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topic_selector.py
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topic_selector.py
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"""\
The selector that is used to select a topic from a list of topics.
"""
import wx
import wx.lib.mixins.listctrl as listmix
from passage_list import get_primary_passage_list_manager
from util.observerlist import ObserverList
class TopicListCtrl(wx.ListCtrl, listmix.ListCtrlAutoWidthMixin):
def __init__(self, parent, ID=-1, pos=wx.DefaultPosition,
size=wx.DefaultSize, style=0):
wx.ListCtrl.__init__(self, parent, ID, pos, size, style)
listmix.ListCtrlAutoWidthMixin.__init__(self)
class TopicSelector(wx.TextCtrl):
"""This control is used to select a topic.
It uses a filterable drop down list to suggest topics, somewhat similar
to the Firefox URL suggestion list.
"""
def __init__(self, parent):
super(TopicSelector, self).__init__(parent, style=wx.TE_PROCESS_ENTER)
self._manager = get_primary_passage_list_manager()
self._dropdown = wx.PopupWindow(self)
self._setup_list()
self._selected_topic = None
self.topic_changed_observers = ObserverList()
# Called when return is pressed and the drop down is not shown.
self.return_pressed_observers = ObserverList()
self._bind_events()
self.selected_topic = self._manager
def maybe_create_topic_from_text(self):
"""If the text in the text box is not the currently selected topic,
then create a new topic with that name.
"""
text = self.GetValue()
if text.lower() == self.selected_topic.full_name.lower():
return
self.selected_topic = self._manager.find_or_create_topic(text)
def get_selected_topic(self):
return self._selected_topic
def set_selected_topic(self, topic):
selected_topic_changed = (topic is not self._selected_topic)
self._selected_topic = topic
self._update_topic_text()
if selected_topic_changed:
self.topic_changed_observers(topic)
selected_topic = property(get_selected_topic, set_selected_topic,
doc="The currently selected topic for the control.")
def _bind_events(self):
self.Bind(wx.EVT_TEXT, self._on_text_changed)
self.Bind(wx.EVT_KEY_DOWN, self._on_key_down)
self.Bind(wx.EVT_SET_FOCUS, self._on_focus_got)
self.Bind(wx.EVT_KILL_FOCUS, self._on_focus_lost)
def _setup_list(self):
self._topic_list = TopicListCtrl(self._dropdown,
pos=(0, 0),
style=wx.LC_REPORT | wx.LC_NO_HEADER | wx.LC_SINGLE_SEL)
self._topic_list.Bind(wx.EVT_LEFT_DOWN, self._on_list_clicked)
def _setup_dropdown_data(self):
filter = self.GetValue()
if filter:
if ">" in filter:
filtered_words = [filter.lower()]
else:
filtered_words = [word.strip() for word in filter.lower().split()
if (word and word != ">")]
filtered_topics = [(name, index) for index, (name, _) in enumerate(self._topics)
if all(filtered_word in name.lower() for filtered_word in filtered_words)]
else:
filtered_topics = [(name, index) for index, (name, _) in enumerate(self._topics)]
if not filtered_topics:
return False
longest_topic = max(len(name) for name, _ in filtered_topics)
width = self.GetSize()[0]
width = max(self._topic_list.GetCharWidth() * (longest_topic + 10), width)
height = self._topic_list.GetCharHeight() * (min(len(filtered_topics), 7) + 2)
size = (width, height)
self._topic_list.SetSize(size)
self._dropdown.SetClientSize(size)
self._topic_list.DeleteAllColumns()
self._topic_list.DeleteAllItems()
self._topic_list.InsertColumn(0, "")
for index, (name, index2) in enumerate(filtered_topics):
self._topic_list.InsertStringItem(index, name)
self._topic_list.SetItemData(index, index2)
self._topic_list._doResize()
return True
def _update_topics(self):
"""Updates the list of topics used in the dropdown.
XXX: This list is rebuilt far too frequently. We should be more
clever about rebuilding it.
"""
self._topics = []
self._get_topics(self._manager)
def _get_topics(self, topic):
if topic.is_special_topic:
return
self._topics.append((topic.full_name, topic))
for subtopic in topic.subtopics:
self._get_topics(subtopic)
def _update_topic_text(self):
if self._selected_topic is None:
self.ChangeValue(_("None"))
else:
self.ChangeValue(self._selected_topic.full_name)
self.SetInsertionPoint(0)
def _on_text_changed(self, event):
self._show_dropdown()
def _on_key_down(self, event):
keycode = event.GetKeyCode()
selection = self._topic_list.GetFirstSelected()
if keycode == wx.WXK_RETURN and not self._dropdown.IsShown():
self.return_pressed_observers()
return
if not self._dropdown.IsShown():
event.Skip()
return
if keycode == wx.WXK_DOWN:
if selection + 1 < self._topic_list.GetItemCount():
self._topic_list.Select(selection + 1)
self._topic_list.EnsureVisible(selection + 1)
elif keycode == wx.WXK_UP:
if selection > 0 :
self._topic_list.Select(selection - 1)
self._topic_list.EnsureVisible(selection - 1)
elif keycode == wx.WXK_RETURN:
self._hide_dropdown()
self._select_currently_selected()
elif keycode == wx.WXK_ESCAPE:
self._hide_dropdown()
self._update_topic_text()
else:
event.Skip()
def _on_list_clicked(self, event):
selection, flag = self._topic_list.HitTest(event.GetPosition())
if selection == -1:
return
self._topic_list.Select(selection)
self._select_currently_selected()
self._hide_dropdown()
def _select_currently_selected(self):
selection = self._topic_list.GetFirstSelected()
if selection == -1:
selection = 0
if self._topic_list.GetItemCount() == 0:
return
topic_index = self._topic_list.GetItemData(selection)
self.selected_topic = self._topics[topic_index][1]
def _on_focus_got(self, event):
self.SetInsertionPoint(0)
self.SetSelection(-1, -1)
def _on_focus_lost(self, event):
self._hide_dropdown()
def _show_dropdown(self):
if not self._dropdown.IsShown():
self._update_topics()
if not self._setup_dropdown_data():
self._hide_dropdown()
return
position = self.ClientToScreen((0, 0))
width, height = self.GetSize()
self._dropdown.Position(position, (0, height))
self._dropdown.Show()
def _hide_dropdown(self):
self._dropdown.Hide()