Add surface opacity controls.

diff --git a/src/shell.c b/src/shell.c
index 6e9b159..b26cbf4 100644 (file)
--- a/src/shell.c
+++ b/src/shell.c
@@ -1162,6 +1162,41 @@ resize_binding(struct wl_input_device *device, uint32_t time,
 }
 
 static void
+surface_opacity_binding(struct wl_input_device *device, uint32_t time,
+              uint32_t key, uint32_t button, uint32_t axis, int32_t value, void *data)
+{
+       int step = 15;
+       struct shell_surface *shsurf;
+       struct weston_surface *surface =
+               (struct weston_surface *) device->pointer_focus;
+
+       if (surface == NULL)
+               return;
+
+       shsurf = get_shell_surface(surface);
+       if (!shsurf)
+               return;
+
+       switch (shsurf->type) {
+               case SHELL_SURFACE_BACKGROUND:
+               case SHELL_SURFACE_SCREENSAVER:
+                       return;
+               default:
+                       break;
+       }
+
+       surface->alpha += value * step;
+
+       if (surface->alpha > 255)
+               surface->alpha = 255;
+       if (surface->alpha < step)
+               surface->alpha = step;
+
+       surface->geometry.dirty = 1;
+       weston_surface_damage(surface);
+}
+
+static void
 zoom_binding(struct wl_input_device *device, uint32_t time,
               uint32_t key, uint32_t button, uint32_t axis, int32_t value, void *data)
 {
@@ -2071,6 +2106,9 @@ shell_init(struct weston_compositor *ec)
        weston_compositor_add_binding(ec, 0, BTN_LEFT, 0, 0,
                                        click_to_activate_binding, ec);
        weston_compositor_add_binding(ec, 0, 0, WL_INPUT_DEVICE_AXIS_VERTICAL_SCROLL,
+                                       MODIFIER_SUPER | MODIFIER_ALT,
+                                       surface_opacity_binding, NULL);
+       weston_compositor_add_binding(ec, 0, 0, WL_INPUT_DEVICE_AXIS_VERTICAL_SCROLL,
                                        MODIFIER_SUPER, zoom_binding, NULL);
        weston_compositor_add_binding(ec, 0, BTN_LEFT, 0,
                                        MODIFIER_SUPER | MODIFIER_ALT,