resizable.js

一个struts和extjs得源码

     * class, and should not be called by user code.</p>
     * <p>If a Resizable is being used to resize an Element which encapsulates a more complex UI
     * component such as a Panel, this method may be overridden by specifying an implementation
     * as a config option to provide appropriate behaviour at the end of the resize operation on
     * mouseup, for example resizing the Panel, and relaying the Panel's content.</p>
     * <p>The new area to be resized to is available by examining the state of the {@link #proxy}
     * Element. Example:
<pre><code>
new Ext.Panel({
    title: 'Resize me',
    x: 100,
    y: 100,
    renderTo: Ext.getBody(),
    floating: true,
    frame: true,
    width: 400,
    height: 200,
    listeners: {
        render: function(p) {
            new Ext.Resizable(p.getEl(), {
                handles: 'all',
                pinned: true,
                transparent: true,
                resizeElement: function() {
                    var box = this.proxy.getBox();
                    p.updateBox(box);
                    if (p.layout) {
                        p.doLayout();
                    }
                    return box;
                }
           });
       }
    }
}).show();
</code></pre>
     */
    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){
        if(this.dd){
            this.dd.destroy();
        }
        if(this.overlay){
            Ext.destroy(this.overlay);
            this.overlay = null;
        }
        Ext.destroy(this.proxy);
        this.proxy = null;
        
        var ps = Ext.Resizable.positions;
        for(var k in ps){
            if(typeof ps[k] != "function" && this[ps[k]]){
                this[ps[k]].destroy();
            }
        }
        if(removeEl){
            this.el.update("");
            Ext.destroy(this.el);
            this.el = null;
        }
    },

    syncHandleHeight : function(){
        var h = this.el.getHeight(true);
        if(this.west){
            this.west.el.setHeight(h);
        }
        if(this.east){
            this.east.el.setHeight(h);
        }
    }
});

// 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 = {
    // private
    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);
    },
    // private
    destroy : function(){
        Ext.destroy(this.el);
        this.el = null;
    }
};