Merge recent changes from 2.8 branch.
Make updates for recent changes on CVS HEAD. Remove or workaround deprecated items. Fix compile errors. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45088 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robin Dunn
646
wxPython/wx/lib/mixins/treemixin.py
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646
wxPython/wx/lib/mixins/treemixin.py
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@@ -0,0 +1,646 @@
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'''
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treemixin.py
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This module provides three mixin classes that can be used with tree
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controls:
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- VirtualTree is a class that, when mixed in with a tree control,
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makes the tree control virtual, similar to a ListCtrl in virtual mode.
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A virtual tree control builds the tree itself by means of callbacks,
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so the programmer is freed from the burden of building the tree herself.
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- DragAndDrop is a mixin class that helps with dragging and dropping of
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items. The graphical part of dragging and dropping tree items is done by
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this mixin class. You only need to implement the OnDrop method that is
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called when the drop happens.
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- ExpansionState is a mixin that can be queried for the expansion state of
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all items in the tree to restore it later.
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All mixin classes work with wx.TreeCtrl, wx.gizmos.TreeListCtrl,
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and wx.lib.customtree.CustomTreeCtrl. They can be used together or
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separately.
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The VirtualTree and DragAndDrop mixins force the wx.TR_HIDE_ROOT style.
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Author: Frank Niessink <frank@niessink.com>
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License: wxWidgets license
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Version: 0.9.1
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Date: 26 March 2007
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ExpansionState is based on code and ideas from Karsten Hilbert.
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Andrea Gavana provided help with the CustomTreeCtrl integration.
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'''
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import wx, wx.lib.customtreectrl
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class TreeAPIHarmonizer(object):
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''' This class attempts to hide the differences in API between the
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different tree controls that are part of wxPython. '''
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def __init__(self, *args, **kwargs):
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# CustomTreeCtrl uses a different keyword for the window style
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# argument ('ctstyle'). To hide this, we replace the 'style' keyword
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# by 'ctstyle' if we're mixed in with CustomTreeCtrl.
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if isinstance(self, wx.lib.customtreectrl.CustomTreeCtrl):
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kwargs['ctstyle'] = kwargs.pop('style', wx.TR_DEFAULT_STYLE)
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super(TreeAPIHarmonizer, self).__init__(*args, **kwargs)
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def __callSuper(self, methodName, default, *args, **kwargs):
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# If our super class has a method called methodName, call it,
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# otherwise return the default value.
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superClass = super(TreeAPIHarmonizer, self)
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if hasattr(superClass, methodName):
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return getattr(superClass, methodName)(*args, **kwargs)
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else:
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return default
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def GetColumnCount(self, *args, **kwargs):
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# Only TreeListCtrl has columns, return 0 if we are mixed in
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# with another tree control.
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return self.__callSuper('GetColumnCount', 0, *args, **kwargs)
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def GetItemType(self, *args, **kwargs):
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# Only CustomTreeCtrl has different item types, return the
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# default item type if we are mixed in with another tree control.
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return self.__callSuper('GetItemType', 0, *args, **kwargs)
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def SetItemType(self, item, newType):
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# CustomTreeCtrl doesn't support changing the item type on the fly,
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# so we create a new item and delete the old one. We currently only
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# keep the item text, would be nicer to also retain other attributes.
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text = self.GetItemText(item)
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newItem = self.InsertItem(self.GetItemParent(item), item, text,
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ct_type=newType)
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self.Delete(item)
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return newItem
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def IsItemChecked(self, *args, **kwargs):
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# Only CustomTreeCtrl supports checkable items, return False if
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# we are mixed in with another tree control.
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return self.__callSuper('IsItemChecked', False, *args, **kwargs)
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def GetItemChecked(self, *args, **kwargs):
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# For consistency's sake, provide a 'Get' and 'Set' method for
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# checkable items.
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return self.IsItemChecked(*args, **kwargs)
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def SetItemChecked(self, *args, **kwargs):
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# For consistency's sake, provide a 'Get' and 'Set' method for
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# checkable items.
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return self.CheckItem(*args, **kwargs)
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def GetMainWindow(self, *args, **kwargs):
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# Only TreeListCtrl has a separate main window, return self if we are
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# mixed in with another tree control.
