src/com/android/settings/display/PreviewSeekBarPreferenceFragment.java - LeafOS-Project/android_packages_apps_Settings - Gitiles

 /*
  * Copyright (C) 2018 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.settings.display;

 import android.content.Context;
 import android.content.res.Configuration;
 import android.os.Bundle;
 import android.os.SystemClock;
 import android.view.Choreographer;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.accessibility.AccessibilityEvent;
 import android.widget.SeekBar;
 import android.widget.SeekBar.OnSeekBarChangeListener;
 import android.widget.TextView;

 import androidx.viewpager.widget.ViewPager;
 import androidx.viewpager.widget.ViewPager.OnPageChangeListener;

 import com.android.settings.R;
 import com.android.settings.SettingsPreferenceFragment;
 import com.android.settings.widget.DotsPageIndicator;
 import com.android.settings.widget.LabeledSeekBar;

 /**
  * Preference fragment shows a preview and a seek bar to adjust a specific settings.
  */
 public abstract class PreviewSeekBarPreferenceFragment extends SettingsPreferenceFragment {

     /** List of entries corresponding the settings being set. */
     protected String[] mEntries;

     /** Index of the entry corresponding to initial value of the settings. */
     protected int mInitialIndex;

     /** Index of the entry corresponding to current value of the settings. */
     protected int mCurrentIndex;

     private ViewPager mPreviewPager;
     private PreviewPagerAdapter mPreviewPagerAdapter;
     private DotsPageIndicator mPageIndicator;

     private TextView mLabel;
     private LabeledSeekBar mSeekBar;
     private View mLarger;
     private View mSmaller;

     private static final long MIN_COMMIT_INTERVAL_MS = 800;
     private long mLastCommitTime;

     private class onPreviewSeekBarChangeListener implements OnSeekBarChangeListener {
         private static final long CHANGE_BY_SEEKBAR_DELAY_MS = 100;
         private static final long CHANGE_BY_BUTTON_DELAY_MS = 300;

         private boolean mSeekByTouch;
         private boolean mIsChanged;
         private long mCommitDelayMs;

         private final Choreographer.FrameCallback mCommit = f -> {
             commit();
             mLastCommitTime = SystemClock.elapsedRealtime();
         };

         @Override
         public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
             if (mCurrentIndex == progress) {
                 mIsChanged = false;
                 return;
             }
             mIsChanged = true;
             setPreviewLayer(progress, false);
             if (mSeekByTouch) {
                 mCommitDelayMs = CHANGE_BY_SEEKBAR_DELAY_MS;
             } else {
                 mCommitDelayMs = CHANGE_BY_BUTTON_DELAY_MS;
                 commitOnNextFrame();
             }
         }

         @Override
         public void onStartTrackingTouch(SeekBar seekBar) {
             mSeekByTouch = true;
         }

         @Override
         public void onStopTrackingTouch(SeekBar seekBar) {
             mSeekByTouch = false;
             if (!mIsChanged) {
                 return;
             }
             if (mPreviewPagerAdapter.isAnimating()) {
                 mPreviewPagerAdapter.setAnimationEndAction(this::commitOnNextFrame);
             } else {
                 commitOnNextFrame();
             }
         }

         private void commitOnNextFrame() {
             if (SystemClock.elapsedRealtime() - mLastCommitTime < MIN_COMMIT_INTERVAL_MS) {
                 mCommitDelayMs += MIN_COMMIT_INTERVAL_MS;
             }
             final Choreographer choreographer = Choreographer.getInstance();
             choreographer.removeFrameCallback(mCommit);
             choreographer.postFrameCallbackDelayed(mCommit, mCommitDelayMs);
         }
     }

     @Override
     public void onSaveInstanceState(Bundle outState) {
         super.onSaveInstanceState(outState);
         outState.putLong("mLastCommitTime", mLastCommitTime);
     }

     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
         if (savedInstanceState != null) {
             mLastCommitTime = savedInstanceState.getLong("mLastCommitTime");
         }
         final View root = super.onCreateView(inflater, container, savedInstanceState);
         final ViewGroup listContainer = root.findViewById(android.R.id.list_container);
         listContainer.removeAllViews();

         final View content = inflater.inflate(getActivityLayoutResId(), listContainer, false);
         listContainer.addView(content);

         mLabel = content.findViewById(R.id.current_label);

