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JSAMPLES.Z
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ClickArea.java
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1998-05-08
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/*
* @(#)ClickArea.java 1.6 96/12/06
*
* Copyright (c) 1994-1996 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;
/**
* An click feedback ImageArea class.
* This class extends the basic ImageArea Class to show the locations
* of clicks in the image in the status message area. This utility
* ImageArea class is useful when setting up ImageMaps.
*
* @author Jim Graham
* @version 1.6, 12/06/96
*/
class ClickArea extends ImageMapArea {
/** The X location of the last mouse press. */
int startx;
/** The Y location of the last mouse press. */
int starty;
/** A boolean to indicate whether we are currently being dragged. */
boolean dragging;
static String ptstr(int x, int y) {
return "("+x+", "+y+")";
}
/**
* When the user presses the mouse button, start showing coordinate
* feedback in the status message line.
*/
public boolean press(int x, int y) {
showStatus("Clicked at "+ptstr(x, y));
startx = x;
starty = y;
dragging = true;
return false;
}
/**
* Update the coordinate feedback every time the user moves the mouse
* while he has the button pressed.
*/
public boolean drag(int x, int y) {
showStatus("Rectangle from "+ptstr(startx, starty)
+" to "+ptstr(x, y)
+" is "+(x-startx)+"x"+(y-starty));
return false;
}
/**
* Update the coordinate feedback one last time when the user releases
* the mouse button.
*/
public boolean lift(int x, int y) {
dragging = false;
return drag(x, y);
}
/**
* This utility method returns the status string this area wants to
* put into the status bar. If this area is currently animating
* a message, then that message takes precedence over any other area
* that a higher stacked area may want to display, otherwise the
* message from the higher stacked area takes precedence.
*/
public String getStatus(String prevmsg) {
if (dragging) {
return (status != null) ? status : prevmsg;
} else {
return (prevmsg == null) ? status : prevmsg;
}
}
}