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/*
* Copyright (C) 2010 Google Inc.
*
* 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.inputmethod.latin;
import com.android.inputmethod.latin.BaseKeyboard.Key;
import com.android.inputmethod.latin.BaseKeyboard.Row;
import org.xmlpull.v1.XmlPullParserException;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.content.res.XmlResourceParser;
import android.util.TypedValue;
import android.util.Xml;
import android.view.InflateException;
import java.io.IOException;
public class BaseKeyboardParser {
// Keyboard XML Tags
private static final String TAG_KEYBOARD = "Keyboard";
private static final String TAG_ROW = "Row";
private static final String TAG_KEY = "Key";
private static final String TAG_SPACER = "Spacer";
private static final String TAG_INCLUDE = "include";
private static final String TAG_MERGE = "merge";
private final BaseKeyboard mKeyboard;
private final Resources mResources;
private int mCurrentX = 0;
private int mCurrentY = 0;
private int mMaxRowWidth = 0;
private int mTotalHeight = 0;
private Row mCurrentRow = null;
public BaseKeyboardParser(BaseKeyboard keyboard, Resources res) {
mKeyboard = keyboard;
mResources = res;
}
public int getMaxRowWidth() {
return mMaxRowWidth;
}
public int getTotalHeight() {
return mTotalHeight;
}
public void parseKeyboard(XmlResourceParser parser)
throws XmlPullParserException, IOException {
final BaseKeyboard keyboard = mKeyboard;
Key key = null;
int event;
while ((event = parser.next()) != XmlResourceParser.END_DOCUMENT) {
if (event == XmlResourceParser.START_TAG) {
String tag = parser.getName();
if (TAG_ROW.equals(tag)) {
// TODO createRowFromXml should not be called from
// BaseKeyboard constructor.
Row row = keyboard.createRowFromXml(mResources, parser);
if (!startRow(row))
skipToEndOfRow(parser);
} else if (TAG_KEY.equals(tag)) {
// TODO createKeyFromXml should not be called from
// BaseKeyboard constructor.
key = keyboard.createKeyFromXml(mResources, mCurrentRow, mCurrentX, mCurrentY,
parser);
keyboard.getKeys().add(key);
if (key.codes[0] == BaseKeyboard.KEYCODE_SHIFT)
keyboard.getShiftKeys().add(key);
} else if (TAG_SPACER.equals(tag)) {
parseSpacerAttribute(parser);
} else if (TAG_KEYBOARD.equals(tag)) {
parseKeyboardAttributes(parser);
} else if (TAG_INCLUDE.equals(tag)) {
if (parser.getDepth() == 0)
throw new InflateException("<include /> cannot be the root element");
parseInclude(parser);
} else if (TAG_MERGE.equals(tag)) {
throw new InflateException(
"<merge> must not be appeared in keyboard XML file");
} else {
throw new InflateException("unknown start tag: " + tag);
}
} else if (event == XmlResourceParser.END_TAG) {
String tag = parser.getName();
if (TAG_KEY.equals(tag)) {
endKey(key);
} else if (TAG_ROW.equals(tag)) {
endRow();
} else if (TAG_SPACER.equals(tag)) {
;
} else if (TAG_KEYBOARD.equals(tag)) {
endKeyboard(mKeyboard.getVerticalGap());
} else if (TAG_INCLUDE.equals(tag)) {
;
} else if (TAG_MERGE.equals(tag)) {
return;
} else {
throw new InflateException("unknown end tag: " + tag);
}
}
}
}
// return true if the row is valid for this keyboard mode
private boolean startRow(Row row) {
mCurrentX = 0;
mCurrentRow = row;
return row.mode == 0 || row.mode == mKeyboard.getKeyboardMode();
}
private void skipRow() {
mCurrentRow = null;
}
private void endRow() {
if (mCurrentRow == null)
throw new InflateException("orphant end row tag");
mCurrentY += mCurrentRow.verticalGap + mCurrentRow.defaultHeight;
mCurrentRow = null;
}
private void endKey(Key key) {
mCurrentX += key.gap + key.width;
if (mCurrentX > mMaxRowWidth)
mMaxRowWidth = mCurrentX;
}
private void endKeyboard(int defaultVerticalGap) {
mTotalHeight = mCurrentY - defaultVerticalGap;
}
private void setSpacer(int gap) {
mCurrentX += gap;
}
private void parseSpacerAttribute(XmlResourceParser parser) {
final TypedArray a = mResources.obtainAttributes(Xml.asAttributeSet(parser),
R.styleable.BaseKeyboard);
int gap = getDimensionOrFraction(a, R.styleable.BaseKeyboard_horizontalGap,
mKeyboard.getKeyboardWidth(), 0);
a.recycle();
setSpacer(gap);
}
private void parseInclude(XmlResourceParser parent)
throws XmlPullParserException, IOException {
final TypedArray a = mResources.obtainAttributes(Xml.asAttributeSet(parent),
R.styleable.BaseKeyboard_Include);
final int keyboardLayout = a.getResourceId(
R.styleable.BaseKeyboard_Include_keyboardLayout, 0);
a.recycle();
if (keyboardLayout == 0)
throw new InflateException("<include /> must have keyboardLayout attribute");
final XmlResourceParser parser = mResources.getLayout(keyboardLayout);
int event;
while ((event = parser.next()) != XmlResourceParser.END_DOCUMENT) {
if (event == XmlResourceParser.START_TAG) {
String name = parser.getName();
if (TAG_MERGE.equals(name)) {
parseKeyboard(parser);
return;
} else {
throw new InflateException(
"include keyboard layout must have <merge> root element");
}
}
}
}
private void skipToEndOfRow(XmlResourceParser parser)
throws XmlPullParserException, IOException {
int event;
while ((event = parser.next()) != XmlResourceParser.END_DOCUMENT) {
if (event == XmlResourceParser.END_TAG) {
String tag = parser.getName();
if (TAG_ROW.equals(tag)) {
skipRow();
return;
}
}
}
throw new InflateException("can not find </Row>");
}
private void parseKeyboardAttributes(XmlResourceParser parser) {
final BaseKeyboard keyboard = mKeyboard;
final TypedArray a = mResources.obtainAttributes(Xml.asAttributeSet(parser),
R.styleable.BaseKeyboard);
final int width = keyboard.getKeyboardWidth();
final int height = keyboard.getKeyboardHeight();
keyboard.setKeyWidth(getDimensionOrFraction(a,
R.styleable.BaseKeyboard_keyWidth, width, width / 10));
keyboard.setKeyHeight(getDimensionOrFraction(a,
R.styleable.BaseKeyboard_keyHeight, height, 50));
keyboard.setHorizontalGap(getDimensionOrFraction(a,
R.styleable.BaseKeyboard_horizontalGap, width, 0));
keyboard.setVerticalGap(getDimensionOrFraction(a,
R.styleable.BaseKeyboard_verticalGap, height, 0));
a.recycle();
}
public static int getDimensionOrFraction(TypedArray a, int index, int base, int defValue) {
final TypedValue value = a.peekValue(index);
if (value == null)
return defValue;
if (value.type == TypedValue.TYPE_DIMENSION) {
return a.getDimensionPixelOffset(index, defValue);
} else if (value.type == TypedValue.TYPE_FRACTION) {
// Round it to avoid values like 47.9999 from getting truncated
return Math.round(a.getFraction(index, base, base, defValue));
}
return defValue;
}
}
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