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/**
* Copyright (C) 2014 Google Inc.
* Licensed to 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.mail.ui;
import android.content.Context;
import android.os.SystemClock;
import android.support.annotation.NonNull;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import android.widget.FrameLayout;
/**
* Empty frame to steal events for two-pane view when the drawer is open.
*/
public class ConversationViewFrame extends FrameLayout {
private final ViewConfiguration mConfiguration;
private long mInterceptedTime;
private float mInterceptedXDown;
private float mInterceptedYDown;
public interface DownEventListener {
boolean shouldBlockTouchEvents();
void onConversationViewFrameTapped();
void onConversationViewTouchDown();
}
private DownEventListener mDownEventListener;
public ConversationViewFrame(Context c) {
this(c, null);
}
public ConversationViewFrame(Context c, AttributeSet attrs) {
super(c, attrs);
mConfiguration = ViewConfiguration.get(c);
}
public void setDownEventListener(DownEventListener l) {
mDownEventListener = l;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
final boolean steal = (mDownEventListener != null
&& mDownEventListener.shouldBlockTouchEvents());
if (!steal && ev.getActionMasked() == MotionEvent.ACTION_DOWN
&& mDownEventListener != null) {
// notify 2-pane that this CV is being interacted (to turn a peek->normal)
mDownEventListener.onConversationViewTouchDown();
}
return steal;
}
@Override
public boolean onTouchEvent(@NonNull MotionEvent ev) {
if (mDownEventListener != null) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
mInterceptedTime = SystemClock.elapsedRealtime();
mInterceptedXDown = ev.getX();
mInterceptedYDown = ev.getY();
break;
case MotionEvent.ACTION_UP:
// Check for a tap
final long timeDelta = SystemClock.elapsedRealtime() - mInterceptedTime;
final float xDelta = ev.getX() - mInterceptedXDown;
final float yDelta = ev.getY() - mInterceptedYDown;
if (timeDelta < ViewConfiguration.getTapTimeout()
&& xDelta < mConfiguration.getScaledTouchSlop()
&& yDelta < mConfiguration.getScaledTouchSlop()) {
mDownEventListener.onConversationViewFrameTapped();
}
}
return true;
}
return false;
}
}
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