# Resizable.js

    /**
     * @class Ext.Resizable
     * @extends Ext.util.Observable
     * <p>Applies drag handles to an element to make it resizable. The drag handles are inserted into the element
     * and positioned absolute. Some elements, such as a textarea or image, don't support this. To overcome that, you can wrap
     * the textarea in a div and set "resizeChild" to true (or to the id of the element), <b>or</b> set wrap:true in your config and
     * the element will be wrapped for you automatically.</p>
     * <p>Here is the list of valid resize handles:</p>
     * <pre>
    Value   Description
    ------  -------------------
     'n'     north
     's'     south
     'e'     east
     'w'     west
     'nw'    northwest
     'sw'    southwest
     'se'    southeast
     'ne'    northeast
     'all'   all
    </pre>
     * <p>Here's an example showing the creation of a typical Resizable:</p>
     * <pre><code>
    var resizer = new Ext.Resizable("element-id", {
        handles: 'all',
        minWidth: 200,
        minHeight: 100,
        maxWidth: 500,
        maxHeight: 400,
        pinned: true
    });
    resizer.on("resize", myHandler);
    </code></pre>
     * <p>To hide a particular handle, set its display to none in CSS, or through script:<br>
     * resizer.east.setDisplayed(false);</p>
     * @cfg {Boolean/String/Element} resizeChild True to resize the first child, or id/element to resize (defaults to false)
     * @cfg {Array/String} adjustments String "auto" or an array [width, height] with values to be <b>added</b> to the
     * resize operation's new size (defaults to [0, 0])
     * @cfg {Number} minWidth The minimum width for the element (defaults to 5)
     * @cfg {Number} minHeight The minimum height for the element (defaults to 5)
     * @cfg {Number} maxWidth The maximum width for the element (defaults to 10000)
     * @cfg {Number} maxHeight The maximum height for the element (defaults to 10000)
     * @cfg {Boolean} enabled False to disable resizing (defaults to true)
     * @cfg {Boolean} wrap True to wrap an element with a div if needed (required for textareas and images, defaults to false)
     * @cfg {Number} width The width of the element in pixels (defaults to null)
     * @cfg {Number} height The height of the element in pixels (defaults to null)
     * @cfg {Boolean} animate True to animate the resize (not compatible with dynamic sizing, defaults to false)
     * @cfg {Number} duration Animation duration if animate = true (defaults to .35)
     * @cfg {Boolean} dynamic True to resize the element while dragging instead of using a proxy (defaults to false)
     * @cfg {String} handles String consisting of the resize handles to display (defaults to undefined)
     * @cfg {Boolean} multiDirectional <b>Deprecated</b>.  The old style of adding multi-direction resize handles, deprecated
     * in favor of the handles config option (defaults to false)
     * @cfg {Boolean} disableTrackOver True to disable mouse tracking. This is only applied at config time. (defaults to false)
     * @cfg {String} easing Animation easing if animate = true (defaults to 'easingOutStrong')
     * @cfg {Number} widthIncrement The increment to snap the width resize in pixels (dynamic must be true, defaults to 0)
     * @cfg {Number} heightIncrement The increment to snap the height resize in pixels (dynamic must be true, defaults to 0)
     * @cfg {Boolean} pinned True to ensure that the resize handles are always visible, false to display them only when the
     * user mouses over the resizable borders. This is only applied at config time. (defaults to false)
     * @cfg {Boolean} preserveRatio True to preserve the original ratio between height and width during resize (defaults to false)
     * @cfg {Boolean} transparent True for transparent handles. This is only applied at config time. (defaults to false)
     * @cfg {Number} minX The minimum allowed page X for the element (only used for west resizing, defaults to 0)
     * @cfg {Number} minY The minimum allowed page Y for the element (only used for north resizing, defaults to 0)
     * @cfg {Boolean} draggable Convenience to initialize drag drop (defaults to false)
     * @constructor
     * Create a new resizable component
     * @param {String/HTMLElement/Ext.Element} el The id or element to resize
     * @param {Object} config configuration options
      */
    Ext.Resizable = function(el, config){
        this.el = Ext.get(el);

