schemas: Define schema for a default calculator

Defines a schema that allows users to specify a default calculator application.
Default initialized to 'mate-calc'.

Signed-off-by: Zhang Xianwei <[email protected]>

Author: zhangxianwei8

schemas/Makefile.am

@@ -4,6 +4,7 @@ desktop_gschemas_in = \
 	org.mate.applications-at-mobility.gschema.xml.in \
 	org.mate.applications-at-visual.gschema.xml.in \
 	org.mate.applications-browser.gschema.xml.in \
+	org.mate.applications-calculator.gschema.xml.in \
 	org.mate.applications-office.gschema.xml.in \
 	org.mate.applications-terminal.gschema.xml.in \
 	org.mate.background.gschema.xml.in \

schemas/org.mate.applications-calculator.gschema.xml.in

@@ -0,0 +1,9 @@
+<schemalist gettext-domain="@GETTEXT_PACKAGE@">
+  <schema id="org.mate.applications-calculator" path="/org/mate/desktop/applications/calculator/">
+    <key name="exec" type="s">
+      <default>'mate-calc'</default>
+      <summary>Calculator application</summary>
+      <description>Calculator program to use when starting applications that require one.</description>
+    </key>
+  </schema>
+</schemalist>