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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.ui.html;
import com.codename1.ui.Button;
import com.codename1.ui.events.ActionEvent;
import com.codename1.ui.events.ActionListener;
import java.util.Enumeration;
import java.util.Vector;
/**
* HTMLLink is a simple extension of Button that nullifies all its borders and attaches itself as an ActionListener to respond to link clicks.
* Since a link can be split on several lines, the concept of parent and child links is introduced here. A parent link is the first segment of the link
* while the children are all the other segments. Only the parent is focusable (so multiple focuses on the same links will be avoided).
* When the parent is focused, all the children get setFocus(true). Note that for pointer events, the children are also active.
*
* @author Ofir Leitner
*/
class HTMLLink extends Button implements ActionListener {
String link;
HTMLComponent htmlC;
Vector childLinks;
HTMLLink parentLink;
boolean linkVisited;
boolean parentChangesOnFocus;
boolean isMap; // denotes that this is a server image map (img tag with the ismap property, and a child of the a tag)
/**
* Constructs the HTMLLink
*
* @param text The link's text
* @param link The link URL
* @param htmlC The HTMLComponent this link is in
* @param parentLink THis link's parent if available
*/
HTMLLink(String text,String link,HTMLComponent htmlC,HTMLLink parentLink,boolean linkVisited) {
super(text);
setUIID("HTMLLink");
this.link=link;
this.htmlC=htmlC;
this.parentLink=parentLink;
this.linkVisited=linkVisited;
setTickerEnabled(false);
addActionListener(this);
if (parentLink!=null) {
setFocusable(false);
parentLink.addChildLink(this);
}
if (htmlC.firstFocusable==null) {
htmlC.firstFocusable=this;
}
}
/**
* Overrides setFocus in order to focus all associated components
*
* @param focused true to apply focused style, false to remove
*/
public void setFocus(boolean focused) {
if (parentLink!=null) {
parentLink.setChildrenFocused(focused);
parentLink.superSetFocus(focused);
} else {
setChildrenFocused(focused);
superSetFocus(focused);
}
}
/**
* Since setFocus calls the setFocus of other children, we need this method to call the super setFocus (which means just focus this specific component, and not its associated component)
*
* @param focused true to apply focused style, false to remove
*/
private void superSetFocus(boolean focused) {
super.setFocus(focused);
}
/**
* Applies or removes the focus style to all this link children (if any)
*
* @param focused true to apply focused style, false to remove
*/
private void setChildrenFocused(boolean focused) {
if (parentLink!=null) {
return;
}
if (childLinks!=null) {
for (Enumeration e=childLinks.elements();e.hasMoreElements();) {
HTMLLink child=(HTMLLink)e.nextElement();
//child.setFocus(focused);
child.superSetFocus(focused);
child.repaint();
}
}
// Some CSS attributes, such as margin/padding are applies on the parent container of links and not on them
// This is because setting a margin per word would not get the desired result.
// When setting focus to the parent (which is an unfocusable container) it will get the desired properties
if (parentChangesOnFocus) {
getParent().setFocus(focused);
getParent().revalidate();
}
}
/**
* If this is called it indicates that when the link is focused, its parent should change to focused as well
*/
void setParentChangesOnFocus() {
if (parentLink==null) {
parentChangesOnFocus=true;
}
}
/**
* Adds the given link as the child of this link
*
* @param childLink The child link to add
*/
void addChildLink(HTMLLink childLink) {
if (childLinks==null) {
childLinks=new Vector();
}
childLinks.addElement(childLink);
}
/**
* Triggered when the link is pressed and then it requests the link (or goes to an anchor within the page)
*/
public void actionPerformed(ActionEvent evt) {
if ((!HTMLComponent.PROCESS_HTML_MP1_ONLY) && (isMap) && (evt.getX()!=-1)) { // process mp1 is checked in assigning ismap as well, but this check here should obfuscate out this method override
processLink(htmlC, link+"?"+(evt.getX()-getAbsoluteX())+","+(evt.getY()-getAbsoluteY()));
} else {
processLink(htmlC, link);
}
}
static void processLink(HTMLComponent htmlC,String link) {
boolean process=true;
if (htmlC.getHTMLCallback()!=null) {
process=htmlC.getHTMLCallback().linkClicked(htmlC, htmlC.convertURL(link));
}
if (process){
if (!link.startsWith("#")) {
htmlC.setPage(htmlC.convertURL(link));
} else { //local anchor
String anchorName=link.substring(1);
htmlC.goToAnchor(anchorName);
}
}
}
}
