Add bookmark search feature to enhanced bookmark

chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkSearchView.java

Index: chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkSearchView.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkSearchView.java b/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkSearchView.java
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index 0000000000000000000000000000000000000000..9fe245baec5dfd7d03d2e4d82fdc105ed897f957
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@@ -0,0 +1,406 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.enhancedbookmarks;
+
+import android.content.Context;
+import android.preference.PreferenceManager;
+import android.support.v7.widget.Toolbar;
+import android.text.Editable;
+import android.text.TextUtils;
+import android.text.TextWatcher;
+import android.util.AttributeSet;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.ViewGroup;
+import android.view.inputmethod.EditorInfo;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.ArrayAdapter;
+import android.widget.BaseAdapter;
+import android.widget.EditText;
+import android.widget.LinearLayout;
+import android.widget.ListView;
+import android.widget.TextView;
+import android.widget.TextView.OnEditorActionListener;
+import android.widget.ViewSwitcher;
+
+import org.chromium.base.ApiCompatibilityUtils;
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.BookmarksBridge.BookmarkItem;
+import org.chromium.chrome.browser.BookmarksBridge.BookmarkModelObserver;
+import org.chromium.chrome.browser.enhancedbookmarks.EnhancedBookmarkSearchRow.SearchHistoryDelegate;
+import org.chromium.components.bookmarks.BookmarkId;
+import org.chromium.ui.UiUtils;
+import org.json.JSONArray;
+import org.json.JSONException;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Activity for searching bookmarks. Search results will be updated when user is typing. Before
+ * typing, a list of search history is shown.
+ */
+public class EnhancedBookmarkSearchView extends LinearLayout implements OnItemClickListener,
+        OnEditorActionListener, EnhancedBookmarkUIObserver, SearchHistoryDelegate {
+    /**
+     * A custom {@link ViewSwitcher} that wraps another {@link ViewSwitcher} inside.
+     */
+    public static class HistoryResultSwitcher extends ViewSwitcher {
+        ViewSwitcher mResultEmptySwitcher;
+
+        /**
+         * Constructor for xml inflation.
+         */
+        public HistoryResultSwitcher(Context context, AttributeSet attrs) {
+            super(context, attrs);
+        }
+
+        @Override
+        protected void onFinishInflate() {
+            super.onFinishInflate();
+            mResultEmptySwitcher = (ViewSwitcher) findViewById(R.id.result_empty_switcher);
+        }
+
+        void showHistory() {
+            if (getCurrentView().getId() == R.id.eb_history_list) return;
+            showNext();
+        }
+
+        void showResult() {
+            if (getCurrentView().getId() == R.id.eb_history_list) showNext();
+            if (mResultEmptySwitcher.getCurrentView().getId() == R.id.eb_search_empty_view) {
+                mResultEmptySwitcher.showNext();
+            }
+        }
+
+        void showEmpty() {
+            if (getCurrentView().getId() == R.id.eb_history_list) showNext();
+            if (mResultEmptySwitcher.getCurrentView().getId() == R.id.eb_result_list) {
+                mResultEmptySwitcher.showNext();
+            }
+        }
+    }
+
+    private static enum UIState {HISTORY, RESULT, EMPTY}
+
+    private static final String PREF_SEARCH_HISTORY = "bookmark_search_history";
+    private static final int SEARCH_HISTORY_MAX_ENTRIES = 10;
+    private static final int HISTORY_ITEM_PADDING_START_DP = 72;
+    private static final int MAXIMUM_NUMBER_OF_RESULTS = 500;
+
+    private EnhancedBookmarksModel mEnhancedBookmarksModel;
+    private EnhancedBookmarkDelegate mDelegate;
+    private EditText mSearchText;
+    private ListView mResultList;
+    private ListView mHistoryList;
+    private HistoryResultSwitcher mHistoryResultSwitcher;
+    private UIState mCurrentUIState;
+
+    private BookmarkModelObserver mModelObserver = new BookmarkModelObserver() {
+        @Override
+        public void bookmarkModelChanged() {
+            if (mCurrentUIState == UIState.RESULT || mCurrentUIState == UIState.EMPTY) {
+                sendSearchQuery();
+            }
+        }
+
+        @Override
+        public void bookmarkNodeRemoved(BookmarkItem parent, int oldIndex, BookmarkItem node,
+                boolean isDoingExtensiveChanges) {
+            // If isDoingExtensiveChanges is false, it will fall back to bookmarkModelChange()
+            if (isDoingExtensiveChanges && mCurrentUIState == UIState.RESULT) {
+                sendSearchQuery();
+            }
+        }
+    };
+
+    /**
+     * Constructor for inflating from XML.