        if(config && config.wrap){
            config.resizeChild = this.el;
            this.el = this.el.wrap(typeof config.wrap == "object" ? config.wrap : {cls:"xresizable-wrap"});
            this.el.id = this.el.dom.id = config.resizeChild.id + "-rzwrap";
            this.el.setStyle("overflow", "hidden");
            this.el.setPositioning(config.resizeChild.getPositioning());
            config.resizeChild.clearPositioning();
            if(!config.width || !config.height){
                var csize = config.resizeChild.getSize();
                this.el.setSize(csize.width, csize.height);
            }
            if(config.pinned && !config.adjustments){
                config.adjustments = "auto";
            }
        }

        this.proxy = this.el.createProxy({tag: "div", cls: "x-resizable-proxy", id: this.el.id + "-rzproxy"});
        this.proxy.unselectable();
        this.proxy.enableDisplayMode('block');

        Ext.apply(this, config);

        if(this.pinned){
            this.disableTrackOver = true;
            this.el.addClass("x-resizable-pinned");
        }
        // if the element isn't positioned, make it relative
        var position = this.el.getStyle("position");
        if(position != "absolute" && position != "fixed"){
            this.el.setStyle("position", "relative");
        }
        if(!this.handles){ // no handles passed, must be legacy style
            this.handles = 's,e,se';
            if(this.multiDirectional){
                this.handles += ',n,w';
            }
        }
        if(this.handles == "all"){
            this.handles = "n s e w ne nw se sw";
        }
        var hs = this.handles.split(/\s*?[,;]\s*?| /);
        var ps = Ext.Resizable.positions;
        for(var i = 0, len = hs.length; i < len; i++){
            if(hs[i] && ps[hs[i]]){
                var pos = ps[hs[i]];
                this[pos] = new Ext.Resizable.Handle(this, pos, this.disableTrackOver, this.transparent);
            }
        }
        // legacy
        this.corner = this.southeast;

        if(this.handles.indexOf("n") != -1 || this.handles.indexOf("w") != -1){
            this.updateBox = true;
        }

        this.activeHandle = null;

        if(this.resizeChild){
            if(typeof this.resizeChild == "boolean"){
                this.resizeChild = Ext.get(this.el.dom.firstChild, true);
            }else{
                this.resizeChild = Ext.get(this.resizeChild, true);
            }
        }

        if(this.adjustments == "auto"){
            var rc = this.resizeChild;
            var hw = this.west, he = this.east, hn = this.north, hs = this.south;
            if(rc && (hw || hn)){
                rc.position("relative");
                rc.setLeft(hw ? hw.el.getWidth() : 0);
                rc.setTop(hn ? hn.el.getHeight() : 0);
            }
            this.adjustments = [
                (he ? -he.el.getWidth() : 0) + (hw ? -hw.el.getWidth() : 0),
                (hn ? -hn.el.getHeight() : 0) + (hs ? -hs.el.getHeight() : 0) -1
            ];
        }

        if(this.draggable){
            this.dd = this.dynamic ?
                this.el.initDD(null) : this.el.initDDProxy(null, {dragElId: this.proxy.id});
            this.dd.setHandleElId(this.resizeChild ? this.resizeChild.id : this.el.id);
        }

        // public events
        this.addEvents({
            /**
             * @event beforeresize
             * Fired before resize is allowed. Set enabled to false to cancel resize.
             * @param {Ext.Resizable} this
             * @param {Ext.EventObject} e The mousedown event
             */
            "beforeresize" : true,
            /**
             * @event resize
             * Fired after a resize.
             * @param {Ext.Resizable} this
             * @param {Number} width The new width
             * @param {Number} height The new height
             * @param {Ext.EventObject} e The mouseup event
             */
            "resize" : true
        });

        if(this.width !== null && this.height !== null){
            this.resizeTo(this.width, this.height);
        }else{
            this.updateChildSize();
        }
        if(Ext.isIE){
            this.el.dom.style.zoom = 1;
        }
        Ext.Resizable.superclass.constructor.call(this);
    };