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return self.__callSuper('GetMainWindow', self, *args, **kwargs)
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def GetItemImage(self, item, which=wx.TreeItemIcon_Normal, column=-1):
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# CustomTreeCtrl always wants the which argument, so provide it
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# TreeListCtr.GetItemImage has a different order of arguments than
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# the other tree controls. Hide the differenes.
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if self.GetColumnCount():
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args = (item, column, which)
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else:
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args = (item, which)
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return super(TreeAPIHarmonizer, self).GetItemImage(*args)
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def SetItemImage(self, item, imageIndex, which=wx.TreeItemIcon_Normal,
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column=-1):
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# The SetItemImage signature is different for TreeListCtrl and
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# other tree controls. This adapter method hides the differences.
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if self.GetColumnCount():
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args = (item, imageIndex, column, which)
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else:
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args = (item, imageIndex, which)
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super(TreeAPIHarmonizer, self).SetItemImage(*args)
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def UnselectAll(self):
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# Unselect all items, regardless of whether we are in multiple
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# selection mode or not.
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if self.HasFlag(wx.TR_MULTIPLE):
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super(TreeAPIHarmonizer, self).UnselectAll()
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else:
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# CustomTreeCtrl Unselect() doesn't seem to work in all cases,
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# also invoke UnselectAll just to be sure.
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self.Unselect()
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super(TreeAPIHarmonizer, self).UnselectAll()
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def GetCount(self):
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# TreeListCtrl correctly ignores the root item when it is hidden,
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# but doesn't count the root item when it is visible
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itemCount = super(TreeAPIHarmonizer, self).GetCount()
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if self.GetColumnCount() and not self.HasFlag(wx.TR_HIDE_ROOT):
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itemCount += 1
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return itemCount
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def GetSelections(self):
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# Always return a list of selected items, regardless of whether
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# we are in multiple selection mode or not.
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if self.HasFlag(wx.TR_MULTIPLE):
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selections = super(TreeAPIHarmonizer, self).GetSelections()
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else:
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selection = self.GetSelection()
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if selection:
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selections = [selection]
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else:
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selections = []
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# If the root item is hidden, it should never be selected,
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# unfortunately, CustomTreeCtrl and TreeCtrl allow it to be selected.
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if self.HasFlag(wx.TR_HIDE_ROOT):
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rootItem = self.GetRootItem()
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if rootItem and rootItem in selections:
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selections.remove(rootItem)
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return selections
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def SelectItem(self, item, *args, **kwargs):
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# Prevent the hidden root from being selected, otherwise TreeCtrl
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# crashes
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if self.HasFlag(wx.TR_HIDE_ROOT) and item == self.GetRootItem():
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return
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else:
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return super(TreeAPIHarmonizer, self).SelectItem(item, *args,
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**kwargs)
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def HitTest(self, *args, **kwargs):
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''' HitTest returns a two-tuple (item, flags) for tree controls
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without columns and a three-tuple (item, flags, column) for tree
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controls with columns. Our caller can indicate this method to
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always return a three-tuple no matter what tree control we're mixed
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in with by specifying the optional argument 'alwaysReturnColumn'
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to be True. '''
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alwaysReturnColumn = kwargs.pop('alwaysReturnColumn', False)
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hitTestResult = super(TreeAPIHarmonizer, self).HitTest(*args, **kwargs)
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if len(hitTestResult) == 2 and alwaysReturnColumn:
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hitTestResult += (0,)
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return hitTestResult
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def ExpandAll(self, item=None):
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# TreeListCtrl wants an item as argument. That's an inconsistency with
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# the TreeCtrl API. Also, TreeCtrl doesn't allow invoking ExpandAll
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# on a tree with hidden root node, so prevent that.
