Android - Introduce "keyboard accessory" for Autofill suggestions.

ui/android/java/src/org/chromium/ui/autofill/AutofillKeyboardAccessory.java

Index: ui/android/java/src/org/chromium/ui/autofill/AutofillKeyboardAccessory.java
diff --git a/ui/android/java/src/org/chromium/ui/autofill/AutofillKeyboardAccessory.java b/ui/android/java/src/org/chromium/ui/autofill/AutofillKeyboardAccessory.java
new file mode 100644
index 0000000000000000000000000000000000000000..d114ccd1d14fc9982b25138957755ca60cf33741
--- /dev/null
+++ b/ui/android/java/src/org/chromium/ui/autofill/AutofillKeyboardAccessory.java
@@ -0,0 +1,117 @@
+// 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.ui.autofill;
+
+import android.annotation.SuppressLint;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.accessibility.AccessibilityEvent;
+import android.widget.AdapterView;
+import android.widget.ListAdapter;
+import android.widget.ListView;
+
+import org.chromium.base.ApiCompatibilityUtils;
+import org.chromium.base.annotations.SuppressFBWarnings;
+import org.chromium.ui.DropdownAdapter;
+import org.chromium.ui.R;
+import org.chromium.ui.base.WindowAndroid;
+
+import java.util.HashSet;
+
+/**
+ * The Autofill suggestion view that lists relevant suggestions. It sits above the keyboard and
+ * below the content area.
+ */
+public class AutofillKeyboardAccessory extends ListView implements AdapterView.OnItemClickListener {
+    private final WindowAndroid mWindowAndroid;
+    private final AutofillKeyboardAccessoryDelegate mAutofillCallback;
+
+    /**
+     * An interface to handle the touch interaction with an AutofillKeyboardAccessory object.
+     */
+    public interface AutofillKeyboardAccessoryDelegate {
+        /**
+         * Informs the controller the AutofillKeyboardAccessory was hidden.
+         */
+        public void dismissed();
+
+        /**
+         * Handles the selection of an Autofill suggestion from an AutofillKeyboardAccessory.
+         * @param listIndex The index of the selected Autofill suggestion.
+         */
+        public void suggestionSelected(int listIndex);
+    }
+
+    /**
+     * Creates an AutofillKeyboardAccessory with specified parameters.
+     * @param windowAndroid The owning WindowAndroid.
+     * @param autofillCallback A object that handles the calls to the native
+     * AutofillKeyboardAccessoryView.
+     */
+    @SuppressFBWarnings("NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE")
+    public AutofillKeyboardAccessory(
+            WindowAndroid windowAndroid, AutofillKeyboardAccessoryDelegate autofillCallback) {
+        super(windowAndroid.getActivity().get());
+        assert autofillCallback != null;
+        assert windowAndroid.getActivity().get() != null;
+        mWindowAndroid = windowAndroid;
+        mAutofillCallback = autofillCallback;
+
+        setBackgroundResource(R.drawable.autofill_accessory_view_border);
+        setOnItemClickListener(this);
+        setContentDescription(windowAndroid.getActivity().get().getString(
+                R.string.autofill_popup_content_description));
+    }
+
+    /**
+     * Shows the given suggestions.
+     * @param suggestions Autofill suggestion data.
+     * @param isRtl Gives the layout direction for the <input> field.
+     */
+    @SuppressLint("InlinedApi")
+    public void showWithSuggestions(AutofillSuggestion[] suggestions, boolean isRtl) {
+        setAdapter(new DropdownAdapter(
+                mWindowAndroid.getActivity().get(), suggestions, new HashSet<Integer>()));
+        ApiCompatibilityUtils.setLayoutDirection(
+                this, isRtl ? View.LAYOUT_DIRECTION_RTL : View.LAYOUT_DIRECTION_LTR);
+
+        int height = ViewGroup.LayoutParams.WRAP_CONTENT;
+        // Limit the visible number of suggestions (others are accessible via scrolling).
+        final int suggestionLimit = 2;
+        ListAdapter listAdapter = getAdapter();
+        if (listAdapter.getCount() > suggestionLimit) {
+            height = 0;
+            for (int i = 0; i < suggestionLimit; i++) {
+                View listItem = listAdapter.getView(i, null, this);
+                listItem.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
+                        MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
+                height += listItem.getMeasuredHeight();
+            }
+        }
+
+        setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, height));
+
+        if (getParent() == null) {
+            ViewGroup container = mWindowAndroid.getKeyboardAccessoryView();
+            container.addView(this);
+            container.setVisibility(View.VISIBLE);
+            sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
+        }
+    }
+
+    /**
+     * Called to hide the suggestion view.
+     */
+    public void dismiss() {
+        ViewGroup container = mWindowAndroid.getKeyboardAccessoryView();
+        container.removeView(this);
+        container.setVisibility(View.GONE);
+    }
+
+    @Override
+    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        mAutofillCallback.suggestionSelected(position);
+    }
+}