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- # ReleaseNotesViewer.py
- #
- # Copyright (c) 2006 Sebastian Heinlein
- #
- # Author: Sebastian Heinlein <sebastian.heinlein@web.de>
- #
- # This modul provides an inheritance of the gtk.TextView that is
- # aware of http URLs and allows to open them in a browser.
- # It is based on the pygtk-demo "hypertext".
- #
- # This program is free software; you can redistribute it and/or
- # modify it under the terms of the GNU General Public License as
- # published by the Free Software Foundation; either version 2 of the
- # License, or (at your option) any later version.
- #
- # This program 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 General Public License for more details.
- #
- # You should have received a copy of the GNU General Public License
- # along with this program; if not, write to the Free Software
- # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- # USA
-
-
- import pygtk
- import gtk
- import pango
- import subprocess
- import os
-
- class ReleaseNotesViewer(gtk.TextView):
- def __init__(self, notes):
- """Init the ReleaseNotesViewer as an Inheritance of the gtk.TextView.
- Load the notes into the buffer and make links clickable"""
- # init the parent
- gtk.TextView.__init__(self)
- # global hovering over link state
- self.hovering = False
- self.first = True
- # setup the buffer and signals
- self.set_property("editable", False)
- self.set_cursor_visible(False)
- self.buffer = gtk.TextBuffer()
- self.set_buffer(self.buffer)
- self.buffer.set_text(notes)
- self.connect("event-after", self.event_after)
- self.connect("motion-notify-event", self.motion_notify_event)
- self.connect("visibility-notify-event", self.visibility_notify_event)
- # search for links in the notes and make them clickable
- self.search_links()
-
- def tag_link(self, start, end, url):
- """Apply the tag that marks links to the specified buffer selection"""
- tag = self.buffer.create_tag(None, foreground="blue",
- underline=pango.UNDERLINE_SINGLE)
- tag.set_data("url", url)
- self.buffer.apply_tag(tag , start, end)
-
- def search_links(self):
- """Search for http URLs in the buffer and call the tag_link method
- for each one to tag them as links"""
- # start at the beginning of the buffer
- iter = self.buffer.get_iter_at_offset(0)
- while 1:
- # search for the next URL in the buffer
- ret = iter.forward_search("http://", gtk.TEXT_SEARCH_VISIBLE_ONLY,
- None)
- # if we reach the end break the loop
- if not ret:
- break
- # get the position of the protocol prefix
- (match_start, match_end) = ret
- match_tmp = match_end.copy()
- while 1:
- # extend the selection to the complete URL
- if match_tmp.forward_char():
- text = match_end.get_text(match_tmp)
- if text in (" ", ")", "]", "\n", "\t"):
- break
- else:
- break
- match_end = match_tmp.copy()
- # call the tagging method for the complete URL
- url = match_start.get_text(match_end)
- self.tag_link(match_start, match_end, url)
- # set the starting point for the next search
- iter = match_end
-
- def event_after(self, text_view, event):
- """callback for mouse click events"""
- # we only react on left mouse clicks
- if event.type != gtk.gdk.BUTTON_RELEASE:
- return False
- if event.button != 1:
- return False
-
- # try to get a selection
- try:
- (start, end) = self.buffer.get_selection_bounds()
- except ValueError:
- pass
- else:
- if start.get_offset() != end.get_offset():
- return False
-
- # get the iter at the mouse position
- (x, y) = self.window_to_buffer_coords(gtk.TEXT_WINDOW_WIDGET,
- int(event.x), int(event.y))
- iter = self.get_iter_at_location(x, y)
-
- # call open_url if an URL is assigned to the iter
- tags = iter.get_tags()
- for tag in tags:
- url = tag.get_data("url")
- if url != "":
- self.open_url(url)
- break
-
- def open_url(self, url):
- """Open the specified URL in a browser"""
- # Find an appropiate browser
- if os.path.exists("/usr/bin/exo-open"):
- command = ["exo-open", url]
- elif os.path.exists('usr/bin/gnome-open'):
- command = ['gnome-open', url]
- else:
- command = ['x-www-browser', url]
-
- # Avoid to run the browser as user root
- if os.getuid() == 0 and os.environ.has_key('SUDO_USER'):
- command = ['sudo', '-u', os.environ['SUDO_USER']] + command
-
- subprocess.Popen(command)
-
- def motion_notify_event(self, text_view, event):
- """callback for the mouse movement event, that calls the
- check_hovering method with the mouse postition coordiantes"""
- x, y = text_view.window_to_buffer_coords(gtk.TEXT_WINDOW_WIDGET,
- int(event.x), int(event.y))
- self.check_hovering(x, y)
- self.window.get_pointer()
- return False
-
- def visibility_notify_event(self, text_view, event):
- """callback if the widgets gets visible (e.g. moves to the foreground)
- that calls the check_hovering method with the mouse position
- coordinates"""
- (wx, wy, mod) = text_view.window.get_pointer()
- (bx, by) = text_view.window_to_buffer_coords(gtk.TEXT_WINDOW_WIDGET, wx,
- wy)
- self.check_hovering(bx, by)
- return False
-
- def check_hovering(self, x, y):
- """Check if the mouse is above a tagged link and if yes show
- a hand cursor"""
- _hovering = False
- # get the iter at the mouse position
- iter = self.get_iter_at_location(x, y)
-
- # set _hovering if the iter has the tag "url"
- tags = iter.get_tags()
- for tag in tags:
- url = tag.get_data("url")
- if url != "":
- _hovering = True
- break
-
- # change the global hovering state
- if _hovering != self.hovering or self.first == True:
- self.first = False
- self.hovering = _hovering
- # Set the appropriate cursur icon
- if self.hovering:
- self.get_window(gtk.TEXT_WINDOW_TEXT).\
- set_cursor(gtk.gdk.Cursor(gtk.gdk.HAND2))
- else:
- self.get_window(gtk.TEXT_WINDOW_TEXT).\
- set_cursor(gtk.gdk.Cursor(gtk.gdk.LEFT_PTR))
-
- if __name__ == "__main__":
- # some simple test code
- win = gtk.Window()
- rv = ReleaseNotesViewer(open("../DistUpgrade/ReleaseAnnouncement").read())
- win.add(rv)
- win.show_all()
- gtk.main()
-