172 lines
6.4 KiB
Python
172 lines
6.4 KiB
Python
from ..Qt import QtGui, QtCore
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from ..python2_3 import asUnicode
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import os, weakref, re
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class ParameterItem(QtGui.QTreeWidgetItem):
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"""
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Abstract ParameterTree item.
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Used to represent the state of a Parameter from within a ParameterTree.
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- Sets first column of item to name
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- generates context menu if item is renamable or removable
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- handles child added / removed events
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- provides virtual functions for handling changes from parameter
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For more ParameterItem types, see ParameterTree.parameterTypes module.
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"""
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def __init__(self, param, depth=0):
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title = param.opts.get('title', None)
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if title is None:
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title = param.name()
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QtGui.QTreeWidgetItem.__init__(self, [title, ''])
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self.param = param
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self.param.registerItem(self) ## let parameter know this item is connected to it (for debugging)
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self.depth = depth
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param.sigValueChanged.connect(self.valueChanged)
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param.sigChildAdded.connect(self.childAdded)
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param.sigChildRemoved.connect(self.childRemoved)
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param.sigNameChanged.connect(self.nameChanged)
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param.sigLimitsChanged.connect(self.limitsChanged)
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param.sigDefaultChanged.connect(self.defaultChanged)
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param.sigOptionsChanged.connect(self.optsChanged)
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param.sigParentChanged.connect(self.parentChanged)
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opts = param.opts
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## Generate context menu for renaming/removing parameter
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self.contextMenu = QtGui.QMenu()
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self.contextMenu.addSeparator()
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flags = QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsEnabled
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if opts.get('renamable', False):
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if param.opts.get('title', None) is not None:
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raise Exception("Cannot make parameter with both title != None and renamable == True.")
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flags |= QtCore.Qt.ItemIsEditable
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self.contextMenu.addAction('Rename').triggered.connect(self.editName)
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if opts.get('removable', False):
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self.contextMenu.addAction("Remove").triggered.connect(self.requestRemove)
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## handle movable / dropEnabled options
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if opts.get('movable', False):
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flags |= QtCore.Qt.ItemIsDragEnabled
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if opts.get('dropEnabled', False):
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flags |= QtCore.Qt.ItemIsDropEnabled
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self.setFlags(flags)
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## flag used internally during name editing
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self.ignoreNameColumnChange = False
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def valueChanged(self, param, val):
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## called when the parameter's value has changed
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pass
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def isFocusable(self):
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"""Return True if this item should be included in the tab-focus order"""
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return False
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def setFocus(self):
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"""Give input focus to this item.
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Can be reimplemented to display editor widgets, etc.
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"""
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pass
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def focusNext(self, forward=True):
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"""Give focus to the next (or previous) focusable item in the parameter tree"""
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self.treeWidget().focusNext(self, forward=forward)
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def treeWidgetChanged(self):
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"""Called when this item is added or removed from a tree.
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Expansion, visibility, and column widgets must all be configured AFTER
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the item is added to a tree, not during __init__.
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"""
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self.setHidden(not self.param.opts.get('visible', True))
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self.setExpanded(self.param.opts.get('expanded', True))
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def childAdded(self, param, child, pos):
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item = child.makeTreeItem(depth=self.depth+1)
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self.insertChild(pos, item)
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item.treeWidgetChanged()
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for i, ch in enumerate(child):
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item.childAdded(child, ch, i)
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def childRemoved(self, param, child):
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for i in range(self.childCount()):
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item = self.child(i)
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if item.param is child:
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self.takeChild(i)
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break
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def parentChanged(self, param, parent):
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## called when the parameter's parent has changed.
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pass
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def contextMenuEvent(self, ev):
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if not self.param.opts.get('removable', False) and not self.param.opts.get('renamable', False):
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return
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self.contextMenu.popup(ev.globalPos())
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def columnChangedEvent(self, col):
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"""Called when the text in a column has been edited (or otherwise changed).
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By default, we only use changes to column 0 to rename the parameter.
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"""
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if col == 0 and (self.param.opts.get('title', None) is None):
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if self.ignoreNameColumnChange:
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return
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try:
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newName = self.param.setName(asUnicode(self.text(col)))
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except Exception:
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self.setText(0, self.param.name())
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raise
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try:
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self.ignoreNameColumnChange = True
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self.nameChanged(self, newName) ## If the parameter rejects the name change, we need to set it back.
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finally:
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self.ignoreNameColumnChange = False
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def nameChanged(self, param, name):
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## called when the parameter's name has changed.
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if self.param.opts.get('title', None) is None:
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self.setText(0, name)
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def limitsChanged(self, param, limits):
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"""Called when the parameter's limits have changed"""
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pass
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def defaultChanged(self, param, default):
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"""Called when the parameter's default value has changed"""
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pass
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def optsChanged(self, param, opts):
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"""Called when any options are changed that are not
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name, value, default, or limits"""
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#print opts
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if 'visible' in opts:
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self.setHidden(not opts['visible'])
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def editName(self):
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self.treeWidget().editItem(self, 0)
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def selected(self, sel):
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"""Called when this item has been selected (sel=True) OR deselected (sel=False)"""
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pass
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def requestRemove(self):
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## called when remove is selected from the context menu.
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## we need to delay removal until the action is complete
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## since destroying the menu in mid-action will cause a crash.
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QtCore.QTimer.singleShot(0, self.param.remove)
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## for python 3 support, we need to redefine hash and eq methods.
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def __hash__(self):
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return id(self)
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def __eq__(self, x):
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return x is self
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