packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarInflaterView.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2016 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
  * except in compliance with the License. You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software distributed under the
  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  * KIND, either express or implied. See the License for the specific language governing
  * permissions and limitations under the License.
  */

 package com.android.systemui.statusbar.phone;

 import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;

 import android.annotation.Nullable;
 import android.content.Context;
 import android.content.res.Configuration;
 import android.graphics.drawable.Icon;
 import android.util.AttributeSet;
 import android.util.Log;
 import android.util.SparseArray;
 import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 import android.widget.LinearLayout;
 import android.widget.Space;

 import com.android.internal.annotations.VisibleForTesting;
 import com.android.systemui.Dependency;
 import com.android.systemui.R;
 import com.android.systemui.plugins.PluginListener;
 import com.android.systemui.plugins.statusbar.phone.NavBarButtonProvider;
 import com.android.systemui.recents.OverviewProxyService;
 import com.android.systemui.shared.plugins.PluginManager;
 import com.android.systemui.shared.system.QuickStepContract;
 import com.android.systemui.statusbar.phone.ReverseLinearLayout.ReverseRelativeLayout;
 import com.android.systemui.statusbar.policy.KeyButtonView;
 import com.android.systemui.tuner.TunerService;
 import com.android.systemui.tuner.TunerService.Tunable;

 import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;

 public class NavigationBarInflaterView extends FrameLayout
         implements Tunable, PluginListener<NavBarButtonProvider> {

     private static final String TAG = "NavBarInflater";

     public static final String NAV_BAR_VIEWS = "sysui_nav_bar";
     public static final String NAV_BAR_LEFT = "sysui_nav_bar_left";
     public static final String NAV_BAR_RIGHT = "sysui_nav_bar_right";

     public static final String MENU_IME_ROTATE = "menu_ime";
     public static final String BACK = "back";
     public static final String HOME = "home";
     public static final String RECENT = "recent";
     public static final String NAVSPACE = "space";
     public static final String CLIPBOARD = "clipboard";
     public static final String HOME_HANDLE = "home_handle";
     public static final String KEY = "key";
     public static final String LEFT = "left";
     public static final String RIGHT = "right";
     public static final String CONTEXTUAL = "contextual";

     public static final String GRAVITY_SEPARATOR = ";";
     public static final String BUTTON_SEPARATOR = ",";

     public static final String SIZE_MOD_START = "[";
     public static final String SIZE_MOD_END = "]";

     public static final String KEY_CODE_START = "(";
     public static final String KEY_IMAGE_DELIM = ":";
     public static final String KEY_CODE_END = ")";
     private static final String WEIGHT_SUFFIX = "W";
     private static final String WEIGHT_CENTERED_SUFFIX = "WC";

     private final List<NavBarButtonProvider> mPlugins = new ArrayList<>();

     protected LayoutInflater mLayoutInflater;
     protected LayoutInflater mLandscapeInflater;

     protected FrameLayout mHorizontal;
     protected FrameLayout mVertical;

     @VisibleForTesting
     SparseArray<ButtonDispatcher> mButtonDispatchers;
     private String mCurrentLayout;

     private View mLastPortrait;
     private View mLastLandscape;

     private boolean mIsVertical;
     private boolean mAlternativeOrder;
     private boolean mUsingCustomLayout;

     private OverviewProxyService mOverviewProxyService;

     public NavigationBarInflaterView(Context context, AttributeSet attrs) {
         super(context, attrs);
         createInflaters();
         mOverviewProxyService = Dependency.get(OverviewProxyService.class);
     }

     @VisibleForTesting
     void createInflaters() {
         mLayoutInflater = LayoutInflater.from(mContext);
         Configuration landscape = new Configuration();
         landscape.setTo(mContext.getResources().getConfiguration());
         landscape.orientation = Configuration.ORIENTATION_LANDSCAPE;
         mLandscapeInflater = LayoutInflater.from(mContext.createConfigurationContext(landscape));
     }

     @Override
     protected void onFinishInflate() {
         super.onFinishInflate();
         inflateChildren();
         clearViews();
         inflateLayout(getDefaultLayout());
     }

     private void inflateChildren() {
         removeAllViews();
         mHorizontal = (FrameLayout) mLayoutInflater.inflate(R.layout.navigation_layout,
                 this /* root */, false /* attachToRoot */);
         addView(mHorizontal);
         mVertical = (FrameLayout) mLayoutInflater.inflate(R.layout.navigation_layout_vertical,
                 this /* root */, false /* attachToRoot */);
         addView(mVertical);
         updateAlternativeOrder();
     }

     protected String getDefaultLayout() {
         final int defaultResource = QuickStepContract.isGesturalMode(getContext())
                 ? R.string.config_navBarLayoutHandle
                 : mOverviewProxyService.shouldShowSwipeUpUI()
                         ? R.string.config_navBarLayoutQuickstep
                         : R.string.config_navBarLayout;
         return getContext().getString(defaultResource);
     }

