pygtk r2982 - in trunk: . examples examples/pygtk-demo/demos
- From: gianmt svn gnome org
- To: svn-commits-list gnome org
- Subject: pygtk r2982 - in trunk: . examples examples/pygtk-demo/demos
- Date: Sun, 18 May 2008 20:54:10 +0000 (UTC)
Author: gianmt
Date: Sun May 18 20:54:09 2008
New Revision: 2982
URL: http://svn.gnome.org/viewvc/pygtk?rev=2982&view=rev
Log:
add new example textscroll.py by Muntyan, fixes #522047
Added:
trunk/examples/pygtk-demo/demos/textscroll.py
Modified:
trunk/ChangeLog
trunk/examples/Makefile.am
Modified: trunk/examples/Makefile.am
==============================================================================
--- trunk/examples/Makefile.am (original)
+++ trunk/examples/Makefile.am Sun May 18 20:54:09 2008
@@ -83,6 +83,7 @@
pygtk-demo/demos/print_editor.py \
pygtk-demo/demos/sizegroup.py \
pygtk-demo/demos/stock_browser.py \
+ pygtk-demo/demos/textscroll.py \
pygtk-demo/demos/textview.py \
pygtk-demo/demos/tree_store.py \
pygtk-demo/demos/treemodel.py \
Added: trunk/examples/pygtk-demo/demos/textscroll.py
==============================================================================
--- (empty file)
+++ trunk/examples/pygtk-demo/demos/textscroll.py Sun May 18 20:54:09 2008
@@ -0,0 +1,133 @@
+#!/usr/bin/env python
+"""Text Widget/Automatic scrolling
+
+This example demonstrates how to use the gravity of
+GtkTextMarks to keep a text view scrolled to the bottom
+while appending text."""
+
+import gobject
+import gtk
+
+class AutomaticScrollingDemo(gtk.Window):
+ def __init__(self, parent=None):
+ # Create the toplevel window
+ 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(600, 400)
+ self.set_border_width(0)
+
+ hbox = gtk.HBox(True, 6)
+ self.add(hbox)
+
+ self.create_text_view(hbox, True)
+ self.create_text_view(hbox, False)
+ self.count_sb = 0
+ self.count_se = 0
+
+ self.show_all()
+
+ def create_text_view(self, hbox, scroll_to_end):
+ swindow = gtk.ScrolledWindow()
+ hbox.pack_start(swindow)
+ textview = gtk.TextView()
+ swindow.add(textview)
+
+ timeout = self.setup_scroll(textview, scroll_to_end)
+
+ # Remove the timeout in destroy handler, so we don't try to
+ # scroll destroyed widget.
+ textview.connect("destroy", lambda widget: gobject.source_remove(timeout))
+
+ def setup_scroll(self, textview, scroll_to_end):
+ buf = textview.get_buffer()
+ itr = buf.get_end_iter()
+
+ if scroll_to_end:
+ # If we want to scroll to the end, including horizontal scrolling,
+ # then we just create a mark with right gravity at the end of the
+ # buffer. It will stay at the end unless explicitely moved with
+ # gtk_text_buffer_move_mark.
+ buf.create_mark("end", itr, False)
+
+ # Add scrolling timeout.
+ return gobject.timeout_add(50, self.scroll_to_end, textview)
+ else:
+ # If we want to scroll to the bottom, but not scroll horizontally,
+ # then an end mark won't do the job. Just create a mark so we can
+ # use it with gtk_text_view_scroll_mark_onscreen, we'll position it
+ # explicitely when needed. Use left gravity so the mark stays where
+ # we put it after inserting new text.
+ buf.create_mark("scroll", itr, True)
+
+ # Add scrolling timeout.
+ return gobject.timeout_add(100, self.scroll_to_bottom, textview)
+
+ """ Scroll to the end of the buffer. """
+ def scroll_to_end(self, textview):
+ buf = textview.get_buffer()
+
+ # Get the "end" mark. It's located at the end of buffer because
+ # of right gravity
+ mark = buf.get_mark("end")
+ itr = buf.get_iter_at_mark(mark)
+
+ # and insert some text at its position, the iter will be
+ # revalidated after insertion to point to the end of inserted text
+ buf.insert(itr, "\n")
+ buf.insert(itr, " " * self.count_se)
+ buf.insert(itr, "Scroll to end scroll to end scroll to end scroll to end ")
+
+ # Now scroll the end mark onscreen.
+ textview.scroll_mark_onscreen(mark)
+
+ # Emulate typewriter behavior, shift to the left if we
+ # are far enough to the right.
+ self.count_se += 1
+ if self.count_se > 150:
+ self.count_se = 0
+
+ return True
+
+ """ Scroll to the bottom of the buffer. """
+ def scroll_to_bottom(self, textview):
+ buf = textview.get_buffer()
+
+ # Get the end iterator
+ itr = buf.get_end_iter()
+
+ # and insert some text at it, the iter will be revalidated
+ # after insertion to point to the end of inserted text
+ buf.insert(itr, "\n")
+ buf.insert(itr, " " * self.count_sb)
+ buf.insert(itr, "Scroll to bottom scroll to bottom scroll to bottom scroll to bottom")
+
+ # Move the iterator to the beginning of line, so we don't scroll
+ # in horizontal direction
+ itr.set_line_offset(0)
+
+ # and place the mark at iter. the mark will stay there after we
+ # insert some text at the end because it has right gravity.
+ mark = buf.get_mark("scroll")
+ buf.move_mark(mark, itr)
+
+ # Scroll the mark onscreen.
+ textview.scroll_mark_onscreen(mark)
+
+ # Shift text back if we got enough to the right.
+ self.count_sb += 1
+ if self.count_sb > 40:
+ self.count_sb = 0
+
+ return True
+
+def main():
+ AutomaticScrollingDemo()
+ gtk.main()
+
+if __name__ == '__main__':
+ main()
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