/*
* @(#)HrefButtonArea.java 1.14 04/07/26
*
* Copyright (c) 2004 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* -Redistribution of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* -Redistribution 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.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
* INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
* EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or intended
* for use in the design, construction, operation or maintenance of any
* nuclear facility.
*/
/*
* @(#)HrefButtonArea.java 1.14 04/07/26
*/
import java.awt.Graphics;
import java.awt.Image;
import java.net.URL;
import java.net.MalformedURLException;
/**
* An improved "Fetch a URL" ImageArea class.
* This class extends the basic ImageArea Class to fetch a URL when
* the user clicks in the area. In addition, special custom highlights
* are used to make the area look and feel like a 3-D button.
*
* @author Jim Graham
* @version 1.14, 07/26/04
*/
class HrefButtonArea extends ImageMapArea {
/** The URL to be fetched when the user clicks on this area. */
URL anchor;
/** The highlight image for when the button is "UP". */
Image upImage;
/** The highlight image for when the button is "DOWN". */
Image downImage;
/** This flag indicates if the "button" is currently pressed. */
boolean pressed = false;
/** The border size for the 3-D effect. */
int border = 5;
/**
* The argument string is the URL to be fetched.
* This method also constructs the various highlight images needed
* to achieve the 3-D effect.
*/
public void handleArg(String arg) {
try {
anchor = new URL(parent.getDocumentBase(), arg);
} catch (MalformedURLException e) {
anchor = null;
}
if (border * 2 > W || border * 2 > H) {
border = Math.min(W, H) / 2;
}
}
public void makeImages() {
upImage = parent.getHighlight(X, Y, W, H,
new ButtonFilter(false,
parent.hlpercent,
border, W, H));
downImage = parent.getHighlight(X, Y, W, H,
new ButtonFilter(true,
parent.hlpercent,
border, W, H));
}
public boolean imageUpdate(Image img, int infoflags,
int x, int y, int width, int height) {
if (img == (pressed ? downImage : upImage)) {
return parent.imageUpdate(img, infoflags, x + X, y + Y,
width, height);
} else {
return (img == downImage || img == upImage);
}
}
/**
* The isTerminal method indicates whether events should propagate
* to the areas underlying this one.
*/
public boolean isTerminal() {
return true;
}
/**
* The status message area is updated to show the destination URL.
* The graphical highlight is achieved using the ButtonFilter.
*/
public void highlight(Graphics g) {
if (entered) {
g.drawImage(pressed ? downImage : upImage, X, Y, this);
}
}
public void enter() {
showStatus((anchor != null)
? "Go To " + anchor.toExternalForm()
: null);
repaint();
}
public void exit() {
showStatus(null);
repaint();
}
/**
* Since the highlight changes when the button is pressed, we need
* to record the "pressed" state and induce a repaint.
*/
public boolean press() {
pressed = true;
repaint();
return true;
}
/**
* The new URL is fetched when the user releases the mouse button
* only if they are still in the area.
*/
public boolean lift(int x, int y) {
pressed = false;
repaint();
if (inside(x, y) && anchor != null) {
showDocument(anchor);
}
return true;
}
}
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