Method start_swipe

plugins/single_plugins/vswipe.cpp:196–215

    };

    void start_swipe(swipe_direction_t direction)
    {
        assert(direction != UNKNOWN);
        state.direction = direction;

        if (!output->activate_plugin(&grab_interface))
        {
            return;
        }

        input_grab->grab_input(wf::scene::layer::OVERLAY);
        wf::get_core().seat->focus_output(output);

        auto ws = output->wset()->get_current_workspace();
        wall->set_background_color(background_color);
        wall->set_gap_size(gap);
        wall->set_viewport(wall->get_workspace_rectangle(ws));
        wall->start_output_renderer();
        output->render->add_effect(&post_frame, wf::OUTPUT_EFFECT_POST);
    }

    // XXX: how to determine this??
    static constexpr double initial_direction_threshold = 0.05;