src/com/android/settings/widget/SeekBarPreference.java - platform/packages/apps/Settings - Git at Google

 /*
  * Copyright (C) 2011 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.widget;

 import android.content.Context;
 import android.content.res.TypedArray;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.view.KeyEvent;
 import android.view.View;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.widget.SeekBar;
 import android.widget.SeekBar.OnSeekBarChangeListener;

 import androidx.core.content.res.TypedArrayUtils;
 import androidx.preference.PreferenceViewHolder;

 import com.android.settingslib.RestrictedPreference;

 /**
  * Based on android.preference.SeekBarPreference, but uses support preference as base.
  */
 public class SeekBarPreference extends RestrictedPreference
         implements OnSeekBarChangeListener, View.OnKeyListener {

     private int mProgress;
     private int mMax;
     private int mMin;
     private boolean mTrackingTouch;

     private boolean mContinuousUpdates;
     private int mDefaultProgress = -1;

     private SeekBar mSeekBar;
     private boolean mShouldBlink;
     private int mAccessibilityRangeInfoType = AccessibilityNodeInfo.RangeInfo.RANGE_TYPE_INT;
     private CharSequence mSeekBarContentDescription;
     private CharSequence mSeekBarStateDescription;

     public SeekBarPreference(
             Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
         super(context, attrs, defStyleAttr, defStyleRes);

         TypedArray a = context.obtainStyledAttributes(
                 attrs, com.android.internal.R.styleable.ProgressBar, defStyleAttr, defStyleRes);
         setMax(a.getInt(com.android.internal.R.styleable.ProgressBar_max, mMax));
         setMin(a.getInt(com.android.internal.R.styleable.ProgressBar_min, mMin));
         a.recycle();

         a = context.obtainStyledAttributes(attrs,
                 com.android.internal.R.styleable.SeekBarPreference, defStyleAttr, defStyleRes);
         final int layoutResId = a.getResourceId(
                 com.android.internal.R.styleable.SeekBarPreference_layout,
                 com.android.internal.R.layout.preference_widget_seekbar);
         a.recycle();

         a = context.obtainStyledAttributes(
                 attrs, com.android.internal.R.styleable.Preference, defStyleAttr, defStyleRes);
         final boolean isSelectable = a.getBoolean(
                 com.android.settings.R.styleable.Preference_android_selectable, false);
         setSelectable(isSelectable);
         a.recycle();

         setLayoutResource(layoutResId);
     }

     public SeekBarPreference(Context context, AttributeSet attrs, int defStyleAttr) {
         this(context, attrs, defStyleAttr, 0);
     }

     public SeekBarPreference(Context context, AttributeSet attrs) {
         this(context, attrs, TypedArrayUtils.getAttr(context,
                         androidx.preference.R.attr.seekBarPreferenceStyle,
                         com.android.internal.R.attr.seekBarPreferenceStyle));
     }

     public SeekBarPreference(Context context) {
         this(context, null);
     }

     public void setShouldBlink(boolean shouldBlink) {
         mShouldBlink = shouldBlink;
         notifyChanged();
     }

     @Override
     public boolean isSelectable() {
         if(isDisabledByAdmin()) {
             return true;
         } else {
             return super.isSelectable();
         }
     }

