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/*
* Copyright (C) 2013 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.view.GestureDetector;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import com.android.camera.ui.PieRenderer;
import com.android.camera.ui.RenderOverlay;
import com.android.camera.ui.ZoomRenderer;
/* PreviewGestures disambiguates touch events received on RenderOverlay
* and dispatch them to the proper recipient (i.e. zoom renderer or pie renderer).
* Touch events on CameraControls will be handled by framework.
* */
public class PreviewGestures
implements ScaleGestureDetector.OnScaleGestureListener {
private static final String TAG = "CAM_gestures";
private static final int MODE_NONE = 0;
private static final int MODE_ZOOM = 2;
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 SingleTapListener mTapListener;
private RenderOverlay mOverlay;
private PieRenderer mPie;
private ZoomRenderer mZoom;
private MotionEvent mDown;
private MotionEvent mCurrent;
private ScaleGestureDetector mScale;
private int mMode;
private boolean mZoomEnabled;
private boolean mEnabled;
private boolean mZoomOnly;
private GestureDetector mGestureDetector;
private GestureDetector.SimpleOnGestureListener mGestureListener = new GestureDetector.SimpleOnGestureListener() {
@Override
public void onLongPress (MotionEvent e) {
// Open pie
if (!mZoomOnly && mPie != null && !mPie.showsItems()) {
openPie();
}
}
@Override
public boolean onSingleTapUp (MotionEvent e) {
// Tap to focus when pie is not open
if (mPie == null || !mPie.showsItems()) {
mTapListener.onSingleTapUp(null, (int) e.getX(), (int) e.getY());
return true;
}
return false;
}
@Override
public boolean onScroll (MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
if (mZoomOnly || mMode == MODE_ZOOM) return false;
int deltaX = (int) (e1.getX() - e2.getX());
int deltaY = (int) (e1.getY() - e2.getY());
if (deltaY > 2 * deltaX && deltaY > -2 * deltaX) {
// Open pie on swipe up
if (mPie != null && !mPie.showsItems()) {
openPie();
return true;
}
}
return false;
}
};
public interface SingleTapListener {
public void onSingleTapUp(View v, int x, int y);
}
public PreviewGestures(CameraActivity ctx, SingleTapListener tapListener,
ZoomRenderer zoom, PieRenderer pie) {
mTapListener = tapListener;
mPie = pie;
mZoom = zoom;
mMode = MODE_NONE;
mScale = new ScaleGestureDetector(ctx, this);
mEnabled = true;
mGestureDetector = new GestureDetector(mGestureListener);
}
public void setRenderOverlay(RenderOverlay overlay) {
mOverlay = overlay;
}
public void setEnabled(boolean enabled) {
mEnabled = enabled;
}
public void setZoomEnabled(boolean enable) {
mZoomEnabled = enable;
}
public void setZoomOnly(boolean zoom) {
mZoomOnly = zoom;
}
public boolean isEnabled() {
return mEnabled;
}
public boolean dispatchTouch(MotionEvent m) {
if (!mEnabled) {
return false;
}
mCurrent = m;
if (MotionEvent.ACTION_DOWN == m.getActionMasked()) {
mMode = MODE_NONE;
mDown = MotionEvent.obtain(m);
}
// If pie is open, redirects all the touch events to pie.
if (mPie != null && mPie.isOpen()) {
return sendToPie(m);
}
// If pie is not open, send touch events to gesture detector and scale
// listener to recognize the gesture.
mGestureDetector.onTouchEvent(m);
if (mZoom != null) {
mScale.onTouchEvent(m);
if (MotionEvent.ACTION_POINTER_DOWN == m.getActionMasked()) {
mMode = MODE_ZOOM;
if (mZoomEnabled) {
// Start showing zoom UI as soon as there is a second finger down
mZoom.onScaleBegin(mScale);
}
} else if (MotionEvent.ACTION_POINTER_UP == m.getActionMasked()) {
mZoom.onScaleEnd(mScale);
}
}
return true;
}
private MotionEvent makeCancelEvent(MotionEvent m) {
MotionEvent c = MotionEvent.obtain(m);
c.setAction(MotionEvent.ACTION_CANCEL);
return c;
}
private void openPie() {
mGestureDetector.onTouchEvent(makeCancelEvent(mDown));
mScale.onTouchEvent(makeCancelEvent(mDown));
mOverlay.directDispatchTouch(mDown, mPie);
}
private boolean sendToPie(MotionEvent m) {
return mOverlay.directDispatchTouch(m, mPie);
}
// OnScaleGestureListener implementation
@Override
public boolean onScale(ScaleGestureDetector detector) {
return mZoom.onScale(detector);
}
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
if (mPie == null || !mPie.isOpen()) {
mMode = MODE_ZOOM;
mGestureDetector.onTouchEvent(makeCancelEvent(mCurrent));
if (!mZoomEnabled) return false;
return mZoom.onScaleBegin(detector);
}
return false;
}
@Override
public void onScaleEnd(ScaleGestureDetector detector) {
mZoom.onScaleEnd(detector);
}
}
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