Statusbar slide brightness control

This allows the ability to control brightness by sliding across the statusbar.

Patchset 2   : Cleanup as per suggestions.
               Removed duplicate key from Settings, after settings merge
               Reduce mLinger threshold (Need feedback on whether its too sensitive for some)
Patchset 3,4 : Minor cleanup
Patchset 5   : Cleanup as per comments
Patchset 6   : Remove unused import
               Avoid unecessary gc of unchanging variables (make them instance variables)
Patchset 7   : Cleanup

Change-Id: I19ee7de07be7bfeabde3fb2ae3c60ebdbb4afd72

1 files changed, 43 insertions, 3 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
index d46ea93..0175f13 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
@@ -38,6 +38,7 @@ import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.os.Build;
 import android.os.IBinder;
+import android.os.IPowerManager;
 import android.os.RemoteException;
 import android.os.Handler;
 import android.os.Message;
@@ -134,6 +135,8 @@ public class PhoneStatusBar extends StatusBar {
 
     private float mExpandAccelPx; // classic value: 2000px/s/s
     private float mCollapseAccelPx; // classic value: 2000px/s/s (will be negated to collapse "up")
+    private float mScreenWidth;
+    private int mMinBrightness;
 
     PhoneStatusBarPolicy mIconPolicy;
 
@@ -226,6 +229,7 @@ public class PhoneStatusBar extends StatusBar {
     boolean mAnimatingReveal = false;
     int mViewDelta;
     int[] mAbsPos = new int[2];
+    int mLinger = 0;
     Runnable mPostCollapseCleanup = null;
 
 
@@ -286,7 +290,9 @@ public class PhoneStatusBar extends StatusBar {
         loadDimens();
 
         mIconSize = res.getDimensionPixelSize(com.android.internal.R.dimen.status_bar_icon_size);
-
+        mScreenWidth = (float) context.getResources().getDisplayMetrics().widthPixels;
+        mMinBrightness = context.getResources().getInteger(
+                com.android.internal.R.integer.config_screenBrightnessDim);
         ExpandedView expanded = (ExpandedView)View.inflate(context,
                 R.layout.status_bar_expanded, null);
         if (DEBUG) {
@@ -1499,6 +1505,7 @@ public class PhoneStatusBar extends StatusBar {
         final int hitSize = statusBarSize*2;
         final int y = (int)event.getRawY();
         if (action == MotionEvent.ACTION_DOWN) {
+            mLinger = 0;
             if (!mExpanded) {
                 mViewDelta = statusBarSize - y;
             } else {
@@ -1523,8 +1530,41 @@ public class PhoneStatusBar extends StatusBar {
             final int minY = statusBarSize + mCloseView.getHeight();
             if (action == MotionEvent.ACTION_MOVE) {
                 if (mAnimatingReveal && y < minY) {
-                    // nothing
-                } else  {
+                        boolean brightnessControl = Settings.System.getInt(mStatusBarView.getContext().getContentResolver(),
+                                Settings.System.STATUS_BAR_BRIGHTNESS_TOGGLE, 0) == 1;
+                        if (brightnessControl){
+                            mVelocityTracker.computeCurrentVelocity(1000);
+                            float yVel = mVelocityTracker.getYVelocity();
+                            yVel = Math.abs(yVel);
+                            if (yVel < 50.0f) {
+                                if (mLinger > 20) {
+                                    Context context = mStatusBarView.getContext();
+                                    boolean autoBrightness = Settings.System.getInt(context.getContentResolver(),
+                                                Settings.System.SCREEN_BRIGHTNESS_MODE, 0) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
+                                    if (!autoBrightness) {
+                                        float x = (float) event.getRawX();
+                                        int newBrightness = (int) Math.round(((x/mScreenWidth) * android.os.Power.BRIGHTNESS_ON));
+                                        newBrightness = Math.min(newBrightness, android.os.Power.BRIGHTNESS_ON);
+                                        newBrightness = Math.max(newBrightness, mMinBrightness);
+                                        try {
+                                            IPowerManager power = IPowerManager.Stub.asInterface(ServiceManager.getService("power"));
+                                            if (power != null) {
+                                                power.setBacklightBrightness(newBrightness);
+                                                Settings.System.putInt(context.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS,
+                                                        newBrightness);
+                                            }
+                                        } catch (RemoteException e) {
+                                            Slog.w(TAG, "Setting Brightness failed: " + e);
+                                        }
+                                    }
+                                } else {
+                                    mLinger++;
+                                }
+                            } else {
+                                mLinger = 0;
+                            }
+                        }
+                } else {
                     mAnimatingReveal = false;
                     updateExpandedViewPos(y + mViewDelta);
                 }