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/*
* Copyright (C) 2006 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 android.text.method;
import android.view.KeyEvent;
import android.view.View;
import android.text.Editable;
import android.text.InputFilter;
import android.text.Selection;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
/**
* For numeric text entry
* <p></p>
* As for all implementations of {@link KeyListener}, this class is only concerned
* with hardware keyboards. Software input methods have no obligation to trigger
* the methods in this class.
*/
public abstract class NumberKeyListener extends BaseKeyListener
implements InputFilter
{
/**
* You can say which characters you can accept.
*/
protected abstract char[] getAcceptedChars();
protected int lookup(KeyEvent event, Spannable content) {
return event.getMatch(getAcceptedChars(), getMetaState(content, event));
}
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
char[] accept = getAcceptedChars();
boolean filter = false;
int i;
for (i = start; i < end; i++) {
if (!ok(accept, source.charAt(i))) {
break;
}
}
if (i == end) {
// It was all OK.
return null;
}
if (end - start == 1) {
// It was not OK, and there is only one char, so nothing remains.
return "";
}
SpannableStringBuilder filtered =
new SpannableStringBuilder(source, start, end);
i -= start;
end -= start;
int len = end - start;
// Only count down to i because the chars before that were all OK.
for (int j = end - 1; j >= i; j--) {
if (!ok(accept, source.charAt(j))) {
filtered.delete(j, j + 1);
}
}
return filtered;
}
protected static boolean ok(char[] accept, char c) {
for (int i = accept.length - 1; i >= 0; i--) {
if (accept[i] == c) {
return true;
}
}
return false;
}
@Override
public boolean onKeyDown(View view, Editable content,
int keyCode, KeyEvent event) {
int selStart, selEnd;
{
int a = Selection.getSelectionStart(content);
int b = Selection.getSelectionEnd(content);
selStart = Math.min(a, b);
selEnd = Math.max(a, b);
}
if (selStart < 0 || selEnd < 0) {
selStart = selEnd = 0;
Selection.setSelection(content, 0);
}
int i = event != null ? lookup(event, content) : 0;
int repeatCount = event != null ? event.getRepeatCount() : 0;
if (repeatCount == 0) {
if (i != 0) {
if (selStart != selEnd) {
Selection.setSelection(content, selEnd);
}
content.replace(selStart, selEnd, String.valueOf((char) i));
adjustMetaAfterKeypress(content);
return true;
}
} else if (i == '0' && repeatCount == 1) {
// Pretty hackish, it replaces the 0 with the +
if (selStart == selEnd && selEnd > 0 &&
content.charAt(selStart - 1) == '0') {
content.replace(selStart - 1, selEnd, String.valueOf('+'));
adjustMetaAfterKeypress(content);
return true;
}
}
adjustMetaAfterKeypress(content);
return super.onKeyDown(view, content, keyCode, event);
}
}
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