diff options
Diffstat (limited to 'platform/android/MapboxGLAndroidSDK/src/main/java/com/almeros/android/multitouch/gesturedetectors/RotateGestureDetector.java')
| -rw-r--r-- | platform/android/MapboxGLAndroidSDK/src/main/java/com/almeros/android/multitouch/gesturedetectors/RotateGestureDetector.java | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/almeros/android/multitouch/gesturedetectors/RotateGestureDetector.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/almeros/android/multitouch/gesturedetectors/RotateGestureDetector.java new file mode 100644 index 0000000000..124fe8509c --- /dev/null +++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/almeros/android/multitouch/gesturedetectors/RotateGestureDetector.java @@ -0,0 +1,180 @@ +package com.almeros.android.multitouch.gesturedetectors; + +import android.content.Context; +import android.view.MotionEvent; + +/** + * @author Almer Thie (code.almeros.com) Copyright (c) 2013, Almer Thie + * (code.almeros.com) + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY + * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ +public class RotateGestureDetector extends TwoFingerGestureDetector { + + /** + * Listener which must be implemented which is used by RotateGestureDetector + * to perform callbacks to any implementing class which is registered to a + * RotateGestureDetector via the constructor. + * + * @see RotateGestureDetector.SimpleOnRotateGestureListener + */ + public interface OnRotateGestureListener { + public boolean onRotate(RotateGestureDetector detector); + + public boolean onRotateBegin(RotateGestureDetector detector); + + public void onRotateEnd(RotateGestureDetector detector); + } + + /** + * Helper class which may be extended and where the methods may be + * implemented. This way it is not necessary to implement all methods of + * OnRotateGestureListener. + */ + public static class SimpleOnRotateGestureListener implements + OnRotateGestureListener { + public boolean onRotate(RotateGestureDetector detector) { + return false; + } + + public boolean onRotateBegin(RotateGestureDetector detector) { + return true; + } + + public void onRotateEnd(RotateGestureDetector detector) { + // Do nothing, overridden implementation may be used + } + } + + private final OnRotateGestureListener mListener; + private boolean mSloppyGesture; + + public RotateGestureDetector(Context context, + OnRotateGestureListener listener) { + super(context); + mListener = listener; + } + + @Override + protected void handleStartProgressEvent(int actionCode, MotionEvent event) { + switch (actionCode) { + case MotionEvent.ACTION_POINTER_DOWN: + // At least the second finger is on screen now + + resetState(); // In case we missed an UP/CANCEL event + mPrevEvent = MotionEvent.obtain(event); + mTimeDelta = 0; + + updateStateByEvent(event); + + // See if we have a sloppy gesture + mSloppyGesture = isSloppyGesture(event); + if (!mSloppyGesture) { + // No, start gesture now + mGestureInProgress = mListener.onRotateBegin(this); + } + break; + + case MotionEvent.ACTION_MOVE: + if (!mSloppyGesture) { + break; + } + + // See if we still have a sloppy gesture + mSloppyGesture = isSloppyGesture(event); + if (!mSloppyGesture) { + // No, start normal gesture now + mGestureInProgress = mListener.onRotateBegin(this); + } + + break; + + case MotionEvent.ACTION_POINTER_UP: + if (!mSloppyGesture) { + break; + } + + break; + } + } + + @Override + protected void handleInProgressEvent(int actionCode, MotionEvent event) { + switch (actionCode) { + case MotionEvent.ACTION_POINTER_UP: + // Gesture ended but + updateStateByEvent(event); + + if (!mSloppyGesture) { + mListener.onRotateEnd(this); + } + + resetState(); + break; + + case MotionEvent.ACTION_CANCEL: + if (!mSloppyGesture) { + mListener.onRotateEnd(this); + } + + resetState(); + break; + + case MotionEvent.ACTION_MOVE: + updateStateByEvent(event); + + // Only accept the event if our relative pressure is within + // a certain limit. This can help filter shaky data as a + // finger is lifted. + if (mCurrPressure / mPrevPressure > PRESSURE_THRESHOLD) { + final boolean updatePrevious = mListener.onRotate(this); + if (updatePrevious) { + mPrevEvent.recycle(); + mPrevEvent = MotionEvent.obtain(event); + } + } + break; + } + } + + @Override + protected void resetState() { + super.resetState(); + mSloppyGesture = false; + } + + /** + * Return the rotation difference from the previous rotate event to the + * current event. + * + * @return The current rotation //difference in degrees. + */ + public float getRotationDegreesDelta() { + double diffRadians = Math.atan2(mPrevFingerDiffY, mPrevFingerDiffX) + - Math.atan2(mCurrFingerDiffY, mCurrFingerDiffX); + return (float) (diffRadians * 180.0 / Math.PI); + } +} |