com.google.livingstories.client.lsp.views.contentitems.ContainerStreamViewFooter.java Source code

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Here is the source code for com.google.livingstories.client.lsp.views.contentitems.ContainerStreamViewFooter.java

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/**
 * Copyright 2010 Google Inc.
 *
 * 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.google.livingstories.client.lsp.views.contentitems;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiFactory;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.DeckPanel;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.InlineHTML;
import com.google.gwt.user.client.ui.InlineLabel;
import com.google.gwt.user.client.ui.Widget;
import com.google.livingstories.client.BaseContentItem;
import com.google.livingstories.client.Importance;
import com.google.livingstories.client.lsp.event.BlockToggledEvent;
import com.google.livingstories.client.lsp.event.EventBus;
import com.google.livingstories.client.lsp.views.Resources;
import com.google.livingstories.client.lsp.views.ShareLinkWidget;
import com.google.livingstories.client.ui.ToggleDisclosurePanel;
import com.google.livingstories.client.ui.WindowScroll;
import com.google.livingstories.client.util.LivingStoryControls;

import java.util.Map;

/**
 * Footer to display in a container view.
 * Generally consists of a 'Read more' link and either some navigation links
 * that open the item and jump to an element, or a 'Share' link that lets the
 * user copy/paste a permalink for the entry. 
 */
public class ContainerStreamViewFooter extends Composite {
    private static ContainerStreamViewFooterUiBinder uiBinder = GWT.create(ContainerStreamViewFooterUiBinder.class);

    interface ContainerStreamViewFooterUiBinder extends UiBinder<Widget, ContainerStreamViewFooter> {
    }

    @UiField
    DeckPanel text;
    @UiField
    DeckPanel links;
    @UiField
    FlowPanel navLinks;

    private Long contentItemId;
    private Importance importance;
    private HandlerRegistration toggleEventHandler;

    public ContainerStreamViewFooter(BaseContentItem contentItem) {
        contentItemId = contentItem.getId();
        importance = contentItem.getImportance();

        initWidget(uiBinder.createAndBindUi(this));
        setOpen(false);

        toggleEventHandler = EventBus.INSTANCE.addHandler(BlockToggledEvent.TYPE, new BlockToggledEvent.Handler() {
            @Override
            public void onToggle(BlockToggledEvent e) {
                if (contentItemId.equals(e.getContentItemId())) {
                    setOpen(e.isOpened());
                }
            }
        });
    }

    @UiFactory
    ShareLinkWidget makeShareLink() {
        return new ShareLinkWidget(contentItemId);
    }

    @Override
    protected void onUnload() {
        super.onUnload();
        if (toggleEventHandler != null) {
            toggleEventHandler.removeHandler();
            toggleEventHandler = null;
        }
    }

    public void addNavLinks(Map<String, Widget> typeStringToNavLinkTarget,
            final ToggleDisclosurePanel disclosurePanel) {
        for (Map.Entry<String, Widget> e : typeStringToNavLinkTarget.entrySet()) {
            InlineLabel link = new InlineLabel(e.getKey());
            link.setStylePrimaryName(Resources.INSTANCE.css().clickable());

            if (navLinks.getWidgetCount() > 1) {
                navLinks.add(new InlineHTML("&nbsp;|&nbsp;")); // separator
            }
            navLinks.add(link);

            final Widget linkTarget = e.getValue();
            link.addClickHandler(new ClickHandler() {
                @Override
                public void onClick(ClickEvent event) {
                    // Consume this event, so that it doesn't cause the disclosurePanel to register the
                    // click
                    event.stopPropagation();
                    EventBus.INSTANCE
                            .fireEvent(new BlockToggledEvent(true, contentItemId).setOnFinish(new Command() {
                                @Override
                                public void execute() {
                                    WindowScroll.scrollTo(linkTarget.getAbsoluteTop(), new Command() {
                                        @Override
                                        public void execute() {
                                            LivingStoryControls.repositionAnchoredPanel();
                                        }
                                    });
                                }
                            }));
                }
            });
        }
        if (!typeStringToNavLinkTarget.isEmpty()) {
            navLinks.removeStyleName(Resources.INSTANCE.css().hidden());
        }
    }

    public void setOpen(boolean opened) {
        if (opened) {
            setVisible(true);
        } else if (importance == Importance.LOW) {
            setVisible(false);
        }
        int showIndex = opened ? 1 : 0;
        text.showWidget(showIndex);
        links.showWidget(showIndex);
    }

}