Make the Translate Overflow Menu using ListPopupWindow

chrome/android/java/src/org/chromium/chrome/browser/infobar/translate/TranslateMenuSpinnerHelper.java

Index: chrome/android/java/src/org/chromium/chrome/browser/infobar/translate/TranslateMenuSpinnerHelper.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/infobar/translate/TranslateMenuSpinnerHelper.java b/chrome/android/java/src/org/chromium/chrome/browser/infobar/translate/TranslateMenuSpinnerHelper.java
new file mode 100644
index 0000000000000000000000000000000000000000..c828b61226f05fb502cb1f3526e7d75566e20be4
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/infobar/translate/TranslateMenuSpinnerHelper.java
@@ -0,0 +1,144 @@
+// Copyright 2017 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.infobar.translate;
+
+import android.content.Context;
+import android.view.ContextThemeWrapper;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.Spinner;
+import android.widget.TextView;
+
+import org.chromium.chrome.R;
+
+import java.util.List;
+
+/**
+ * A Helper class for managing the Translate Overflow Menu.
+ */
+public class TranslateMenuSpinnerHelper implements AdapterView.OnItemSelectedListener {
+    // A dummy element, selecting it means "select none".
+    private static final int POSITION_NONE = 0;
+
+    private Spinner mSpinner;
+    private final TranslateSpinnerItemListener mItemListener;
+
+    /**
+     * Interface for receiving the click event of spinner item.
+     */
+    public interface TranslateSpinnerItemListener { void onSpinnerItemSelected(String id); }
+
+    public TranslateMenuSpinnerHelper(Context context, Spinner spinner,
+            List<TranslateSpinnerElement> list, TranslateSpinnerItemListener itemListener) {
+        mItemListener = itemListener;
+        mSpinner = spinner;
+
+        // Added a dummy (for "select none") element as the first element of the list.
+        list.add(POSITION_NONE, new TranslateSpinnerElement("", null));
+
+        ContextThemeWrapper wrapper = new ContextThemeWrapper(context, R.style.OverflowMenuTheme);
+
+        TranslateMenuSpinnerAdapter translateMenuSpinnerAdapter = new TranslateMenuSpinnerAdapter(
+                context, android.R.layout.simple_spinner_item, list, LayoutInflater.from(wrapper));
+        translateMenuSpinnerAdapter.setDropDownViewResource(
+                android.R.layout.simple_spinner_dropdown_item);
+        int popupWidth = context.getResources().getDimensionPixelSize(R.dimen.menu_width);
+        mSpinner.setOnItemSelectedListener(this);
+        mSpinner.setDropDownWidth(popupWidth);
+        mSpinner.setAdapter(translateMenuSpinnerAdapter);
+    }
+
+    @Override
+    public void onItemSelected(AdapterView<?> adapter, View view, int position, long id) {
+        if (position == POSITION_NONE) {
+            return;
+        }
+        String code = ((TranslateSpinnerElement) mSpinner.getSelectedItem()).getId();
+        mItemListener.onSpinnerItemSelected(code);
+
+        // Reset selection.  this way the spinner will scroll back to the top when it reopens.
+        mSpinner.setSelection(POSITION_NONE);
+    }
+
+    @Override
+    public void onNothingSelected(AdapterView<?> adapter) {}
+
+    /**
+     * The provides the views of the spinner, spinner items and dividers.
+     */
+    public class TranslateMenuSpinnerAdapter extends ArrayAdapter<TranslateSpinnerElement> {
+        LayoutInflater mInflater;
+
+        public TranslateMenuSpinnerAdapter(Context context, int textViewResourceId,
+                List<TranslateSpinnerElement> items, LayoutInflater inflater) {
+            super(context, textViewResourceId, items);
+            mInflater = inflater;
+        }
+
+        @Override
+        public boolean isEnabled(int position) {
+            return (position != POSITION_NONE
+                    && !((TranslateSpinnerElement) mSpinner.getItemAtPosition(position))
+                                .isDividerLine());
+        }
+
+        @Override
+        public View getView(int position, View convertView, ViewGroup parent) {
+            convertView = new View(getContext());
+            convertView.setVisibility(View.GONE);
+            return convertView;
+        }
+
+        @Override
+        public View getDropDownView(int position, View convertView, ViewGroup parent) {
+            TranslateSpinnerElement item =
+                    ((TranslateSpinnerElement) mSpinner.getItemAtPosition(position));
+            if (position == POSITION_NONE) {
+                convertView = new View(getContext());
+                convertView.setVisibility(View.GONE);
+            } else if (item.isDividerLine()) {
+                convertView =
+                        mInflater.inflate(R.layout.translate_menu_spinner_divider, parent, false);
+            } else {
+                convertView =
+                        mInflater.inflate(R.layout.translate_menu_spinner_item, parent, false);
+                ((TextView) convertView.findViewById(R.id.menu_item_text)).setText(item.toString());
+            }
+            return convertView;
+        }
+    }
+
+    /**
+     * The element that goes inside the spinner.
+     */
+    public static class TranslateSpinnerElement {
+        private final String mTitle;
+        private final String mId;
+
+        public TranslateSpinnerElement(String title, String id) {
+            mTitle = title;
+            mId = id;
+        }
+
+        public String getId() {
+            return mId;
+        }
+
+        public boolean isDividerLine() {
+            return mId == null;
+        }
+
+        /**
+         * This is the text displayed in the spinner element.
+         */
+        @Override
+        public String toString() {
+            return mTitle;
+        }
+    }
+}