src/com/android/camera/PreviewGestures.java - platform/packages/apps/Gallery2 - Git at Google

 /*
  * Copyright (C) 2012 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 com.android.camera;

 import android.os.Handler;
 import android.os.Message;
 import android.view.MotionEvent;
 import android.view.ScaleGestureDetector;
 import android.view.View;
 import android.view.ViewConfiguration;

 import com.android.camera.ui.PieRenderer;
 import com.android.camera.ui.RenderOverlay;
 import com.android.camera.ui.ZoomRenderer;
 import com.android.gallery3d.R;

 import java.util.ArrayList;
 import java.util.List;

 public class PreviewGestures
         implements ScaleGestureDetector.OnScaleGestureListener {

     private static final String TAG = "CAM_gestures";

     private static final long TIMEOUT_PIE = 200;
     private static final int MSG_PIE = 1;
     private static final int MODE_NONE = 0;
     private static final int MODE_PIE = 1;
     private static final int MODE_ZOOM = 2;
     private static final int MODE_MODULE = 3;
     private static final int MODE_ALL = 4;
     private static final int MODE_SWIPE = 5;

     public static final int DIR_UP = 0;
     public static final int DIR_DOWN = 1;
     public static final int DIR_LEFT = 2;
     public static final int DIR_RIGHT = 3;

     private CameraActivity mActivity;
     private SingleTapListener mTapListener;
     private RenderOverlay mOverlay;
     private PieRenderer mPie;
     private ZoomRenderer mZoom;
     private MotionEvent mDown;
     private MotionEvent mCurrent;
     private ScaleGestureDetector mScale;
     private List<View> mReceivers;
     private List<View> mUnclickableAreas;
     private int mMode;
     private int mSlop;
     private int mTapTimeout;
     private boolean mEnabled;
     private boolean mZoomOnly;
     private int mOrientation;
     private int[] mLocation;
     private SwipeListener mSwipeListener;

     private Handler mHandler = new Handler() {
         public void handleMessage(Message msg) {
             if (msg.what == MSG_PIE) {
                 mMode = MODE_PIE;
                 openPie();
                 cancelActivityTouchHandling(mDown);
             }
         }
     };

     public interface SingleTapListener {
         public void onSingleTapUp(View v, int x, int y);
     }

     interface SwipeListener {
         public void onSwipe(int direction);
     }

     public PreviewGestures(CameraActivity ctx, SingleTapListener tapListener,
             ZoomRenderer zoom, PieRenderer pie, SwipeListener swipe) {
         mActivity = ctx;
         mTapListener = tapListener;
         mPie = pie;
         mZoom = zoom;
         mMode = MODE_ALL;
         mScale = new ScaleGestureDetector(ctx, this);
         mSlop = (int) ctx.getResources().getDimension(R.dimen.pie_touch_slop);
         mTapTimeout = ViewConfiguration.getTapTimeout();
         mEnabled = true;
         mLocation = new int[2];
         mSwipeListener = swipe;
     }

     public void setRenderOverlay(RenderOverlay overlay) {
         mOverlay = overlay;
     }

     public void setOrientation(int orientation) {
         mOrientation = orientation;
     }

     public void setEnabled(boolean enabled) {
         mEnabled = enabled;
         if (!enabled) {
             cancelPie();
         }
     }

     public void setZoomOnly(boolean zoom) {
         mZoomOnly = zoom;
     }

     public void addTouchReceiver(View v) {
         if (mReceivers == null) {
             mReceivers = new ArrayList<View>();
         }
         mReceivers.add(v);
     }

     public void removeTouchReceiver(View v) {
         if (mReceivers == null || v == null) return;
         mReceivers.remove(v);
     }

     public void addUnclickableArea(View v) {
         if (mUnclickableAreas == null) {
             mUnclickableAreas = new ArrayList<View>();
         }
         mUnclickableAreas.add(v);
     }

     public void clearTouchReceivers() {
         if (mReceivers != null) {
             mReceivers.clear();
         }
     }

