| /* |
| * Copyright (C) 2016 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.calculator2; |
| |
| import android.animation.Animator; |
| import android.app.Fragment; |
| import android.os.Bundle; |
| import androidx.core.content.ContextCompat; |
| import androidx.recyclerview.widget.RecyclerView; |
| import android.view.LayoutInflater; |
| import android.view.MenuItem; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.Toolbar; |
| |
| import java.util.ArrayList; |
| |
| import static androidx.recyclerview.widget.RecyclerView.SCROLL_STATE_DRAGGING; |
| |
| public class HistoryFragment extends Fragment implements DragLayout.DragCallback { |
| |
| public static final String TAG = "HistoryFragment"; |
| public static final String CLEAR_DIALOG_TAG = "clear"; |
| |
| private final DragController mDragController = new DragController(); |
| |
| private RecyclerView mRecyclerView; |
| private HistoryAdapter mAdapter; |
| private DragLayout mDragLayout; |
| |
| private Evaluator mEvaluator; |
| |
| private ArrayList<HistoryItem> mDataSet = new ArrayList<>(); |
| |
| private boolean mIsDisplayEmpty; |
| |
| @Override |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| mAdapter = new HistoryAdapter(mDataSet); |
| } |
| |
| @Override |
| public View onCreateView(LayoutInflater inflater, ViewGroup container, |
| Bundle savedInstanceState) { |
| final View view = inflater.inflate( |
| R.layout.fragment_history, container, false /* attachToRoot */); |
| |
| mDragLayout = (DragLayout) container.getRootView().findViewById(R.id.drag_layout); |
| mDragLayout.addDragCallback(this); |
| |
| mRecyclerView = (RecyclerView) view.findViewById(R.id.history_recycler_view); |
| mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() { |
| @Override |
| public void onScrollStateChanged(RecyclerView recyclerView, int newState) { |
| if (newState == SCROLL_STATE_DRAGGING) { |
| stopActionModeOrContextMenu(); |
| } |
| super.onScrollStateChanged(recyclerView, newState); |
| } |
| }); |
| |
| // The size of the RecyclerView is not affected by the adapter's contents. |
| mRecyclerView.setHasFixedSize(true); |
| mRecyclerView.setAdapter(mAdapter); |
| |
| final Toolbar toolbar = (Toolbar) view.findViewById(R.id.history_toolbar); |
| toolbar.inflateMenu(R.menu.fragment_history); |
| toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() { |
| @Override |
| public boolean onMenuItemClick(MenuItem item) { |
| if (item.getItemId() == R.id.menu_clear_history) { |
| final Calculator calculator = (Calculator) getActivity(); |
| AlertDialogFragment.showMessageDialog(calculator, "" /* title */, |
| getString(R.string.dialog_clear), |
| getString(R.string.menu_clear_history), |
| CLEAR_DIALOG_TAG); |
| return true; |
| } |
| return onOptionsItemSelected(item); |
| } |
| }); |
| toolbar.setNavigationOnClickListener(new View.OnClickListener() { |
| @Override |
| public void onClick(View v) { |
| getActivity().onBackPressed(); |
| } |
| }); |
| return view; |
| } |
| |
| @Override |
| public void onActivityCreated(Bundle savedInstanceState) { |
| super.onActivityCreated(savedInstanceState); |
| |
| final Calculator activity = (Calculator) getActivity(); |
| mEvaluator = Evaluator.getInstance(activity); |
| mAdapter.setEvaluator(mEvaluator); |
| |
| final boolean isResultLayout = activity.isResultLayout(); |
| final boolean isOneLine = activity.isOneLine(); |
| |
| // Snapshot display state here. For the rest of the lifecycle of this current |
| // HistoryFragment, this is what we will consider the display state. |
| // In rare cases, the display state can change after our adapter is initialized. |
| final CalculatorExpr mainExpr = mEvaluator.getExpr(Evaluator.MAIN_INDEX); |
| mIsDisplayEmpty = mainExpr == null || mainExpr.isEmpty(); |
| |
| initializeController(isResultLayout, isOneLine, mIsDisplayEmpty); |
