Android使用xml自定義軟鍵盤效果(附原始碼)
阿新 • • 發佈:2019-02-20
Android使用xml自定義軟鍵盤效果原理:
1,軟鍵盤其實是個控制元件,使用android.inputmethodserver.KeyboardView類定義。
2,主佈局中使用幀佈局,當我們需要顯示軟鍵盤時設定為可見,不需要時設定為不可見。
3,編寫xml檔案,定義鍵盤內容。使用xml檔案填充KeyBoardView佈局
4,設定EditText的監聽事件。
完成鍵盤開發。
上效果圖:
1,原始碼研究android.inputmethodserver.KeyboardView:
/*
* 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 android.inputmethodservice;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.Paint.Align;
import android.graphics.Region.Op;
import android.graphics.drawable.Drawable;
import android.inputmethodservice.Keyboard.Key;
import android.media.AudioManager;
import android.os.Handler;
import android.os.Message;
import android.provider.Settings;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.GestureDetector;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup.LayoutParams;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import android.widget.PopupWindow;
import android.widget.TextView;
import com.android.internal.R;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* A view that renders a virtual {@link Keyboard}. It handles rendering of keys and
* detecting key presses and touch movements.
*
* @attr ref android.R.styleable#KeyboardView_keyBackground
* @attr ref android.R.styleable#KeyboardView_keyPreviewLayout
* @attr ref android.R.styleable#KeyboardView_keyPreviewOffset
* @attr ref android.R.styleable#KeyboardView_labelTextSize
* @attr ref android.R.styleable#KeyboardView_keyTextSize
* @attr ref android.R.styleable#KeyboardView_keyTextColor
* @attr ref android.R.styleable#KeyboardView_verticalCorrection
* @attr ref android.R.styleable#KeyboardView_popupLayout
*/
public class KeyboardView extends View implements View.OnClickListener {
/**
* Listener for virtual keyboard events.
*/
public interface OnKeyboardActionListener {
/**
* Called when the user presses a key. This is sent before the {@link #onKey} is called.
* For keys that repeat, this is only called once.
* @param primaryCode the unicode of the key being pressed. If the touch is not on a valid
* key, the value will be zero.
*/
void onPress(int primaryCode);
/**
* Called when the user releases a key. This is sent after the {@link #onKey} is called.
* For keys that repeat, this is only called once.
* @param primaryCode the code of the key that was released
*/
void onRelease(int primaryCode);
/**
* Send a key press to the listener.
* @param primaryCode this is the key that was pressed
* @param keyCodes the codes for all the possible alternative keys
* with the primary code being the first. If the primary key code is
* a single character such as an alphabet or number or symbol, the alternatives
* will include other characters that may be on the same key or adjacent keys.
* These codes are useful to correct for accidental presses of a key adjacent to
* the intended key.
*/
void onKey(int primaryCode, int[] keyCodes);
/**
* Sends a sequence of characters to the listener.
* @param text the sequence of characters to be displayed.
*/
void onText(CharSequence text);
/**
* Called when the user quickly moves the finger from right to left.
*/
void swipeLeft();
/**
* Called when the user quickly moves the finger from left to right.
*/
void swipeRight();
/**
* Called when the user quickly moves the finger from up to down.
*/
void swipeDown();
/**
* Called when the user quickly moves the finger from down to up.
