www.gusucode.com > 一个基于extjs的强大聊天插件源码程序 > 一个基于extjs的强大聊天插件/extjame/ext-jame/js/ext2/source/widgets/Resizable.js
/*
* Ext JS Library 2.0.2
* Copyright(c) 2006-2008, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
/**
* @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 {Mixed} 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(
"beforeresize",
"resize"
);
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 {Mixed} constrainTo Constrain the resize to a particular element
*/
/**
* @cfg {Ext.lib.Region} resizeRegion Constrain the resize to a particular region
*/
/**
* @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
*/
/**
* @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
*/
/**
* 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: " "}, Ext.getBody());
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();
}
},
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 = {
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);
}
};