     @Override
     protected void onAttachedToWindow() {
         super.onAttachedToWindow();
         Dependency.get(TunerService.class).addTunable(this, NAV_BAR_VIEWS, NAV_BAR_LEFT,
                 NAV_BAR_RIGHT);
         Dependency.get(PluginManager.class).addPluginListener(this,
                 NavBarButtonProvider.class, true /* Allow multiple */);
     }

     @Override
     protected void onDetachedFromWindow() {
         Dependency.get(TunerService.class).removeTunable(this);
         Dependency.get(PluginManager.class).removePluginListener(this);
         super.onDetachedFromWindow();
     }

     @Override
     public void onTuningChanged(String key, String newValue) {
         if (NAV_BAR_VIEWS.equals(key)) {
             if (!Objects.equals(mCurrentLayout, newValue)) {
                 mUsingCustomLayout = newValue != null;
                 clearViews();
                 inflateLayout(newValue);
             }
         } else if (NAV_BAR_LEFT.equals(key) || NAV_BAR_RIGHT.equals(key)) {
             clearViews();
             inflateLayout(mCurrentLayout);
         }
     }

     public void onLikelyDefaultLayoutChange() {
         // Don't override custom layouts
         if (mUsingCustomLayout) return;

         // Reevaluate new layout
         final String newValue = getDefaultLayout();
         if (!Objects.equals(mCurrentLayout, newValue)) {
             clearViews();
             inflateLayout(newValue);
         }
     }

     public void setButtonDispatchers(SparseArray<ButtonDispatcher> buttonDispatchers) {
         mButtonDispatchers = buttonDispatchers;
         for (int i = 0; i < buttonDispatchers.size(); i++) {
             initiallyFill(buttonDispatchers.valueAt(i));
         }
     }

     void updateButtonDispatchersCurrentView() {
         if (mButtonDispatchers != null) {
             View view = mIsVertical ? mVertical : mHorizontal;
             for (int i = 0; i < mButtonDispatchers.size(); i++) {
                 final ButtonDispatcher dispatcher = mButtonDispatchers.valueAt(i);
                 dispatcher.setCurrentView(view);
             }
         }
     }

     void setVertical(boolean vertical) {
         if (vertical != mIsVertical) {
             mIsVertical = vertical;
         }
     }

     void setAlternativeOrder(boolean alternativeOrder) {
         if (alternativeOrder != mAlternativeOrder) {
             mAlternativeOrder = alternativeOrder;
             updateAlternativeOrder();
         }
     }

     private void updateAlternativeOrder() {
         updateAlternativeOrder(mHorizontal.findViewById(R.id.ends_group));
         updateAlternativeOrder(mHorizontal.findViewById(R.id.center_group));
         updateAlternativeOrder(mVertical.findViewById(R.id.ends_group));
         updateAlternativeOrder(mVertical.findViewById(R.id.center_group));
     }

     private void updateAlternativeOrder(View v) {
         if (v instanceof ReverseLinearLayout) {
             ((ReverseLinearLayout) v).setAlternativeOrder(mAlternativeOrder);
         }
     }

     private void initiallyFill(ButtonDispatcher buttonDispatcher) {
         addAll(buttonDispatcher, mHorizontal.findViewById(R.id.ends_group));
         addAll(buttonDispatcher, mHorizontal.findViewById(R.id.center_group));
         addAll(buttonDispatcher, mVertical.findViewById(R.id.ends_group));
         addAll(buttonDispatcher, mVertical.findViewById(R.id.center_group));
     }

     private void addAll(ButtonDispatcher buttonDispatcher, ViewGroup parent) {
         for (int i = 0; i < parent.getChildCount(); i++) {
             // Need to manually search for each id, just in case each group has more than one
             // of a single id.  It probably mostly a waste of time, but shouldn't take long
             // and will only happen once.
             if (parent.getChildAt(i).getId() == buttonDispatcher.getId()) {
                 buttonDispatcher.addView(parent.getChildAt(i));
             }
             if (parent.getChildAt(i) instanceof ViewGroup) {
                 addAll(buttonDispatcher, (ViewGroup) parent.getChildAt(i));
             }
         }
     }

     protected void inflateLayout(String newLayout) {
         mCurrentLayout = newLayout;
         if (newLayout == null) {
             newLayout = getDefaultLayout();
         }
         String[] sets = newLayout.split(GRAVITY_SEPARATOR, 3);
         if (sets.length != 3) {
             Log.d(TAG, "Invalid layout.");
             newLayout = getDefaultLayout();
             sets = newLayout.split(GRAVITY_SEPARATOR, 3);
         }
         String[] start = sets[0].split(BUTTON_SEPARATOR);
         String[] center = sets[1].split(BUTTON_SEPARATOR);
         String[] end = sets[2].split(BUTTON_SEPARATOR);
         // Inflate these in start to end order or accessibility traversal will be messed up.
         inflateButtons(start, mHorizontal.findViewById(R.id.ends_group),
                 false /* landscape */, true /* start */);
         inflateButtons(start, mVertical.findViewById(R.id.ends_group),
                 true /* landscape */, true /* start */);