     public void clearUnclickableAreas() {
         if (mUnclickableAreas != null) {
             mUnclickableAreas.clear();
         }
     }

     private boolean checkClickable(MotionEvent m) {
         if (mUnclickableAreas != null) {
             for (View v : mUnclickableAreas) {
                 if (isInside(m, v)) {
                     return false;
                 }
             }
         }
         return true;
     }

     public void reset() {
         clearTouchReceivers();
         clearUnclickableAreas();
     }

     public boolean dispatchTouch(MotionEvent m) {
         if (!mEnabled) {
             return mActivity.superDispatchTouchEvent(m);
         }
         mCurrent = m;
         if (MotionEvent.ACTION_DOWN == m.getActionMasked()) {
             if (checkReceivers(m)) {
                 mMode = MODE_MODULE;
                 return mActivity.superDispatchTouchEvent(m);
             } else {
                 mMode = MODE_ALL;
                 mDown = MotionEvent.obtain(m);
                 if (mPie != null && mPie.showsItems()) {
                     mMode = MODE_PIE;
                     return sendToPie(m);
                 }
                 if (mPie != null && !mZoomOnly && checkClickable(m)) {
                     mHandler.sendEmptyMessageDelayed(MSG_PIE, TIMEOUT_PIE);
                 }
                 if (mZoom != null) {
                     mScale.onTouchEvent(m);
                 }
                 // make sure this is ok
                 return mActivity.superDispatchTouchEvent(m);
             }
         } else if (mMode == MODE_NONE) {
             return false;
         } else if (mMode == MODE_SWIPE) {
             if (MotionEvent.ACTION_UP == m.getActionMasked()) {
                 mSwipeListener.onSwipe(getSwipeDirection(m));
             }
             return true;
         } else if (mMode == MODE_PIE) {
             if (MotionEvent.ACTION_POINTER_DOWN == m.getActionMasked()) {
                 sendToPie(makeCancelEvent(m));
                 if (mZoom != null) {
                     onScaleBegin(mScale);
                 }
             } else {
                 return sendToPie(m);
             }
             return true;
         } else if (mMode == MODE_ZOOM) {
             mScale.onTouchEvent(m);
             if (!mScale.isInProgress() && MotionEvent.ACTION_POINTER_UP == m.getActionMasked()) {
                 mMode = MODE_NONE;
                 onScaleEnd(mScale);
             }
             return true;
         } else if (mMode == MODE_MODULE) {
             return mActivity.superDispatchTouchEvent(m);
         } else {
             // didn't receive down event previously;
             // assume module wasn't initialzed and ignore this event.
             if (mDown == null) {
                 return true;
             }
             if (MotionEvent.ACTION_POINTER_DOWN == m.getActionMasked()) {
                 if (!mZoomOnly) {
                     cancelPie();
                     sendToPie(makeCancelEvent(m));
                 }
                 if (mZoom != null) {
                     mScale.onTouchEvent(m);
                     onScaleBegin(mScale);
                 }
             } else if ((mMode == MODE_ZOOM) && !mScale.isInProgress()
                     && MotionEvent.ACTION_POINTER_UP == m.getActionMasked()) {
                 // user initiated and stopped zoom gesture without zooming
                 mScale.onTouchEvent(m);
                 onScaleEnd(mScale);
             }
             // not zoom or pie mode and no timeout yet
             if (mZoom != null) {
                 boolean res = mScale.onTouchEvent(m);
                 if (mScale.isInProgress()) {
                     cancelPie();
                     cancelActivityTouchHandling(m);
                     return res;
                 }
             }
             if (MotionEvent.ACTION_UP == m.getActionMasked()) {
                 cancelPie();
                 // must have been tap
                 if (m.getEventTime() - mDown.getEventTime() < mTapTimeout
                         && checkClickable(m)) {
                     cancelActivityTouchHandling(m);
                     mTapListener.onSingleTapUp(null,
                             (int) mDown.getX() - mOverlay.getWindowPositionX(),
                             (int) mDown.getY() - mOverlay.getWindowPositionY());
                     return true;
                 } else {
                     return mActivity.superDispatchTouchEvent(m);
                 }
             } else if (MotionEvent.ACTION_MOVE == m.getActionMasked()) {
                 if ((Math.abs(m.getX() - mDown.getX()) > mSlop)
                         || Math.abs(m.getY() - mDown.getY()) > mSlop) {
                     // moved too far and no timeout yet, no focus or pie
                     cancelPie();
                     int dir = getSwipeDirection(m);
                     if (dir == DIR_LEFT) {
                         mMode = MODE_MODULE;
                         return mActivity.superDispatchTouchEvent(m);
                     } else {
                         cancelActivityTouchHandling(m);
                         mMode = MODE_NONE;
                     }
                 }
             }
             return false;
         }
     }

