.. wxPython Phoenix documentation
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Copyright: (c) 2011-2018 by Total Control Software
License: wxWindows License
.. include:: headings.inc
.. currentmodule:: wx.lib.mixins.treemixin
.. highlight:: python
.. _wx.lib.mixins.treemixin.VirtualTree:
==========================================================================================================================================
|phoenix_title| **wx.lib.mixins.treemixin.VirtualTree**
==========================================================================================================================================
This is a mixin class that can be used to allow for virtual tree
controls. It can be mixed in with wx.TreeCtrl, wx.gizmos.TreeListCtrl,
wx.lib.customtree.CustomTreeCtrl.
To use it derive a new class from this class and one of the tree
controls, e.g.::
class MyTree(VirtualTree, wx.TreeCtrl):
# Other code here
VirtualTree uses several callbacks (such as OnGetItemText) to
retrieve information needed to construct the tree and render the
items. To specify what item the callback needs information about,
the callback passes an item index. Whereas for list controls a simple
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.
Note that VirtualTree forces the wx.TR_HIDE_ROOT style.
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
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.
|
|class_hierarchy| Class Hierarchy
=================================
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<img id="toggleBlock-trigger" src="_static/images/closed.png"/>
Inheritance diagram for class <strong>VirtualTree</strong>:
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<div id="toggleBlock-content" style="display:none;">
<p class="graphviz">
<center><img src="_static/images/inheritance/wx.lib.mixins.treemixin.VirtualTree_inheritance.png" alt="Inheritance diagram of VirtualTree" usemap="#dummy" class="inheritance"/></center>
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|
|super_classes| Known Superclasses
==================================
:class:`wx.lib.mixins.treemixin.TreeAPIHarmonizer`, :class:`wx.lib.mixins.treemixin.TreeHelper`
|
|method_summary| Methods Summary
================================
================================================================================ ================================================================================
:meth:`~wx.lib.mixins.treemixin.VirtualTree.__init__` Initialize self. See help(type(self)) for accurate signature.
:meth:`~wx.lib.mixins.treemixin.VirtualTree.ChildIndices`
:meth:`~wx.lib.mixins.treemixin.VirtualTree.DoRefreshItem` Refresh one item.
:meth:`~wx.lib.mixins.treemixin.VirtualTree.OnGetChildrenCount` This function *must* be overloaded in the derived class.
:meth:`~wx.lib.mixins.treemixin.VirtualTree.OnGetItemBackgroundColour` This function may be overloaded in the derived class. It
:meth:`~wx.lib.mixins.treemixin.VirtualTree.OnGetItemChecked` This function may be overloaded in the derived class, but
:meth:`~wx.lib.mixins.treemixin.VirtualTree.OnGetItemFont` This function may be overloaded in the derived class. It
:meth:`~wx.lib.mixins.treemixin.VirtualTree.OnGetItemImage` This function may be overloaded in the derived class. It
:meth:`~wx.lib.mixins.treemixin.VirtualTree.OnGetItemText` This function *must* be overloaded in the derived class. It
:meth:`~wx.lib.mixins.treemixin.VirtualTree.OnGetItemTextColour` This function may be overloaded in the derived class. It
:meth:`~wx.lib.mixins.treemixin.VirtualTree.OnGetItemType` This function may be overloaded in the derived class, but
:meth:`~wx.lib.mixins.treemixin.VirtualTree.OnItemCollapsed`
:meth:`~wx.lib.mixins.treemixin.VirtualTree.OnItemExpanding`
:meth:`~wx.lib.mixins.treemixin.VirtualTree.RefreshBackgroundColour`
:meth:`~wx.lib.mixins.treemixin.VirtualTree.RefreshCheckedState`
:meth:`~wx.lib.mixins.treemixin.VirtualTree.RefreshChildrenRecursively` Refresh the children of item, reusing as much of the
:meth:`~wx.lib.mixins.treemixin.VirtualTree.RefreshColumns`
:meth:`~wx.lib.mixins.treemixin.VirtualTree.RefreshItem` Redraws the item with the specified index.
:meth:`~wx.lib.mixins.treemixin.VirtualTree.RefreshItemFont`
:meth:`~wx.lib.mixins.treemixin.VirtualTree.RefreshItemImage`
:meth:`~wx.lib.mixins.treemixin.VirtualTree.RefreshItemRecursively` Refresh the item and its children recursively.
:meth:`~wx.lib.mixins.treemixin.VirtualTree.RefreshItems` Redraws all visible items.
:meth:`~wx.lib.mixins.treemixin.VirtualTree.RefreshItemText`
:meth:`~wx.lib.mixins.treemixin.VirtualTree.RefreshItemType`
:meth:`~wx.lib.mixins.treemixin.VirtualTree.RefreshTextColour`
================================================================================ ================================================================================
|
|api| Class API
===============
.. class:: VirtualTree(TreeAPIHarmonizer, TreeHelper)
This is a mixin class that can be used to allow for virtual tree
controls. It can be mixed in with wx.TreeCtrl, wx.gizmos.TreeListCtrl,
wx.lib.customtree.CustomTreeCtrl.
To use it derive a new class from this class and one of the tree
controls, e.g.::
class MyTree(VirtualTree, wx.TreeCtrl):
# Other code here
VirtualTree uses several callbacks (such as OnGetItemText) to
retrieve information needed to construct the tree and render the
items. To specify what item the callback needs information about,
the callback passes an item index. Whereas for list controls a simple
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.
Note that VirtualTree forces the wx.TR_HIDE_ROOT style.
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
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.
.. method:: __init__(self, \*args, \*\*kwargs)
Initialize self. See help(type(self)) for accurate signature.
.. method:: ChildIndices(self, itemIndex)
.. method:: DoRefreshItem(self, item, index, hasChildren)
Refresh one item.
.. method:: 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.
.. method:: 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.
.. method:: 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.
.. method:: 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.
.. method:: 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.
.. method:: 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.
.. method:: 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.
.. method:: 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.
.. method:: OnItemCollapsed(self, event)
.. method:: OnItemExpanding(self, event)
.. method:: RefreshBackgroundColour(self, item, index)
.. method:: RefreshCheckedState(self, item, index)
.. method:: RefreshChildrenRecursively(self, item, itemIndex=None)
Refresh the children of item, reusing as much of the
existing items in the tree as possible.
.. method:: RefreshColumns(self, item, index)
.. method:: RefreshItem(self, index)
Redraws the item with the specified index.
.. method:: RefreshItemFont(self, item, index)
.. method:: RefreshItemImage(self, item, index, hasChildren)
.. method:: RefreshItemRecursively(self, item, itemIndex)
Refresh the item and its children recursively.
.. method:: RefreshItems(self)
Redraws all visible items.
.. method:: RefreshItemText(self, item, index)
.. method:: RefreshItemType(self, item, index)
.. method:: RefreshTextColour(self, item, index)