FairEmail/app/src/main/java/eu/faircode/email/SwipeListener.java

72 lines
2.6 KiB
Java

package eu.faircode.email;
/*
This file is part of FairEmail.
FairEmail is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
FairEmail is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FairEmail. If not, see <http://www.gnu.org/licenses/>.
Copyright 2018-2019 by Marcel Bokhorst (M66B)
*/
import android.content.Context;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import androidx.annotation.NonNull;
public class SwipeListener implements View.OnTouchListener {
private final GestureDetector gestureDetector;
SwipeListener(final Context context, final ISwipeListener listener) {
final int width = context.getResources().getDisplayMetrics().widthPixels;
final int MOVE_THRESHOLD = width / 3;
final int SPEED_THRESHOLD = width / 2;
gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onFling(MotionEvent me1, MotionEvent me2, float vx, float vy) {
if (me1 == null || me2 == null)
return false;
boolean consumed = false;
int dx = Math.round(me2.getX() - me1.getX());
int dy = Math.round(me2.getY() - me1.getY());
if (Math.abs(dx) > Math.abs(dy)) {
Log.i("Swipe dx=" + dx + "/" + MOVE_THRESHOLD + " vx=" + vx + "/" + SPEED_THRESHOLD);
if (Math.abs(dx) > MOVE_THRESHOLD && Math.abs(vx) > SPEED_THRESHOLD)
try {
if (dx > 0)
consumed = listener.onSwipeRight();
else
consumed = listener.onSwipeLeft();
} catch (Throwable ex) {
Log.e(ex);
}
}
return consumed;
}
});
}
public boolean onTouch(@NonNull View view, @NonNull MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
interface ISwipeListener {
boolean onSwipeRight();
boolean onSwipeLeft();
}
}