     @Override
     public void onBindViewHolder(PreferenceViewHolder view) {
         super.onBindViewHolder(view);
         view.itemView.setOnKeyListener(this);
         mSeekBar = (SeekBar) view.findViewById(
                 com.android.internal.R.id.seekbar);
         mSeekBar.setOnSeekBarChangeListener(this);
         mSeekBar.setMax(mMax);
         mSeekBar.setMin(mMin);
         mSeekBar.setProgress(mProgress);
         mSeekBar.setEnabled(isEnabled());
         final CharSequence title = getTitle();
         if (!TextUtils.isEmpty(mSeekBarContentDescription)) {
             mSeekBar.setContentDescription(mSeekBarContentDescription);
         } else if (!TextUtils.isEmpty(title)) {
             mSeekBar.setContentDescription(title);
         }
         if (!TextUtils.isEmpty(mSeekBarStateDescription)) {
             mSeekBar.setStateDescription(mSeekBarStateDescription);
         }
         if (mSeekBar instanceof DefaultIndicatorSeekBar) {
             ((DefaultIndicatorSeekBar) mSeekBar).setDefaultProgress(mDefaultProgress);
         }
         if (mShouldBlink) {
             View v = view.itemView;
             v.post(() -> {
                 if (v.getBackground() != null) {
                     final int centerX = v.getWidth() / 2;
                     final int centerY = v.getHeight() / 2;
                     v.getBackground().setHotspot(centerX, centerY);
                 }
                 v.setPressed(true);
                 v.setPressed(false);
                 mShouldBlink = false;
             });
         }
         mSeekBar.setAccessibilityDelegate(new View.AccessibilityDelegate() {
             @Override
             public void onInitializeAccessibilityNodeInfo(View view, AccessibilityNodeInfo info) {
                 super.onInitializeAccessibilityNodeInfo(view, info);
                 // Update the range info with the correct type
                 AccessibilityNodeInfo.RangeInfo rangeInfo = info.getRangeInfo();
                 if (rangeInfo != null) {
                     info.setRangeInfo(AccessibilityNodeInfo.RangeInfo.obtain(
                                     mAccessibilityRangeInfoType, rangeInfo.getMin(),
                                     rangeInfo.getMax(), rangeInfo.getCurrent()));
                 }
             }
         });
     }

     @Override
     public CharSequence getSummary() {
         return null;
     }

     @Override
     protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
         setProgress(restoreValue ? getPersistedInt(mProgress)
                 : (Integer) defaultValue);
     }

     @Override
     protected Object onGetDefaultValue(TypedArray a, int index) {
         return a.getInt(index, 0);
     }

     @Override
     public boolean onKey(View v, int keyCode, KeyEvent event) {
         if (event.getAction() != KeyEvent.ACTION_DOWN) {
             return false;
         }

         SeekBar seekBar = (SeekBar) v.findViewById(com.android.internal.R.id.seekbar);
         if (seekBar == null) {
             return false;
         }
         return seekBar.onKeyDown(keyCode, event);
     }

     public void setMax(int max) {
         if (max != mMax) {
             mMax = max;
             notifyChanged();
         }
     }

     public void setMin(int min) {
         if (min != mMin) {
             mMin = min;
             notifyChanged();
         }
     }

     public int getMax() {
         return mMax;
     }

     public int getMin() {
         return mMin;
     }

     public void setProgress(int progress) {
         setProgress(progress, true);
     }

     /**
      * Sets the progress point to draw a single tick mark representing a default value.
      */
     public void setDefaultProgress(int defaultProgress) {
         if (mDefaultProgress != defaultProgress) {
             mDefaultProgress = defaultProgress;
             if (mSeekBar instanceof DefaultIndicatorSeekBar) {
                 ((DefaultIndicatorSeekBar) mSeekBar).setDefaultProgress(mDefaultProgress);
             }
         }
     }

     /**
      * When {@code continuousUpdates} is true, update the persisted setting immediately as the thumb
      * is dragged along the SeekBar. Otherwise, only update the value of the setting when the thumb
      * is dropped.
      */
     public void setContinuousUpdates(boolean continuousUpdates) {
         mContinuousUpdates = continuousUpdates;
     }

     private void setProgress(int progress, boolean notifyChanged) {
         if (progress > mMax) {
             progress = mMax;
         }
         if (progress < mMin) {
             progress = mMin;
         }
         if (progress != mProgress) {
             mProgress = progress;
             persistInt(progress);
             if (notifyChanged) {
                 notifyChanged();
             }
         }
     }

     public int getProgress() {
         return mProgress;
     }

     /**
      * Persist the seekBar's progress value if callChangeListener
      * returns true, otherwise set the seekBar's progress to the stored value
      */
     void syncProgress(SeekBar seekBar) {
         int progress = seekBar.getProgress();
         if (progress != mProgress) {
             if (callChangeListener(progress)) {
                 setProgress(progress, false);
             } else {
                 seekBar.setProgress(mProgress);
             }
         }
     }

