diff options
Diffstat (limited to 'java/src/com/android/inputmethod/latin/LatinKeyboard.java')
| -rw-r--r-- | java/src/com/android/inputmethod/latin/LatinKeyboard.java | 762 |
1 files changed, 762 insertions, 0 deletions
diff --git a/java/src/com/android/inputmethod/latin/LatinKeyboard.java b/java/src/com/android/inputmethod/latin/LatinKeyboard.java new file mode 100644 index 000000000..58e1dc767 --- /dev/null +++ b/java/src/com/android/inputmethod/latin/LatinKeyboard.java @@ -0,0 +1,762 @@ +/* + * Copyright (C) 2008-2009 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 java.util.List; +import java.util.Locale; + +import android.content.Context; +import android.content.res.Resources; +import android.content.res.TypedArray; +import android.content.res.XmlResourceParser; +import android.graphics.Bitmap; +import android.graphics.Canvas; +import android.graphics.ColorFilter; +import android.graphics.Paint; +import android.graphics.PixelFormat; +import android.graphics.PorterDuff; +import android.graphics.Rect; +import android.graphics.Paint.Align; +import android.graphics.drawable.BitmapDrawable; +import android.graphics.drawable.Drawable; +import android.inputmethodservice.Keyboard; +import android.text.TextPaint; +import android.util.Log; +import android.view.ViewConfiguration; +import android.view.inputmethod.EditorInfo; + +public class LatinKeyboard extends Keyboard { + + private static final boolean DEBUG_PREFERRED_LETTER = false; + private static final String TAG = "LatinKeyboard"; + + private Drawable mShiftLockIcon; + private Drawable mShiftLockPreviewIcon; + private Drawable mOldShiftIcon; + private Drawable mOldShiftPreviewIcon; + private Drawable mSpaceIcon; + private Drawable mSpacePreviewIcon; + private Drawable mMicIcon; + private Drawable mMicPreviewIcon; + private Drawable m123MicIcon; + private Drawable m123MicPreviewIcon; + private Drawable mButtonArrowLeftIcon; + private Drawable mButtonArrowRightIcon; + private Key mShiftKey; + private Key mEnterKey; + private Key mF1Key; + private Key mSpaceKey; + private Key m123Key; + private int mSpaceKeyIndex = -1; + private int mSpaceDragStartX; + private int mSpaceDragLastDiff; + /* package */ Locale mLocale; + private LanguageSwitcher mLanguageSwitcher; + private Resources mRes; + private Context mContext; + private int mMode; + // Whether this keyboard has voice icon on it + private boolean mHasVoiceButton; + // Whether voice icon is enabled at all + private boolean mVoiceEnabled; + private boolean mIsAlphaKeyboard; + private CharSequence m123Label; + private boolean mCurrentlyInSpace; + private SlidingLocaleDrawable mSlidingLocaleIcon; + private Rect mBounds = new Rect(); + private int[] mPrefLetterFrequencies; + private boolean mPreemptiveCorrection; + private int mPrefLetter; + private int mPrefLetterX; + private int mPrefLetterY; + private int mPrefDistance; + + private int mExtensionResId; + + private static final int SHIFT_OFF = 0; + private static final int SHIFT_ON = 1; + private static final int SHIFT_LOCKED = 2; + + private int mShiftState = SHIFT_OFF; + + private static final float SPACEBAR_DRAG_THRESHOLD = 0.8f; + private static final float OVERLAP_PERCENTAGE_LOW_PROB = 0.70f; + private static final