Oops, didn't paste all of the code in from my text editor. Here is more:
public class PagedTreeNode extends TreeNodeBase {
private List<PagedTreeNode> children = new ArrayList<PagedTreeNode>();
private List<PagedTreeNode> visibleChildren = new ArrayList<PagedTreeNode>();
private int startAt = 0;
private int pageSize = 20;
private void initVisibleChildren() {
visibleChildren.clear();
int size = children.size();
if (startAt >= size) {
startAt = size - 1;
}
if (size <= pageSize) {
visibleChildren.addAll(children);
} else {
if (startAt < 0) {
// TODO: add page up node
}
int numChildren = Math.min(pageSize, size - startAt);
visibleChildren.addAll(children.subList(startAt, numChildren));
if (startAt + pageSize < size) {
// TODO: add page down node
}
}
}
public void scrollUp() {
startAt = Math.max(0, startAt - pageSize);
initVisibleChildren();
}
public void scrollDown() {
startAt = Math.min(children.size - 1, startAt + pageSize);
initVisibleChildren();
}
public void addChildren(PagedTreeNode... nodes) {
for (PagedTreeNode node : nodes) {
children.add(node);
}
initVisibleChildren();
}
public void removeChildren(PagedTreeNode... nodes) {
for (PagedTreeNode node : nodes) {
children.remove(node);
}
initVisibleChildren();
}
public List<PagedTreeNode> getAllChildren() {
return Collections.unmodifiableList(children);
}
@Override public List<PagedTreeNode> getChildren() {
return visibleChildren;
}
}
On 8/3/07, Andrew Robinson <[EMAIL PROTECTED]> wrote:
> Yes it is feasible with tree2 and I have done it, but it is not very
> easy. The source is proprietary so I can't help you out, but you can
> do it.
>
> You have do dig into the tree2 code and understand it to really get it
> to work well as some of the functionality you have to use, you will
> not find it in the documentation. If you want AJAX, I would suggest
> using an AJAX'd tree and not the tree2 (tree2 is not very AJAX
> friendly for updating portions of the tree). Tree2 is fine if you
> don't mind re-rendering the entire tree though.
>
> What you can do:
>
> Write custom tree nodes. Replace the List of children with a custom
> list. You can have a static variable or a per-node variable for the
> maximum children you want to display. You want to have 2 children
> collections (either 2 physical or 1 physical, 1 virtual).
>
> Just like the UIData, you will want to store the "start at" index for
> the children.
>
> Then you need to create 1 or 2 fake children nodes. These will be your
> "page up" and "page down" nodes. If the "start at" is 0, you don't add
> the "page up", and if the start at is # of children + 1 + number of
> displayed nodes, then don't display the page down.
>
> Put in a node selection listener. If the user selects either a page up
> or page down node, simple increment or decrement the start at.
>
> Here is an extremely simple example (just to give you an idea, it is
> not complete at all). Also I just wrote this in the email, so sorry if
> functions are not correct:
>
> public class PagedTreeNode extends TreeNodeBase {
> private List<PagedTreeNode> children = new ArrayList<PagedTreeNode>();
> private List<PagedTreeNode> visibleChildren = new
> ArrayList<PagedTreeNode>();
> private int startAt = 0;
> private int pageSize = 20;
>
> private void initVisibleChildren() {
> visibleChildren.clear();
> int size = children.size();
> if (startAt >= size) {
> startAt = size - 1;
> }
> if (size <= pageSize) {
> visibleChildren.addAll(children);
> } else {
> if (startAt < 0) {
> // TODO: add page up node
> }
> int numChildren = Math.min(pageSize, size - startAt);
> visibleChildren.addAll(children.subList(startAt, numChildren));
> if (startAt + pageSize < size) {
> // TODO: add page down node
> }
> }
> }
> }
>
> Then you just need to write the code to check to see if the node that
> is selected is a page up/down node an call the appropriate function on
> the parent node.
>
> -Andrew
>
>
> On 8/3/07, kewldude <[EMAIL PROTECTED]> wrote:
> >
> > Has anyone here tried to implement a tree2 component that is scrollable?
> > Meaning lets say you have to display 100 nodes with 10 nodes per page (10
> > nodes are visible at any given time), then above the tree2 component you
> > have something like a scroller, so you can traverse the tree and display
> > each nodes(10 per each page) by clicking on the scroller? Feasible?
> > --
> > View this message in context:
> > http://www.nabble.com/Scrollable-Tree2-tf4212632.html#a11983598
> > Sent from the MyFaces - Users mailing list archive at Nabble.com.
> >
> >
>