*/
void swipeUp();
}
private static final boolean DEBUG = false;
private static final int NOT_A_KEY = -1;
private static final int[] KEY_DELETE = { Keyboard.KEYCODE_DELETE };
private static final int[] LONG_PRESSABLE_STATE_SET = { R.attr.state_long_pressable };
private Keyboard mKeyboard;
private int mCurrentKeyIndex = NOT_A_KEY;
private int mLabelTextSize;
private int mKeyTextSize;
private int mKeyTextColor;
private float mShadowRadius;
private int mShadowColor;
private float mBackgroundDimAmount;
private TextView mPreviewText;
private PopupWindow mPreviewPopup;
private int mPreviewTextSizeLarge;
private int mPreviewOffset;
private int mPreviewHeight;
// Working variable
private final int[] mCoordinates = new int[2];
private PopupWindow mPopupKeyboard;
private View mMiniKeyboardContainer;
private KeyboardView mMiniKeyboard;
private boolean mMiniKeyboardOnScreen;
private View mPopupParent;
private int mMiniKeyboardOffsetX;
private int mMiniKeyboardOffsetY;
private Map<Key,View> mMiniKeyboardCache;
private Key[] mKeys;
/** Listener for {@link OnKeyboardActionListener}. */
private OnKeyboardActionListener mKeyboardActionListener;
private static final int MSG_SHOW_PREVIEW = 1;
private static final int MSG_REMOVE_PREVIEW = 2;
private static final int MSG_REPEAT = 3;
private static final int MSG_LONGPRESS = 4;
private static final int DELAY_BEFORE_PREVIEW = 0;
private static final int DELAY_AFTER_PREVIEW = 70;
private static final int DEBOUNCE_TIME = 70;
private int mVerticalCorrection;
private int mProximityThreshold;
private boolean mPreviewCentered = false;
private boolean mShowPreview = true;
private boolean mShowTouchPoints = true;
private int mPopupPreviewX;
private int mPopupPreviewY;
private int mLastX;
private int mLastY;
private int mStartX;
private int mStartY;
private boolean mProximityCorrectOn;
private Paint mPaint;
private Rect mPadding;
private long mDownTime;
private long mLastMoveTime;
private int mLastKey;
private int mLastCodeX;
private int mLastCodeY;
private int mCurrentKey = NOT_A_KEY;
private int mDownKey = NOT_A_KEY;
private long mLastKeyTime;
private long mCurrentKeyTime;
private int[] mKeyIndices = new int[12];
private GestureDetector mGestureDetector;
private int mPopupX;
private int mPopupY;
private int mRepeatKeyIndex = NOT_A_KEY;
private int mPopupLayout;
private boolean mAbortKey;
private Key mInvalidatedKey;
private Rect mClipRegion = new Rect(0, 0, 0, 0);
private boolean mPossiblePoly;
private SwipeTracker mSwipeTracker = new SwipeTracker();
private int mSwipeThreshold;
private boolean mDisambiguateSwipe;
// Variables for dealing with multiple pointers
private int mOldPointerCount = 1;
private float mOldPointerX;
private float mOldPointerY;
private Drawable mKeyBackground;
private static final int REPEAT_INTERVAL = 50; // ~20 keys per second
private static final int REPEAT_START_DELAY = 400;
private static final int LONGPRESS_TIMEOUT = ViewConfiguration.getLongPressTimeout();
private static int MAX_NEARBY_KEYS = 12;
private int[] mDistances = new int[MAX_NEARBY_KEYS];
// For multi-tap
private int mLastSentIndex;
private int mTapCount;
private long mLastTapTime;
private boolean mInMultiTap;
private static final int MULTITAP_INTERVAL = 800; // milliseconds
private StringBuilder mPreviewLabel = new StringBuilder(1);
/** Whether the keyboard bitmap needs to be redrawn before it's blitted. **/
private boolean mDrawPending;
/** The dirty region in the keyboard bitmap */
private Rect mDirtyRect = new Rect();
/** The keyboard bitmap for faster updates */
private Bitmap mBuffer;
/** Notes if the keyboard just changed, so that we could possibly reallocate the mBuffer. */
private boolean mKeyboardChanged;
/** The canvas for the above mutable keyboard bitmap */
private Canvas mCanvas;
/** The accessibility manager for accessibility support */
private AccessibilityManager mAccessibilityManager;
/** The audio manager for accessibility support */
private AudioManager mAudioManager;
