| addCursor |
(String name, Object value) |
yoix.awt |
| |
Creates a new cursor from
value,
which must be an
Image
or
String
that is not
NULL,
adds the new cursor to the
yoix.awt.Cursor
dictionary as the entry associated with
name,
and returns
1
if the operation succeeded and
0
if it failed, which usually means
name
has already been defined.
value
should usually be an
Image,
because the
hotspot,
paint,
and
size
fields in an
Image
let you control how the custom cursor is built.
A
value
that is a
String
should be the name of a cursor that is already defined in
yoix.awt.Cursor
or
the name a local a file or URL that contains a GIF or JPEG image
that will be used as the cursor.
It sounds easy, but a
String
argument is not as convenient as you might expect, because you do not
get any control over the cursor's size or hotspot.
Any
value
that
addCursor
accepts can also be assigned directly to the
cursor
field that is defined in all AWT or Swing components, however each assignment
(after the first one) involves overhead that can be eliminated using
addCursor.
In other words, a custom cursor that is used more than a few times
is a candidate that your application may want to add to
yoix.awt.Cursor
using
addCursor.
| |
| Example: |
The program,
import yoix.*.*;
Image triangle = {
int type = TYPE_RGBA;
Dimension size = {
double width = 36;
double height = 36;
};
paint(Rectangle r) {
Rectangle bbox;
graphics {
gsave();
initclip();
clippath();
bbox = pathbbox();
newpath();
moveto(0, 0);
rlineto(bbox.width, 0);
rlineto(0, bbox.height);
closepath();
setrgbcolor(0, 1, 1);
gsave();
fill();
grestore();
setrgbcolor(1, 0, 0);
setlinewidth(1);
stroke();
grestore();
hotspot = new Point {
double x = bbox.width/2;
double y = bbox.height/2;
};
}
}
};
addCursor("TRIANGLE", triangle);
Frame frame = {
BoxLayout layoutmanager;
Array layout = {
0,
new Button {
Object cursor = Cursor.TRIANGLE;
String text = "This is a test...";
mousePressed(e) {
cursor = NULL;
}
mouseReleased(e) {
cursor = "TRIANGLE";
}
},
0
};
};
frame.visible = TRUE;
draws a triangle in an image, uses the image to create a custom cursor named
TRIANGLE,
and then uses
TRIANGLE
as the cursor that is displayed by a button when it is not pressed.
| | |
| Return: |
int
| | |
| See Also: |
addColor,
Image
|
|
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|
