Upstream oodles of Chrome for Android code into Chromium.

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

+// 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.graphics.Bitmap;
+import android.graphics.Typeface;
+import android.graphics.drawable.Drawable;
+import android.text.Editable;
+import android.text.Layout;
+import android.text.SpannableString;
+import android.text.SpannableStringBuilder;
+import android.text.TextUtils;
+import android.text.TextUtils.TruncateAt;
+import android.text.TextWatcher;
+import android.text.style.StyleSpan;
+import android.util.AttributeSet;
+import android.util.Pair;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.ArrayAdapter;
+import android.widget.BaseAdapter;
+import android.widget.EditText;
+import android.widget.ImageButton;
+import android.widget.LinearLayout;
+import android.widget.ListView;
+import android.widget.TextView;
+import android.widget.ViewSwitcher;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.base.ApiCompatibilityUtils;
+import org.chromium.chrome.browser.BookmarksBridge.BookmarkItem;
+import org.chromium.chrome.browser.BookmarksBridge.BookmarkModelObserver;
+import org.chromium.chrome.browser.enhanced_bookmarks.EnhancedBookmarksBridge.FiltersObserver;
+import org.chromium.chrome.browser.enhanced_bookmarks.EnhancedBookmarksModel;
+import org.chromium.chrome.browser.enhanced_bookmarks.LaunchLocation;
+import org.chromium.chrome.browser.enhancedbookmarks.EnhancedBookmarkSalientImageView.SalientImageDrawableFactory;
+import org.chromium.chrome.browser.widget.CustomShapeDrawable.CircularDrawable;
+import org.chromium.components.bookmarks.BookmarkId;
+import org.chromium.components.bookmarks.BookmarkMatch;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * UI implementation for search in enhanced bookmark. Search results will be updated when user is
+ * typing. Before typing, a list of search history is shown.
+ */
+public class EnhancedBookmarkSearchView extends LinearLayout implements View.OnClickListener,
+        OnItemClickListener, FiltersObserver, EnhancedBookmarkUIObserver {
+
+    private static enum UIState {HISTORY, RESULT, EMPTY}
+    private static final int HISTORY_ITEM_PADDING_START_DP = 72;
+    private static final int MAXIMUM_NUMBER_OF_RESULTS = 500;
+    private static final String HORIZONTAL_ELLIPSIS = "\u2026";
+    private EnhancedBookmarksModel mEnhancedBookmarksModel;
+    private EnhancedBookmarkDelegate mDelegate;
+    private ImageButton mBackButton;
+    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) {
+                sendLocalSearchQuery();
+            }
+        }
+
+        @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) {
+                sendLocalSearchQuery();
+            }
+        }
+    };
+
+    /**
+     * Constructor for inflating from XML.
+     */
+    public EnhancedBookmarkSearchView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+        mBackButton = (ImageButton) findViewById(R.id.eb_search_back);
+        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);
+
+        mHistoryList.setOnItemClickListener(this);
+        mResultList.setOnItemClickListener(this);
+        mBackButton.setOnClickListener(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 {
+                    sendLocalSearchQuery();
+                }
+            }
+        });
+        mCurrentUIState = UIState.HISTORY;
+    }
+
+    @Override
+    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        if (parent == mHistoryList && view instanceof TextView) {
+            List<BookmarkId> bookmarkIds = mEnhancedBookmarksModel
+                    .getBookmarksForFilter((String) parent.getAdapter().getItem(position));
+            List<BookmarkMatch> bookmarkMatches = new ArrayList<BookmarkMatch>();
+            for (BookmarkId bookmarkId : bookmarkIds) {
+                bookmarkMatches.add(new BookmarkMatch(bookmarkId, null, null));
+            }
+            populateResultListView(bookmarkMatches);
+        } else if (parent == mResultList) {
+            mDelegate.openBookmark(
+                    ((BookmarkMatch) parent.getAdapter().getItem(position)).getBookmarkId(),
+                    LaunchLocation.SEARCH);
+            mDelegate.closeSearchUI();
+        }
+    }
+
+    private void resetUI() {
+        setUIState(UIState.HISTORY);
+        mResultList.setAdapter(null);
+        if (!mSearchText.getText().toString().isEmpty()) mSearchText.setText("");
+    }
+
+    private void sendLocalSearchQuery() {
+        String currentText = mSearchText.getText().toString().trim();
+        if (TextUtils.isEmpty(currentText)) return;
+
+        List<BookmarkMatch> results = mEnhancedBookmarksModel.getLocalSearchForQuery(currentText,
+                MAXIMUM_NUMBER_OF_RESULTS);
+        if (results != null) populateResultListView(results);
+    }
+
+    /**
+     * 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, mEnhancedBookmarksModel));
+        }
+    }
+
+    @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;
+        InputMethodManager imm = (InputMethodManager) getContext().getSystemService(
+                Context.INPUT_METHOD_SERVICE);
+        if (visibility != View.VISIBLE) {
+            imm.hideSoftInputFromWindow(mSearchText.getWindowToken(), 0);
+            mEnhancedBookmarksModel.removeFiltersObserver(this);
+            mEnhancedBookmarksModel.removeModelObserver(mModelObserver);
+            resetUI();
+            clearFocus();
+        } else {
+            mEnhancedBookmarksModel.addModelObserver(mModelObserver);
+            mEnhancedBookmarksModel.addFiltersObserver(this);
+            onFiltersChanged();
+            mSearchText.requestFocus();
+            imm.showSoftInput(mSearchText, 0);
+        }
+    }
+
+    private void setUIState(UIState state) {
+        if (mCurrentUIState == state) return;
+        mCurrentUIState = state;
+        if (state == UIState.HISTORY) {
+            mHistoryResultSwitcher.showHistory();
+        } else if (state == UIState.RESULT) {
+            mHistoryResultSwitcher.showResult();
+        } else if (state == UIState.EMPTY) {
+            mHistoryResultSwitcher.showEmpty();
+        }
+    }
+
+    @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)) {
+                    onClick(mBackButton);
+                    return true;
+                }
+            }
+        }
+
+        return super.dispatchKeyEvent(event);
+    }
+
+    /**
+     * Click listener for back button.
