treeoutline.js

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        this.identifier = TreeOutline._knownTreeElementNextIdentifier++;
        this.representedObject.__treeElementIdentifier = this.identifier;
    }

    this._hidden = false;
    this.expanded = false;
    this.selected = false;
    this.hasChildren = hasChildren;
    this.children = [];
    this.treeOutline = null;
    this.parent = null;
    this.previousSibling = null;
    this.nextSibling = null;
    this._listItemNode = null;
}

TreeElement.prototype = {
    selectable: true,
    arrowToggleWidth: 10,

    get listItemElement() {
        return this._listItemNode;
    },

    get childrenListElement() {
        return this._childrenListNode;
    },

    get title() {
        return this._title;
    },

    set title(x) {
        this._title = x;
        if (this._listItemNode)
            this._listItemNode.innerHTML = x;
    },

    get tooltip() {
        return this._tooltip;
    },

    set tooltip(x) {
        this._tooltip = x;
        if (this._listItemNode)
            this._listItemNode.title = x ? x : "";
    },

    get hasChildren() {
        return this._hasChildren;
    },

    set hasChildren(x) {
        if (this._hasChildren === x)
            return;

        this._hasChildren = x;

        if (!this._listItemNode)
            return;

        if (x)
            this._listItemNode.addStyleClass("parent");
        else {
            this._listItemNode.removeStyleClass("parent");
            this.collapse();
        }
    },

    get hidden() {
        return this._hidden;
    },

    set hidden(x) {
        if (this._hidden === x)
            return;

        this._hidden = x;

        if (x) {
            if (this._listItemNode)
                this._listItemNode.addStyleClass("hidden");
            if (this._childrenListNode)
                this._childrenListNode.addStyleClass("hidden");
        } else {
            if (this._listItemNode)
                this._listItemNode.removeStyleClass("hidden");
            if (this._childrenListNode)
                this._childrenListNode.removeStyleClass("hidden");
        }
    },

    get shouldRefreshChildren() {
        return this._shouldRefreshChildren;
    },

    set shouldRefreshChildren(x) {
        this._shouldRefreshChildren = x;
        if (x && this.expanded)
            this.expand();
    }
}

TreeElement.prototype.appendChild = TreeOutline._appendChild;
TreeElement.prototype.insertChild = TreeOutline._insertChild;
TreeElement.prototype.removeChild = TreeOutline._removeChild;
TreeElement.prototype.removeChildAtIndex = TreeOutline._removeChildAtIndex;
TreeElement.prototype.removeChildren = TreeOutline._removeChildren;
TreeElement.prototype.removeChildrenRecursive = TreeOutline._removeChildrenRecursive;

TreeElement.prototype._attach = function()
{
    if (!this._listItemNode || this.parent._shouldRefreshChildren) {
        if (this._listItemNode && this._listItemNode.parentNode)
            this._listItemNode.parentNode.removeChild(this._listItemNode);

        this._listItemNode = this.treeOutline._childrenListNode.ownerDocument.createElement("li");
        this._listItemNode.treeElement = this;
        this._listItemNode.innerHTML = this._title;
        this._listItemNode.title = this._tooltip ? this._tooltip : "";

        if (this.hidden)
            this._listItemNode.addStyleClass("hidden");
        if (this.hasChildren)
            this._listItemNode.addStyleClass("parent");
        if (this.expanded)
            this._listItemNode.addStyleClass("expanded");
        if (this.selected)
            this._listItemNode.addStyleClass("selected");

        this._listItemNode.addEventListener("mousedown", TreeElement.treeElementSelected, false);
        this._listItemNode.addEventListener("click", TreeElement.treeElementToggled, false);
        this._listItemNode.addEventListener("dblclick", TreeElement.treeElementDoubleClicked, false);

        if (this.onattach)
            this.onattach(this);
    }

    var nextSibling = null;
    if (this.nextSibling && this.nextSibling._listItemNode && this.nextSibling._listItemNode.parentNode === this.parent._childrenListNode)
        nextSibling = this.nextSibling._listItemNode;
    this.parent._childrenListNode.insertBefore(this._listItemNode, nextSibling);
    if (this._childrenListNode)
        this.parent._childrenListNode.insertBefore(this._childrenListNode, this._listItemNode.nextSibling);
    if (this.selected)
        this.select();
    if (this.expanded)
        this.expand();
}

