config: add bar.trackpad-sensitivity

This is an integer that specifies the amount of scrolling that needs
to be accumulated before a wheel-up/down event is emitted.

A higher value means you need to drag your fingers a longer distance
before the event is emitted.

The default is 30.

bar/bar.c

@@ -408,6 +408,7 @@ bar_new(const struct bar_config *config)
     priv->right_spacing = config->right_spacing;
     priv->left_margin = config->left_margin;
     priv->right_margin = config->right_margin;
+    priv->trackpad_sensitivity = config->trackpad_sensitivity;
     priv->border.width = config->border.width;
     priv->border.color = config->border.color;
     priv->border.left_margin = config->border.left_margin;

bar/bar.h

@@ -25,6 +25,7 @@ struct bar_config {
     int height;
     int left_spacing, right_spacing;
     int left_margin, right_margin;
+    int trackpad_sensitivity;
 
     pixman_color_t background;
 

bar/private.h

@@ -10,6 +10,7 @@ struct private {
     int height;
     int left_spacing, right_spacing;
     int left_margin, right_margin;
+    int trackpad_sensitivity;
 
     pixman_color_t background;
 

bar/wayland.c

@@ -307,6 +307,8 @@ wl_pointer_axis(void *data, struct wl_pointer *wl_pointer,
 
     struct seat *seat = data;
     struct wayland_backend *backend = seat->backend;
+    struct private *bar = backend->bar->private;
+
     backend->active_seat = seat;
 
     if (backend->have_discrete)
@@ -325,7 +327,7 @@ wl_pointer_axis(void *data, struct wl_pointer *wl_pointer,
         ? MOUSE_BTN_WHEEL_DOWN
         : MOUSE_BTN_WHEEL_UP;
 
-    const double step = 20.;
+    const double step = bar->trackpad_sensitivity;
     const double adjust = backend->aggregated_scroll > 0 ? -step : step;
 
     while (fabs(backend->aggregated_scroll) >= step) {

config-verify.c

@@ -423,6 +423,8 @@ conf_verify_bar(const struct yml_node *bar)
         {"center", false, &verify_module_list},
         {"right", false, &verify_module_list},
 
+        {"trackpad-sensitivity", false, &conf_verify_int},
+
         {NULL, false, NULL},
     };
 

config.c

@@ -252,6 +252,12 @@ conf_to_bar(const struct yml_node *bar, enum bar_backend backend)
     if (right_margin != NULL)
         conf.right_margin = yml_value_as_int(right_margin);
 
+    const struct yml_node *trackpad_sensitivity =
+        yml_get_value(bar, "trackpad-sensitivity");
+    conf.trackpad_sensitivity = trackpad_sensitivity != NULL
+        ? yml_value_as_int(trackpad_sensitivity)
+        : 30;
+
     const struct yml_node *border = yml_get_value(bar, "border");
     if (border != NULL) {
         const struct yml_node *width = yml_get_value(border, "width");

doc/yambar.5.scd

@@ -109,6 +109,12 @@ types that are frequently used:
 :  color
 :  no
 :  Default foreground (text) color to use
+|  trackpad-sensitivity
+:  int
+:  no
+:  How easy it is to trigger wheel-up and wheel-down on-click
+   handlers. Higher values means you need to drag your finger a longer
+   distance. The default is 30.
 |  left
 :  list
 :  no