     private boolean checkReceivers(MotionEvent m) {
         if (mReceivers != null) {
             for (View receiver : mReceivers) {
                 if (isInside(m, receiver)) {
                     return true;
                 }
             }
         }
         return false;
     }

     // left tests for finger moving right to left
     private int getSwipeDirection(MotionEvent m) {
         float dx = 0;
         float dy = 0;
         switch (mOrientation) {
         case 0:
             dx = m.getX() - mDown.getX();
             dy = m.getY() - mDown.getY();
             break;
         case 90:
             dx = - (m.getY() - mDown.getY());
             dy = m.getX() - mDown.getX();
             break;
         case 180:
             dx = -(m.getX() - mDown.getX());
             dy = m.getY() - mDown.getY();
             break;
         case 270:
             dx = m.getY() - mDown.getY();
             dy = m.getX() - mDown.getX();
             break;
         }
         if (dx < 0 && (Math.abs(dy) / -dx < 2)) return DIR_LEFT;
         if (dx > 0 && (Math.abs(dy) / dx < 2)) return DIR_RIGHT;
         if (dy > 0) return DIR_DOWN;
         return DIR_UP;
     }

     private boolean isInside(MotionEvent evt, View v) {
         v.getLocationInWindow(mLocation);
         // when view is flipped horizontally
         if ((int) v.getRotationY() == 180) {
             mLocation[0] -= v.getWidth();
         }
         // when view is flipped vertically
         if ((int) v.getRotationX() == 180) {
             mLocation[1] -= v.getHeight();
         }
         return (v.getVisibility() == View.VISIBLE
                 && evt.getX() >= mLocation[0] && evt.getX() < mLocation[0] + v.getWidth()
                 && evt.getY() >= mLocation[1] && evt.getY() < mLocation[1] + v.getHeight());
     }

     public void cancelActivityTouchHandling(MotionEvent m) {
         mActivity.superDispatchTouchEvent(makeCancelEvent(m));
     }

     private MotionEvent makeCancelEvent(MotionEvent m) {
         MotionEvent c = MotionEvent.obtain(m);
         c.setAction(MotionEvent.ACTION_CANCEL);
         return c;
     }

     private void openPie() {
         mDown.offsetLocation(-mOverlay.getWindowPositionX(),
                 -mOverlay.getWindowPositionY());
         mOverlay.directDispatchTouch(mDown, mPie);
     }

     private void cancelPie() {
         mHandler.removeMessages(MSG_PIE);
     }

     private boolean sendToPie(MotionEvent m) {
         m.offsetLocation(-mOverlay.getWindowPositionX(),
                 -mOverlay.getWindowPositionY());
         return mOverlay.directDispatchTouch(m, mPie);
     }

     @Override
     public boolean onScale(ScaleGestureDetector detector) {
         return mZoom.onScale(detector);
     }

     @Override
     public boolean onScaleBegin(ScaleGestureDetector detector) {
         if (mMode != MODE_ZOOM) {
             mMode = MODE_ZOOM;
             cancelActivityTouchHandling(mCurrent);
         }
         if (mCurrent.getActionMasked() != MotionEvent.ACTION_MOVE) {
             return mZoom.onScaleBegin(detector);
         } else {
             return true;
         }
     }

