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sugar-toolkit-gtk3/sugar/chat/richtext.py

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Python
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# Copyright (C) 2006, Red Hat, Inc.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
import gobject
import gtk
import pango
import xml.sax
class RichTextView(gtk.TextView):
__gsignals__ = {
'link-clicked': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_STRING]))
}
def __init__(self):
gtk.TextView.__init__(self, RichTextBuffer())
self.connect("motion-notify-event", self.__motion_notify_cb)
self.connect("button-press-event", self.__button_press_cb)
self.__hover_link = False
def _set_hover_link(self, hover_link):
if hover_link != self.__hover_link:
self.__hover_link = hover_link
display = self.get_toplevel().get_display()
child_window = self.get_window(gtk.TEXT_WINDOW_TEXT)
if hover_link:
cursor = gtk.gdk.Cursor(display, gtk.gdk.HAND2)
else:
cursor = gtk.gdk.Cursor(display, gtk.gdk.XTERM)
child_window.set_cursor(cursor)
gtk.gdk.flush()
def __iter_is_link(self, it):
item = self.get_buffer().get_tag_table().lookup("link")
if item:
return it.has_tag(item)
return False
def __get_event_iter(self, event):
return self.get_iter_at_location(int(event.x), int(event.y))
def __motion_notify_cb(self, widget, event):
if event.is_hint:
event.window.get_pointer();
it = self.__get_event_iter(event)
if it:
hover_link = self.__iter_is_link(it)
else:
hover_link = False
self._set_hover_link(hover_link)
def __button_press_cb(self, widget, event):
it = self.__get_event_iter(event)
if it and self.__iter_is_link(it):
buf = self.get_buffer()
address_tag = buf.get_tag_table().lookup("object-id")
address_end = it.copy()
address_end.backward_to_tag_toggle(address_tag)
address_start = address_end.copy()
address_start.backward_to_tag_toggle(address_tag)
address = buf.get_text(address_start, address_end)
self.emit("link-clicked", address)
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 append_link(self, title, address):
it = self.get_iter_at_mark(self.get_insert())
self.insert_with_tags_by_name(it, address, "link", "object-id")
self.insert_with_tags_by_name(it, title, "link")
def append_icon(self, name, it = None):
if not it:
it = self.get_iter_at_mark(self.get_insert())
self.insert_with_tags_by_name(it, name, "icon", "object-id")
icon_theme = gtk.icon_theme_get_default()
try:
pixbuf = icon_theme.load_icon(name, 16, 0)
self.insert_pixbuf(it, pixbuf)
except gobject.GError:
pass
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)
bounds = self.get_selection_bounds()
if bounds:
[start, end] = bounds
self.remove_tag_by_name(tag_name, start, end)
def __create_tags(self):
tag = self.create_tag("icon")
tag = self.create_tag("link")
tag.set_property("underline", pango.UNDERLINE_SINGLE)
tag.set_property("foreground", "#0000FF")
tag = self.create_tag("object-id")
tag.set_property("invisible", True)
tag = self.create_tag("bold")
tag.set_property("weight", pango.WEIGHT_BOLD)
tag = self.create_tag("italic")
tag.set_property("style", pango.STYLE_ITALIC)
tag = self.create_tag("font-size-xx-small")
tag.set_property("scale", pango.SCALE_XX_SMALL)
tag = self.create_tag("font-size-x-small")
tag.set_property("scale", pango.SCALE_X_SMALL)
tag = self.create_tag("font-size-small")
tag.set_property("scale", pango.SCALE_SMALL)
tag = self.create_tag("font-size-large")
tag.set_property("scale", pango.SCALE_LARGE)
tag = self.create_tag("font-size-x-large")
tag.set_property("scale", pango.SCALE_X_LARGE)
tag = self.create_tag("font-size-xx-large")
tag.set_property("scale", pango.SCALE_XX_LARGE)
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 RichTextToolbox(gtk.HBox):
def __init__(self, buf):
gtk.HBox.__init__(self, False, 6)
self.buf = buf
self._font_size = "normal"
self._font_scales = [ "xx-small", "x-small", "small", \
"normal", \
"large", "x-large", "xx-large" ]
image = gtk.Image()
image.set_from_stock(gtk.STOCK_BOLD, gtk.ICON_SIZE_SMALL_TOOLBAR)
item = gtk.ToggleButton()
item.set_image(image)
item.connect("toggled", self.__toggle_style_cb, "bold")
item.unset_flags(gtk.CAN_FOCUS)
self.pack_start(item, False)
item.show()
image.show()
image = gtk.Image()
image.set_from_stock(gtk.STOCK_ITALIC, gtk.ICON_SIZE_SMALL_TOOLBAR)
item = gtk.ToggleButton()
item.set_image(image)
item.unset_flags(gtk.CAN_FOCUS)
item.connect("toggled", self.__toggle_style_cb, "italic")
self.pack_start(item, False)
item.show()
image = gtk.Image()
image.set_from_stock(gtk.STOCK_GO_UP, gtk.ICON_SIZE_SMALL_TOOLBAR)
self._font_size_up = gtk.Button()
self._font_size_up.set_image(image)
self._font_size_up.unset_flags(gtk.CAN_FOCUS)
self._font_size_up.connect("clicked", self.__font_size_up_cb)
self.pack_start(self._font_size_up, False)
self._font_size_up.show()
image.show()
image = gtk.Image()
image.set_from_stock(gtk.STOCK_GO_DOWN, gtk.ICON_SIZE_SMALL_TOOLBAR)
self._font_size_down = gtk.Button()
self._font_size_down.set_image(image)
