{"id":283,"date":"2008-08-19T13:45:18","date_gmt":"2008-08-19T20:45:18","guid":{"rendered":"http:\/\/www.stevenbrown.ca\/blog\/?p=283"},"modified":"2008-08-19T13:46:49","modified_gmt":"2008-08-19T20:46:49","slug":"python-treeview-toggle","status":"publish","type":"post","link":"https:\/\/www.stevenbrown.ca\/blog\/archives\/283","title":{"rendered":"python treeview toggle"},"content":{"rendered":"

Had this post sitting around. Seems finished. May be helpful to someone. \/me waves Wand of Publish +1<\/em><\/p>\n

I was confused when I was playing around with this basic concept: adding a toggle widget to the treeview in pygtk<\/em>. The reason for this is an inconsistency in the api model – or at least how I perceived it. With a regular toggle button, you create the widget and can manipulate it once it is drawn. The checkmark is toggled and the “toggled” signal is emitted. I only connect a signal handler to the toggled<\/em> signal after. However, following this same logic, I created a list with a column of toggle widgets and tried clicking them… but nothing happened. The problem here was the toggled value was linked to the list’s data, and the data wasn’t actually changing. Even though the toggle signal was being emitted, the checkmark wasn’t being toggled because the data wasn’t changing, so I thought there was a problem with my code and the signal wasn’t being emitted. But actually, it would make more sense if it was a “clicked” signal that was being emitted, not the “toggled” signal.<\/p>\n

Example source code:<\/p>\n

\r\n#!\/usr\/bin\/env python\r\n\r\n# example basictreeviewtoggle.py\r\n\r\nimport pygtk\r\npygtk.require('2.0')\r\nimport gtk\r\nimport gobject\r\n\r\nclass BasicTreeViewToggleExample:\r\n\r\n    # close the window and quit\r\n    def delete_event(self, widget, event, data=None):\r\n        gtk.main_quit()\r\n        return False\r\n\r\n    def column_toggled(self, cell, path, model):\r\n        # get toggled iter, and value at column 0\r\n        iter = model.get_iter((int(path),))\r\n        val = model.get_value(iter, 0)\r\n\r\n        # toggle the value\r\n        val = not val\r\n\r\n        # set new value\r\n        model.set(iter, 0, val)\r\n\r\n\r\n    def __init__(self):\r\n        # create a new window\r\n        self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)\r\n        self.window.set_title(\"Basic TreeView Toggle Example\")\r\n        self.window.set_size_request(200, 200)\r\n        self.window.connect(\"delete_event\", self.delete_event)\r\n\r\n        # create a ListStore with two columns to use as the model\r\n        self.model = gtk.ListStore(gobject.TYPE_BOOLEAN, str)\r\n\r\n        # create some list items\r\n        for item in range(5):\r\n            self.model.append([False, 'item %i' % item])\r\n\r\n        # create the TreeView using the model\r\n        self.view = gtk.TreeView(self.model)\r\n\r\n        # create a CellRendererText to render the data\r\n        self.cellrenderer_text = gtk.CellRendererText()\r\n        self.cellrenderer_toggle = gtk.CellRendererToggle()\r\n        self.cellrenderer_toggle.connect('toggled', self.column_toggled, self.model)\r\n\r\n        # create the TreeViewColumns to display the data\r\n        self.tvcolumntext = gtk.TreeViewColumn('TreeViewColumn 1')\r\n        self.tvcolumntoggle = gtk.TreeViewColumn('tog', self.cellrenderer_toggle, active=0)\r\n\r\n        # add the TreeViewColumns to the TreeView\r\n        self.view.append_column(self.tvcolumntoggle)\r\n        self.view.append_column(self.tvcolumntext)\r\n\r\n\r\n\r\n\r\n        # add the cell to the tvcolumn and allow it to expand\r\n        self.tvcolumntoggle.pack_start(self.cellrenderer_toggle, False)\r\n        self.tvcolumntext.pack_start(self.cellrenderer_text, True)\r\n\r\n        \r\n        # set the cell \"text\" attribute to column 0 - retrieve text\r\n        # from that column in treestore\r\n        self.tvcolumntext.add_attribute(self.cellrenderer_text, 'text', 1)\r\n\r\n\r\n        \r\n        # make it searchable\r\n        self.view.set_search_column(1)\r\n\r\n        # Allow sorting on the column\r\n        self.tvcolumntext.set_sort_column_id(1)\r\n\r\n        # Allow drag and drop reordering of rows\r\n        self.view.set_reorderable(True)\r\n\r\n        self.sw = gtk.ScrolledWindow()\r\n        self.sw.add(self.view)\r\n        self.window.add(self.sw)\r\n\r\n        self.window.show_all()\r\n\r\ndef main():\r\n    gtk.main()\r\n\r\nif __name__ == \"__main__\":\r\n    tvexample = BasicTreeViewToggleExample()\r\n    main()\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
Had this post sitting around. Seems finished. May be helpful to someone. \/me waves Wand of Publish +1 I was confused when I was playing around with this basic concept: adding a toggle widget to the treeview in pygtk. The reason for this is an inconsistency in the api model – or at least how… Continue reading python treeview toggle<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3,11],"tags":[48,50,42,175,46,31],"class_list":["post-283","post","type-post","status-publish","format-standard","hentry","category-geek","category-projects","tag-code","tag-gtk","tag-how-to","tag-pygtk","tag-python","tag-ui","entry"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4jEMb-4z","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.stevenbrown.ca\/blog\/wp-json\/wp\/v2\/posts\/283","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.stevenbrown.ca\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.stevenbrown.ca\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.stevenbrown.ca\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.stevenbrown.ca\/blog\/wp-json\/wp\/v2\/comments?post=283"}],"version-history":[{"count":0,"href":"https:\/\/www.stevenbrown.ca\/blog\/wp-json\/wp\/v2\/posts\/283\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.stevenbrown.ca\/blog\/wp-json\/wp\/v2\/media?parent=283"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.stevenbrown.ca\/blog\/wp-json\/wp\/v2\/categories?post=283"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.stevenbrown.ca\/blog\/wp-json\/wp\/v2\/tags?post=283"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}