| |
| final long maxIndex = mEvaluator.getMaxIndex(); |
| |
| final ArrayList<HistoryItem> newDataSet = new ArrayList<>(); |
| |
| if (!mIsDisplayEmpty && !isResultLayout) { |
| // Add the current expression as the first element in the list (the layout is |
| // reversed and we want the current expression to be the last one in the |
| // RecyclerView). |
| // If we are in the result state, the result will animate to the last history |
| // element in the list and there will be no "Current Expression." |
| mEvaluator.copyMainToHistory(); |
| newDataSet.add(new HistoryItem(Evaluator.HISTORY_MAIN_INDEX, |
| System.currentTimeMillis(), mEvaluator.getExprAsSpannable(0))); |
| } |
| for (long i = 0; i < maxIndex; ++i) { |
| newDataSet.add(null); |
| } |
| final boolean isEmpty = newDataSet.isEmpty(); |
| mRecyclerView.setBackgroundColor(ContextCompat.getColor(activity, |
| isEmpty ? R.color.empty_history_color : R.color.display_background_color)); |
| if (isEmpty) { |
| newDataSet.add(new HistoryItem()); |
| } |
| mDataSet = newDataSet; |
| mAdapter.setDataSet(mDataSet); |
| mAdapter.setIsResultLayout(isResultLayout); |
| mAdapter.setIsOneLine(activity.isOneLine()); |
| mAdapter.setIsDisplayEmpty(mIsDisplayEmpty); |
| mAdapter.notifyDataSetChanged(); |
| } |
| |
| @Override |
| public void onStart() { |
| super.onStart(); |
| |
| final Calculator activity = (Calculator) getActivity(); |
| mDragController.initializeAnimation(activity.isResultLayout(), activity.isOneLine(), |
| mIsDisplayEmpty); |
| } |
| |
| @Override |
| public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) { |
| return mDragLayout.createAnimator(enter); |
| } |
| |
| @Override |
| public void onDestroy() { |
| super.onDestroy(); |
| |
| if (mDragLayout != null) { |
| mDragLayout.removeDragCallback(this); |
| } |
| |
| if (mEvaluator != null) { |
| // Note that the view is destroyed when the fragment backstack is popped, so |
| // these are essentially called when the DragLayout is closed. |
| mEvaluator.cancelNonMain(); |
| } |
| } |
| |
| private void initializeController(boolean isResult, boolean isOneLine, boolean isDisplayEmpty) { |
| mDragController.setDisplayFormula( |
| (CalculatorFormula) getActivity().findViewById(R.id.formula)); |
| mDragController.setDisplayResult( |
| (CalculatorResult) getActivity().findViewById(R.id.result)); |
| mDragController.setToolbar(getActivity().findViewById(R.id.toolbar)); |
| mDragController.setEvaluator(mEvaluator); |
| mDragController.initializeController(isResult, isOneLine, isDisplayEmpty); |
| } |
| |
| public boolean stopActionModeOrContextMenu() { |
| if (mRecyclerView == null) { |
| return false; |
| } |
| for (int i = 0; i < mRecyclerView.getChildCount(); i++) { |
| final View view = mRecyclerView.getChildAt(i); |
| final HistoryAdapter.ViewHolder viewHolder = |
| (HistoryAdapter.ViewHolder) mRecyclerView.getChildViewHolder(view); |
| if (viewHolder != null && viewHolder.getResult() != null |
| && viewHolder.getResult().stopActionModeOrContextMenu()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /* Begin override DragCallback methods. */ |
| |
| @Override |
| public void onStartDraggingOpen() { |
| // no-op |
| } |
| |
| @Override |
| public void onInstanceStateRestored(boolean isOpen) { |
| if (isOpen) { |
| mRecyclerView.setVisibility(View.VISIBLE); |
| } |
| } |
| |
| @Override |
| public void whileDragging(float yFraction) { |
| if (isVisible() || isRemoving()) { |
| mDragController.animateViews(yFraction, mRecyclerView); |
| } |
| } |
| |
| @Override |
| public boolean shouldCaptureView(View view, int x, int y) { |
| return !mRecyclerView.canScrollVertically(1 /* scrolling down */); |
| } |
| |
| @Override |
| public int getDisplayHeight() { |
| return 0; |
| } |
| |
| /* End override DragCallback methods. */ |
| } |