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/layout/AnchorLayout.js
/* * Ext JS Library 2.0.2 * Copyright(c) 2006-2008, Ext JS, LLC. * licensing@extjs.com * * http://extjs.com/license */ /** * @class Ext.layout.AnchorLayout * @extends Ext.layout.ContainerLayout * <p>This is a layout that enables anchoring of contained elements relative to the container's dimensions. If * the container is resized, all anchored items are automatically rerendered according to their anchor rules. * This class is intended to be extended or created via the layout:'anchor' {@link Ext.Container#layout} config, * and should generally not need to be created directly via the new keyword.</p> * <p>AnchorLayout does not have any direct config options (other than inherited ones). However, the container * using the AnchorLayout can supply an anchoring-specific config property of <b>anchorSize</b>. By default, * AnchorLayout will calculate anchor measurements based on the size of the container itself. However, if * anchorSize is specifed, the layout will use it as a virtual container for the purposes of calculating anchor * measurements based on it instead, allowing the container to be sized independently of the anchoring logic if necessary.</p> * <p>The items added to an AnchorLayout can also supply an anchoring-specific config property of <b>anchor</b> which * is a string containing two values: the horizontal anchor value and the vertical anchor value (for example, '100% 50%'). * This value is what tells the layout how the item should be anchored to the container. The following types of * anchor values are supported: * <ul> * <li><b>Percentage</b>: Any value between 1 and 100, expressed as a percentage. The first anchor is the percentage * width that the item should take up within the container, and the second is the percentage height. Example: '100% 50%' * would render an item the complete width of the container and 1/2 its height. If only one anchor value is supplied * it is assumed to be the width value and the height will default to auto.</li> * <li><b>Offsets</b>: Any positive or negative integer value. The first anchor is the offset from the right edge of * the container, and the second is the offset from the bottom edge. Example: '-50 -100' would render an item the * complete width of the container minus 50 pixels and the complete height minus 100 pixels. If only one anchor value * is supplied it is assumed to be the right offset value and the bottom offset will default to 0.</li> * <li><b>Sides</b>: Valid values are 'right' (or 'r') and 'bottom' (or 'b'). Either the container must have a fixed * size or an anchorSize config value defined at render time in order for these to have any effect.</li> * </ul> * <p>Anchor values can also be mixed as needed. For example, '-50 75%' would render the width offset from the * container right edge by 50 pixels and 75% of the container's height.</p> */ Ext.layout.AnchorLayout = Ext.extend(Ext.layout.ContainerLayout, { // private monitorResize:true, // private getAnchorViewSize : function(ct, target){ return target.dom == document.body ? target.getViewSize() : target.getStyleSize(); }, // private onLayout : function(ct, target){ Ext.layout.AnchorLayout.superclass.onLayout.call(this, ct, target); var size = this.getAnchorViewSize(ct, target); var w = size.width, h = size.height; if(w < 20 || h < 20){ return; } // find the container anchoring size var aw, ah; if(ct.anchorSize){ if(typeof ct.anchorSize == 'number'){ aw = ct.anchorSize; }else{ aw = ct.anchorSize.width; ah = ct.anchorSize.height; } }else{ aw = ct.initialConfig.width; ah = ct.initialConfig.height; } var cs = ct.items.items, len = cs.length, i, c, a, cw, ch; for(i = 0; i < len; i++){ c = cs[i]; if(c.anchor){ a = c.anchorSpec; if(!a){ // cache all anchor values var vs = c.anchor.split(' '); c.anchorSpec = a = { right: this.parseAnchor(vs[0], c.initialConfig.width, aw), bottom: this.parseAnchor(vs[1], c.initialConfig.height, ah) }; } cw = a.right ? this.adjustWidthAnchor(a.right(w), c) : undefined; ch = a.bottom ? this.adjustHeightAnchor(a.bottom(h), c) : undefined; if(cw || ch){ c.setSize(cw || undefined, ch || undefined); } } } }, // private parseAnchor : function(a, start, cstart){ if(a && a != 'none'){ var last; if(/^(r|right|b|bottom)$/i.test(a)){ // standard anchor var diff = cstart - start; return function(v){ if(v !== last){ last = v; return v - diff; } } }else if(a.indexOf('%') != -1){ var ratio = parseFloat(a.replace('%', ''))*.01; // percentage return function(v){ if(v !== last){ last = v; return Math.floor(v*ratio); } } }else{ a = parseInt(a, 10); if(!isNaN(a)){ // simple offset adjustment return function(v){ if(v !== last){ last = v; return v + a; } } } } } return false; }, // private adjustWidthAnchor : function(value, comp){ return value; }, // private adjustHeightAnchor : function(value, comp){ return value; } /** * @property activeItem * @hide */ }); Ext.Container.LAYOUTS['anchor'] = Ext.layout.AnchorLayout;