Commit 6b14a9a8 authored by Danny Lin's avatar Danny Lin Committed by Michael Bestas
Browse files

ExactCalculator: Add haptic image button widget

This is a basic extension of ImageButton that provides haptic feedback when
the user touches the button (*not* when they release, to reduce latency).
It uses the system's predefined virtual key haptic feedback effect for
modern vibration effects that the user is already familiar with and
automatic response to changes in system vibration settings.

Change-Id: Ib390860809438b9289364c8a2ece2528853bb338
parent 9c4b1556
/*
* Copyright (C) 2007 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.calculator2;
import android.widget.ImageButton;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.MotionEvent;
import android.view.HapticFeedbackConstants;
/**
* A basic ImageButton that vibrates on finger down.
*/
public class HapticImageButton extends ImageButton {
public HapticImageButton(Context context) {
super(context);
initVibration(context);
}
public HapticImageButton(Context context, AttributeSet attrs) {
super(context, attrs);
initVibration(context);
}
public HapticImageButton(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initVibration(context);
}
public HapticImageButton(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
initVibration(context);
}
private void initVibration(Context context) {
setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
}
// Passthrough
return false;
}
});
}
}
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