[315] in java-interest
Re: access to container or window
daemon@ATHENA.MIT.EDU (Jonathan Payne)
Wed Jun 14 15:35:13 1995
Date: Wed, 14 Jun 1995 12:06:01 -0700
From: jpayne@starwave.com (Jonathan Payne)
To: rizzotti.sven@ch.swissbank.com
Cc: java-interest@java.sun.com
In-Reply-To: <9506141304.AA24617@chbslu01.iis.ch.swissbank.com> (message from Sven Rizzotti on Wed, 14 Jun 95 15:04:10 +0200)
Reply-To: jpayne@starwave.com
> Mime-Version: 1.0 (NeXT Mail 3.3 v118.2)
> From: Sven Rizzotti <rizzotti.sven@ch.swissbank.com>
> Date: Wed, 14 Jun 95 15:04:10 +0200
> Sender: owner-java-interest@java.sun.com
> Precedence: bulk
> X-Info: To unsubscribe, send 'unsubscribe' to java-interest-request@java.sun.com
> Content-Type: text/plain
> Content-Length: 286
>
> A lot of the classes like List, TextField etc. need a container which can be
> a form or a window. where do I get this variable from inside my applet
> subclass ?
>
> __Sven
> -
> Note to Sun employees: this is an EXTERNAL mailing list!
> Info: send 'help' to java-interest-request@java.sun.com
>
Here's a starting point (I just threw this together, didn't try to
compile it, left out a bunch of methods) for a scrolling list that you
can put inside an applet.
E.g.,
class ScrollingList extends AppComponent {
String items[] = new String[5];
int nitems = 0;
int rowsToDisplay = 10;
Font font;
int selection[] = new int[0];
public void addItem(String item) {
if (nitems >= items.length) {
String newItems[] = new String[(int) (items.length * 1.5)];
System.arraycopy(items, 0, newItems, 0, items.length);
items = newItems;
}
items[nitems++] = item;
}
public void addNotify() {
font = getFont("Helvetica", 14);
}
public void setRowsToDisplay(int n) {
rowsToDisplay = n;
}
public Dimension preferredSize() {
int width = 30; /* 30 is minimum, let's say */
for (int i = 0; i < nitems; i++)
width = Math.max(width, font.stringWidth(items[i]));
return new Dimension(width, (font.height + itemGap) * rowsToDisplay);
}
public void paint(Graphics g) {
int y = 0;
for (int i = 0; i < nitems; i++) {
/* do something for items that are selected */
g.drawString(items[i], 2, y + font.ascent);
y += font.height + itemGap;
if (y > height)
break;
}
}
public void mouseDown(int x, int y) {
item = locateItem(x, y);
if (item != -1)
selectItem(item);
}
public void selectItem(int item) {
/* code to select item */
repaint();
}
}
-
Note to Sun employees: this is an EXTERNAL mailing list!
Info: send 'help' to java-interest-request@java.sun.com
