Merge "Move RegionSamplingHelper to SysUI shared" into sc-v2-dev am: ca7eb3f9

    <!-- The amount by which the arrow is shifted to avoid the finger-->

    <dimen name="navigation_edge_finger_offset">48dp</dimen>

    <!-- Luminance threshold to determine black/white contrast for the navigation affordances -->

    <item name="navigation_luminance_threshold" type="dimen" format="float">0.5</item>

    <!-- Luminance change threshold that allows applying new value if difference was exceeded -->

    <item name="navigation_luminance_change_threshold" type="dimen" format="float">0.05</item>

    <dimen name="floating_rotation_button_diameter">40dp</dimen>

    <dimen name="floating_rotation_button_min_margin">20dp</dimen>

    <dimen name="floating_rotation_button_taskbar_left_margin">20dp</dimen>

 * limitations under the License.

 */

package com.android.systemui.navigationbar.gestural;

package com.android.systemui.shared.navigationbar;

import static android.view.Display.DEFAULT_DISPLAY;

import android.content.res.Resources;

import android.annotation.TargetApi;

import android.graphics.Rect;

import android.os.Build;

import android.os.Handler;

import android.view.CompositionSamplingListener;

import android.view.SurfaceControl;

import android.view.ViewRootImpl;

import android.view.ViewTreeObserver;

import com.android.systemui.R;

import java.io.PrintWriter;

import java.util.concurrent.Executor;

/**

 * A helper class to sample regions on the screen and inspect its luminosity.

 */

@TargetApi(Build.VERSION_CODES.Q)

public class RegionSamplingHelper implements View.OnAttachStateChangeListener,

        View.OnLayoutChangeListener {

    // Luminance threshold to determine black/white contrast for the navigation affordances.

    // Passing the threshold of this luminance value will make the button black otherwise white

    private static final float NAVIGATION_LUMINANCE_THRESHOLD = 0.5f;

    // Luminance change threshold that allows applying new value if difference was exceeded

    private static final float NAVIGATION_LUMINANCE_CHANGE_THRESHOLD = 0.05f;

    private final Handler mHandler = new Handler();

    private final View mSampledView;

    private boolean mWaitingOnDraw;

    private boolean mIsDestroyed;

    // Passing the threshold of this luminance value will make the button black otherwise white

    private final float mLuminanceThreshold;

    private final float mLuminanceChangeThreshold;

    private boolean mFirstSamplingAfterStart;

    private boolean mWindowVisible;

    private boolean mWindowHasBlurs;

        mSampledView.addOnAttachStateChangeListener(this);

        mSampledView.addOnLayoutChangeListener(this);

        final Resources res = sampledView.getResources();

        mLuminanceThreshold = res.getFloat(R.dimen.navigation_luminance_threshold);

        mLuminanceChangeThreshold = res.getFloat(R.dimen.navigation_luminance_change_threshold);

        mCallback = samplingCallback;

    }

        // If the difference between the new luma and the current luma is larger than threshold

        // then apply the current luma, this is to prevent small changes causing colors to flicker

        if (Math.abs(mCurrentMedianLuma - mLastMedianLuma) > mLuminanceChangeThreshold) {

            mCallback.onRegionDarknessChanged(medianLuma < mLuminanceThreshold /* isRegionDark */);

        if (Math.abs(mCurrentMedianLuma - mLastMedianLuma)

                > NAVIGATION_LUMINANCE_CHANGE_THRESHOLD) {

            mCallback.onRegionDarknessChanged(

                    medianLuma < NAVIGATION_LUMINANCE_THRESHOLD /* isRegionDark */);

            mLastMedianLuma = medianLuma;

        }

    }

import com.android.systemui.navigationbar.buttons.RotationContextButton;

import com.android.systemui.navigationbar.gestural.EdgeBackGestureHandler;

import com.android.systemui.navigationbar.gestural.FloatingRotationButton;

import com.android.systemui.navigationbar.gestural.RegionSamplingHelper;

import com.android.systemui.shared.navigationbar.RegionSamplingHelper;

import com.android.systemui.recents.OverviewProxyService;

import com.android.systemui.recents.Recents;

import com.android.systemui.shared.system.ActivityManagerWrapper;

import com.android.systemui.R;

import com.android.systemui.animation.Interpolators;

import com.android.systemui.plugins.NavigationEdgeBackPlugin;

import com.android.systemui.shared.navigationbar.RegionSamplingHelper;

import com.android.systemui.statusbar.VibratorHelper;

import java.io.PrintWriter;