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507 lines
15 KiB
JavaScript
507 lines
15 KiB
JavaScript
define("dojo/dnd/Source", [
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"../_base/array", "../_base/connect", "../_base/declare", "../_base/kernel", "../_base/lang",
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"../dom-class", "../dom-geometry", "../mouse", "../ready", "../topic",
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"./common", "./Selector", "./Manager"
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], function(array, connect, declare, kernel, lang, domClass, domGeom, mouse, ready, topic,
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dnd, Selector, Manager){
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// module:
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// dojo/dnd/Source
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/*
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Container property:
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"Horizontal"- if this is the horizontal container
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Source states:
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"" - normal state
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"Moved" - this source is being moved
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"Copied" - this source is being copied
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Target states:
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"" - normal state
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"Disabled" - the target cannot accept an avatar
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Target anchor state:
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"" - item is not selected
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"Before" - insert point is before the anchor
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"After" - insert point is after the anchor
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*/
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/*=====
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var __SourceArgs = {
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// summary:
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// a dict of parameters for DnD Source configuration. Note that any
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// property on Source elements may be configured, but this is the
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// short-list
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// isSource: Boolean?
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// can be used as a DnD source. Defaults to true.
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// accept: Array?
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// list of accepted types (text strings) for a target; defaults to
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// ["text"]
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// autoSync: Boolean
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// if true refreshes the node list on every operation; false by default
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// copyOnly: Boolean?
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// copy items, if true, use a state of Ctrl key otherwise,
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// see selfCopy and selfAccept for more details
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// delay: Number
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// the move delay in pixels before detecting a drag; 0 by default
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// horizontal: Boolean?
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// a horizontal container, if true, vertical otherwise or when omitted
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// selfCopy: Boolean?
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// copy items by default when dropping on itself,
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// false by default, works only if copyOnly is true
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// selfAccept: Boolean?
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// accept its own items when copyOnly is true,
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// true by default, works only if copyOnly is true
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// withHandles: Boolean?
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// allows dragging only by handles, false by default
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// generateText: Boolean?
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// generate text node for drag and drop, true by default
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};
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=====*/
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// For back-compat, remove in 2.0.
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if(!kernel.isAsync){
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ready(0, function(){
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var requires = ["dojo/dnd/AutoSource", "dojo/dnd/Target"];
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require(requires); // use indirection so modules not rolled into a build
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});
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}
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var Source = declare("dojo.dnd.Source", Selector, {
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// summary:
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// a Source object, which can be used as a DnD source, or a DnD target
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// object attributes (for markup)
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isSource: true,
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horizontal: false,
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copyOnly: false,
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selfCopy: false,
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selfAccept: true,
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skipForm: false,
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withHandles: false,
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autoSync: false,
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delay: 0, // pixels
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accept: ["text"],
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generateText: true,
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constructor: function(/*DOMNode|String*/ node, /*__SourceArgs?*/ params){
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// summary:
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// a constructor of the Source
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// node:
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// node or node's id to build the source on
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// params:
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// any property of this class may be configured via the params
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// object which is mixed-in to the `dojo/dnd/Source` instance
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lang.mixin(this, lang.mixin({}, params));
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var type = this.accept;
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if(type.length){
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this.accept = {};
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for(var i = 0; i < type.length; ++i){
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this.accept[type[i]] = 1;
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}
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}
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// class-specific variables
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this.isDragging = false;
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this.mouseDown = false;
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this.targetAnchor = null;
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this.targetBox = null;
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this.before = true;
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this._lastX = 0;
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this._lastY = 0;
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// states
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this.sourceState = "";
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if(this.isSource){
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domClass.add(this.node, "dojoDndSource");
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}
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this.targetState = "";
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if(this.accept){
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domClass.add(this.node, "dojoDndTarget");
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}
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if(this.horizontal){
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domClass.add(this.node, "dojoDndHorizontal");
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}
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// set up events
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this.topics = [
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topic.subscribe("/dnd/source/over", lang.hitch(this, "onDndSourceOver")),
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topic.subscribe("/dnd/start", lang.hitch(this, "onDndStart")),
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topic.subscribe("/dnd/drop", lang.hitch(this, "onDndDrop")),
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topic.subscribe("/dnd/cancel", lang.hitch(this, "onDndCancel"))
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];
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},
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// methods
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checkAcceptance: function(source, nodes){
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// summary:
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// checks if the target can accept nodes from this source
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// source: Object
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// the source which provides items
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// nodes: Array
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// the list of transferred items
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if(this == source){
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return !this.copyOnly || this.selfAccept;
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}
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for(var i = 0; i < nodes.length; ++i){
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var type = source.getItem(nodes[i].id).type;
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// type instanceof Array
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var flag = false;
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for(var j = 0; j < type.length; ++j){
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if(type[j] in this.accept){
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flag = true;
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break;
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}
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}
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if(!flag){
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return false; // Boolean
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}
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}
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return true; // Boolean
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},
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copyState: function(keyPressed, self){
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// summary:
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// Returns true if we need to copy items, false to move.