    Ext.extend(Ext.Resizable, Ext.util.Observable, {
            resizeChild : false,
            adjustments : [0, 0],
            minWidth : 5,
            minHeight : 5,
            maxWidth : 10000,
            maxHeight : 10000,
            enabled : true,
            animate : false,
            duration : .35,
            dynamic : false,
            handles : false,
            multiDirectional : false,
            disableTrackOver : false,
            easing : 'easeOutStrong',
            widthIncrement : 0,
            heightIncrement : 0,
            pinned : false,
            width : null,
            height : null,
            preserveRatio : false,
            transparent: false,
            minX: 0,
            minY: 0,
            draggable: false,

            /**
             * @cfg {String/HTMLElement/Element} constrainTo Constrain the resize to a particular element
             */
            constrainTo: undefined,
            /**
             * @cfg {Ext.lib.Region} resizeRegion Constrain the resize to a particular region
             */
            resizeRegion: undefined,

        /**
         * Perform a manual resize
         * @param {Number} width
         * @param {Number} height
         */
        resizeTo : function(width, height){
            this.el.setSize(width, height);
            this.updateChildSize();
            this.fireEvent("resize", this, width, height, null);
        },

        // private
        startSizing : function(e, handle){
            this.fireEvent("beforeresize", this, e);
            if(this.enabled){ // 2nd enabled check in case disabled before beforeresize handler

                if(!this.overlay){
                    this.overlay = this.el.createProxy({tag: "div", cls: "x-resizable-overlay", html: "&#160;"});
                    this.overlay.unselectable();
                    this.overlay.enableDisplayMode("block");
                    this.overlay.on("mousemove", this.onMouseMove, this);
                    this.overlay.on("mouseup", this.onMouseUp, this);
                }
                this.overlay.setStyle("cursor", handle.el.getStyle("cursor"));

                this.resizing = true;
                this.startBox = this.el.getBox();
                this.startPoint = e.getXY();
                this.offsets = [(this.startBox.x + this.startBox.width) - this.startPoint[0],
                                (this.startBox.y + this.startBox.height) - this.startPoint[1]];

                this.overlay.setSize(Ext.lib.Dom.getViewWidth(true), Ext.lib.Dom.getViewHeight(true));
                this.overlay.show();

                if(this.constrainTo) {
                    var ct = Ext.get(this.constrainTo);
                    this.resizeRegion = ct.getRegion().adjust(
                        ct.getFrameWidth('t'),
                        ct.getFrameWidth('l'),
                        -ct.getFrameWidth('b'),
                        -ct.getFrameWidth('r')
                    );
                }

                this.proxy.setStyle('visibility', 'hidden'); // workaround display none
                this.proxy.show();
                this.proxy.setBox(this.startBox);
                if(!this.dynamic){
                    this.proxy.setStyle('visibility', 'visible');
                }
            }
        },

        // private
        onMouseDown : function(handle, e){
            if(this.enabled){
                e.stopEvent();
                this.activeHandle = handle;
                this.startSizing(e, handle);
            }
        },

        // private
        onMouseUp : function(e){
            var size = this.resizeElement();
            this.resizing = false;
            this.handleOut();
            this.overlay.hide();
            this.proxy.hide();
            this.fireEvent("resize", this, size.width, size.height, e);
        },

        // private
        updateChildSize : function(){
            if(this.resizeChild){
                var el = this.el;
                var child = this.resizeChild;
                var adj = this.adjustments;
                if(el.dom.offsetWidth){
                    var b = el.getSize(true);
                    child.setSize(b.width+adj[0], b.height+adj[1]);
                }
                // Second call here for IE
                // The first call enables instant resizing and
                // the second call corrects scroll bars if they
                // exist
                if(Ext.isIE){
                    setTimeout(function(){
                        if(el.dom.offsetWidth){
                            var b = el.getSize(true);
                            child.setSize(b.width+adj[0], b.height+adj[1]);
                        }
                    }, 10);
                }
            }
        },

