packages/SystemUI/src/com/android/systemui/statusbar/car/UserGridView.java - platform/frameworks/base - Gitiles

 /*
  * Copyright (C) 2015 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.car;

 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Paint.Align;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.GradientDrawable;
 import android.os.UserHandle;
 import android.support.v4.view.PagerAdapter;
 import android.support.v4.view.ViewPager;
 import android.util.AttributeSet;
 import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.TextView;

 import com.android.internal.util.UserIcons;
 import com.android.systemui.R;
 import com.android.systemui.statusbar.UserUtil;
 import com.android.systemui.statusbar.phone.StatusBar;
 import com.android.systemui.statusbar.policy.UserSwitcherController;

 /**
  * Displays a ViewPager with icons for the users in the system to allow switching between users.
  * One of the uses of this is for the lock screen in auto.
  */
 public class UserGridView extends ViewPager {
     private StatusBar mStatusBar;
     private UserSwitcherController mUserSwitcherController;
     private Adapter mAdapter;
     private UserSelectionListener mUserSelectionListener;

     public UserGridView(Context context, AttributeSet attrs) {
         super(context, attrs);
     }

     public void init(StatusBar statusBar, UserSwitcherController userSwitcherController) {
         mStatusBar = statusBar;
         mUserSwitcherController = userSwitcherController;
         mAdapter = new Adapter(mUserSwitcherController);
         addOnLayoutChangeListener(mAdapter);
         setAdapter(mAdapter);
     }

     public void onUserSwitched(int newUserId) {
         // Bring up security view after user switch is completed.
         post(this::showOfflineAuthUi);
     }

     public void setUserSelectionListener(UserSelectionListener userSelectionListener) {
         mUserSelectionListener = userSelectionListener;
     }

     void showOfflineAuthUi() {
         // TODO: Show keyguard UI in-place.
         mStatusBar.executeRunnableDismissingKeyguard(null, null, true, true, true);
     }

     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         // Wrap content doesn't work in ViewPagers, so simulate the behavior in code.
         int height = 0;
         for(int i = 0; i < getChildCount(); i++) {
             View child = getChildAt(i);
             child.measure(widthMeasureSpec,
                     MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
             height = Math.max(child.getMeasuredHeight(), height);
         }
         heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     }

     /**
      * This is a ViewPager.PagerAdapter which deletegates the work to a
      * UserSwitcherController.BaseUserAdapter. Java doesn't support multiple inheritance so we have
      * to use composition instead to achieve the same goal since both the base classes are abstract
      * classes and not interfaces.
      */
     private final class Adapter extends PagerAdapter implements View.OnLayoutChangeListener {
         private final int mPodWidth;
         private final int mPodMargin;

         private final WrappedBaseUserAdapter mUserAdapter;
         private int mContainerWidth;

         public Adapter(UserSwitcherController controller) {
             super();
             mUserAdapter = new WrappedBaseUserAdapter(controller, this);
             mPodWidth = getResources().getDimensionPixelSize(
                     R.dimen.car_fullscreen_user_pod_image_avatar_width);
             mPodMargin = getResources().getDimensionPixelSize(
                     R.dimen.car_fullscreen_user_pod_margin_side);
         }

         @Override
         public void destroyItem(ViewGroup container, int position, Object object) {
             container.removeView((View) object);
         }

         private int getIconsPerPage() {
             // We need to know how many pods we need in this page. Each pod has its own width and
             // margins on both sides. We can then divide the measured width of the parent by the
             // sum of pod width and margin to get the number of pods that will completely fit.
             return mContainerWidth / (mPodWidth + mPodMargin * 2);
         }

         @Override
         public Object instantiateItem(ViewGroup container, int position) {
             Context context = getContext();
             LayoutInflater inflater = LayoutInflater.from(context);

             ViewGroup pods = (ViewGroup) inflater.inflate(
                     R.layout.car_fullscreen_user_pod_container, null);

             int iconsPerPage = getIconsPerPage();
             int limit = Math.min(mUserAdapter.getCount(), (position + 1) * iconsPerPage);
             for (int i = position * iconsPerPage; i < limit; i++) {
                 pods.addView(makeUserPod(inflater, context, i, pods));
             }
             container.addView(pods);
             return pods;
         }

