Thuban/UI/tree.py

#! /usr/bin/python
# Copyright (c) 2001, 2002 by Intevation GmbH
# Authors:
# Jan-Oliver Wagner <[email protected]>
# Bernhard Herzog <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

__version__ = "$Revision$"

from types import StringType, UnicodeType

from wxPython.wx import *

from Thuban import _
from Thuban.UI.common import *

from Thuban.Model.color import Color

from Thuban.Model.messages import CHANGED
from Thuban.Model.layer import Layer
from Thuban.Model.map import Map

from dialogs import NonModalDialog
from messages import SESSION_REPLACED, SELECTED_LAYER

BMP_SIZE = 15

class SessionTreeCtrl(wxTreeCtrl):

    """Widget to display a tree view of the session.

    The tree view is created recursively from the session object. The
    tree view calls the session's TreeInfo method which should return a
    pair (<title>, <item>) where <title> ist the title of the session
    item in the tree view and <items> is a list of objects to use as the
    children of the session in the tree view.

    The items list can contain three types of items:

       1. a string. The string is used as the title for a leaf item in
          the tree view.

       2. an object with a TreeInfo method. This method is called and
          should return a pair just like the session's TreeInfo method.

       3. a pair (<title>, <item>) which is treated like the return
          value of TreeInfo.
    """

    def __init__(self, parent, ID, app):

        # Use the WANTS_CHARS style so the panel doesn't eat the Return key.
        wxTreeCtrl.__init__(self, parent, ID)

        self.app = app
        # boolean to indicate that we manipulate the selection ourselves
        # so that we can ignore the selection events generated
        self.changing_selection = 0

        # Dictionary mapping layer id's to tree items
        self.layer_to_item = {}

        self.app.Subscribe(SESSION_REPLACED, self.session_changed)
        self.app.interactor.Subscribe(SELECTED_LAYER, self.layer_selected)

        # the session currently displayed in the tree
        self.session = None


        # pretend the session has changed to build the initial tree
        self.session_changed()

        EVT_TREE_SEL_CHANGED(self, self.GetId(), self.OnSelChanged)

    def unsubscribe_all(self):
        if self.session is not None:
            self.session.Unsubscribe(CHANGED, self.update_tree)
            self.session = None
        self.app.Unsubscribe(SESSION_REPLACED, self.session_changed)
        self.app.interactor.Unsubscribe(SELECTED_LAYER, self.layer_selected)

    def update_tree(self, *args):
        """Clear and rebuild the tree"""
        self.DeleteAllItems()
        self.layer_to_item.clear()
        self.image_list = wxImageList(BMP_SIZE, BMP_SIZE, False, 0)

        bmp = wxEmptyBitmap(BMP_SIZE, BMP_SIZE)
        dc = wxMemoryDC()
        dc.SelectObject(bmp)
        dc.SetBrush(wxBLACK_BRUSH)
        dc.Clear()
        dc.SelectObject(wxNullBitmap)

        self.emptyImageIndex = \
            self.image_list.AddWithColourMask(bmp, wxColour(0, 0, 0))

        self.AssignImageList(self.image_list)

        session = self.app.session
        info = session.TreeInfo()
        root = self.AddRoot(info[0], -1, -1, None)
        self.SetItemImage(root, self.emptyImageIndex)
        self.add_items(root, info[1])
        self.Expand(root)
        # select the selected layer
        selected_layer = self.app.interactor.selected_layer
        if selected_layer is not None:
            # One would expect that the selected_layer's id is in
            # layer_to_item at this point as we've just rebuilt that
            # mapping completely. However, when a new session is loaded
            # for instance, it can happen that the tree view is updated
            # before the interactor in which case selected_layer may be
            # a layer of the old session.
            item = self.layer_to_item.get(id(selected_layer))
            if item is not None:
                self.SelectItem(item)

    def add_items(self, parent, items):

