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/ColumnLayout.js
/* * Ext JS Library 2.0.2 * Copyright(c) 2006-2008, Ext JS, LLC. * licensing@extjs.com * * http://extjs.com/license */ /** * @class Ext.layout.ColumnLayout * @extends Ext.layout.ContainerLayout * <p>This is the layout style of choice for creating structural layouts in a multi-column format where the width of * each column can be specified as a percentage or fixed width, but the height is allowed to vary based on the content. * This class is intended to be extended or created via the layout:'column' {@link Ext.Container#layout} config, * and should generally not need to be created directly via the new keyword.</p> * <p>ColumnLayout does not have any direct config options (other than inherited ones), but it does support a * specific config property of <b>columnWidth</b> that can be included in the config of any panel added to it. The * layout will use the width (if pixels) or columnWidth (if percent) of each panel during layout to determine how to size each panel. * If width or columnWidth is not specified for a given panel, its width will default to the panel's width (or auto).</p> * <p>The width property is always evaluated as pixels, and must be a number greater than or equal to 1. * The columnWidth property is always evaluated as a percentage, and must be a decimal value greater than 0 and * less than 1 (e.g., .25).</p> * <p>The basic rules for specifying column widths are pretty simple. The logic makes two passes through the * set of contained panels. During the first layout pass, all panels that either have a fixed width or none * specified (auto) are skipped, but their widths are subtracted from the overall container width. During the second * pass, all panels with columnWidths are assigned pixel widths in proportion to their percentages based on * the total <b>remaining</b> container width. In other words, percentage width panels are designed to fill the space * left over by all the fixed-width or auto-width panels. Because of this, while you can specify any number of columns * with different percentages, the columnWidths must always add up to 1 (or 100%) when added together, otherwise your * layout may not render as expected. Example usage:</p> * <pre><code> // All columns are percentages -- they must add up to 1 var p = new Ext.Panel({ title: 'Column Layout - Percentage Only', layout:'column', items: [{ title: 'Column 1', columnWidth: .25 },{ title: 'Column 2', columnWidth: .6 },{ title: 'Column 3', columnWidth: .15 }] }); // Mix of width and columnWidth -- all columnWidth values values must add // up to 1. The first column will take up exactly 120px, and the last two // columns will fill the remaining container width. var p = new Ext.Panel({ title: 'Column Layout - Mixed', layout:'column', items: [{ title: 'Column 1', width: 120 },{ title: 'Column 2', columnWidth: .8 },{ title: 'Column 3', columnWidth: .2 }] }); </code></pre> */ Ext.layout.ColumnLayout = Ext.extend(Ext.layout.ContainerLayout, { // private monitorResize:true, // private extraCls: 'x-column', scrollOffset : 0, // private isValidParent : function(c, target){ return c.getEl().dom.parentNode == this.innerCt.dom; }, // private onLayout : function(ct, target){ var cs = ct.items.items, len = cs.length, c, i; if(!this.innerCt){ target.addClass('x-column-layout-ct'); // the innerCt prevents wrapping and shuffling while // the container is resizing this.innerCt = target.createChild({cls:'x-column-inner'}); this.innerCt.createChild({cls:'x-clear'}); } this.renderAll(ct, this.innerCt); var size = target.getViewSize(); if(size.width < 1 && size.height < 1){ // display none? return; } var w = size.width - target.getPadding('lr') - this.scrollOffset, h = size.height - target.getPadding('tb'), pw = w; this.innerCt.setWidth(w); // some columns can be percentages while others are fixed // so we need to make 2 passes for(i = 0; i < len; i++){ c = cs[i]; if(!c.columnWidth){ pw -= (c.getSize().width + c.getEl().getMargins('lr')); } } pw = pw < 0 ? 0 : pw; for(i = 0; i < len; i++){ c = cs[i]; if(c.columnWidth){ c.setSize(Math.floor(c.columnWidth*pw) - c.getEl().getMargins('lr')); } } } /** * @property activeItem * @hide */ }); Ext.Container.LAYOUTS['column'] = Ext.layout.ColumnLayout;