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#! /usr/bin/python |
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# Copyright (c) 2001, 2002 by Intevation GmbH |
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# Authors: |
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# Jan-Oliver Wagner <[email protected]> |
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# Bernhard Herzog <[email protected]> |
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# |
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# This program is free software under the GPL (>=v2) |
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# Read the file COPYING coming with Thuban for details. |
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|
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__version__ = "$Revision$" |
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|
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from types import StringType, UnicodeType |
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|
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from wxPython.wx import * |
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|
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from Thuban import _ |
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|
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from Thuban.Model.color import Color |
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|
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from Thuban.Model.messages import CHANGED |
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from Thuban.Model.layer import Layer |
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from Thuban.Model.map import Map |
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|
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from dialogs import NonModalDialog |
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from messages import SESSION_CHANGED, SELECTED_LAYER |
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|
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BMP_SIZE = 15 |
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|
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class SessionTreeCtrl(wxTreeCtrl): |
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|
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"""Widget to display a tree view of the session. |
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|
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The tree view is created recursively from the session object. The |
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tree view calls the session's TreeInfo method which should return a |
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pair (<title>, <item>) where <title> ist the title of the session |
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item in the tree view and <items> is a list of objects to use as the |
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children of the session in the tree view. |
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|
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The items list can contain three types of items: |
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|
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1. a string. The string is used as the title for a leaf item in |
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the tree view. |
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|
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2. an object with a TreeInfo method. This method is called and |
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should return a pair just like the session's TreeInfo method. |
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|
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3. a pair (<title>, <item>) which is treated like the return |
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value of TreeInfo. |
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""" |
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|
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def __init__(self, parent, ID, app): |
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|
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# Use the WANTS_CHARS style so the panel doesn't eat the Return key. |
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wxTreeCtrl.__init__(self, parent, ID) |
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|
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self.app = app |
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# boolean to indicate that we manipulate the selection ourselves |
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# so that we can ignore the selection events generated |
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self.changing_selection = 0 |
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|
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# Dictionary mapping layer id's to tree items |
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self.layer_to_item = {} |
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|
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self.app.Subscribe(SESSION_CHANGED, self.session_changed) |
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self.app.interactor.Subscribe(SELECTED_LAYER, self.layer_selected) |
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|
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# the session currently displayed in the tree |
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self.session = None |
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|
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self.image_list = wxImageList(BMP_SIZE, BMP_SIZE) |
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self.AssignImageList(self.image_list) |
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|
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# pretend the session has changed to build the initial tree |
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self.session_changed() |
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|
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EVT_TREE_SEL_CHANGED(self, self.GetId(), self.OnSelChanged) |
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|
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def unsubscribe_all(self): |
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if self.session is not None: |
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self.session.Unsubscribe(CHANGED, self.update_tree) |
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self.session = None |
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self.app.Unsubscribe(SESSION_CHANGED, self.session_changed) |
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self.app.interactor.Unsubscribe(SELECTED_LAYER, self.layer_selected) |
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|
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def update_tree(self, *args): |
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"""Clear and rebuild the tree""" |
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self.DeleteAllItems() |
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self.layer_to_item.clear() |
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|
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session = self.app.session |
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info = session.TreeInfo() |
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root = self.AddRoot(info[0]) |
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self.add_items(root, info[1]) |
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self.Expand(root) |
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# select the selected layer |
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selected_layer = self.app.interactor.selected_layer |
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if selected_layer is not None: |
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# One would expect that the selected_layer's id is in |
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# layer_to_item at this point as we've just rebuilt that |
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# mapping completely. However, when a new session is loaded |
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# for instance, it can happen that the tree view is updated |
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# before the interactor in which case selected_layer may be |
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# a layer of the old session. |
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item = self.layer_to_item.get(id(selected_layer)) |
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if item is not None: |
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self.SelectItem(item) |
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|
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def add_items(self, parent, items): |
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# print "\n---\n", items |
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if items is None: return |