         inflateButtons(center, mHorizontal.findViewById(R.id.center_group),
                 false /* landscape */, false /* start */);
         inflateButtons(center, mVertical.findViewById(R.id.center_group),
                 true /* landscape */, false /* start */);

         addGravitySpacer(mHorizontal.findViewById(R.id.ends_group));
         addGravitySpacer(mVertical.findViewById(R.id.ends_group));

         inflateButtons(end, mHorizontal.findViewById(R.id.ends_group),
                 false /* landscape */, false /* start */);
         inflateButtons(end, mVertical.findViewById(R.id.ends_group),
                 true /* landscape */, false /* start */);

         updateButtonDispatchersCurrentView();
     }

     private void addGravitySpacer(LinearLayout layout) {
         layout.addView(new Space(mContext), new LinearLayout.LayoutParams(0, 0, 1));
     }

     private void inflateButtons(String[] buttons, ViewGroup parent, boolean landscape,
             boolean start) {
         for (int i = 0; i < buttons.length; i++) {
             inflateButton(buttons[i], parent, landscape, start);
         }
     }

     private ViewGroup.LayoutParams copy(ViewGroup.LayoutParams layoutParams) {
         if (layoutParams instanceof LinearLayout.LayoutParams) {
             return new LinearLayout.LayoutParams(layoutParams.width, layoutParams.height,
                     ((LinearLayout.LayoutParams) layoutParams).weight);
         }
         return new LayoutParams(layoutParams.width, layoutParams.height);
     }

     @Nullable
     protected View inflateButton(String buttonSpec, ViewGroup parent, boolean landscape,
             boolean start) {
         LayoutInflater inflater = landscape ? mLandscapeInflater : mLayoutInflater;
         View v = createView(buttonSpec, parent, inflater);
         if (v == null) return null;

         v = applySize(v, buttonSpec, landscape, start);
         parent.addView(v);
         addToDispatchers(v);
         View lastView = landscape ? mLastLandscape : mLastPortrait;
         View accessibilityView = v;
         if (v instanceof ReverseRelativeLayout) {
             accessibilityView = ((ReverseRelativeLayout) v).getChildAt(0);
         }
         if (lastView != null) {
             accessibilityView.setAccessibilityTraversalAfter(lastView.getId());
         }
         if (landscape) {
             mLastLandscape = accessibilityView;
         } else {
             mLastPortrait = accessibilityView;
         }
         return v;
     }

     private View applySize(View v, String buttonSpec, boolean landscape, boolean start) {
         String sizeStr = extractSize(buttonSpec);
         if (sizeStr == null) return v;

         if (sizeStr.contains(WEIGHT_SUFFIX)) {
             // To support gravity, wrap in RelativeLayout and apply gravity to it.
             // Children wanting to use gravity must be smaller then the frame.
             float weight = Float.parseFloat(sizeStr.substring(0, sizeStr.indexOf(WEIGHT_SUFFIX)));
             ReverseRelativeLayout frame = new ReverseRelativeLayout(mContext);
             LayoutParams childParams = new LayoutParams(v.getLayoutParams());

             // Compute gravity to apply
             int gravity = (landscape) ? (start ? Gravity.TOP : Gravity.BOTTOM)
                     : (start ? Gravity.START : Gravity.END);
             if (sizeStr.endsWith(WEIGHT_CENTERED_SUFFIX)) gravity = Gravity.CENTER;

             // Set default gravity, flipped if needed in reversed layouts (270 RTL and 90 LTR)
             frame.setDefaultGravity(gravity);
             frame.setGravity(gravity); // Apply gravity to root

             frame.addView(v, childParams);

             // Use weighting to set the width of the frame
             frame.setLayoutParams(new LinearLayout.LayoutParams(0, MATCH_PARENT, weight));

             // Ensure ripples can be drawn outside bounds
             frame.setClipChildren(false);
             frame.setClipToPadding(false);

             return frame;
         }

         float size = Float.parseFloat(sizeStr);
         ViewGroup.LayoutParams params = v.getLayoutParams();
         params.width = (int) (params.width * size);
         return v;
     }

