Implement the autofill UI for chromium powered android webview.

chrome/android/java/src/org/chromium/chrome/browser/autofill/AutofillPopup.java

-// Copyright (c) 2012 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.autofill;
-
-import android.content.Context;
-import android.graphics.Paint;
-import android.graphics.Rect;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.View.OnLayoutChangeListener;
-import android.widget.AdapterView;
-import android.widget.ListPopupWindow;
-import android.widget.TextView;
-
-import java.util.ArrayList;
-
-import org.chromium.chrome.R;
-import org.chromium.ui.ViewAndroidDelegate;
-
-/**
- * The Autofill suggestion popup that lists relevant suggestions.
- */
-public class AutofillPopup extends ListPopupWindow implements AdapterView.OnItemClickListener {
-
-    /**
-     * Constants defining types of Autofill suggestion entries.
-     * Has to be kept in sync with enum in WebAutofillClient.h
-     *
-     * Not supported: MenuItemIDWarningMessage, MenuItemIDSeparator, MenuItemIDClearForm, and
-     * MenuItemIDAutofillOptions.
-     */
-    private static final int ITEM_ID_AUTOCOMPLETE_ENTRY = 0;
-    private static final int ITEM_ID_PASSWORD_ENTRY = -2;
-    private static final int ITEM_ID_DATA_LIST_ENTRY = -6;
-
-    private static final int TEXT_PADDING_DP = 40;
-
-    private final AutofillPopupDelegate mAutofillCallback;
-    private final Context mContext;
-    private final ViewAndroidDelegate mViewAndroidDelegate;
-    private View mAnchorView;
-    private float mAnchorWidth;
-    private float mAnchorHeight;
-    private float mAnchorX;
-    private float mAnchorY;
-    private Paint mNameViewPaint;
-    private Paint mLabelViewPaint;
-    private OnLayoutChangeListener mLayoutChangeListener;
-
-    /**
-     * An interface to handle the touch interaction with an AutofillPopup object.
-     */
-    public interface AutofillPopupDelegate {
-        /**
-         * Requests the controller to hide AutofillPopup.
-         */
-        public void requestHide();
-
-        /**
-         * Handles the selection of an Autofill suggestion from an AutofillPopup.
-         * @param listIndex The index of the selected Autofill suggestion.
-         */
-        public void suggestionSelected(int listIndex);
-    }
-
-    /**
-     * Creates an AutofillWindow with specified parameters.
-     * @param context Application context.
-     * @param viewAndroidDelegate View delegate used to add and remove views.
-     * @param autofillCallback A object that handles the calls to the native AutofillPopupView.
-     */
-    public AutofillPopup(Context context, ViewAndroidDelegate viewAndroidDelegate,
-            AutofillPopupDelegate autofillCallback) {
-        super(context);
-        mContext = context;
-        mViewAndroidDelegate = viewAndroidDelegate ;
-        mAutofillCallback = autofillCallback;
-
-        setOnItemClickListener(this);
-
-        mAnchorView = mViewAndroidDelegate.acquireAnchorView();
-        mViewAndroidDelegate.setAnchorViewPosition(mAnchorView, mAnchorX, mAnchorY, mAnchorWidth,
-                mAnchorHeight);
-
-        mLayoutChangeListener = new OnLayoutChangeListener() {
-            @Override
-            public void onLayoutChange(View v, int left, int top, int right, int bottom,
-                    int oldLeft, int oldTop, int oldRight, int oldBottom) {
-                if (v == mAnchorView) AutofillPopup.this.show();
-            }
-        };
-
-        mAnchorView.addOnLayoutChangeListener(mLayoutChangeListener);
-        setAnchorView(mAnchorView);
-    }
-
-    /**
-     * Sets the location and the size of the anchor view that the AutofillPopup will use to attach
-     * itself.
-     * @param x X coordinate of the top left corner of the anchor view.
-     * @param y Y coordinate of the top left corner of the anchor view.
-     * @param width The width of the anchor view.