/** Whether the requirement of a headset to hear passwords if accessibility is enabled is announced. */
private boolean mHeadsetRequiredToHearPasswordsAnnounced;
Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_SHOW_PREVIEW:
showKey(msg.arg1);
break;
case MSG_REMOVE_PREVIEW:
mPreviewText.setVisibility(INVISIBLE);
break;
case MSG_REPEAT:
if (repeatKey()) {
Message repeat = Message.obtain(this, MSG_REPEAT);
sendMessageDelayed(repeat, REPEAT_INTERVAL);
}
break;
case MSG_LONGPRESS:
openPopupIfRequired((MotionEvent) msg.obj);
break;
}
}
};
public KeyboardView(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.keyboardViewStyle);
}
public KeyboardView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a =
context.obtainStyledAttributes(
attrs, android.R.styleable.KeyboardView, defStyle, 0);
LayoutInflater inflate =
(LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int previewLayout = 0;
int keyTextSize = 0;
int n = a.getIndexCount();
for (int i = 0; i < n; i++) {
int attr = a.getIndex(i);
switch (attr) {
case com.android.internal.R.styleable.KeyboardView_keyBackground:
mKeyBackground = a.getDrawable(attr);
break;
case com.android.internal.R.styleable.KeyboardView_verticalCorrection:
mVerticalCorrection = a.getDimensionPixelOffset(attr, 0);
break;
case com.android.internal.R.styleable.KeyboardView_keyPreviewLayout:
previewLayout = a.getResourceId(attr, 0);
break;
case com.android.internal.R.styleable.KeyboardView_keyPreviewOffset:
mPreviewOffset = a.getDimensionPixelOffset(attr, 0);
break;
case com.android.internal.R.styleable.KeyboardView_keyPreviewHeight:
mPreviewHeight = a.getDimensionPixelSize(attr, 80);
break;
case com.android.internal.R.styleable.KeyboardView_keyTextSize:
mKeyTextSize = a.getDimensionPixelSize(attr, 18);
break;
case com.android.internal.R.styleable.KeyboardView_keyTextColor:
mKeyTextColor = a.getColor(attr, 0xFF000000);
break;
case com.android.internal.R.styleable.KeyboardView_labelTextSize:
mLabelTextSize = a.getDimensionPixelSize(attr, 14);
break;
case com.android.internal.R.styleable.KeyboardView_popupLayout:
mPopupLayout = a.getResourceId(attr, 0);
break;
case com.android.internal.R.styleable.KeyboardView_shadowColor:
mShadowColor = a.getColor(attr, 0);
break;
case com.android.internal.R.styleable.KeyboardView_shadowRadius:
mShadowRadius = a.getFloat(attr, 0f);
break;
}
}
a = mContext.obtainStyledAttributes(
com.android.internal.R.styleable.Theme);
mBackgroundDimAmount = a.getFloat(android.R.styleable.Theme_backgroundDimAmount, 0.5f);
mPreviewPopup = new PopupWindow(context);
if (previewLayout != 0) {
mPreviewText = (TextView) inflate.inflate(previewLayout, null);
mPreviewTextSizeLarge = (int) mPreviewText.getTextSize();
mPreviewPopup.setContentView(mPreviewText);
mPreviewPopup.setBackgroundDrawable(null);
} else {
mShowPreview = false;
}
mPreviewPopup.setTouchable(false);
mPopupKeyboard = new PopupWindow(context);
mPopupKeyboard.setBackgroundDrawable(null);
//mPopupKeyboard.setClippingEnabled(false);
mPopupParent = this;
//mPredicting = true;
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setTextSize(keyTextSize);
mPaint.setTextAlign(Align.CENTER);
mPaint.setAlpha(255);
mPadding = new Rect(0, 0, 0, 0);
mMiniKeyboardCache = new HashMap<Key,View>();
mKeyBackground.getPadding(mPadding);
mSwipeThreshold = (int) (500 * getResources().getDisplayMetrics().density);
mDisambiguateSwipe = getResources().getBoolean(
com.android.internal.R.bool.config_swipeDisambiguation);
mAccessibilityManager = AccessibilityManager.getInstance(context);
mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
resetMultiTap();
initGestureDetector();
}
private void initGestureDetector() {
mGestureDetector = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onFling(MotionEvent me1, MotionEvent me2,
float velocityX, float velocityY) {
if (mPossiblePoly) return false;
final float absX = Math.abs(velocityX);
final float absY = Math.abs(velocityY);
float deltaX = me2.getX() - me1.getX();
