ui: Add PadOsd

This is an implementation of the pad OSD that's been previously
present in gnome-settings-daemon. Since things are moving closer
to the compositor, it makes sense to have this implemented as shell
UI.

https://bugzilla.gnome.org/show_bug.cgi?id=771067

data/Makefile.am

@@ -38,6 +38,7 @@ endif
 
 introspectiondir = $(datadir)/dbus-1/interfaces
 introspection_DATA =				\
+	org.gnome.Shell.PadOsd.xml		\
 	org.gnome.Shell.Screencast.xml		\
 	org.gnome.Shell.Screenshot.xml		\
 	org.gnome.ShellSearchProvider.xml	\
@@ -115,6 +116,7 @@ EXTRA_DIST =						\
 	$(convert_DATA)					\
 	$(keys_DATA)					\
 	$(dist_theme_files)				\
+	pad-osd.css					\
 	perf-background.xml.in				\
 	org.gnome.Shell.PortalHelper.desktop.in.in	\
 	org.gnome.Shell.PortalHelper.service.in		\

data/gnome-shell-theme.gresource.xml

@@ -22,6 +22,7 @@
     <file>no-events.svg</file>
     <file>no-notifications.svg</file>
     <file>noise-texture.png</file>
+    <file>pad-osd.css</file>
     <file>page-indicator-active.svg</file>
     <file>page-indicator-inactive.svg</file>
     <file>page-indicator-checked.svg</file>

data/org.gnome.Shell.PadOsd.xml

@@ -0,0 +1,28 @@
+<!DOCTYPE node PUBLIC
+'-//freedesktop//DTD D-BUS Object Introspection 1.0//EN'
+'http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd'>
+<node>
+
+  <!--
+      org.gnome.Shell.PadOSD:
+      @short_description: Pad OSD interface
+
+      The interface used to show button map OSD on pad devices.
+  -->
+  <interface name='org.gnome.Shell.Wacom.PadOsd'>
+
+    <!--
+        Show:
+        @device_node: device node file, usually in /dev/input/...
+        @edition_mode: whether toggling edition mode on when showing
+
+        Shows the pad button map OSD for the requested device, the OSD
+	will be shown according the current device settings (output
+	mapping, left handed mode, ...)
+    -->
+    <method name='Show'>
+      <arg name='device_node' direction='in' type='o'/>
+      <arg name='edition_mode' direction='in' type='b'/>
+    </method>
+  </interface>
+</node>

data/theme/gnome-shell.css

@@ -562,6 +562,16 @@ StScrollBar {
     background-color: #eeeeec;
     border-radius: 0.3em; }
 
+/* Pad OSD */
+.pad-osd-window {
+    padding: 32px;
+    background-color: rgba(0, 0, 0, 0.8);
+}
+
+.combo-box-label {
+    width: 15em;
+}
+
 /* App Switcher */
 .switcher-popup {
   padding: 8px;

data/theme/pad-osd.css

@@ -0,0 +1,30 @@
+.Leader {
+    stroke-width: .5 !important;
+    stroke: #535353;
+    fill: none !important;
+}
+
+.Button {
+    stroke-width: .25;
+    stroke: #ededed;
+    fill: #ededed;
+}
+
+.Ring {
+    stroke-width: .5 !important;
+    stroke: #535353 !important;
+    fill: none !important;
+}
+
+.Label {
+    stroke: none !important;
+    stroke-width: .1 !important;
+    font-size: .1 !important;
+    fill: transparent !important;
+}
+
+.TouchStrip, .TouchRing {
+    stroke-width: .1 !important;
+    stroke: #ededed !important;
+    fill: #535353 !important;
+}