Settings: Update button backlight brightness in real time

When adjusting the button backlight brightness using the seekbar,
the brightness did not update in real time, but only when the
RESET button is tapped.

With this change, the brightness is updated instantly.

Change-Id: Ib4db8b4759f2b756495dc3f9319b35cdb548d9e5

1 files changed, 10 insertions, 14 deletions

diff --git a/src/com/android/settings/cyanogenmod/ButtonBacklightBrightness.java b/src/com/android/settings/cyanogenmod/ButtonBacklightBrightness.java
index 7c63f347b..96f60207f 100644
--- a/src/com/android/settings/cyanogenmod/ButtonBacklightBrightness.java
+++ b/src/com/android/settings/cyanogenmod/ButtonBacklightBrightness.java
@@ -49,8 +49,6 @@ public class ButtonBacklightBrightness extends DialogPreference implements
 
     public static final String KEY_BUTTON_BACKLIGHT = "pre_navbar_button_backlight";
 
-    private Window mWindow;
-
     private BrightnessControl mButtonBrightness;
     private BrightnessControl mKeyboardBrightness;
     private BrightnessControl mActiveControl;
@@ -150,10 +148,6 @@ public class ButtonBacklightBrightness extends DialogPreference implements
                 }
             }
         });
-
-        if (getDialog() != null) {
-            mWindow = getDialog().getWindow();
-        }
         updateBrightnessPreview();
     }
 
@@ -280,15 +274,17 @@ public class ButtonBacklightBrightness extends DialogPreference implements
     }
 
     private void updateBrightnessPreview() {
-        if (mWindow != null) {
-            LayoutParams params = mWindow.getAttributes();
-            if (mActiveControl != null) {
-                params.buttonBrightness = (float) mActiveControl.getBrightness(false) / 255.0f;
-            } else {
-                params.buttonBrightness = -1;
-            }
-            mWindow.setAttributes(params);
+        if (getDialog() == null || getDialog().getWindow() == null) {
+            return;
+        }
+        Window window = getDialog().getWindow();
+        LayoutParams params = window.getAttributes();
+        if (mActiveControl != null) {
+            params.buttonBrightness = (float) mActiveControl.getBrightness(false) / 255.0f;
+        } else {
+            params.buttonBrightness = -1;
         }
+        window.setAttributes(params);
     }
 
     private void updateTimeoutEnabledState() {