[ChromeShell] Add suggestions for ChromeShell toolbar box.

chrome/android/shell/java/src/org/chromium/chrome/shell/omnibox/SuggestionPopup.java

Index: chrome/android/shell/java/src/org/chromium/chrome/shell/omnibox/SuggestionPopup.java
diff --git a/chrome/android/shell/java/src/org/chromium/chrome/shell/omnibox/SuggestionPopup.java b/chrome/android/shell/java/src/org/chromium/chrome/shell/omnibox/SuggestionPopup.java
new file mode 100644
index 0000000000000000000000000000000000000000..184af651eb1e236b9bcfb2c0ca39027edec87abb
--- /dev/null
+++ b/chrome/android/shell/java/src/org/chromium/chrome/shell/omnibox/SuggestionPopup.java
@@ -0,0 +1,150 @@
+// Copyright 2014 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.shell.omnibox;
+
+import android.content.Context;
+import android.os.Handler;
+import android.text.Editable;
+import android.text.TextUtils;
+import android.text.TextWatcher;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.ListPopupWindow;
+import android.widget.PopupWindow.OnDismissListener;
+import android.widget.TextView;
+
+import org.chromium.chrome.browser.omnibox.AutocompleteController;
+import org.chromium.chrome.browser.omnibox.AutocompleteController.OnSuggestionsReceivedListener;
+import org.chromium.chrome.browser.omnibox.OmniboxSuggestion;
+import org.chromium.chrome.shell.ChromeShellToolbar;
+import org.chromium.chrome.shell.R;
+
+import java.util.List;
+
+/**
+ * Displays suggestions for the text that is entered to the ChromeShell URL field.
+ */
+public class SuggestionPopup implements OnSuggestionsReceivedListener, TextWatcher {
+    private static final long SUGGESTION_START_DELAY_MS = 30;
+
+    private final Context mContext;
+    private final TextView mUrlField;
+    private final ChromeShellToolbar mToolbar;
+    private final AutocompleteController mAutocomplete;
+
+    private boolean mHasStartedNewOmniboxEditSession;
+    private Runnable mRequestSuggestions;
+    private ListPopupWindow mSuggestionsPopup;
+    private SuggestionArrayAdapter mSuggestionArrayAdapter;
+
+    /**
+     * Initializes a suggestion popup that will track urlField value and display suggestions based
+     * on that value.
+     */
+    public SuggestionPopup(Context context, TextView urlField,
+            ChromeShellToolbar toolbar) {
+        mContext = context;
+        mUrlField = urlField;
+        mToolbar = toolbar;
+        mAutocomplete = new AutocompleteController(this);
+    }
+
+    private void navigateToSuggestion(int position) {
+        mToolbar.getCurrentTab().loadUrlWithSanitization(
+                mSuggestionArrayAdapter.getItem(position).getUrl());
+        mUrlField.clearFocus();
+        mToolbar.setKeyboardVisibilityForUrl(false);
+        mToolbar.getCurrentTab().getView().requestFocus();
+        dismissPopup();
+    }
+
+    private void dismissPopup() {
+        if (mSuggestionsPopup != null) {
+            mSuggestionsPopup.dismiss();
+            mSuggestionsPopup = null;
+        }
+    }
+
+    /**
+     * Signals the autocomplete controller to stop generating suggestions and
+     * cancels the queued task to start the autocomplete controller, if any.
+     *
+     * @param clear Whether to clear the most recent autocomplete results.
+     */
+    private void stopAutocomplete(boolean clear) {
+        if (mAutocomplete != null) mAutocomplete.stop(clear);
+        if (mRequestSuggestions != null) mRequestSuggestions = null;
+    }
+
+    // OnSuggestionsReceivedListener implementation
+
+    @Override
+    public void onSuggestionsReceived(List<OmniboxSuggestion> suggestions,
+            String inlineAutocompleteText) {
+        if (!mUrlField.isFocused() || suggestions.isEmpty())
+            return;
+        if (mSuggestionsPopup == null) {
+            mSuggestionsPopup = new ListPopupWindow(
+                    mContext, null, android.R.attr.autoCompleteTextViewStyle);
+            mSuggestionsPopup.setOnDismissListener(new OnDismissListener() {
+                @Override
+                public void onDismiss() {
+                    mHasStartedNewOmniboxEditSession = false;
+                    mSuggestionArrayAdapter = null;
+                }
+            });
+        }
+        mSuggestionsPopup.setWidth(mUrlField.getWidth());
+        mSuggestionArrayAdapter =
+                new SuggestionArrayAdapter(mContext, R.layout.dropdown_item, suggestions);
+        mSuggestionsPopup.setAdapter(mSuggestionArrayAdapter);
+        mSuggestionsPopup.setAnchorView(mUrlField);
+        mSuggestionsPopup.setOnItemClickListener(new OnItemClickListener() {
+            @Override
+            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+                navigateToSuggestion(position);
+            }
+        });
+        mSuggestionsPopup.show();
+    }
+
+    // TextWatcher implementation
+
+    @Override
+    public void afterTextChanged(final Editable editableText) {
+        if (!mHasStartedNewOmniboxEditSession) {
+            mAutocomplete.resetSession();
+            mHasStartedNewOmniboxEditSession = true;
+        }
+
+        stopAutocomplete(false);
+        if (TextUtils.isEmpty(editableText)) {
+            dismissPopup();
+        } else {
+            assert mRequestSuggestions == null : "Multiple omnibox requests in flight.";
+            mRequestSuggestions = new Runnable() {
+                @Override
+                public void run() {
+                    mRequestSuggestions = null;
+                    mAutocomplete.start(
+                            mToolbar.getCurrentTab().getProfile(),
+                            mToolbar.getCurrentTab().getUrl(),
+                            editableText.toString(), false);
+                }
+            };
+            new Handler().postDelayed(mRequestSuggestions, SUGGESTION_START_DELAY_MS);
+        }
+    }
+
+    @Override
+    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+        mRequestSuggestions = null;
+    }
+
+    @Override
+    public void onTextChanged(CharSequence s, int start, int before, int count) {
+    }
+}