Synnefo » Pithos Web Client

/*

 * Copyright 2011-2012 GRNET S.A. All rights reserved.

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 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

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 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. Redistributions in binary form must reproduce the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer in the documentation and/or other materials

 *      provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

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 * The views and conclusions contained in the software and

 * documentation are those of the authors and should not be

 * interpreted as representing official policies, either expressed

 * or implied, of GRNET S.A.

 */

package gr.grnet.pithos.web.client.grouptree;

import gr.grnet.pithos.web.client.Pithos;

import gr.grnet.pithos.web.client.commands.CreateGroupCommand;

import gr.grnet.pithos.web.client.foldertree.File;

import gr.grnet.pithos.web.client.grouptree.GroupTreeView.Templates;

import java.util.HashMap;

import java.util.HashSet;

import java.util.Map;

import com.google.gwt.cell.client.AbstractCell;

import com.google.gwt.cell.client.Cell;

import com.google.gwt.event.dom.client.ContextMenuEvent;

import com.google.gwt.safehtml.shared.SafeHtmlBuilder;

import com.google.gwt.user.client.ui.AbstractImagePrototype;

import com.google.gwt.view.client.ListDataProvider;

import com.google.gwt.view.client.SelectionChangeEvent;

import com.google.gwt.view.client.SingleSelectionModel;

import com.google.gwt.view.client.TreeViewModel;

public class GroupTreeViewModel implements TreeViewModel {

    protected Pithos app;

        private Cell<Group> groupCell = new AbstractCell<Group>(ContextMenuEvent.getType().getName()) {

                @Override

                public void render(Context context,        Group value, SafeHtmlBuilder sb) {

            String html = AbstractImagePrototype.create(GroupTreeView.images.group()).getHTML();

            sb.appendHtmlConstant(html).appendHtmlConstant(" ");

            sb.append(Templates.INSTANCE.nameSpan(value.getName()));

                }

        @Override

        public void onBrowserEvent(Cell.Context context, com.google.gwt.dom.client.Element parent, Group group, com.google.gwt.dom.client.NativeEvent event, com.google.gwt.cell.client.ValueUpdater<Group> valueUpdater) {

                if (!group.equals(createGroup)) {

                    GroupTreeViewModel.this.groupSelectionModel.setSelected(group, true);

                    if (event.getType().equals(ContextMenuEvent.getType().getName())) {

                        GroupContextMenu menu = new GroupContextMenu(app, GroupTreeView.images, group);

                        menu.setPopupPosition(event.getClientX(), event.getClientY());

                        menu.show();

                    }

                }

        }

        };

    private Cell<User> userCell = new AbstractCell<User>(ContextMenuEvent.getType().getName()) {

                @Override

                public void render(Context context,        User value, SafeHtmlBuilder sb) {

            String html = AbstractImagePrototype.create(GroupTreeView.images.user()).getHTML();

            sb.appendHtmlConstant(html).appendHtmlConstant(" ");

            sb.append(Templates.INSTANCE.nameSpan(value.getName()));

                }

        @Override

        public void onBrowserEvent(Cell.Context context, com.google.gwt.dom.client.Element parent, User user, com.google.gwt.dom.client.NativeEvent event, com.google.gwt.cell.client.ValueUpdater<User> valueUpdater) {

            GroupTreeViewModel.this.userSelectionModel.setSelected(user, true);

            if (event.getType().equals(ContextMenuEvent.getType().getName())) {

                UserContextMenu menu = new UserContextMenu(app, GroupTreeView.images, user);

                menu.setPopupPosition(event.getClientX(), event.getClientY());

                menu.show();

            }

        }

    };

    protected ListDataProvider<Group> groupsDataProvider = new ListDataProvider<Group>();

    protected Map<Group, ListDataProvider<User>> userDataProviderMap = new HashMap<Group, ListDataProvider<User>>();

    SingleSelectionModel<Group> groupSelectionModel;

