Add class to make text views with clickable spans accessible.

ui/android/java/src/org/chromium/ui/widget/TextViewWithClickableSpans.java

Index: ui/android/java/src/org/chromium/ui/widget/TextViewWithClickableSpans.java
diff --git a/ui/android/java/src/org/chromium/ui/widget/TextViewWithClickableSpans.java b/ui/android/java/src/org/chromium/ui/widget/TextViewWithClickableSpans.java
new file mode 100644
index 0000000000000000000000000000000000000000..64488043f2760ad1e5fcb47a900edcd8f20dfa91
--- /dev/null
+++ b/ui/android/java/src/org/chromium/ui/widget/TextViewWithClickableSpans.java
@@ -0,0 +1,98 @@
+// 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.ui.widget;
+
+import android.content.Context;
+import android.text.SpannableString;
+import android.text.style.ClickableSpan;
+import android.util.AttributeSet;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.PopupMenu;
+import android.widget.TextView;
+
+/**
+ * ClickableSpan isn't accessible by default, so we create a simple subclass
+ * of TextView that addresses this by adding click and longpress handlers.
+ * If there's only one ClickableSpan, we activate it. If there's more than
+ * one, we pop up a Spinner to disambiguate.
+ */
+public class TextViewWithClickableSpans extends TextView {
+    public TextViewWithClickableSpans(Context context) {
+        super(context);
+        init();
+    }
+
+    public TextViewWithClickableSpans(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+
+    public TextViewWithClickableSpans(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init();
+    }
+
+    private void init() {
+        setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                handleClick();
+            }
+        });
+        setOnLongClickListener(new View.OnLongClickListener() {
+            @Override
+            public boolean onLongClick(View v) {
+                openDisambiguationMenu();
+                return true;
+            }
+        });
+    }
+
+    private ClickableSpan[] getClickableSpans() {
+        CharSequence text = getText();
+        if (!(text instanceof SpannableString)) return null;
+
+        SpannableString spannable = (SpannableString) text;
+        return spannable.getSpans(0, spannable.length(), ClickableSpan.class);
+    }
+
+    private void handleClick() {
+        ClickableSpan[] clickableSpans = getClickableSpans();
+        if (clickableSpans == null || clickableSpans.length == 0) {
+            return;
+        } else if (clickableSpans.length == 1) {
+            clickableSpans[0].onClick(this);
+        } else {
+            openDisambiguationMenu();
+        }
+    }
+
+    private void openDisambiguationMenu() {
+        ClickableSpan[] clickableSpans = getClickableSpans();
+        if (clickableSpans == null || clickableSpans.length == 0)
+            return;
+
+        SpannableString spannable = (SpannableString) getText();
+        PopupMenu popup = new PopupMenu(getContext(), this);
+        Menu menu = popup.getMenu();
+        for (final ClickableSpan clickableSpan : clickableSpans) {
+            CharSequence itemText = spannable.subSequence(
+                    spannable.getSpanStart(clickableSpan),
+                    spannable.getSpanEnd(clickableSpan));
+            MenuItem menuItem = menu.add(itemText);
+            menuItem.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
+                @Override
+                public boolean onMenuItemClick(MenuItem menuItem) {
+                    clickableSpan.onClick(TextViewWithClickableSpans.this);
+                    return true;
+                }
+            });
+        }
+
+        popup.show();
+    }
+}