mirror of https://github.com/RubaXa/Sortable.git
Lebedev Konstantin
8 years ago
7 changed files with 84 additions and 282 deletions
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/*global ko*/ |
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(function (factory) { |
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"use strict"; |
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//get ko ref via global or require
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var koRef; |
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if (typeof ko !== 'undefined') { |
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//global ref already defined
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koRef = ko; |
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} |
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else if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') { |
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//commonjs / node.js
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koRef = require('knockout'); |
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} |
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//get sortable ref via global or require
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var sortableRef; |
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if (typeof Sortable !== 'undefined') { |
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//global ref already defined
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sortableRef = Sortable; |
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} |
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else if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') { |
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//commonjs / node.js
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sortableRef = require('sortablejs'); |
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} |
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//use references if we found them
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if (koRef !== undefined && sortableRef !== undefined) { |
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factory(koRef, sortableRef); |
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} |
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//if both references aren't found yet, get via AMD if available
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else if (typeof define === 'function' && define.amd) { |
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//we may have a reference to only 1, or none
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if (koRef !== undefined && sortableRef === undefined) { |
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define(['./Sortable'], function (amdSortableRef) { |
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factory(koRef, amdSortableRef); |
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}); |
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} |
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else if (koRef === undefined && sortableRef !== undefined) { |
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define(['knockout'], function (amdKnockout) { |
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factory(amdKnockout, sortableRef); |
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}); |
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} |
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else if (koRef === undefined && sortableRef === undefined) { |
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define(['knockout', './Sortable'], factory); |
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} |
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} |
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//no more routes to get references
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else { |
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//report specific error
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if (koRef !== undefined && sortableRef === undefined) { |
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throw new Error('knockout-sortable could not get reference to Sortable'); |
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} |
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else if (koRef === undefined && sortableRef !== undefined) { |
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throw new Error('knockout-sortable could not get reference to Knockout'); |
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} |
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else if (koRef === undefined && sortableRef === undefined) { |
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throw new Error('knockout-sortable could not get reference to Knockout or Sortable'); |
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} |
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} |
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})(function (ko, Sortable) { |
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"use strict"; |
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var init = function (element, valueAccessor, allBindings, viewModel, bindingContext, sortableOptions) { |
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var options = buildOptions(valueAccessor, sortableOptions); |
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// It's seems that we cannot update the eventhandlers after we've created
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// the sortable, so define them in init instead of update
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['onStart', 'onEnd', 'onRemove', 'onAdd', 'onUpdate', 'onSort', 'onFilter', 'onMove', 'onClone'].forEach(function (e) { |
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if (options[e] || eventHandlers[e]) |
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options[e] = function (eventType, parentVM, parentBindings, handler, e) { |
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var itemVM = ko.dataFor(e.item), |
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// All of the bindings on the parent element
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bindings = ko.utils.peekObservable(parentBindings()), |
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// The binding options for the draggable/sortable binding of the parent element
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bindingHandlerBinding = bindings.sortable || bindings.draggable, |
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// The collection that we should modify
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collection = bindingHandlerBinding.collection || bindingHandlerBinding.foreach; |
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if (handler) |
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handler(e, itemVM, parentVM, collection, bindings); |
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if (eventHandlers[eventType]) |
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eventHandlers[eventType](e, itemVM, parentVM, collection, bindings); |
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}.bind(undefined, e, viewModel, allBindings, options[e]); |
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}); |
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var sortableElement = Sortable.create(element, options); |
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// Destroy the sortable if knockout disposes the element it's connected to
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ko.utils.domNodeDisposal.addDisposeCallback(element, function () { |
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sortableElement.destroy(); |
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}); |
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return ko.bindingHandlers.template.init(element, valueAccessor); |
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}, |
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update = function (element, valueAccessor, allBindings, viewModel, bindingContext, sortableOptions) { |
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// There seems to be some problems with updating the options of a sortable
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// Tested to change eventhandlers and the group options without any luck
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return ko.bindingHandlers.template.update(element, valueAccessor, allBindings, viewModel, bindingContext); |
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}, |
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eventHandlers = (function (handlers) { |
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var moveOperations = [], |
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tryMoveOperation = function (e, itemVM, parentVM, collection, parentBindings) { |
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// A move operation is the combination of a add and remove event,
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// this is to make sure that we have both the target and origin collections
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var currentOperation = { event: e, itemVM: itemVM, parentVM: parentVM, collection: collection, parentBindings: parentBindings }, |
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existingOperation = moveOperations.filter(function (op) { |
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return op.itemVM === currentOperation.itemVM; |
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})[0]; |
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if (!existingOperation) { |
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moveOperations.push(currentOperation); |
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} |
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else { |
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// We're finishing the operation and already have a handle on
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// the operation item meaning that it's safe to remove it
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moveOperations.splice(moveOperations.indexOf(existingOperation), 1); |
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var removeOperation = currentOperation.event.type === 'remove' ? currentOperation : existingOperation, |
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addOperation = currentOperation.event.type === 'add' ? currentOperation : existingOperation; |
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moveItem(itemVM, removeOperation.collection, addOperation.collection, addOperation.event.clone, addOperation.event); |
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} |
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}, |
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// Moves an item from the "from" collection to the "to" collection, these
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// can be references to the same collection which means it's a sort.