     @Override
     public void onScaleEnd(ScaleGestureDetector detector) {
         if (mCurrent.getActionMasked() != MotionEvent.ACTION_MOVE) {
             mZoom.onScaleEnd(detector);
         }
     }
 }
	/*
	* Copyright (C) 2012 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 com.android.camera;

	import android.os.Handler;
	import android.os.Message;
	import android.view.MotionEvent;
	import android.view.ScaleGestureDetector;
	import android.view.View;
	import android.view.ViewConfiguration;

	import com.android.camera.ui.PieRenderer;
	import com.android.camera.ui.RenderOverlay;
	import com.android.camera.ui.ZoomRenderer;
	import com.android.gallery3d.R;

	import java.util.ArrayList;
	import java.util.List;

	public class PreviewGestures
	implements ScaleGestureDetector.OnScaleGestureListener {

	private static final String TAG = "CAM_gestures";

	private static final long TIMEOUT_PIE = 200;
	private static final int MSG_PIE = 1;
	private static final int MODE_NONE = 0;
	private static final int MODE_PIE = 1;
	private static final int MODE_ZOOM = 2;
	private static final int MODE_MODULE = 3;
	private static final int MODE_ALL = 4;
	private static final int MODE_SWIPE = 5;

	public static final int DIR_UP = 0;
	public static final int DIR_DOWN = 1;
	public static final int DIR_LEFT = 2;
	public static final int DIR_RIGHT = 3;

	private CameraActivity mActivity;
	private SingleTapListener mTapListener;
	private RenderOverlay mOverlay;
	private PieRenderer mPie;
	private ZoomRenderer mZoom;
	private MotionEvent mDown;
	private MotionEvent mCurrent;
	private ScaleGestureDetector mScale;
	private List<View> mReceivers;
	private List<View> mUnclickableAreas;
	private int mMode;
	private int mSlop;
	private int mTapTimeout;
	private boolean mEnabled;
	private boolean mZoomOnly;
	private int mOrientation;
	private int[] mLocation;
	private SwipeListener mSwipeListener;

	private Handler mHandler = new Handler() {
	public void handleMessage(Message msg) {
	if (msg.what == MSG_PIE) {
	mMode = MODE_PIE;
	openPie();
	cancelActivityTouchHandling(mDown);
	}
	}
	};

	public interface SingleTapListener {
	public void onSingleTapUp(View v, int x, int y);
	}

	interface SwipeListener {
	public void onSwipe(int direction);
	}

	public PreviewGestures(CameraActivity ctx, SingleTapListener tapListener,
	ZoomRenderer zoom, PieRenderer pie, SwipeListener swipe) {
	mActivity = ctx;
	mTapListener = tapListener;
	mPie = pie;
	mZoom = zoom;
	mMode = MODE_ALL;
	mScale = new ScaleGestureDetector(ctx, this);
	mSlop = (int) ctx.getResources().getDimension(R.dimen.pie_touch_slop);
	mTapTimeout = ViewConfiguration.getTapTimeout();
	mEnabled = true;
	mLocation = new int[2];
	mSwipeListener = swipe;
	}

	public void setRenderOverlay(RenderOverlay overlay) {
	mOverlay = overlay;
	}

	public void setOrientation(int orientation) {
	mOrientation = orientation;
	}

	public void setEnabled(boolean enabled) {
	mEnabled = enabled;
	if (!enabled) {
	cancelPie();
	}
	}

	public void setZoomOnly(boolean zoom) {
	mZoomOnly = zoom;
	}

	public void addTouchReceiver(View v) {
	if (mReceivers == null) {
	mReceivers = new ArrayList<View>();
	}
	mReceivers.add(v);
	}

	public void removeTouchReceiver(View v) {
	if (mReceivers == null \|\| v == null) return;
	mReceivers.remove(v);
	}

	public void addUnclickableArea(View v) {
	if (mUnclickableAreas == null) {
	mUnclickableAreas = new ArrayList<View>();
	}
	mUnclickableAreas.add(v);
	}

	public void clearTouchReceivers() {
	if (mReceivers != null) {
	mReceivers.clear();
	}
	}