     private View createView(String buttonSpec, ViewGroup parent, LayoutInflater inflater) {
         View v = null;
         String button = extractButton(buttonSpec);
         if (LEFT.equals(button)) {
             String s = Dependency.get(TunerService.class).getValue(NAV_BAR_LEFT, NAVSPACE);
             button = extractButton(s);
         } else if (RIGHT.equals(button)) {
             String s = Dependency.get(TunerService.class).getValue(NAV_BAR_RIGHT, MENU_IME_ROTATE);
             button = extractButton(s);
         }
         // Let plugins go first so they can override a standard view if they want.
         for (NavBarButtonProvider provider : mPlugins) {
             v = provider.createView(buttonSpec, parent);
             if (v != null) return v;
         }
         if (HOME.equals(button)) {
             v = inflater.inflate(R.layout.home, parent, false);
         } else if (BACK.equals(button)) {
             v = inflater.inflate(R.layout.back, parent, false);
         } else if (RECENT.equals(button)) {
             v = inflater.inflate(R.layout.recent_apps, parent, false);
         } else if (MENU_IME_ROTATE.equals(button)) {
             v = inflater.inflate(R.layout.menu_ime, parent, false);
         } else if (NAVSPACE.equals(button)) {
             v = inflater.inflate(R.layout.nav_key_space, parent, false);
         } else if (CLIPBOARD.equals(button)) {
             v = inflater.inflate(R.layout.clipboard, parent, false);
         } else if (CONTEXTUAL.equals(button)) {
             v = inflater.inflate(R.layout.contextual, parent, false);
         } else if (HOME_HANDLE.equals(button)) {
             v = inflater.inflate(R.layout.home_handle, parent, false);
         } else if (button.startsWith(KEY)) {
             String uri = extractImage(button);
             int code = extractKeycode(button);
             v = inflater.inflate(R.layout.custom_key, parent, false);
             ((KeyButtonView) v).setCode(code);
             if (uri != null) {
                 if (uri.contains(":")) {
                     ((KeyButtonView) v).loadAsync(Icon.createWithContentUri(uri));
                 } else if (uri.contains("/")) {
                     int index = uri.indexOf('/');
                     String pkg = uri.substring(0, index);
                     int id = Integer.parseInt(uri.substring(index + 1));
                     ((KeyButtonView) v).loadAsync(Icon.createWithResource(pkg, id));
                 }
             }
         }
         return v;
     }

     public static String extractImage(String buttonSpec) {
         if (!buttonSpec.contains(KEY_IMAGE_DELIM)) {
             return null;
         }
         final int start = buttonSpec.indexOf(KEY_IMAGE_DELIM);
         String subStr = buttonSpec.substring(start + 1, buttonSpec.indexOf(KEY_CODE_END));
         return subStr;
     }

     public static int extractKeycode(String buttonSpec) {
         if (!buttonSpec.contains(KEY_CODE_START)) {
             return 1;
         }
         final int start = buttonSpec.indexOf(KEY_CODE_START);
         String subStr = buttonSpec.substring(start + 1, buttonSpec.indexOf(KEY_IMAGE_DELIM));
         return Integer.parseInt(subStr);
     }

     public static String extractSize(String buttonSpec) {
         if (!buttonSpec.contains(SIZE_MOD_START)) {
             return null;
         }
         final int sizeStart = buttonSpec.indexOf(SIZE_MOD_START);
         return buttonSpec.substring(sizeStart + 1, buttonSpec.indexOf(SIZE_MOD_END));
     }

     public static String extractButton(String buttonSpec) {
         if (!buttonSpec.contains(SIZE_MOD_START)) {
             return buttonSpec;
         }
         return buttonSpec.substring(0, buttonSpec.indexOf(SIZE_MOD_START));
     }

     private void addToDispatchers(View v) {
         if (mButtonDispatchers != null) {
             final int indexOfKey = mButtonDispatchers.indexOfKey(v.getId());
             if (indexOfKey >= 0) {
                 mButtonDispatchers.valueAt(indexOfKey).addView(v);
             }
             if (v instanceof ViewGroup) {
                 final ViewGroup viewGroup = (ViewGroup)v;
                 final int N = viewGroup.getChildCount();
                 for (int i = 0; i < N; i++) {
                     addToDispatchers(viewGroup.getChildAt(i));
                 }
             }
         }
     }


     private void clearViews() {
         if (mButtonDispatchers != null) {
             for (int i = 0; i < mButtonDispatchers.size(); i++) {
                 mButtonDispatchers.valueAt(i).clear();
             }
         }
         clearAllChildren(mHorizontal.findViewById(R.id.nav_buttons));
         clearAllChildren(mVertical.findViewById(R.id.nav_buttons));
     }

     private void clearAllChildren(ViewGroup group) {
         for (int i = 0; i < group.getChildCount(); i++) {
             ((ViewGroup) group.getChildAt(i)).removeAllViews();
         }
     }

     @Override
     public void onPluginConnected(NavBarButtonProvider plugin, Context context) {
         mPlugins.add(plugin);
         clearViews();
         inflateLayout(mCurrentLayout);
     }