        if items is None: return

        for item in items:
            if hasattr(item, "TreeInfo"):
                # Supports the TreeInfo protocol
                info = item.TreeInfo()
                treeitem = self.AppendItem(parent, info[0], -1, -1, None)
                self.SetItemImage(treeitem, self.emptyImageIndex)
                self.SetPyData(treeitem, item)
                self.add_items(treeitem, info[1])
                self.Expand(treeitem)
                if isinstance(item, Layer):
                    self.layer_to_item[id(item)] = treeitem
            elif isinstance(item, StringType) or \
                 isinstance(item, UnicodeType):
                # it's a string
                treeitem = self.AppendItem(parent, item, -1, -1, None)
                self.SetItemImage(treeitem, self.emptyImageIndex)
            else:
                # assume its a sequence (title, items)
                if isinstance(item[1], Color):

                    treeitem = self.AppendItem(parent, "(%s)" % item[0])

                    bmp = wxEmptyBitmap(BMP_SIZE, BMP_SIZE)
                    brush = wxBrush(Color2wxColour(item[1]), wxSOLID)
                    dc = wxMemoryDC()
                    dc.SelectObject(bmp)
                    dc.SetBrush(brush)
                    dc.Clear()
                    dc.DrawRoundedRectangle(0, 0, 
                                            bmp.GetWidth(), bmp.GetHeight(),
                                            4)
                    dc.SelectObject(wxNullBitmap)

                    i = self.image_list.Add(bmp)
                    self.SetItemImage(treeitem, i)
                else:
                    treeitem = self.AppendItem(parent, item[0], -1, -1, None)
                    self.SetItemImage(treeitem, self.emptyImageIndex)
                    self.add_items(treeitem, item[1])
                self.Expand(treeitem)

    def session_changed(self, *args):
        new_session = self.app.session
        # if the session has changed subscribe/unsubscribe
        if self.session is not new_session:
            if self.session is not None:
                self.session.Unsubscribe(CHANGED, self.update_tree)
            if new_session is not None:
                new_session.Subscribe(CHANGED, self.update_tree)
            self.session = new_session
        self.update_tree()

    def normalize_selection(self):
        """Select the layer or map containing currently selected item"""
        item = self.GetSelection()
        while item.IsOk():
            object = self.GetPyData(item)
            if isinstance(object, Layer) or isinstance(object, Map):
                break
            item = self.GetItemParent(item)
        else:
            # No layer or map was found in the chain of parents, so
            # there's nothing we can do.
            return

        self.changing_selection = 1
        try:
            self.SelectItem(item)
        finally:
            self.changing_selection = 0

    def SelectedLayer(self):
        """Return the layer object currently selected in the tree.
        Return None if no layer is selected"""
        layer = self.GetPyData(self.GetSelection())
        if isinstance(layer, Layer):
            return layer
        return None

    def OnSelChanged(self, event):
        if self.changing_selection:
            # we're changing the selection ourselves (probably through
            # self.normalize_selection(). ignore the event.
            return
        self.normalize_selection()
        # SelectedLayer returns None if no layer is selected. Since
        # passing None to interactor.SelectLayer deselects the layer we
        # can simply pass the result of SelectedLayer on in all cases
        self.app.interactor.SelectLayer(self.SelectedLayer())

    def layer_selected(self, layer):
        item = self.layer_to_item.get(id(layer))
        if item is not None and item != self.GetSelection():
            self.SelectItem(item)


class SessionTreeView(NonModalDialog):

    """Non modal dialog showing the session as a tree"""

    def __init__(self, parent, app, name):
        NonModalDialog.__init__(self, parent, app.interactor, name,
                                _("Session"))
        self.tree = SessionTreeCtrl(self, -1, app)

    def OnClose(self, event):
        NonModalDialog.OnClose(self, event)

        # if there were a way to get notified when the tree control
        # itself is destroyed we could use that to unsubscribe instead
        # of doing it here. (EVT_WINDOW_DESTROY doesn't seem to sent at
        # all)
        self.tree.unsubscribe_all()