         /**
          * Returns the default user icon.  This icon is a circle with a letter in it.  The letter is
          * the first character in the username.
          *
          * @param userName the username of the user for which the icon is to be created
          */
         private Bitmap getDefaultUserIcon(CharSequence userName) {
             CharSequence displayText = userName.subSequence(0, 1);
             Bitmap out = Bitmap.createBitmap(mPodWidth, mPodWidth, Bitmap.Config.ARGB_8888);
             Canvas canvas = new Canvas(out);

             // Draw the circle background.
             GradientDrawable shape = new GradientDrawable();
             shape.setShape(GradientDrawable.RADIAL_GRADIENT);
             shape.setGradientRadius(1.0f);
             shape.setColor(getContext().getColor(R.color.car_user_switcher_no_user_image_bgcolor));
             shape.setBounds(0, 0, mPodWidth, mPodWidth);
             shape.draw(canvas);

             // Draw the letter in the center.
             Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
             paint.setColor(getContext().getColor(R.color.car_user_switcher_no_user_image_fgcolor));
             paint.setTextAlign(Align.CENTER);
             paint.setTextSize(getResources().getDimensionPixelSize(
                     R.dimen.car_fullscreen_user_pod_icon_text_size));
             Paint.FontMetricsInt metrics = paint.getFontMetricsInt();
             // The Y coordinate is measured by taking half the height of the pod, but that would
             // draw the character putting the bottom of the font in the middle of the pod.  To
             // correct this, half the difference between the top and bottom distance metrics of the
             // font gives the offset of the font.  Bottom is a positive value, top is negative, so
             // the different is actually a sum.  The "half" operation is then factored out.
             canvas.drawText(displayText.toString(),
                     mPodWidth / 2, (mPodWidth - (metrics.bottom + metrics.top)) / 2, paint);

             return out;
         }

         private View makeUserPod(LayoutInflater inflater, Context context,
                 int position, ViewGroup parent) {
             final UserSwitcherController.UserRecord record = mUserAdapter.getItem(position);
             View view = inflater.inflate(R.layout.car_fullscreen_user_pod, parent, false);

             TextView nameView = view.findViewById(R.id.user_name);
             if (record != null) {
                 nameView.setText(mUserAdapter.getName(context, record));
                 view.setActivated(record.isCurrent);
             } else {
                 nameView.setText(context.getString(R.string.unknown_user_label));
             }

             ImageView iconView = (ImageView) view.findViewById(R.id.user_avatar);
             if (record == null || (record.picture == null && !record.isAddUser)) {
                 iconView.setImageBitmap(getDefaultUserIcon(nameView.getText()));
             } else if (record.isAddUser) {
                 Drawable icon = context.getDrawable(R.drawable.ic_add_circle_qs);
                 icon.setTint(context.getColor(R.color.car_user_switcher_no_user_image_bgcolor));
                 iconView.setImageDrawable(icon);
             } else {
                 iconView.setImageBitmap(record.picture);
             }

             iconView.setOnClickListener(v -> {
                 if (record == null) {
                     return;
                 }

                 if (mUserSelectionListener != null) {
                     mUserSelectionListener.onUserSelected(record);
                 }

                 if (record.isCurrent) {
                     showOfflineAuthUi();
                 } else {
                     mUserSwitcherController.switchTo(record);
                 }
             });

             return view;
         }

         @Override
         public int getCount() {
             int iconsPerPage = getIconsPerPage();
             if (iconsPerPage == 0) {
                 return 0;
             }
             return (int) Math.ceil((double) mUserAdapter.getCount() / getIconsPerPage());
         }

         public void refresh() {
             mUserAdapter.refresh();
         }

         @Override
         public boolean isViewFromObject(View view, Object object) {
             return view == object;
         }

         @Override
         public void onLayoutChange(View v, int left, int top, int right, int bottom,
                 int oldLeft, int oldTop, int oldRight, int oldBottom) {
             mContainerWidth = Math.max(left - right, right - left);
             notifyDataSetChanged();
         }
     }

     private final class WrappedBaseUserAdapter extends UserSwitcherController.BaseUserAdapter {
         private Adapter mContainer;

         public WrappedBaseUserAdapter(UserSwitcherController controller, Adapter container) {
             super(controller);
             mContainer = container;
         }

         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
             throw new UnsupportedOperationException("unused");
         }