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if self.HasFlag(wx.TR_HIDE_ROOT):
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rootItem = self.GetRootItem()
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if rootItem:
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child, cookie = self.GetFirstChild(rootItem)
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while child:
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self.ExpandAllChildren(child)
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child, cookie = self.GetNextChild(rootItem, cookie)
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else:
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try:
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super(TreeAPIHarmonizer, self).ExpandAll()
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except TypeError:
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if item is None:
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item = self.GetRootItem()
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super(TreeAPIHarmonizer, self).ExpandAll(item)
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def ExpandAllChildren(self, item):
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# TreeListCtrl doesn't have ExpandallChildren
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try:
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super(TreeAPIHarmonizer, self).ExpandAllChildren(item)
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except AttributeError:
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self.Expand(item)
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child, cookie = self.GetFirstChild(item)
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while child:
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self.ExpandAllChildren(child)
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child, cookie = self.GetNextChild(item, cookie)
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class TreeHelper(object):
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''' This class provides methods that are not part of the API of any
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tree control, but are convenient to have available. '''
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def GetItemChildren(self, item=None, recursively=False):
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''' Return the children of item as a list. '''
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if not item:
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item = self.GetRootItem()
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if not item:
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return []
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children = []
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child, cookie = self.GetFirstChild(item)
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while child:
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children.append(child)
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if recursively:
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children.extend(self.GetItemChildren(child, True))
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child, cookie = self.GetNextChild(item, cookie)
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return children
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def GetIndexOfItem(self, item):
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''' Return the index of item. '''
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parent = self.GetItemParent(item)
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if parent:
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parentIndices = self.GetIndexOfItem(parent)
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ownIndex = self.GetItemChildren(parent).index(item)
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return parentIndices + (ownIndex,)
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else:
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return ()
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def GetItemByIndex(self, index):
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''' Return the item specified by index. '''
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item = self.GetRootItem()
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for i in index:
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children = self.GetItemChildren(item)
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item = children[i]
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return item
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class VirtualTree(TreeAPIHarmonizer, TreeHelper):
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''' This is a mixin class that can be used to allow for virtual tree
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controls. It can be mixed in with wx.TreeCtrl, wx.gizmos.TreeListCtrl,
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wx.lib.customtree.CustomTreeCtrl.
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||||
To use it derive a new class from this class and one of the tree
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||||
controls, e.g.:
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class MyTree(VirtualTree, wx.TreeCtrl):
|
||||
...
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||||
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||||
VirtualTree uses several callbacks (such as OnGetItemText) to
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retrieve information needed to construct the tree and render the
|
||||
items. To specify what item the callback needs information about,
|
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the callback passes an item index. Whereas for list controls a simple
|
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integer index can be used, for tree controls indicating a specific
|
||||
item is a little bit more complicated. See below for a more detailed
|
||||
explanation of the how index works.
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||||
|
||||
Note that VirtualTree forces the wx.TR_HIDE_ROOT style.
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||||
|
||||
In your subclass you *must* override OnGetItemText and
|
||||
OnGetChildrenCount. These two methods are the minimum needed to
|
||||
construct the tree and render the item labels. If you want to add
|
||||
images, change fonts our colours, etc., you need to override the
|
||||
appropriate OnGetXXX method as well.
|
||||
|
||||
About indices: your callbacks are passed a tuple of integers that
|
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identifies the item the VirtualTree wants information about. An
|
||||
empty tuple, i.e. (), represents the hidden root item. A tuple with
|
||||
one integer, e.g. (3,), represents a visible root item, in this case
|
||||
the fourth one. A tuple with two integers, e.g. (3,0), represents a
|
||||
child of a visible root item, in this case the first child of the
|
||||
fourth root item.
|
||||
'''
|
||||
|
||||
def __init__(self, *args, **kwargs):
|
||||
kwargs['style'] = kwargs.get('style', wx.TR_DEFAULT_STYLE) | \
|
||||
wx.TR_HIDE_ROOT
|
||||
super(VirtualTree, self).__init__(*args, **kwargs)
|
||||
self.Bind(wx.EVT_TREE_ITEM_EXPANDING, self.OnItemExpanding)
|
||||
self.Bind(wx.EVT_TREE_ITEM_COLLAPSED, self.OnItemCollapsed)
|
||||
|
||||
def OnGetChildrenCount(self, index):
|
||||
''' This function *must* be overloaded in the derived class.
