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ReactSlider.java
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ReactSlider.java
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* <p>This source code is licensed under the MIT license found in the LICENSE file in the root
* directory of this source tree.
*/
package com.reactnativecommunity.slider;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.os.Build;
import android.util.AttributeSet;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import androidx.appcompat.widget.AppCompatSeekBar;
import java.net.URL;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import javax.annotation.Nullable;
import com.facebook.react.modules.i18nmanager.I18nUtil;
/**
* Slider that behaves more like the iOS one, for consistency.
*
* <p>On iOS, the value is 0..1. Android SeekBar only supports integer values. For consistency, we
* pretend in JS that the value is 0..1 but set the SeekBar value to 0..100.
*
* <p>Note that the slider is _not_ a controlled component (setValue isn't called during dragging).
*/
public class ReactSlider extends AppCompatSeekBar {
/**
* If step is 0 (unset) we default to this total number of steps. Don't use 100 which leads to
* rounding errors (0.200000000001).
*/
private static int DEFAULT_TOTAL_STEPS = 128;
/**
* We want custom min..max range. Android only supports 0..max range so we implement this
* ourselves.
*/
private double mMinValue = 0;
private double mMaxValue = 0;
/**
* Value sent from JS (setState). Doesn't get updated during drag (slider is not a controlled
* component).
*/
private double mValue = 0;
private boolean isSliding = false;
/** If zero it's determined automatically. */
private double mStep = 0;
private double mStepCalculated = 0;
private String mAccessibilityUnits;
private List<String> mAccessibilityIncrements;
public ReactSlider(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
I18nUtil sharedI18nUtilInstance = I18nUtil.getInstance();
super.setLayoutDirection(sharedI18nUtilInstance.isRTL(context) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR);
disableStateListAnimatorIfNeeded();
}
private void disableStateListAnimatorIfNeeded() {
// We disable the state list animator for Android 6 and 7; this is a hack to prevent T37452851
// and https://github.com/facebook/react-native/issues/9979
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
&& Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
super.setStateListAnimator(null);
}
}
/* package */ void setMaxValue(double max) {
mMaxValue = max;
updateAll();
}
/* package */ void setMinValue(double min) {
mMinValue = min;
updateAll();
}
/* package */ void setValue(double value) {
mValue = value;
updateValue();
}
/* package */ void setStep(double step) {
mStep = step;
updateAll();
}
boolean isSliding() {
return isSliding;
}
void isSliding(boolean isSliding) {
this.isSliding = isSliding;
}
void setAccessibilityUnits(String accessibilityUnits) {
mAccessibilityUnits = accessibilityUnits;
}
void setAccessibilityIncrements(List<String> accessibilityIncrements) {
mAccessibilityIncrements = accessibilityIncrements;
}
@Override
public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
super.onPopulateAccessibilityEvent(event);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED ||
(event.getEventType() == AccessibilityEvent.TYPE_VIEW_SELECTED && this.isAccessibilityFocused())) {
this.setupAccessibility((int)mValue);
}
}
}
@Override
public void announceForAccessibility(CharSequence text) {
Context ctx = this.getContext();
final AccessibilityManager manager = (AccessibilityManager) ctx.getSystemService(Context.ACCESSIBILITY_SERVICE);
if (manager.isEnabled()) {
final AccessibilityEvent e = AccessibilityEvent.obtain();
e.setEventType(AccessibilityEvent.TYPE_ANNOUNCEMENT);
e.setClassName(this.getClass().getName());
e.setPackageName(ctx.getPackageName());
e.getText().add(text);
TimerTask task = new TimerTask() {
@Override
public void run() {
manager.sendAccessibilityEvent(e);
}
};
Timer timer = new Timer();
timer.schedule(task, 1000);
}
}
public void setupAccessibility(int index) {
if (mAccessibilityUnits != null && mAccessibilityIncrements != null && mAccessibilityIncrements.size() - 1 == (int)mMaxValue) {
String sliderValue = mAccessibilityIncrements.get(index);
int stringLength = mAccessibilityUnits.length();
String spokenUnits = mAccessibilityUnits;
if (sliderValue != null && Integer.parseInt(sliderValue) == 1) {
spokenUnits = spokenUnits.substring(0, stringLength - 1);
}
this.announceForAccessibility(String.format("%s %s", sliderValue, spokenUnits));
}
}
/**
* Convert SeekBar's native progress value (e.g. 0..100) to a value passed to JS (e.g. -1.0..2.5).
*/
public double toRealProgress(int seekBarProgress) {
if (seekBarProgress == getMax()) {
return mMaxValue;
}
return seekBarProgress * getStepValue() + mMinValue;
}
/** Update underlying native SeekBar's values. */
private void updateAll() {
if (mStep == 0) {
mStepCalculated = (mMaxValue - mMinValue) / (double) DEFAULT_TOTAL_STEPS;
}
setMax(getTotalSteps());
updateValue();
}
/** Update value only (optimization in case only value is set). */
private void updateValue() {
setProgress((int) Math.round((mValue - mMinValue) / (mMaxValue - mMinValue) * getTotalSteps()));
}
private int getTotalSteps() {
return (int) Math.ceil((mMaxValue - mMinValue) / getStepValue());
}
private double getStepValue() {
return mStep > 0 ? mStep : mStepCalculated;
}
private BitmapDrawable getBitmapDrawable(final String uri) {
BitmapDrawable bitmapDrawable = null;
ExecutorService executorService = Executors.newSingleThreadExecutor();
Future<BitmapDrawable> future = executorService.submit(new Callable<BitmapDrawable>() {
@Override
public BitmapDrawable call() {
BitmapDrawable bitmapDrawable = null;
try {
Bitmap bitmap = null;
if (uri.startsWith("http://") || uri.startsWith("https://") ||
uri.startsWith("file://") || uri.startsWith("asset://") || uri.startsWith("data:")) {
bitmap = BitmapFactory.decodeStream(new URL(uri).openStream());
} else {
int drawableId = getResources()
.getIdentifier(uri, "drawable", getContext()
.getPackageName());
bitmap = BitmapFactory.decodeResource(getResources(), drawableId);
}
bitmapDrawable = new BitmapDrawable(getResources(), bitmap);
} catch (Exception e) {
e.printStackTrace();
}
return bitmapDrawable;
}
});
try {
bitmapDrawable = future.get();
} catch (Exception e) {
e.printStackTrace();
}
return bitmapDrawable;
}
public void setThumbImage(final String uri) {
if (uri != null) {
setThumb(getBitmapDrawable(uri));
// Enable alpha channel for the thumbImage
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
setSplitTrack(false);
}
} else {
setThumb(getThumb());
}
}
}