blob: 79fdc86ea3cd9bab43cfa52137223bfdb3d0185b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
package gjt;
import java.awt.*;
/**
* An extension of Scroller that smoothly scrolls an Image.<p>
*
* An Image must be supplied at construction time. The image
* may be reset any time after construction.<p>
*
* @version 1.0, Apr 1 1996
* @author David Geary
* @see Scroller
* @see ImageCanvas
* @see gjt.test.ScrollerTest
*/
public class ImageScroller extends Scroller {
private Image image;
private ScrollerImageCanvas canvas;
public ImageScroller(Image image) {
viewport.setLayout(new BorderLayout());
setImage(image);
}
public void resetImage(Image image) {
viewport.remove(canvas);
setImage(image);
invalidate();
validate();
}
public void scrollTo(int x, int y) {
Graphics g = canvas.getGraphics();
if(g != null) {
g.translate(-x,-y);
g.drawImage(image, 0, 0, this);
}
}
public Dimension getScrollAreaSize() {
return new Dimension(image.getWidth(this),
image.getHeight(this));
}
private void setImage(Image image) {
this.image = image;
hbar.setValue(0);
vbar.setValue(0);
viewport.add("Center",
canvas = new ScrollerImageCanvas(this, image));
}
}
class ScrollerImageCanvas extends ImageCanvas {
private ImageScroller scroller;
public ScrollerImageCanvas(ImageScroller scroller,
Image image) {
super(image);
this.scroller = scroller;
}
public void paint(Graphics g) {
scroller.repaint();
}
}
|