|
||||
It should return the number of child items of the item with the
|
||||
provided index. If index == () it should return the number of
|
||||
root items. '''
|
||||
raise NotImplementedError
|
||||
|
||||
def OnGetItemText(self, index, column=0):
|
||||
''' This function *must* be overloaded in the derived class. It
|
||||
should return the string containing the text of the specified
|
||||
item. '''
|
||||
raise NotImplementedError
|
||||
|
||||
def OnGetItemFont(self, index):
|
||||
''' This function may be overloaded in the derived class. It
|
||||
should return the wx.Font to be used for the specified item. '''
|
||||
return wx.NullFont
|
||||
|
||||
def OnGetItemTextColour(self, index):
|
||||
''' This function may be overloaded in the derived class. It
|
||||
should return the wx.Colour to be used as text colour for the
|
||||
specified item. '''
|
||||
return wx.NullColour
|
||||
|
||||
def OnGetItemBackgroundColour(self, index):
|
||||
''' This function may be overloaded in the derived class. It
|
||||
should return the wx.Colour to be used as background colour for
|
||||
the specified item. '''
|
||||
return wx.NullColour
|
||||
|
||||
def OnGetItemImage(self, index, which=wx.TreeItemIcon_Normal, column=0):
|
||||
''' This function may be overloaded in the derived class. It
|
||||
should return the index of the image to be used. Don't forget
|
||||
to associate an ImageList with the tree control. '''
|
||||
return -1
|
||||
|
||||
def OnGetItemType(self, index):
|
||||
''' This function may be overloaded in the derived class, but
|
||||
that only makes sense when this class is mixed in with a tree
|
||||
control that supports checkable items, i.e. CustomTreeCtrl.
|
||||
This method should return whether the item is to be normal (0,
|
||||
the default), a checkbox (1) or a radiobutton (2).
|
||||
Note that OnGetItemChecked needs to be implemented as well; it
|
||||
should return whether the item is actually checked. '''
|
||||
return 0
|
||||
|
||||
def OnGetItemChecked(self, index):
|
||||
''' This function may be overloaded in the derived class, but
|
||||
that only makes sense when this class is mixed in with a tree
|
||||
control that supports checkable items, i.e. CustomTreeCtrl.
|
||||
This method should return whether the item is to be checked.
|
||||
Note that OnGetItemType should return 1 (checkbox) or 2
|
||||
(radiobutton) for this item. '''
|
||||
return False
|
||||
|
||||
def RefreshItems(self):
|
||||
''' Redraws all visible items. '''
|
||||
rootItem = self.GetRootItem()
|
||||
if not rootItem:
|
||||
rootItem = self.AddRoot('Hidden root')
|
||||
self.RefreshChildrenRecursively(rootItem)
|
||||
|
||||
def RefreshItem(self, index):
|
||||
''' Redraws the item with the specified index. '''
|
||||
item = self.GetItemByIndex(index)
|
||||
hasChildren = bool(self.OnGetChildrenCount(index))
|
||||
self.DoRefreshItem(item, index, hasChildren)
|
||||
|
||||
def RefreshChildrenRecursively(self, item, itemIndex=None):
|
||||
''' Refresh the children of item, reusing as much of the
|
||||
existing items in the tree as possible. '''
|
||||
if itemIndex is None:
|
||||
itemIndex = self.GetIndexOfItem(item)
|
||||
reusableChildren = self.GetItemChildren(item)
|
||||
for childIndex in self.ChildIndices(itemIndex):
|
||||
if reusableChildren:
|
||||
child = reusableChildren.pop(0)
|
||||
else:
|
||||
child = self.AppendItem(item, '')
|
||||
self.RefreshItemRecursively(child, childIndex)
|
||||
for child in reusableChildren:
|
||||
self.Delete(child)
|
||||
|
||||
def RefreshItemRecursively(self, item, itemIndex):
|
||||
''' Refresh the item and its children recursively. '''
|
||||
hasChildren = bool(self.OnGetChildrenCount(itemIndex))
|
||||
item = self.DoRefreshItem(item, itemIndex, hasChildren)
|
||||
# We need to refresh the children when the item is expanded and
|
||||
