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/*
* Copyright (C) 2015 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.tv.ui;
import android.os.Message;
import android.support.annotation.NonNull;
import android.support.v17.leanback.widget.VerticalGridView;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import com.android.tv.common.WeakHandler;
/** Listener to make focus change faster over time. */
public class OnRepeatedKeyInterceptListener implements VerticalGridView.OnKeyInterceptListener {
private static final String TAG = "OnRepeatedKeyListener";
private static final boolean DEBUG = false;
private static final int[] THRESHOLD_FAST_FOCUS_CHANGE_TIME_MS = {2000, 5000};
private static final int[] MAX_SKIPPED_VIEW_COUNT = {1, 4};
private static final int MSG_MOVE_FOCUS = 1000;
private final VerticalGridView mView;
private final MyHandler mHandler = new MyHandler(this);
private int mDirection;
private boolean mFocusAccelerated;
private long mRepeatedKeyInterval;
public OnRepeatedKeyInterceptListener(VerticalGridView view) {
mView = view;
}
public boolean isFocusAccelerated() {
return mFocusAccelerated;
}
@Override
public boolean onInterceptKeyEvent(KeyEvent event) {
mHandler.removeMessages(MSG_MOVE_FOCUS);
if (event.getKeyCode() != KeyEvent.KEYCODE_DPAD_UP
&& event.getKeyCode() != KeyEvent.KEYCODE_DPAD_DOWN) {
return false;
}
long duration = event.getEventTime() - event.getDownTime();
if (duration < THRESHOLD_FAST_FOCUS_CHANGE_TIME_MS[0] || event.isCanceled()) {
mFocusAccelerated = false;
return false;
}
mDirection =
event.getKeyCode() == KeyEvent.KEYCODE_DPAD_UP ? View.FOCUS_UP : View.FOCUS_DOWN;
int skippedViewCount = MAX_SKIPPED_VIEW_COUNT[0];
for (int i = 1; i < THRESHOLD_FAST_FOCUS_CHANGE_TIME_MS.length; ++i) {
if (THRESHOLD_FAST_FOCUS_CHANGE_TIME_MS[i] < duration) {
skippedViewCount = MAX_SKIPPED_VIEW_COUNT[i];
} else {
break;
}
}
if (event.getAction() == KeyEvent.ACTION_DOWN) {
mRepeatedKeyInterval = duration / event.getRepeatCount();
mFocusAccelerated = true;
} else {
// HACK: we move focus skippedViewCount times more even after ACTION_UP. Without this
// hack, a focused view's position doesn't reach to the desired position
// in ProgramGrid.
mFocusAccelerated = false;
}
for (int i = 0; i < skippedViewCount; ++i) {
mHandler.sendEmptyMessageDelayed(
MSG_MOVE_FOCUS, mRepeatedKeyInterval * i / (skippedViewCount + 1));
}
if (DEBUG) Log.d(TAG, "onInterceptKeyEvent: focused view " + mView.findFocus());
return false;
}
private static class MyHandler extends WeakHandler<OnRepeatedKeyInterceptListener> {
private MyHandler(OnRepeatedKeyInterceptListener listener) {
super(listener);
}
@Override
public void handleMessage(Message msg, @NonNull OnRepeatedKeyInterceptListener listener) {
if (msg.what == MSG_MOVE_FOCUS) {
View focused = listener.mView.findFocus();
if (DEBUG) Log.d(TAG, "MSG_MOVE_FOCUS: focused view " + focused);
if (focused != null) {
View v = focused.focusSearch(listener.mDirection);
if (v != null && v != focused) {
v.requestFocus(listener.mDirection);
}
}
}
}
}
}
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