431 lines
18 KiB
Java
431 lines
18 KiB
Java
/*
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* Copyright (C) 2008 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;
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import com.android.inputmethod.latin.R;
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import com.android.inputmethod.latin.SubtypeSwitcher;
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import android.content.Context;
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import android.content.res.Resources;
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import android.content.res.TypedArray;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.Paint.Align;
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import android.graphics.PorterDuff;
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import android.graphics.Rect;
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import android.graphics.drawable.BitmapDrawable;
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import android.graphics.drawable.Drawable;
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import android.util.Log;
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import java.util.List;
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import java.util.Locale;
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// TODO: We should remove this class
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public class LatinKeyboard extends Keyboard {
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private static final boolean DEBUG_PREFERRED_LETTER = false;
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private static final String TAG = "LatinKeyboard";
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public static final int OPACITY_FULLY_OPAQUE = 255;
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private static final int SPACE_LED_LENGTH_PERCENT = 80;
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private Drawable mShiftLockPreviewIcon;
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private Drawable mSpaceAutoCompletionIndicator;
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private final Drawable mButtonArrowLeftIcon;
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private final Drawable mButtonArrowRightIcon;
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private final int mSpaceBarTextShadowColor;
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private int mSpaceKeyIndex = -1;
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private int mSpaceDragStartX;
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private int mSpaceDragLastDiff;
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private final Resources mRes;
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private final Context mContext;
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private boolean mCurrentlyInSpace;
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private SlidingLocaleDrawable mSlidingLocaleIcon;
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private int[] mPrefLetterFrequencies;
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private int mPrefLetter;
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private int mPrefLetterX;
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private int mPrefLetterY;
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private int mPrefDistance;
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private static final float SPACEBAR_DRAG_THRESHOLD = 0.8f;
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private static final float OVERLAP_PERCENTAGE_LOW_PROB = 0.70f;
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private static final float OVERLAP_PERCENTAGE_HIGH_PROB = 0.85f;
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// Minimum width of space key preview (proportional to keyboard width)
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private static final float SPACEBAR_POPUP_MIN_RATIO = 0.4f;
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// Height in space key the language name will be drawn. (proportional to space key height)
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public static final float SPACEBAR_LANGUAGE_BASELINE = 0.6f;
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// If the full language name needs to be smaller than this value to be drawn on space key,
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// its short language name will be used instead.
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private static final float MINIMUM_SCALE_OF_LANGUAGE_NAME = 0.8f;
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private static int sSpacebarVerticalCorrection;
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public LatinKeyboard(Context context, KeyboardId id) {
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super(context, id);
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final Resources res = context.getResources();
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mContext = context;
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mRes = res;
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if (id.mColorScheme == KeyboardView.COLOR_SCHEME_BLACK) {
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mSpaceBarTextShadowColor = res.getColor(
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R.color.latinkeyboard_bar_language_shadow_black);
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} else { // default color scheme is KeyboardView.COLOR_SCHEME_WHITE
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mSpaceBarTextShadowColor = res.getColor(
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R.color.latinkeyboard_bar_language_shadow_white);
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}
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mShiftLockPreviewIcon = res.getDrawable(R.drawable.sym_keyboard_feedback_shift_locked);
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setDefaultBounds(mShiftLockPreviewIcon);
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mSpaceAutoCompletionIndicator = res.getDrawable(R.drawable.sym_keyboard_space_led);
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mButtonArrowLeftIcon = res.getDrawable(R.drawable.sym_keyboard_language_arrows_left);
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mButtonArrowRightIcon = res.getDrawable(R.drawable.sym_keyboard_language_arrows_right);
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sSpacebarVerticalCorrection = res.getDimensionPixelOffset(
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R.dimen.spacebar_vertical_correction);
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mSpaceKeyIndex = indexOf(CODE_SPACE);
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}
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/**
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* @return a key which should be invalidated.
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*/
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public Key onAutoCompletionStateChanged(boolean isAutoCompletion) {
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updateSpaceBarForLocale(isAutoCompletion);
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return mSpaceKey;
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}
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private void updateSpaceBarForLocale(boolean isAutoCompletion) {
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final Resources res = mRes;
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// If application locales are explicitly selected.
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if (SubtypeSwitcher.getInstance().needsToDisplayLanguage()) {
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mSpaceKey.mIcon = new BitmapDrawable(res,
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drawSpaceBar(OPACITY_FULLY_OPAQUE, isAutoCompletion));
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} else {
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// sym_keyboard_space_led can be shared with Black and White symbol themes.