# when the item has no children, because in the latter case we
|
||||
# might have to delete old children from the tree:
|
||||
if self.IsExpanded(item) or not hasChildren:
|
||||
self.RefreshChildrenRecursively(item, itemIndex)
|
||||
self.SetItemHasChildren(item, hasChildren)
|
||||
|
||||
def DoRefreshItem(self, item, index, hasChildren):
|
||||
''' Refresh one item. '''
|
||||
item = self.RefreshItemType(item, index)
|
||||
self.RefreshItemText(item, index)
|
||||
self.RefreshColumns(item, index)
|
||||
self.RefreshItemFont(item, index)
|
||||
self.RefreshTextColour(item, index)
|
||||
self.RefreshBackgroundColour(item, index)
|
||||
self.RefreshItemImage(item, index, hasChildren)
|
||||
self.RefreshCheckedState(item, index)
|
||||
return item
|
||||
|
||||
def RefreshItemText(self, item, index):
|
||||
self.__refreshAttribute(item, index, 'ItemText')
|
||||
|
||||
def RefreshColumns(self, item, index):
|
||||
for columnIndex in range(1, self.GetColumnCount()):
|
||||
self.__refreshAttribute(item, index, 'ItemText', columnIndex)
|
||||
|
||||
def RefreshItemFont(self, item, index):
|
||||
self.__refreshAttribute(item, index, 'ItemFont')
|
||||
|
||||
def RefreshTextColour(self, item, index):
|
||||
self.__refreshAttribute(item, index, 'ItemTextColour')
|
||||
|
||||
def RefreshBackgroundColour(self, item, index):
|
||||
self.__refreshAttribute(item, index, 'ItemBackgroundColour')
|
||||
|
||||
def RefreshItemImage(self, item, index, hasChildren):
|
||||
regularIcons = [wx.TreeItemIcon_Normal, wx.TreeItemIcon_Selected]
|
||||
expandedIcons = [wx.TreeItemIcon_Expanded,
|
||||
wx.TreeItemIcon_SelectedExpanded]
|
||||
# Refresh images in first column:
|
||||
for icon in regularIcons:
|
||||
self.__refreshAttribute(item, index, 'ItemImage', icon)
|
||||
for icon in expandedIcons:
|
||||
if hasChildren:
|
||||
imageIndex = self.OnGetItemImage(index, icon)
|
||||
else:
|
||||
imageIndex = -1
|
||||
if self.GetItemImage(item, icon) != imageIndex or imageIndex == -1:
|
||||
self.SetItemImage(item, imageIndex, icon)
|
||||
# Refresh images in remaining columns, if any:
|
||||
for columnIndex in range(1, self.GetColumnCount()):
|
||||
for icon in regularIcons:
|
||||
self.__refreshAttribute(item, index, 'ItemImage', icon,
|
||||
columnIndex)
|
||||
|
||||
def RefreshItemType(self, item, index):
|
||||
return self.__refreshAttribute(item, index, 'ItemType')
|
||||
|
||||
def RefreshCheckedState(self, item, index):
|
||||
self.__refreshAttribute(item, index, 'ItemChecked')
|
||||
|
||||
def ChildIndices(self, itemIndex):
|
||||
childrenCount = self.OnGetChildrenCount(itemIndex)
|
||||
return [itemIndex + (childNumber,) for childNumber \
|
||||
in range(childrenCount)]
|
||||
|
||||
def OnItemExpanding(self, event):
|
||||
self.RefreshChildrenRecursively(event.GetItem())
|
||||
event.Skip()
|
||||
|
||||
def OnItemCollapsed(self, event):
|
||||
parent = self.GetItemParent(event.GetItem())
|
||||
if not parent:
|
||||
parent = self.GetRootItem()
|
||||
self.RefreshChildrenRecursively(parent)
|
||||
event.Skip()
|
||||
|
||||
def __refreshAttribute(self, item, index, attribute, *args):
|
||||
''' Refresh the specified attribute if necessary. '''
|
||||
value = getattr(self, 'OnGet%s'%attribute)(index, *args)
|
||||
if getattr(self, 'Get%s'%attribute)(item, *args) != value:
|
||||
return getattr(self, 'Set%s'%attribute)(item, value, *args)
|
||||
else:
|
||||
return item
|
||||
|
||||
|
||||
class DragAndDrop(TreeAPIHarmonizer, TreeHelper):
|
||||
''' This is a mixin class that can be used to easily implement
|
||||
dragging and dropping of tree items. It can be mixed in with
|
||||
wx.TreeCtrl, wx.gizmos.TreeListCtrl, or wx.lib.customtree.CustomTreeCtrl.
|
||||
|
||||
To use it derive a new class from this class and one of the tree
|
||||
controls, e.g.:
|
||||
class MyTree(DragAndDrop, wx.TreeCtrl):
|
||||
...
