cn.kylinhuang.play.view.CommonGestures.java Source code

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Here is the source code for cn.kylinhuang.play.view.CommonGestures.java

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/*
 * Copyright (C) 2012 YIXIA.COM
 *
 * 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 cn.kylinhuang.play.view;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.support.v4.view.GestureDetectorCompat;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;

public class CommonGestures {
    public static final int SCALE_STATE_BEGIN = 0;
    public static final int SCALE_STATE_SCALEING = 1;
    public static final int SCALE_STATE_END = 2;

    private boolean mGestureEnabled;

    private GestureDetectorCompat mDoubleTapGestureDetector;
    private GestureDetectorCompat mTapGestureDetector;
    private ScaleGestureDetector mScaleDetector;

    private Activity mContext;

    @SuppressLint("NewApi")
    public CommonGestures(Activity ctx) {
        mContext = ctx;
        mDoubleTapGestureDetector = new GestureDetectorCompat(mContext, new DoubleTapGestureListener());
        mTapGestureDetector = new GestureDetectorCompat(mContext, new TapGestureListener());
        mScaleDetector = new ScaleGestureDetector(mContext, new ScaleDetectorListener());
    }

    public boolean onTouchEvent(MotionEvent event) {
        if (mListener == null)
            return false;

        if (null == event)
            return false;

        if (mTapGestureDetector.onTouchEvent(event))
            return true;

        if (event.getPointerCount() > 1) {
            try {
                if (mScaleDetector != null && mScaleDetector.onTouchEvent(event))
                    return true;
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        if (mDoubleTapGestureDetector.onTouchEvent(event))
            return true;

        switch (event.getAction() & MotionEvent.ACTION_MASK) {
        case MotionEvent.ACTION_UP:
            mListener.onGestureEnd();
            break;
        }

        return true;
    }

    private class TapGestureListener extends SimpleOnGestureListener {
        @Override
        public boolean onSingleTapConfirmed(MotionEvent event) {
            if (mListener != null)
                mListener.onSingleTap();
            return true;
        }

        @Override
        public void onLongPress(MotionEvent e) {
            if (mListener != null && mGestureEnabled)
                mListener.onLongPress();
        }
    }

    @SuppressLint("NewApi")
    private class ScaleDetectorListener implements ScaleGestureDetector.OnScaleGestureListener {
        @Override
        public boolean onScale(ScaleGestureDetector detector) {
            if (mListener != null && mGestureEnabled)
                mListener.onScale(detector.getScaleFactor(), SCALE_STATE_SCALEING, detector);
            return true;
        }

        @Override
        public void onScaleEnd(ScaleGestureDetector detector) {
            if (mListener != null && mGestureEnabled)
                mListener.onScale(0F, SCALE_STATE_END, detector);
        }

        @Override
        public boolean onScaleBegin(ScaleGestureDetector detector) {
            if (mListener != null && mGestureEnabled)
                mListener.onScale(0F, SCALE_STATE_BEGIN, detector);
            return true;
        }
    }

    private class DoubleTapGestureListener extends SimpleOnGestureListener {
        private boolean mDown = false;

        @Override
        public boolean onDown(MotionEvent event) {
            mDown = true;
            return super.onDown(event);
        }

        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
            if (mListener != null && mGestureEnabled && e1 != null && e2 != null) {
                if (mDown) {
                    mListener.onGestureBegin();
                    mDown = false;
                }

                float wholeDistanceX = Math.abs(e2.getX() - e1.getX()),
                        wholeDistanceY = Math.abs(e2.getY() - e1.getY());
                if (wholeDistanceX >= wholeDistanceY) {
                    float oldX = e1.getX(), oldY = e1.getY();
                    int screenWidth = Utils.getScreenWidth(mContext);
                    int screenHeight = Utils.getScreenHeight(mContext);
                    float horizontalPercent = (oldX - e2.getX(0)) / screenWidth;
                    float verticalPpercent = (oldY - e2.getY(0)) / screenHeight;

                    mListener.onHorizontalSlide(horizontalPercent, verticalPpercent, e2.getX() - e1.getX(),
                            e2.getY() - e1.getY());
                } else {
                    float oldX = e1.getX(), oldY = e1.getY();
                    int screenWidth = Utils.getScreenWidth(mContext);
                    int screenHeight = Utils.getScreenHeight(mContext);
                    float horizontalPercent = (oldX - e2.getX(0)) / screenWidth;
                    float verticalPpercent = (oldY - e2.getY(0)) / screenHeight;

                    mListener.onVerticalSlide(horizontalPercent, verticalPpercent, e2.getX() - e1.getX(),
                            e2.getY() - e1.getY());
                }
            }
            return super.onScroll(e1, e2, distanceX, distanceY);
        }

        @Override
        public boolean onDoubleTap(MotionEvent event) {
            if (mListener != null && mGestureEnabled)
                mListener.onDoubleTap();
            return super.onDoubleTap(event);
        }
    }

    public void setTouchListener(TouchListener l, boolean enable) {
        mListener = l;
        mGestureEnabled = enable;
    }

    private TouchListener mListener;

    public interface TouchListener {
        public void onGestureBegin();

        public void onGestureEnd();

        public void onHorizontalSlide(float horizontalSlidePercent, float verticalSlidePercent, float distanceX,
                float distanceY);

        public void onVerticalSlide(float horizontalSlidePercent, float verticalSlidePercent, float distanceX,
                float distanceY);

        public void onSingleTap();

        public void onDoubleTap();

        public void onScale(float scaleFactor, int state, ScaleGestureDetector detector);

        public void onLongPress();
    }
}