DigitsKeyListenerWithComma -> kt
This commit is contained in:
Milos Kozak
parent
75a9083abd
commit
588c21fcfd
2 changed files with 145 additions and 197 deletions
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package info.nightscout.core.ui.elements;
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import android.text.InputType;
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import android.text.SpannableStringBuilder;
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import android.text.Spanned;
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import android.text.method.NumberKeyListener;
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import android.view.KeyEvent;
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import androidx.annotation.NonNull;
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class DigitsKeyListenerWithComma extends NumberKeyListener {
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/**
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* The characters that are used.
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*
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* @see KeyEvent#getMatch
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* @see #getAcceptedChars
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*/
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private static final char[][] CHARACTERS = new char[][]{
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new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'},
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new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-'},
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new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.', ','},
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new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '.', ','},
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};
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private char[] mAccepted;
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private final boolean mSign;
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private final boolean mDecimal;
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private static final int SIGN = 1;
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private static final int DECIMAL = 2;
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private static final DigitsKeyListenerWithComma[] sInstance = new DigitsKeyListenerWithComma[4];
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@Override @NonNull
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protected char[] getAcceptedChars() {
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return mAccepted;
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}
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/**
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* Allocates a DigitsKeyListener that accepts the digits 0 through 9.
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*/
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public DigitsKeyListenerWithComma() {
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this(false, false);
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}
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/**
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* Allocates a DigitsKeyListener that accepts the digits 0 through 9,
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* plus the minus sign (only at the beginning) and/or decimal point
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* (only one per field) if specified.
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*/
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public DigitsKeyListenerWithComma(boolean sign, boolean decimal) {
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mSign = sign;
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mDecimal = decimal;
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int kind = (sign ? SIGN : 0) | (decimal ? DECIMAL : 0);
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mAccepted = CHARACTERS[kind];
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}
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/**
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* Returns a DigitsKeyListener that accepts the digits 0 through 9.
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*/
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public static DigitsKeyListenerWithComma getInstance() {
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return getInstance(false, false);
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}
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/**
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* Returns a DigitsKeyListener that accepts the digits 0 through 9,
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* plus the minus sign (only at the beginning) and/or decimal point
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* (only one per field) if specified.
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*/
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public static DigitsKeyListenerWithComma getInstance(boolean sign, boolean decimal) {
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int kind = (sign ? SIGN : 0) | (decimal ? DECIMAL : 0);
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if (sInstance[kind] != null)
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return sInstance[kind];
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sInstance[kind] = new DigitsKeyListenerWithComma(sign, decimal);
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return sInstance[kind];
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}
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/**
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* Returns a DigitsKeyListener that accepts only the characters
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* that appear in the specified String. Note that not all characters
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* may be available on every keyboard.
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*/
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public static DigitsKeyListenerWithComma getInstance(String accepted) {
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// TODO: do we need a cache of these to avoid allocating?
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DigitsKeyListenerWithComma dim = new DigitsKeyListenerWithComma();
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dim.mAccepted = new char[accepted.length()];
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accepted.getChars(0, accepted.length(), dim.mAccepted, 0);
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return dim;
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}
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public int getInputType() {
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int contentType = InputType.TYPE_CLASS_NUMBER;
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if (mSign) {
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contentType |= InputType.TYPE_NUMBER_FLAG_SIGNED;
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}
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if (mDecimal) {
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contentType |= InputType.TYPE_NUMBER_FLAG_DECIMAL;
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}
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return contentType;
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}
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@Override
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public CharSequence filter(CharSequence source, int start, int end,
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Spanned dest, int dstart, int dend) {
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CharSequence out = super.filter(source, start, end, dest, dstart, dend);
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if (!mSign && !mDecimal) {
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return out;
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}
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if (out != null) {
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source = out;
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start = 0;
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end = out.length();
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}
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int sign = -1;
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int decimal = -1;
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int dlen = dest.length();
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/*
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* Find out if the existing text has '-' or '.' characters.
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*/
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for (int i = 0; i < dstart; i++) {
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char c = dest.charAt(i);
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if (c == '-') {
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sign = i;
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} else if (c == '.' || c == ',') {
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decimal = i;
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}
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}
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for (int i = dend; i < dlen; i++) {
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char c = dest.charAt(i);
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if (c == '-') {
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return ""; // Nothing can be inserted in front of a '-'.
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} else if (c == '.' || c == ',') {
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decimal = i;
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}
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}
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/*
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* If it does, we must strip them out from the source.
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* In addition, '-' must be the very first character,
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* and nothing can be inserted before an existing '-'.
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* Go in reverse order so the offsets are stable.
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*/
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SpannableStringBuilder stripped = null;
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for (int i = end - 1; i >= start; i--) {
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char c = source.charAt(i);
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boolean strip = false;
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if (c == '-') {
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if (i != start || dstart != 0) {
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strip = true;
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} else if (sign >= 0) {
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strip = true;
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} else {
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sign = i;
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}
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} else if (c == '.' || c == ',') {
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if (decimal >= 0) {
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strip = true;
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} else {
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decimal = i;
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}
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}
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if (strip) {
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if (end == start + 1) {
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return ""; // Only one character, and it was stripped.