float OVERLAP_PERCENTAGE_HIGH_PROB = 0.85f; + + static int sSpacebarVerticalCorrection; + + public LatinKeyboard(Context context, int xmlLayoutResId) { + this(context, xmlLayoutResId, 0); + } + + public LatinKeyboard(Context context, int xmlLayoutResId, int mode) { + super(context, xmlLayoutResId, mode); + final Resources res = context.getResources(); + mContext = context; + mMode = mode; + mRes = res; + mShiftLockIcon = res.getDrawable(R.drawable.sym_keyboard_shift_locked); + mShiftLockPreviewIcon = res.getDrawable(R.drawable.sym_keyboard_feedback_shift_locked); + mShiftLockPreviewIcon.setBounds(0, 0, + mShiftLockPreviewIcon.getIntrinsicWidth(), + mShiftLockPreviewIcon.getIntrinsicHeight()); + mSpaceIcon = res.getDrawable(R.drawable.sym_keyboard_space); + mSpacePreviewIcon = res.getDrawable(R.drawable.sym_keyboard_feedback_space); + mMicIcon = res.getDrawable(R.drawable.sym_keyboard_mic); + mMicPreviewIcon = res.getDrawable(R.drawable.sym_keyboard_feedback_mic); + setDefaultBounds(mMicPreviewIcon); + mButtonArrowLeftIcon = res.getDrawable(R.drawable.sym_keyboard_language_arrows_left); + mButtonArrowRightIcon = res.getDrawable(R.drawable.sym_keyboard_language_arrows_right); + m123MicIcon = res.getDrawable(R.drawable.sym_keyboard_123_mic); + m123MicPreviewIcon = res.getDrawable(R.drawable.sym_keyboard_feedback_123_mic); + setDefaultBounds(m123MicPreviewIcon); + sSpacebarVerticalCorrection = res.getDimensionPixelOffset( + R.dimen.spacebar_vertical_correction); + mIsAlphaKeyboard = xmlLayoutResId == R.xml.kbd_qwerty; + mSpaceKeyIndex = indexOf((int) ' '); + } + + public LatinKeyboard(Context context, int layoutTemplateResId, + CharSequence characters, int columns, int horizontalPadding) { + super(context, layoutTemplateResId, characters, columns, horizontalPadding); + } + + @Override + protected Key createKeyFromXml(Resources res, Row parent, int x, int y, + XmlResourceParser parser) { + Key key = new LatinKey(res, parent, x, y, parser); + switch (key.codes[0]) { + case 10: + mEnterKey = key; + break; + case LatinKeyboardView.KEYCODE_F1: + mF1Key = key; + break; + case 32: + mSpaceKey = key; + break; + case KEYCODE_MODE_CHANGE: + m123Key = key; + m123Label = key.label; + break; + } + return key; + } + + void setImeOptions(Resources res, int mode, int options) { + if (mEnterKey != null) { + // Reset some of the rarely used attributes. + mEnterKey.popupCharacters = null; + mEnterKey.popupResId = 0; + mEnterKey.text = null; + switch (options&(EditorInfo.IME_MASK_ACTION|EditorInfo.IME_FLAG_NO_ENTER_ACTION)) { + case EditorInfo.IME_ACTION_GO: + mEnterKey.iconPreview = null; + mEnterKey.icon = null; + mEnterKey.label = res.getText(R.string.label_go_key); + break; + case EditorInfo.IME_ACTION_NEXT: + mEnterKey.iconPreview = null; + mEnterKey.icon = null; + mEnterKey.label = res.getText(R.string.label_next_key); + break; + case EditorInfo.IME_ACTION_DONE: + mEnterKey.iconPreview = null; + mEnterKey.icon = null; + mEnterKey.label = res.getText(R.string.label_done_key); + break; + case EditorInfo.IME_ACTION_SEARCH: + mEnterKey.iconPreview = res.getDrawable( + R.drawable.sym_keyboard_feedback_search); + mEnterKey.icon = res.getDrawable( + R.drawable.sym_keyboard_search); + mEnterKey.label = null; + break; + case EditorInfo.IME_ACTION_SEND: + mEnterKey.iconPreview = null; + mEnterKey.icon = null; + mEnterKey.label = res.getText(R.string.label_send_key); + break; + default: + if (mode == KeyboardSwitcher.MODE_IM) { + mEnterKey.icon = null; + mEnterKey.iconPreview = null; + mEnterKey.label = ":-)"; + mEnterKey.text = ":-) "; + mEnterKey.popupResId = R.xml.popup_smileys; + } else { + mEnterKey.iconPreview = res.getDrawable( + R.drawable.sym_keyboard_feedback_return); + mEnterKey.icon = res.getDrawable( + R.drawable.sym_keyboard_return); + mEnterKey.label = null; + } + break; + } + // Set the initial size of the preview icon + if (mEnterKey.iconPreview != null) { + mEnterKey.iconPreview.setBounds(0, 0, + mEnterKey.iconPreview.getIntrinsicWidth(), + mEnterKey.iconPreview.getIntrinsicHeight()); + } + } + } + + void enableShiftLock() { + int index = getShiftKeyIndex(); + if (index >= 0) { + mShiftKey = getKeys().get(index); + if (mShiftKey instanceof LatinKey) { + ((LatinKey)mShiftKey).enableShiftLock(); + } + mOldShiftIcon = mShiftKey.icon; + mOldShiftPreviewIcon = mShiftKey.iconPreview; + } + } + + void setShiftLocked(boolean shiftLocked) { + if (mShiftKey != null) { + if (shiftLocked) { + mShiftKey.on = true; + mShiftKey.icon = mShiftLockIcon; + mShiftState = SHIFT_LOCKED; + } else { + mShiftKey.on = false; + mShiftKey.icon = mShiftLockIcon; + mShiftState = SHIFT_ON; + } + } + } + + boolean isShiftLocked() { + return mShiftState == SHIFT_LOCKED; + } + + @Override + public boolean setShifted(boolean shiftState) { + boolean shiftChanged = false; + if (mShiftKey != null) { + if (shiftState == false) { + shiftChanged = mShiftState != SHIFT_OFF; + mShiftState = SHIFT_OFF; + mShiftKey.on = false; + mShiftKey.icon = mOldShiftIcon; + } else { + if (mShiftState == SHIFT_OFF) { + shiftChanged = mShiftState == SHIFT_OFF; + mShiftState = SHIFT_ON; + mShiftKey.icon = mShiftLockIcon; + } + } + } else { + return super.setShifted(shiftState); + } + return shiftChanged; + } + + @Override + public boolean isShifted() { + if (mShiftKey != null) { + return mShiftState != SHIFT_OFF; + } else { + return super.isShifted(); + } + } + + public void setExtension(int resId) { + mExtensionResId = resId; + } + + public int getExtension() { + return mExtensionResId; + } + + private void setDefaultBounds(Drawable drawable) { + drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight()); + } + + public void setVoiceMode(boolean hasVoiceButton, boolean hasVoice) { + mHasVoiceButton = hasVoiceButton; + mVoiceEnabled = hasVoice; + updateF1Key(); + } + + private void updateF1Key() { + if (mF1Key == null) return; + if (m123Key != null && mIsAlphaKeyboard) { + if (mVoiceEnabled && !mHasVoiceButton) { + m123Key.icon = m123MicIcon; + m123Key.iconPreview = m123MicPreviewIcon; + m123Key.label = null; + } else { + m123Key.icon = null; + m123Key.iconPreview = null; + m123Key.label = m123Label; + } + } + + if (mHasVoiceButton && mVoiceEnabled) { + mF1Key.codes = new int[] { LatinKeyboardView.KEYCODE_VOICE }; + mF1Key.label = null; + mF1Key.icon = mMicIcon; + mF1Key.iconPreview = mMicPreviewIcon; + } else { + mF1Key.label = ","; + mF1Key.codes = new int[] { ',' }; + mF1Key.icon = null; + mF1Key.iconPreview = null; + } + } + + private void updateSpaceBarForLocale() { + if (mLocale != null) { + // Create the graphic for spacebar + Bitmap buffer = Bitmap.createBitmap(mSpaceKey.width, mSpaceIcon.getIntrinsicHeight(), + Bitmap.Config.ARGB_8888); + Canvas canvas = new Canvas(buffer); + drawSpaceBar(canvas, buffer.getWidth(), buffer.getHeight(), 255); + mSpaceKey.icon = new BitmapDrawable(mRes, buffer); + mSpaceKey.repeatable = mLanguageSwitcher.getLocaleCount() < 2; + } else { + mSpaceKey.icon = mRes.getDrawable(R.drawable.sym_keyboard_space); + mSpaceKey.repeatable = true; + } + } + + private void drawSpaceBar(Canvas canvas, int width, int height, int opacity) { + canvas.drawColor(0x00000000, PorterDuff.Mode.CLEAR); + Paint paint = new Paint(); + paint.setAntiAlias(true); + paint.setAlpha(opacity); + // Get the text size from the theme + paint.setTextSize(getTextSizeFromTheme(android.R.style.TextAppearance_Small, 14)); + paint.setTextAlign(Align.CENTER); + //// Draw a drop shadow for the text + //paint.setShadowLayer(2f, 0, 0, 0xFF000000); + final String language = getInputLanguage(mSpaceKey.width, paint); + final int ascent = (int) -paint.ascent(); + paint.setColor(0x80000000); + canvas.drawText(language, + width / 2, ascent - 1, paint); + paint.setColor(0xFF808080); + canvas.drawText(language, + width / 2, ascent, paint); + // Put arrows on either side of the text + if (mLanguageSwitcher.getLocaleCount() > 1) { + Rect bounds = new Rect(); + paint.getTextBounds(language, 0, language.length(), bounds); + drawButtonArrow(mButtonArrowLeftIcon, canvas, + (mSpaceKey.width - bounds.right) / 2 + - mButtonArrowLeftIcon.getIntrinsicWidth(), + (int) paint.getTextSize()); + drawButtonArrow(mButtonArrowRightIcon, canvas, + (mSpaceKey.width + bounds.right) / 2, (int) paint.getTextSize()); + } + // Draw the spacebar icon at the bottom + int x = (width - mSpaceIcon.getIntrinsicWidth()) / 2; + int y = height - mSpaceIcon.getIntrinsicHeight(); + mSpaceIcon.setBounds(x, y, + x + mSpaceIcon.getIntrinsicWidth(), y + mSpaceIcon.getIntrinsicHeight()); + mSpaceIcon.draw(canvas); + } + + private void drawButtonArrow(Drawable arrow, Canvas canvas, int x, int bottomY) { + arrow.setBounds(x, bottomY - arrow.getIntrinsicHeight(), x + arrow.getIntrinsicWidth(), + bottomY); + arrow.draw(canvas); + } + + private String getInputLanguage(int widthAvail, Paint paint) { + return chooseDisplayName(mLanguageSwitcher.getInputLocale(), widthAvail, paint); + } + + private String getNextInputLanguage(int widthAvail, Paint paint) { + return chooseDisplayName(mLanguageSwitcher.getNextInputLocale(), widthAvail, paint); + } + + private String getPrevInputLanguage(int widthAvail, Paint paint) { + return chooseDisplayName(mLanguageSwitcher.getPrevInputLocale(), widthAvail, paint); + } + + private String chooseDisplayName(Locale locale, int widthAvail, Paint paint) { + if (widthAvail < (int) (.35 * getMinWidth())) { + return LanguageSwitcher.toTitleCase(locale.getLanguage().substring(0, 2)); + } else { + return LanguageSwitcher.toTitleCase(locale.getDisplayLanguage(locale)); + } + } + + private void updateLocaleDrag(int diff) { + if (mSlidingLocaleIcon == null) { + mSlidingLocaleIcon = new