+     */
+    public EnhancedBookmarkSearchView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+        mSearchText = (EditText) findViewById(R.id.eb_search_text);
+        mResultList = (ListView) findViewById(R.id.eb_result_list);
+        mHistoryList = (ListView) findViewById(R.id.eb_history_list);
+        mHistoryResultSwitcher = (HistoryResultSwitcher) findViewById(R.id.history_result_switcher);
+
+        Toolbar searchBar = (Toolbar) findViewById(R.id.search_bar);
+        searchBar.setNavigationIcon(R.drawable.eb_back_normal);
+        searchBar.setNavigationContentDescription(R.string.accessibility_toolbar_btn_back);
+        searchBar.setNavigationOnClickListener(new OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                onBackPressed();
+            }
+        });
+
+        mHistoryList.setOnItemClickListener(this);
+        mSearchText.setOnEditorActionListener(this);
+        mSearchText.addTextChangedListener(new TextWatcher() {
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+            }
+
+            @Override
+            public void afterTextChanged(Editable s) {
+                if (TextUtils.isEmpty(s.toString().trim())) {
+                    resetUI();
+                } else {
+                    sendSearchQuery();
+                }
+            }
+        });
+        mCurrentUIState = UIState.HISTORY;
+    }
+
+    private void updateHistoryList() {
+        mHistoryList.setAdapter(new ArrayAdapter<String>(getContext(),
+                android.R.layout.simple_list_item_1, android.R.id.text1,
+                readHistoryList()) {
+            @Override
+            public View getView(int position, View convertView, ViewGroup parent) {
+                View textView = super.getView(position, convertView, parent);
+                // Set padding start to specific size.
+                int paddingStart = (int) (HISTORY_ITEM_PADDING_START_DP
+                        * getResources().getDisplayMetrics().density);
+                ApiCompatibilityUtils.setPaddingRelative(textView, paddingStart,
+                        textView.getPaddingTop(), textView.getPaddingRight(),
+                        textView.getPaddingBottom());
+                return textView;
+            }
+        });
+    }
+
+    private void resetUI() {
+        setUIState(UIState.HISTORY);
+        mResultList.setAdapter(null);
+        if (!TextUtils.isEmpty(mSearchText.getText())) mSearchText.setText("");
+    }
+
+    private void sendSearchQuery() {
+        String currentText = mSearchText.getText().toString().trim();
+        if (TextUtils.isEmpty(currentText)) return;
+
+        List<BookmarkMatch> results = mEnhancedBookmarksModel.searchBookmarks(currentText,
+                MAXIMUM_NUMBER_OF_RESULTS);
+        populateResultListView(results);
+    }
+
+    @Override
+    public boolean dispatchKeyEvent(KeyEvent event) {
+        // To intercept hardware key, a view must have focus.
+        if (mDelegate == null) return super.dispatchKeyEvent(event);
+
+        if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
+            KeyEvent.DispatcherState state = getKeyDispatcherState();
+            if (state != null) {
+                if (event.getAction() == KeyEvent.ACTION_DOWN && event.getRepeatCount() == 0) {
+                    state.startTracking(event, this);
+                    return true;
+                } else if (event.getAction() == KeyEvent.ACTION_UP && !event.isCanceled()
+                        && state.isTracking(event)) {
+                    onBackPressed();
+                    return true;
+                }
+            }
+        }
+
+        return super.dispatchKeyEvent(event);
+    }
+
+    /**
+     * Make result list visible and popuplate the list with given list of bookmarks.
+     */
+    private void populateResultListView(List<BookmarkMatch> ids) {
+        if (ids.isEmpty()) {
+            setUIState(UIState.EMPTY);
+        } else {
+            setUIState(UIState.RESULT);
+            mResultList.setAdapter(new ResultListAdapter(ids, mDelegate));
+        }
+    }
+
+    private void setUIState(UIState state) {
+        if (mCurrentUIState == state) return;
+        mCurrentUIState = state;
+        if (state == UIState.HISTORY) {
+            mHistoryResultSwitcher.showHistory();
+            updateHistoryList();
+        } else if (state == UIState.RESULT) {
+            mHistoryResultSwitcher.showResult();
+        } else if (state == UIState.EMPTY) {
+            mHistoryResultSwitcher.showEmpty();
+        }
+    }
+
+    @Override
+    protected void onVisibilityChanged(View changedView, int visibility) {
+        super.onVisibilityChanged(changedView, visibility);
+        // This method might be called very early. Null check on bookmark model here.
