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git-subtree-dir: lib/gridster git-subtree-mainline:80f8419dacgit-subtree-split:a7ed9a4ade
457 lines
14 KiB
JavaScript
457 lines
14 KiB
JavaScript
/*
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* jquery.draggable
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* https://github.com/ducksboard/gridster.js
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*
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* Copyright (c) 2012 ducksboard
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* Licensed under the MIT licenses.
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*/
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;(function(root, factory) {
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'use strict';
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if(typeof exports === 'object') {
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module.exports = factory(require('jquery'));
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}
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else if (typeof define === 'function' && define.amd) {
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define('gridster-draggable', ['jquery'], factory);
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} else {
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root.GridsterDraggable = factory(root.$ || root.jQuery);
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}
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}(this, function($) {
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'use strict';
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var defaults = {
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items: 'li',
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distance: 1,
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limit: true,
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offset_left: 0,
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autoscroll: true,
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ignore_dragging: ['INPUT', 'TEXTAREA', 'SELECT', 'BUTTON'], // or function
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handle: null,
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container_width: 0, // 0 == auto
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move_element: true,
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helper: false, // or 'clone'
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remove_helper: true
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// drag: function(e) {},
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// start : function(e, ui) {},
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// stop : function(e) {}
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};
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var $window = $(window);
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var dir_map = { x : 'left', y : 'top' };
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var isTouch = !!('ontouchstart' in window);
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var capitalize = function(str) {
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return str.charAt(0).toUpperCase() + str.slice(1);
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};
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var idCounter = 0;
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var uniqId = function() {
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return ++idCounter + '';
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};
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/**
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* Basic drag implementation for DOM elements inside a container.
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* Provide start/stop/drag callbacks.
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*
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* @class Draggable
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* @param {HTMLElement} el The HTMLelement that contains all the widgets
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* to be dragged.
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* @param {Object} [options] An Object with all options you want to
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* overwrite:
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* @param {HTMLElement|String} [options.items] Define who will
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* be the draggable items. Can be a CSS Selector String or a
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* collection of HTMLElements.
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* @param {Number} [options.distance] Distance in pixels after mousedown
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* the mouse must move before dragging should start.
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* @param {Boolean} [options.limit] Constrains dragging to the width of
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* the container
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* @param {Object|Function} [options.ignore_dragging] Array of node names
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* that sould not trigger dragging, by default is `['INPUT', 'TEXTAREA',
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* 'SELECT', 'BUTTON']`. If a function is used return true to ignore dragging.
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* @param {offset_left} [options.offset_left] Offset added to the item
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* that is being dragged.
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* @param {Number} [options.drag] Executes a callback when the mouse is
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* moved during the dragging.
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* @param {Number} [options.start] Executes a callback when the drag
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* starts.
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* @param {Number} [options.stop] Executes a callback when the drag stops.
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* @return {Object} Returns `el`.
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* @constructor
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*/
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function Draggable(el, options) {
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this.options = $.extend({}, defaults, options);
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this.$document = $(document);
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this.$container = $(el);
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this.$scroll_container = this.options.scroll_container === window ?
