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161 lines
4.6 KiB
161 lines
4.6 KiB
// TODO: turn Stack into a Mixin?
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/**
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* @constructor Stack
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* Stacks items on top of each other.
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* @param {ItemSet} itemset
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* @param {Object} [options]
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*/
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function Stack (itemset, options) {
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this.itemset = itemset;
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this.options = options || {};
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this.defaultOptions = {
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order: function (a, b) {
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// Order: ranges over non-ranges, ranged ordered by width,
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// and non-ranges ordered by start.
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if (a instanceof ItemRange) {
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if (b instanceof ItemRange) {
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var aInt = (a.data.end - a.data.start);
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var bInt = (b.data.end - b.data.start);
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return (aInt - bInt) || (a.data.start - b.data.start);
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}
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else {
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return -1;
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}
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}
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else {
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if (b instanceof ItemRange) {
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return 1;
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}
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else {
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if (!a.data) {
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throw new Error('hu')
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}
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return (a.data.start - b.data.start);
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}
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}
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},
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margin: {
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item: 10
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}
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};
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this.ordered = []; // ordered items
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}
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/**
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* Set options for the stack
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* @param {Object} options Available options:
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* {ItemSet} itemset
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* {Number} margin
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* {function} order Stacking order
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*/
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Stack.prototype.setOptions = function setOptions (options) {
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util.extend(this.options, options);
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// TODO: register on data changes at the connected itemset, and update the changed part only and immediately
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};
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/**
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* Order a map with items
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* @param {Object<String, Item>} items
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* @return {Item[]} sorted items
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*/
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Stack.prototype.order = function order(items) {
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var ordered = [];
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// convert map to array
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for (var id in items) {
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if (items.hasOwnProperty(id)) ordered.push(items[id]);
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}
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//order the items
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var order = this.options.order || this.defaultOptions.order;
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if (!(typeof order === 'function')) {
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throw new Error('Option order must be a function');
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}
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ordered.sort(order);
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return ordered;
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};
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/**
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* Adjust vertical positions of the events such that they don't overlap each
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* other.
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* @param {Item[]} items All visible items
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* @private
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*/
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Stack.prototype.stack = function stack (items) {
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var i,
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iMax,
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options = this.options,
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orientation = options.orientation || this.defaultOptions.orientation,
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axisOnTop = (orientation == 'top'),
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margin,
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parentHeight = this.itemset.height;
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if (options.margin && options.margin.item !== undefined) {
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margin = options.margin.item;
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}
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else {
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margin = this.defaultOptions.margin.item
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}
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// calculate new, non-overlapping positions
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for (i = 0, iMax = items.length; i < iMax; i++) {
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var item = items[i];
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if (item.top === null) {
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// initialize top position
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if (axisOnTop) {
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item.top = margin;
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}
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else {
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// default or 'bottom'
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item.top = parentHeight - item.height - 2 * margin;
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}
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do {
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// TODO: optimize checking for overlap. when there is a gap without items,
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// you only need to check for items from the next item on, not from zero
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var collidingItem = null;
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for (var j = 0, jj = items.length; j < jj; j++) {
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var other = items[j];
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if (other.top !== null && other !== item && this.collision(item, other, margin)) {
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collidingItem = other;
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break;
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}
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}
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if (collidingItem != null) {
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// There is a collision. Reposition the event above the colliding element
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if (axisOnTop) {
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item.top = collidingItem.top + collidingItem.height + margin;
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}
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else {
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item.top = collidingItem.top - item.height - margin;
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}
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}
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} while (collidingItem);
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}
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}
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};
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/**
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* Test if the two provided items collide
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* The items must have parameters left, width, top, and height.
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* @param {Component} a The first item
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* @param {Component} b The second item
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* @param {Number} margin A minimum required margin.
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* If margin is provided, the two items will be
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* marked colliding when they overlap or
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* when the margin between the two is smaller than
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* the requested margin.
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* @return {boolean} true if a and b collide, else false
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*/
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Stack.prototype.collision = function collision (a, b, margin) {
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return ((a.left - margin) < (b.left + b.width) &&
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(a.left + a.width + margin) > b.left &&
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(a.top - margin) < (b.top + b.height) &&
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(a.top + a.height + margin) > b.top);
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};
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