+     */
+    @Override
+    public void onClick(View v) {
+        assert v == mBackButton;
+        if (mCurrentUIState == UIState.HISTORY) {
+            mDelegate.closeSearchUI();
+        } else {
+            resetUI();
+        }
+    }
+
+    @Override
+    public void onFiltersChanged() {
+        // We use android default list and textviews for history. Only start padding is modified.
+        mHistoryList.setAdapter(new ArrayAdapter<String>(getContext(),
+                android.R.layout.simple_list_item_1, android.R.id.text1,
+                mEnhancedBookmarksModel.getFilters()) {
+            @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;
+            }
+        });
+    }
+
+    // EnhancedBookmarkUIObserver implementation
+
+    @Override
+    public void onEnhancedBookmarkDelegateInitialized(EnhancedBookmarkDelegate delegate) {
+        mDelegate = delegate;
+        mDelegate.addUIObserver(this);
+        mEnhancedBookmarksModel = mDelegate.getModel();
+    }
+
+    @Override
+    public void onDestroy() {
+        mEnhancedBookmarksModel.removeFiltersObserver(this);
+        mEnhancedBookmarksModel.removeModelObserver(mModelObserver);
+        mDelegate.removeUIObserver(this);
+    }
+
+    @Override
+    public void onAllBookmarksStateSet() {
+    }
+
+    @Override
+    public void onFolderStateSet(BookmarkId folder) {
+    }
+
+    @Override
+    public void onFilterStateSet(String filter) {
+    }
+
+    @Override
+    public void onSelectionStateChange(List<BookmarkId> selectedBookmarks) {
+    }
+
+    @Override
+    public void onListModeChange(boolean isListModeEnabled) {}
+
+    /**
+     * List Adapter that organizes search results.
+     */
+    private static class ResultListAdapter extends BaseAdapter implements
+            SalientImageDrawableFactory {
+
+        private EnhancedBookmarksModel mBookmarksModel;
+        private List<BookmarkMatch> mResultList;
+
+        public ResultListAdapter(List<BookmarkMatch> bookmarkMatches,
+                EnhancedBookmarksModel enhancedBookmarksModel) {
+            mBookmarksModel = enhancedBookmarksModel;
+            mResultList = bookmarkMatches;
+        }
+
+        @Override
+        public View getView(int position, View convertView, ViewGroup parent) {
+            final BookmarkMatch bookmarkMatch = getItem(position);
+            BookmarkItem bookmarkItem = mBookmarksModel.getBookmarkById(
+                    bookmarkMatch.getBookmarkId());
+            if (convertView == null) {
+                convertView = LayoutInflater.from(parent.getContext()).inflate(
+                        R.layout.eb_search_result_item, parent, false);
+            }
+            final TextView titleTextView = (TextView) convertView.findViewById(R.id.title);
+            final TextView urlTextView = (TextView) convertView.findViewById(R.id.url);
+            EnhancedBookmarkSalientImageView imageView = (EnhancedBookmarkSalientImageView)
+                    convertView.findViewById(R.id.round_image);
+            imageView.load(mBookmarksModel, bookmarkItem.getUrl(),
+                    EnhancedBookmarkUtils.generateBackgroundColor(bookmarkItem), this);
+
+            final SpannableString title = boldMatchPositions(bookmarkItem.getTitle(),
+                    bookmarkMatch.getTitleMatchPositions());
+            final SpannableString url = boldMatchPositions(bookmarkItem.getUrl(),
+                    bookmarkMatch.getUrlMatchPositions());
+
+            titleTextView.setText(title);
+            urlTextView.setText(url);
+
+            // Ensure the first matched search term is visible on the screen by calling
+            // moveCharactersOnScreen after the titleTextView.onLayout() has been executed
+            if (bookmarkMatch.getTitleMatchPositions() != null
+                    && bookmarkMatch.getTitleMatchPositions().size() > 0) {
+                titleTextView.addOnLayoutChangeListener(new OnLayoutChangeListener(){
+                    @Override
+                    public void onLayoutChange(View v, int left, int top, int right, int bottom,
+                            int oldLeft, int oldTop, int oldRight, int oldBottom) {
+                        moveCharactersOnScreen(titleTextView, title,
+                                bookmarkMatch.getTitleMatchPositions().get(0).first,
+                                bookmarkMatch.getTitleMatchPositions().get(0).second);
+                    }
+                });
+            }
+
+            // Ensure the first matched search term is visible on the screen by calling
+            // moveCharactersOnScreen after the urlTextView.onLayout() has been executed
+            if (bookmarkMatch.getUrlMatchPositions() != null
+                    && bookmarkMatch.getUrlMatchPositions().size() > 0) {
+                urlTextView.addOnLayoutChangeListener(new OnLayoutChangeListener(){