TreeElement.prototype._detach = function()
{
    if (this._listItemNode && this._listItemNode.parentNode)
        this._listItemNode.parentNode.removeChild(this._listItemNode);
    if (this._childrenListNode && this._childrenListNode.parentNode)
        this._childrenListNode.parentNode.removeChild(this._childrenListNode);
}

TreeElement.treeElementSelected = function(event)
{
    var element = event.currentTarget;
    if (!element || !element.treeElement || !element.treeElement.selectable)
        return;

    if (element.treeElement.isEventWithinDisclosureTriangle(event))
        return;

    element.treeElement.select();
}

TreeElement.treeElementToggled = function(event)
{
    var element = event.currentTarget;
    if (!element || !element.treeElement)
        return;

    if (!element.treeElement.isEventWithinDisclosureTriangle(event))
        return;

    if (element.treeElement.expanded) {
        if (event.altKey)
            element.treeElement.collapseRecursively();
        else
            element.treeElement.collapse();
    } else {
        if (event.altKey)
            element.treeElement.expandRecursively();
        else
            element.treeElement.expand();
    }
}

TreeElement.treeElementDoubleClicked = function(event)
{
    var element = event.currentTarget;
    if (!element || !element.treeElement)
        return;

    if (element.treeElement.ondblclick)
        element.treeElement.ondblclick(element.treeElement, event);
    else if (element.treeElement.hasChildren && !element.treeElement.expanded)
        element.treeElement.expand();
}

TreeElement.prototype.collapse = function()
{
    if (this._listItemNode)
        this._listItemNode.removeStyleClass("expanded");
    if (this._childrenListNode)
        this._childrenListNode.removeStyleClass("expanded");

    this.expanded = false;
    if (this.treeOutline)
        this.treeOutline._treeElementsExpandedState[this.identifier] = true;

    if (this.oncollapse)
        this.oncollapse(this);
}

TreeElement.prototype.collapseRecursively = function()
{
    var item = this;
    while (item) {
        if (item.expanded)
            item.collapse();
        item = item.traverseNextTreeElement(false, this, true);
    }
}

TreeElement.prototype.expand = function()
{
    if (!this.hasChildren || (this.expanded && !this._shouldRefreshChildren && this._childrenListNode))
        return;

    if (this.treeOutline && (!this._childrenListNode || this._shouldRefreshChildren)) {
        if (this._childrenListNode && this._childrenListNode.parentNode)
            this._childrenListNode.parentNode.removeChild(this._childrenListNode);

        this._childrenListNode = this.treeOutline._childrenListNode.ownerDocument.createElement("ol");
        this._childrenListNode.parentTreeElement = this;
        this._childrenListNode.addStyleClass("children");

        if (this.hidden)
            this._childrenListNode.addStyleClass("hidden");

        if (this.onpopulate)
            this.onpopulate(this);

        for (var i = 0; i < this.children.length; ++i)
            this.children[i]._attach();

        delete this._shouldRefreshChildren;
    }

    if (this._listItemNode) {
        this._listItemNode.addStyleClass("expanded");
        if (this._childrenListNode && this._childrenListNode.parentNode != this._listItemNode.parentNode)
            this.parent._childrenListNode.insertBefore(this._childrenListNode, this._listItemNode.nextSibling);
    }

    if (this._childrenListNode)
        this._childrenListNode.addStyleClass("expanded");

    this.expanded = true;
    if (this.treeOutline)
        this.treeOutline._treeElementsExpandedState[this.identifier] = true;

    if (this.onexpand)
        this.onexpand(this);
}

TreeElement.prototype.expandRecursively = function(maxDepth)
{
    var item = this;
    var info = {};
    var depth = 0;

    // The Inspector uses TreeOutlines to represents object properties, so recursive expansion
    // in some case can be infinite, since JavaScript objects can hold circular references.
    // So default to a recursion cap of 3 levels, since that gives fairly good results.
    if (typeof maxDepth === "undefined" || typeof maxDepth === "null")
        maxDepth = 3;

    while (item) {
        if (depth < maxDepth)
            item.expand();
        item = item.traverseNextTreeElement(false, this, (depth >= maxDepth), info);
        depth += info.depthChange;
    }
}