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// It is separated to be overwritten dynamically, if needed.
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// keyPressed: Boolean
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// the "copy" key was pressed
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// self: Boolean?
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// optional flag that means that we are about to drop on itself
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if(keyPressed){ return true; }
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if(arguments.length < 2){
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self = this == Manager.manager().target;
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}
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if(self){
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if(this.copyOnly){
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return this.selfCopy;
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}
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}else{
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return this.copyOnly;
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}
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return false; // Boolean
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},
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destroy: function(){
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// summary:
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// prepares the object to be garbage-collected
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Source.superclass.destroy.call(this);
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array.forEach(this.topics, function(t){t.remove();});
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this.targetAnchor = null;
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},
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// mouse event processors
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onMouseMove: function(e){
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// summary:
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// event processor for onmousemove
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// e: Event
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// mouse event
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if(this.isDragging && this.targetState == "Disabled"){ return; }
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Source.superclass.onMouseMove.call(this, e);
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var m = Manager.manager();
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if(!this.isDragging){
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if(this.mouseDown && this.isSource &&
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(Math.abs(e.pageX - this._lastX) > this.delay || Math.abs(e.pageY - this._lastY) > this.delay)){
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var nodes = this.getSelectedNodes();
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if(nodes.length){
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m.startDrag(this, nodes, this.copyState(dnd.getCopyKeyState(e), true));
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}
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}
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}
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if(this.isDragging){
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// calculate before/after
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var before = false;
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if(this.current){
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if(!this.targetBox || this.targetAnchor != this.current){
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this.targetBox = domGeom.position(this.current, true);
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}
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if(this.horizontal){
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// In LTR mode, the left part of the object means "before", but in RTL mode it means "after".