     @Override
     public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
         if (fromUser && (mContinuousUpdates || !mTrackingTouch)) {
             syncProgress(seekBar);
         }
     }

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

     @Override
     public void onStopTrackingTouch(SeekBar seekBar) {
         mTrackingTouch = false;
         if (seekBar.getProgress() != mProgress) {
             syncProgress(seekBar);
         }
     }

     /**
      * Specify the type of range this seek bar represents.
      *
      * @param rangeInfoType The type of range to be shared with accessibility
      *
      * @see android.view.accessibility.AccessibilityNodeInfo.RangeInfo
      */
     public void setAccessibilityRangeInfoType(int rangeInfoType) {
         mAccessibilityRangeInfoType = rangeInfoType;
     }

     public void setSeekBarContentDescription(CharSequence contentDescription) {
         mSeekBarContentDescription = contentDescription;
         if (mSeekBar != null) {
             mSeekBar.setContentDescription(contentDescription);
         }
     }

     /**
      * Specify the state description for this seek bar represents.
      *
      * @param stateDescription the state description of seek bar
      */
     public void setSeekBarStateDescription(CharSequence stateDescription) {
         mSeekBarStateDescription = stateDescription;
         if (mSeekBar != null) {
             mSeekBar.setStateDescription(stateDescription);
         }
     }

     @Override
     protected Parcelable onSaveInstanceState() {
         /*
          * Suppose a client uses this preference type without persisting. We
          * must save the instance state so it is able to, for example, survive
          * orientation changes.
          */

         final Parcelable superState = super.onSaveInstanceState();
         if (isPersistent()) {
             // No need to save instance state since it's persistent
             return superState;
         }

         // Save the instance state
         final SavedState myState = new SavedState(superState);
         myState.progress = mProgress;
         myState.max = mMax;
         myState.min = mMin;
         return myState;
     }

     @Override
     protected void onRestoreInstanceState(Parcelable state) {
         if (!state.getClass().equals(SavedState.class)) {
             // Didn't save state for us in onSaveInstanceState
             super.onRestoreInstanceState(state);
             return;
         }

         // Restore the instance state
         SavedState myState = (SavedState) state;
         super.onRestoreInstanceState(myState.getSuperState());
         mProgress = myState.progress;
         mMax = myState.max;
         mMin = myState.min;
         notifyChanged();
     }

     /**
      * SavedState, a subclass of {@link BaseSavedState}, will store the state
      * of MyPreference, a subclass of Preference.
      * <p>
      * It is important to always call through to super methods.
      */
     private static class SavedState extends BaseSavedState {
         int progress;
         int max;
         int min;

         public SavedState(Parcel source) {
             super(source);

             // Restore the click counter
             progress = source.readInt();
             max = source.readInt();
             min = source.readInt();
         }

         @Override
         public void writeToParcel(Parcel dest, int flags) {
             super.writeToParcel(dest, flags);

             // Save the click counter
             dest.writeInt(progress);
             dest.writeInt(max);
             dest.writeInt(min);
         }

         public SavedState(Parcelable superState) {
             super(superState);
         }

