gecko/mobile/android/base/home/HomeListView.java

/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.gecko.home;

import org.mozilla.gecko.R;
import org.mozilla.gecko.home.HomePager.OnUrlOpenListener;

import android.content.Context;
import android.content.res.TypedArray;
import android.database.Cursor;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ListView;

/**
 * HomeListView is a custom extension of ListView, that packs a HomeContextMenuInfo
 * when any of its rows is long pressed.
 */
public class HomeListView extends ListView
                          implements OnItemLongClickListener {

    // ContextMenuInfo associated with the currently long pressed list item.
    private HomeContextMenuInfo mContextMenuInfo;

    // On URL open listener
    protected OnUrlOpenListener mUrlOpenListener;

    // Top divider
    private boolean mShowTopDivider;

    // ContextMenuInfo maker
    private ContextMenuInfoFactory mContextMenuInfoFactory;

    public HomeListView(Context context) {
        this(context, null);
    }

    public HomeListView(Context context, AttributeSet attrs) {
        this(context, attrs, R.attr.homeListViewStyle);
    }

    public HomeListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.HomeListView, defStyle, 0);
        mShowTopDivider = a.getBoolean(R.styleable.HomeListView_topDivider, false);
        a.recycle();

        setOnItemLongClickListener(this);
    }

    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();

        final Drawable divider = getDivider();
        if (mShowTopDivider && divider != null) {
            final int dividerHeight = getDividerHeight();
            final View view = new View(getContext());
            view.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, dividerHeight));
            addHeaderView(view);
        }
    }

    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();

        mUrlOpenListener = null;
    }

    @Override
    public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
        Object item = parent.getItemAtPosition(position);

        // HomeListView could hold headers too. Add a context menu info only for its children.
        if (item instanceof Cursor) {
            Cursor cursor = (Cursor) item;
            if (cursor == null || mContextMenuInfoFactory == null) {
                mContextMenuInfo = null;
                return false;
            }

            mContextMenuInfo = mContextMenuInfoFactory.makeInfoForCursor(view, position, id, cursor);
            return showContextMenuForChild(HomeListView.this);

        } else {
            mContextMenuInfo = null;
            return false;
        }
    }

    @Override
    public ContextMenuInfo getContextMenuInfo() {
        return mContextMenuInfo;
    }

    @Override
    public void setOnItemClickListener(final AdapterView.OnItemClickListener listener) {
        if (listener == null) {
            super.setOnItemClickListener(null);
            return;
        }

        super.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                if (mShowTopDivider) {
                    position--;
                }

                listener.onItemClick(parent, view, position, id);
            }
        });
    }

    public void setContextMenuInfoFactory(final ContextMenuInfoFactory factory) {
        mContextMenuInfoFactory = factory;
    }

    public OnUrlOpenListener getOnUrlOpenListener() {
        return mUrlOpenListener;
    }

    public void setOnUrlOpenListener(OnUrlOpenListener listener) {
        mUrlOpenListener = listener;
    }

    /*
     * Interface for creating ContextMenuInfo from cursors
     */
    public interface ContextMenuInfoFactory {
    	public HomeContextMenuInfo makeInfoForCursor(View view, int position, long id, Cursor cursor);
    }
}