self._font_size_down.unset_flags(gtk.CAN_FOCUS)
self._font_size_down.connect("clicked", self.__font_size_down_cb)
self.pack_start(self._font_size_down, False)
self._font_size_down.show()
image.show()
def _get_font_size_index(self):
return self._font_scales.index(self._font_size);
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)
def _set_font_size(self, font_size):
if self._font_size != "normal":
self.buf.unapply_tag("font-size-" + self._font_size)
if font_size != "normal":
self.buf.apply_tag("font-size-" + font_size)
self._font_size = font_size
can_up = self._get_font_size_index() < len(self._font_scales) - 1
can_down = self._get_font_size_index() > 0
self._font_size_up.set_sensitive(can_up)
self._font_size_down.set_sensitive(can_down)
def __font_size_up_cb(self, button):
index = self._get_font_size_index()
if index + 1 < len(self._font_scales):
self._set_font_size(self._font_scales[index + 1])
def __font_size_down_cb(self, button):
index = self._get_font_size_index()
if index > 0:
self._set_font_size(self._font_scales[index - 1])
class RichTextHandler(xml.sax.handler.ContentHandler):
def __init__(self, serializer, buf):
xml.sax.handler.ContentHandler.__init__(self)
self.buf = buf
self.serializer = serializer
self.tags = []
self._in_richtext = False
self._done = False
def startElement(self, name, attrs):
# Look for, and only start parsing after 'richtext'
if not self._in_richtext and name == "richtext":
self._in_richtext = True
if not self._in_richtext:
return
if name != "richtext":
tag = self.serializer.deserialize_element(name, attrs)
self.tags.append(tag)
if name == "link":
self.href = attrs['href']
elif name == "icon":
self.buf.append_icon(attrs['name'], self.buf.get_end_iter())
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)
if tag == "link":
self.buf.insert_with_tags_by_name(start_it, self.href,
"link", "object-id")
def endElement(self, name):
if not self._done and self._in_richtext:
if name != "richtext":
self.tags.pop()
if name == "richtext":
self._done = True
self._in_richtext = False
class RichTextSerializer:
def __init__(self):
self._open_tags = []
def deserialize_element(self, el_name, attributes):
if el_name == "bold":
return "bold"
elif el_name == "italic":
return "italic"
elif el_name == "font":
return "font-size-" + attributes["size"]
elif el_name == "link":
return "link"
elif el_name == "icon":
return "icon"
else:
return None
def _parse_object_id(self, it):
object_id_tag = self.buf.get_tag_table().lookup("object-id")
end = it.copy()
end.forward_to_tag_toggle(object_id_tag)
return self.buf.get_text(it, end)
def serialize_tag_start(self, tag, it):
name = tag.get_property("name")
if name == "bold":
return "<bold>"
elif name == "italic":
return "<italic>"
elif name == "link":
address = self._parse_object_id(it)
return "<link " + "href=\"" + address + "\">"
elif name == "icon":
name = self._parse_object_id(it)
return "<icon " + "name=\"" + name + "\"/>"
elif name == "object-id":
return ""
elif name.startswith("font-size-"):
tag_name = name.replace("font-size-", "", 1)
return "<font size=\"" + tag_name + "\">"
else:
return "<unknown>"
def serialize_tag_end(self, tag):
name = tag.get_property("name")
if name == "bold":
return "</bold>"
elif name == "italic":
return "</italic>"
elif name == "link":
return "</link>"
elif name == "icon":
return ""
elif name == "object-id":
return ""
elif name.startswith("font-size-"):
return "</font>"
else:
return "</unknown>"
def serialize(self, buf):
self.buf = buf
res = "<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()
res += self.serialize_tag_end(tag)
if open_tag == tag:
break
tags_to_reopen.append(open_tag)
for tag in tags_to_reopen:
self._open_tags.append(tag)
res += self.serialize_tag_start(tag, it)
for tag in it.get_toggled_tags(True):
self._open_tags.append(tag)
res += self.serialize_tag_start(tag, it)
res += buf.get_text(it, next_it, False)
if next_it.is_end():
self._open_tags.reverse()
for tag in self._open_tags:
res += self.serialize_tag_end(tag)
res += "</richtext>"
return res
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(w, rb):
print RichTextSerializer().serialize(rb)
gtk.main_quit()
def link_clicked(v, address):
print "Link clicked " + address
if __name__ == "__main__":
window = gtk.Window()
window.set_default_size(400, 300)
vbox = gtk.VBox()
view = RichTextView()
view.connect("link-clicked", link_clicked)
vbox.pack_start(view)
view.show()
rich_buf = view.get_buffer()
test_xml = "<richtext>"
test_xml += "<bold><italic>Test</italic>one</bold>\n"
test_xml += "<bold><italic>Test two</italic></bold>"
test_xml += "<font size=\"xx-small\">Test three</font>"
test_xml += "<link href=\"http://www.gnome.org\">Test link</link>"
test_xml += "<icon name=\"stock_help-chat\"/>"
test_xml += "</richtext>"
RichTextSerializer().deserialize(test_xml, rich_buf)
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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