156 lines
5.7 KiB
Python
156 lines
5.7 KiB
Python
# -*- coding: utf-8 -*-
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from pyqtgraph.Qt import QtGui, QtCore
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from weakref import *
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__all__ = ['TreeWidget']
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class TreeWidget(QtGui.QTreeWidget):
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"""Extends QTreeWidget to allow internal drag/drop with widgets in the tree.
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Also maintains the expanded state of subtrees as they are moved.
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This class demonstrates the absurd lengths one must go to to make drag/drop work."""
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sigItemMoved = QtCore.Signal(object, object, object) # (item, parent, index)
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def __init__(self, parent=None):
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QtGui.QTreeWidget.__init__(self, parent)
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#self.itemWidgets = WeakKeyDictionary()
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self.setAcceptDrops(True)
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self.setDragEnabled(True)
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self.setEditTriggers(QtGui.QAbstractItemView.EditKeyPressed|QtGui.QAbstractItemView.SelectedClicked)
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self.placeholders = []
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self.childNestingLimit = None
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def setItemWidget(self, item, col, wid):
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w = QtGui.QWidget() ## foster parent / surrogate child widget
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l = QtGui.QVBoxLayout()
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l.setContentsMargins(0,0,0,0)
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w.setLayout(l)
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w.setSizePolicy(wid.sizePolicy())
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w.setMinimumHeight(wid.minimumHeight())
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w.setMinimumWidth(wid.minimumWidth())
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l.addWidget(wid)
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w.realChild = wid
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self.placeholders.append(w)
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QtGui.QTreeWidget.setItemWidget(self, item, col, w)
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def itemWidget(self, item, col):
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w = QtGui.QTreeWidget.itemWidget(self, item, col)
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if w is not None:
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w = w.realChild
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return w
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def dropMimeData(self, parent, index, data, action):
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item = self.currentItem()
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p = parent
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#print "drop", item, "->", parent, index
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while True:
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if p is None:
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break
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if p is item:
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return False
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#raise Exception("Can not move item into itself.")
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p = p.parent()
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if not self.itemMoving(item, parent, index):
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return False
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currentParent = item.parent()
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if currentParent is None:
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currentParent = self.invisibleRootItem()
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if parent is None:
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parent = self.invisibleRootItem()
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if currentParent is parent and index > parent.indexOfChild(item):
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index -= 1
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self.prepareMove(item)
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currentParent.removeChild(item)
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#print " insert child to index", index
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parent.insertChild(index, item) ## index will not be correct
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self.setCurrentItem(item)
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self.recoverMove(item)
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#self.emit(QtCore.SIGNAL('itemMoved'), item, parent, index)
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self.sigItemMoved.emit(item, parent, index)
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return True
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def itemMoving(self, item, parent, index):
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"""Called when item has been dropped elsewhere in the tree.
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Return True to accept the move, False to reject."""
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return True
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def prepareMove(self, item):
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item.__widgets = []
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item.__expanded = item.isExpanded()
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for i in range(self.columnCount()):
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w = self.itemWidget(item, i)
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item.__widgets.append(w)
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if w is None:
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continue
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w.setParent(None)
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for i in range(item.childCount()):
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self.prepareMove(item.child(i))
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def recoverMove(self, item):
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for i in range(self.columnCount()):
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w = item.__widgets[i]
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if w is None:
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continue
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self.setItemWidget(item, i, w)
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for i in range(item.childCount()):
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self.recoverMove(item.child(i))
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item.setExpanded(False) ## Items do not re-expand correctly unless they are collapsed first.
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QtGui.QApplication.instance().processEvents()
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item.setExpanded(item.__expanded)
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def collapseTree(self, item):
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item.setExpanded(False)
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for i in range(item.childCount()):
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self.collapseTree(item.child(i))
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def removeTopLevelItem(self, item):
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for i in range(self.topLevelItemCount()):
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if self.topLevelItem(i) is item:
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self.takeTopLevelItem(i)
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return
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raise Exception("Item '%s' not in top-level items." % str(item))
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def listAllItems(self, item=None):
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items = []
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if item != None:
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items.append(item)
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else:
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item = self.invisibleRootItem()
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for cindex in range(item.childCount()):
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foundItems = self.listAllItems(item=item.child(cindex))
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for f in foundItems:
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items.append(f)
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return items
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def dropEvent(self, ev):
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QtGui.QTreeWidget.dropEvent(self, ev)
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self.updateDropFlags()
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def updateDropFlags(self):
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### intended to put a limit on how deep nests of children can go.
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### self.childNestingLimit is upheld when moving items without children, but if the item being moved has children/grandchildren, the children/grandchildren
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### can end up over the childNestingLimit.
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if self.childNestingLimit == None:
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pass # enable drops in all items (but only if there are drops that aren't enabled? for performance...)
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else:
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items = self.listAllItems()
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for item in items:
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parentCount = 0
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p = item.parent()
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while p is not None:
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parentCount += 1
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p = p.parent()
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if parentCount >= self.childNestingLimit:
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item.setFlags(item.flags() & (~QtCore.Qt.ItemIsDropEnabled))
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else:
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item.setFlags(item.flags() | QtCore.Qt.ItemIsDropEnabled)
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