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VCAFE.3.0A
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HrefButtonArea.java
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1998-09-15
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/*
* @(#)HrefButtonArea.java 1.8 98/03/18
*
* Copyright (c) 1995-1997 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* 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 AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE 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 SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
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 1.8, 03/18/98
*/
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;
}
}