TreeElement.prototype.hasAncestor = function(ancestor) {
    if (!ancestor)
        return false;

    var currentNode = this.parent;
    while (currentNode) {
        if (ancestor === currentNode)
            return true;
        currentNode = currentNode.parent;
    }

    return false;
}

TreeElement.prototype.reveal = function()
{
    var currentAncestor = this.parent;
    while (currentAncestor && !currentAncestor.root) {
        if (!currentAncestor.expanded)
            currentAncestor.expand();
        currentAncestor = currentAncestor.parent;
    }

    if (this.onreveal)
        this.onreveal(this);
}

TreeElement.prototype.revealed = function()
{
    var currentAncestor = this.parent;
    while (currentAncestor && !currentAncestor.root) {
        if (!currentAncestor.expanded)
            return false;
        currentAncestor = currentAncestor.parent;
    }

    return true;
}

TreeElement.prototype.select = function(supressOnSelect)
{
    if (!this.treeOutline || !this.selectable || this.selected)
        return;

    if (this.treeOutline.selectedTreeElement)
        this.treeOutline.selectedTreeElement.deselect();

    this.selected = true;
    this.treeOutline.selectedTreeElement = this;
    if (this._listItemNode)
        this._listItemNode.addStyleClass("selected");

    if (this.onselect && !supressOnSelect)
        this.onselect(this);
}

TreeElement.prototype.deselect = function(supressOnDeselect)
{
    if (!this.treeOutline || this.treeOutline.selectedTreeElement !== this || !this.selected)
        return;

    this.selected = false;
    this.treeOutline.selectedTreeElement = null;
    if (this._listItemNode)
        this._listItemNode.removeStyleClass("selected");

    if (this.ondeselect && !supressOnDeselect)
        this.ondeselect(this);
}

TreeElement.prototype.traverseNextTreeElement = function(skipHidden, stayWithin, dontPopulate, info)
{
    if (!dontPopulate && this.hasChildren && this.onpopulate)
        this.onpopulate(this);

    if (info)
        info.depthChange = 0;

    var element = skipHidden ? (this.revealed() ? this.children[0] : null) : this.children[0];
    if (element && (!skipHidden || (skipHidden && this.expanded))) {
        if (info)
            info.depthChange = 1;
        return element;
    }

    if (this === stayWithin)
        return null;

    element = skipHidden ? (this.revealed() ? this.nextSibling : null) : this.nextSibling;
    if (element)
        return element;

    element = this;
    while (element && !element.root && !(skipHidden ? (element.revealed() ? element.nextSibling : null) : element.nextSibling) && element.parent !== stayWithin) {
        if (info)
            info.depthChange -= 1;
        element = element.parent;
    }

    if (!element)
        return null;

    return (skipHidden ? (element.revealed() ? element.nextSibling : null) : element.nextSibling);
}

TreeElement.prototype.traversePreviousTreeElement = function(skipHidden, dontPopulate)
{
    var element = skipHidden ? (this.revealed() ? this.previousSibling : null) : this.previousSibling;
    if (!dontPopulate && element && element.hasChildren && element.onpopulate)
        element.onpopulate(element);

    while (element && (skipHidden ? (element.revealed() && element.expanded ? element.children[element.children.length - 1] : null) : element.children[element.children.length - 1])) {
        if (!dontPopulate && element.hasChildren && element.onpopulate)
            element.onpopulate(element);
        element = (skipHidden ? (element.revealed() && element.expanded ? element.children[element.children.length - 1] : null) : element.children[element.children.length - 1]);
    }

    if (element)
        return element;

    if (!this.parent || this.parent.root)
        return null;

    return this.parent;
}

TreeElement.prototype.isEventWithinDisclosureTriangle = function(event)
{
    var left = this._listItemNode.totalOffsetLeft;
    return event.pageX >= left && event.pageX <= left + this.arrowToggleWidth && this.hasChildren;
}