         // The maximum SeekBar value always needs to be non-zero. If there's
         // only one available value, we'll handle this by disabling the
         // seek bar.
         final int max = Math.max(1, mEntries.length - 1);

         mSeekBar = content.findViewById(R.id.seek_bar);
         mSeekBar.setLabels(mEntries);
         mSeekBar.setMax(max);

         mSmaller = content.findViewById(R.id.smaller);
         mSmaller.setOnClickListener(v -> {
             final int progress = mSeekBar.getProgress();
             if (progress > 0) {
                 mSeekBar.setProgress(progress - 1, true);
             }
         });

         mLarger = content.findViewById(R.id.larger);
         mLarger.setOnClickListener(v -> {
             final int progress = mSeekBar.getProgress();
             if (progress < mSeekBar.getMax()) {
                 mSeekBar.setProgress(progress + 1, true);
             }
         });

         if (mEntries.length == 1) {
             // The larger and smaller buttons will be disabled when we call
             // setPreviewLayer() later in this method.
             mSeekBar.setEnabled(false);
         }

         final Context context = getContext();
         final Configuration origConfig = context.getResources().getConfiguration();
         final boolean isLayoutRtl = origConfig.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL;
         Configuration[] configurations = new Configuration[mEntries.length];
         for (int i = 0; i < mEntries.length; ++i) {
             configurations[i] = createConfig(origConfig, i);
         }

         final int[] previews = getPreviewSampleResIds();
         mPreviewPager = content.findViewById(R.id.preview_pager);
         mPreviewPagerAdapter = new PreviewPagerAdapter(context, isLayoutRtl,
                 previews, configurations);
         mPreviewPager.setAdapter(mPreviewPagerAdapter);
         mPreviewPager.setCurrentItem(isLayoutRtl ? previews.length - 1 : 0);
         mPreviewPager.addOnPageChangeListener(mPreviewPageChangeListener);

         mPageIndicator = content.findViewById(R.id.page_indicator);
         if (previews.length > 1) {
             mPageIndicator.setViewPager(mPreviewPager);
             mPageIndicator.setVisibility(View.VISIBLE);
             mPageIndicator.setOnPageChangeListener(mPageIndicatorPageChangeListener);
         } else {
             mPageIndicator.setVisibility(View.GONE);
         }

         setPreviewLayer(mInitialIndex, false);
         return root;
     }

     @Override
     public void onStart() {
         super.onStart();
         // Set SeekBar listener here to avoid onProgressChanged() is called
         // during onRestoreInstanceState().
         mSeekBar.setProgress(mCurrentIndex);
         mSeekBar.setOnSeekBarChangeListener(new onPreviewSeekBarChangeListener());
     }

     @Override
     public void onStop() {
         super.onStop();
         mSeekBar.setOnSeekBarChangeListener(null);
     }

     /** Resource id of the layout for this preference fragment. */
     protected abstract int getActivityLayoutResId();

     /** Resource id of the layout that defines the contents inside preview screen. */
     protected abstract int[] getPreviewSampleResIds();

     /**
      * Creates new configuration based on the current position of the SeekBar.
      */
     protected abstract Configuration createConfig(Configuration origConfig, int index);

     /**
      * Persists the selected value and sends a configuration change.
      */
     protected abstract void commit();

     private void setPreviewLayer(int index, boolean animate) {
         mLabel.setText(mEntries[index]);
         mSmaller.setEnabled(index > 0);
         mLarger.setEnabled(index < mEntries.length - 1);
         setPagerIndicatorContentDescription(mPreviewPager.getCurrentItem());
         mPreviewPagerAdapter.setPreviewLayer(index, mCurrentIndex,
                 mPreviewPager.getCurrentItem(), animate);

         mCurrentIndex = index;
     }

     private void setPagerIndicatorContentDescription(int position) {
         mPageIndicator.setContentDescription(
                 getString(R.string.preview_page_indicator_content_description,
                         position + 1, getPreviewSampleResIds().length));
     }

     private OnPageChangeListener mPreviewPageChangeListener = new OnPageChangeListener() {
         @Override
         public void onPageScrollStateChanged(int state) {
             // Do nothing.
         }

         @Override
         public void onPageScrolled(int position, float positionOffset,
                 int positionOffsetPixels) {
             // Do nothing.
         }

         @Override
         public void onPageSelected(int position) {
             mPreviewPager.sendAccessibilityEvent(AccessibilityEvent.TYPE_ANNOUNCEMENT);
         }
     };

     private OnPageChangeListener mPageIndicatorPageChangeListener = new OnPageChangeListener() {
         @Override
         public void onPageScrollStateChanged(int state) {
             // Do nothing.
         }

         @Override
         public void onPageScrolled(int position, float positionOffset,
                 int positionOffsetPixels) {
             // Do nothing.
         }