         @SuppressWarnings("unused")
         public static final Parcelable.Creator<SavedState> CREATOR =
                 new Parcelable.Creator<SavedState>() {
             public SavedState createFromParcel(Parcel in) {
                 return new SavedState(in);
             }

             public SavedState[] newArray(int size) {
                 return new SavedState[size];
             }
         };
     }
 }
	/*
	* Copyright (C) 2011 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.widget;

	import android.content.Context;
	import android.content.res.TypedArray;
	import android.os.Parcel;
	import android.os.Parcelable;
	import android.text.TextUtils;
	import android.util.AttributeSet;
	import android.view.KeyEvent;
	import android.view.View;
	import android.view.accessibility.AccessibilityNodeInfo;
	import android.widget.SeekBar;
	import android.widget.SeekBar.OnSeekBarChangeListener;

	import androidx.core.content.res.TypedArrayUtils;
	import androidx.preference.PreferenceViewHolder;

	import com.android.settingslib.RestrictedPreference;

	/**
	* Based on android.preference.SeekBarPreference, but uses support preference as base.
	*/
	public class SeekBarPreference extends RestrictedPreference
	implements OnSeekBarChangeListener, View.OnKeyListener {

	private int mProgress;
	private int mMax;
	private int mMin;
	private boolean mTrackingTouch;

	private boolean mContinuousUpdates;
	private int mDefaultProgress = -1;

	private SeekBar mSeekBar;
	private boolean mShouldBlink;
	private int mAccessibilityRangeInfoType = AccessibilityNodeInfo.RangeInfo.RANGE_TYPE_INT;
	private CharSequence mSeekBarContentDescription;
	private CharSequence mSeekBarStateDescription;

	public SeekBarPreference(
	Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
	super(context, attrs, defStyleAttr, defStyleRes);

	TypedArray a = context.obtainStyledAttributes(
	attrs, com.android.internal.R.styleable.ProgressBar, defStyleAttr, defStyleRes);
	setMax(a.getInt(com.android.internal.R.styleable.ProgressBar_max, mMax));
	setMin(a.getInt(com.android.internal.R.styleable.ProgressBar_min, mMin));
	a.recycle();

	a = context.obtainStyledAttributes(attrs,
	com.android.internal.R.styleable.SeekBarPreference, defStyleAttr, defStyleRes);
	final int layoutResId = a.getResourceId(
	com.android.internal.R.styleable.SeekBarPreference_layout,
	com.android.internal.R.layout.preference_widget_seekbar);
	a.recycle();

	a = context.obtainStyledAttributes(
	attrs, com.android.internal.R.styleable.Preference, defStyleAttr, defStyleRes);
	final boolean isSelectable = a.getBoolean(
	com.android.settings.R.styleable.Preference_android_selectable, false);
	setSelectable(isSelectable);
	a.recycle();

	setLayoutResource(layoutResId);
	}

	public SeekBarPreference(Context context, AttributeSet attrs, int defStyleAttr) {
	this(context, attrs, defStyleAttr, 0);
	}

	public SeekBarPreference(Context context, AttributeSet attrs) {
	this(context, attrs, TypedArrayUtils.getAttr(context,
	androidx.preference.R.attr.seekBarPreferenceStyle,
	com.android.internal.R.attr.seekBarPreferenceStyle));
	}

	public SeekBarPreference(Context context) {
	this(context, null);
	}

	public void setShouldBlink(boolean shouldBlink) {
	mShouldBlink = shouldBlink;
	notifyChanged();
	}

	@Override
	public boolean isSelectable() {
	if(isDisabledByAdmin()) {
	return true;
	} else {
	return super.isSelectable();
	}
	}