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}
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if (stripped == null) {
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stripped = new SpannableStringBuilder(source, start, end);
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}
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stripped.delete(i - start, i + 1 - start);
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}
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}
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if (stripped != null) {
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return stripped;
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} else return out;
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}
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}
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@ -0,0 +1,145 @@
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package info.nightscout.core.ui.elements
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import android.text.InputType
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import android.text.SpannableStringBuilder
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import android.text.Spanned
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import android.text.method.NumberKeyListener
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internal class DigitsKeyListenerWithComma @JvmOverloads constructor(private val sign: Boolean = false, private val decimal: Boolean = false) : NumberKeyListener() {
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private var accepted: CharArray
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override fun getAcceptedChars(): CharArray = accepted
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/**
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* Allocates a DigitsKeyListener that accepts the digits 0 through 9,
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* plus the minus sign (only at the beginning) and/or decimal point
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* (only one per field) if specified.
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*/
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/**
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* Allocates a DigitsKeyListener that accepts the digits 0 through 9.
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*/
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init {
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val kind = (if (sign) SIGN else 0) or if (decimal) DECIMAL else 0
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accepted = CHARACTERS[kind]
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}
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override fun getInputType(): Int {
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var contentType = InputType.TYPE_CLASS_NUMBER
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if (sign) {
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contentType = contentType or InputType.TYPE_NUMBER_FLAG_SIGNED
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}
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if (decimal) {
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contentType = contentType or InputType.TYPE_NUMBER_FLAG_DECIMAL
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}
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return contentType
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}
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override fun filter(
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source: CharSequence, start: Int, end: Int,
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dest: Spanned, dstart: Int, dend: Int
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): CharSequence {
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var sourceSequence = source
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var startIndex = start
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var endIndex = end
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val out = super.filter(sourceSequence, startIndex, endIndex, dest, dstart, dend)
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if (!sign && !decimal) return out
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if (out != null) {
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sourceSequence = out
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startIndex = 0
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endIndex = out.length
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}
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var sign = -1
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var decimal = -1
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val dLen = dest.length
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/*
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* Find out if the existing text has '-' or '.' characters.
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*/
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for (i in 0 until dstart) {
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val c = dest[i]
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if (c == '-') sign = i
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else if (c == '.' || c == ',') decimal = i
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}
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for (i in dend until dLen) {
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val c = dest[i]
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if (c == '-') return "" // Nothing can be inserted in front of a '-'.
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else if (c == '.' || c == ',') decimal = i
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}
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/*
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* If it does, we must strip them out from the source.
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* In addition, '-' must be the very first character,
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* and nothing can be inserted before an existing '-'.
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* Go in reverse order so the offsets are stable.
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*/
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var stripped: SpannableStringBuilder? = null
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for (i in endIndex - 1 downTo startIndex) {
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val c = sourceSequence[i]
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var strip = false
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if (c == '-') {
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if (i != startIndex || dstart != 0) strip = true
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else if (sign >= 0) strip = true
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else sign = i
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} else if (c == '.' || c == ',') {
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if (decimal >= 0) strip = true
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else decimal = i
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}
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if (strip) {
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if (endIndex == startIndex + 1) return "" // Only one character, and it was stripped.
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if (stripped == null) stripped = SpannableStringBuilder(sourceSequence, startIndex, endIndex)
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stripped.delete(i - startIndex, i + 1 - startIndex)
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}
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}
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return stripped ?: out
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}
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companion object {
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/**
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* The characters that are used.
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*
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* @see android.view.KeyEvent.getMatch
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*
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* @see .getAcceptedChars
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*/
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private val CHARACTERS =
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arrayOf(
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charArrayOf('0', '1', '2', '3', '4', '5', '6', '7', '8', '9'),
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charArrayOf('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-'),
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charArrayOf('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.', ','),
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charArrayOf('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '.', ',')
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)
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private const val SIGN = 1
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private const val DECIMAL = 2
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private val sInstance = arrayOfNulls<DigitsKeyListenerWithComma>(4)
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val instance: DigitsKeyListenerWithComma?
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/**
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* Returns a DigitsKeyListener that accepts the digits 0 through 9.
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*/
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get() = getInstance(sign = false, decimal = false)
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/**
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* Returns a DigitsKeyListener that accepts the digits 0 through 9,
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* plus the minus sign (only at the beginning) and/or decimal point
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* (only one per field) if specified.
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*/
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fun getInstance(sign: Boolean, decimal: Boolean): DigitsKeyListenerWithComma? {
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val kind = (if (sign) SIGN else 0) or if (decimal) DECIMAL else 0
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if (sInstance[kind] != null) return sInstance[kind]
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sInstance[kind] = DigitsKeyListenerWithComma(sign, decimal)
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return sInstance[kind]
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}
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/**
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* Returns a DigitsKeyListener that accepts only the characters
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* that appear in the specified String. Note that not all characters
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* may be available on every keyboard.
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*/
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fun getInstance(accepted: String): DigitsKeyListenerWithComma {
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// TODO: do we need a cache of these to avoid allocating?
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val dim = DigitsKeyListenerWithComma()
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dim.accepted = CharArray(accepted.length)
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accepted.toCharArray(dim.accepted, 0, 0, accepted.length)
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return dim
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}
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}
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}
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