+        if (mEnhancedBookmarksModel == null) return;
+
+        if (visibility == View.VISIBLE) {
+            mEnhancedBookmarksModel.addObserver(mModelObserver);
+            updateHistoryList();
+            mSearchText.requestFocus();
+            UiUtils.showKeyboard(mSearchText);
+        } else {
+            UiUtils.hideKeyboard(mSearchText);
+            mEnhancedBookmarksModel.removeObserver(mModelObserver);
+            resetUI();
+            clearFocus();
+        }
+    }
+
+    private void onBackPressed() {
+        if (mCurrentUIState == UIState.HISTORY) {
+            mDelegate.closeSearchUI();
+        } else {
+            resetUI();
+        }
+    }
+
+    @Override
+    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        assert parent == mHistoryList : "Only history list should have onItemClickListener.";
+        mSearchText.setText((String) parent.getAdapter().getItem(position));
+    }
+
+    @Override
+    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
+        if (actionId == EditorInfo.IME_ACTION_SEARCH) {
+            // History is saved either when the user clicks search button or a search result is
+            // clicked.
+            saveSearchHistory();
+        }
+        return false;
+    }
+
+    private void saveHistoryList(List<String> history) {
+        JSONArray jsonArray = new JSONArray(history);
+        PreferenceManager.getDefaultSharedPreferences(getContext()).edit()
+                .putString(PREF_SEARCH_HISTORY, jsonArray.toString()).commit();
+    }
+
+    private List<String> readHistoryList() {
+        try {
+            String unformatted = PreferenceManager.getDefaultSharedPreferences(getContext())
+                    .getString(PREF_SEARCH_HISTORY, "[]");
+            JSONArray jsonArray = new JSONArray(unformatted);
+            ArrayList<String> result = new ArrayList<String>();
+            for (int i = 0; i < jsonArray.length(); i++) {
+                result.add(jsonArray.getString(i));
+            }
+            return result;
+        } catch (JSONException e) {
+            return new ArrayList<String>();
+        }
+    }
+
+    /**
+     * Adds the current search text as top entry of the list.
+     */
+    private List<String> addCurrentTextToHistoryList(List<String> history) {
+        String text = mSearchText.getText().toString().trim();
+        if (TextUtils.isEmpty(text)) return history;
+
+        history.remove(text);
+        history.add(0, text);
+        if (history.size() > SEARCH_HISTORY_MAX_ENTRIES) {
+            history.remove(history.size() - 1);
+        }
+        return history;
+    }
+
+    // SearchHistoryDelegate implementation
+
+    @Override
+    public void saveSearchHistory() {
+        saveHistoryList((addCurrentTextToHistoryList(readHistoryList())));
+    }
+
+    // EnhancedBookmarkUIObserver implementation
+
+    @Override
+    public void onEnhancedBookmarkDelegateInitialized(EnhancedBookmarkDelegate delegate) {
+        mDelegate = delegate;
+        mDelegate.addUIObserver(this);
+        mEnhancedBookmarksModel = mDelegate.getModel();
+    }
+
+    @Override
+    public void onDestroy() {
+        mEnhancedBookmarksModel.removeObserver(mModelObserver);
+        mDelegate.removeUIObserver(this);
+    }
+
+    @Override
+    public void onAllBookmarksStateSet() {
+    }
+
+    @Override
+    public void onFolderStateSet(BookmarkId folder) {
+    }
+
+    @Override
+    public void onFilterStateSet(EnhancedBookmarkFilter filter) {
+    }
+
+    @Override
+    public void onSelectionStateChange(List<BookmarkId> selectedBookmarks) {
+    }
+
+    private class ResultListAdapter extends BaseAdapter {
+        private EnhancedBookmarkDelegate mDelegate;
+        private List<BookmarkMatch> mBookmarktList;
+
+        public ResultListAdapter(List<BookmarkMatch> bookmarkMatches,
+                EnhancedBookmarkDelegate delegate) {
+            mDelegate = delegate;
+            mBookmarktList = bookmarkMatches;
+        }
+
+        @Override
+        public int getCount() {
+            return mBookmarktList.size();
+        }
+
+        @Override
+        public BookmarkMatch getItem(int position) {
+            return mBookmarktList.get(position);
+        }
+
+        @Override
+        public long getItemId(int position) {
+            return position;
+        }
+
+        @Override
+        public View getView(int position, View convertView, ViewGroup parent) {
+            final BookmarkMatch bookmarkMatch = getItem(position);
+            if (convertView == null) {
+                convertView = LayoutInflater.from(parent.getContext()).inflate(
+                        R.layout.eb_search_row, parent, false);
+            }
+            final EnhancedBookmarkSearchRow row = (EnhancedBookmarkSearchRow) convertView;
+            row.onEnhancedBookmarkDelegateInitialized(mDelegate);
+            row.setBookmarkId(bookmarkMatch.getBookmarkId());
+            row.setSearchHistoryDelegate(EnhancedBookmarkSearchView.this);
+            return convertView;
+        }
+    }
+}