	@Override
	public void onBindViewHolder(PreferenceViewHolder view) {
	super.onBindViewHolder(view);
	view.itemView.setOnKeyListener(this);
	mSeekBar = (SeekBar) view.findViewById(
	com.android.internal.R.id.seekbar);
	mSeekBar.setOnSeekBarChangeListener(this);
	mSeekBar.setMax(mMax);
	mSeekBar.setMin(mMin);
	mSeekBar.setProgress(mProgress);
	mSeekBar.setEnabled(isEnabled());
	final CharSequence title = getTitle();
	if (!TextUtils.isEmpty(mSeekBarContentDescription)) {
	mSeekBar.setContentDescription(mSeekBarContentDescription);
	} else if (!TextUtils.isEmpty(title)) {
	mSeekBar.setContentDescription(title);
	}
	if (!TextUtils.isEmpty(mSeekBarStateDescription)) {
	mSeekBar.setStateDescription(mSeekBarStateDescription);
	}
	if (mSeekBar instanceof DefaultIndicatorSeekBar) {
	((DefaultIndicatorSeekBar) mSeekBar).setDefaultProgress(mDefaultProgress);
	}
	if (mShouldBlink) {
	View v = view.itemView;
	v.post(() -> {
	if (v.getBackground() != null) {
	final int centerX = v.getWidth() / 2;
	final int centerY = v.getHeight() / 2;
	v.getBackground().setHotspot(centerX, centerY);
	}
	v.setPressed(true);
	v.setPressed(false);
	mShouldBlink = false;
	});
	}
	mSeekBar.setAccessibilityDelegate(new View.AccessibilityDelegate() {
	@Override
	public void onInitializeAccessibilityNodeInfo(View view, AccessibilityNodeInfo info) {
	super.onInitializeAccessibilityNodeInfo(view, info);
	// Update the range info with the correct type
	AccessibilityNodeInfo.RangeInfo rangeInfo = info.getRangeInfo();
	if (rangeInfo != null) {
	info.setRangeInfo(AccessibilityNodeInfo.RangeInfo.obtain(
	mAccessibilityRangeInfoType, rangeInfo.getMin(),
	rangeInfo.getMax(), rangeInfo.getCurrent()));
	}
	}
	});
	}

	@Override
	public CharSequence getSummary() {
	return null;
	}

	@Override
	protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
	setProgress(restoreValue ? getPersistedInt(mProgress)
	: (Integer) defaultValue);
	}

	@Override
	protected Object onGetDefaultValue(TypedArray a, int index) {
	return a.getInt(index, 0);
	}

	@Override
	public boolean onKey(View v, int keyCode, KeyEvent event) {
	if (event.getAction() != KeyEvent.ACTION_DOWN) {
	return false;
	}

	SeekBar seekBar = (SeekBar) v.findViewById(com.android.internal.R.id.seekbar);
	if (seekBar == null) {
	return false;
	}
	return seekBar.onKeyDown(keyCode, event);
	}

	public void setMax(int max) {
	if (max != mMax) {
	mMax = max;
	notifyChanged();
	}
	}

	public void setMin(int min) {
	if (min != mMin) {
	mMin = min;
	notifyChanged();
	}
	}

	public int getMax() {
	return mMax;
	}

	public int getMin() {
	return mMin;
	}

	public void setProgress(int progress) {
	setProgress(progress, true);
	}

	/**
	* Sets the progress point to draw a single tick mark representing a default value.
	*/
	public void setDefaultProgress(int defaultProgress) {
	if (mDefaultProgress != defaultProgress) {
	mDefaultProgress = defaultProgress;
	if (mSeekBar instanceof DefaultIndicatorSeekBar) {
	((DefaultIndicatorSeekBar) mSeekBar).setDefaultProgress(mDefaultProgress);
	}
	}
	}

	/**
	* When {@code continuousUpdates} is true, update the persisted setting immediately as the thumb
	* is dragged along the SeekBar. Otherwise, only update the value of the setting when the thumb
	* is dropped.
	*/
	public void setContinuousUpdates(boolean continuousUpdates) {
	mContinuousUpdates = continuousUpdates;
	}

	private void setProgress(int progress, boolean notifyChanged) {
	if (progress > mMax) {
	progress = mMax;
	}
	if (progress < mMin) {
	progress = mMin;
	}
	if (progress != mProgress) {
	mProgress = progress;
	persistInt(progress);
	if (notifyChanged) {
	notifyChanged();
	}
	}
	}

	public int getProgress() {
	return mProgress;
	}

	/**
	* Persist the seekBar's progress value if callChangeListener
	* returns true, otherwise set the seekBar's progress to the stored value
	*/
	void syncProgress(SeekBar seekBar) {
	int progress = seekBar.getProgress();
	if (progress != mProgress) {
	if (callChangeListener(progress)) {
	setProgress(progress, false);
	} else {
	seekBar.setProgress(mProgress);
	}
	}
	}