        // private
        snap : function(value, inc, min){
            if(!inc || !value) return value;
            var newValue = value;
            var m = value % inc;
            if(m > 0){
                if(m > (inc/2)){
                    newValue = value + (inc-m);
                }else{
                    newValue = value - m;
                }
            }
            return Math.max(min, newValue);
        },

        // private
        resizeElement : function(){
            var box = this.proxy.getBox();
            if(this.updateBox){
                this.el.setBox(box, false, this.animate, this.duration, null, this.easing);
            }else{
                this.el.setSize(box.width, box.height, this.animate, this.duration, null, this.easing);
            }
            this.updateChildSize();
            if(!this.dynamic){
                this.proxy.hide();
            }
            return box;
        },

        // private
        constrain : function(v, diff, m, mx){
            if(v - diff < m){
                diff = v - m;
            }else if(v - diff > mx){
                diff = mx - v;
            }
            return diff;
        },

        // private
        onMouseMove : function(e){
            if(this.enabled){
                try{// try catch so if something goes wrong the user doesn't get hung

                if(this.resizeRegion && !this.resizeRegion.contains(e.getPoint())) {
                	return;
                }

                //var curXY = this.startPoint;
                var curSize = this.curSize || this.startBox;
                var x = this.startBox.x, y = this.startBox.y;
                var ox = x, oy = y;
                var w = curSize.width, h = curSize.height;
                var ow = w, oh = h;
                var mw = this.minWidth, mh = this.minHeight;
                var mxw = this.maxWidth, mxh = this.maxHeight;
                var wi = this.widthIncrement;
                var hi = this.heightIncrement;

                var eventXY = e.getXY();
                var diffX = -(this.startPoint[0] - Math.max(this.minX, eventXY[0]));
                var diffY = -(this.startPoint[1] - Math.max(this.minY, eventXY[1]));

                var pos = this.activeHandle.position;

                switch(pos){
                    case "east":
                        w += diffX;
                        w = Math.min(Math.max(mw, w), mxw);
                        break;
                    case "south":
                        h += diffY;
                        h = Math.min(Math.max(mh, h), mxh);
                        break;
                    case "southeast":
                        w += diffX;
                        h += diffY;
                        w = Math.min(Math.max(mw, w), mxw);
                        h = Math.min(Math.max(mh, h), mxh);
                        break;
                    case "north":
                        diffY = this.constrain(h, diffY, mh, mxh);
                        y += diffY;
                        h -= diffY;
                        break;
                    case "west":
                        diffX = this.constrain(w, diffX, mw, mxw);
                        x += diffX;
                        w -= diffX;
                        break;
                    case "northeast":
                        w += diffX;
                        w = Math.min(Math.max(mw, w), mxw);
                        diffY = this.constrain(h, diffY, mh, mxh);
                        y += diffY;
                        h -= diffY;
                        break;
                    case "northwest":
                        diffX = this.constrain(w, diffX, mw, mxw);
                        diffY = this.constrain(h, diffY, mh, mxh);
                        y += diffY;
                        h -= diffY;
                        x += diffX;
                        w -= diffX;
                        break;
                   case "southwest":
                        diffX = this.constrain(w, diffX, mw, mxw);
                        h += diffY;
                        h = Math.min(Math.max(mh, h), mxh);
                        x += diffX;
                        w -= diffX;
                        break;
                }

                var sw = this.snap(w, wi, mw);
                var sh = this.snap(h, hi, mh);
                if(sw != w || sh != h){
                    switch(pos){
                        case "northeast":
                            y -= sh - h;
                        break;
                        case "north":
                            y -= sh - h;
                            break;
                        case "southwest":
                            x -= sw - w;
                        break;
                        case "west":
                            x -= sw - w;
                            break;
                        case "northwest":
                            x -= sw - w;
                            y -= sh - h;
                        break;
                    }
                    w = sw;
                    h = sh;
                }