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for item in items: |
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if hasattr(item, "TreeInfo"): |
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# Supports the TreeInfo protocol |
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info = item.TreeInfo() |
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treeitem = self.AppendItem(parent, info[0]) |
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self.SetPyData(treeitem, item) |
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self.add_items(treeitem, info[1]) |
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self.Expand(treeitem) |
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if isinstance(item, Layer): |
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self.layer_to_item[id(item)] = treeitem |
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elif isinstance(item, StringType) or \ |
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isinstance(item, UnicodeType): |
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# it's a string |
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self.AppendItem(parent, item) |
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else: |
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# assume its a sequence (title, items) |
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if isinstance(item[1], Color): |
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treeitem = self.AppendItem(parent, _("(%s)") % item[0]) |
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|
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bmp = wxEmptyBitmap(BMP_SIZE, BMP_SIZE) |
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brush = wxBrush(wxColour(item[1].red * 255, |
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item[1].green * 255, |
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item[1].blue * 255), |
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wxSOLID) |
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dc = wxMemoryDC() |
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dc.SelectObject(bmp) |
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dc.SetBrush(brush) |
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dc.Clear() |
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dc.DrawRoundedRectangle(0, 0, |
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bmp.GetWidth(), bmp.GetHeight(), |
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4) |
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dc.SelectObject(wxNullBitmap) |
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|
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i = self.image_list.Add(bmp) |
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self.SetItemImage(treeitem, i) |
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else: |
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treeitem = self.AppendItem(parent, item[0]) |
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self.add_items(treeitem, item[1]) |
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self.Expand(treeitem) |
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|
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def session_changed(self, *args): |
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new_session = self.app.session |
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# if the session has changed subscribe/unsubscribe |
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if self.session is not new_session: |
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if self.session is not None: |
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self.session.Unsubscribe(CHANGED, self.update_tree) |
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if new_session is not None: |
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new_session.Subscribe(CHANGED, self.update_tree) |
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self.session = new_session |
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self.update_tree() |
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|
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def normalize_selection(self): |
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"""Select the layer or map containing currently selected item""" |
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item = self.GetSelection() |
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while item.IsOk(): |
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object = self.GetPyData(item) |
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if isinstance(object, Layer) or isinstance(object, Map): |
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break |
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item = self.GetItemParent(item) |
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else: |
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# No layer or map was found in the chain of parents, so |
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# there's nothing we can do. |
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return |
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self.changing_selection = 1 |
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try: |
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self.SelectItem(item) |
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finally: |
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self.changing_selection = 0 |
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|
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def SelectedLayer(self): |
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"""Return the layer object currently selected in the tree. |
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Return None if no layer is selected""" |
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layer = self.GetPyData(self.GetSelection()) |
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if isinstance(layer, Layer): |
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return layer |
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return None |
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|
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def OnSelChanged(self, event): |
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if self.changing_selection: |
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# we're changing the selection ourselves (probably through |
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# self.normalize_selection(). ignore the event. |
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return |
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self.normalize_selection() |
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# SelectedLayer returns None if no layer is selected. Since |
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# passing None to interactor.SelectLayer deselects the layer we |
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# can simply pass the result of SelectedLayer on in all cases |
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self.app.interactor.SelectLayer(self.SelectedLayer()) |
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|
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def layer_selected(self, layer): |
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item = self.layer_to_item.get(id(layer)) |
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if item is not None and item != self.GetSelection(): |
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self.SelectItem(item) |
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|
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|
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class SessionTreeView(NonModalDialog): |
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"""Non modal dialog showing the session as a tree""" |
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def __init__(self, parent, app, name): |
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NonModalDialog.__init__(self, parent, app.interactor, name, |
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_("Session")) |
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self.tree = SessionTreeCtrl(self, -1, app) |
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|
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def OnClose(self, event): |
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#self.interactor.Unsubscribe(SELECTED_SHAPE, self.select_shape) |
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NonModalDialog.OnClose(self, event) |
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# if there were a way to get notified when the tree control |
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# itself is destroyed we could use that to unsubscribe instead |
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# of doing it here. (EVT_WINDOW_DESTROY doesn't seem to sent at |
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# all) |
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self.tree.unsubscribe_all() |
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