/usr/share/pygtk/2.0/demos/hypertext.py is in python-gtk2-doc 2.24.0-4ubuntu1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 | #!/usr/bin/env python
'''Text Widget/Hypertext
Usually, tags modify the appearance of text in the view, e.g. making it
bold or colored or underlined. But tags are not restricted to appearance.
They can also affect the behavior of mouse and key presses, as this demo
shows.'''
# pygtk version: Maik Hertha <maik.hertha@berlin.de>
import pygtk
pygtk.require('2.0')
import gtk
import pango
class HypertextDemo(gtk.Window):
hovering_over_link = False
hand_cursor = gtk.gdk.Cursor(gtk.gdk.HAND2)
regular_cursor = gtk.gdk.Cursor(gtk.gdk.XTERM)
def __init__(self, parent=None):
gtk.Window.__init__(self)
try:
self.set_screen(parent.get_screen())
except AttributeError:
self.connect('destroy', lambda *w: gtk.main_quit())
self.set_title(self.__class__.__name__)
self.set_default_size(450, 450)
self.set_border_width(0)
view = gtk.TextView()
view.set_wrap_mode(gtk.WRAP_WORD)
view.connect("key-press-event", self.key_press_event)
view.connect("event-after", self.event_after)
view.connect("motion-notify-event", self.motion_notify_event)
view.connect("visibility-notify-event", self.visibility_notify_event)
buffer = view.get_buffer()
sw = gtk.ScrolledWindow()
sw.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
self.add(sw)
sw.add(view)
self.show_page(buffer, 1)
self.show_all()
# Links can be activated by pressing Enter.
def key_press_event(self, text_view, event):
if (event.keyval == gtk.keysyms.Return or
event.keyval == gtk.keysyms.KP_Enter):
buffer = text_view.get_buffer()
iter = buffer.get_iter_at_mark(buffer.get_insert())
self.follow_if_link(text_view, iter)
return False
# Links can also be activated by clicking.
def event_after(self, text_view, event):
if event.type != gtk.gdk.BUTTON_RELEASE:
return False
if event.button != 1:
return False
buffer = text_view.get_buffer()
# we shouldn't follow a link if the user has selected something
try:
start, end = buffer.get_selection_bounds()
except ValueError:
# If there is nothing selected, None is return
pass
else:
if start.get_offset() != end.get_offset():
return False
x, y = text_view.window_to_buffer_coords(gtk.TEXT_WINDOW_WIDGET,
int(event.x), int(event.y))
iter = text_view.get_iter_at_location(x, y)
self.follow_if_link(text_view, iter)
return False
# Looks at all tags covering the position (x, y) in the text view,
# and if one of them is a link, change the cursor to the "hands" cursor
# typically used by web browsers.
def set_cursor_if_appropriate(self, text_view, x, y):
hovering = False
buffer = text_view.get_buffer()
iter = text_view.get_iter_at_location(x, y)
tags = iter.get_tags()
for tag in tags:
page = tag.get_data("page")
if page != 0:
hovering = True
break
if hovering != self.hovering_over_link:
self.hovering_over_link = hovering
if self.hovering_over_link:
text_view.get_window(gtk.TEXT_WINDOW_TEXT).set_cursor(self.hand_cursor)
else:
text_view.get_window(gtk.TEXT_WINDOW_TEXT).set_cursor(self.regular_cursor)
# Update the cursor image if the pointer moved.
def motion_notify_event(self, text_view, event):
x, y = text_view.window_to_buffer_coords(gtk.TEXT_WINDOW_WIDGET,
int(event.x), int(event.y))
self.set_cursor_if_appropriate(text_view, x, y)
text_view.window.get_pointer()
return False
# Also update the cursor image if the window becomes visible
# (e.g. when a window covering it got iconified).
def visibility_notify_event(self, text_view, event):
wx, wy, mod = text_view.window.get_pointer()
bx, by = text_view.window_to_buffer_coords(gtk.TEXT_WINDOW_WIDGET, wx, wy)
self.set_cursor_if_appropriate (text_view, bx, by)
return False
def insert_link(self, buffer, iter, text, page):
''' Inserts a piece of text into the buffer, giving it the usual
appearance of a hyperlink in a web browser: blue and underlined.
Additionally, attaches some data on the tag, to make it recognizable
as a link.
'''
tag = buffer.create_tag(None,
foreground="blue", underline=pango.UNDERLINE_SINGLE)
tag.set_data("page", page)
buffer.insert_with_tags(iter, text, tag)
def show_page(self, buffer, page):
''' Fills the buffer with text and interspersed links. In any real
hypertext app, this method would parse a file to identify the links.
'''
buffer.set_text("", 0)
iter = buffer.get_iter_at_offset(0)
if page == 1:
buffer.insert(iter, "Some text to show that simple ")
self.insert_link(buffer, iter, "hypertext", 3)
buffer.insert(iter, " can easily be realized with ")
self.insert_link(buffer, iter, "tags", 2)
buffer.insert(iter, ".")
elif page == 2:
buffer.insert(iter,
"A tag is an attribute that can be applied to some range of text. "
"For example, a tag might be called \"bold\" and make the text inside "
"the tag bold. However, the tag concept is more general than that "
"tags don't have to affect appearance. They can instead affect the "
"behavior of mouse and key presses, \"lock\" a range of text so the "
"user can't edit it, or countless other things.\n", -1)
self.insert_link(buffer, iter, "Go back", 1)
elif page == 3:
tag = buffer.create_tag(None, weight=pango.WEIGHT_BOLD)
buffer.insert_with_tags(iter, "hypertext:\n", tag)
buffer.insert(iter,
"machine-readable text that is not sequential but is organized "
"so that related items of information are connected.\n")
self.insert_link(buffer, iter, "Go back", 1)
def follow_if_link(self, text_view, iter):
''' Looks at all tags covering the position of iter in the text view,
and if one of them is a link, follow it by showing the page identified
by the data attached to it.
'''
tags = iter.get_tags()
for tag in tags:
page = tag.get_data("page")
if page != 0:
self.show_page(text_view.get_buffer(), page)
break
def main():
HypertextDemo()
gtk.main()
if __name__ == '__main__':
main()
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