|
||||
|
||||
You *must* implement OnDrop. OnDrop is called when the user has
|
||||
dropped an item on top of another item. It's up to you to decide how
|
||||
to handle the drop. If you are using this mixin together with the
|
||||
VirtualTree mixin, it makes sense to rearrange your underlying data
|
||||
and then call RefreshItems to let the virtual tree refresh itself. '''
|
||||
|
||||
def __init__(self, *args, **kwargs):
|
||||
kwargs['style'] = kwargs.get('style', wx.TR_DEFAULT_STYLE) | \
|
||||
wx.TR_HIDE_ROOT
|
||||
super(DragAndDrop, self).__init__(*args, **kwargs)
|
||||
self.Bind(wx.EVT_TREE_BEGIN_DRAG, self.OnBeginDrag)
|
||||
|
||||
def OnDrop(self, dropItem, dragItem):
|
||||
''' This function must be overloaded in the derived class.
|
||||
dragItem is the item being dragged by the user. dropItem is the
|
||||
item dragItem is dropped upon. If the user doesn't drop dragItem
|
||||
on another item, dropItem equals the (hidden) root item of the
|
||||
tree control. '''
|
||||
raise NotImplementedError
|
||||
|
||||
def OnBeginDrag(self, event):
|
||||
# We allow only one item to be dragged at a time, to keep it simple
|
||||
self._dragItem = event.GetItem()
|
||||
if self._dragItem and self._dragItem != self.GetRootItem():
|
||||
self.StartDragging()
|
||||
event.Allow()
|
||||
else:
|
||||
event.Veto()
|
||||
|
||||
def OnEndDrag(self, event):
|
||||
self.StopDragging()
|
||||
dropTarget = event.GetItem()
|
||||
if not dropTarget:
|
||||
dropTarget = self.GetRootItem()
|
||||
if self.IsValidDropTarget(dropTarget):
|
||||
self.UnselectAll()
|
||||
if dropTarget != self.GetRootItem():
|
||||
self.SelectItem(dropTarget)
|
||||
self.OnDrop(dropTarget, self._dragItem)
|
||||
|
||||
def OnDragging(self, event):
|
||||
if not event.Dragging():
|
||||
self.StopDragging()
|
||||
return
|
||||
item, flags, column = self.HitTest(wx.Point(event.GetX(), event.GetY()),
|
||||
alwaysReturnColumn=True)
|
||||
if not item:
|
||||
item = self.GetRootItem()
|
||||
if self.IsValidDropTarget(item):
|
||||
self.SetCursorToDragging()
|
||||
else:
|
||||
self.SetCursorToDroppingImpossible()
|
||||
if flags & wx.TREE_HITTEST_ONITEMBUTTON:
|
||||
self.Expand(item)
|
||||
if self.GetSelections() != [item]:
|
||||
self.UnselectAll()
|
||||
if item != self.GetRootItem():
|
||||
self.SelectItem(item)
|
||||
event.Skip()
|
||||
|
||||
def StartDragging(self):
|
||||
self.GetMainWindow().Bind(wx.EVT_MOTION, self.OnDragging)
|
||||
self.Bind(wx.EVT_TREE_END_DRAG, self.OnEndDrag)
|
||||
self.SetCursorToDragging()
|
||||
|
||||
def StopDragging(self):
|
||||
self.GetMainWindow().Unbind(wx.EVT_MOTION)
|
||||
self.Unbind(wx.EVT_TREE_END_DRAG)
|
||||
self.ResetCursor()
|
||||
self.UnselectAll()
|
||||
self.SelectItem(self._dragItem)
|
||||
|
||||
def SetCursorToDragging(self):
|
||||
self.GetMainWindow().SetCursor(wx.StockCursor(wx.CURSOR_HAND))
|
||||
|
||||
def SetCursorToDroppingImpossible(self):
|
||||
self.GetMainWindow().SetCursor(wx.StockCursor(wx.CURSOR_NO_ENTRY))
|
||||
|
||||
def ResetCursor(self):
|
||||
self.GetMainWindow().SetCursor(wx.NullCursor)
|
||||
|
||||
def IsValidDropTarget(self, dropTarget):
|
||||
if dropTarget:
|
||||
allChildren = self.GetItemChildren(self._dragItem, recursively=True)
|
||||
parent = self.GetItemParent(self._dragItem)
|
||||
return dropTarget not in [self._dragItem, parent] + allChildren
|
||||
else:
|
||||
return True
|
||||
|
||||
|
||||
class ExpansionState(TreeAPIHarmonizer, TreeHelper):
|
||||
''' This is a mixin class that can be used to save and restore
|
||||
the expansion state (i.e. which items are expanded and which items
|
||||
are collapsed) of a tree. It can be mixed in with wx.TreeCtrl,
|
||||
wx.gizmos.TreeListCtrl, or wx.lib.customtree.CustomTreeCtrl.
