[ramka001]

Hi all,

I am trying to do a scrolling menu for my canvas using the series 40 sdk. Is it possible? Please help.


Thank you in advance.

Cheers,

Ram Kumar

[aspaans]

I assume you're writing the menu entirely from scratch (using Canvas and Graphics methods). Here is a scrolling example I wrote and use, where smOffscreenOutputImg is the image i write to, containing the display, and smScrollOutputImg is a temporary hidden image (intermediate buffer)

...
smGraphScroll = smScrollOutputImg.getGraphics();
smGraphOffscreen = smOffscreenOutputImg.getGraphics();
...
...
// negative value fo yPixels when scrolling down.
private static void scrollUp(int yPixels)
{
final int width = smOffscreenOutputImg.getWidth();
final int height = smOffscreenOutputImg.getHeight();

drawRegion(smGraphScroll, smOffscreenOutputImg,
0, yPixels, width, height - yPixels,
0, 0, Graphics.TOP | Graphics.LEFT);
drawRegion(smGraphOffscreen, smScrollOutputImg,
0, 0, width, height - yPixels,
0, 0, Graphics.TOP | Graphics.LEFT);

g.setClip(0, 0, width, height); // Remove this line for MIDP2.0

final int y = (yPixels < 0 ? 0 : height - yPixels);
g.setColor(mBackColor);
g.fillRect(0, y, width, yPixels < 0 ? -yPixels : yPixels);
}


private static void drawRegion(Graphics g, Image img,
int xSrc, int ySrc, int width, int height,
int xDst, int yDst, int anchor)
{
/** MIDP1.0 */
g.setClip(xDst, yDst, width, height);
g.drawImage(img,
xDst - xSrc,
yDst - ySrc,
anchor);
/** MIDP2.0
g.drawRegion(img,
xSrc, ySrc, width, height,
0,
xDst, yDst, anchor);
*/
}