/
DemoFragment.java
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/
DemoFragment.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.feature;
import io.material.catalog.R;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.Nullable;
import androidx.annotation.StringRes;
import androidx.core.view.ViewCompat;
import dagger.android.AndroidInjector;
import dagger.android.DispatchingAndroidInjector;
import dagger.android.HasAndroidInjector;
import dagger.android.support.AndroidSupportInjection;
import io.material.catalog.preferences.CatalogPreferencesHelper;
import io.material.catalog.preferences.CatalogPreferencesHelper.PreferencesFragment;
import javax.inject.Inject;
/** Base Fragment class that provides a demo screen structure for a single demo. */
public abstract class DemoFragment extends Fragment
implements PreferencesFragment, HasAndroidInjector {
public static final String ARG_DEMO_TITLE = "demo_title";
private static final int MEMORY_POLLING_INTERVAL_MS = 1500;
private static final float SWIPE_MIN_DISTANCE_PX = 50;
private static final float SWIPE_MIN_VELOCITY = 50;
private Toolbar toolbar;
private ViewGroup demoContainer;
@Inject DispatchingAndroidInjector<Object> childFragmentInjector;
@Nullable private CatalogPreferencesHelper catalogPreferencesHelper;
@Nullable private GestureDetector gestureDetector;
@Nullable private MemoryView memoryWidget;
@Nullable private ViewScheduler viewScheduler;
@Override
public void onAttach(Context context) {
safeInject();
super.onAttach(context);
catalogPreferencesHelper = new CatalogPreferencesHelper(this);
}
@StringRes
public int getDemoTitleResId() {
return 0;
}
@Nullable
@Override
@SuppressLint("ClickableViewAccessibility") // Keep this hidden from a11y services for now.
public View onCreateView(
LayoutInflater layoutInflater, @Nullable ViewGroup viewGroup, @Nullable Bundle bundle) {
View view =
layoutInflater.inflate(R.layout.cat_demo_fragment, viewGroup, false /* attachToRoot */);
Bundle arguments = getArguments();
if (arguments != null) {
String transitionName = arguments.getString(FeatureDemoUtils.ARG_TRANSITION_NAME);
ViewCompat.setTransitionName(view, transitionName);
}
toolbar = view.findViewById(R.id.toolbar);
// show a memory widget on Kitkat
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {
gestureDetector = new GestureDetector(getContext(), new GestureListener());
memoryWidget = view.findViewById(R.id.memorymonitor_widget);
toolbar.setOnTouchListener((v, event) -> gestureDetector.onTouchEvent(event));
viewScheduler = new ViewScheduler();
}
demoContainer = view.findViewById(R.id.cat_demo_fragment_container);
initDemoActionBar();
demoContainer.addView(onCreateDemoView(layoutInflater, viewGroup, bundle));
ViewGroup children = (ViewGroup) demoContainer.getChildAt(0);
DemoUtils.addBottomSpaceInsetsIfNeeded(children, demoContainer);
return view;
}
@Override
public void onStop() {
super.onStop();
if (viewScheduler != null) {
viewScheduler.cancel();
}
}
/**
* Whether this fragment wants to use the default demo action bar, or if the fragment wants to use
* its own Toolbar as the action bar.
*/
@Override
public boolean shouldShowDefaultDemoActionBar() {
return true;
}
@Override
public AndroidInjector<Object> androidInjector() {
return childFragmentInjector;
}
private void safeInject() {
try {
AndroidSupportInjection.inject(this);
} catch (Exception e) {
// Ignore exception, not all DemoFragment subclasses need to inject
}
}
private void initDemoActionBar() {
if (shouldShowDefaultDemoActionBar()) {
AppCompatActivity activity = (AppCompatActivity) getActivity();
activity.setSupportActionBar(toolbar);
setDemoActionBarTitle(activity.getSupportActionBar());
} else {
toolbar.setVisibility(View.GONE);
}
}
private void setDemoActionBarTitle(ActionBar actionBar) {
if (getDemoTitleResId() != 0) {
actionBar.setTitle(getDemoTitleResId());
} else {
actionBar.setTitle(getDefaultDemoTitle());
}
}
protected String getDefaultDemoTitle() {
Bundle args = getArguments();
if (args != null) {
return args.getString(ARG_DEMO_TITLE, "");
} else {
return "";
}
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater menuInflater) {
super.onCreateOptionsMenu(menu, menuInflater);
catalogPreferencesHelper.onCreateOptionsMenu(menu, menuInflater);
}
@Override
public boolean onOptionsItemSelected(MenuItem menuItem) {
return catalogPreferencesHelper.onOptionsItemSelected(menuItem)
|| super.onOptionsItemSelected(menuItem);
}
public abstract View onCreateDemoView(
LayoutInflater layoutInflater, @Nullable ViewGroup viewGroup, @Nullable Bundle bundle);
private final class GestureListener extends GestureDetector.SimpleOnGestureListener {
private final FragmentActivity activity = getActivity();
private final Runnable listener =
() ->
activity.runOnUiThread(
() -> {
memoryWidget.refreshMemStats(Runtime.getRuntime());
});
private boolean memoryWidgetShown;
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
if (e2.getY() - e1.getY() < SWIPE_MIN_DISTANCE_PX
|| Math.abs(velocityY) < SWIPE_MIN_VELOCITY
|| memoryWidgetShown) {
return false;
}
memoryWidgetShown = true;
viewScheduler.start(listener, MEMORY_POLLING_INTERVAL_MS);
memoryWidget.setVisibility(View.VISIBLE);
return true;
}
}
}