com.flatown.client.FavoritesPanel.java Source code

Introduction

Here is the source code for com.flatown.client.FavoritesPanel.java

Source

/*
 * Copyright 2007 Jared Flatow
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.flatown.client;

import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Window;

import com.google.gwt.user.client.ui.Widget;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.FocusPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.MouseListener;
import com.google.gwt.user.client.ui.MouseListenerAdapter;

import com.google.gwt.json.client.JSONValue;
import com.google.gwt.json.client.JSONArray;

/**
 * The panel holding all of our favorite {@link SearchBox searchboxes}.
 */
public class FavoritesPanel extends ScrollPanel implements DragHost {

    public static final FavoritesPanel Singleton = new FavoritesPanel();

    private VerticalPanel _favorites;
    private FocusPanel _listenerPanel;
    private DragBar _clicked;
    private MouseListener _dragListener;

    private FavoritesPanel() {
        _favorites = new VerticalPanel();
        _favorites.setStyleName("favorites");

        _listenerPanel = new FocusPanel(_favorites);
        _listenerPanel.addMouseListener(new MouseListenerAdapter() {
            public void onMouseLeave(Widget sender) {
                _clicked = null;
            }

            public void onMouseUp(Widget sender, int x, int y) {
                _clicked = null;
            }
        });

        setWidget(_listenerPanel);
        setStyleName("favoritesPanel");
        DOM.setStyleAttribute(getElement(), "maxHeight", Window.getClientHeight() - 50 + "px");

        _dragListener = new MouseListenerAdapter() {
            public void onMouseEnter(Widget sender) {
                if (sender instanceof DragBar) {
                    DragBar bar = (DragBar) sender;
                    if (isClicked() && _clicked != bar) {
                        int newPos = _favorites.getWidgetIndex(bar.getDragWidget());
                        _favorites.remove(_clicked.getDragWidget());
                        _favorites.insert(_clicked.getDragWidget(), newPos);
                    }
                }
            }

            public void onMouseDown(Widget sender, int x, int y) {
                if (sender instanceof DragBar)
                    _clicked = (DragBar) sender;
            }

            public void onMouseUp(Widget sender, int x, int y) {
                if (isClicked())
                    GBox.Prefs.saveFavorites();
            }
        };
    }

    /** Adds a SearchBox to the FavoritesPanel, but only if it doesn't already exist (and is non-empty) */
    public void addSearchBox(SearchBox searchBox) {
        if (!searchBox.getSearchQuery().equals("")
                && !containsSearch(searchBox.getSearchQuery(), searchBox.getDatabase())) {
            _favorites.add(searchBox);
            // have the searchbox search
            searchBox.getResultsBox().setVisible(searchBox.areResultsDisplayed());
            searchBox.search();
            GBox.Prefs.saveFavorites();
        }
    }

    public boolean remove(Widget w) {
        if (_favorites.remove(w)) {
            GBox.Prefs.saveFavorites();
            return true;
        }
        return false;
    }

    /** Checks to see if the FavoritesPanel contains a given search request */
    private boolean containsSearch(String searchQuery, String database) {
        for (int i = _favorites.getWidgetCount() - 1; i >= 0; i--) {
            Widget current = _favorites.getWidget(i);
            if (current instanceof SearchBox) {
                if (((SearchBox) current).getSearchQuery().equals(searchQuery)
                        && ((SearchBox) current).getDatabase().equals(database))
                    return true;
            }
        }
        return false;
    }

    /** Returns this FavoritesPanel as a JSONArray */
    public JSONValue toJSON() {
        JSONArray json = new JSONArray();
        for (int i = _favorites.getWidgetCount() - 1; i >= 0; i--) {
            Widget current = _favorites.getWidget(i);
            if (current instanceof SearchBox) {
                json.set(i, ((SearchBox) current).toJSON());
            }
        }
        return json;
    }

    /** Implement the DragHost interface */
    public MouseListener getDragListener() {
        return _dragListener;
    }

    public boolean isClicked() {
        return _clicked == null ? false : true;
    }
}