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/*
* Copyright (C) 2012 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 com.android.inputmethod.keyboard.internal;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.util.Xml;
import com.android.inputmethod.keyboard.Key;
import com.android.inputmethod.keyboard.Keyboard;
import com.android.inputmethod.latin.R;
import com.android.inputmethod.latin.utils.ResourceUtils;
import org.xmlpull.v1.XmlPullParser;
import java.util.ArrayDeque;
/**
* Container for keys in the keyboard. All keys in a row are at the same Y-coordinate.
* Some of the key size defaults can be overridden per row from what the {@link Keyboard}
* defines.
*/
public final class KeyboardRow {
// keyWidth enum constants
private static final int KEYWIDTH_NOT_ENUM = 0;
private static final int KEYWIDTH_FILL_RIGHT = -1;
private final KeyboardParams mParams;
/** The height of this row. */
private final int mRowHeight;
private final ArrayDeque<RowAttributes> mRowAttributesStack = new ArrayDeque<>();
// TODO: Add keyActionFlags.
private static class RowAttributes {
/** Default width of a key in this row. */
public final float mDefaultKeyWidth;
/** Default keyLabelFlags in this row. */
public final int mDefaultKeyLabelFlags;
/** Default backgroundType for this row */
public final int mDefaultBackgroundType;
/**
* Parse and create key attributes. This constructor is used to parse Row tag.
*
* @param keyAttr an attributes array of Row tag.
* @param defaultKeyWidth a default key width.
* @param keyboardWidth the keyboard width that is required to calculate keyWidth attribute.
*/
public RowAttributes(final TypedArray keyAttr, final float defaultKeyWidth,
final int keyboardWidth) {
mDefaultKeyWidth = keyAttr.getFraction(R.styleable.Keyboard_Key_keyWidth,
keyboardWidth, keyboardWidth, defaultKeyWidth);
mDefaultKeyLabelFlags = keyAttr.getInt(R.styleable.Keyboard_Key_keyLabelFlags, 0);
mDefaultBackgroundType = keyAttr.getInt(R.styleable.Keyboard_Key_backgroundType,
Key.BACKGROUND_TYPE_NORMAL);
}
/**
* Parse and update key attributes using default attributes. This constructor is used
* to parse include tag.
*
* @param keyAttr an attributes array of include tag.
* @param defaultRowAttr default Row attributes.
* @param keyboardWidth the keyboard width that is required to calculate keyWidth attribute.
*/
public RowAttributes(final TypedArray keyAttr, final RowAttributes defaultRowAttr,
final int keyboardWidth) {
mDefaultKeyWidth = keyAttr.getFraction(R.styleable.Keyboard_Key_keyWidth,
keyboardWidth, keyboardWidth, defaultRowAttr.mDefaultKeyWidth);
mDefaultKeyLabelFlags = keyAttr.getInt(R.styleable.Keyboard_Key_keyLabelFlags, 0)
| defaultRowAttr.mDefaultKeyLabelFlags;
mDefaultBackgroundType = keyAttr.getInt(R.styleable.Keyboard_Key_backgroundType,
defaultRowAttr.mDefaultBackgroundType);
}
}
private final int mCurrentY;
// Will be updated by {@link Key}'s constructor.
private float mCurrentX;
public KeyboardRow(final Resources res, final KeyboardParams params,
final XmlPullParser parser, final int y) {
mParams = params;
final TypedArray keyboardAttr = res.obtainAttributes(Xml.asAttributeSet(parser),
R.styleable.Keyboard);
mRowHeight = (int)ResourceUtils.getDimensionOrFraction(keyboardAttr,
R.styleable.Keyboard_rowHeight, params.mBaseHeight, params.mDefaultRowHeight);
keyboardAttr.recycle();
final TypedArray keyAttr = res.obtainAttributes(Xml.asAttributeSet(parser),
R.styleable.Keyboard_Key);
mRowAttributesStack.push(new RowAttributes(
keyAttr, params.mDefaultKeyWidth, params.mBaseWidth));
keyAttr.recycle();
mCurrentY = y;
mCurrentX = 0.0f;
}
public int getRowHeight() {
return mRowHeight;
}
public void pushRowAttributes(final TypedArray keyAttr) {
final RowAttributes newAttributes = new RowAttributes(
keyAttr, mRowAttributesStack.peek(), mParams.mBaseWidth);
mRowAttributesStack.push(newAttributes);
}
public void popRowAttributes() {
mRowAttributesStack.pop();
}
public float getDefaultKeyWidth() {
return mRowAttributesStack.peek().mDefaultKeyWidth;
}
public int getDefaultKeyLabelFlags() {
return mRowAttributesStack.peek().mDefaultKeyLabelFlags;
}
public int getDefaultBackgroundType() {
return mRowAttributesStack.peek().mDefaultBackgroundType;
}
public void setXPos(final float keyXPos) {
mCurrentX = keyXPos;
}
public void advanceXPos(final float width) {
mCurrentX += width;
}
public int getKeyY() {
return mCurrentY;
}
public float getKeyX(final TypedArray keyAttr) {
if (keyAttr == null || !keyAttr.hasValue(R.styleable.Keyboard_Key_keyXPos)) {
return mCurrentX;
}
final float keyXPos = keyAttr.getFraction(R.styleable.Keyboard_Key_keyXPos,
mParams.mBaseWidth, mParams.mBaseWidth, 0);
if (keyXPos >= 0) {
return keyXPos + mParams.mLeftPadding;
}
// If keyXPos is negative, the actual x-coordinate will be
// keyboardWidth + keyXPos.
// keyXPos shouldn't be less than mCurrentX because drawable area for this
// key starts at mCurrentX. Or, this key will overlaps the adjacent key on
// its left hand side.
final int keyboardRightEdge = mParams.mOccupiedWidth - mParams.mRightPadding;
return Math.max(keyXPos + keyboardRightEdge, mCurrentX);
}
public float getKeyWidth(final TypedArray keyAttr, final float keyXPos) {
if (keyAttr == null) {
return getDefaultKeyWidth();
}
final int widthType = ResourceUtils.getEnumValue(keyAttr,
R.styleable.Keyboard_Key_keyWidth, KEYWIDTH_NOT_ENUM);
switch (widthType) {
case KEYWIDTH_FILL_RIGHT:
// If keyWidth is fillRight, the actual key width will be determined to fill
// out the area up to the right edge of the keyboard.
final int keyboardRightEdge = mParams.mOccupiedWidth - mParams.mRightPadding;
return keyboardRightEdge - keyXPos;
default: // KEYWIDTH_NOT_ENUM
return keyAttr.getFraction(R.styleable.Keyboard_Key_keyWidth,
mParams.mBaseWidth, mParams.mBaseWidth, getDefaultKeyWidth());
}
}
}
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