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if (isAutoCompletion) {
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mSpaceKey.mIcon = new BitmapDrawable(res,
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drawSpaceBar(OPACITY_FULLY_OPAQUE, isAutoCompletion));
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} else {
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mSpaceKey.mIcon = mSpaceIcon;
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}
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}
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}
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// Compute width of text with specified text size using paint.
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private static int getTextWidth(Paint paint, String text, float textSize, Rect bounds) {
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paint.setTextSize(textSize);
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paint.getTextBounds(text, 0, text.length(), bounds);
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return bounds.width();
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}
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// Layout local language name and left and right arrow on space bar.
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private static String layoutSpaceBar(Paint paint, Locale locale, Drawable lArrow,
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Drawable rArrow, int width, int height, float origTextSize,
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boolean allowVariableTextSize) {
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final float arrowWidth = lArrow.getIntrinsicWidth();
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final float arrowHeight = lArrow.getIntrinsicHeight();
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final float maxTextWidth = width - (arrowWidth + arrowWidth);
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final Rect bounds = new Rect();
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// Estimate appropriate language name text size to fit in maxTextWidth.
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String language = SubtypeSwitcher.getDisplayLanguage(locale);
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int textWidth = getTextWidth(paint, language, origTextSize, bounds);
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// Assuming text width and text size are proportional to each other.
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float textSize = origTextSize * Math.min(maxTextWidth / textWidth, 1.0f);
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final boolean useShortName;
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if (allowVariableTextSize) {
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textWidth = getTextWidth(paint, language, textSize, bounds);
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// If text size goes too small or text does not fit, use short name
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useShortName = textSize / origTextSize < MINIMUM_SCALE_OF_LANGUAGE_NAME
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|| textWidth > maxTextWidth;
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} else {
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useShortName = textWidth > maxTextWidth;
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textSize = origTextSize;
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}
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if (useShortName) {
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language = SubtypeSwitcher.getShortDisplayLanguage(locale);
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textWidth = getTextWidth(paint, language, origTextSize, bounds);
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textSize = origTextSize * Math.min(maxTextWidth / textWidth, 1.0f);
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}
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paint.setTextSize(textSize);
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// Place left and right arrow just before and after language text.
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final float baseline = height * SPACEBAR_LANGUAGE_BASELINE;
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final int top = (int)(baseline - arrowHeight);
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final float remains = (width - textWidth) / 2;
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lArrow.setBounds((int)(remains - arrowWidth), top, (int)remains, (int)baseline);
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rArrow.setBounds((int)(remains + textWidth), top, (int)(remains + textWidth + arrowWidth),
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(int)baseline);
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return language;
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}
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@SuppressWarnings("unused")
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private Bitmap drawSpaceBar(int opacity, boolean isAutoCompletion) {
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final int width = mSpaceKey.mWidth;
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final int height = mSpaceIcon.getIntrinsicHeight();
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final Bitmap buffer = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
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final Canvas canvas = new Canvas(buffer);
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final Resources res = mRes;
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canvas.drawColor(res.getColor(R.color.latinkeyboard_transparent), PorterDuff.Mode.CLEAR);
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SubtypeSwitcher subtypeSwitcher = SubtypeSwitcher.getInstance();
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// If application locales are explicitly selected.