     @Override
     public void onPluginDisconnected(NavBarButtonProvider plugin) {
         mPlugins.remove(plugin);
         clearViews();
         inflateLayout(mCurrentLayout);
     }
 }
	/*
	* Copyright (C) 2016 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
	* except in compliance with the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software distributed under the
	* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	* KIND, either express or implied. See the License for the specific language governing
	* permissions and limitations under the License.
	*/

	package com.android.systemui.statusbar.phone;

	import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;

	import android.annotation.Nullable;
	import android.content.Context;
	import android.content.res.Configuration;
	import android.graphics.drawable.Icon;
	import android.util.AttributeSet;
	import android.util.Log;
	import android.util.SparseArray;
	import android.view.Gravity;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.FrameLayout;
	import android.widget.LinearLayout;
	import android.widget.Space;

	import com.android.internal.annotations.VisibleForTesting;
	import com.android.systemui.Dependency;
	import com.android.systemui.R;
	import com.android.systemui.plugins.PluginListener;
	import com.android.systemui.plugins.statusbar.phone.NavBarButtonProvider;
	import com.android.systemui.recents.OverviewProxyService;
	import com.android.systemui.shared.plugins.PluginManager;
	import com.android.systemui.shared.system.QuickStepContract;
	import com.android.systemui.statusbar.phone.ReverseLinearLayout.ReverseRelativeLayout;
	import com.android.systemui.statusbar.policy.KeyButtonView;
	import com.android.systemui.tuner.TunerService;
	import com.android.systemui.tuner.TunerService.Tunable;

	import java.util.ArrayList;
	import java.util.List;
	import java.util.Objects;

	public class NavigationBarInflaterView extends FrameLayout
	implements Tunable, PluginListener<NavBarButtonProvider> {

	private static final String TAG = "NavBarInflater";

	public static final String NAV_BAR_VIEWS = "sysui_nav_bar";
	public static final String NAV_BAR_LEFT = "sysui_nav_bar_left";
	public static final String NAV_BAR_RIGHT = "sysui_nav_bar_right";

	public static final String MENU_IME_ROTATE = "menu_ime";
	public static final String BACK = "back";
	public static final String HOME = "home";
	public static final String RECENT = "recent";
	public static final String NAVSPACE = "space";
	public static final String CLIPBOARD = "clipboard";
	public static final String HOME_HANDLE = "home_handle";
	public static final String KEY = "key";
	public static final String LEFT = "left";
	public static final String RIGHT = "right";
	public static final String CONTEXTUAL = "contextual";

	public static final String GRAVITY_SEPARATOR = ";";
	public static final String BUTTON_SEPARATOR = ",";

	public static final String SIZE_MOD_START = "[";
	public static final String SIZE_MOD_END = "]";

	public static final String KEY_CODE_START = "(";
	public static final String KEY_IMAGE_DELIM = ":";
	public static final String KEY_CODE_END = ")";
	private static final String WEIGHT_SUFFIX = "W";
	private static final String WEIGHT_CENTERED_SUFFIX = "WC";

	private final List<NavBarButtonProvider> mPlugins = new ArrayList<>();

	protected LayoutInflater mLayoutInflater;
	protected LayoutInflater mLandscapeInflater;

	protected FrameLayout mHorizontal;
	protected FrameLayout mVertical;

	@VisibleForTesting
	SparseArray<ButtonDispatcher> mButtonDispatchers;
	private String mCurrentLayout;

	private View mLastPortrait;
	private View mLastLandscape;

	private boolean mIsVertical;
	private boolean mAlternativeOrder;
	private boolean mUsingCustomLayout;

	private OverviewProxyService mOverviewProxyService;

	public NavigationBarInflaterView(Context context, AttributeSet attrs) {
	super(context, attrs);
	createInflaters();
	mOverviewProxyService = Dependency.get(OverviewProxyService.class);
	}

	@VisibleForTesting
	void createInflaters() {
	mLayoutInflater = LayoutInflater.from(mContext);
	Configuration landscape = new Configuration();
	landscape.setTo(mContext.getResources().getConfiguration());
	landscape.orientation = Configuration.ORIENTATION_LANDSCAPE;
	mLandscapeInflater = LayoutInflater.from(mContext.createConfigurationContext(landscape));
	}

	@Override
	protected void onFinishInflate() {
	super.onFinishInflate();
	inflateChildren();
	clearViews();
	inflateLayout(getDefaultLayout());
	}

	private void inflateChildren() {
	removeAllViews();
	mHorizontal = (FrameLayout) mLayoutInflater.inflate(R.layout.navigation_layout,
	this /* root /, false / attachToRoot */);
	addView(mHorizontal);
	mVertical = (FrameLayout) mLayoutInflater.inflate(R.layout.navigation_layout_vertical,
	this /* root /, false / attachToRoot */);
	addView(mVertical);
	updateAlternativeOrder();
	}

	protected String getDefaultLayout() {
	final int defaultResource = QuickStepContract.isGesturalMode(getContext())
	? R.string.config_navBarLayoutHandle
	: mOverviewProxyService.shouldShowSwipeUpUI()
	? R.string.config_navBarLayoutQuickstep
	: R.string.config_navBarLayout;
	return getContext().getString(defaultResource);
	}

