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package org.wordpress.android.ui;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
import android.widget.EditText;
import android.widget.NumberPicker;
import android.widget.TextView;
import org.wordpress.android.R;
import org.wordpress.android.util.WPPrefUtils;
import java.lang.reflect.Field;
public class WPNumberPicker extends NumberPicker {
private static final String DIVIDER_FIELD = "mSelectionDivider";
private static final String INPUT_FIELD = "mInputText";
private static final String INDICES_FIELD = "mSelectorIndices";
private static final String CUR_OFFSET_FIELD = "mCurrentScrollOffset";
private static final String SELECTOR_HEIGHT_FIELD = "mSelectorElementHeight";
private static final String INITIAL_OFFSET_FIELD = "mInitialScrollOffset";
private static final String CURRENT_OFFSET_FIELD = "mCurrentScrollOffset";
private static final String PAINT_FIELD = "mSelectorWheelPaint";
private static final int DISPLAY_COUNT = 5;
private static final int MIDDLE_INDEX = 2;
private Field mOffsetField;
private Field mSelectorHeight;
private Field mSelectorIndices;
private Field mInitialOffset;
private Field mCurrentOffset;
private EditText mInputView;
private Formatter mFormatter;
private Paint mPaint;
private int[] mDisplayValues;
public WPNumberPicker(Context context, AttributeSet attrs) {
super(context, attrs);
mDisplayValues = new int[DISPLAY_COUNT];
getFieldsViaReflection();
}
@Override
public void addView(View child, int index, android.view.ViewGroup.LayoutParams params) {
super.addView(child, index, params);
if (child instanceof TextView) {
WPPrefUtils.layoutAsNumberPickerPeek((TextView) child);
}
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
updateIntitialOffset();
setVerticalFadingEdgeEnabled(false);
setHorizontalFadingEdgeEnabled(false);
WPPrefUtils.layoutAsNumberPickerSelected(mInputView);
mInputView.setVisibility(View.INVISIBLE);
}
@Override
public void setValue(int value) {
if (value < getMinValue()) value = getMinValue();
if (value > getMaxValue()) value = getMaxValue();
super.setValue(value);
}
@Override
protected void onDraw(Canvas canvas) {
int[] selectorIndices = getIndices();
setIndices(new int[0]);
setIndices(selectorIndices);
// Draw the middle number with a different font
setDisplayValues();
float elementHeight = getSelectorElementHeight();
float x = ((getRight() - getLeft()) / 2.0f);
float y = getScrollOffset();
Paint paint = mInputView.getPaint();
paint.setTextAlign(Paint.Align.CENTER);
//noinspection deprecation
paint.setColor(getResources().getColor(R.color.blue_medium));
int alpha = isEnabled() ? 255 : 96;
paint.setAlpha(alpha);
mPaint.setAlpha(alpha);
int offset = getResources().getDimensionPixelSize(R.dimen.margin_medium);
// Draw the visible values
for (int i = 0; i < DISPLAY_COUNT; ++i) {
String scrollSelectorValue;
if (mFormatter != null) {
scrollSelectorValue = mFormatter.format(mDisplayValues[i]);
} else {
scrollSelectorValue = String.valueOf(mDisplayValues[i]);
}
if (i == MIDDLE_INDEX) {
canvas.drawText(scrollSelectorValue, x, y - ((paint.descent() + paint.ascent()) / 2) - offset, paint);
} else {
canvas.drawText(scrollSelectorValue, x, y - ((mPaint.descent() + mPaint.ascent()) / 2) - offset, mPaint);
}
y += elementHeight;
}
}
@Override
public void setFormatter(Formatter formatter) {
super.setFormatter(formatter);
mFormatter = formatter;
}
private void setDisplayValues() {
int value = getValue();
for (int i = 0; i < DISPLAY_COUNT; ++i) {
