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/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores
* CA 94065 USA or visit www.oracle.com if you need additional information or
* have any questions.
*/
package com.codename1.components;
import com.codename1.io.ConnectionRequest;
import com.codename1.ui.Button;
import com.codename1.ui.Command;
import com.codename1.ui.Component;
import com.codename1.ui.Container;
import com.codename1.ui.Display;
import com.codename1.ui.Form;
import com.codename1.ui.Label;
import com.codename1.ui.List;
import com.codename1.ui.layouts.BorderLayout;
import com.codename1.ui.events.ActionEvent;
import com.codename1.ui.events.ActionListener;
import com.codename1.io.NetworkEvent;
import com.codename1.io.NetworkManager;
import com.codename1.io.services.ImageDownloadService;
import com.codename1.io.services.RSSService;
import com.codename1.ui.Image;
import com.codename1.ui.layouts.BoxLayout;
import com.codename1.ui.list.DefaultListModel;
import com.codename1.ui.list.GenericListCellRenderer;
import com.codename1.ui.TextArea;
import java.util.Hashtable;
import java.util.Vector;
/**
* A List implementing an RSS reader that automatically populates itself with content
* from the RSS chanel. When clicking an article it displays the HTML content of said
* article in a new Form.
*
* @author Shai Almog
*/
public class RSSReader extends List {
private Vector existingData;
private String url = "https://codenameone.blogspot.com/feeds/posts/default?alt=rss";
private RSSService service;
private int limit = 20;
private boolean waitingForResponseLock;
private boolean blockList;
private String progressTitle = "Fetching RSS";
private boolean displayProgressPercentage = true;
private Image iconPlaceholder;
private static final Hashtable MORE = new Hashtable();
static {
MORE.put("title", "More");
MORE.put("details", "Fetch More Elements");
}
private boolean designMode;
/**
* Sets the form/container to which the RSS will navigate when clicking a RSS
* entry
*/
private Container targetContainer;
/**
* Indicates whether a back command should be added implicitly to the target container
*/
private boolean addBackToTaget = true;
/**
* Creates an rss reader instance
*/
public RSSReader() {
setUIID("RSSReader");
setRenderer(new GenericListCellRenderer(createRendererContainer(), createRendererContainer()));
addActionListener(new EventHandler());
}
/**
* Set the description for the "more" request
*
* @param d the description
*/
public static void setMoreDescription(String d) {
MORE.put("description", d);
}
/**
* Set the title for the "more" request
*
* @param t new title
*/
public static void setMoreTitle(String t) {
MORE.put("title", t);
}
private Container createRendererContainer() {
Container entries = new Container(new BoxLayout(BoxLayout.Y_AXIS));
entries.setUIID("RSSEntry");
Label title = new Label();
title.setName("title");
title.setUIID("RSSTitle");
entries.addComponent(title);
TextArea description = new TextArea(2, 30);
description.setGrowByContent(false);
description.setName("details");
description.setUIID("RSSDescription");
description.setScrollVisible(false);
entries.addComponent(description);
if(iconPlaceholder != null) {
Container wrap = new Container(new BorderLayout());
wrap.addComponent(BorderLayout.CENTER, entries);
Label icon = new Label();
icon.setIcon(iconPlaceholder);
icon.setUIID("RSSIcon");
icon.setName("icon");
wrap.addComponent(BorderLayout.WEST, icon);
entries = wrap;
}
return entries;
}
/**
* The URL of the RSS stream
*
* @param url The URL of the RSS stream
*/
public void setURL(String url) {
this.url = url;
}
/**
* Send the request to the server, will only work once. This is called implicitly
* when the list is initialized
*/
public void sendRequest() {
if(service == null) {
service = new RSSService(url, limit);
if(iconPlaceholder != null) {
service.setIconPlaceholder(iconPlaceholder);
}
service.addResponseListener(new EventHandler());
if(blockList) {
Progress p = new Progress(progressTitle, service, displayProgressPercentage);
p.setAutoShow(true);
