panel: Backlight control widget

.github/workflows/ci.yaml

@@ -9,7 +9,7 @@ jobs:
     steps:
       - run: echo 'http://dl-cdn.alpinelinux.org/alpine/v3.22/community' > /etc/apk/repositories
       - run: echo 'http://dl-cdn.alpinelinux.org/alpine/v3.22/main' >> /etc/apk/repositories
-      - run: apk --no-cache add git g++ binutils pkgconf meson ninja musl-dev gtkmm4-dev vala gobject-introspection gobject-introspection-dev pulseaudio-dev pipewire-dev wireplumber-dev libdbusmenu-glib-dev alsa-lib-dev yyjson-dev linux-pam-dev util-linux-login openssl-dev
+      - run: apk --no-cache add git g++ binutils pkgconf meson ninja musl-dev gtkmm4-dev vala gobject-introspection gobject-introspection-dev ddcutil pulseaudio-dev pipewire-dev wireplumber-dev libdbusmenu-glib-dev alsa-lib-dev yyjson-dev linux-pam-dev util-linux-login openssl-dev
       - run: echo 'http://dl-cdn.alpinelinux.org/alpine/edge/testing' >> /etc/apk/repositories
       - run: echo 'http://dl-cdn.alpinelinux.org/alpine/edge/main' >> /etc/apk/repositories
       - run: apk --no-cache add wayland-protocols wayfire-dev gtk4-layer-shell-dev gtk4-layer-shell

meson.build

@@ -28,6 +28,8 @@ libpulse = dependency('libpulse', required: get_option('volume-widget'))
 libgvc = subproject('gvc', default_options: ['static=true'], required: get_option('volume-widget'))
 pipewire = dependency('libpipewire-0.3', required: get_option('wp-mixer-widget'))
 wireplumber = dependency('wireplumber-0.5', required: get_option('wp-mixer-widget'))
+ddcutil = dependency('libddcutil-5', required: get_option('ddcutil'))
+ddcutil = dependency('ddcutil', required: get_option('ddcutil'))
 dbusmenu_gtk = dependency('dbusmenu-glib-0.4')
 xkbregistry = dependency('xkbregistry')
 json = subproject('wf-json').get_variable('wfjson')
@@ -57,6 +59,10 @@ if wireplumber.found()
 	add_project_arguments('-DHAVE_WIREPLUMBER=1', language: 'cpp')
 endif
 
+if ddcutil.found()
+	add_project_arguments('-DHAVE_DDCUTIL=1', language: 'cpp')
+endif
+
 needs_libinotify = ['freebsd', 'dragonfly'].contains(host_machine.system())
 libinotify = dependency('libinotify', required: needs_libinotify)
 

meson_options.txt

@@ -10,6 +10,12 @@ option(
     value: 'auto',
     description: 'Build wireplumber mixer widget',
 )
+option(
+    'ddcutil',
+    type: 'feature',
+    value: 'auto',
+    description: 'Build external monitor support for backlight widget'
+)
 option(
     'wayland-logout',
     type: 'boolean',

metadata/panel.xml

@@ -395,6 +395,44 @@
 	</option>
 	</group>
 	<group>
+	<group>
+	<_short>Backlight</_short>
+	<option name="light_popup_on_change" type="bool">
+		<_short>Popup on change</_short>
+		<default>true</default>
+	</option>
+	<option name="light_popup_timeout" type="double">
+		<_short>Popup timeout</_short>
+		<default>2.5</default>
+		<min>0</min>
+	</option>
+	<option name="light_slider_length" type="int">
+		<_short>Slider length</_short>
+		<default>300</default>
+		<min>1</min>
+	</option>
+	<option name="light_scroll_sensitivity" type="double">
+		<_short>Scroll sensitivity</_short>
+		<default>1</default>
+	</option>
+	<option name="light_invert_scroll" type="bool">
+		<_short>Invert scroll</_short>
+		<_long>
+			Inverts which scroll direction raises and lowers display brightness
+		</_long>
+		<default>false</default>
+	</option>
+	<option name="light_spacing" type="int">
+		<_short>Spacing between controls</_short>
+		<default>8</default>
+		<min>0</min>
+	</option>
+	<option name="light_icon_size" type="int">
+		<_short>Light icon size</_short>
+		<default>0</default>
+		<min>0</min>
+	</option>
+	</group>
 	<_short>Notifications</_short>
 	<option name="notifications_autohide_timeout" type="double">
 		<_short>Notifications Display Timeout</_short>

src/panel/meson.build

@@ -21,6 +21,8 @@ widget_sources = [
   'widgets/tray/host.cpp',
   'widgets/tray/dbusmenu.cpp',
   'widgets/workspace-switcher.cpp',
+  'widgets/backlight/backlight.cpp',
+  'widgets/backlight/sysfs.cpp',
 ]
 
 deps = [
@@ -35,6 +37,13 @@ deps = [
   json,
 ]
 
+if ddcutil.found()
+  widget_sources += 'widgets/backlight/ddcutil.cpp'
+  deps += ddcutil
+else
+  message('Libddcutil not found, light widget will not support external monitors.')
+endif
+
 if libpulse.found()
   widget_sources += [
     'widgets/volume.cpp',

src/panel/panel.cpp

@@ -33,6 +33,7 @@
 #ifdef HAVE_WIREPLUMBER
     #include "widgets/wp-mixer/wp-mixer.hpp"
 #endif
+#include "widgets/backlight/backlight.hpp"
 #include "widgets/window-list/window-list.hpp"
 #include "widgets/notifications/notification-center.hpp"
 #include "widgets/tray/tray.hpp"
@@ -188,6 +189,15 @@ class WayfirePanel::impl
 #endif
         }
 
+        if (name == "backlight")
+        {
+            return Widget(new WayfireBacklight(output));
+#ifndef HAVE_DDCUTIL
+            std::cout << "Built without DDC/CI support, backlight widget "
+                         " doesn’t support external monitors." << std::endl;
+#endif
+        }
+
         if (name == "window-list")
         {
             return Widget(new WayfireWindowList(output));
@@ -533,7 +543,8 @@ void WayfirePanelApp::on_activate()
         {"panel/wp_icon_size", ".wp-mixer"},
         {"panel/wp_popup_icon_size", ".mute-toggle, .default-button"},
         {"panel/notifications_icon_size", ".notification-center "},
-        {"panel/tray_icon_size", ".tray-button"}
+        {"panel/tray_icon_size", ".tray-button"},
+        {"panel/light_icon_size", ".light"}
     };
     for (auto pair : icon_sizes_args)
     {