Commonly Forgotten

Articles by Yuval Langer

1. Handling Python/GTK's GtkScale value-changed event.

   It took me way too long, but now I know how to handle the value-changed event of GtkScale.

   In Glade:

   1. Create a GtkScale widget. We will ID it foo_scale.
   2. In the Signals -> GtkRange -> value-changed line change the Handler field to something sensible like on_foo_scale_value_changed. That will be the name of …

2. Finding mouse location in Python + GTK + OpenCV.

   Expanding on the tutorial:

   https://nofurtherquestions.wordpress.com/2017/03/03/python-3-5-gtk-3-glade-and-opencv/

   it originally had shown the following structure:

   - window1 (GtkWindow)
       - box1 (GtkBox)
           - grayscaleButton (GtkToggleButton)
           - image (GtkImage)
   

   According to https://stackoverflow.com/a/24388310/189995 GtkImage does not generate events, so if you want to find the mouse location, put …

3. Making Quicksilver and friends play nice with wasm32.

   Disclaimer:

   This technology is indistinguishable from magic. I am merely recalling which spells and incantations worked for me. If you have anything to add, you can reach me on https://gitgud.io/yuvallanger/kaka.farm/ or https://gitlab.com/yuvallanger/kaka.farm/.

   Several months ago, writing a Flappy Bird clone …