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// clone indicates if we should move or copy the item into the new collection
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moveItem = function (itemVM, from, to, clone, e) { |
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// Unwrapping this allows us to manipulate the actual array
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var fromArray = from(), |
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// It's not certain that the items actual index is the same
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// as the index reported by sortable due to filtering etc.
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originalIndex = fromArray.indexOf(itemVM), |
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newIndex = e.newIndex; |
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// We have to find out the actual desired index of the to array,
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// as this might be a computed array. We could otherwise potentially
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// drop an item above the 3rd visible item, but the 2nd visible item
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// has an actual index of 5.
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if (e.item.previousElementSibling) { |
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newIndex = to().indexOf(ko.dataFor(e.item.previousElementSibling)) + 1; |
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} |
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// Remove sortables "unbound" element
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e.item.parentNode.removeChild(e.item); |
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// This splice is necessary for both clone and move/sort
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// In sort/move since it shouldn't be at this index/in this array anymore
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// In clone since we have to work around knockouts valuHasMutated
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// when manipulating arrays and avoid a "unbound" item added by sortable
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fromArray.splice(originalIndex, 1); |
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// Update the array, this will also remove sortables "unbound" clone
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from.valueHasMutated(); |
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if (clone && from !== to) { |
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// Read the item
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fromArray.splice(originalIndex, 0, itemVM); |
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// Force knockout to update
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from.valueHasMutated(); |
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} |
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// Force deferred tasks to run now, registering the removal
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ko.tasks.runEarly(); |
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// Insert the item on its new position
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to().splice(newIndex, 0, itemVM); |
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// Make sure to tell knockout that we've modified the actual array.
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to.valueHasMutated(); |
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}; |
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handlers.onRemove = tryMoveOperation; |
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handlers.onAdd = tryMoveOperation; |
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handlers.onUpdate = function (e, itemVM, parentVM, collection, parentBindings) { |
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// This will be performed as a sort since the to/from collections
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// reference the same collection and clone is set to false
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moveItem(itemVM, collection, collection, false, e); |
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}; |
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return handlers; |
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})({}), |
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// bindingOptions are the options set in the "data-bind" attribute in the ui.
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// options are custom options, for instance draggable/sortable specific options
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buildOptions = function (bindingOptions, options) { |
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// deep clone/copy of properties from the "from" argument onto
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// the "into" argument and returns the modified "into"
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var merge = function (into, from) { |
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for (var prop in from) { |
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if (Object.prototype.toString.call(from[prop]) === '[object Object]') { |
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if (Object.prototype.toString.call(into[prop]) !== '[object Object]') { |
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into[prop] = {}; |
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} |
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into[prop] = merge(into[prop], from[prop]); |
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} |
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else |
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into[prop] = from[prop]; |
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} |
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return into; |
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}, |
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// unwrap the supplied options
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unwrappedOptions = ko.utils.peekObservable(bindingOptions()).options || {}; |
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// Make sure that we don't modify the provided settings object
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options = merge({}, options); |
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// group is handled differently since we should both allow to change
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// a draggable to a sortable (and vice versa), but still be able to set
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// a name on a draggable without it becoming a drop target.
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if (unwrappedOptions.group && Object.prototype.toString.call(unwrappedOptions.group) !== '[object Object]') { |
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// group property is a name string declaration, convert to object.
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unwrappedOptions.group = { name: unwrappedOptions.group }; |
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} |
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return merge(options, unwrappedOptions); |
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}; |
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ko.bindingHandlers.draggable = { |
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sortableOptions: { |
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group: { pull: 'clone', put: false }, |
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sort: false |
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}, |
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init: function (element, valueAccessor, allBindings, viewModel, bindingContext) { |
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return init(element, valueAccessor, allBindings, viewModel, bindingContext, ko.bindingHandlers.draggable.sortableOptions); |
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}, |
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update: function (element, valueAccessor, allBindings, viewModel, bindingContext) { |
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return update(element, valueAccessor, allBindings, viewModel, bindingContext, ko.bindingHandlers.draggable.sortableOptions); |
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} |
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}; |
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ko.bindingHandlers.sortable = { |
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sortableOptions: { |
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group: { pull: true, put: true } |
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}, |
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init: function (element, valueAccessor, allBindings, viewModel, bindingContext) { |
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return init(element, valueAccessor, allBindings, viewModel, bindingContext, ko.bindingHandlers.sortable.sortableOptions); |
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}, |
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update: function (element, valueAccessor, allBindings, viewModel, bindingContext) { |
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return update(element, valueAccessor, allBindings, viewModel, bindingContext, ko.bindingHandlers.sortable.sortableOptions); |
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} |
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}; |
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}); |
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