+                    @Override
+                    public void onLayoutChange(View v, int left, int top, int right, int bottom,
+                            int oldLeft, int oldTop, int oldRight, int oldBottom) {
+                        moveCharactersOnScreen(urlTextView, url,
+                                bookmarkMatch.getUrlMatchPositions().get(0).first,
+                                bookmarkMatch.getUrlMatchPositions().get(0).second);
+                    }
+                });
+            }
+
+            return convertView;
+        }
+
+        private SpannableString boldMatchPositions(String input,
+                List<Pair<Integer, Integer>> matches) {
+            SpannableString output = new SpannableString(input);
+            if (matches != null) {
+                for (Pair<Integer, Integer> match : matches) {
+                    StyleSpan boldSpan = new StyleSpan(Typeface.BOLD);
+                    output.setSpan(boldSpan, match.first, match.second, 0);
+                }
+            }
+
+            return output;
+        }
+
+        /**
+         * Ensures the characters from [charStartPos, charEndPos) are on screen.
+         *
+         * @param textView The textView to manipulate
+         * @param viewText A SpannableString containing the textView's text
+         * @param charStartPos The starting position for characters that should be on screen
+         * @param charEndPos The ending position for characters that should be on screen
+         */
+        private void moveCharactersOnScreen(TextView textView, SpannableString viewText,
+                int charStartPos, int charEndPos) {
+            if (textView.getLayout() == null) return;
+
+            if (!isCharacterOnScreen(textView.getLayout(), charEndPos - 1)) {
+                int subStringLength = textView.getLayout().getEllipsisStart(0);
+                int termLength = charEndPos - charStartPos;
+                int subStringStartPos = charStartPos - ((subStringLength - termLength) / 2);
+
+                if (subStringStartPos + subStringLength > viewText.length()) {
+                    // Characters are near the end of viewText, ellipsize the start
+                    textView.setEllipsize(TruncateAt.START);
+                } else {
+                    // Characters are somwhere in the middle of the viewText, change the textView's
+                    // text so the characters are on screen; both sides of the text will be
+                    // ellipsized
+                    SpannableStringBuilder newText = new SpannableStringBuilder(viewText,
+                            subStringStartPos, viewText.length());
+                    newText.insert(0, HORIZONTAL_ELLIPSIS);
+                    textView.setText(newText);
+                }
+            }
+        }
+
+        private boolean isCharacterOnScreen(Layout textViewLayout, int charPosition) {
+            int ellipsisPosition = textViewLayout.getEllipsisStart(0);
+            return ellipsisPosition == 0 || charPosition < ellipsisPosition;
+        }
+
+        @Override
+        public int getCount() {
+            return mResultList.size();
+        }
+
+        @Override
+        public BookmarkMatch getItem(int position) {
+            return mResultList.get(position);
+        }
+
+        @Override
+        public long getItemId(int position) {
+            return position;
+        }
+
+        // SalientImageDrawableFactory implementation
+
+        @Override
+        public Drawable getSalientDrawable(int color) {
+            return new CircularDrawable(color);
+        }
+
+        @Override
+        public Drawable getSalientDrawable(Bitmap bitmap) {
+            return new CircularDrawable(bitmap);
+        }
+    }
+
+    /**
+     * A custom {@link ViewSwitcher} that makes specific assumptions about the corresponding xml. It
+     * assumes it has two children: a {@link ListView} and a {@link ViewSwitcher}, and in the other
+     * {@link ViewSwitcher}, it contains a {@link TextView} and a {@link ListView}.
+     */
+    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 currently showing history, toggle.
+            if (getCurrentView().getId() == R.id.eb_history_list) showNext();
+            // If currently showing empty view, toggle.
+            if (mResultEmptySwitcher.getCurrentView().getId() == R.id.eb_search_empty_view) {
+                mResultEmptySwitcher.showNext();
+            }
+        }
+
+        void showEmpty() {
+            // If currently showing history, toggle.
+            if (getCurrentView().getId() == R.id.eb_history_list) showNext();
+            // If currently showing result list, toggle.
+            if (mResultEmptySwitcher.getCurrentView().getId() == R.id.eb_result_list) {
+                mResultEmptySwitcher.showNext();
+            }
+        }
+    }
+
+
+}