         @Override
         public void onPageSelected(int position) {
             setPagerIndicatorContentDescription(position);
         }
     };
 }
	/*
	* Copyright (C) 2018 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.settings.display;

	import android.content.Context;
	import android.content.res.Configuration;
	import android.os.Bundle;
	import android.os.SystemClock;
	import android.view.Choreographer;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.view.accessibility.AccessibilityEvent;
	import android.widget.SeekBar;
	import android.widget.SeekBar.OnSeekBarChangeListener;
	import android.widget.TextView;

	import androidx.viewpager.widget.ViewPager;
	import androidx.viewpager.widget.ViewPager.OnPageChangeListener;

	import com.android.settings.R;
	import com.android.settings.SettingsPreferenceFragment;
	import com.android.settings.widget.DotsPageIndicator;
	import com.android.settings.widget.LabeledSeekBar;

	/**
	* Preference fragment shows a preview and a seek bar to adjust a specific settings.
	*/
	public abstract class PreviewSeekBarPreferenceFragment extends SettingsPreferenceFragment {

	/** List of entries corresponding the settings being set. */
	protected String[] mEntries;

	/** Index of the entry corresponding to initial value of the settings. */
	protected int mInitialIndex;

	/** Index of the entry corresponding to current value of the settings. */
	protected int mCurrentIndex;

	private ViewPager mPreviewPager;
	private PreviewPagerAdapter mPreviewPagerAdapter;
	private DotsPageIndicator mPageIndicator;

	private TextView mLabel;
	private LabeledSeekBar mSeekBar;
	private View mLarger;
	private View mSmaller;

	private static final long MIN_COMMIT_INTERVAL_MS = 800;
	private long mLastCommitTime;

	private class onPreviewSeekBarChangeListener implements OnSeekBarChangeListener {
	private static final long CHANGE_BY_SEEKBAR_DELAY_MS = 100;
	private static final long CHANGE_BY_BUTTON_DELAY_MS = 300;

	private boolean mSeekByTouch;
	private boolean mIsChanged;
	private long mCommitDelayMs;

	private final Choreographer.FrameCallback mCommit = f -> {
	commit();
	mLastCommitTime = SystemClock.elapsedRealtime();
	};

	@Override
	public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
	if (mCurrentIndex == progress) {
	mIsChanged = false;
	return;
	}
	mIsChanged = true;
	setPreviewLayer(progress, false);
	if (mSeekByTouch) {
	mCommitDelayMs = CHANGE_BY_SEEKBAR_DELAY_MS;
	} else {
	mCommitDelayMs = CHANGE_BY_BUTTON_DELAY_MS;
	commitOnNextFrame();
	}
	}

	@Override
	public void onStartTrackingTouch(SeekBar seekBar) {
	mSeekByTouch = true;
	}

	@Override
	public void onStopTrackingTouch(SeekBar seekBar) {
	mSeekByTouch = false;
	if (!mIsChanged) {
	return;
	}
	if (mPreviewPagerAdapter.isAnimating()) {
	mPreviewPagerAdapter.setAnimationEndAction(this::commitOnNextFrame);
	} else {
	commitOnNextFrame();
	}
	}

	private void commitOnNextFrame() {
	if (SystemClock.elapsedRealtime() - mLastCommitTime < MIN_COMMIT_INTERVAL_MS) {
	mCommitDelayMs += MIN_COMMIT_INTERVAL_MS;
	}
	final Choreographer choreographer = Choreographer.getInstance();
	choreographer.removeFrameCallback(mCommit);
	choreographer.postFrameCallbackDelayed(mCommit, mCommitDelayMs);
	}
	}

	@Override
	public void onSaveInstanceState(Bundle outState) {
	super.onSaveInstanceState(outState);
	outState.putLong("mLastCommitTime", mLastCommitTime);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
	Bundle savedInstanceState) {
	if (savedInstanceState != null) {
	mLastCommitTime = savedInstanceState.getLong("mLastCommitTime");
	}
	final View root = super.onCreateView(inflater, container, savedInstanceState);
	final ViewGroup listContainer = root.findViewById(android.R.id.list_container);
	listContainer.removeAllViews();

	final View content = inflater.inflate(getActivityLayoutResId(), listContainer, false);
	listContainer.addView(content);

	mLabel = content.findViewById(R.id.current_label);