	public void clearUnclickableAreas() {
	if (mUnclickableAreas != null) {
	mUnclickableAreas.clear();
	}
	}

	private boolean checkClickable(MotionEvent m) {
	if (mUnclickableAreas != null) {
	for (View v : mUnclickableAreas) {
	if (isInside(m, v)) {
	return false;
	}
	}
	}
	return true;
	}

	public void reset() {
	clearTouchReceivers();
	clearUnclickableAreas();
	}

	public boolean dispatchTouch(MotionEvent m) {
	if (!mEnabled) {
	return mActivity.superDispatchTouchEvent(m);
	}
	mCurrent = m;
	if (MotionEvent.ACTION_DOWN == m.getActionMasked()) {
	if (checkReceivers(m)) {
	mMode = MODE_MODULE;
	return mActivity.superDispatchTouchEvent(m);
	} else {
	mMode = MODE_ALL;
	mDown = MotionEvent.obtain(m);
	if (mPie != null && mPie.showsItems()) {
	mMode = MODE_PIE;
	return sendToPie(m);
	}
	if (mPie != null && !mZoomOnly && checkClickable(m)) {
	mHandler.sendEmptyMessageDelayed(MSG_PIE, TIMEOUT_PIE);
	}
	if (mZoom != null) {
	mScale.onTouchEvent(m);
	}
	// make sure this is ok
	return mActivity.superDispatchTouchEvent(m);
	}
	} else if (mMode == MODE_NONE) {
	return false;
	} else if (mMode == MODE_SWIPE) {
	if (MotionEvent.ACTION_UP == m.getActionMasked()) {
	mSwipeListener.onSwipe(getSwipeDirection(m));
	}
	return true;
	} else if (mMode == MODE_PIE) {
	if (MotionEvent.ACTION_POINTER_DOWN == m.getActionMasked()) {
	sendToPie(makeCancelEvent(m));
	if (mZoom != null) {
	onScaleBegin(mScale);
	}
	} else {
	return sendToPie(m);
	}
	return true;
	} else if (mMode == MODE_ZOOM) {
	mScale.onTouchEvent(m);
	if (!mScale.isInProgress() && MotionEvent.ACTION_POINTER_UP == m.getActionMasked()) {
	mMode = MODE_NONE;
	onScaleEnd(mScale);
	}
	return true;
	} else if (mMode == MODE_MODULE) {
	return mActivity.superDispatchTouchEvent(m);
	} else {
	// didn't receive down event previously;
	// assume module wasn't initialzed and ignore this event.
	if (mDown == null) {
	return true;
	}
	if (MotionEvent.ACTION_POINTER_DOWN == m.getActionMasked()) {
	if (!mZoomOnly) {
	cancelPie();
	sendToPie(makeCancelEvent(m));
	}
	if (mZoom != null) {
	mScale.onTouchEvent(m);
	onScaleBegin(mScale);
	}
	} else if ((mMode == MODE_ZOOM) && !mScale.isInProgress()
	&& MotionEvent.ACTION_POINTER_UP == m.getActionMasked()) {
	// user initiated and stopped zoom gesture without zooming
	mScale.onTouchEvent(m);
	onScaleEnd(mScale);
	}
	// not zoom or pie mode and no timeout yet
	if (mZoom != null) {
	boolean res = mScale.onTouchEvent(m);
	if (mScale.isInProgress()) {
	cancelPie();
	cancelActivityTouchHandling(m);
	return res;
	}
	}
	if (MotionEvent.ACTION_UP == m.getActionMasked()) {
	cancelPie();
	// must have been tap
	if (m.getEventTime() - mDown.getEventTime() < mTapTimeout
	&& checkClickable(m)) {
	cancelActivityTouchHandling(m);
	mTapListener.onSingleTapUp(null,
	(int) mDown.getX() - mOverlay.getWindowPositionX(),
	(int) mDown.getY() - mOverlay.getWindowPositionY());
	return true;
	} else {
	return mActivity.superDispatchTouchEvent(m);
	}
	} else if (MotionEvent.ACTION_MOVE == m.getActionMasked()) {
	if ((Math.abs(m.getX() - mDown.getX()) > mSlop)
	\|\| Math.abs(m.getY() - mDown.getY()) > mSlop) {
	// moved too far and no timeout yet, no focus or pie
	cancelPie();
	int dir = getSwipeDirection(m);
	if (dir == DIR_LEFT) {
	mMode = MODE_MODULE;
	return mActivity.superDispatchTouchEvent(m);
	} else {
	cancelActivityTouchHandling(m);
	mMode = MODE_NONE;
	}
	}
	}
	return false;
	}
	}

