/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.calculator2;
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import android.animation.Animator;
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import android.app.Fragment;
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import android.os.Bundle;
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import androidx.core.content.ContextCompat;
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import androidx.recyclerview.widget.RecyclerView;
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import android.view.LayoutInflater;
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import android.view.MenuItem;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.Toolbar;
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import java.util.ArrayList;
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import static androidx.recyclerview.widget.RecyclerView.SCROLL_STATE_DRAGGING;
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public class HistoryFragment extends Fragment implements DragLayout.DragCallback {
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public static final String TAG = "HistoryFragment";
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public static final String CLEAR_DIALOG_TAG = "clear";
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private final DragController mDragController = new DragController();
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private RecyclerView mRecyclerView;
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private HistoryAdapter mAdapter;
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private DragLayout mDragLayout;
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private Evaluator mEvaluator;
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private ArrayList<HistoryItem> mDataSet = new ArrayList<>();
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private boolean mIsDisplayEmpty;
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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mAdapter = new HistoryAdapter(mDataSet);
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}
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@Override
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public View onCreateView(LayoutInflater inflater, ViewGroup container,
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Bundle savedInstanceState) {
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final View view = inflater.inflate(
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R.layout.fragment_history, container, false /* attachToRoot */);
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mDragLayout = (DragLayout) container.getRootView().findViewById(R.id.drag_layout);
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mDragLayout.addDragCallback(this);
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mRecyclerView = (RecyclerView) view.findViewById(R.id.history_recycler_view);
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mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
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@Override
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public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
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if (newState == SCROLL_STATE_DRAGGING) {
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stopActionModeOrContextMenu();
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}
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super.onScrollStateChanged(recyclerView, newState);
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}
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});
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// The size of the RecyclerView is not affected by the adapter's contents.
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mRecyclerView.setHasFixedSize(true);
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mRecyclerView.setAdapter(mAdapter);
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final Toolbar toolbar = (Toolbar) view.findViewById(R.id.history_toolbar);
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toolbar.inflateMenu(R.menu.fragment_history);
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toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
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@Override
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public boolean onMenuItemClick(MenuItem item) {
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if (item.getItemId() == R.id.menu_clear_history) {
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final Calculator calculator = (Calculator) getActivity();
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AlertDialogFragment.showMessageDialog(calculator, "" /* title */,
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getString(R.string.dialog_clear),
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getString(R.string.menu_clear_history),
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CLEAR_DIALOG_TAG);
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return true;
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}
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return onOptionsItemSelected(item);
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}
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});
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toolbar.setNavigationOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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getActivity().onBackPressed();
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}
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});
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return view;
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}
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@Override
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public void onActivityCreated(Bundle savedInstanceState) {
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super.onActivityCreated(savedInstanceState);
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final Calculator activity = (Calculator) getActivity();
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mEvaluator = Evaluator.getInstance(activity);
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mAdapter.setEvaluator(mEvaluator);
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final boolean isResultLayout = activity.isResultLayout();
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final boolean isOneLine = activity.isOneLine();
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// Snapshot display state here. For the rest of the lifecycle of this current
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// HistoryFragment, this is what we will consider the display state.
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// In rare cases, the display state can change after our adapter is initialized.
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final CalculatorExpr mainExpr = mEvaluator.getExpr(Evaluator.MAIN_INDEX);
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mIsDisplayEmpty = mainExpr == null || mainExpr.isEmpty();
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initializeController(isResultLayout, isOneLine, mIsDisplayEmpty);
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final long maxIndex = mEvaluator.getMaxIndex();
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final ArrayList<HistoryItem> newDataSet = new ArrayList<>();
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if (!mIsDisplayEmpty && !isResultLayout) {
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// Add the current expression as the first element in the list (the layout is
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// reversed and we want the current expression to be the last one in the
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// RecyclerView).
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// If we are in the result state, the result will animate to the last history
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// element in the list and there will be no "Current Expression."
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mEvaluator.copyMainToHistory();
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newDataSet.add(new HistoryItem(Evaluator.HISTORY_MAIN_INDEX,
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System.currentTimeMillis(), mEvaluator.getExprAsSpannable(0)));
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}
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for (long i = 0; i < maxIndex; ++i) {
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newDataSet.add(null);
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}
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final boolean isEmpty = newDataSet.isEmpty();
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mRecyclerView.setBackgroundColor(ContextCompat.getColor(activity,
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isEmpty ? R.color.empty_history_color : R.color.display_background_color));
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if (isEmpty) {
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newDataSet.add(new HistoryItem());
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}
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mDataSet = newDataSet;
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mAdapter.setDataSet(mDataSet);
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mAdapter.setIsResultLayout(isResultLayout);
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mAdapter.setIsOneLine(activity.isOneLine());
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mAdapter.setIsDisplayEmpty(mIsDisplayEmpty);
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mAdapter.notifyDataSetChanged();
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}
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@Override
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public void onStart() {
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super.onStart();
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final Calculator activity = (Calculator) getActivity();
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mDragController.initializeAnimation(activity.isResultLayout(), activity.isOneLine(),
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mIsDisplayEmpty);
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}
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@Override
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public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) {
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return mDragLayout.createAnimator(enter);
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}
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@Override
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public void onDestroy() {
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super.onDestroy();
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if (mDragLayout != null) {
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mDragLayout.removeDragCallback(this);
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}
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if (mEvaluator != null) {
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// Note that the view is destroyed when the fragment backstack is popped, so
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// these are essentially called when the DragLayout is closed.
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mEvaluator.cancelNonMain();
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}
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}
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private void initializeController(boolean isResult, boolean isOneLine, boolean isDisplayEmpty) {
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mDragController.setDisplayFormula(
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(CalculatorFormula) getActivity().findViewById(R.id.formula));
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mDragController.setDisplayResult(
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(CalculatorResult) getActivity().findViewById(R.id.result));
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mDragController.setToolbar(getActivity().findViewById(R.id.toolbar));
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mDragController.setEvaluator(mEvaluator);
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mDragController.initializeController(isResult, isOneLine, isDisplayEmpty);
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}
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public boolean stopActionModeOrContextMenu() {
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if (mRecyclerView == null) {
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return false;
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}
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for (int i = 0; i < mRecyclerView.getChildCount(); i++) {
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final View view = mRecyclerView.getChildAt(i);
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final HistoryAdapter.ViewHolder viewHolder =
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(HistoryAdapter.ViewHolder) mRecyclerView.getChildViewHolder(view);
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if (viewHolder != null && viewHolder.getResult() != null
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&& viewHolder.getResult().stopActionModeOrContextMenu()) {
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return true;
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}
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}
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return false;
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}
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/* Begin override DragCallback methods. */
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@Override
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public void onStartDraggingOpen() {
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// no-op
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}
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@Override
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public void onInstanceStateRestored(boolean isOpen) {
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if (isOpen) {
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mRecyclerView.setVisibility(View.VISIBLE);
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}
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}
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@Override
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public void whileDragging(float yFraction) {
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if (isVisible() || isRemoving()) {
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mDragController.animateViews(yFraction, mRecyclerView);
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}
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}
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@Override
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public boolean shouldCaptureView(View view, int x, int y) {
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return !mRecyclerView.canScrollVertically(1 /* scrolling down */);
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}
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@Override
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public int getDisplayHeight() {
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return 0;
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}
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/* End override DragCallback methods. */
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}
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