p.setDisposeOnCompletion(true);
}
setHint(progressTitle);
NetworkManager.getInstance().addToQueue(service);
}
}
/**
* {@inheritDoc}
*/
protected void initComponent() {
super.initComponent();
if(designMode) {
setHint("RSS Data Will Show Here");
} else {
sendRequest();
}
}
/**
* The URL of the RSS stream
*
* @return The URL of the RSS stream
*/
public String getURL() {
return url;
}
/**
* @return the iconPlaceholder
*/
public Image getIconPlaceholder() {
return iconPlaceholder;
}
/**
* @param iconPlaceholder the iconPlaceholder to set
*/
public void setIconPlaceholder(Image iconPlaceholder) {
this.iconPlaceholder = iconPlaceholder;
if(service != null) {
service.setIconPlaceholder(iconPlaceholder);
}
setRenderer(new GenericListCellRenderer(createRendererContainer(), createRendererContainer()));
}
class Listener implements ActionListener {
private String url;
public Listener(String url) {
this.url = url;
}
public void actionPerformed(ActionEvent evt) {
Display.getInstance().execute(url);
}
}
void updateComponentValues(Container root, Hashtable h) {
int c = root.getComponentCount();
for(int iter = 0 ; iter < c ; iter++) {
Component current = root.getComponentAt(iter);
// the comparison assumes that other container subclases are really just
// custom components e.g. tree, table and HTMLComponent as well as third party
// subclasses
if(current.getClass() == com.codename1.ui.Container.class ||
current.getClass() == com.codename1.ui.Tabs.class) {
updateComponentValues((Container)current, h);
continue;
}
String n = current.getName();
if(n != null) {
String val = (String)h.get(n);
if(val != null) {
if(current instanceof Button) {
final String url = (String)val;
((Button)current).addActionListener(new Listener(url));
continue;
}
if(current instanceof Label) {
((Label)current).setText(val);
continue;
}
if(current instanceof TextArea) {
((TextArea)current).setText(val);
continue;
}
if(current instanceof WebBrowser) {
((WebBrowser)current).setPage(val, null);
continue;
}
}
}
}
}
class BackCommand extends Command {
private Form sourceForm;
public BackCommand(Form sourceForm) {
super("Back");
this.sourceForm = sourceForm;
}
public void actionPerformed(ActionEvent ev) {
sourceForm.showBack();
}
}
/**
* Shows a form containing the RSS entry
*
* @param h the parsed entry
*/
protected void showRSSEntry(Hashtable h) {
Form newForm = null;
if(targetContainer != null) {
if(targetContainer instanceof Form) {
newForm = (Form)targetContainer;
} else {
newForm = new Form((String)h.get("title"));
newForm.setLayout(new BorderLayout());
newForm.addComponent(BorderLayout.CENTER, targetContainer);
}
updateComponentValues(newForm, h);
} else {
newForm = new Form((String)h.get("title"));
newForm.setScrollable(false);
WebBrowser c = new WebBrowser();
String s = (String)h.get("description");
s = "" + s + "";
c.setPage(s, null);
newForm.setLayout(new BorderLayout());
newForm.addComponent(BorderLayout.CENTER, c);
}
if(addBackToTaget) {
final Form sourceForm = Display.getInstance().getCurrent();
Command back = new BackCommand(sourceForm);
newForm.addCommand(back);
newForm.setBackCommand(back);
}
newForm.show();
}
/**
* Places a limit on the number of RSS entries requested from the server
* @return the limit
*/
public int getLimit() {
return limit;
}
/**
* Places a limit on the number of RSS entries requested from the server
*
* @param limit the limit to set
*/
public void setLimit(int limit) {
this.limit = limit;
}
/**
* {@inheritDoc}
*/
public String[] getPropertyNames() {
return new String[] {"limit", "url", "blockList", "progressTitle", "displayProgressPercentage", "target"};
}
/**
* {@inheritDoc}
*/
public Class[] getPropertyTypes() {
return new Class[] {Integer.class, String.class, Boolean.class, String.class, Boolean.class, Container.class};
}
/**
* {@inheritDoc}
*/
public Object getPropertyValue(String name) {
if(name.equals("limit")) {
return new Integer(limit);
}
if(name.equals("url")) {
return url;
}
if(name.equals("blockList")) {
if(blockList) {
return Boolean.TRUE;
}
return Boolean.FALSE;
}
