f2c8c89ad6
Test: ./gradlew test Bug: 72202690 Change-Id: Ia227cc38cfb54e4f33d34adfffdc6c38543060d5
119 lines
4.2 KiB
Java
119 lines
4.2 KiB
Java
/*
|
|
* Copyright (C) 2016 Google Inc.
|
|
*
|
|
* 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.setupwizardlib.gesture;
|
|
|
|
import android.graphics.Rect;
|
|
import android.view.MotionEvent;
|
|
import android.view.View;
|
|
import android.view.ViewConfiguration;
|
|
|
|
/**
|
|
* Helper class to detect the consective-tap gestures on a view.
|
|
*
|
|
* <p/>This class is instantiated and used similar to a GestureDetector, where onTouchEvent should
|
|
* be called when there are MotionEvents this detector should know about.
|
|
*/
|
|
public final class ConsecutiveTapsGestureDetector {
|
|
|
|
public interface OnConsecutiveTapsListener {
|
|
/**
|
|
* Callback method when the user tapped on the target view X number of times.
|
|
*/
|
|
void onConsecutiveTaps(int numOfConsecutiveTaps);
|
|
}
|
|
|
|
private final View mView;
|
|
private final OnConsecutiveTapsListener mListener;
|
|
private final int mConsecutiveTapTouchSlopSquare;
|
|
private final int mConsecutiveTapTimeout;
|
|
|
|
private int mConsecutiveTapsCounter = 0;
|
|
private MotionEvent mPreviousTapEvent;
|
|
|
|
/**
|
|
* @param listener The listener that responds to the gesture.
|
|
* @param view The target view that associated with consecutive-tap gesture.
|
|
*/
|
|
public ConsecutiveTapsGestureDetector(
|
|
OnConsecutiveTapsListener listener,
|
|
View view) {
|
|
mListener = listener;
|
|
mView = view;
|
|
int doubleTapSlop = ViewConfiguration.get(mView.getContext()).getScaledDoubleTapSlop();
|
|
mConsecutiveTapTouchSlopSquare = doubleTapSlop * doubleTapSlop;
|
|
mConsecutiveTapTimeout = ViewConfiguration.getDoubleTapTimeout();
|
|
}
|
|
|
|
/**
|
|
* This method should be called from the relevant activity or view, typically in
|
|
* onTouchEvent, onInterceptTouchEvent or dispatchTouchEvent.
|
|
*
|
|
* @param ev The motion event
|
|
*/
|
|
public void onTouchEvent(MotionEvent ev) {
|
|
if (ev.getAction() == MotionEvent.ACTION_UP) {
|
|
Rect viewRect = new Rect();
|
|
int[] leftTop = new int[2];
|
|
mView.getLocationOnScreen(leftTop);
|
|
viewRect.set(
|
|
leftTop[0],
|
|
leftTop[1],
|
|
leftTop[0] + mView.getWidth(),
|
|
leftTop[1] + mView.getHeight());
|
|
if (viewRect.contains((int) ev.getX(), (int) ev.getY())) {
|
|
if (isConsecutiveTap(ev)) {
|
|
mConsecutiveTapsCounter++;
|
|
} else {
|
|
mConsecutiveTapsCounter = 1;
|
|
}
|
|
mListener.onConsecutiveTaps(mConsecutiveTapsCounter);
|
|
} else {
|
|
// Touch outside the target view. Reset counter.
|
|
mConsecutiveTapsCounter = 0;
|
|
}
|
|
|
|
if (mPreviousTapEvent != null) {
|
|
mPreviousTapEvent.recycle();
|
|
}
|
|
mPreviousTapEvent = MotionEvent.obtain(ev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Resets the consecutive-tap counter to zero.
|
|
*/
|
|
public void resetCounter() {
|
|
mConsecutiveTapsCounter = 0;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the distance between consecutive tap is within
|
|
* {@link #mConsecutiveTapTouchSlopSquare}. False, otherwise.
|
|
*/
|
|
private boolean isConsecutiveTap(MotionEvent currentTapEvent) {
|
|
if (mPreviousTapEvent == null) {
|
|
return false;
|
|
}
|
|
|
|
double deltaX = mPreviousTapEvent.getX() - currentTapEvent.getX();
|
|
double deltaY = mPreviousTapEvent.getY() - currentTapEvent.getY();
|
|
long deltaTime = currentTapEvent.getEventTime() - mPreviousTapEvent.getEventTime();
|
|
return (deltaX * deltaX + deltaY * deltaY <= mConsecutiveTapTouchSlopSquare)
|
|
&& deltaTime < mConsecutiveTapTimeout;
|
|
}
|
|
}
|