	// The maximum SeekBar value always needs to be non-zero. If there's
	// only one available value, we'll handle this by disabling the
	// seek bar.
	final int max = Math.max(1, mEntries.length - 1);

	mSeekBar = content.findViewById(R.id.seek_bar);
	mSeekBar.setLabels(mEntries);
	mSeekBar.setMax(max);

	mSmaller = content.findViewById(R.id.smaller);
	mSmaller.setOnClickListener(v -> {
	final int progress = mSeekBar.getProgress();
	if (progress > 0) {
	mSeekBar.setProgress(progress - 1, true);
	}
	});

	mLarger = content.findViewById(R.id.larger);
	mLarger.setOnClickListener(v -> {
	final int progress = mSeekBar.getProgress();
	if (progress < mSeekBar.getMax()) {
	mSeekBar.setProgress(progress + 1, true);
	}
	});

	if (mEntries.length == 1) {
	// The larger and smaller buttons will be disabled when we call
	// setPreviewLayer() later in this method.
	mSeekBar.setEnabled(false);
	}

	final Context context = getContext();
	final Configuration origConfig = context.getResources().getConfiguration();
	final boolean isLayoutRtl = origConfig.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL;
	Configuration[] configurations = new Configuration[mEntries.length];
	for (int i = 0; i < mEntries.length; ++i) {
	configurations[i] = createConfig(origConfig, i);
	}

	final int[] previews = getPreviewSampleResIds();
	mPreviewPager = content.findViewById(R.id.preview_pager);
	mPreviewPagerAdapter = new PreviewPagerAdapter(context, isLayoutRtl,
	previews, configurations);
	mPreviewPager.setAdapter(mPreviewPagerAdapter);
	mPreviewPager.setCurrentItem(isLayoutRtl ? previews.length - 1 : 0);
	mPreviewPager.addOnPageChangeListener(mPreviewPageChangeListener);

	mPageIndicator = content.findViewById(R.id.page_indicator);
	if (previews.length > 1) {
	mPageIndicator.setViewPager(mPreviewPager);
	mPageIndicator.setVisibility(View.VISIBLE);
	mPageIndicator.setOnPageChangeListener(mPageIndicatorPageChangeListener);
	} else {
	mPageIndicator.setVisibility(View.GONE);
	}

	setPreviewLayer(mInitialIndex, false);
	return root;
	}

	@Override
	public void onStart() {
	super.onStart();
	// Set SeekBar listener here to avoid onProgressChanged() is called
	// during onRestoreInstanceState().
	mSeekBar.setProgress(mCurrentIndex);
	mSeekBar.setOnSeekBarChangeListener(new onPreviewSeekBarChangeListener());
	}

	@Override
	public void onStop() {
	super.onStop();
	mSeekBar.setOnSeekBarChangeListener(null);
	}

	/** Resource id of the layout for this preference fragment. */
	protected abstract int getActivityLayoutResId();

	/** Resource id of the layout that defines the contents inside preview screen. */
	protected abstract int[] getPreviewSampleResIds();

	/**
	* Creates new configuration based on the current position of the SeekBar.
	*/
	protected abstract Configuration createConfig(Configuration origConfig, int index);

	/**
	* Persists the selected value and sends a configuration change.
	*/
	protected abstract void commit();

	private void setPreviewLayer(int index, boolean animate) {
	mLabel.setText(mEntries[index]);
	mSmaller.setEnabled(index > 0);
	mLarger.setEnabled(index < mEntries.length - 1);
	setPagerIndicatorContentDescription(mPreviewPager.getCurrentItem());
	mPreviewPagerAdapter.setPreviewLayer(index, mCurrentIndex,
	mPreviewPager.getCurrentItem(), animate);

	mCurrentIndex = index;
	}

	private void setPagerIndicatorContentDescription(int position) {
	mPageIndicator.setContentDescription(
	getString(R.string.preview_page_indicator_content_description,
	position + 1, getPreviewSampleResIds().length));
	}

	private OnPageChangeListener mPreviewPageChangeListener = new OnPageChangeListener() {
	@Override
	public void onPageScrollStateChanged(int state) {
	// Do nothing.
	}

	@Override
	public void onPageScrolled(int position, float positionOffset,
	int positionOffsetPixels) {
	// Do nothing.
	}

	@Override
	public void onPageSelected(int position) {
	mPreviewPager.sendAccessibilityEvent(AccessibilityEvent.TYPE_ANNOUNCEMENT);
	}
	};

	private OnPageChangeListener mPageIndicatorPageChangeListener = new OnPageChangeListener() {
	@Override
	public void onPageScrollStateChanged(int state) {
	// Do nothing.
	}

	@Override
	public void onPageScrolled(int position, float positionOffset,
	int positionOffsetPixels) {
	// Do nothing.
	}

	@Override
	public void onPageSelected(int position) {
	setPagerIndicatorContentDescription(position);
	}
	};
	}