-     * @param height The height of the anchor view.
-     */
-    public void setAnchorRect(float x, float y, float width, float height) {
-        mAnchorWidth = width;
-        mAnchorHeight = height;
-        mAnchorX = x;
-        mAnchorY = y;
-        if (mAnchorView != null) {
-            mViewAndroidDelegate.setAnchorViewPosition(mAnchorView, mAnchorX, mAnchorY,
-                    mAnchorWidth, mAnchorHeight);
-        }
-    }
-
-    /**
-     * Sets the Autofill suggestions to display in the popup and shows the popup.
-     * @param suggestions Autofill suggestion data.
-     */
-    public void show(AutofillSuggestion[] suggestions) {
-        // Remove the AutofillSuggestions with IDs that are not supported by Android
-        ArrayList<AutofillSuggestion> cleanedData = new ArrayList<AutofillSuggestion>();
-        for (int i = 0; i < suggestions.length; i++) {
-            int itemId = suggestions[i].mUniqueId;
-            if (itemId > 0 || itemId == ITEM_ID_AUTOCOMPLETE_ENTRY ||
-                    itemId == ITEM_ID_PASSWORD_ENTRY || itemId == ITEM_ID_DATA_LIST_ENTRY) {
-                cleanedData.add(suggestions[i]);
-            }
-        }
-        setAdapter(new AutofillListAdapter(mContext, cleanedData));
-        // Once the mAnchorRect is resized and placed correctly, it will show the Autofill popup.
-        mAnchorWidth = Math.max(getDesiredWidth(suggestions), mAnchorWidth);
-        mViewAndroidDelegate.setAnchorViewPosition(mAnchorView, mAnchorX, mAnchorY, mAnchorWidth,
-                mAnchorHeight);
-    }
-
-    /**
-     * Overrides the default dismiss behavior to request the controller to dismiss the view.
-     */
-    @Override
-    public void dismiss() {
-        mAutofillCallback.requestHide();
-    }
-
-    /**
-     * Hides the popup and removes the anchor view from the ContainerView.
-     */
-    public void hide() {
-        super.dismiss();
-        mAnchorView.removeOnLayoutChangeListener(mLayoutChangeListener);
-        mViewAndroidDelegate.releaseAnchorView(mAnchorView);
-    }
-
-    /**
-     * Get desired popup window width by calculating the maximum text length from Autofill data.
-     * @param data Autofill suggestion data.
-     * @return The popup window width in DIP.
-     */
-    private float getDesiredWidth(AutofillSuggestion[] data) {
-        if (mNameViewPaint == null || mLabelViewPaint == null) {
-            LayoutInflater inflater =
-                    (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
-            View layout = inflater.inflate(R.layout.autofill_text, null);
-            TextView nameView = (TextView) layout.findViewById(R.id.autofill_name);
-            mNameViewPaint = nameView.getPaint();
-            TextView labelView = (TextView) layout.findViewById(R.id.autofill_label);
-            mLabelViewPaint = labelView.getPaint();
-        }
-
-        float maxTextWidth = 0;
-        Rect bounds = new Rect();
-        for (int i = 0; i < data.length; ++i) {
-            bounds.setEmpty();
-            String name = data[i].mName;
-            float width = 0;
-            mNameViewPaint.getTextBounds(name, 0, name.length(), bounds);
-            width += bounds.width();
-
-            bounds.setEmpty();
-            String label = data[i].mLabel;
-            mLabelViewPaint.getTextBounds(label, 0, label.length(), bounds);
-            width += bounds.width();
-            maxTextWidth = Math.max(width, maxTextWidth);
-        }
-        // Scale it down to make it unscaled by screen density.
-        maxTextWidth = maxTextWidth / mContext.getResources().getDisplayMetrics().density;
-        // Adding padding.
-        return maxTextWidth + TEXT_PADDING_DP;
-    }
-
-    @Override
-    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
-        mAutofillCallback.suggestionSelected(position);
-    }
-
-}