    SingleSelectionModel<User> userSelectionModel;

    final Group createGroup = new Group("Create new group...");

    public GroupTreeViewModel(Pithos _app) {

        app = _app;

            groupSelectionModel = new SingleSelectionModel<Group>();

            app.addSelectionModel(groupSelectionModel);

            groupSelectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {

                        @Override

                        public void onSelectionChange(SelectionChangeEvent event) {

                                Group selected = groupSelectionModel.getSelectedObject();

                                if (selected != null) {

                                        app.deselectOthers(app.getGroupTreeView(), groupSelectionModel);

                                        app.showFiles(new HashSet<File>());

                                        app.hideUploadArea();

                                        app.upload.setEnabled(false);

                                        app.showRelevantToolbarButtons();

                                        if (selected.equals(createGroup)) {

                                                new CreateGroupCommand(app, null).execute();

                                                groupSelectionModel.setSelected(createGroup, false);

                                        }

                                }

                                else {

                                        if (app.getSelectedTree().equals(app.getGroupTreeView()))

                                                app.setSelectedTree(null);

                                        if (app.getSelectedTree() == null)

                                                app.showRelevantToolbarButtons();

                                }

                        }

                });

            userSelectionModel = new SingleSelectionModel<User>();

            app.addSelectionModel(userSelectionModel);

            userSelectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {

                        @Override

                        public void onSelectionChange(SelectionChangeEvent event) {

                                if (userSelectionModel.getSelectedObject() != null) {

                                        app.deselectOthers(app.getGroupTreeView(), userSelectionModel);

                                        app.showFiles(new HashSet<File>());

                                        app.showRelevantToolbarButtons();

                                }

                                else {

                                        if (app.getSelectedTree().equals(app.getGroupTreeView()))

                                                app.setSelectedTree(null);

                                        if (app.getSelectedTree() == null)

                                                app.showRelevantToolbarButtons();

                                }

                        }

                });

}

    @Override

    public <T> NodeInfo<?> getNodeInfo(T value) {

        if (value == null) {

                groupsDataProvider.getList().clear();

                       groupsDataProvider.getList().addAll(app.getAccount().getGroups());

                       groupsDataProvider.getList().add(createGroup);

            return new DefaultNodeInfo<Group>(groupsDataProvider, groupCell, groupSelectionModel, null);

        }

            Group g = (Group) value;

                if (userDataProviderMap.get(g) == null) {

                        userDataProviderMap.put(g, new ListDataProvider<User>());

                }

                final ListDataProvider<User> dataProvider = userDataProviderMap.get(g);

                dataProvider.getList().clear();

                for (String u : g.getMembers())

                        dataProvider.getList().add(new User(u, g));

            return new DefaultNodeInfo<User>(dataProvider, userCell, userSelectionModel, null);

    }

        @Override

    public boolean isLeaf(Object o) {

        if (o instanceof User) {

                       return true;

        }

        else if (o instanceof Group)

                return ((Group) o).getMembers().isEmpty();

        return false;

    }

        public void updateGroupNode(Group group) {

                if (group == null) {

                        groupsDataProvider.getList().clear();

                        groupsDataProvider.getList().addAll(app.getAccount().getGroups());

                       groupsDataProvider.getList().add(createGroup);

                }

                else {

                        if (userDataProviderMap.get(group) == null) {

                                userDataProviderMap.put(group, new ListDataProvider<User>());

                        }

                        final ListDataProvider<User> dataProvider = userDataProviderMap.get(group);

                        dataProvider.getList().clear();

                        for (String u : group.getMembers())

                                dataProvider.getList().add(new User(u, group));

                }

        }

        public Object getSelectedObject() {

                if (groupSelectionModel.getSelectedObject() != null)

                        return groupSelectionModel.getSelectedObject();

                if (userSelectionModel.getSelectedObject() != null)

                        return userSelectionModel.getSelectedObject();

                return null;

        }

}