float deltaY = me2.getY() - me1.getY();
int travelX = getWidth() / 2; // Half the keyboard width
int travelY = getHeight() / 2; // Half the keyboard height
mSwipeTracker.computeCurrentVelocity(1000);
final float endingVelocityX = mSwipeTracker.getXVelocity();
final float endingVelocityY = mSwipeTracker.getYVelocity();
boolean sendDownKey = false;
if (velocityX > mSwipeThreshold && absY < absX && deltaX > travelX) {
if (mDisambiguateSwipe && endingVelocityX < velocityX / 4) {
sendDownKey = true;
} else {
swipeRight();
return true;
}
} else if (velocityX < -mSwipeThreshold && absY < absX && deltaX < -travelX) {
if (mDisambiguateSwipe && endingVelocityX > velocityX / 4) {
sendDownKey = true;
} else {
swipeLeft();
return true;
}
} else if (velocityY < -mSwipeThreshold && absX < absY && deltaY < -travelY) {
if (mDisambiguateSwipe && endingVelocityY > velocityY / 4) {
sendDownKey = true;
} else {
swipeUp();
return true;
}
} else if (velocityY > mSwipeThreshold && absX < absY / 2 && deltaY > travelY) {
if (mDisambiguateSwipe && endingVelocityY < velocityY / 4) {
sendDownKey = true;
} else {
swipeDown();
return true;
}
}
if (sendDownKey) {
detectAndSendKey(mDownKey, mStartX, mStartY, me1.getEventTime());
}
return false;
}
});
mGestureDetector.setIsLongpressEnabled(false);
}
public void setOnKeyboardActionListener(OnKeyboardActionListener listener) {
mKeyboardActionListener = listener;
}
/**
* Returns the {@link OnKeyboardActionListener} object.
* @return the listener attached to this keyboard
*/
protected OnKeyboardActionListener getOnKeyboardActionListener() {
return mKeyboardActionListener;
}
/**
* Attaches a keyboard to this view. The keyboard can be switched at any time and the
* view will re-layout itself to accommodate the keyboard.
* @see Keyboard
* @see #getKeyboard()
* @param keyboard the keyboard to display in this view
*/
public void setKeyboard(Keyboard keyboard) {
if (mKeyboard != null) {
showPreview(NOT_A_KEY);
}
// Remove any pending messages
removeMessages();
mKeyboard = keyboard;
List<Key> keys = mKeyboard.getKeys();
mKeys = keys.toArray(new Key[keys.size()]);
requestLayout();
// Hint to reallocate the buffer if the size changed
mKeyboardChanged = true;
invalidateAllKeys();
computeProximityThreshold(keyboard);
mMiniKeyboardCache.clear(); // Not really necessary to do every time, but will free up views
// Switching to a different keyboard should abort any pending keys so that the key up
// doesn't get delivered to the old or new keyboard
mAbortKey = true; // Until the next ACTION_DOWN
}
/**
* Returns the current keyboard being displayed by this view.
* @return the currently attached keyboard
* @see #setKeyboard(Keyboard)
*/
public Keyboard getKeyboard() {
return mKeyboard;
}
/**
* Sets the state of the shift key of the keyboard, if any.
* @param shifted whether or not to enable the state of the shift key
* @return true if the shift key state changed, false if there was no change
* @see KeyboardView#isShifted()
*/
public boolean setShifted(boolean shifted) {
if (mKeyboard != null) {
if (mKeyboard.setShifted(shifted)) {
// The whole keyboard probably needs to be redrawn
invalidateAllKeys();
return true;
}
}
return false;
}
/**
* Returns the state of the shift key of the keyboard, if any.
* @return true if the shift is in a pressed state, false otherwise. If there is
* no shift key on the keyboard or there is no keyboard attached, it returns false.
* @see KeyboardView#setShifted(boolean)
*/
public boolean isShifted() {
if (mKeyboard != null) {
return mKeyboard.isShifted();
}
return false;
}
/**
* Enables or disables the key feedback popup. This is a popup that shows a magnified
* version of the depressed key. By default the preview is enabled.
* @param previewEnabled whether or not to enable the key feedback popup
* @see #isPreviewEnabled()
*/
public void setPreviewEnabled(boolean previewEnabled) {
mShowPreview = previewEnabled;
}
/**
* Returns the enabled state of the key feedback popup.
