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This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle. If not, see <http://www.gnu.org/licenses/>.\n\n/*\n * JavaScript to handle drag operations, including automatic scrolling.\n *\n * Note: this module is defined statically. It is a singleton. You\n * can only have one use of it active at any time. However, you\n * can only drag one thing at a time, this is not a problem in practice.\n *\n * @module core/dragdrop\n * @class dragdrop\n * @package core\n * @copyright 2016 The Open University\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n * @since 3.6\n */\ndefine(['jquery', 'core/autoscroll'], function($, autoScroll) {\n /**\n * @alias module:core/dragdrop\n */\n var dragdrop = {\n /**\n * A boolean or options argument depending on whether browser supports passive events.\n * @private\n */\n eventCaptureOptions: {passive: false, capture: true},\n\n /**\n * Drag proxy if any.\n * @private\n */\n dragProxy: null,\n\n /**\n * Function called on move.\n * @private\n */\n onMove: null,\n\n /**\n * Function called on drop.\n * @private\n */\n onDrop: null,\n\n /**\n * Initial position of proxy at drag start.\n */\n initialPosition: null,\n\n /**\n * Initial page X of cursor at drag start.\n */\n initialX: null,\n\n /**\n * Initial page Y of cursor at drag start.\n */\n initialY: null,\n\n /**\n * If touch event is in progress, this will be the id, otherwise null\n */\n touching: null,\n\n /**\n * Prepares to begin a drag operation - call with a mousedown or touchstart event.\n *\n * If the returned object has 'start' true, then you can set up a drag proxy, and call\n * start. This function will call preventDefault automatically regardless of whether\n * starting or not.\n *\n * @public\n * @param {Object} event Event (should be either mousedown or touchstart)\n * @return {Object} Object with start (boolean flag) and x, y (only if flag true) values\n */\n prepare: function(event) {\n event.preventDefault();\n var start;\n if (event.type === 'touchstart') {\n // For touch, start if there's at least one touch and we are not currently doing\n // a touch event.\n start = (dragdrop.touching === null) && event.changedTouches.length > 0;\n } else {\n // For mousedown, start if it's the left button.\n start = event.which === 1;\n }\n if (start) {\n var details = dragdrop.getEventXY(event);\n details.start = true;\n return details;\n } else {\n return {start: false};\n }\n },\n\n /**\n * Call to start a drag operation, in response to a mouse down or touch start event.\n * Normally call this after calling prepare and receiving start true (you can probably\n * skip prepare if only supporting drag not touch).\n *\n * Note: The caller is responsible for creating a 'drag proxy' which is the\n * thing that actually gets dragged. At present, this doesn't really work\n * properly unless it is added directly within the body tag.\n *\n * You also need to ensure that there is CSS so the proxy is absolutely positioned,\n * and styled to look like it is floating.\n *\n * You also need to absolutely position the proxy where you want it to start.\n *\n * @public\n * @param {Object} event Event (should be either mousedown or touchstart)\n * @param {jQuery} dragProxy An absolute-positioned element for dragging\n * @param {Object} onMove Function that receives X and Y page locations for a move\n * @param {Object} onDrop Function that receives X and Y page locations when dropped\n */\n start: function(event, dragProxy, onMove, onDrop) {\n var xy = dragdrop.getEventXY(event);\n dragdrop.initialX = xy.x;\n dragdrop.initialY = xy.y;\n dragdrop.initialPosition = dragProxy.offset();\n dragdrop.dragProxy = dragProxy;\n dragdrop.onMove = onMove;\n dragdrop.onDrop = onDrop;\n\n switch (event.type) {\n case 'mousedown':\n // Cannot use jQuery 'on' because events need to not be passive.\n dragdrop.addEventSpecial('mousemove', dragdrop.mouseMove);\n dragdrop.addEventSpecial('mouseup', dragdrop.mouseUp);\n break;\n case 'touchstart':\n dragdrop.addEventSpecial('touchend', dragdrop.touchEnd);\n dragdrop.addEventSpecial('touchcancel', dragdrop.touchEnd);\n dragdrop.addEventSpecial('touchmove', dragdrop.touchMove);\n dragdrop.touching = event.changedTouches[0].identifier;\n break;\n default:\n throw new Error('Unexpected event type: ' + event.type);\n }\n autoScroll.start(dragdrop.scroll);\n },\n\n /**\n * Adds an event listener with special event capture options (capture, not passive). If the\n * browser does not support passive events, it will fall back to the boolean for capture.\n *\n * @private\n * @param {Object} event Event type string\n * @param {Object} handler Handler function\n */\n addEventSpecial: function(event, handler) {\n try {\n window.addEventListener(event, handler, dragdrop.eventCaptureOptions);\n } catch (ex) {\n dragdrop.eventCaptureOptions = true;\n window.addEventListener(event, handler, dragdrop.eventCaptureOptions);\n }\n },\n\n /**\n * Gets X/Y co-ordinates of an event, which can be either touchstart or mousedown.