added int edit

svn: r5747

ChangeLog

@@ -1,3 +1,6 @@
+2006-01-13 Richard Taylor <rjt-gramps@thegrindstone.me.uk>
+    * src/ObjectSelector/_IntEdit.py: added int only edit
+
 2006-01-13  Martin Hawlisch  <Martin.Hawlisch@gmx.de>
 	* src/PedView.py: Use the same font as used in the gtk style
 

src/ObjectSelector/_IntEdit.py

@@ -0,0 +1,49 @@
+import gtk
+import gobject
+
+class IntEdit(gtk.Entry):
+    """An gtk.Edit widget that only allows integers."""
+    
+    __gproperties__ = {}
+
+    __gsignals__ = {
+        }
+
+    def __init__(self):
+	gtk.Entry.__init__(self)
+
+        self._signal = self.connect("insert_text", self.insert_cb)
+
+    def insert_cb(self, widget, text, length, *args):        
+        # if you don't do this, garbage comes in with text
+        text = text[:length]
+        pos = widget.get_position()
+        # stop default emission
+        widget.emit_stop_by_name("insert_text")
+        gobject.idle_add(self.insert, widget, text, pos)
+
+    def insert(self, widget, text, pos):
+        if len(text) > 0 and text.isdigit():            
+            # the next three lines set up the text. this is done because we
+            # can't use insert_text(): it always inserts at position zero.
+            orig_text = widget.get_text()            
+            new_text = orig_text[:pos] + text + orig_text[pos:]
+            # avoid recursive calls triggered by set_text
+            widget.handler_block(self._signal)
+            # replace the text with some new text
+            widget.set_text(new_text)
+            widget.handler_unblock(self._signal)
+            # set the correct position in the widget
+            widget.set_position(pos + len(text))
+    
+if gtk.pygtk_version < (2,8,0):
+    gobject.type_register(IntEdit)
+
+if __name__ == "__main__":
+
+    w = gtk.Window()
+    f = IntEdit()
+    w.add(f)
+    w.show_all()
+
+    gtk.main()