SlidingLocaleDrawable(mSpacePreviewIcon, mSpaceKey.width, + mSpacePreviewIcon.getIntrinsicHeight()); + mSlidingLocaleIcon.setBounds(0, 0, mSpaceKey.width, + mSpacePreviewIcon.getIntrinsicHeight()); + mSpaceKey.iconPreview = mSlidingLocaleIcon; + } + mSlidingLocaleIcon.setDiff(diff); + if (Math.abs(diff) == Integer.MAX_VALUE) { + mSpaceKey.iconPreview = mSpacePreviewIcon; + } else { + mSpaceKey.iconPreview = mSlidingLocaleIcon; + } + mSpaceKey.iconPreview.invalidateSelf(); + } + + public int getLanguageChangeDirection() { + if (mSpaceKey == null || mLanguageSwitcher.getLocaleCount() < 2 + || Math.abs(mSpaceDragLastDiff) < mSpaceKey.width * SPACEBAR_DRAG_THRESHOLD ) { + return 0; // No change + } + return mSpaceDragLastDiff > 0 ? 1 : -1; + } + + public void setLanguageSwitcher(LanguageSwitcher switcher) { + mLanguageSwitcher = switcher; + Locale locale = mLanguageSwitcher.getLocaleCount() > 0 + ? mLanguageSwitcher.getInputLocale() + : null; + if (mLocale != null && mLocale.equals(locale)) return; + mLocale = locale; + updateSpaceBarForLocale(); + } + + boolean isCurrentlyInSpace() { + return mCurrentlyInSpace; + } + + void setPreferredLetters(int[] frequencies) { + mPrefLetterFrequencies = frequencies; + mPrefLetter = 0; + } + + void keyReleased() { + mCurrentlyInSpace = false; + mSpaceDragLastDiff = 0; + mPrefLetter = 0; + mPrefLetterX = 0; + mPrefLetterY = 0; + mPrefDistance = Integer.MAX_VALUE; + if (mSpaceKey != null) { + updateLocaleDrag(Integer.MAX_VALUE); + } + } + + /** + * Does the magic of locking the touch gesture into the spacebar when + * switching input languages. + */ + boolean isInside(LatinKey key, int x, int y) { + final int code = key.codes[0]; + if (code == KEYCODE_SHIFT || + code == KEYCODE_DELETE) { + y -= key.height / 10; + if (code == KEYCODE_SHIFT) x += key.width / 6; + if (code == KEYCODE_DELETE) x -= key.width / 6; + } else if (code == LatinIME.KEYCODE_SPACE) { + y += LatinKeyboard.sSpacebarVerticalCorrection; + if (mLanguageSwitcher.getLocaleCount() > 1) { + if (mCurrentlyInSpace) { + int diff = x - mSpaceDragStartX; + if (Math.abs(diff - mSpaceDragLastDiff) > 0) { + updateLocaleDrag(diff); + } + mSpaceDragLastDiff = diff; + return true; + } else { + boolean insideSpace = key.isInsideSuper(x, y); + if (insideSpace) { + mCurrentlyInSpace = true; + mSpaceDragStartX = x; + updateLocaleDrag(0); + } + return insideSpace; + } + } + } else if (mPrefLetterFrequencies != null) { + // New coordinate? Reset + if (mPrefLetterX != x || mPrefLetterY != y) { + mPrefLetter = 0; + mPrefDistance = Integer.MAX_VALUE; + } + // Handle preferred next letter + final int[] pref = mPrefLetterFrequencies; + if (mPrefLetter > 0) { + if (DEBUG_PREFERRED_LETTER && mPrefLetter == code + && !key.isInsideSuper(x, y)) { + Log.d(TAG, "CORRECTED !!!!!!"); + } + return mPrefLetter == code; + } else { + final boolean inside = key.isInsideSuper(x, y); + int[] nearby = getNearestKeys(x, y); + List<Key> nearbyKeys = getKeys(); + if (inside) { + // If it's a preferred letter + if (inPrefList(code, pref)) { + // Check if its frequency is much lower than a nearby key + mPrefLetter = code; + mPrefLetterX = x; + mPrefLetterY = y; + for (int i = 0; i < nearby.length; i++) { + Key k = nearbyKeys.get(nearby[i]); + if (k != key && inPrefList(k.codes[0], pref)) { + final int dist = distanceFrom(k, x, y); + if (dist < (int) (k.width * OVERLAP_PERCENTAGE_LOW_PROB) && + (pref[k.codes[0]] > pref[mPrefLetter] * 3)) { + mPrefLetter = k.codes[0]; + mPrefDistance = dist; + if (DEBUG_PREFERRED_LETTER) { + Log.d(TAG, "CORRECTED ALTHOUGH PREFERRED !!!!!!"); + } + break; + } + } + } + + return mPrefLetter == code; + } + } + + // Get the surrounding keys and intersect with the preferred list + // For all in the intersection + // if distance from touch point is within a reasonable distance + // make this the pref letter + // If no pref letter + // return inside; + // else return thiskey == prefletter; + + for (int i = 0; i < nearby.length; i++) { + Key k = nearbyKeys.get(nearby[i]); + if (inPrefList(k.codes[0], pref)) { + final int dist = distanceFrom(k, x, y); + if (dist < (int) (k.width * OVERLAP_PERCENTAGE_HIGH_PROB) + && dist < mPrefDistance) { + mPrefLetter = k.codes[0]; + mPrefLetterX = x; + mPrefLetterY = y; + mPrefDistance = dist; + } + } + } + // Didn't find any + if (mPrefLetter == 0) { + return inside; + } else { + return mPrefLetter == code; + } + } + } + + // Lock into the spacebar + if (mCurrentlyInSpace) return false; + + return key.isInsideSuper(x, y); + } + + private boolean inPrefList(int code, int[] pref) { + if (code < pref.length && code >= 0) return pref[code] > 0; + return false; + } + + private int distanceFrom(Key k, int x, int y) { + if (y > k.y && y < k.y + k.height) { + return Math.abs(k.x + k.width / 2 - x); + } else { + return Integer.MAX_VALUE; + } + } + + @Override + public int[] getNearestKeys(int x, int y) { + if (mCurrentlyInSpace) { + return new int[] { mSpaceKeyIndex }; + } else { + return super.getNearestKeys(x, y); + } + } + + private int indexOf(int code) { + List<Key> keys = getKeys(); + int count = keys.size(); + for (int i = 0; i < count; i++) { + if (keys.get(i).codes[0] == code) return i; + } + return -1; + } + + private int getTextSizeFromTheme(int style, int defValue) { + TypedArray array = mContext.getTheme().obtainStyledAttributes( + style, new int[] { android.R.attr.textSize }); + int textSize = array.getDimensionPixelSize(array.getResourceId(0, 0), defValue); + return textSize; + } + + class LatinKey extends Keyboard.Key { + + private boolean mShiftLockEnabled; + + public LatinKey(Resources res, Keyboard.Row parent, int x, int y, + XmlResourceParser parser) { + super(res, parent, x, y, parser); + if (popupCharacters != null && popupCharacters.length() == 0) { + // If there is a keyboard with no keys specified in popupCharacters + popupResId = 0; + } + } + + void enableShiftLock() { + mShiftLockEnabled = true; + } + + @Override + public void onReleased(boolean inside) { + if (!mShiftLockEnabled) { + super.onReleased(inside); + } else { + pressed = !pressed; + } + } + + /** + * Overriding this method so that we can reduce the target area for certain keys. + */ + @Override + public boolean isInside(int x, int y) { + boolean result = LatinKeyboard.this.isInside(this, x, y); + return result; + } + + boolean isInsideSuper(int x, int y) { + return super.isInside(x, y); + } + } + + /** + * Animation to be displayed on the spacebar preview popup when switching + * languages by swiping the spacebar. It draws the current, previous and + * next languages and moves them by the delta of touch movement on the spacebar. + */ + class SlidingLocaleDrawable extends Drawable { + + private int mWidth; + private int mHeight; + private Drawable mBackground; + private int mDiff; + private TextPaint mTextPaint; + private int mMiddleX; + private int mAscent; + private Drawable mLeftDrawable; + private Drawable mRightDrawable; + private boolean mHitThreshold; + private int mThreshold; + private String mCurrentLanguage; + private String mNextLanguage; + private String mPrevLanguage; + + public SlidingLocaleDrawable(Drawable background, int width, int height) { + mBackground = background; + mBackground.setBounds(0, 0, + mBackground.getIntrinsicWidth(), mBackground.getIntrinsicHeight()); + mWidth = width; + mHeight = height; + mTextPaint = new TextPaint(); + int textSize = getTextSizeFromTheme(android.R.style.TextAppearance_Medium, 18); + mTextPaint.setTextSize(textSize); + mTextPaint.setColor(0); + mTextPaint.setTextAlign(Align.CENTER); + mTextPaint.setAlpha(255); + mTextPaint.setAntiAlias(true); + mAscent = (int) mTextPaint.ascent(); + mMiddleX = (mWidth - mBackground.getIntrinsicWidth()) / 2; + mLeftDrawable = + mRes.getDrawable(R.drawable.sym_keyboard_feedback_language_arrows_left); + mRightDrawable = + mRes.getDrawable(R.drawable.sym_keyboard_feedback_language_arrows_right); + mLeftDrawable.setBounds(0, 0, + mLeftDrawable.getIntrinsicWidth(), mLeftDrawable.getIntrinsicHeight()); + mRightDrawable.setBounds(mWidth - mRightDrawable.getIntrinsicWidth(), 0, + mWidth, mRightDrawable.getIntrinsicHeight()); + mThreshold = ViewConfiguration.get(mContext).getScaledTouchSlop(); + } + + void setDiff(int diff) { + if (diff == Integer.MAX_VALUE) { + mHitThreshold = false; + mCurrentLanguage = null; + return; + } + mDiff = diff; + if (mDiff > mWidth) mDiff = mWidth; + if (mDiff < -mWidth) mDiff = -mWidth; + if (Math.abs(mDiff) > mThreshold) mHitThreshold = true; + invalidateSelf(); + } + + @Override + public void draw(Canvas canvas) { + canvas.save(); + if (mHitThreshold) { + mTextPaint.setColor(0xFF000000); + canvas.clipRect(0, 0, mWidth, mHeight); + if (mCurrentLanguage == null) { + mCurrentLanguage = getInputLanguage(mWidth, mTextPaint); + mNextLanguage = getNextInputLanguage(mWidth, mTextPaint); + mPrevLanguage = getPrevInputLanguage(mWidth, mTextPaint); + } + canvas.drawText(mCurrentLanguage, + mWidth / 2 + mDiff, -mAscent + 4, mTextPaint); + canvas.drawText(mNextLanguage, + mDiff - mWidth / 2, -mAscent + 4, mTextPaint); + canvas.drawText(mPrevLanguage, + mDiff + mWidth + mWidth / 2, -mAscent + 4, mTextPaint); + mLeftDrawable.draw(canvas); + mRightDrawable.draw(canvas); + } + if (mBackground != null) { + canvas.translate(mMiddleX, 0); + mBackground.draw(canvas); + } + canvas.restore(); + } + + @Override + public int getOpacity() { + return PixelFormat.TRANSLUCENT; + } + + @Override + public void setAlpha(int alpha) { + // Ignore + } + + @Override + public void setColorFilter(ColorFilter cf) { + // Ignore + } + + @Override + public int getIntrinsicWidth() { + return mWidth; + } + + @Override + public int getIntrinsicHeight() { + return mHeight; + } + } +} |