                if(this.preserveRatio){
                    switch(pos){
                        case "southeast":
                        case "east":
                            h = oh * (w/ow);
                            h = Math.min(Math.max(mh, h), mxh);
                            w = ow * (h/oh);
                           break;
                        case "south":
                            w = ow * (h/oh);
                            w = Math.min(Math.max(mw, w), mxw);
                            h = oh * (w/ow);
                            break;
                        case "northeast":
                            w = ow * (h/oh);
                            w = Math.min(Math.max(mw, w), mxw);
                            h = oh * (w/ow);
                        break;
                        case "north":
                            var tw = w;
                            w = ow * (h/oh);
                            w = Math.min(Math.max(mw, w), mxw);
                            h = oh * (w/ow);
                            x += (tw - w) / 2;
                            break;
                        case "southwest":
                            h = oh * (w/ow);
                            h = Math.min(Math.max(mh, h), mxh);
                            var tw = w;
                            w = ow * (h/oh);
                            x += tw - w;
                            break;
                        case "west":
                            var th = h;
                            h = oh * (w/ow);
                            h = Math.min(Math.max(mh, h), mxh);
                            y += (th - h) / 2;
                            var tw = w;
                            w = ow * (h/oh);
                            x += tw - w;
                           break;
                        case "northwest":
                            var tw = w;
                            var th = h;
                            h = oh * (w/ow);
                            h = Math.min(Math.max(mh, h), mxh);
                            w = ow * (h/oh);
                            y += th - h;
                             x += tw - w;
                           break;

                    }
                }
                this.proxy.setBounds(x, y, w, h);
                if(this.dynamic){
                    this.resizeElement();
                }
                }catch(e){}
            }
        },

        // private
        handleOver : function(){
            if(this.enabled){
                this.el.addClass("x-resizable-over");
            }
        },

        // private
        handleOut : function(){
            if(!this.resizing){
                this.el.removeClass("x-resizable-over");
            }
        },

        /**
         * Returns the element this component is bound to.
         * @return {Ext.Element}
         */
        getEl : function(){
            return this.el;
        },

        /**
         * Returns the resizeChild element (or null).
         * @return {Ext.Element}
         */
        getResizeChild : function(){
            return this.resizeChild;
        },

        /**
         * Destroys this resizable. If the element was wrapped and
         * removeEl is not true then the element remains.
         * @param {Boolean} removeEl (optional) true to remove the element from the DOM
         */
        destroy : function(removeEl){
            this.proxy.remove();
            if(this.overlay){
                this.overlay.removeAllListeners();
                this.overlay.remove();
            }
            var ps = Ext.Resizable.positions;
            for(var k in ps){
                if(typeof ps[k] != "function" && this[ps[k]]){
                    var h = this[ps[k]];
                    h.el.removeAllListeners();
                    h.el.remove();
                }
            }
            if(removeEl){
                this.el.update("");
                this.el.remove();
            }
        }
    });

    // private
    // hash to map config positions to true positions
    Ext.Resizable.positions = {
        n: "north", s: "south", e: "east", w: "west", se: "southeast", sw: "southwest", nw: "northwest", ne: "northeast"
    };

    // private
    Ext.Resizable.Handle = function(rz, pos, disableTrackOver, transparent){
        if(!this.tpl){
            // only initialize the template if resizable is used
            var tpl = Ext.DomHelper.createTemplate(
                {tag: "div", cls: "x-resizable-handle x-resizable-handle-{0}"}
            );
            tpl.compile();
            Ext.Resizable.Handle.prototype.tpl = tpl;
        }
        this.position = pos;
        this.rz = rz;
        this.el = this.tpl.append(rz.el.dom, [this.position], true);
        this.el.unselectable();
        if(transparent){
            this.el.setOpacity(0);
        }
        this.el.on("mousedown", this.onMouseDown, this);
        if(!disableTrackOver){
            this.el.on("mouseover", this.onMouseOver, this);
            this.el.on("mouseout", this.onMouseOut, this);
        }
    };

    // private
    Ext.Resizable.Handle.prototype = {
        afterResize : function(rz){
            // do nothing
        },
        // private
        onMouseDown : function(e){
            this.rz.onMouseDown(this, e);
        },
        // private
        onMouseOver : function(e){
            this.rz.handleOver(this, e);
        },
        // private
        onMouseOut : function(e){
            this.rz.handleOut(this, e);
        }
    };

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