* @return whether or not the key feedback popup is enabled
* @see #setPreviewEnabled(boolean)
*/
public boolean isPreviewEnabled() {
return mShowPreview;
}
public void setVerticalCorrection(int verticalOffset) {
}
public void setPopupParent(View v) {
mPopupParent = v;
}
public void setPopupOffset(int x, int y) {
mMiniKeyboardOffsetX = x;
mMiniKeyboardOffsetY = y;
if (mPreviewPopup.isShowing()) {
mPreviewPopup.dismiss();
}
}
/**
* When enabled, calls to {@link OnKeyboardActionListener#onKey} will include key
* codes for adjacent keys. When disabled, only the primary key code will be
* reported.
* @param enabled whether or not the proximity correction is enabled
*/
public void setProximityCorrectionEnabled(boolean enabled) {
mProximityCorrectOn = enabled;
}
/**
* Returns true if proximity correction is enabled.
*/
public boolean isProximityCorrectionEnabled() {
return mProximityCorrectOn;
}
/**
* Popup keyboard close button clicked.
* @hide
*/
public void onClick(View v) {
dismissPopupKeyboard();
}
private CharSequence adjustCase(CharSequence label) {
if (mKeyboard.isShifted() && label != null && label.length() < 3
&& Character.isLowerCase(label.charAt(0))) {
label = label.toString().toUpperCase();
}
return label;
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// Round up a little
if (mKeyboard == null) {
setMeasuredDimension(mPaddingLeft + mPaddingRight, mPaddingTop + mPaddingBottom);
} else {
int width = mKeyboard.getMinWidth() + mPaddingLeft + mPaddingRight;
if (MeasureSpec.getSize(widthMeasureSpec) < width + 10) {
width = MeasureSpec.getSize(widthMeasureSpec);
}
setMeasuredDimension(width, mKeyboard.getHeight() + mPaddingTop + mPaddingBottom);
}
}
/**
* Compute the average distance between adjacent keys (horizontally and vertically)
* and square it to get the proximity threshold. We use a square here and in computing
* the touch distance from a key's center to avoid taking a square root.
* @param keyboard
*/
private void computeProximityThreshold(Keyboard keyboard) {
if (keyboard == null) return;
final Key[] keys = mKeys;
if (keys == null) return;
int length = keys.length;
int dimensionSum = 0;
for (int i = 0; i < length; i++) {
Key key = keys[i];
dimensionSum += Math.min(key.width, key.height) + key.gap;
}
if (dimensionSum < 0 || length == 0) return;
mProximityThreshold = (int) (dimensionSum * 1.4f / length);
mProximityThreshold *= mProximityThreshold; // Square it
}
@Override
public void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (mKeyboard != null) {
mKeyboard.resize(w, h);
}
// Release the buffer, if any and it will be reallocated on the next draw
mBuffer = null;
}
@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mDrawPending || mBuffer == null || mKeyboardChanged) {
onBufferDraw();
}
canvas.drawBitmap(mBuffer, 0, 0, null);
}
private void onBufferDraw() {
if (mBuffer == null || mKeyboardChanged) {
if (mBuffer == null || mKeyboardChanged &&
(mBuffer.getWidth() != getWidth() || mBuffer.getHeight() != getHeight())) {
// Make sure our bitmap is at least 1x1
final int width = Math.max(1, getWidth());
final int height = Math.max(1, getHeight());
mBuffer = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBuffer);
}
invalidateAllKeys();
mKeyboardChanged = false;
}
final Canvas canvas = mCanvas;
canvas.clipRect(mDirtyRect, Op.REPLACE);
if (mKeyboard == null) return;
final Paint paint = mPaint;
final Drawable keyBackground = mKeyBackground;
final Rect clipRegion = mClipRegion;
final Rect padding = mPadding;
final int kbdPaddingLeft = mPaddingLeft;
final int kbdPaddingTop = mPaddingTop;
final Key[] keys = mKeys;
final Key invalidKey = mInvalidatedKey;
paint.setColor(mKeyTextColor);
boolean drawSingleKey = false;
if (invalidKey != null && canvas.getClipBounds(clipRegion)) {
// Is clipRegion completely contained within the invalidated key?