         @Override
         public void notifyDataSetChanged() {
             super.notifyDataSetChanged();
             mContainer.notifyDataSetChanged();
         }
     }

     interface UserSelectionListener {
         void onUserSelected(UserSwitcherController.UserRecord record);
     };
 }
	/*
	* Copyright (C) 2015 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.car;

	import android.content.Context;
	import android.graphics.Bitmap;
	import android.graphics.Canvas;
	import android.graphics.Color;
	import android.graphics.Paint;
	import android.graphics.Paint.Align;
	import android.graphics.drawable.Drawable;
	import android.graphics.drawable.GradientDrawable;
	import android.os.UserHandle;
	import android.support.v4.view.PagerAdapter;
	import android.support.v4.view.ViewPager;
	import android.util.AttributeSet;
	import android.view.Gravity;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.ImageView;
	import android.widget.LinearLayout;
	import android.widget.TextView;

	import com.android.internal.util.UserIcons;
	import com.android.systemui.R;
	import com.android.systemui.statusbar.UserUtil;
	import com.android.systemui.statusbar.phone.StatusBar;
	import com.android.systemui.statusbar.policy.UserSwitcherController;

	/**
	* Displays a ViewPager with icons for the users in the system to allow switching between users.
	* One of the uses of this is for the lock screen in auto.
	*/
	public class UserGridView extends ViewPager {
	private StatusBar mStatusBar;
	private UserSwitcherController mUserSwitcherController;
	private Adapter mAdapter;
	private UserSelectionListener mUserSelectionListener;

	public UserGridView(Context context, AttributeSet attrs) {
	super(context, attrs);
	}

	public void init(StatusBar statusBar, UserSwitcherController userSwitcherController) {
	mStatusBar = statusBar;
	mUserSwitcherController = userSwitcherController;
	mAdapter = new Adapter(mUserSwitcherController);
	addOnLayoutChangeListener(mAdapter);
	setAdapter(mAdapter);
	}

	public void onUserSwitched(int newUserId) {
	// Bring up security view after user switch is completed.
	post(this::showOfflineAuthUi);
	}

	public void setUserSelectionListener(UserSelectionListener userSelectionListener) {
	mUserSelectionListener = userSelectionListener;
	}

	void showOfflineAuthUi() {
	// TODO: Show keyguard UI in-place.
	mStatusBar.executeRunnableDismissingKeyguard(null, null, true, true, true);
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
	// Wrap content doesn't work in ViewPagers, so simulate the behavior in code.
	int height = 0;
	for(int i = 0; i < getChildCount(); i++) {
	View child = getChildAt(i);
	child.measure(widthMeasureSpec,
	MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
	height = Math.max(child.getMeasuredHeight(), height);
	}
	heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
	super.onMeasure(widthMeasureSpec, heightMeasureSpec);
	}

	/**
	* This is a ViewPager.PagerAdapter which deletegates the work to a
	* UserSwitcherController.BaseUserAdapter. Java doesn't support multiple inheritance so we have
	* to use composition instead to achieve the same goal since both the base classes are abstract
	* classes and not interfaces.
	*/
	private final class Adapter extends PagerAdapter implements View.OnLayoutChangeListener {
	private final int mPodWidth;
	private final int mPodMargin;

	private final WrappedBaseUserAdapter mUserAdapter;
	private int mContainerWidth;

	public Adapter(UserSwitcherController controller) {
	super();
	mUserAdapter = new WrappedBaseUserAdapter(controller, this);
	mPodWidth = getResources().getDimensionPixelSize(
	R.dimen.car_fullscreen_user_pod_image_avatar_width);
	mPodMargin = getResources().getDimensionPixelSize(
	R.dimen.car_fullscreen_user_pod_margin_side);
	}

	@Override
	public void destroyItem(ViewGroup container, int position, Object object) {
	container.removeView((View) object);
	}

	private int getIconsPerPage() {
	// We need to know how many pods we need in this page. Each pod has its own width and
	// margins on both sides. We can then divide the measured width of the parent by the
	// sum of pod width and margin to get the number of pods that will completely fit.
	return mContainerWidth / (mPodWidth + mPodMargin * 2);
	}

	@Override
	public Object instantiateItem(ViewGroup container, int position) {
	Context context = getContext();
	LayoutInflater inflater = LayoutInflater.from(context);

	ViewGroup pods = (ViewGroup) inflater.inflate(
	R.layout.car_fullscreen_user_pod_container, null);

	int iconsPerPage = getIconsPerPage();
	int limit = Math.min(mUserAdapter.getCount(), (position + 1) * iconsPerPage);
	for (int i = position * iconsPerPage; i < limit; i++) {
	pods.addView(makeUserPod(inflater, context, i, pods));
	}
	container.addView(pods);
	return pods;
	}