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if (subtypeSwitcher.needsToDisplayLanguage()) {
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final Paint paint = new Paint();
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paint.setAlpha(opacity);
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paint.setAntiAlias(true);
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paint.setTextAlign(Align.CENTER);
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final boolean allowVariableTextSize = true;
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final String language = layoutSpaceBar(paint, subtypeSwitcher.getInputLocale(),
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mButtonArrowLeftIcon, mButtonArrowRightIcon, width, height,
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getTextSizeFromTheme(android.R.style.TextAppearance_Small, 14),
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allowVariableTextSize);
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// Draw language text with shadow
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final float baseline = height * SPACEBAR_LANGUAGE_BASELINE;
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final float descent = paint.descent();
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paint.setColor(mSpaceBarTextShadowColor);
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canvas.drawText(language, width / 2, baseline - descent - 1, paint);
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paint.setColor(res.getColor(R.color.latinkeyboard_bar_language_text));
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canvas.drawText(language, width / 2, baseline - descent, paint);
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// Put arrows that are already layed out on either side of the text
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if (SubtypeSwitcher.USE_SPACEBAR_LANGUAGE_SWITCHER
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&& subtypeSwitcher.getEnabledKeyboardLocaleCount() > 1) {
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mButtonArrowLeftIcon.draw(canvas);
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mButtonArrowRightIcon.draw(canvas);
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}
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}
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// Draw the spacebar icon at the bottom
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if (isAutoCompletion) {
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final int iconWidth = width * SPACE_LED_LENGTH_PERCENT / 100;
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final int iconHeight = mSpaceAutoCompletionIndicator.getIntrinsicHeight();
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int x = (width - iconWidth) / 2;
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int y = height - iconHeight;
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mSpaceAutoCompletionIndicator.setBounds(x, y, x + iconWidth, y + iconHeight);
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mSpaceAutoCompletionIndicator.draw(canvas);
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} else {
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final int iconWidth = mSpaceIcon.getIntrinsicWidth();
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final int iconHeight = mSpaceIcon.getIntrinsicHeight();
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int x = (width - iconWidth) / 2;
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int y = height - iconHeight;
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mSpaceIcon.setBounds(x, y, x + iconWidth, y + iconHeight);
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mSpaceIcon.draw(canvas);
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}
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return buffer;
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}
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private void updateLocaleDrag(int diff) {
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if (mSlidingLocaleIcon == null) {
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final int width = Math.max(mSpaceKey.mWidth,
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(int)(getMinWidth() * SPACEBAR_POPUP_MIN_RATIO));
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final int height = mSpacePreviewIcon.getIntrinsicHeight();
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mSlidingLocaleIcon =
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new SlidingLocaleDrawable(mContext, mSpacePreviewIcon, width, height);
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mSlidingLocaleIcon.setBounds(0, 0, width, height);
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mSpaceKey.mPreviewIcon = mSlidingLocaleIcon;
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}
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mSlidingLocaleIcon.setDiff(diff);
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if (Math.abs(diff) == Integer.MAX_VALUE) {
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mSpaceKey.mPreviewIcon = mSpacePreviewIcon;
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} else {
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mSpaceKey.mPreviewIcon = mSlidingLocaleIcon;
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}
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mSpaceKey.mPreviewIcon.invalidateSelf();
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}
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public int getLanguageChangeDirection() {
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if (mSpaceKey == null || SubtypeSwitcher.getInstance().getEnabledKeyboardLocaleCount() <= 1
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|| Math.abs(mSpaceDragLastDiff) < mSpaceKey.mWidth * SPACEBAR_DRAG_THRESHOLD) {
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return 0; // No change
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}
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return mSpaceDragLastDiff > 0 ? 1 : -1;
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}
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public void setPreferredLetters(int[] frequencies) {
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mPrefLetterFrequencies = frequencies;
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mPrefLetter = 0;
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}
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public void keyReleased() {
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mCurrentlyInSpace = false;
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mSpaceDragLastDiff = 0;
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mPrefLetter = 0;
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mPrefLetterX = 0;
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mPrefLetterY = 0;
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mPrefDistance = Integer.MAX_VALUE;
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if (mSpaceKey != null) {
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updateLocaleDrag(Integer.MAX_VALUE);
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}
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}
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/**
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* Does the magic of locking the touch gesture into the spacebar when
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* switching input languages.