	@Override
	protected void onAttachedToWindow() {
	super.onAttachedToWindow();
	Dependency.get(TunerService.class).addTunable(this, NAV_BAR_VIEWS, NAV_BAR_LEFT,
	NAV_BAR_RIGHT);
	Dependency.get(PluginManager.class).addPluginListener(this,
	NavBarButtonProvider.class, true /* Allow multiple */);
	}

	@Override
	protected void onDetachedFromWindow() {
	Dependency.get(TunerService.class).removeTunable(this);
	Dependency.get(PluginManager.class).removePluginListener(this);
	super.onDetachedFromWindow();
	}

	@Override
	public void onTuningChanged(String key, String newValue) {
	if (NAV_BAR_VIEWS.equals(key)) {
	if (!Objects.equals(mCurrentLayout, newValue)) {
	mUsingCustomLayout = newValue != null;
	clearViews();
	inflateLayout(newValue);
	}
	} else if (NAV_BAR_LEFT.equals(key) \|\| NAV_BAR_RIGHT.equals(key)) {
	clearViews();
	inflateLayout(mCurrentLayout);
	}
	}

	public void onLikelyDefaultLayoutChange() {
	// Don't override custom layouts
	if (mUsingCustomLayout) return;

	// Reevaluate new layout
	final String newValue = getDefaultLayout();
	if (!Objects.equals(mCurrentLayout, newValue)) {
	clearViews();
	inflateLayout(newValue);
	}
	}

	public void setButtonDispatchers(SparseArray<ButtonDispatcher> buttonDispatchers) {
	mButtonDispatchers = buttonDispatchers;
	for (int i = 0; i < buttonDispatchers.size(); i++) {
	initiallyFill(buttonDispatchers.valueAt(i));
	}
	}

	void updateButtonDispatchersCurrentView() {
	if (mButtonDispatchers != null) {
	View view = mIsVertical ? mVertical : mHorizontal;
	for (int i = 0; i < mButtonDispatchers.size(); i++) {
	final ButtonDispatcher dispatcher = mButtonDispatchers.valueAt(i);
	dispatcher.setCurrentView(view);
	}
	}
	}

	void setVertical(boolean vertical) {
	if (vertical != mIsVertical) {
	mIsVertical = vertical;
	}
	}

	void setAlternativeOrder(boolean alternativeOrder) {
	if (alternativeOrder != mAlternativeOrder) {
	mAlternativeOrder = alternativeOrder;
	updateAlternativeOrder();
	}
	}

	private void updateAlternativeOrder() {
	updateAlternativeOrder(mHorizontal.findViewById(R.id.ends_group));
	updateAlternativeOrder(mHorizontal.findViewById(R.id.center_group));
	updateAlternativeOrder(mVertical.findViewById(R.id.ends_group));
	updateAlternativeOrder(mVertical.findViewById(R.id.center_group));
	}

	private void updateAlternativeOrder(View v) {
	if (v instanceof ReverseLinearLayout) {
	((ReverseLinearLayout) v).setAlternativeOrder(mAlternativeOrder);
	}
	}

	private void initiallyFill(ButtonDispatcher buttonDispatcher) {
	addAll(buttonDispatcher, mHorizontal.findViewById(R.id.ends_group));
	addAll(buttonDispatcher, mHorizontal.findViewById(R.id.center_group));
	addAll(buttonDispatcher, mVertical.findViewById(R.id.ends_group));
	addAll(buttonDispatcher, mVertical.findViewById(R.id.center_group));
	}

	private void addAll(ButtonDispatcher buttonDispatcher, ViewGroup parent) {
	for (int i = 0; i < parent.getChildCount(); i++) {
	// Need to manually search for each id, just in case each group has more than one
	// of a single id. It probably mostly a waste of time, but shouldn't take long
	// and will only happen once.
	if (parent.getChildAt(i).getId() == buttonDispatcher.getId()) {
	buttonDispatcher.addView(parent.getChildAt(i));
	}
	if (parent.getChildAt(i) instanceof ViewGroup) {
	addAll(buttonDispatcher, (ViewGroup) parent.getChildAt(i));
	}
	}
	}

	protected void inflateLayout(String newLayout) {
	mCurrentLayout = newLayout;
	if (newLayout == null) {
	newLayout = getDefaultLayout();
	}
	String[] sets = newLayout.split(GRAVITY_SEPARATOR, 3);
	if (sets.length != 3) {
	Log.d(TAG, "Invalid layout.");
	newLayout = getDefaultLayout();
	sets = newLayout.split(GRAVITY_SEPARATOR, 3);
	}
	String[] start = sets[0].split(BUTTON_SEPARATOR);
	String[] center = sets[1].split(BUTTON_SEPARATOR);
	String[] end = sets[2].split(BUTTON_SEPARATOR);
	// Inflate these in start to end order or accessibility traversal will be messed up.
	inflateButtons(start, mHorizontal.findViewById(R.id.ends_group),
	false /* landscape /, true / start */);
	inflateButtons(start, mVertical.findViewById(R.id.ends_group),
	true /* landscape /, true / start */);

