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    <p>Python3 Gtk3 it is, then:</p> <pre class="lang-py prettyprint-override"><code>from gi.repository import Gtk class SuperSimpleWidget(Gtk.Label): __gtype_name__ = 'SuperSimpleWidget' </code></pre> <p>Here is a non-trivial example that actually does something, namely paints its background and draws a diagonal line through it. I'm inheriting from <code>Gtk.Misc</code> instead of <code>Gtk.Widget</code> to save some boilerplate (see below):</p> <pre class="lang-py prettyprint-override"><code>class SimpleWidget(Gtk.Misc): __gtype_name__ = 'SimpleWidget' def __init__(self, *args, **kwds): super().__init__(*args, **kwds) self.set_size_request(40, 40) def do_draw(self, cr): # paint background bg_color = self.get_style_context().get_background_color(Gtk.StateFlags.NORMAL) cr.set_source_rgba(*list(bg_color)) cr.paint() # draw a diagonal line allocation = self.get_allocation() fg_color = self.get_style_context().get_color(Gtk.StateFlags.NORMAL) cr.set_source_rgba(*list(fg_color)); cr.set_line_width(2) cr.move_to(0, 0) # top left of the widget cr.line_to(allocation.width, allocation.height) cr.stroke() </code></pre> <p>Finally, if you really want to derive from <code>Gtk.Widget</code> then you also have to set up a drawing background. <code>Gtk.Misc</code> does that for you, but <code>Gtk.Widget</code> could be a container that doesn't actually draw anything itself. But inquiring minds want to know, so you <strong>could</strong> do it like so:</p> <pre class="lang-py prettyprint-override"><code>from gi.repository import Gdk class ManualWidget(Gtk.Widget): __gtype_name__ = 'ManualWidget' def __init__(self, *args, **kwds): # same as above def do_draw(self, cr): # same as above def do_realize(self): allocation = self.get_allocation() attr = Gdk.WindowAttr() attr.window_type = Gdk.WindowType.CHILD attr.x = allocation.x attr.y = allocation.y attr.width = allocation.width attr.height = allocation.height attr.visual = self.get_visual() attr.event_mask = self.get_events() | Gdk.EventMask.EXPOSURE_MASK WAT = Gdk.WindowAttributesType mask = WAT.X | WAT.Y | WAT.VISUAL window = Gdk.Window(self.get_parent_window(), attr, mask); self.set_window(window) self.register_window(window) self.set_realized(True) window.set_background_pattern(None) </code></pre> <p><strong>Edit</strong> and to actually use it:</p> <pre class="lang-py prettyprint-override"><code>w = Gtk.Window() w.add(SimpleWidget()) w.show_all() w.present() import signal # enable Ctrl-C since there is no menu to quit signal.signal(signal.SIGINT, signal.SIG_DFL) Gtk.main() </code></pre> <p>Or, more fun, use it directly from the ipython3 REPL:</p> <pre class="lang-py prettyprint-override"><code>from IPython.lib.inputhook import enable_gtk3 enable_gtk3() w = Gtk.Window() w.add(SimpleWidget()) w.show_all() w.present() </code></pre>
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    1. POWrite custom widget with GTK3
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    1. COcool! how to run this with a simple gtk app that renders it?
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