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/*
* Copyright (C) 2021 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.car.rotaryplayground;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListPopupWindow;
import android.widget.ListView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import com.android.car.ui.FocusParkingView;
/** Fragment to demo a popup window. */
public class PopupWindowFragment extends Fragment {
private static final String[] ACTIONS = {"Action 1", "Action 2", "Action 3"};
private static final int WINDOW_WIDTH = 300;
private static final int WINDOW_HEIGHT = 400;
@NonNull
private ListPopupWindow mPopupWindow;
@Nullable
private ListView mListView;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.popup_window_fragment, container, false);
Button overflow = view.findViewById(R.id.overflow);
mPopupWindow = new ListPopupWindow(getActivity());
mPopupWindow.setAdapter(new ArrayAdapter<>(getActivity(), R.layout.list_item, ACTIONS));
mPopupWindow.setAnchorView(overflow);
mPopupWindow.setWidth(WINDOW_WIDTH);
mPopupWindow.setHeight(WINDOW_HEIGHT);
mPopupWindow.setModal(true);
mPopupWindow.setOnItemClickListener((parent, v, position, id) -> {
Toast.makeText(getActivity(), ACTIONS[position], Toast.LENGTH_SHORT).show();
mPopupWindow.dismiss();
});
overflow.setOnClickListener((v) -> {
mPopupWindow.show();
mListView = mPopupWindow.getListView();
if (mListView != null && mListView.isFocused()) {
initRotaryMode();
}
});
return view;
}
/**
* Initializes the popup window to support rotary controller rotations and nudges.
* <p>
* In rotary mode the first focusable element in the ListView should be focused automatically
* when the popup window shows up. However, in {@link ListPopupWindow#show}, Android framework
* creates the ListView, sets it focusable, then focuses on it automatically. What's worse,
* ListView doesn't handle focusSearch() properly, causing rotation fails once it's focused.
* To work around it, move focus to its first focusable element, then set the ListView
* to not be focusable.
*/
private void initRotaryMode() {
if (mListView == null) {
return;
}
// Add a FocusParkingView to prevent rotary controller rotation wrap-around.
View root = mListView.getRootView();
if (root instanceof ViewGroup) {
ViewGroup rootView = (ViewGroup) root;
FocusParkingView fpv = new FocusParkingView(getActivity());
// This popup window can be dismissed by controller nudges.
fpv.setOnPopupWindowDismiss(() -> mPopupWindow.dismiss());
rootView.addView(fpv);
}
// At this time the elements in the list are not loaded yet. Because there is no callbacks
// to notify whether the elements are loaded, use an OnPreDrawListener as workaround.
ViewTreeObserver.OnPreDrawListener listeners[] =
new ViewTreeObserver.OnPreDrawListener[1];
listeners[0] = (() -> {
boolean focusInitialized = false;
for (int i = 0; i < mListView.getChildCount(); i++) {
View child = mListView.getChildAt(i);
if (child != null) {
// Because the elements are set focusable, they'll steal click events from the
// list, so they need to handle the events on their own.
int position = i;
child.setOnClickListener(v -> mPopupWindow.performItemClick(position));
// Move focus to the first focusable element and set the list non-focussable.
if (!focusInitialized) {
focusInitialized = child.requestFocus();
if (focusInitialized) {
mListView.setFocusable(false);
mListView.getViewTreeObserver().removeOnPreDrawListener(listeners[0]);
}
}
}
}
return true;
});
mListView.getViewTreeObserver().addOnPreDrawListener(listeners[0]);
}
}
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