265 lines
10 KiB
Java
265 lines
10 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.android.inputmethod.keyboard.internal;
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import android.content.Context;
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import android.content.res.Resources;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import com.android.inputmethod.keyboard.Key;
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import com.android.inputmethod.keyboard.Keyboard;
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import com.android.inputmethod.keyboard.KeyboardView;
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import com.android.inputmethod.keyboard.MiniKeyboard;
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import com.android.inputmethod.latin.R;
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import java.util.List;
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public class MiniKeyboardBuilder {
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private final Resources mRes;
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private final MiniKeyboard mKeyboard;
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private final CharSequence[] mPopupCharacters;
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private final MiniKeyboardLayoutParams mParams;
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/* package */ static class MiniKeyboardLayoutParams {
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public final int mKeyWidth;
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public final int mRowHeight;
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/* package */ final int mTopRowAdjustment;
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public final int mNumRows;
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public final int mNumColumns;
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public final int mLeftKeys;
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public final int mRightKeys; // includes default key.
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public int mTopPadding;
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/**
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* The object holding mini keyboard layout parameters.
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*
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* @param numKeys number of keys in this mini keyboard.
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* @param maxColumns number of maximum columns of this mini keyboard.
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* @param keyWidth mini keyboard key width in pixel, including horizontal gap.
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* @param rowHeight mini keyboard row height in pixel, including vertical gap.
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* @param coordXInParent coordinate x of the popup key in parent keyboard.
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* @param parentKeyboardWidth parent keyboard width in pixel.
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* parent keyboard.
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*/
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public MiniKeyboardLayoutParams(int numKeys, int maxColumns, int keyWidth, int rowHeight,
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int coordXInParent, int parentKeyboardWidth) {
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if (parentKeyboardWidth / keyWidth < maxColumns)
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throw new IllegalArgumentException("Keyboard is too small to hold mini keyboard: "
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+ parentKeyboardWidth + " " + keyWidth + " " + maxColumns);
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mKeyWidth = keyWidth;
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mRowHeight = rowHeight;
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final int numRows = (numKeys + maxColumns - 1) / maxColumns;
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mNumRows = numRows;
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final int numColumns = getOptimizedColumns(numKeys, maxColumns);
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mNumColumns = numColumns;
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final int numLeftKeys = (numColumns - 1) / 2;
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final int numRightKeys = numColumns - numLeftKeys; // including default key.
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final int maxLeftKeys = coordXInParent / keyWidth;
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final int maxRightKeys = Math.max(1, (parentKeyboardWidth - coordXInParent) / keyWidth);
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int leftKeys, rightKeys;
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if (numLeftKeys > maxLeftKeys) {
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leftKeys = maxLeftKeys;
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rightKeys = numColumns - maxLeftKeys;
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} else if (numRightKeys > maxRightKeys) {
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leftKeys = numColumns - maxRightKeys;
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rightKeys = maxRightKeys;
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} else {
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leftKeys = numLeftKeys;
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rightKeys = numRightKeys;
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}
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// Shift right if the left edge of mini keyboard is on the edge of parent keyboard
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// unless the parent key is on the left edge.
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if (leftKeys * keyWidth >= coordXInParent && leftKeys > 0) {
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leftKeys--;
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rightKeys++;
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}
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// Shift left if the right edge of mini keyboard is on the edge of parent keyboard
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// unless the parent key is on the right edge.
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if (rightKeys * keyWidth + coordXInParent >= parentKeyboardWidth && rightKeys > 1) {
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leftKeys++;
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rightKeys--;
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}
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mLeftKeys = leftKeys;
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mRightKeys = rightKeys;
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// Centering of the top row.
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final boolean onEdge = (leftKeys == 0 || rightKeys == 1);
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if (numRows < 2 || onEdge || getTopRowEmptySlots(numKeys, numColumns) % 2 == 0) {
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mTopRowAdjustment = 0;
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} else if (mLeftKeys < mRightKeys - 1) {
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mTopRowAdjustment = 1;
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} else {
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mTopRowAdjustment = -1;
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}
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}
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// Return key position according to column count (0 is default).
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/* package */ int getColumnPos(int n) {
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final int col = n % mNumColumns;
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if (col == 0) {
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// default position.
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return 0;
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}
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int pos = 0;
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int right = 1; // include default position key.
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int left = 0;
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int i = 0;
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while (true) {
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// Assign right key if available.
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if (right < mRightKeys) {
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pos = right;
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right++;
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i++;
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}
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if (i >= col)
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break;
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// Assign left key if available.
