/
TocFragment.java
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/
TocFragment.java
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/*
* Copyright 2017 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 io.material.catalog.tableofcontents;
import io.material.catalog.R;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.appcompat.widget.Toolbar;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import androidx.annotation.Nullable;
import androidx.core.content.ContextCompat;
import androidx.core.math.MathUtils;
import androidx.core.view.ViewCompat;
import com.google.android.material.appbar.AppBarLayout;
import dagger.android.support.DaggerFragment;
import io.material.catalog.feature.FeatureDemo;
import io.material.catalog.feature.FeatureDemoUtils;
import io.material.catalog.preferences.CatalogPreferencesDialogFragment;
import io.material.catalog.windowpreferences.WindowPreferencesManager;
import java.text.Collator;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import javax.inject.Inject;
/** Initial table of contents screen for the catalog app. */
public class TocFragment extends DaggerFragment {
private static final int GRID_SPAN_COUNT_MIN = 1;
private static final int GRID_SPAN_COUNT_MAX = 4;
@Inject Set<FeatureDemo> featureDemos;
@Inject TocResourceProvider tocResourceProvider;
private WindowPreferencesManager windowPreferencesManager;
private AppBarLayout appBarLayout;
private View gridTopDivider;
private RecyclerView recyclerView;
private ImageButton preferencesButton;
private ImageButton edgeToEdgeButton;
@Override
public void onCreate(@Nullable Bundle bundle) {
super.onCreate(bundle);
windowPreferencesManager = new WindowPreferencesManager(getContext());
String defaultDemo = FeatureDemoUtils.getDefaultDemo(getContext());
if (!defaultDemo.isEmpty() && bundle == null) {
for (FeatureDemo demo : featureDemos) {
Fragment fragment = demo.createFragment();
String key = fragment.getClass().getName();
if (key.equals(defaultDemo)) {
FeatureDemoUtils.startFragment(getActivity(), fragment, "fragment_content");
return;
}
}
}
}
@Nullable
@Override
public View onCreateView(
LayoutInflater layoutInflater, @Nullable ViewGroup viewGroup, @Nullable Bundle bundle) {
View view =
layoutInflater.inflate(R.layout.cat_toc_fragment, viewGroup, false /* attachToRoot */);
Toolbar toolbar = view.findViewById(R.id.toolbar);
AppCompatActivity activity = (AppCompatActivity) getActivity();
activity.setSupportActionBar(toolbar);
activity.getSupportActionBar().setDisplayShowTitleEnabled(false);
ViewGroup content = view.findViewById(R.id.content);
View.inflate(getContext(), tocResourceProvider.getHeaderContent(), content);
appBarLayout = view.findViewById(R.id.cat_toc_app_bar_layout);
gridTopDivider = view.findViewById(R.id.cat_toc_grid_top_divider);
recyclerView = view.findViewById(R.id.cat_toc_grid);
preferencesButton = view.findViewById(R.id.cat_toc_preferences_button);
edgeToEdgeButton = view.findViewById(R.id.cat_edge_to_edge_button);
ViewCompat.setOnApplyWindowInsetsListener(
view,
(v, insetsCompat) -> {
appBarLayout
.findViewById(R.id.cat_toc_collapsingtoolbarlayout)
.setPadding(0, insetsCompat.getSystemWindowInsetTop(), 0, 0);
return insetsCompat;
});
if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
addGridTopDividerVisibilityListener();
} else {
gridTopDivider.setVisibility(View.VISIBLE);
}
final int gridSpanCount = calculateGridSpanCount();
recyclerView.setLayoutManager(new GridLayoutManager(getContext(), gridSpanCount));
recyclerView.addItemDecoration(
new GridDividerDecoration(
getResources().getDimensionPixelSize(R.dimen.cat_toc_grid_divider_size),
ContextCompat.getColor(getContext(), R.color.cat_toc_grid_divider_color),
gridSpanCount));
List<FeatureDemo> featureList = new ArrayList<>(featureDemos);
// Sort features alphabetically
Collator collator = Collator.getInstance();
Collections.sort(
featureList,
(feature1, feature2) ->
collator.compare(
getContext().getString(feature1.getTitleResId()),
getContext().getString(feature2.getTitleResId())));
TocAdapter tocAdapter = new TocAdapter(getActivity(), featureList);
recyclerView.setAdapter(tocAdapter);
initPreferencesButton();
initEdgeToEdgeButton();
return view;
}
@Override
public void onDestroyView() {
super.onDestroyView();
((AppCompatActivity) getActivity()).setSupportActionBar(null);
}
private void addGridTopDividerVisibilityListener() {
appBarLayout.addOnOffsetChangedListener(
(appBarLayout, verticalOffset) -> {
if (Math.abs(verticalOffset) == appBarLayout.getTotalScrollRange()) {
// CTL is collapsed, hide top divider
gridTopDivider.setVisibility(View.GONE);
} else {
// CTL is expanded or expanding, show top divider
gridTopDivider.setVisibility(View.VISIBLE);
}
});
}
private int calculateGridSpanCount() {
DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
int displayWidth = displayMetrics.widthPixels;
int itemSize = getResources().getDimensionPixelSize(R.dimen.cat_toc_item_size);
int gridSpanCount = displayWidth / itemSize;
return MathUtils.clamp(gridSpanCount, GRID_SPAN_COUNT_MIN, GRID_SPAN_COUNT_MAX);
}
private void initPreferencesButton() {
preferencesButton.setOnClickListener(
v -> new CatalogPreferencesDialogFragment().show(
getParentFragmentManager(), "preferences-screen"));
}
private void initEdgeToEdgeButton() {
if (VERSION.SDK_INT < VERSION_CODES.LOLLIPOP) {
// Hide button because setting system ui flags is not supported pre-Lollipop.
edgeToEdgeButton.setVisibility(View.GONE);
return;
}
edgeToEdgeButton.setImageResource(
windowPreferencesManager.isEdgeToEdgeEnabled()
? R.drawable.ic_edge_to_edge_disable_24dp
: R.drawable.ic_edge_to_edge_enable_24dp);
edgeToEdgeButton.setContentDescription(
getString(
windowPreferencesManager.isEdgeToEdgeEnabled()
? R.string.cat_edge_to_edge_enable_description
: R.string.cat_edge_to_edge_disable_description));
edgeToEdgeButton.setOnClickListener(
v -> {
windowPreferencesManager.toggleEdgeToEdgeEnabled();
getActivity().recreate();
});
}
}