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125 lines
4.1 KiB
JavaScript
125 lines
4.1 KiB
JavaScript
12 years ago
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define("dojo/dnd/Mover", [
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"../_base/array", "../_base/declare", "../_base/event", "../_base/lang", "../sniff", "../_base/window",
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"../dom", "../dom-geometry", "../dom-style", "../Evented", "../on", "../touch", "./common", "./autoscroll"
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], function(array, declare, event, lang, has, win, dom, domGeom, domStyle, Evented, on, touch, dnd, autoscroll){
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// module:
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// dojo/dnd/Mover
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return declare("dojo.dnd.Mover", [Evented], {
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// summary:
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// an object which makes a node follow the mouse, or touch-drag on touch devices.
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// Used as a default mover, and as a base class for custom movers.
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constructor: function(node, e, host){
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// node: Node
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// a node (or node's id) to be moved
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// e: Event
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// a mouse event, which started the move;
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// only pageX and pageY properties are used
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// host: Object?
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// object which implements the functionality of the move,
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// and defines proper events (onMoveStart and onMoveStop)
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this.node = dom.byId(node);
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this.marginBox = {l: e.pageX, t: e.pageY};
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this.mouseButton = e.button;
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var h = (this.host = host), d = node.ownerDocument;
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this.events = [
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// At the start of a drag, onFirstMove is called, and then the following
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// listener is disconnected.
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on(d, touch.move, lang.hitch(this, "onFirstMove")),
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// These are called continually during the drag
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on(d, touch.move, lang.hitch(this, "onMouseMove")),
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// And these are called at the end of the drag
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on(d, touch.release, lang.hitch(this, "onMouseUp")),
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// cancel text selection and text dragging
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on(d, "dragstart", event.stop),
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on(d.body, "selectstart", event.stop)
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];
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// Tell autoscroll that a drag is starting
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autoscroll.autoScrollStart(d);
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// notify that the move has started
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if(h && h.onMoveStart){
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h.onMoveStart(this);
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}
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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/ontouchmove
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// e: Event
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// mouse/touch event
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autoscroll.autoScroll(e);
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var m = this.marginBox;
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this.host.onMove(this, {l: m.l + e.pageX, t: m.t + e.pageY}, e);
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event.stop(e);
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},
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onMouseUp: function(e){
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if(has("webkit") && has("mac") && this.mouseButton == 2 ?
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e.button == 0 : this.mouseButton == e.button){ // TODO Should condition be met for touch devices, too?
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this.destroy();
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}
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event.stop(e);
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},
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// utilities
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onFirstMove: function(e){
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// summary:
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// makes the node absolute; it is meant to be called only once.
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// relative and absolutely positioned nodes are assumed to use pixel units
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var s = this.node.style, l, t, h = this.host;
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switch(s.position){
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case "relative":
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case "absolute":
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// assume that left and top values are in pixels already
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l = Math.round(parseFloat(s.left)) || 0;
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t = Math.round(parseFloat(s.top)) || 0;
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break;
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default:
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s.position = "absolute"; // enforcing the absolute mode
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var m = domGeom.getMarginBox(this.node);
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// event.pageX/pageY (which we used to generate the initial
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// margin box) includes padding and margin set on the body.
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// However, setting the node's position to absolute and then
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// doing domGeom.marginBox on it *doesn't* take that additional
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// space into account - so we need to subtract the combined
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// padding and margin. We use getComputedStyle and
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// _getMarginBox/_getContentBox to avoid the extra lookup of
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// the computed style.
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var b = win.doc.body;
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var bs = domStyle.getComputedStyle(b);
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var bm = domGeom.getMarginBox(b, bs);
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var bc = domGeom.getContentBox(b, bs);
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l = m.l - (bc.l - bm.l);
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t = m.t - (bc.t - bm.t);
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break;
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}
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this.marginBox.l = l - this.marginBox.l;
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this.marginBox.t = t - this.marginBox.t;
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if(h && h.onFirstMove){
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h.onFirstMove(this, e);
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}
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// Disconnect touch.move that call this function
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this.events.shift().remove();
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},
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destroy: function(){
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// summary:
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// stops the move, deletes all references, so the object can be garbage-collected
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array.forEach(this.events, function(handle){ handle.remove(); });
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// undo global settings
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var h = this.host;
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if(h && h.onMoveStop){
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h.onMoveStop(this);
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}
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// destroy objects
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this.events = this.node = this.host = null;
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}
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});
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});
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