Add support for Android spellcheck menu in Chrome/WebViews

content/public/android/java/src/org/chromium/content/browser/input/SuggestionsPopupWindow.java

Index: content/public/android/java/src/org/chromium/content/browser/input/SuggestionsPopupWindow.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/input/SuggestionsPopupWindow.java b/content/public/android/java/src/org/chromium/content/browser/input/SuggestionsPopupWindow.java
new file mode 100644
index 0000000000000000000000000000000000000000..96626ef1c4e9c68b502b9deb596911d9f8e08882
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content/browser/input/SuggestionsPopupWindow.java
@@ -0,0 +1,271 @@
+// 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.content.browser.input;
+
+import android.content.Context;
+import android.content.Intent;
+import android.graphics.Color;
+import android.graphics.Rect;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
+import android.util.DisplayMetrics;
+import android.view.Gravity;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.BaseAdapter;
+import android.widget.LinearLayout;
+import android.widget.ListView;
+import android.widget.PopupWindow;
+import android.widget.PopupWindow.OnDismissListener;
+import android.widget.TextView;
+
+import org.chromium.content.R;
+
+/**
+ * Popup window that displays a menu for viewing and applying text replacement
+ * suggestions.
+ */
+
+public class SuggestionsPopupWindow implements OnItemClickListener, OnDismissListener {
+    private static final String ACTION_USER_DICTIONARY_INSERT =
+            "com.android.settings.USER_DICTIONARY_INSERT";
+    private static final String USER_DICTIONARY_EXTRA_WORD = "word";
+
+    private final Context mContext;
+    private final TextSuggestionHost mTextSuggestionHost;
+    private final View mAttachedView;
+
+    private PopupWindow mPopupWindow;
+    private ViewGroup mContentView;
+    private int mClippingLimitLeft;
+    private int mClippingLimitRight;
+    private Rect mTempRect;
+
+    private SuggestionAdapter mSuggestionsAdapter;
+    private String mHighlightedText;
+    private String[] mSpellCheckSuggestions = new String[0];
+    private TextView mDeleteButton;
+    private TextView mAddToDictionaryButton;
+    private ListView mSuggestionListView;
+    private int mContainerMarginWidth;
+    private int mContainerMarginTop;
+    private LinearLayout mContainerView;
+
+    private boolean mDismissedByItemTap;
+
+    public SuggestionsPopupWindow(
+            Context context, TextSuggestionHost textSuggestionHost, View attachedView) {
+        mContext = context;
+        mTextSuggestionHost = textSuggestionHost;
+        mAttachedView = attachedView;
+
+        createPopupWindow();
+
+        mPopupWindow.setWidth(ViewGroup.LayoutParams.WRAP_CONTENT);
+        mPopupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
+
+        initContentView();
+
+        ViewGroup.LayoutParams wrapContent = new ViewGroup.LayoutParams(
+                ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
+        mContentView.setLayoutParams(wrapContent);
+        mPopupWindow.setContentView(mContentView);
+    }
+
+    private void createPopupWindow() {
+        mPopupWindow = new PopupWindow();
+        mPopupWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
+        mPopupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
+
+        mPopupWindow.setFocusable(true);
+        mPopupWindow.setClippingEnabled(false);
+
+        mPopupWindow.setOnDismissListener(this);
+    }
+
+    private void initContentView() {
+        final LayoutInflater inflater =
+                (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+        mContentView = (ViewGroup) inflater.inflate(R.layout.text_edit_suggestion_container, null);
+        mContainerView = (LinearLayout) mContentView.findViewById(R.id.suggestionWindowContainer);
+        ViewGroup.MarginLayoutParams lp =
+                (ViewGroup.MarginLayoutParams) mContainerView.getLayoutParams();
+        mContainerMarginWidth = lp.leftMargin + lp.rightMargin;
+        mContainerMarginTop = lp.topMargin;
+        mClippingLimitLeft = lp.leftMargin;
+        mClippingLimitRight = lp.rightMargin;
+
+        mSuggestionListView = (ListView) mContentView.findViewById(R.id.suggestionContainer);
+        // android:divider="@null" in the XML file crashes on Android N and O
+        // when running as a WebView (b/38346876)
+        mSuggestionListView.setDivider(null);
+
+        mSuggestionsAdapter = new SuggestionAdapter();
+        mSuggestionListView.setAdapter(mSuggestionsAdapter);
+        mSuggestionListView.setOnItemClickListener(this);
+
+        mDeleteButton = (TextView) mContentView.findViewById(R.id.deleteButton);
+        mDeleteButton.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+                mTextSuggestionHost.deleteActiveSuggestionRange();
+                mDismissedByItemTap = true;
+                mPopupWindow.dismiss();
+            }
+        });
+
+        mAddToDictionaryButton = (TextView) mContentView.findViewById(R.id.addToDictionaryButton);
+        mAddToDictionaryButton.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+                addToDictionary();
+                mTextSuggestionHost.newWordAddedToDictionary(mHighlightedText);
+                mDismissedByItemTap = true;
+                mPopupWindow.dismiss();
+            }
+        });
+    }
+
+    public void dismiss() {