	/**
	* Returns the default user icon. This icon is a circle with a letter in it. The letter is
	* the first character in the username.
	*
	* @param userName the username of the user for which the icon is to be created
	*/
	private Bitmap getDefaultUserIcon(CharSequence userName) {
	CharSequence displayText = userName.subSequence(0, 1);
	Bitmap out = Bitmap.createBitmap(mPodWidth, mPodWidth, Bitmap.Config.ARGB_8888);
	Canvas canvas = new Canvas(out);

	// Draw the circle background.
	GradientDrawable shape = new GradientDrawable();
	shape.setShape(GradientDrawable.RADIAL_GRADIENT);
	shape.setGradientRadius(1.0f);
	shape.setColor(getContext().getColor(R.color.car_user_switcher_no_user_image_bgcolor));
	shape.setBounds(0, 0, mPodWidth, mPodWidth);
	shape.draw(canvas);

	// Draw the letter in the center.
	Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
	paint.setColor(getContext().getColor(R.color.car_user_switcher_no_user_image_fgcolor));
	paint.setTextAlign(Align.CENTER);
	paint.setTextSize(getResources().getDimensionPixelSize(
	R.dimen.car_fullscreen_user_pod_icon_text_size));
	Paint.FontMetricsInt metrics = paint.getFontMetricsInt();
	// The Y coordinate is measured by taking half the height of the pod, but that would
	// draw the character putting the bottom of the font in the middle of the pod. To
	// correct this, half the difference between the top and bottom distance metrics of the
	// font gives the offset of the font. Bottom is a positive value, top is negative, so
	// the different is actually a sum. The "half" operation is then factored out.
	canvas.drawText(displayText.toString(),
	mPodWidth / 2, (mPodWidth - (metrics.bottom + metrics.top)) / 2, paint);

	return out;
	}

	private View makeUserPod(LayoutInflater inflater, Context context,
	int position, ViewGroup parent) {
	final UserSwitcherController.UserRecord record = mUserAdapter.getItem(position);
	View view = inflater.inflate(R.layout.car_fullscreen_user_pod, parent, false);

	TextView nameView = view.findViewById(R.id.user_name);
	if (record != null) {
	nameView.setText(mUserAdapter.getName(context, record));
	view.setActivated(record.isCurrent);
	} else {
	nameView.setText(context.getString(R.string.unknown_user_label));
	}

	ImageView iconView = (ImageView) view.findViewById(R.id.user_avatar);
	if (record == null \|\| (record.picture == null && !record.isAddUser)) {
	iconView.setImageBitmap(getDefaultUserIcon(nameView.getText()));
	} else if (record.isAddUser) {
	Drawable icon = context.getDrawable(R.drawable.ic_add_circle_qs);
	icon.setTint(context.getColor(R.color.car_user_switcher_no_user_image_bgcolor));
	iconView.setImageDrawable(icon);
	} else {
	iconView.setImageBitmap(record.picture);
	}

	iconView.setOnClickListener(v -> {
	if (record == null) {
	return;
	}

	if (mUserSelectionListener != null) {
	mUserSelectionListener.onUserSelected(record);
	}

	if (record.isCurrent) {
	showOfflineAuthUi();
	} else {
	mUserSwitcherController.switchTo(record);
	}
	});

	return view;
	}

	@Override
	public int getCount() {
	int iconsPerPage = getIconsPerPage();
	if (iconsPerPage == 0) {
	return 0;
	}
	return (int) Math.ceil((double) mUserAdapter.getCount() / getIconsPerPage());
	}

	public void refresh() {
	mUserAdapter.refresh();
	}

	@Override
	public boolean isViewFromObject(View view, Object object) {
	return view == object;
	}

	@Override
	public void onLayoutChange(View v, int left, int top, int right, int bottom,
	int oldLeft, int oldTop, int oldRight, int oldBottom) {
	mContainerWidth = Math.max(left - right, right - left);
	notifyDataSetChanged();
	}
	}

	private final class WrappedBaseUserAdapter extends UserSwitcherController.BaseUserAdapter {
	private Adapter mContainer;

	public WrappedBaseUserAdapter(UserSwitcherController controller, Adapter container) {
	super(controller);
	mContainer = container;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
	throw new UnsupportedOperationException("unused");
	}

	@Override
	public void notifyDataSetChanged() {
	super.notifyDataSetChanged();
	mContainer.notifyDataSetChanged();
	}
	}

	interface UserSelectionListener {
	void onUserSelected(UserSwitcherController.UserRecord record);
	};
	}