Allow display timeouts to be set in config.xml.

Bug: 13671523
Change-Id: I79fc21999bc62743178d2d22071455a0c11070c9

2 files changed, 46 insertions, 0 deletions

diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index 9d27164..dd13db0 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -1181,6 +1181,49 @@
     -->
     <bool name="config_powerDecoupleInteractiveModeFromDisplay">false</bool>
 
+    <!-- User activity timeout: Minimum screen off timeout in milliseconds.
+
+         Sets a lower bound for the {@link Settings.System#SCREEN_OFF_TIMEOUT} setting
+         which determines how soon the device will go to sleep when there is no
+         user activity.
+
+         This value must be greater than zero, otherwise the device will immediately
+         fall asleep again as soon as it is awoken.
+    -->
+    <integer name="config_minimumScreenOffTimeout">10000</integer>
+
+    <!-- User activity timeout: Maximum screen dim duration in milliseconds.
+
+         Sets an upper bound for how long the screen will dim before the device goes
+         to sleep when there is no user activity.  The dim duration is subtracted from
+         the overall screen off timeout to determine the screen dim timeout.
+         When the screen dim timeout expires, the screen will dim, shortly thereafter
+         the device will go to sleep.
+
+         If the screen off timeout is very short, the dim duration may be reduced
+         proportionally.  See config_maximumScreenDimRatio.
+
+         This value may be zero in which case the screen will not dim before the
+         device goes to sleep.
+    -->
+    <integer name="config_maximumScreenDimDuration">7000</integer>
+
+    <!-- User activity timeout: Maximum screen dim duration as a percentage of screen off timeout.
+
+         This resource is similar to config_maximumScreenDimDuration but the maximum
+         screen dim duration is defined as a ratio of the overall screen off timeout
+         instead of as an absolute value in milliseconds.  This is useful for reducing
+         the dim duration when the screen off timeout is very short.
+
+         When computing the screen dim duration, the power manager uses the lesser
+         of the effective durations expressed by config_maximumScreenDimDuration and
+         config_maximumScreenDimRatio.
+
+         This value must be between 0% and 100%.  If the value is zero, the screen will not
+         dim before the device goes to sleep.
+    -->
+    <fraction name="config_maximumScreenDimRatio">20%</fraction>
+
     <!-- Base "touch slop" value used by ViewConfiguration as a
          movement threshold where scrolling should begin. -->
     <dimen name="config_viewConfigurationTouchSlop">8dp</dimen>
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 72ff32f..29ac8de 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -1633,6 +1633,9 @@
   <java-symbol type="string" name="enable_explore_by_touch_warning_message" />
   <java-symbol type="bool" name="config_powerDecoupleAutoSuspendModeFromDisplay" />
   <java-symbol type="bool" name="config_powerDecoupleInteractiveModeFromDisplay" />
+  <java-symbol type="integer" name="config_minimumScreenOffTimeout" />
+  <java-symbol type="integer" name="config_maximumScreenDimDuration" />
+  <java-symbol type="fraction" name="config_maximumScreenDimRatio" />
   <java-symbol type="string" name="config_customAdbPublicKeyConfirmationComponent" />
 
   <java-symbol type="layout" name="resolver_list" />