source: Dev/trunk/src/client/dojo/dnd/move.js

define([
        "../_base/declare",
        "../dom-geometry", "../dom-style",
        "./common", "./Mover", "./Moveable"
], function(declare, domGeom, domStyle, dnd, Mover, Moveable){

// module:
//              dojo/dnd/move

/*=====
var __constrainedMoveableArgs = declare([Moveable.__MoveableArgs], {
        // constraints: Function
        //              Calculates a constraint box.
        //              It is called in a context of the moveable object.
        constraints: function(){},

        // within: Boolean
        //              restrict move within boundaries.
        within: false
});
=====*/

var constrainedMoveable = declare("dojo.dnd.move.constrainedMoveable", Moveable, {
        // object attributes (for markup)
        constraints: function(){},
        within: false,

        constructor: function(node, params){
                // summary:
                //              an object that makes a node moveable
                // node: Node
                //              a node (or node's id) to be moved
                // params: __constrainedMoveableArgs?
                //              an optional object with additional parameters;
                //              the rest is passed to the base class
                if(!params){ params = {}; }
                this.constraints = params.constraints;
                this.within = params.within;
        },
        onFirstMove: function(/*Mover*/ mover){
                // summary:
                //              called during the very first move notification;
                //              can be used to initialize coordinates, can be overwritten.
                var c = this.constraintBox = this.constraints.call(this, mover);
                c.r = c.l + c.w;
                c.b = c.t + c.h;
                if(this.within){
                        var mb = domGeom.getMarginSize(mover.node);
                        c.r -= mb.w;
                        c.b -= mb.h;
                }
        },
        onMove: function(/*Mover*/ mover, /*Object*/ leftTop){
                // summary:
                //              called during every move notification;
                //              should actually move the node; can be overwritten.
                var c = this.constraintBox, s = mover.node.style;
                this.onMoving(mover, leftTop);
                leftTop.l = leftTop.l < c.l ? c.l : c.r < leftTop.l ? c.r : leftTop.l;
                leftTop.t = leftTop.t < c.t ? c.t : c.b < leftTop.t ? c.b : leftTop.t;
                s.left = leftTop.l + "px";
                s.top  = leftTop.t + "px";
                this.onMoved(mover, leftTop);
        }
});

/*=====
var __boxConstrainedMoveableArgs = declare([__constrainedMoveableArgs], {
        // box: Object
        //              a constraint box
        box: {}
});
=====*/

var boxConstrainedMoveable = declare("dojo.dnd.move.boxConstrainedMoveable", constrainedMoveable, {
        // box:
        //              object attributes (for markup)
        box: {},

        constructor: function(node, params){
                // summary:
                //              an object, which makes a node moveable
                // node: Node
                //              a node (or node's id) to be moved
                // params: __boxConstrainedMoveableArgs?
                //              an optional object with parameters
                var box = params && params.box;
                this.constraints = function(){ return box; };
        }
});

/*=====
var __parentConstrainedMoveableArgs = declare( [__constrainedMoveableArgs], {
        // area: String
        //              A parent's area to restrict the move.
        //              Can be "margin", "border", "padding", or "content".
        area: ""
});
=====*/

var parentConstrainedMoveable = declare("dojo.dnd.move.parentConstrainedMoveable", constrainedMoveable, {
        // area:
        //              object attributes (for markup)
        area: "content",

        constructor: function(node, params){
                // summary:
                //              an object, which makes a node moveable
                // node: Node
                //              a node (or node's id) to be moved
                // params: __parentConstrainedMoveableArgs?
                //              an optional object with parameters
                var area = params && params.area;
                this.constraints = function(){
                        var n = this.node.parentNode,
                                s = domStyle.getComputedStyle(n),
                                mb = domGeom.getMarginBox(n, s);
                        if(area == "margin"){
                                return mb;      // Object
                        }
                        var t = domGeom.getMarginExtents(n, s);
                        mb.l += t.l, mb.t += t.t, mb.w -= t.w, mb.h -= t.h;
                        if(area == "border"){
                                return mb;      // Object
                        }
                        t = domGeom.getBorderExtents(n, s);
                        mb.l += t.l, mb.t += t.t, mb.w -= t.w, mb.h -= t.h;
                        if(area == "padding"){
                                return mb;      // Object
                        }
                        t = domGeom.getPadExtents(n, s);
                        mb.l += t.l, mb.t += t.t, mb.w -= t.w, mb.h -= t.h;
                        return mb;      // Object
                };
        }
});


return {
        // summary:
        //              TODOC
        constrainedMoveable: constrainedMoveable,
        boxConstrainedMoveable: boxConstrainedMoveable,
        parentConstrainedMoveable: parentConstrainedMoveable
};

});