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Changeable root position (between children - default / corner) #28

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Changeable root position (between children - default / corner) #28

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10 changes: 8 additions & 2 deletions src/flextree.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ const {version} = packageInfo;
const defaults = Object.freeze({
children: data => data.children,
nodeSize: node => node.data.size,
rootBetweenChildren: true,
spacing: 0,
});

Expand All @@ -28,6 +29,7 @@ export default function flextree(options) {
function getFlexNode() {
const nodeSize = accessor('nodeSize');
const spacing = accessor('spacing');
const rootBetweenChildren = accessor('rootBetweenChildren');
return class FlexNode extends hierarchy.prototype.constructor {
constructor(data) {
super(data);
Expand All @@ -46,6 +48,7 @@ export default function flextree(options) {
get bottom() { return this.y + this.ySize; }
get left() { return this.x - this.xSize / 2; }
get right() { return this.x + this.xSize / 2; }
get rootBetweenChildren() { return rootBetweenChildren(); }
get root() {
const ancs = this.ancestors();
return ancs[ancs.length - 1];
Expand Down Expand Up @@ -89,6 +92,7 @@ export default function flextree(options) {
const FlexNode = getFlexNode();
const nodeSize = accessor('nodeSize');
const spacing = accessor('spacing');
const rootBetweenChildren = accessor('rootBetweenChildren');
return class extends FlexNode {
constructor(data) {
super(data);
Expand All @@ -105,6 +109,7 @@ export default function flextree(options) {
set x(v) { this.data.x = v; }
get y() { return this.data.y; }
set y(v) { this.data.y = v; }
get rootBetweenChildren() { return rootBetweenChildren(); }
update() {
layoutChildren(this);
resolveX(this);
Expand Down Expand Up @@ -326,8 +331,9 @@ const positionRoot = w => {
if (w.hasChildren) {
const k0 = w.firstChild;
const kf = w.lastChild;
const prelim = (k0.prelim + k0.relX - k0.xSize / 2 +
kf.relX + kf.prelim + kf.xSize / 2 ) / 2;
const prelim = w.rootBetweenChildren
? (k0.prelim + k0.relX - k0.xSize / 2 + kf.relX + kf.prelim + kf.xSize / 2 ) / 2
: 0;
Object.assign(w, {
prelim,
lExt: k0.lExt, lExtRelX: k0.lExtRelX,
Expand Down