	private boolean checkReceivers(MotionEvent m) {
	if (mReceivers != null) {
	for (View receiver : mReceivers) {
	if (isInside(m, receiver)) {
	return true;
	}
	}
	}
	return false;
	}

	// left tests for finger moving right to left
	private int getSwipeDirection(MotionEvent m) {
	float dx = 0;
	float dy = 0;
	switch (mOrientation) {
	case 0:
	dx = m.getX() - mDown.getX();
	dy = m.getY() - mDown.getY();
	break;
	case 90:
	dx = - (m.getY() - mDown.getY());
	dy = m.getX() - mDown.getX();
	break;
	case 180:
	dx = -(m.getX() - mDown.getX());
	dy = m.getY() - mDown.getY();
	break;
	case 270:
	dx = m.getY() - mDown.getY();
	dy = m.getX() - mDown.getX();
	break;
	}
	if (dx < 0 && (Math.abs(dy) / -dx < 2)) return DIR_LEFT;
	if (dx > 0 && (Math.abs(dy) / dx < 2)) return DIR_RIGHT;
	if (dy > 0) return DIR_DOWN;
	return DIR_UP;
	}

	private boolean isInside(MotionEvent evt, View v) {
	v.getLocationInWindow(mLocation);
	// when view is flipped horizontally
	if ((int) v.getRotationY() == 180) {
	mLocation[0] -= v.getWidth();
	}
	// when view is flipped vertically
	if ((int) v.getRotationX() == 180) {
	mLocation[1] -= v.getHeight();
	}
	return (v.getVisibility() == View.VISIBLE
	&& evt.getX() >= mLocation[0] && evt.getX() < mLocation[0] + v.getWidth()
	&& evt.getY() >= mLocation[1] && evt.getY() < mLocation[1] + v.getHeight());
	}

	public void cancelActivityTouchHandling(MotionEvent m) {
	mActivity.superDispatchTouchEvent(makeCancelEvent(m));
	}

	private MotionEvent makeCancelEvent(MotionEvent m) {
	MotionEvent c = MotionEvent.obtain(m);
	c.setAction(MotionEvent.ACTION_CANCEL);
	return c;
	}

	private void openPie() {
	mDown.offsetLocation(-mOverlay.getWindowPositionX(),
	-mOverlay.getWindowPositionY());
	mOverlay.directDispatchTouch(mDown, mPie);
	}

	private void cancelPie() {
	mHandler.removeMessages(MSG_PIE);
	}

	private boolean sendToPie(MotionEvent m) {
	m.offsetLocation(-mOverlay.getWindowPositionX(),
	-mOverlay.getWindowPositionY());
	return mOverlay.directDispatchTouch(m, mPie);
	}

	@Override
	public boolean onScale(ScaleGestureDetector detector) {
	return mZoom.onScale(detector);
	}

	@Override
	public boolean onScaleBegin(ScaleGestureDetector detector) {
	if (mMode != MODE_ZOOM) {
	mMode = MODE_ZOOM;
	cancelActivityTouchHandling(mCurrent);
	}
	if (mCurrent.getActionMasked() != MotionEvent.ACTION_MOVE) {
	return mZoom.onScaleBegin(detector);
	} else {
	return true;
	}
	}

	@Override
	public void onScaleEnd(ScaleGestureDetector detector) {
	if (mCurrent.getActionMasked() != MotionEvent.ACTION_MOVE) {
	mZoom.onScaleEnd(detector);
	}
	}
	}