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$(window) : this.$container.closest(this.options.scroll_container);
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this.is_dragging = false;
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this.player_min_left = 0 + this.options.offset_left;
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this.id = uniqId();
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this.ns = '.gridster-draggable-' + this.id;
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this.init();
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}
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Draggable.defaults = defaults;
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var fn = Draggable.prototype;
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fn.init = function() {
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var pos = this.$container.css('position');
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this.calculate_dimensions();
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this.$container.css('position', pos === 'static' ? 'relative' : pos);
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this.disabled = false;
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this.events();
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$window.bind(this.nsEvent('resize'),
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throttle($.proxy(this.calculate_dimensions, this), 200));
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};
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fn.nsEvent = function(ev) {
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return (ev || '') + this.ns;
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};
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fn.events = function() {
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this.pointer_events = {
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start: this.nsEvent('touchstart') + ' ' + this.nsEvent('mousedown'),
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move: this.nsEvent('touchmove') + ' ' + this.nsEvent('mousemove'),
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end: this.nsEvent('touchend') + ' ' + this.nsEvent('mouseup')
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};
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this.$container.on(this.nsEvent('selectstart'),
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$.proxy(this.on_select_start, this));
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this.$container.on(this.pointer_events.start, this.options.items,
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$.proxy(this.drag_handler, this));
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this.$document.on(this.pointer_events.end, $.proxy(function(e) {
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this.is_dragging = false;
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if (this.disabled) { return; }
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this.$document.off(this.pointer_events.move);
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if (this.drag_start) {
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this.on_dragstop(e);
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}
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}, this));
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};
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fn.get_actual_pos = function($el) {
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return $el.position();
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};
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fn.get_mouse_pos = function(e) {
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if (e.originalEvent && e.originalEvent.touches) {
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var oe = e.originalEvent;
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e = oe.touches.length ? oe.touches[0] : oe.changedTouches[0];
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}
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return {
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left: e.clientX,
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top: e.clientY
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};
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};
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fn.get_offset = function(e) {
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e.preventDefault();
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var mouse_actual_pos = this.get_mouse_pos(e);
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var diff_x = Math.round(
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mouse_actual_pos.left - this.mouse_init_pos.left);
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var diff_y = Math.round(mouse_actual_pos.top - this.mouse_init_pos.top);
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var left = Math.round(this.el_init_offset.left +
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diff_x - this.baseX +
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this.$scroll_container.scrollLeft() -
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this.scroll_container_offset_x);
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var top = Math.round(this.el_init_offset.top +
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diff_y - this.baseY +
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this.$scroll_container.scrollTop() -
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this.scroll_container_offset_y);
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if (this.options.limit) {
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if (left > this.player_max_left) {
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left = this.player_max_left;
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} else if(left < this.player_min_left) {
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left = this.player_min_left;
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}
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}
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return {
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position: {
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left: left,
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top: top
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},
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pointer: {
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left: mouse_actual_pos.left,
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top: mouse_actual_pos.top,
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diff_left: diff_x + (this.$scroll_container.scrollLeft() -
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this.scroll_container_offset_x),
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diff_top: diff_y + (this.$scroll_container.scrollTop() -
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this.scroll_container_offset_y)
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}
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};
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};
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fn.get_drag_data = function(e) {
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var offset = this.get_offset(e);
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offset.$player = this.$player;
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offset.$helper = this.helper ? this.$helper : this.$player;
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return offset;
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};
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fn.set_limits = function(container_width) {
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container_width || (container_width = this.$container.width());
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this.player_max_left = (container_width - this.player_width +
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- this.options.offset_left);
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this.options.container_width = container_width;
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return this;
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};
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fn.scroll_in = function(axis, data) {
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var dir_prop = dir_map[axis];
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var area_size = 50;
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var scroll_inc = 30;
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var scrollDir = 'scroll' + capitalize(dir_prop);
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var is_x = axis === 'x';
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var scroller_size = is_x ? this.scroller_width : this.scroller_height;
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var doc_size;
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if (this.$scroll_container === window){
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doc_size = is_x ? this.$scroll_container.width() :
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this.$scroll_container.height();
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}else{
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doc_size = is_x ? this.$scroll_container[0].scrollWidth :
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this.$scroll_container[0].scrollHeight;
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}
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var player_size = is_x ? this.$player.width() : this.$player.height();
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var next_scroll;
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var scroll_offset = this.$scroll_container[scrollDir]();
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var min_scroll_pos = scroll_offset;
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var max_scroll_pos = min_scroll_pos + scroller_size;
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var mouse_next_zone = max_scroll_pos - area_size; // down/right
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var mouse_prev_zone = min_scroll_pos + area_size; // up/left
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var abs_mouse_pos = min_scroll_pos + data.pointer[dir_prop];
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var max_player_pos = (doc_size - scroller_size + player_size);
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if (abs_mouse_pos >= mouse_next_zone) {
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next_scroll = scroll_offset + scroll_inc;
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if (next_scroll < max_player_pos) {
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this.$scroll_container[scrollDir](next_scroll);
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this['scroll_offset_' + axis] += scroll_inc;
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}
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}
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if (abs_mouse_pos <= mouse_prev_zone) {
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next_scroll = scroll_offset - scroll_inc;
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if (next_scroll > 0) {
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this.$scroll_container[scrollDir](next_scroll);
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this['scroll_offset_' + axis] -= scroll_inc;