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before = (e.pageX - this.targetBox.x < this.targetBox.w / 2) == domGeom.isBodyLtr(this.current.ownerDocument);
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}else{
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before = (e.pageY - this.targetBox.y) < (this.targetBox.h / 2);
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}
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}
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if(this.current != this.targetAnchor || before != this.before){
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this._markTargetAnchor(before);
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m.canDrop(!this.current || m.source != this || !(this.current.id in this.selection));
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}
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}
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},
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onMouseDown: function(e){
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// summary:
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// event processor for onmousedown
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// e: Event
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// mouse event
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if(!this.mouseDown && this._legalMouseDown(e) && (!this.skipForm || !dnd.isFormElement(e))){
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this.mouseDown = true;
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this._lastX = e.pageX;
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this._lastY = e.pageY;
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Source.superclass.onMouseDown.call(this, e);
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}
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},
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onMouseUp: function(e){
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// summary:
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// event processor for onmouseup
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// e: Event
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// mouse event
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if(this.mouseDown){
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this.mouseDown = false;
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Source.superclass.onMouseUp.call(this, e);
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}
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},
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// topic event processors
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onDndSourceOver: function(source){
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// summary:
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// topic event processor for /dnd/source/over, called when detected a current source
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// source: Object
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// the source which has the mouse over it
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if(this !== source){
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this.mouseDown = false;
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if(this.targetAnchor){
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this._unmarkTargetAnchor();
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}
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}else if(this.isDragging){
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var m = Manager.manager();
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m.canDrop(this.targetState != "Disabled" && (!this.current || m.source != this || !(this.current.id in this.selection)));
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}
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},
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onDndStart: function(source, nodes, copy){
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// summary:
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// topic event processor for /dnd/start, called to initiate the DnD operation
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// source: Object
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// the source which provides items
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// nodes: Array
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// the list of transferred items
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// copy: Boolean
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// copy items, if true, move items otherwise
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if(this.autoSync){ this.sync(); }
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if(this.isSource){
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this._changeState("Source", this == source ? (copy ? "Copied" : "Moved") : "");
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}
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var accepted = this.accept && this.checkAcceptance(source, nodes);
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this._changeState("Target", accepted ? "" : "Disabled");
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if(this == source){
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Manager.manager().overSource(this);
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}
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this.isDragging = true;
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},
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onDndDrop: function(source, nodes, copy, target){
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// summary:
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// topic event processor for /dnd/drop, called to finish the DnD operation
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// source: Object
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// the source which provides items
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// nodes: Array
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// the list of transferred items
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// copy: Boolean
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// copy items, if true, move items otherwise
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// target: Object
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// the target which accepts items
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if(this == target){
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// this one is for us => move nodes!
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this.onDrop(source, nodes, copy);
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}
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this.onDndCancel();
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},
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onDndCancel: function(){
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// summary:
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// topic event processor for /dnd/cancel, called to cancel the DnD operation
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if(this.targetAnchor){
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this._unmarkTargetAnchor();
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this.targetAnchor = null;
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}
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this.before = true;
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this.isDragging = false;
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this.mouseDown = false;
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this._changeState("Source", "");
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this._changeState("Target", "");
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},
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// local events
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onDrop: function(source, nodes, copy){
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// summary:
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// called only on the current target, when drop is performed
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// source: Object
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// the source which provides items
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// nodes: Array
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// the list of transferred items
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// copy: Boolean
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// copy items, if true, move items otherwise
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if(this != source){
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this.onDropExternal(source, nodes, copy);
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}else{
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this.onDropInternal(nodes, copy);
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}
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},
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onDropExternal: function(source, nodes, copy){
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// summary:
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// called only on the current target, when drop is performed
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// from an external source
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// source: Object
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// the source which provides items
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// nodes: Array
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// the list of transferred items
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// copy: Boolean
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// copy items, if true, move items otherwise
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var oldCreator = this._normalizedCreator;
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// transferring nodes from the source to the target
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if(this.creator){
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// use defined creator
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this._normalizedCreator = function(node, hint){
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return oldCreator.call(this, source.getItem(node.id).data, hint);
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};
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}else{
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// we have no creator defined => move/clone nodes
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if(copy){
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// clone nodes
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this._normalizedCreator = function(node /*=====, hint =====*/){
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var t = source.getItem(node.id);
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var n = node.cloneNode(true);
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n.id = dnd.getUniqueId();
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return {node: n, data: t.data, type: t.type};