	inflateButtons(center, mHorizontal.findViewById(R.id.center_group),
	false /* landscape /, false / start */);
	inflateButtons(center, mVertical.findViewById(R.id.center_group),
	true /* landscape /, false / start */);

	addGravitySpacer(mHorizontal.findViewById(R.id.ends_group));
	addGravitySpacer(mVertical.findViewById(R.id.ends_group));

	inflateButtons(end, mHorizontal.findViewById(R.id.ends_group),
	false /* landscape /, false / start */);
	inflateButtons(end, mVertical.findViewById(R.id.ends_group),
	true /* landscape /, false / start */);

	updateButtonDispatchersCurrentView();
	}

	private void addGravitySpacer(LinearLayout layout) {
	layout.addView(new Space(mContext), new LinearLayout.LayoutParams(0, 0, 1));
	}

	private void inflateButtons(String[] buttons, ViewGroup parent, boolean landscape,
	boolean start) {
	for (int i = 0; i < buttons.length; i++) {
	inflateButton(buttons[i], parent, landscape, start);
	}
	}

	private ViewGroup.LayoutParams copy(ViewGroup.LayoutParams layoutParams) {
	if (layoutParams instanceof LinearLayout.LayoutParams) {
	return new LinearLayout.LayoutParams(layoutParams.width, layoutParams.height,
	((LinearLayout.LayoutParams) layoutParams).weight);
	}
	return new LayoutParams(layoutParams.width, layoutParams.height);
	}

	@Nullable
	protected View inflateButton(String buttonSpec, ViewGroup parent, boolean landscape,
	boolean start) {
	LayoutInflater inflater = landscape ? mLandscapeInflater : mLayoutInflater;
	View v = createView(buttonSpec, parent, inflater);
	if (v == null) return null;

	v = applySize(v, buttonSpec, landscape, start);
	parent.addView(v);
	addToDispatchers(v);
	View lastView = landscape ? mLastLandscape : mLastPortrait;
	View accessibilityView = v;
	if (v instanceof ReverseRelativeLayout) {
	accessibilityView = ((ReverseRelativeLayout) v).getChildAt(0);
	}
	if (lastView != null) {
	accessibilityView.setAccessibilityTraversalAfter(lastView.getId());
	}
	if (landscape) {
	mLastLandscape = accessibilityView;
	} else {
	mLastPortrait = accessibilityView;
	}
	return v;
	}

	private View applySize(View v, String buttonSpec, boolean landscape, boolean start) {
	String sizeStr = extractSize(buttonSpec);
	if (sizeStr == null) return v;

	if (sizeStr.contains(WEIGHT_SUFFIX)) {
	// To support gravity, wrap in RelativeLayout and apply gravity to it.
	// Children wanting to use gravity must be smaller then the frame.
	float weight = Float.parseFloat(sizeStr.substring(0, sizeStr.indexOf(WEIGHT_SUFFIX)));
	ReverseRelativeLayout frame = new ReverseRelativeLayout(mContext);
	LayoutParams childParams = new LayoutParams(v.getLayoutParams());

	// Compute gravity to apply
	int gravity = (landscape) ? (start ? Gravity.TOP : Gravity.BOTTOM)
	: (start ? Gravity.START : Gravity.END);
	if (sizeStr.endsWith(WEIGHT_CENTERED_SUFFIX)) gravity = Gravity.CENTER;

	// Set default gravity, flipped if needed in reversed layouts (270 RTL and 90 LTR)
	frame.setDefaultGravity(gravity);
	frame.setGravity(gravity); // Apply gravity to root

	frame.addView(v, childParams);

	// Use weighting to set the width of the frame
	frame.setLayoutParams(new LinearLayout.LayoutParams(0, MATCH_PARENT, weight));