+        mPopupWindow.dismiss();
+    }
+
+    public boolean isShowing() {
+        return mPopupWindow.isShowing();
+    }
+
+    private void addToDictionary() {
+        final Intent intent = new Intent(ACTION_USER_DICTIONARY_INSERT);
+        intent.putExtra(USER_DICTIONARY_EXTRA_WORD, mHighlightedText);
+        intent.setFlags(intent.getFlags() | Intent.FLAG_ACTIVITY_NEW_TASK);
+        mContext.startActivity(intent);
+    }
+
+    private class SuggestionAdapter extends BaseAdapter {
+        private LayoutInflater mInflater =
+                (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+
+        @Override
+        public int getCount() {
+            return mSpellCheckSuggestions.length;
+        }
+
+        @Override
+        public Object getItem(int position) {
+            return mSpellCheckSuggestions[position];
+        }
+
+        @Override
+        public long getItemId(int position) {
+            return position;
+        }
+
+        @Override
+        public View getView(int position, View convertView, ViewGroup parent) {
+            TextView textView = (TextView) convertView;
+            if (textView == null) {
+                textView = (TextView) mInflater.inflate(
+                        R.layout.text_edit_suggestion_item, parent, false);
+            }
+            final String suggestion = mSpellCheckSuggestions[position];
+            textView.setText(suggestion);
+            return textView;
+        }
+    }
+
+    private void measureContent() {
+        final DisplayMetrics displayMetrics = mContext.getResources().getDisplayMetrics();
+        final int horizontalMeasure = View.MeasureSpec.makeMeasureSpec(
+                displayMetrics.widthPixels, View.MeasureSpec.AT_MOST);
+        final int verticalMeasure = View.MeasureSpec.makeMeasureSpec(
+                displayMetrics.heightPixels, View.MeasureSpec.AT_MOST);
+        int width = 0;
+        View view = null;
+        for (int i = 0; i < mSpellCheckSuggestions.length; i++) {
+            view = mSuggestionsAdapter.getView(i, view, mContentView);
+            view.getLayoutParams().width = ViewGroup.LayoutParams.WRAP_CONTENT;
+            view.measure(horizontalMeasure, verticalMeasure);
+            width = Math.max(width, view.getMeasuredWidth());
+        }
+        mDeleteButton.measure(horizontalMeasure, verticalMeasure);
+        width = Math.max(width, mDeleteButton.getMeasuredWidth());
+        mAddToDictionaryButton.measure(horizontalMeasure, verticalMeasure);
+        width = Math.max(width, mAddToDictionaryButton.getMeasuredWidth());
+        width += mContainerView.getPaddingLeft() + mContainerView.getPaddingRight()
+                + mContainerMarginWidth;
+        // Enforce the width based on actual text widths
+        mContentView.measure(
+                View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY), verticalMeasure);
+        Drawable popupBackground = mPopupWindow.getBackground();
+        if (popupBackground != null) {
+            if (mTempRect == null) mTempRect = new Rect();
+            popupBackground.getPadding(mTempRect);
+            width += mTempRect.left + mTempRect.right;
+        }
+        mPopupWindow.setWidth(width);
+    }
+
+    public void setHighlightedText(String text) {
+        mHighlightedText = text;
+    }
+
+    public void setSpellCheckSuggestions(String[] suggestions) {
+        mSpellCheckSuggestions = suggestions.clone();
+    }
+
+    public void show(double caretX, double caretY) {
+        mSuggestionsAdapter.notifyDataSetChanged();
+        // We get the insertion point coords relative to the WebView bounds.
+        // We need to render the popup relative to the display
+        int[] locationOnScreen = new int[2];
+        mAttachedView.getLocationOnScreen(locationOnScreen);
+
+        final DisplayMetrics displayMetrics = mContext.getResources().getDisplayMetrics();
+
+        measureContent();
+        int width = mContentView.getMeasuredWidth();
+
+        int positionX = (int) Math.round(caretX - width / 2.0f);
+        int positionY = (int) Math.round(caretY);
+
+        final int[] positionInWindow = new int[2];
+        mAttachedView.getLocationInWindow(positionInWindow);
+
+        positionX += positionInWindow[0];
+        positionY += positionInWindow[1];
+
+        positionY -= mContainerMarginTop;
+
+        // horizontal clipping
+        width = mContentView.getMeasuredWidth();
+        positionX = Math.min(displayMetrics.widthPixels - width + mClippingLimitRight, positionX);
+        positionX = Math.max(-mClippingLimitLeft, positionX);
+
+        // vertical clipping
+        final int height = mContentView.getMeasuredHeight();
+        positionY = Math.min(positionY, displayMetrics.heightPixels - height);
+
+        if (isShowing()) {
+            mPopupWindow.update(positionX, positionY, -1, -1);
+        } else {
+            mPopupWindow.showAtLocation(mAttachedView, Gravity.NO_GRAVITY, positionX, positionY);
+        }
+    }
+
+    @Override
+    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        String suggestion = mSpellCheckSuggestions[position];
+        mTextSuggestionHost.applySpellCheckSuggestion(suggestion);
+        mDismissedByItemTap = true;
+        mPopupWindow.dismiss();
+    }
+
+    @Override
+    public void onDismiss() {
+        mTextSuggestionHost.suggestionMenuClosed(mDismissedByItemTap);
+        mDismissedByItemTap = false;
+    }
+}