mirror of https://github.com/M66B/FairEmail.git
79 lines
3.0 KiB
Java
79 lines
3.0 KiB
Java
package eu.faircode.email;
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/*
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This file is part of FairEmail.
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FairEmail is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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FairEmail is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FairEmail. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2018-2022 by Marcel Bokhorst (M66B)
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*/
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import android.content.Context;
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import android.view.GestureDetector;
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import android.view.MotionEvent;
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import android.view.View;
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import androidx.annotation.NonNull;
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public class SwipeListener implements View.OnTouchListener {
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private final GestureDetector gestureDetector;
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SwipeListener(final Context context, final ISwipeListener listener) {
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final int width = Math.min(
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context.getResources().getDisplayMetrics().widthPixels,
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context.getResources().getDisplayMetrics().heightPixels);
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final int MOVE_THRESHOLD = width / 3;
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final int SPEED_THRESHOLD = width / 2;
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gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
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@Override
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public boolean onScroll(MotionEvent me1, MotionEvent me2, float distanceX, float distanceY) {
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if (me1 == null || me2 == null)
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return false;
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if (me1.getPointerCount() > 1 || me2.getPointerCount() > 1)
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return false;
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boolean consumed = false;
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int dx = Math.round(me2.getX() - me1.getX());
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int dy = Math.round(me2.getY() - me1.getY());
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long dt = me2.getEventTime() - me1.getEventTime();
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long vx = (dt == 0 ? 0 : dx * 1000 / dt);
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if (Math.abs(dx) > Math.abs(dy)) {
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Log.i("Swipe dx=" + dx + "/" + MOVE_THRESHOLD +
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" dt=" + dt + " vx=" + vx + "/" + SPEED_THRESHOLD);
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if (Math.abs(dx) > MOVE_THRESHOLD && Math.abs(vx) > SPEED_THRESHOLD)
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try {
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if (dx > 0)
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consumed = listener.onSwipeRight();
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else
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consumed = listener.onSwipeLeft();
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} catch (Throwable ex) {
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Log.e(ex);
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}
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}
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return consumed;
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}
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});
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}
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public boolean onTouch(@NonNull View view, @NonNull MotionEvent event) {
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return gestureDetector.onTouchEvent(event);
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}
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interface ISwipeListener {
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boolean onSwipeRight();
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boolean onSwipeLeft();
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}
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} |