1	#! /usr/bin/python
2	# Copyright (c) 2001, 2002 by Intevation GmbH
3	# Authors:
4	# Jan-Oliver Wagner <[email protected]>
5	# Bernhard Herzog <[email protected]>
6	#
7	# This program is free software under the GPL (>=v2)
8	# Read the file COPYING coming with Thuban for details.
9
10	__version__ = "$Revision$"
11
12	from types import StringType, UnicodeType
13
14	from wxPython.wx import *
15
16	from Thuban import _
17	from Thuban.UI.common import *
18
19	from Thuban.Model.color import Color
20
21	from Thuban.Model.messages import CHANGED
22	from Thuban.Model.layer import Layer
23	from Thuban.Model.map import Map
24
25	from dialogs import NonModalDialog
26	from messages import SESSION_REPLACED, SELECTED_LAYER
27
28	BMP_SIZE = 15
29
30	class SessionTreeCtrl(wxTreeCtrl):
31
32	"""Widget to display a tree view of the session.
33
34	The tree view is created recursively from the session object. The
35	tree view calls the session's TreeInfo method which should return a
36	pair (<title>, <item>) where <title> ist the title of the session
37	item in the tree view and <items> is a list of objects to use as the
38	children of the session in the tree view.
39
40	The items list can contain three types of items:
41
42	1. a string. The string is used as the title for a leaf item in
43	the tree view.
44
45	2. an object with a TreeInfo method. This method is called and
46	should return a pair just like the session's TreeInfo method.
47
48	3. a pair (<title>, <item>) which is treated like the return
49	value of TreeInfo.
50	"""
51
52	def __init__(self, parent, ID, app):
53
54	# Use the WANTS_CHARS style so the panel doesn't eat the Return key.
55	wxTreeCtrl.__init__(self, parent, ID)
56
57	self.app = app
58	# boolean to indicate that we manipulate the selection ourselves
59	# so that we can ignore the selection events generated
60	self.changing_selection = 0
61
62	# Dictionary mapping layer id's to tree items
63	self.layer_to_item = {}
64
65	self.app.Subscribe(SESSION_REPLACED, self.session_changed)
66	self.app.interactor.Subscribe(SELECTED_LAYER, self.layer_selected)
67
68	# the session currently displayed in the tree
69	self.session = None
70
71
72	# pretend the session has changed to build the initial tree
73	self.session_changed()
74
75	EVT_TREE_SEL_CHANGED(self, self.GetId(), self.OnSelChanged)
76
77	def unsubscribe_all(self):
78	if self.session is not None:
79	self.session.Unsubscribe(CHANGED, self.update_tree)
80	self.session = None
81	self.app.Unsubscribe(SESSION_REPLACED, self.session_changed)
82	self.app.interactor.Unsubscribe(SELECTED_LAYER, self.layer_selected)
83
84	def update_tree(self, *args):
85	"""Clear and rebuild the tree"""
86	self.DeleteAllItems()
87	self.layer_to_item.clear()
88	self.image_list = wxImageList(BMP_SIZE, BMP_SIZE, False, 0)
89
90	bmp = wxEmptyBitmap(BMP_SIZE, BMP_SIZE)
91	dc = wxMemoryDC()
92	dc.SelectObject(bmp)
93	dc.SetBrush(wxBLACK_BRUSH)
94	dc.Clear()
95	dc.SelectObject(wxNullBitmap)
96
97	self.emptyImageIndex = \
98	self.image_list.AddWithColourMask(bmp, wxColour(0, 0, 0))
99
100	self.AssignImageList(self.image_list)
101
102	session = self.app.session
103	info = session.TreeInfo()
104	root = self.AddRoot(info[0], -1, -1, None)
105	self.SetItemImage(root, self.emptyImageIndex)
106	self.add_items(root, info[1])
107	self.Expand(root)
108	# select the selected layer
109	selected_layer = self.app.interactor.selected_layer
110	if selected_layer is not None:
111	# One would expect that the selected_layer's id is in
112	# layer_to_item at this point as we've just rebuilt that
113	# mapping completely. However, when a new session is loaded
114	# for instance, it can happen that the tree view is updated
115	# before the interactor in which case selected_layer may be
116	# a layer of the old session.
117	item = self.layer_to_item.get(id(selected_layer))
118	if item is not None:
119	self.SelectItem(item)
120