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if (left < mLeftKeys) {
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left++;
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pos = -left;
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i++;
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}
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if (i >= col)
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break;
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}
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return pos;
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}
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private static int getTopRowEmptySlots(int numKeys, int numColumns) {
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final int remainingKeys = numKeys % numColumns;
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if (remainingKeys == 0) {
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return 0;
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} else {
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return numColumns - remainingKeys;
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}
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}
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private int getOptimizedColumns(int numKeys, int maxColumns) {
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int numColumns = Math.min(numKeys, maxColumns);
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while (getTopRowEmptySlots(numKeys, numColumns) >= mNumRows) {
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numColumns--;
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}
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return numColumns;
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}
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public int getDefaultKeyCoordX() {
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return mLeftKeys * mKeyWidth;
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}
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public int getX(int n, int row) {
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final int x = getColumnPos(n) * mKeyWidth + getDefaultKeyCoordX();
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if (isTopRow(row)) {
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return x + mTopRowAdjustment * (mKeyWidth / 2);
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}
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return x;
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}
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public int getY(int row) {
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return (mNumRows - 1 - row) * mRowHeight + mTopPadding;
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}
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public int getRowFlags(int row) {
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int rowFlags = 0;
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if (row == 0) rowFlags |= Keyboard.EDGE_TOP;
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if (isTopRow(row)) rowFlags |= Keyboard.EDGE_BOTTOM;
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return rowFlags;
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}
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private boolean isTopRow(int rowCount) {
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return rowCount == mNumRows - 1;
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}
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public void setTopPadding (int topPadding) {
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mTopPadding = topPadding;
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}
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public int getKeyboardHeight() {
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return mNumRows * mRowHeight + mTopPadding;
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}
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public int getKeyboardWidth() {
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return mNumColumns * mKeyWidth;
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}
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}
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public MiniKeyboardBuilder(KeyboardView view, int layoutTemplateResId, Key parentKey,
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Keyboard parentKeyboard) {
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final Context context = view.getContext();
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mRes = context.getResources();
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final MiniKeyboard keyboard = new MiniKeyboard(
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context, layoutTemplateResId, parentKeyboard);
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mKeyboard = keyboard;
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mPopupCharacters = parentKey.mPopupCharacters;
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final int keyWidth = getMaxKeyWidth(view, mPopupCharacters, keyboard.getKeyWidth());
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final MiniKeyboardLayoutParams params = new MiniKeyboardLayoutParams(
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mPopupCharacters.length, parentKey.mMaxPopupColumn,
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keyWidth, parentKeyboard.getRowHeight(),
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parentKey.mX + (parentKey.mWidth + parentKey.mGap) / 2 - keyWidth / 2,
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view.getMeasuredWidth());
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params.setTopPadding(keyboard.getVerticalGap());
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mParams = params;
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keyboard.setRowHeight(params.mRowHeight);
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keyboard.setKeyboardHeight(params.getKeyboardHeight());
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keyboard.setMinWidth(params.getKeyboardWidth());
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keyboard.setDefaultCoordX(params.getDefaultKeyCoordX() + params.mKeyWidth / 2);
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}
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private static int getMaxKeyWidth(KeyboardView view, CharSequence[] popupCharacters,
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int minKeyWidth) {
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Paint paint = null;
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Rect bounds = null;
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int maxWidth = 0;
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for (CharSequence popupSpec : popupCharacters) {
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final CharSequence label = PopupCharactersParser.getLabel(popupSpec.toString());
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// If the label is single letter, minKeyWidth is enough to hold the label.
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if (label != null && label.length() > 1) {
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if (paint == null) {
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paint = new Paint();
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paint.setAntiAlias(true);
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}
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final int labelSize = view.getDefaultLabelSizeAndSetPaint(paint);
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paint.setTextSize(labelSize);
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if (bounds == null) bounds = new Rect();
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paint.getTextBounds(label.toString(), 0, label.length(), bounds);
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if (maxWidth < bounds.width())
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maxWidth = bounds.width();
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}
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}
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final int horizontalPadding = (int)view.getContext().getResources().getDimension(
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R.dimen.mini_keyboard_key_horizontal_padding);
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return Math.max(minKeyWidth, maxWidth + horizontalPadding);
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}
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public MiniKeyboard build() {
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final MiniKeyboard keyboard = mKeyboard;
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final List<Key> keys = keyboard.getKeys();
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final MiniKeyboardLayoutParams params = mParams;
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for (int n = 0; n < mPopupCharacters.length; n++) {
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final CharSequence label = mPopupCharacters[n];
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final int row = n / params.mNumColumns;
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final Key key = new Key(mRes, keyboard, label, params.getX(n, row), params.getY(row),
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params.mKeyWidth, params.mRowHeight, params.getRowFlags(row));
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keys.add(key);
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}
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return keyboard;
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}
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}
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