|
||||
|
||||
To use it derive a new class from this class and one of the tree
|
||||
controls, e.g.:
|
||||
class MyTree(ExpansionState, wx.TreeCtrl):
|
||||
...
|
||||
|
||||
By default, ExpansionState uses the position of tree items in the tree
|
||||
to keep track of which items are expanded. This should be sufficient
|
||||
for the simple scenario where you save the expansion state of the tree
|
||||
when the user closes the application or file so that you can restore
|
||||
the expansion state when the user start the application or loads that
|
||||
file for the next session.
|
||||
|
||||
If you need to add or remove items between the moments of saving and
|
||||
restoring the expansion state (e.g. in case of a multi-user application)
|
||||
you must override GetItemIdentity so that saving and loading of the
|
||||
expansion doesn't depend on the position of items in the tree, but
|
||||
rather on some more stable characteristic of the underlying domain
|
||||
object, e.g. a social security number in case of persons or an isbn
|
||||
number in case of books. '''
|
||||
|
||||
def GetItemIdentity(self, item):
|
||||
''' Return a hashable object that represents the identity of the
|
||||
item. By default this returns the position of the item in the
|
||||
tree. You may want to override this to return the item label
|
||||
(if you know that labels are unique and don't change), or return
|
||||
something that represents the underlying domain object, e.g.
|
||||
a database key. '''
|
||||
return self.GetIndexOfItem(item)
|
||||
|
||||
def GetExpansionState(self):
|
||||
''' GetExpansionState() -> list of expanded items. Expanded items
|
||||
are coded as determined by the result of GetItemIdentity(item). '''
|
||||
root = self.GetRootItem()
|
||||
if not root:
|
||||
return []
|
||||
if self.HasFlag(wx.TR_HIDE_ROOT):
|
||||
return self.GetExpansionStateOfChildren(root)
|
||||
else:
|
||||
return self.GetExpansionStateOfItem(root)
|
||||
|
||||
def SetExpansionState(self, listOfExpandedItems):
|
||||
''' SetExpansionState(listOfExpandedItems). Expands all tree items
|
||||
whose identity, as determined by GetItemIdentity(item), is present
|
||||
in the list and collapses all other tree items. '''
|
||||
root = self.GetRootItem()
|
||||
if not root:
|
||||
return
|
||||
if self.HasFlag(wx.TR_HIDE_ROOT):
|
||||
self.SetExpansionStateOfChildren(listOfExpandedItems, root)
|
||||
else:
|
||||
self.SetExpansionStateOfItem(listOfExpandedItems, root)
|
||||
|
||||
ExpansionState = property(GetExpansionState, SetExpansionState)
|
||||
|
||||
def GetExpansionStateOfItem(self, item):
|
||||
listOfExpandedItems = []
|
||||
if self.IsExpanded(item):
|
||||
listOfExpandedItems.append(self.GetItemIdentity(item))
|
||||
listOfExpandedItems.extend(self.GetExpansionStateOfChildren(item))
|
||||
return listOfExpandedItems
|
||||
|
||||
def GetExpansionStateOfChildren(self, item):
|
||||
listOfExpandedItems = []
|
||||
for child in self.GetItemChildren(item):
|
||||
listOfExpandedItems.extend(self.GetExpansionStateOfItem(child))
|
||||
return listOfExpandedItems
|
||||
|
||||
def SetExpansionStateOfItem(self, listOfExpandedItems, item):
|
||||
if self.GetItemIdentity(item) in listOfExpandedItems:
|
||||
self.Expand(item)
|
||||
self.SetExpansionStateOfChildren(listOfExpandedItems, item)
|
||||
else:
|
||||
self.Collapse(item)
|
||||
|
||||
def SetExpansionStateOfChildren(self, listOfExpandedItems, item):
|
||||
for child in self.GetItemChildren(item):
|
||||
self.SetExpansionStateOfItem(listOfExpandedItems, child)
|
||||
Reference in New Issue
Block a user