Java tutorial
/* * Copyright 2013 serso aka se.solovyev * * 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. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * Contact details * * Email: se.solovyev@gmail.com * Site: http://se.solovyev.org */ package org.solovyev.android.calculator.history; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.app.FragmentActivity; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.text.ClipboardManager; import android.text.format.DateUtils; import android.view.*; import android.widget.TextView; import butterknife.Bind; import butterknife.ButterKnife; import com.squareup.otto.Bus; import com.squareup.otto.Subscribe; import org.solovyev.android.Check; import org.solovyev.android.calculator.*; import org.solovyev.android.calculator.jscl.JsclOperation; import org.solovyev.android.views.DividerItemDecoration; import org.solovyev.common.text.Strings; import javax.annotation.Nonnull; import javax.annotation.Nullable; import javax.inject.Inject; import java.util.List; import static android.view.View.GONE; import static android.view.View.VISIBLE; public abstract class BaseHistoryFragment extends BaseFragment { private final boolean recentHistory; @Inject History history; @Inject Editor editor; @Inject Bus bus; @Bind(R.id.history_recyclerview) RecyclerView recyclerView; private HistoryAdapter adapter; protected BaseHistoryFragment(boolean recentHistory) { super(R.layout.fragment_history); this.recentHistory = recentHistory; } @Override protected void inject(@Nonnull AppComponent component) { super.inject(component); component.inject(this); } @Nonnull public static String getHistoryText(@Nonnull HistoryState state) { return state.editor.getTextString() + getIdentitySign(state.display.getOperation()) + state.display.text; } @Nonnull private static String getIdentitySign(@Nonnull JsclOperation operation) { return operation == JsclOperation.simplify ? "" : "="; } public void useState(@Nonnull final HistoryState state) { editor.setState(state.editor); final FragmentActivity activity = getActivity(); if (!(activity instanceof CalculatorActivity)) { activity.finish(); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final View view = super.onCreateView(inflater, container, savedInstanceState); ButterKnife.bind(this, view); final Context context = inflater.getContext(); adapter = new HistoryAdapter(context); bus.register(adapter); recyclerView.setLayoutManager(new LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false)); recyclerView.setAdapter(adapter); recyclerView.addItemDecoration(new DividerItemDecoration(context, null)); return view; } @SuppressWarnings("deprecation") protected final void copyResult(@Nonnull HistoryState state) { final Context context = getActivity(); final String displayText = state.display.text; if (Strings.isEmpty(displayText)) { return; } final ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Activity.CLIPBOARD_SERVICE); clipboard.setText(displayText); } @Override public void onDestroyView() { bus.unregister(adapter); super.onDestroyView(); } @SuppressWarnings("deprecation") protected final void copyExpression(@Nonnull HistoryState state) { final Context context = getActivity(); final String editorText = state.editor.getTextString(); if (Strings.isEmpty(editorText)) { return; } final ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Activity.CLIPBOARD_SERVICE); clipboard.setText(editorText); } protected final boolean shouldHaveCopyResult(@Nonnull HistoryState state) { return !state.display.valid || !Strings.isEmpty(state.display.text); } public class HistoryViewHolder extends RecyclerView.ViewHolder implements View.OnCreateContextMenuListener, View.OnClickListener, MenuItem.OnMenuItemClickListener { private static final int DATETIME_FORMAT = DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_MONTH | DateUtils.FORMAT_ABBREV_TIME; @Bind(R.id.history_item_value) TextView valueView; @Bind(R.id.history_item_comment) TextView commentView; @Bind(R.id.history_item_time) TextView timeView; @Nullable private HistoryState state; public HistoryViewHolder(View view) { super(view); ButterKnife.bind(this, view); view.setOnCreateContextMenuListener(this); view.setOnClickListener(this); } void bind(@Nonnull HistoryState state) { this.state = state; valueView.setText(BaseHistoryFragment.getHistoryText(state)); timeView.setText(DateUtils.formatDateTime(getContext(), state.getTime(), DATETIME_FORMAT)); final String comment = state.getComment(); if (!Strings.isEmpty(comment)) { commentView.setText(comment); commentView.setVisibility(VISIBLE); } else { commentView.setText(null); commentView.setVisibility(GONE); } } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { Check.isNotNull(state); if (recentHistory) { addMenu(menu, R.string.c_use, this); addMenu(menu, R.string.c_copy_expression, this); if (shouldHaveCopyResult(state)) { addMenu(menu, R.string.c_copy_result, this); } addMenu(menu, R.string.c_save, this); } else { addMenu(menu, R.string.c_use, this); addMenu(menu, R.string.c_copy_expression, this); if (shouldHaveCopyResult(state)) { addMenu(menu, R.string.c_copy_result, this); } addMenu(menu, R.string.cpp_edit, this); addMenu(menu, R.string.cpp_delete, this); } } @Override public void onClick(View v) { Check.isNotNull(state); useState(state); } @Override public boolean onMenuItemClick(MenuItem item) { Check.isNotNull(state); switch (item.getItemId()) { case R.string.c_use: useState(state); return true; case R.string.c_copy_expression: copyExpression(state); return true; case R.string.c_copy_result: copyResult(state); return true; case R.string.cpp_edit: EditHistoryFragment.show(state, false, getFragmentManager()); return true; case R.string.c_save: EditHistoryFragment.show(state, true, getFragmentManager()); return true; case R.string.cpp_delete: history.removeSaved(state); return true; } return false; } } public class HistoryAdapter extends RecyclerView.Adapter<HistoryViewHolder> { @NonNull private final LayoutInflater inflater; @NonNull private final List<HistoryState> list; public HistoryAdapter(@NonNull Context context) { inflater = LayoutInflater.from(context); list = loadHistory(); setHasStableIds(true); } @NonNull private List<HistoryState> loadHistory() { return recentHistory ? history.getRecent() : history.getSaved(); } @Override public HistoryViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { return new HistoryViewHolder(inflater.inflate(R.layout.fragment_history_item, parent, false)); } @Override public void onBindViewHolder(HistoryViewHolder holder, int position) { holder.bind(list.get(position)); } @Override public long getItemId(int position) { return list.get(position).hashCode(); } @Override public int getItemCount() { return list.size(); } @Subscribe public void onHistoryCleared(@Nonnull History.ClearedEvent e) { if (e.recent != recentHistory) { return; } list.clear(); notifyDataSetChanged(); } @Subscribe public void onHistoryAdded(@Nonnull History.AddedEvent e) { if (e.recent != recentHistory) { return; } list.add(e.state); notifyItemInserted(0); } @Subscribe public void onHistoryUpdated(@Nonnull History.UpdatedEvent e) { if (e.recent != recentHistory) { return; } final int i = list.indexOf(e.state); if (i >= 0) { list.set(i, e.state); notifyItemChanged(i); } } @Subscribe public void onHistoryRemoved(@Nonnull History.RemovedEvent e) { if (e.recent != recentHistory) { return; } final int i = list.indexOf(e.state); if (i >= 0) { list.remove(i); notifyItemRemoved(i); } } } }