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*/
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@Override
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@SuppressWarnings("unused") // SubtypeSwitcher.USE_SPACEBAR_LANGUAGE_SWITCHER is constant
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public boolean isInside(Key key, int x, int y) {
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final int code = key.mCodes[0];
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if (code == CODE_SHIFT || code == CODE_DELETE) {
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y -= key.mHeight / 10;
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if (code == CODE_SHIFT) x += key.mWidth / 6;
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if (code == CODE_DELETE) x -= key.mWidth / 6;
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} else if (code == CODE_SPACE) {
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y += LatinKeyboard.sSpacebarVerticalCorrection;
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if (SubtypeSwitcher.USE_SPACEBAR_LANGUAGE_SWITCHER
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&& SubtypeSwitcher.getInstance().getEnabledKeyboardLocaleCount() > 1) {
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if (mCurrentlyInSpace) {
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int diff = x - mSpaceDragStartX;
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if (Math.abs(diff - mSpaceDragLastDiff) > 0) {
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updateLocaleDrag(diff);
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}
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mSpaceDragLastDiff = diff;
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return true;
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} else {
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boolean isOnSpace = key.isOnKey(x, y);
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if (isOnSpace) {
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mCurrentlyInSpace = true;
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mSpaceDragStartX = x;
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updateLocaleDrag(0);
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}
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return isOnSpace;
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}
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}
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} else if (mPrefLetterFrequencies != null) {
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// New coordinate? Reset
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if (mPrefLetterX != x || mPrefLetterY != y) {
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mPrefLetter = 0;
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mPrefDistance = Integer.MAX_VALUE;
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}
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// Handle preferred next letter
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final int[] pref = mPrefLetterFrequencies;
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if (mPrefLetter > 0) {
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if (DEBUG_PREFERRED_LETTER) {
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if (mPrefLetter == code && !key.isOnKey(x, y)) {
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Log.d(TAG, "CORRECTED !!!!!!");
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}
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}
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return mPrefLetter == code;
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} else {
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final boolean isOnKey = key.isOnKey(x, y);
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int[] nearby = getNearestKeys(x, y);
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List<Key> nearbyKeys = getKeys();
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if (isOnKey) {
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// If it's a preferred letter
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if (inPrefList(code, pref)) {
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// Check if its frequency is much lower than a nearby key
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mPrefLetter = code;
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mPrefLetterX = x;
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mPrefLetterY = y;
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for (int i = 0; i < nearby.length; i++) {
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Key k = nearbyKeys.get(nearby[i]);
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if (k != key && inPrefList(k.mCodes[0], pref)) {
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final int dist = distanceFrom(k, x, y);
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if (dist < (int) (k.mWidth * OVERLAP_PERCENTAGE_LOW_PROB) &&
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(pref[k.mCodes[0]] > pref[mPrefLetter] * 3)) {
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mPrefLetter = k.mCodes[0];
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mPrefDistance = dist;
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if (DEBUG_PREFERRED_LETTER) {
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Log.d(TAG, "CORRECTED ALTHOUGH PREFERRED !!!!!!");
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}
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break;
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}
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}
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}
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return mPrefLetter == code;
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}
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}
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// Get the surrounding keys and intersect with the preferred list
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// For all in the intersection
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// if distance from touch point is within a reasonable distance
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// make this the pref letter
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// If no pref letter
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// return inside;
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// else return thiskey == prefletter;
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for (int i = 0; i < nearby.length; i++) {
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Key k = nearbyKeys.get(nearby[i]);
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if (inPrefList(k.mCodes[0], pref)) {
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final int dist = distanceFrom(k, x, y);
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if (dist < (int) (k.mWidth * OVERLAP_PERCENTAGE_HIGH_PROB)
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&& dist < mPrefDistance) {
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mPrefLetter = k.mCodes[0];
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mPrefLetterX = x;
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mPrefLetterY = y;
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mPrefDistance = dist;
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}
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}
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}
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// Didn't find any
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if (mPrefLetter == 0) {
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return isOnKey;
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} else {
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return mPrefLetter == code;
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}
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}
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}
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// Lock into the spacebar
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if (mCurrentlyInSpace) return false;
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return key.isOnKey(x, y);
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}
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private boolean inPrefList(int code, int[] pref) {
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if (code < pref.length && code >= 0) return pref[code] > 0;
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return false;
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}
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private int distanceFrom(Key k, int x, int y) {
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if (y > k.mY && y < k.mY + k.mHeight) {
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return Math.abs(k.mX + k.mWidth / 2 - x);
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} else {
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return Integer.MAX_VALUE;
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}
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}
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@Override
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public int[] getNearestKeys(int x, int y) {
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if (mCurrentlyInSpace) {
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return new int[] { mSpaceKeyIndex };
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} else {
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// Avoid dead pixels at edges of the keyboard
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return super.getNearestKeys(Math.max(0, Math.min(x, getMinWidth() - 1)),
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Math.max(0, Math.min(y, getHeight() - 1)));
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}
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}
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private int indexOf(int code) {
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List<Key> keys = getKeys();
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int count = keys.size();
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for (int i = 0; i < count; i++) {
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if (keys.get(i).mCodes[0] == code) return i;
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}
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return -1;
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}
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private int getTextSizeFromTheme(int style, int defValue) {
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TypedArray array = mContext.getTheme().obtainStyledAttributes(
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style, new int[] { android.R.attr.textSize });
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int textSize = array.getDimensionPixelSize(array.getResourceId(0, 0), defValue);
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return textSize;
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}
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}
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