print " ", ch2.name(), ch2.type()
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if ch2.name() != name: # or not ch2.isType(typ):
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continue
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gotChild = True
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#print " found it"
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if i != 0: ## move parameter to next position
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#self.removeChild(ch2)
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self.insertChild(ptr, ch2)
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#print " moved to position", ptr
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ch2.restoreState(ch, recursive=recursive, addChildren=addChildren, removeChildren=removeChildren)
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foundChilds.add(ch2)
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break
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if not gotChild:
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if not addChildren:
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#print " ignored child"
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continue
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#print " created new"
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ch2 = Parameter.create(**ch)
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self.insertChild(ptr, ch2)
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foundChilds.add(ch2)
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ptr += 1
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if removeChildren:
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for ch in self.childs[:]:
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if ch not in foundChilds:
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#print " remove:", ch
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self.removeChild(ch)
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finally:
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if blockSignals:
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self.unblockTreeChangeSignal()
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def defaultValue(self):
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"""Return the default value for this parameter."""
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return self.opts['default']
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def setDefault(self, val):
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"""Set the default value for this parameter."""
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if self.opts['default'] == val:
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return
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self.opts['default'] = val
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self.sigDefaultChanged.emit(self, val)
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def setToDefault(self):
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"""Set this parameter's value to the default."""
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if self.hasDefault():
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self.setValue(self.defaultValue())
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def hasDefault(self):
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"""Returns True if this parameter has a default value."""
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return 'default' in self.opts
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def valueIsDefault(self):
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"""Returns True if this parameter's value is equal to the default value."""
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return self.value() == self.defaultValue()
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def setLimits(self, limits):
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"""Set limits on the acceptable values for this parameter.
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The format of limits depends on the type of the parameter and
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some parameters do not make use of limits at all."""
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if 'limits' in self.opts and self.opts['limits'] == limits:
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return
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self.opts['limits'] = limits
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self.sigLimitsChanged.emit(self, limits)
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return limits
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def writable(self):
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"""
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Returns True if this parameter's value can be changed by the user.
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Note that the value of the parameter can *always* be changed by
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calling setValue().
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"""
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return not self.readonly()
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def setWritable(self, writable=True):
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"""Set whether this Parameter should be editable by the user. (This is
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exactly the opposite of setReadonly)."""
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self.setOpts(readonly=not writable)
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def readonly(self):
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"""
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Return True if this parameter is read-only. (this is the opposite of writable())
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"""
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return self.opts.get('readonly', False)
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def setReadonly(self, readonly=True):
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"""Set whether this Parameter's value may be edited by the user
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(this is the opposite of setWritable())."""
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self.setOpts(readonly=readonly)
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def setOpts(self, **opts):
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"""
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Set any arbitrary options on this parameter.
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The exact behavior of this function will depend on the parameter type, but
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most parameters will accept a common set of options: value, name, limits,
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default, readonly, removable, renamable, visible, enabled, and expanded.
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See :func:`Parameter.__init__ <pyqtgraph.parametertree.Parameter.__init__>`
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for more information on default options.
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"""
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changed = OrderedDict()
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for k in opts:
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if k == 'value':
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self.setValue(opts[k])
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elif k == 'name':
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self.setName(opts[k])
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elif k == 'limits':
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self.setLimits(opts[k])
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elif k == 'default':
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self.setDefault(opts[k])
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elif k not in self.opts or self.opts[k] != opts[k]:
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self.opts[k] = opts[k]
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changed[k] = opts[k]
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if len(changed) > 0:
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self.sigOptionsChanged.emit(self, changed)
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def emitStateChanged(self, changeDesc, data):
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## Emits stateChanged signal and
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## requests emission of new treeStateChanged signal
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self.sigStateChanged.emit(self, changeDesc, data)
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#self.treeStateChanged(self, changeDesc, data)
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self.treeStateChanges.append((self, changeDesc, data))
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self.emitTreeChanges()
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def makeTreeItem(self, depth):
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"""
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Return a TreeWidgetItem suitable for displaying/controlling the content of
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this parameter. This is called automatically when a ParameterTree attempts
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to display this Parameter.
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Most subclasses will want to override this function.
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"""
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if hasattr(self, 'itemClass'):
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#print "Param:", self, "Make item from itemClass:", self.itemClass
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return self.itemClass(self, depth)
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else:
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return ParameterItem(self, depth=depth)
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def addChild(self, child, autoIncrementName=None):
|
|
"""
|
|
Add another parameter to the end of this parameter's child list.
|
|
|
|
See insertChild() for a description of the *autoIncrementName*
|
|
argument.
|
|
"""
|
|
return self.insertChild(len(self.childs), child, autoIncrementName=autoIncrementName)
|
|
|
|
def addChildren(self, children):
|
|
"""
|
|
Add a list or dict of children to this parameter. This method calls
|
|
addChild once for each value in *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, autoIncrementName=None):
|
|
"""
|
|
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 using
|
|
:func:`Parameter.create <pyqtgraph.parametertree.Parameter.create>`.
|
|
|
|
By default, the child's 'autoIncrementName' option determines whether
|
|
the name will be adjusted to avoid prior name collisions. This
|
|
behavior may be overridden by specifying the *autoIncrementName*
|
|
argument. This argument was added in version 0.9.9.
|
|
"""
|
|
if isinstance(child, dict):
|
|
child = Parameter.create(**child)
|
|
|
|
name = child.name()
|
|
if name in self.names and child is not self.names[name]:
|
|
if autoIncrementName is True or (autoIncrementName is None and 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, RuntimeError): ## 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 True if this Parameter has children."""
|
|
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)
|
|
self.sigRemoved.emit(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 child(self, *names):
|
|
"""Return a child parameter.
|
|
Accepts the name of the child or a tuple (path, to, child)
|
|
|
|
Added in version 0.9.9. Ealier versions used the 'param' method, which is still
|
|
implemented for backward compatibility."""
|
|
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 param(self, *names):
|
|
# for backward compatibility.
|
|
return self.child(*names)
|
|
|
|
def __repr__(self):
|
|
return asUnicode("<%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:
|
|
import traceback
|
|
traceback.print_stack()
|
|
print("Warning: Use of Parameter.subParam is deprecated. Use Parameter.param(name) instead.")
|
|
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 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 = []
|
|
if len(changes) > 0:
|
|
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()
|
|
|
|
|
|
|