gesture手势识别Android源代码

/* * Copyright (C) 2009 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.gesture; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Path; import android.graphics.Rect; import android.graphics.RectF; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.animation.AnimationUtils; import android.view.animation.AccelerateDecelerateInterpolator; import android.widget.FrameLayout; import android.os.SystemClock; import android.annotation.Widget; import com.android.internal.R; import java.util.ArrayList; /** * A transparent overlay for gesture input that can be placed on top of other * widgets or contain other widgets. * * @attr ref android.R.styleable#GestureOverlayView_eventsInterceptionEnabled * @attr ref android.R.styleable#GestureOverlayView_fadeDuration * @attr ref android.R.styleable#GestureOverlayView_fadeOffset * @attr ref android.R.styleable#GestureOverlayView_fadeEnabled * @attr ref android.R.styleable#GestureOverlayView_gestureStrokeWidth * @attr ref android.R.styleable#GestureOverlayView_gestureStrokeAngleThreshold * @attr ref android.R.styleable#GestureOverlayView_gestureStrokeLengthThreshold * @attr ref android.R.styleable#GestureOverlayView_gestureStrokeSquarenessThreshold * @attr ref android.R.styleable#GestureOverlayView_gestureStrokeType * @attr ref android.R.styleable#GestureOverlayView_gestureColor * @attr ref android.R.styleable#GestureOverlayView_orientation * @attr ref android.R.styleable#GestureOverlayView_uncertainGestureColor */ @Widget public class GestureOverlayView extends FrameLayout { public static final int GESTURE_STROKE_TYPE_SINGLE = 0; public static final int GESTURE_STROKE_TYPE_MULTIPLE = 1; public static final int ORIENTATION_HORIZONTAL = 0; public static final int ORIENTATION_VERTICAL = 1; private static final int FADE_ANIMATION_RATE = 16; private static final boolean GESTURE_RENDERING_ANTIALIAS = true; private static final boolean DITHER_FLAG = true; private final Paint mGesturePaint = new Paint(); private long mFadeDuration = 150; private long mFadeOffset = 420; private long mFadingStart; private boolean mFadingHasStarted; private boolean mFadeEnabled = true; private int mCurrentColor; private int mCertainGestureColor = 0xFFFFFF00; private int mUncertainGestureColor = 0x48FFFF00; private float mGestureStrokeWidth = 12.0f; private int mInvalidateExtraBorder = 10; private int mGestureStrokeType = GESTURE_STROKE_TYPE_SINGLE; private float mGestureStrokeLengthThreshold = 50.0f; private float mGestureStrokeSquarenessTreshold = 0.275f; private float mGestureStrokeAngleThreshold = 40.0f; private int mOrientation = ORIENTATION_VERTICAL; private final Rect mInvalidRect = new Rect(); private final Path mPath = new Path(); private boolean mGestureVisible = true; private float mX; private float mY; private float mCurveEndX; private float mCurveEndY; private float mTotalLength; private boolean mIsGesturing = false; private boolean mPreviousWasGesturing = false; private boolean mInterceptEvents = true; private boolean mIsListeningForGestures; private boolean mResetGesture; // current gesture private Gesture mCurrentGesture; private final ArrayList<GesturePoint> mStrokeBuffer = new ArrayList<GesturePoint>(100); // TODO: Make this a list of WeakReferences private final ArrayList<OnGestureListener> mOnGestureListeners = new ArrayList<OnGestureListener>(); // TODO: Make this a list of WeakReferences private final ArrayList<OnGesturePerformedListener> mOnGesturePerformedListeners = new ArrayList<OnGesturePerformedListener>(); // TODO: Make this a list of WeakReferences private final ArrayList<OnGesturingListener> mOnGesturingListeners = new ArrayList<OnGesturingListener>(); private boolean mHandleGestureActions; // fading out effect private boolean mIsFadingOut = false; private float mFadingAlpha = 1.0f; private final AccelerateDecelerateInterpolator mInterpolator = new AccelerateDecelerateInterpolator(); private final FadeOutRunnable mFadingOut = new FadeOutRunnable(); public GestureOverlayView(Context context) { super(context); init(); } public GestureOverlayView(Context context, AttributeSet attrs) { this(context, attrs, com.android.internal.R.attr.gestureOverlayViewStyle); } public GestureOverlayView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.GestureOverlayView, defStyle, 0); mGestureStrokeWidth = a.getFloat(R.styleable.GestureOverlayView_gestureStrokeWidth, mGestureStrokeWidth); mInvalidateExtraBorder = Math.max(1, ((int) mGestureStrokeWidth) - 1); mCertainGestureColor = a.getColor(R.styleable.GestureOverlayView_gestureColor, mCertainGestureColor); mUncertainGestureColor = a.getColor(R.styleable.GestureOverlayView_uncertainGestureColor, mUncertainGestureColor); mFadeDuration = a.getInt(R.styleable.GestureOverlayView_fadeDuration, (int) mFadeDuration); mFadeOffset = a.getInt(R.styleable.GestureOverlayView_fadeOffset, (int) mFadeOffset); mGestureStrokeType = a.getInt(R.styleable.GestureOverlayView_gestureStrokeType, mGestureStrokeType); mGestureStrokeLengthThreshold = a.getFloat( R.styleable.GestureOverlayView_gestureStrokeLengthThreshold, mGestureStrokeLengthThreshold); mGestureStrokeAngleThreshold = a.getFloat( R.styleable.GestureOverlayView_gestureStrokeAngleThreshold, mGestureStrokeAngleThreshold); mGestureStrokeSquarenessTreshold = a.getFloat( R.styleable.GestureOverlayView_gestureStrokeSquarenessThreshold, mGestureStrokeSquarenessTreshold); mInterceptEvents = a.getBoolean(R.styleable.GestureOverlayView_eventsInterceptionEnabled, mInterceptEvents); mFadeEnabled = a.getBoolean(R.styleable.GestureOverlayView_fadeEnabled, mFadeEnabled); mOrientation = a.getInt(R.styleable.GestureOverlayView_orientation, mOrientation); a.recycle(); init(); } private void init() { setWillNotDraw(false); final Paint gesturePaint = mGesturePaint; gesturePaint.setAntiAlias(GESTURE_RENDERING_ANTIALIAS); gesturePaint.setColor(mCertainGestureColor); gesturePaint.setStyle(Paint.Style.STROKE); gesturePaint.setStrokeJoin(Paint.Join.ROUND); gesturePaint.setStrokeCap(Paint.Cap.ROUND); gesturePaint.setStrokeWidth(mGestureStrokeWidth); gesturePaint.setDither(DITHER_FLAG); mCurrentColor = mCertainGestureColor; setPaintAlpha(255); } public ArrayList<GesturePoint> getCurrentStroke() { return mStrokeBuffer; } public int getOrientation() { return mOrientation; } public void setOrientation(int orientation) { mOrientation = orientation; } public v