	@Override
	public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
	if (fromUser && (mContinuousUpdates \|\| !mTrackingTouch)) {
	syncProgress(seekBar);
	}
	}

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

	@Override
	public void onStopTrackingTouch(SeekBar seekBar) {
	mTrackingTouch = false;
	if (seekBar.getProgress() != mProgress) {
	syncProgress(seekBar);
	}
	}

	/**
	* Specify the type of range this seek bar represents.
	*
	* @param rangeInfoType The type of range to be shared with accessibility
	*
	* @see android.view.accessibility.AccessibilityNodeInfo.RangeInfo
	*/
	public void setAccessibilityRangeInfoType(int rangeInfoType) {
	mAccessibilityRangeInfoType = rangeInfoType;
	}

	public void setSeekBarContentDescription(CharSequence contentDescription) {
	mSeekBarContentDescription = contentDescription;
	if (mSeekBar != null) {
	mSeekBar.setContentDescription(contentDescription);
	}
	}

	/**
	* Specify the state description for this seek bar represents.
	*
	* @param stateDescription the state description of seek bar
	*/
	public void setSeekBarStateDescription(CharSequence stateDescription) {
	mSeekBarStateDescription = stateDescription;
	if (mSeekBar != null) {
	mSeekBar.setStateDescription(stateDescription);
	}
	}

	@Override
	protected Parcelable onSaveInstanceState() {
	/*
	* Suppose a client uses this preference type without persisting. We
	* must save the instance state so it is able to, for example, survive
	* orientation changes.
	*/

	final Parcelable superState = super.onSaveInstanceState();
	if (isPersistent()) {
	// No need to save instance state since it's persistent
	return superState;
	}

	// Save the instance state
	final SavedState myState = new SavedState(superState);
	myState.progress = mProgress;
	myState.max = mMax;
	myState.min = mMin;
	return myState;
	}

	@Override
	protected void onRestoreInstanceState(Parcelable state) {
	if (!state.getClass().equals(SavedState.class)) {
	// Didn't save state for us in onSaveInstanceState
	super.onRestoreInstanceState(state);
	return;
	}

	// Restore the instance state
	SavedState myState = (SavedState) state;
	super.onRestoreInstanceState(myState.getSuperState());
	mProgress = myState.progress;
	mMax = myState.max;
	mMin = myState.min;
	notifyChanged();
	}

	/**
	* SavedState, a subclass of {@link BaseSavedState}, will store the state
	* of MyPreference, a subclass of Preference.
	* <p>
	* It is important to always call through to super methods.
	*/
	private static class SavedState extends BaseSavedState {
	int progress;
	int max;
	int min;

	public SavedState(Parcel source) {
	super(source);

	// Restore the click counter
	progress = source.readInt();
	max = source.readInt();
	min = source.readInt();
	}

	@Override
	public void writeToParcel(Parcel dest, int flags) {
	super.writeToParcel(dest, flags);

	// Save the click counter
	dest.writeInt(progress);
	dest.writeInt(max);
	dest.writeInt(min);
	}

	public SavedState(Parcelable superState) {
	super(superState);
	}

	@SuppressWarnings("unused")
	public static final Parcelable.Creator<SavedState> CREATOR =
	new Parcelable.Creator<SavedState>() {
	public SavedState createFromParcel(Parcel in) {
	return new SavedState(in);
	}

	public SavedState[] newArray(int size) {
	return new SavedState[size];
	}
	};
	}
	}