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// Usage:
// tree = new TreeView()
//
// add top level items with
// tree.top.append(new TreeViewItem(nil, "name", [obj]))
// the obj is an optional argument and obj.selected(tree, currentindex, this)
// will be called when the item is selected
//
// add branch items with
// new TreeViewItem(parentTreeViewItem, "name", [obj])
// or parent.append("name", [obj])
//
// map the browser with
// tree.browser("title"
//
// because of mutual internal references, call TreeView.unlink() before
// destroying the tree
begintemplate TreeViewItem
public s, saction, selected, parent, children, showing_children, browser
public show, unshow, append, str, retval, unlink
objref saction, this, parent, children, tobj
strdef s, name
proc init() {
showing_children = 0
parent = $o1
if (object_id(parent)) {
if (!object_id(parent.children)) {
parent.children = new List()
parent.str()
}
parent.children.append(this)
}
str($s2)
if (numarg() > 2) {
saction = $o3
retval = $4
}
}
proc unlink() { local i
if (object_id(children)) {
for i=0, children.count - 1 {
children.object(i).unlink()
}
}
objref tobj, parent, saction, children
}
proc append() {
tobj = new TreeViewItem(this, $s1)
if (numarg() > 1) {
tobj.saction = $o2
tobj.retval = $3
}
}
proc str() {
if (numarg() != 0) {
name = $s1
}
s = ""
str1(s, parent)
if (object_id(children) == 0) {
sprint(s, "%s%s", s, name)
}else{
sprint(s, "%s* %s", s, name)
}
}
proc str1() {
if (object_id($o2) != 0) {
sprint($s1, " %s", $s1)
str1($s1, $o2.parent)
}
}
// TreeViewItem.selected(the tree view list, item number of tree view list)
// The action is executed only if showing_children transitions from 0 to 1
// A showing_children transition from 0 to 1 causes the children to be
// displayed. A transition from 1 to 0 causes the children to be undisplayed
proc selected() {local pos
// here is how an action can change the selection string
//sprint(s, "%s x", s)
//$o1.remove($2)
//$o1.insrt($2,this)
//$o1.select($2)
pos = $o1.scroll_pos
if (object_id(children)) {
if (showing_children == 0) {
showing_children = 1
show($o1, $2, 1)
$o1.select(-1)
$o1.select($2)
if (object_id(saction)) {
saction.selected($o1, $2, this, retval)
}
}else{
unshow($o1, $2, 1)
showing_children = 0
$o1.select($2)
if (object_id(saction)) {
saction.selected($o1, $2, this, retval)
}
}
}else{
if (object_id(saction)) {
saction.selected($o1, $2, this, retval)
}
}
$o1.scroll_pos(pos)
}
// TreeViewItem.show(treeview list, item, is root of show)
proc show() {local i
if (object_id(children) && showing_children) {
for (i = children.count - 1; i >= 0; i -= 1) {
children.object(i).show($o1, $2, 0)
}
}
if ($3 == 0) {
$o1.insrt($2+1, this)
}
}
// TreeViewItem.unshow(treeview list, item, is root of unshow)
proc unshow() {local i
if (object_id(children) && showing_children) {
for i = 0, children.count - 1 {
children.object(i).unshow($o1, $2+1, 0)
}
}
if ($3 == 0) {
$o1.remove($2)
}
}
endtemplate TreeViewItem
begintemplate TreeView
public top, browser, before, after, unlink
objref top, before, after
proc init() {
top = new List()
}
proc unlink() { local i
for i=0, top.count -1 {
top.object(i).unlink()
}
objref top, before, after
}
proc browser() {
top.browser($s1, "s")
top.select_action("action(hoc_ac_)", 1)
}
proc action() {
if ($1 > 0) { // avoid bug about always first selecting 0
if (object_id(before)) {
before.selected(0, $1)
}
top.object($1).selected(top, $1)
if (object_id(after)) {
after.selected(1, $1)
}
}
}
endtemplate TreeView
/*
// test of TreeView
objref tree, nil, tobj
proc add() {local i
for i=0, 5 {
sprint(tstr, "item %d level %d", i, $1)
tobj = new TreeViewItem($o2, tstr)
}
if ($1 < 4) {
for i=0, $o2.children.count-1 {
add($1+1, $o2.children.object(i))
}
}
}
proc test() {local i, level
tree = new TreeView()
tree.top.append(new TreeViewItem(nil, ""))
for i= 1, 5 {
sprint(tstr, "item %d top", i)
tree.top.append(new TreeViewItem(nil, tstr))
}
for i = 1, tree.top.count-1 {
add(1, tree.top.object(i))
}
tree.browser("test")
}
test()
*/
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