if (invalidKey.x + kbdPaddingLeft - 1 <= clipRegion.left &&
invalidKey.y + kbdPaddingTop - 1 <= clipRegion.top &&
invalidKey.x + invalidKey.width + kbdPaddingLeft + 1 >= clipRegion.right &&
invalidKey.y + invalidKey.height + kbdPaddingTop + 1 >= clipRegion.bottom) {
drawSingleKey = true;
}
}
canvas.drawColor(0x00000000, PorterDuff.Mode.CLEAR);
final int keyCount = keys.length;
for (int i = 0; i < keyCount; i++) {
final Key key = keys[i];
if (drawSingleKey && invalidKey != key) {
continue;
}
int[] drawableState = key.getCurrentDrawableState();
keyBackground.setState(drawableState);
// Switch the character to uppercase if shift is pressed
String label = key.label == null? null : adjustCase(key.label).toString();
final Rect bounds = keyBackground.getBounds();
if (key.width != bounds.right ||
key.height != bounds.bottom) {
keyBackground.setBounds(0, 0, key.width, key.height);
}
canvas.translate(key.x + kbdPaddingLeft, key.y + kbdPaddingTop);
keyBackground.draw(canvas);
if (label != null) {
// For characters, use large font. For labels like "Done", use small font.
if (label.length() > 1 && key.codes.length < 2) {
paint.setTextSize(mLabelTextSize);
paint.setTypeface(Typeface.DEFAULT_BOLD);
} else {
paint.setTextSize(mKeyTextSize);
paint.setTypeface(Typeface.DEFAULT);
}
// Draw a drop shadow for the text
paint.setShadowLayer(mShadowRadius, 0, 0, mShadowColor);
// Draw the text
canvas.drawText(label,
(key.width - padding.left - padding.right) / 2
+ padding.left,
(key.height - padding.top - padding.bottom) / 2
+ (paint.getTextSize() - paint.descent()) / 2 + padding.top,
paint);
// Turn off drop shadow
paint.setShadowLayer(0, 0, 0, 0);
} else if (key.icon != null) {
final int drawableX = (key.width - padding.left - padding.right
- key.icon.getIntrinsicWidth()) / 2 + padding.left;
final int drawableY = (key.height - padding.top - padding.bottom
- key.icon.getIntrinsicHeight()) / 2 + padding.top;
canvas.translate(drawableX, drawableY);
key.icon.setBounds(0, 0,
key.icon.getIntrinsicWidth(), key.icon.getIntrinsicHeight());
key.icon.draw(canvas);
canvas.translate(-drawableX, -drawableY);
}
canvas.translate(-key.x - kbdPaddingLeft, -key.y - kbdPaddingTop);
}
mInvalidatedKey = null;
// Overlay a dark rectangle to dim the keyboard
if (mMiniKeyboardOnScreen) {
paint.setColor((int) (mBackgroundDimAmount * 0xFF) << 24);
canvas.drawRect(0, 0, getWidth(), getHeight(), paint);
}
if (DEBUG && mShowTouchPoints) {
paint.setAlpha(128);
paint.setColor(0xFFFF0000);
canvas.drawCircle(mStartX, mStartY, 3, paint);
canvas.drawLine(mStartX, mStartY, mLastX, mLastY, paint);
paint.setColor(0xFF0000FF);
canvas.drawCircle(mLastX, mLastY, 3, paint);
paint.setColor(0xFF00FF00);
canvas.drawCircle((mStartX + mLastX) / 2, (mStartY + mLastY) / 2, 2, paint);
}
mDrawPending = false;
mDirtyRect.setEmpty();
}
private int getKeyIndices(int x, int y, int[] allKeys) {
final Key[] keys = mKeys;
int primaryIndex = NOT_A_KEY;
int closestKey = NOT_A_KEY;
int closestKeyDist = mProximityThreshold + 1;
java.util.Arrays.fill(mDistances, Integer.MAX_VALUE);
int [] nearestKeyIndices = mKeyboard.getNearestKeys(x, y);
final int keyCount = nearestKeyIndices.length;
for (int i = 0; i < keyCount; i++) {
final Key key = keys[nearestKeyIndices[i]];
int dist = 0;
boolean isInside = key.isInside(x,y);
if (isInside) {
primaryIndex = nearestKeyIndices[i];
}
if (((mProximityCorrectOn