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}
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}
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return this;
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};
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fn.manage_scroll = function(data) {
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this.scroll_in('x', data);
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this.scroll_in('y', data);
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};
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fn.calculate_dimensions = function() {
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this.scroller_height = this.$scroll_container.height();
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this.scroller_width = this.$scroll_container.width();
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};
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fn.drag_handler = function(e) {
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// skip if drag is disabled, or click was not done with the mouse primary button
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if (this.disabled || e.which !== 1 && !isTouch) {
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return;
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}
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if (this.ignore_drag(e)) {
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return;
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}
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var self = this;
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var first = true;
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this.$player = $(e.currentTarget);
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this.el_init_pos = this.get_actual_pos(this.$player);
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this.mouse_init_pos = this.get_mouse_pos(e);
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this.offsetY = this.mouse_init_pos.top - this.el_init_pos.top;
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this.$document.on(this.pointer_events.move, function(mme) {
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var mouse_actual_pos = self.get_mouse_pos(mme);
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var diff_x = Math.abs(
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mouse_actual_pos.left - self.mouse_init_pos.left);
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var diff_y = Math.abs(
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mouse_actual_pos.top - self.mouse_init_pos.top);
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if (!(diff_x > self.options.distance ||
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diff_y > self.options.distance)
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) {
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return false;
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}
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if (first) {
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first = false;
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self.on_dragstart.call(self, mme);
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return false;
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}
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if (self.is_dragging === true) {
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self.on_dragmove.call(self, mme);
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}
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return false;
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});
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if (!isTouch) { return false; }
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};
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fn.on_dragstart = function(e) {
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e.preventDefault();
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if (this.is_dragging) { return this; }
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this.drag_start = this.is_dragging = true;
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var offset = this.$container.offset();
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this.baseX = Math.round(offset.left);
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this.baseY = Math.round(offset.top);
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if (this.options.helper === 'clone') {
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this.$helper = this.$player.clone()
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.appendTo(this.$container).addClass('helper');
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this.helper = true;
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} else {
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this.helper = false;
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}
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this.scroll_container_offset_y = this.$scroll_container.scrollTop();
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this.scroll_container_offset_x = this.$scroll_container.scrollLeft();
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this.el_init_offset = this.$player.offset();
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this.player_width = this.$player.width();
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this.set_limits(this.options.container_width);
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if (this.options.start) {
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this.options.start.call(this.$player, e, this.get_drag_data(e));
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}
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return false;
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};
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fn.on_dragmove = function(e) {
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var data = this.get_drag_data(e);
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this.options.autoscroll && this.manage_scroll(data);
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if (this.options.move_element) {
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(this.helper ? this.$helper : this.$player).css({
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'position': 'absolute',
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'left' : data.position.left,
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'top' : data.position.top
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});
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}
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var last_position = this.last_position || data.position;
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data.prev_position = last_position;
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if (this.options.drag) {
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this.options.drag.call(this.$player, e, data);
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}
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this.last_position = data.position;
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return false;
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};
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fn.on_dragstop = function(e) {
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var data = this.get_drag_data(e);
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this.drag_start = false;
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if (this.options.stop) {
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this.options.stop.call(this.$player, e, data);
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}
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if (this.helper && this.options.remove_helper) {
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this.$helper.remove();
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}
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return false;
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};
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fn.on_select_start = function(e) {
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if (this.disabled) { return; }
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if (this.ignore_drag(e)) {
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return;
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}
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return false;
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};
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fn.enable = function() {
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this.disabled = false;
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};
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fn.disable = function() {
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this.disabled = true;
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};
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fn.destroy = function() {
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this.disable();
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this.$container.off(this.ns);
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this.$document.off(this.ns);
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$window.off(this.ns);
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$.removeData(this.$container, 'drag');
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};
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fn.ignore_drag = function(event) {
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if (this.options.handle) {
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return !$(event.target).is(this.options.handle);
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}
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if ($.isFunction(this.options.ignore_dragging)) {
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return this.options.ignore_dragging(event);
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}
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if (this.options.resize) {
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return ! $(event.target).is(this.options.items);
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}
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return $(event.target).is(this.options.ignore_dragging.join(', '));
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};
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//jQuery adapter
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$.fn.gridDraggable = function ( options ) {
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return new Draggable(this, options);
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};
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$.fn.dragg = function (options) {
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return this.each(function () {
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if (!$.data(this, 'drag')) {
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$.data(this, 'drag', new Draggable(this, options));
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}
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});
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};
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return Draggable;
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}));
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