\n *\n * @private\n * @param {Object} event Event (should be either mousedown or touchstart)\n * @return {Object} X/Y co-ordinates\n */\n getEventXY: function(event) {\n switch (event.type) {\n case 'touchstart':\n return {x: event.changedTouches[0].pageX,\n y: event.changedTouches[0].pageY};\n case 'mousedown':\n return {x: event.pageX, y: event.pageY};\n default:\n throw new Error('Unexpected event type: ' + event.type);\n }\n },\n\n /**\n * Event handler for touch move.\n *\n * @private\n * @param {Object} e Event\n */\n touchMove: function(e) {\n e.preventDefault();\n for (var i = 0; i < e.changedTouches.length; i++) {\n if (e.changedTouches[i].identifier === dragdrop.touching) {\n dragdrop.handleMove(e.changedTouches[i].pageX, e.changedTouches[i].pageY);\n }\n }\n },\n\n /**\n * Event handler for mouse move.\n *\n * @private\n * @param {Object} e Event\n */\n mouseMove: function(e) {\n dragdrop.handleMove(e.pageX, e.pageY);\n },\n\n /**\n * Shared handler for move event (mouse or touch).\n *\n * @private\n * @param {number} pageX X co-ordinate\n * @param {number} pageY Y co-ordinate\n */\n handleMove: function(pageX, pageY) {\n // Move the drag proxy, not letting you move it out of screen or window bounds.\n var current = dragdrop.dragProxy.offset();\n var topOffset = current.top - parseInt(dragdrop.dragProxy.css('top'));\n var leftOffset = current.left - parseInt(dragdrop.dragProxy.css('left'));\n var maxY = $(document).height() - dragdrop.dragProxy.outerHeight() - topOffset;\n var maxX = $(document).width() - dragdrop.dragProxy.outerWidth() - leftOffset;\n var minY = -topOffset;\n var minX = -leftOffset;\n var initial = dragdrop.initialPosition;\n var position = {\n top: Math.max(minY, Math.min(maxY, initial.top + (pageY - dragdrop.initialY) - topOffset)),\n left: Math.max(minX, Math.min(maxX, initial.left + (pageX - dragdrop.initialX) - leftOffset))\n };\n dragdrop.dragProxy.css(position);\n\n // Trigger move handler.\n dragdrop.onMove(pageX, pageY, dragdrop.dragProxy);\n },\n\n /**\n * Event handler for touch end.\n *\n * @private\n * @param {Object} e Event\n */\n touchEnd: function(e) {\n e.preventDefault();\n for (var i = 0; i < e.changedTouches.length; i++) {\n if (e.changedTouches[i].identifier === dragdrop.touching) {\n dragdrop.handleEnd(e.changedTouches[i].pageX, e.changedTouches[i].pageY);\n }\n }\n },\n\n /**\n * Event handler for mouse up.\n *\n * @private\n * @param {Object} e Event\n */\n mouseUp: function(e) {\n dragdrop.handleEnd(e.pageX, e.pageY);\n },\n\n /**\n * Shared handler for end drag (mouse or touch).\n *\n * @private\n * @param {number} pageX X\n * @param {number} pageY Y\n */\n handleEnd: function(pageX, pageY) {\n if (dragdrop.touching !== null) {\n window.removeEventListener('touchend', dragdrop.touchEnd, dragdrop.eventCaptureOptions);\n window.removeEventListener('touchcancel', dragdrop.touchEnd, dragdrop.eventCaptureOptions);\n window.removeEventListener('touchmove', dragdrop.touchMove, dragdrop.eventCaptureOptions);\n dragdrop.touching = null;\n } else {\n window.removeEventListener('mousemove', dragdrop.mouseMove, dragdrop.eventCaptureOptions);\n window.removeEventListener('mouseup', dragdrop.mouseUp, dragdrop.eventCaptureOptions);\n }\n autoScroll.stop();\n dragdrop.onDrop(pageX, pageY, dragdrop.dragProxy);\n },\n\n /**\n * Called when the page scrolls.\n *\n * @private\n * @param {number} offset Amount of scroll\n */\n scroll: function(offset) {\n // Move the proxy to match.\n var maxY = $(document).height() - dragdrop.dragProxy.outerHeight();\n var currentPosition = dragdrop.dragProxy.offset();\n currentPosition.top = Math.min(maxY, currentPosition.top + offset);\n dragdrop.dragProxy.css(currentPosition);\n }\n };\n\n return {\n /**\n * Prepares to begin a drag operation - call with a mousedown or touchstart event.\n *\n * If the returned object has 'start' true, then you can set up a drag proxy, and call\n * start. This function will call preventDefault automatically regardless of whether\n * starting or not.\n *\n * @param {Object} event Event (should be either mousedown or touchstart)\n * @return {Object} Object with start (boolean flag) and x, y (only if flag true) values\n */\n prepare: dragdrop.prepare,\n\n /**\n * Call to start a drag operation, in response to a mouse down or touch start event.\n * Normally call this after calling prepare and receiving start true (you can probably\n * skip prepare if only supporting drag not touch).\n *\n * Note: The caller is responsible for creating a 'drag proxy' which is the\n * thing that actually gets dragged. At present, this doesn't really work\n * properly unless it is added directly within the body tag.\n *\n * You also need to ensure that there is CSS so the proxy is absolutely positioned,\n * and styled to look like it is floating.\n *\n * You also need to absolutely position the proxy where you want it to start.\n *\n * @param {Object} event Event (should be either mousedown or touchstart)\n * @param {jQuery} dragProxy An absolute-positioned element for dragging\n * @param {Object} onMove Function that receives X and Y page locations for a move\n * @param {Object} onDrop Function that receives X and Y page locations when dropped\n */\n start: dragdrop.start\n };\n});\n"],"file":"dragdrop.min.js"}