if(name.equals("progressTitle")) {
return progressTitle;
}
if(name.equals("displayProgressPercentage")) {
if(displayProgressPercentage) {
return Boolean.TRUE;
}
return Boolean.FALSE;
}
if(name.equals("target")) {
return targetContainer;
}
if(name.equals("$designMode")) {
if(designMode) {
return Boolean.TRUE;
}
return Boolean.FALSE;
}
return null;
}
/**
* {@inheritDoc}
*/
public String setPropertyValue(String name, Object value) {
if(name.equals("limit")) {
limit = ((Integer)value).intValue();
return null;
}
if(name.equals("url")) {
url = (String)value;
return null;
}
if(name.equals("blockList")) {
blockList = ((Boolean)value).booleanValue();
return null;
}
if(name.equals("progressTitle")) {
progressTitle = (String)value;
return null;
}
if(name.equals("displayProgressPercentage")) {
displayProgressPercentage = ((Boolean)value).booleanValue();
return null;
}
if(name.equals("target")) {
targetContainer = (Container)value;
return null;
}
if(name.equals("$designMode")) {
designMode = ((Boolean)value).booleanValue();
return null;
}
return super.setPropertyValue(name, value);
}
/**
* @return the blockList
*/
public boolean isBlockList() {
return blockList;
}
/**
* @param blockList the blockList to set
*/
public void setBlockList(boolean blockList) {
this.blockList = blockList;
}
/**
* @return the progressTitle
*/
public String getProgressTitle() {
return progressTitle;
}
/**
* @param progressTitle the progressTitle to set
*/
public void setProgressTitle(String progressTitle) {
this.progressTitle = progressTitle;
}
/**
* The form/container to which the RSS will navigate when clicking a RSS
* entry
* @return the targetContainer
*/
public Container getTargetContainer() {
return targetContainer;
}
/**
* The form/container to which the RSS will navigate when clicking a RSS
* entry
* @param targetContainer the targetContainer to set
*/
public void setTargetContainer(Container targetContainer) {
this.targetContainer = targetContainer;
}
/**
* Indicates whether a back command should be added implicitly to the target container
* @return the addBackToTaget
*/
public boolean isAddBackToTaget() {
return addBackToTaget;
}
/**
* Indicates whether a back command should be added implicitly to the target container
* @param addBackToTaget the addBackToTaget to set
*/
public void setAddBackToTaget(boolean addBackToTaget) {
this.addBackToTaget = addBackToTaget;
}
class EventHandler implements ActionListener {
private void downloadImage(Hashtable h, int offset) {
if(iconPlaceholder != null) {
String url = (String)h.get("thumb");
if(url != null) {
ImageDownloadService.createImageToStorage(url, RSSReader.this, getModel(), offset, "icon", url.replace('/', '_').replace(':', '_'), iconPlaceholder, ConnectionRequest.PRIORITY_REDUNDANT);
}
}
}
public void actionPerformed(ActionEvent evt) {
if(evt instanceof NetworkEvent) {
waitingForResponseLock = false;
NetworkEvent e = (NetworkEvent)evt;
Vector v = (Vector)e.getMetaData();
RSSService s = (RSSService)e.getConnectionRequest();
if(existingData != null) {
existingData.removeElement(MORE);
for(int iter = 0 ; iter < v.size() ; iter++) {
Hashtable h = (Hashtable)v.elementAt(iter);
existingData.addElement(h);
}
} else {
existingData = v;
}
if(s.hasMore()) {
v.addElement(MORE);
}
setModel(new DefaultListModel(existingData));
for(int iter = 0 ; iter < existingData.size() ; iter++) {
Hashtable h = (Hashtable)existingData.elementAt(iter);
Object icn = h.get("icon");
if(icn != null && icn == iconPlaceholder) {
downloadImage(h, iter);
}
}
return;
}
Hashtable sel = (Hashtable)getSelectedItem();
if(sel == MORE) {
if(waitingForResponseLock) {
return;
}
waitingForResponseLock = true;
service = new RSSService(url, limit, existingData.size() - 1);
if(iconPlaceholder != null) {
service.setIconPlaceholder(iconPlaceholder);
}
service.addResponseListener(new EventHandler());
Progress p = new Progress("Fetching RSS", service, displayProgressPercentage);
p.setAutoShow(true);
p.setDisposeOnCompletion(true);
NetworkManager.getInstance().addToQueue(service);
} else {
showRSSEntry(sel);
}
}
}
}