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};
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}else{
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// move nodes
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this._normalizedCreator = function(node /*=====, hint =====*/){
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var t = source.getItem(node.id);
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source.delItem(node.id);
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return {node: node, data: t.data, type: t.type};
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};
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}
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}
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this.selectNone();
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if(!copy && !this.creator){
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source.selectNone();
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}
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this.insertNodes(true, nodes, this.before, this.current);
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if(!copy && this.creator){
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source.deleteSelectedNodes();
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}
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this._normalizedCreator = oldCreator;
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},
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onDropInternal: function(nodes, copy){
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// summary:
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// called only on the current target, when drop is performed
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// from the same target/source
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// nodes: Array
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// the list of transferred items
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// copy: Boolean
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// copy items, if true, move items otherwise
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var oldCreator = this._normalizedCreator;
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// transferring nodes within the single source
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if(this.current && this.current.id in this.selection){
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// do nothing
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return;
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}
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if(copy){
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if(this.creator){
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// create new copies of data items
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this._normalizedCreator = function(node, hint){
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return oldCreator.call(this, this.getItem(node.id).data, hint);
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};
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}else{
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// clone nodes
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this._normalizedCreator = function(node/*=====, hint =====*/){
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var t = this.getItem(node.id);
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var n = node.cloneNode(true);
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n.id = dnd.getUniqueId();
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return {node: n, data: t.data, type: t.type};
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};
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}
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}else{
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// move nodes
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if(!this.current){
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// do nothing
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return;
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}
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this._normalizedCreator = function(node /*=====, hint =====*/){
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var t = this.getItem(node.id);
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return {node: node, data: t.data, type: t.type};
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};
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}
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this._removeSelection();
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this.insertNodes(true, nodes, this.before, this.current);
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this._normalizedCreator = oldCreator;
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},
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onDraggingOver: function(){
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// summary:
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// called during the active DnD operation, when items
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// are dragged over this target, and it is not disabled
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},
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onDraggingOut: function(){
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// summary:
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// called during the active DnD operation, when items
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// are dragged away from this target, and it is not disabled
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},
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// utilities
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onOverEvent: function(){
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// summary:
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// this function is called once, when mouse is over our container
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Source.superclass.onOverEvent.call(this);
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Manager.manager().overSource(this);
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if(this.isDragging && this.targetState != "Disabled"){
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this.onDraggingOver();
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}
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},
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onOutEvent: function(){
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// summary:
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// this function is called once, when mouse is out of our container
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Source.superclass.onOutEvent.call(this);
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Manager.manager().outSource(this);
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if(this.isDragging && this.targetState != "Disabled"){
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this.onDraggingOut();
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}
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},
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_markTargetAnchor: function(before){
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// summary:
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// assigns a class to the current target anchor based on "before" status
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// before: Boolean
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// insert before, if true, after otherwise
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if(this.current == this.targetAnchor && this.before == before){ return; }
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if(this.targetAnchor){
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this._removeItemClass(this.targetAnchor, this.before ? "Before" : "After");
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}
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this.targetAnchor = this.current;
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this.targetBox = null;
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this.before = before;
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if(this.targetAnchor){
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this._addItemClass(this.targetAnchor, this.before ? "Before" : "After");
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}
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},
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_unmarkTargetAnchor: function(){
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// summary:
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// removes a class of the current target anchor based on "before" status
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if(!this.targetAnchor){ return; }
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this._removeItemClass(this.targetAnchor, this.before ? "Before" : "After");
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this.targetAnchor = null;
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this.targetBox = null;
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this.before = true;
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},
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_markDndStatus: function(copy){
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// summary:
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// changes source's state based on "copy" status
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this._changeState("Source", copy ? "Copied" : "Moved");
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},
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_legalMouseDown: function(e){
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// summary:
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// checks if user clicked on "approved" items
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// e: Event
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// mouse event
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// accept only the left mouse button, or the left finger
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if(e.type != "touchstart" && !mouse.isLeft(e)){ return false; }
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if(!this.withHandles){ return true; }
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// check for handles
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for(var node = e.target; node && node !== this.node; node = node.parentNode){
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if(domClass.contains(node, "dojoDndHandle")){ return true; }
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if(domClass.contains(node, "dojoDndItem") || domClass.contains(node, "dojoDndIgnore")){ break; }
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}
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return false; // Boolean
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}
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});
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return Source;
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});
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