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#!/usr/bin/env python
import pygtk
pygtk.require('2.0')
import gtk
import pango
import xml.sax
class RichTextBuffer(gtk.TextBuffer):
def __init__(self):
gtk.TextBuffer.__init__(self)
self.connect_after("insert-text", self.__insert_text_cb)
self.__create_tags()
self.active_tags = []
def apply_tag(self, tag_name):
self.active_tags.append(tag_name)
bounds = self.get_selection_bounds()
if bounds:
[start, end] = bounds
self.apply_tag_by_name(tag_name, start, end)
def unapply_tag(self, tag_name):
self.active_tags.remove(tag_name)
[start, end] = self.get_selection_bounds()
self.remove_tag_by_name(tag_name, start, end)
def __create_tags(self):
tag = self.create_tag("bold")
tag.set_property("weight", pango.WEIGHT_BOLD)
tag = self.create_tag("italic")
tag.set_property("style", pango.STYLE_ITALIC)
def __insert_text_cb(self, widget, pos, text, length):
for tag in self.active_tags:
pos_end = pos.copy()
pos_end.backward_chars(length)
self.apply_tag_by_name(tag, pos, pos_end)
class RichTextToolbar(gtk.Toolbar):
def __init__(self, buf):
gtk.Toolbar.__init__(self)
self.buf = buf
self.set_style(gtk.TOOLBAR_ICONS)
item = gtk.ToggleToolButton(gtk.STOCK_BOLD)
item.connect("toggled", self.__toggle_style_cb, "bold")
self.insert(item, -1)
item.show()
item = gtk.ToggleToolButton(gtk.STOCK_ITALIC)
item.connect("toggled", self.__toggle_style_cb, "italic")
self.insert(item, -1)
item.show()
def __toggle_style_cb(self, toggle, tag_name):
if toggle.get_active():
self.buf.apply_tag(tag_name)
else:
self.buf.unapply_tag(tag_name)
class RichTextHandler(xml.sax.handler.ContentHandler):
def __init__(self, serializer, buf):
self.buf = buf
self.serializer = serializer
self.tags = []
def startElement(self, name, attributes):
tag = self.serializer.deserialize_element(name)
if tag:
self.tags.append(tag)
def characters(self, data):
start_it = it = self.buf.get_end_iter()
mark = self.buf.create_mark(None, start_it, True)
self.buf.insert(it, data)
start_it = self.buf.get_iter_at_mark(mark)
for tag in self.tags:
self.buf.apply_tag_by_name(tag, start_it, it)
def endElement(self, name):
tag = self.serializer.deserialize_element(name)
if tag:
self.tags.remove(tag)
class RichTextSerializer:
def __init__(self):
self._open_tags = []
def deserialize_element(self, el_name):
if el_name == "bold":
return "bold"
elif el_name == "italic":
return "italic"
else:
return None
def serialize_tag_start(self, tag):
if tag.get_property("name") == "bold":
return "<bold>"
elif tag.get_property("name") == "italic":
return "<italic>"
else:
return "<unknown>"
def serialize_tag_end(self, tag):
if tag.get_property("name") == "bold":
return "</bold>"
elif tag.get_property("name") == "italic":
return "</italic>"
else:
return "</unknown>"
def serialize(self, buf):
xml = "<richtext>"
next_it = buf.get_start_iter()
while not next_it.is_end():
it = next_it.copy()
if not next_it.forward_to_tag_toggle(None):
next_it = buf.get_end_iter()
tags_to_reopen = []
for tag in it.get_toggled_tags(False):
while 1:
open_tag = self._open_tags.pop()
xml += self.serialize_tag_end(tag)
if open_tag == tag:
break
tags_to_reopen.append(open_tag)
for tag in tags_to_reopen + it.get_toggled_tags(True):
self._open_tags.append(tag)
xml += self.serialize_tag_start(tag)
xml += buf.get_text(it, next_it)
if next_it.is_end():
self._open_tags.reverse()
for tag in self._open_tags:
xml += self.serialize_tag_end(tag)
xml += "</richtext>"
return xml
def deserialize(self, xml_string, buf):
parser = xml.sax.make_parser()
handler = RichTextHandler(self, buf)
parser.setContentHandler(handler)
parser.feed(xml_string)
parser.close()
def test_quit(window, rich_buf):
print RichTextSerializer().serialize(rich_buf)
gtk.main_quit()
if __name__ == "__main__":
window = gtk.Window()
window.set_default_size(400, 300)
vbox = gtk.VBox()
rich_buf = RichTextBuffer()
xml_string = "<richtext>"
#xml_string += "<bold><italic>Test</italic>one</bold>\n"
xml_string += "<bold><italic>Test two</italic></bold>"
xml_string += "</richtext>"
RichTextSerializer().deserialize(xml_string, rich_buf)
view = gtk.TextView(rich_buf)
vbox.pack_start(view)
view.show()
toolbar = RichTextToolbar(rich_buf)
vbox.pack_start(toolbar, False)
toolbar.show()
window.add(vbox)
vbox.show()
window.show()
window.connect("destroy", test_quit, rich_buf)
gtk.main()
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