121	def add_items(self, parent, items):
122
123	if items is None: return
124
125	for item in items:
126	if hasattr(item, "TreeInfo"):
127	# Supports the TreeInfo protocol
128	info = item.TreeInfo()
129	treeitem = self.AppendItem(parent, info[0], -1, -1, None)
130	self.SetItemImage(treeitem, self.emptyImageIndex)
131	self.SetPyData(treeitem, item)
132	self.add_items(treeitem, info[1])
133	self.Expand(treeitem)
134	if isinstance(item, Layer):
135	self.layer_to_item[id(item)] = treeitem
136	elif isinstance(item, StringType) or \
137	isinstance(item, UnicodeType):
138	# it's a string
139	treeitem = self.AppendItem(parent, item, -1, -1, None)
140	self.SetItemImage(treeitem, self.emptyImageIndex)
141	else:
142	# assume its a sequence (title, items)
143	if isinstance(item[1], Color):
144
145	treeitem = self.AppendItem(parent, "(%s)" % item[0])
146
147	bmp = wxEmptyBitmap(BMP_SIZE, BMP_SIZE)
148	brush = wxBrush(Color2wxColour(item[1]), wxSOLID)
149	dc = wxMemoryDC()
150	dc.SelectObject(bmp)
151	dc.SetBrush(brush)
152	dc.Clear()
153	dc.DrawRoundedRectangle(0, 0,
154	bmp.GetWidth(), bmp.GetHeight(),
155	4)
156	dc.SelectObject(wxNullBitmap)
157
158	i = self.image_list.Add(bmp)
159	self.SetItemImage(treeitem, i)
160	else:
161	treeitem = self.AppendItem(parent, item[0], -1, -1, None)
162	self.SetItemImage(treeitem, self.emptyImageIndex)
163	self.add_items(treeitem, item[1])
164	self.Expand(treeitem)
165
166	def session_changed(self, *args):
167	new_session = self.app.session
168	# if the session has changed subscribe/unsubscribe
169	if self.session is not new_session:
170	if self.session is not None:
171	self.session.Unsubscribe(CHANGED, self.update_tree)
172	if new_session is not None:
173	new_session.Subscribe(CHANGED, self.update_tree)
174	self.session = new_session
175	self.update_tree()
176
177	def normalize_selection(self):
178	"""Select the layer or map containing currently selected item"""
179	item = self.GetSelection()
180	while item.IsOk():
181	object = self.GetPyData(item)
182	if isinstance(object, Layer) or isinstance(object, Map):
183	break
184	item = self.GetItemParent(item)
185	else:
186	# No layer or map was found in the chain of parents, so
187	# there's nothing we can do.
188	return
189
190	self.changing_selection = 1
191	try:
192	self.SelectItem(item)
193	finally:
194	self.changing_selection = 0
195
196	def SelectedLayer(self):
197	"""Return the layer object currently selected in the tree.
198	Return None if no layer is selected"""
199	layer = self.GetPyData(self.GetSelection())
200	if isinstance(layer, Layer):
201	return layer
202	return None
203
204	def OnSelChanged(self, event):
205	if self.changing_selection:
206	# we're changing the selection ourselves (probably through
207	# self.normalize_selection(). ignore the event.
208	return
209	self.normalize_selection()
210	# SelectedLayer returns None if no layer is selected. Since
211	# passing None to interactor.SelectLayer deselects the layer we
212	# can simply pass the result of SelectedLayer on in all cases
213	self.app.interactor.SelectLayer(self.SelectedLayer())
214
215	def layer_selected(self, layer):
216	item = self.layer_to_item.get(id(layer))
217	if item is not None and item != self.GetSelection():
218	self.SelectItem(item)
219
220
221	class SessionTreeView(NonModalDialog):
222
223	"""Non modal dialog showing the session as a tree"""
224
225	def __init__(self, parent, app, name):
226	NonModalDialog.__init__(self, parent, app.interactor, name,
227	_("Session"))
228	self.tree = SessionTreeCtrl(self, -1, app)
229
230	def OnClose(self, event):
231	NonModalDialog.OnClose(self, event)
232
233	# if there were a way to get notified when the tree control
234	# itself is destroyed we could use that to unsubscribe instead
235	# of doing it here. (EVT_WINDOW_DESTROY doesn't seem to sent at
236	# all)
237	self.tree.unsubscribe_all()
238
Name	Value
svn:eol-style	native
svn:keywords	Author Date Id Revision