&& (dist = key.squaredDistanceFrom(x, y)) < mProximityThreshold)
|| isInside)
&& key.codes[0] > 32) {
// Find insertion point
final int nCodes = key.codes.length;
if (dist < closestKeyDist) {
closestKeyDist = dist;
closestKey = nearestKeyIndices[i];
}
if (allKeys == null) continue;
for (int j = 0; j < mDistances.length; j++) {
if (mDistances[j] > dist) {
// Make space for nCodes codes
System.arraycopy(mDistances, j, mDistances, j + nCodes,
mDistances.length - j - nCodes);
System.arraycopy(allKeys, j, allKeys, j + nCodes,
allKeys.length - j - nCodes);
for (int c = 0; c < nCodes; c++) {
allKeys[j + c] = key.codes[c];
mDistances[j + c] = dist;
}
break;
}
}
}
}
if (primaryIndex == NOT_A_KEY) {
primaryIndex = closestKey;
}
return primaryIndex;
}
private void detectAndSendKey(int index, int x, int y, long eventTime) {
if (index != NOT_A_KEY && index < mKeys.length) {
final Key key = mKeys[index];
if (key.text != null) {
mKeyboardActionListener.onText(key.text);
mKeyboardActionListener.onRelease(NOT_A_KEY);
} else {
int code = key.codes[0];
//TextEntryState.keyPressedAt(key, x, y);
int[] codes = new int[MAX_NEARBY_KEYS];
Arrays.fill(codes, NOT_A_KEY);
getKeyIndices(x, y, codes);
// Multi-tap
if (mInMultiTap) {
if (mTapCount != -1) {
mKeyboardActionListener.onKey(Keyboard.KEYCODE_DELETE, KEY_DELETE);
} else {
mTapCount = 0;
}
code = key.codes[mTapCount];
}
mKeyboardActionListener.onKey(code, codes);
mKeyboardActionListener.onRelease(code);
}
mLastSentIndex = index;
mLastTapTime = eventTime;
}
}
/**
* Handle multi-tap keys by producing the key label for the current multi-tap state.
*/
private CharSequence getPreviewText(Key key) {
if (mInMultiTap) {
// Multi-tap
mPreviewLabel.setLength(0);
mPreviewLabel.append((char) key.codes[mTapCount < 0 ? 0 : mTapCount]);
return adjustCase(mPreviewLabel);
} else {
return adjustCase(key.label);
}
}
private void showPreview(int keyIndex) {
int oldKeyIndex = mCurrentKeyIndex;
final PopupWindow previewPopup = mPreviewPopup;
mCurrentKeyIndex = keyIndex;
// Release the old key and press the new key
final Key[] keys = mKeys;
if (oldKeyIndex != mCurrentKeyIndex) {
if (oldKeyIndex != NOT_A_KEY && keys.length > oldKeyIndex) {
Key oldKey = keys[oldKeyIndex];
oldKey.onReleased(mCurrentKeyIndex == NOT_A_KEY);
invalidateKey(oldKeyIndex);
sendAccessibilityEventForUnicodeCharacter(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT,
oldKey.codes[0]);
}
if (mCurrentKeyIndex != NOT_A_KEY && keys.length > mCurrentKeyIndex) {
Key newKey = keys[mCurrentKeyIndex];
newKey.onPressed();
invalidateKey(mCurrentKeyIndex);
sendAccessibilityEventForUnicodeCharacter(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER,
newKey.codes[0]);
}
}
// If key changed and preview is on ...
if (oldKeyIndex != mCurrentKeyIndex && mShowPreview) {
mHandler.removeMessages(MSG_SHOW_PREVIEW);
if (previewPopup.isShowing()) {
if (keyIndex == NOT_A_KEY) {
mHandler.sendMessageDelayed(mHandler
.obtainMessage(MSG_REMOVE_PREVIEW),
DELAY_AFTER_PREVIEW);
}
}
if (keyIndex != NOT_A_KEY) {
if (previewPopup.isShowing() && mPreviewText.getVisibility() == VISIBLE) {
// Show right away, if it's already visible and finger is moving around
showKey(keyIndex);
} else {
mHandler.sendMessageDelayed(
mHandler.obtainMessage(MSG_SHOW_PREVIEW, keyIndex, 0),
DELAY_BEFORE_PREVIEW);
}
}
}
}
private void showKey(final int keyIndex) {
final PopupWindow previewPopup = mPreviewP