	// Ensure ripples can be drawn outside bounds
	frame.setClipChildren(false);
	frame.setClipToPadding(false);

	return frame;
	}

	float size = Float.parseFloat(sizeStr);
	ViewGroup.LayoutParams params = v.getLayoutParams();
	params.width = (int) (params.width * size);
	return v;
	}

	private View createView(String buttonSpec, ViewGroup parent, LayoutInflater inflater) {
	View v = null;
	String button = extractButton(buttonSpec);
	if (LEFT.equals(button)) {
	String s = Dependency.get(TunerService.class).getValue(NAV_BAR_LEFT, NAVSPACE);
	button = extractButton(s);
	} else if (RIGHT.equals(button)) {
	String s = Dependency.get(TunerService.class).getValue(NAV_BAR_RIGHT, MENU_IME_ROTATE);
	button = extractButton(s);
	}
	// Let plugins go first so they can override a standard view if they want.
	for (NavBarButtonProvider provider : mPlugins) {
	v = provider.createView(buttonSpec, parent);
	if (v != null) return v;
	}
	if (HOME.equals(button)) {
	v = inflater.inflate(R.layout.home, parent, false);
	} else if (BACK.equals(button)) {
	v = inflater.inflate(R.layout.back, parent, false);
	} else if (RECENT.equals(button)) {
	v = inflater.inflate(R.layout.recent_apps, parent, false);
	} else if (MENU_IME_ROTATE.equals(button)) {
	v = inflater.inflate(R.layout.menu_ime, parent, false);
	} else if (NAVSPACE.equals(button)) {
	v = inflater.inflate(R.layout.nav_key_space, parent, false);
	} else if (CLIPBOARD.equals(button)) {
	v = inflater.inflate(R.layout.clipboard, parent, false);
	} else if (CONTEXTUAL.equals(button)) {
	v = inflater.inflate(R.layout.contextual, parent, false);
	} else if (HOME_HANDLE.equals(button)) {
	v = inflater.inflate(R.layout.home_handle, parent, false);
	} else if (button.startsWith(KEY)) {
	String uri = extractImage(button);
	int code = extractKeycode(button);
	v = inflater.inflate(R.layout.custom_key, parent, false);
	((KeyButtonView) v).setCode(code);
	if (uri != null) {
	if (uri.contains(":")) {
	((KeyButtonView) v).loadAsync(Icon.createWithContentUri(uri));
	} else if (uri.contains("/")) {
	int index = uri.indexOf('/');
	String pkg = uri.substring(0, index);
	int id = Integer.parseInt(uri.substring(index + 1));
	((KeyButtonView) v).loadAsync(Icon.createWithResource(pkg, id));
	}
	}
	}
	return v;
	}

	public static String extractImage(String buttonSpec) {
	if (!buttonSpec.contains(KEY_IMAGE_DELIM)) {
	return null;
	}
	final int start = buttonSpec.indexOf(KEY_IMAGE_DELIM);
	String subStr = buttonSpec.substring(start + 1, buttonSpec.indexOf(KEY_CODE_END));
	return subStr;
	}

	public static int extractKeycode(String buttonSpec) {
	if (!buttonSpec.contains(KEY_CODE_START)) {
	return 1;
	}
	final int start = buttonSpec.indexOf(KEY_CODE_START);
	String subStr = buttonSpec.substring(start + 1, buttonSpec.indexOf(KEY_IMAGE_DELIM));
	return Integer.parseInt(subStr);
	}

	public static String extractSize(String buttonSpec) {
	if (!buttonSpec.contains(SIZE_MOD_START)) {
	return null;
	}
	final int sizeStart = buttonSpec.indexOf(SIZE_MOD_START);
	return buttonSpec.substring(sizeStart + 1, buttonSpec.indexOf(SIZE_MOD_END));
	}

	public static String extractButton(String buttonSpec) {
	if (!buttonSpec.contains(SIZE_MOD_START)) {
	return buttonSpec;
	}
	return buttonSpec.substring(0, buttonSpec.indexOf(SIZE_MOD_START));
	}

	private void addToDispatchers(View v) {
	if (mButtonDispatchers != null) {
	final int indexOfKey = mButtonDispatchers.indexOfKey(v.getId());
	if (indexOfKey >= 0) {
	mButtonDispatchers.valueAt(indexOfKey).addView(v);
	}
	if (v instanceof ViewGroup) {
	final ViewGroup viewGroup = (ViewGroup)v;
	final int N = viewGroup.getChildCount();
	for (int i = 0; i < N; i++) {
	addToDispatchers(viewGroup.getChildAt(i));
	}
	}
	}
	}



	private void clearViews() {
	if (mButtonDispatchers != null) {
	for (int i = 0; i < mButtonDispatchers.size(); i++) {
	mButtonDispatchers.valueAt(i).clear();
	}
	}
	clearAllChildren(mHorizontal.findViewById(R.id.nav_buttons));
	clearAllChildren(mVertical.findViewById(R.id.nav_buttons));
	}

	private void clearAllChildren(ViewGroup group) {
	for (int i = 0; i < group.getChildCount(); i++) {
	((ViewGroup) group.getChildAt(i)).removeAllViews();
	}
	}

	@Override
	public void onPluginConnected(NavBarButtonProvider plugin, Context context) {
	mPlugins.add(plugin);
	clearViews();
	inflateLayout(mCurrentLayout);
	}

	@Override
	public void onPluginDisconnected(NavBarButtonProvider plugin) {
	mPlugins.remove(plugin);
	clearViews();
	inflateLayout(mCurrentLayout);
	}
	}