mDisplayValues[i] = value - MIDDLE_INDEX + i;
if (mDisplayValues[i] < getMinValue()) {
mDisplayValues[i] = getMaxValue() + (mDisplayValues[i] + 1 - getMinValue());
} else if (mDisplayValues[i] > getMaxValue()) {
mDisplayValues[i] = getMinValue() + (mDisplayValues[i] - getMaxValue() - 1);
}
}
}
private void setIndices(int[] indices) {
if (mSelectorIndices != null) {
try {
mSelectorIndices.set(this, indices);
} catch (IllegalArgumentException | IllegalAccessException e) {
e.printStackTrace();
}
}
}
private int[] getIndices() {
if (mSelectorIndices != null) {
try {
return (int[]) mSelectorIndices.get(this);
} catch (IllegalArgumentException | IllegalAccessException e) {
e.printStackTrace();
}
}
return null;
}
private int getScrollOffset() {
if (mOffsetField != null) {
try {
return (Integer) mOffsetField.get(this);
} catch (IllegalArgumentException | IllegalAccessException e) {
e.printStackTrace();
}
}
return 0;
}
private int getSelectorElementHeight() {
if (mSelectorHeight != null) {
try {
return (Integer) mSelectorHeight.get(this);
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
return 0;
}
private void updateIntitialOffset() {
if (mInitialOffset != null) {
try {
int offset = (Integer) mInitialOffset.get(this) - getSelectorElementHeight();
mInitialOffset.set(this, offset);
// Only do this once
mInitialOffset = null;
if (mCurrentOffset != null) {
mCurrentOffset.set(this, offset);
}
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
}
/**
* From https://www.snip2code.com/Snippet/67740/NumberPicker-with-transparent-selection-
*/
private void removeDividers(Class<?> clazz) {
Field selectionDivider = getFieldAndSetAccessible(clazz, DIVIDER_FIELD);
if (selectionDivider != null) {
try {
selectionDivider.set(this, null);
} catch (IllegalArgumentException | IllegalAccessException e) {
e.printStackTrace();
}
}
}
private void getTextPaint(Class<?> clazz) {
Field paint = getFieldAndSetAccessible(clazz, PAINT_FIELD);
if (paint != null) {
try {
mPaint = (Paint) paint.get(this);
} catch (IllegalArgumentException | IllegalAccessException e) {
e.printStackTrace();
}
}
}
private void getInputField(Class<?> clazz) {
Field inputField = getFieldAndSetAccessible(clazz, INPUT_FIELD);
if (inputField != null) {
try {
mInputView = ((EditText) inputField.get(this));
} catch (IllegalArgumentException | IllegalAccessException e) {
e.printStackTrace();
}
}
}
/**
* Gets a class field using reflection and makes it accessible.
*/
private Field getFieldAndSetAccessible(Class<?> clazz, String fieldName) {
Field field = null;
try {
field = clazz.getDeclaredField(fieldName);
field.setAccessible(true);
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
return field;
}
private void getFieldsViaReflection() {
Class<?> numberPickerClass = null;
try {
numberPickerClass = Class.forName(NumberPicker.class.getName());
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
if (numberPickerClass == null) return;
mSelectorHeight = getFieldAndSetAccessible(numberPickerClass, SELECTOR_HEIGHT_FIELD);
mOffsetField = getFieldAndSetAccessible(numberPickerClass, CUR_OFFSET_FIELD);
mSelectorIndices = getFieldAndSetAccessible(numberPickerClass, INDICES_FIELD);
mInitialOffset = getFieldAndSetAccessible(numberPickerClass, INITIAL_OFFSET_FIELD);
mCurrentOffset = getFieldAndSetAccessible(numberPickerClass, CURRENT_OFFSET_FIELD);
getTextPaint(numberPickerClass);
getInputField(numberPickerClass);
removeDividers(numberPickerClass);
setIndices(new int[DISPLAY_COUNT]);
}
}
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