70 lines
2 KiB
JavaScript
70 lines
2 KiB
JavaScript
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define("dojo/dnd/TimedMoveable", ["../main", "./Moveable"], function(dojo) {
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// module:
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// dojo/dnd/TimedMoveable
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// summary:
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// TODOC
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/*=====
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dojo.declare("dojo.dnd.__TimedMoveableArgs", [dojo.dnd.__MoveableArgs], {
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// timeout: Number
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// delay move by this number of ms,
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// accumulating position changes during the timeout
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timeout: 0
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});
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=====*/
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// precalculate long expressions
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var oldOnMove = dojo.dnd.Moveable.prototype.onMove;
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dojo.declare("dojo.dnd.TimedMoveable", dojo.dnd.Moveable, {
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// summary:
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// A specialized version of Moveable to support an FPS throttling.
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// This class puts an upper restriction on FPS, which may reduce
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// the CPU load. The additional parameter "timeout" regulates
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// the delay before actually moving the moveable object.
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// object attributes (for markup)
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timeout: 40, // in ms, 40ms corresponds to 25 fps
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constructor: function(node, params){
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// summary:
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// an object that makes a node moveable with a timer
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// node: Node||String
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// a node (or node's id) to be moved
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// params: dojo.dnd.__TimedMoveableArgs
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// object with additional parameters.
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// sanitize parameters
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if(!params){ params = {}; }
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if(params.timeout && typeof params.timeout == "number" && params.timeout >= 0){
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this.timeout = params.timeout;
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}
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},
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onMoveStop: function(/* dojo.dnd.Mover */ mover){
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if(mover._timer){
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// stop timer
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clearTimeout(mover._timer);
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// reflect the last received position
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oldOnMove.call(this, mover, mover._leftTop)
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}
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dojo.dnd.Moveable.prototype.onMoveStop.apply(this, arguments);
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},
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onMove: function(/* dojo.dnd.Mover */ mover, /* Object */ leftTop){
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mover._leftTop = leftTop;
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if(!mover._timer){
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var _t = this; // to avoid using dojo.hitch()
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mover._timer = setTimeout(function(){
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// we don't have any pending requests
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mover._timer = null;
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// reflect the last received position
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oldOnMove.call(_t, mover, mover._leftTop);
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}, this.timeout);
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}
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}
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});
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return dojo.dnd.TimedMoveable;
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});
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