_layoutwidget.js

这是一个ajax的例子大家好好的看看就是一个鱼眼的效果

if(!dojo._hasResource["dijit.layout._LayoutWidget"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dijit.layout._LayoutWidget"] = true;
dojo.provide("dijit.layout._LayoutWidget");

dojo.require("dijit._Widget");
dojo.require("dijit._Container");

dojo.declare("dijit.layout._LayoutWidget",
	[dijit._Widget, dijit._Container, dijit._Contained],
	{
		// summary
		//		Mixin for widgets that contain a list of children like SplitContainer.
		//		Widgets which mixin this code must define layout() to lay out the children

		isLayoutContainer: true,

		postCreate: function(){
			dojo.addClass(this.domNode, "dijitContainer");
		},

		startup: function(){
			// summary:
			//		Called after all the widgets have been instantiated and their
			//		dom nodes have been inserted somewhere under dojo.doc.body.
			//
			//		Widgets should override this method to do any initialization
			//		dependent on other widgets existing, and then call
			//		this superclass method to finish things off.
			//
			//		startup() in subclasses shouldn't do anything
			//		size related because the size of the widget hasn't been set yet.

			if(this._started){ return; }

			dojo.forEach(this.getChildren(), function(child){ child.startup(); });

			// If I am a top level widget
			if(!this.getParent || !this.getParent()){
				// Do recursive sizing and layout of all my descendants
				// (passing in no argument to resize means that it has to glean the size itself)
				this.resize();

				// since my parent isn't a layout container, and my style is width=height=100% (or something similar),
				// then I need to watch when the window resizes, and size myself accordingly
				// (passing in no argument to resize means that it has to glean the size itself)
				this.connect(window, 'onresize', function(){this.resize();});
			}
			
			this.inherited(arguments);
		},

		resize: function(args){
			// summary:
			//		Explicitly set this widget's size (in pixels),
			//		and then call layout() to resize contents (and maybe adjust child widgets)
			//	
			// args: Object?
			//		{w: int, h: int, l: int, t: int}

			var node = this.domNode;

			// set margin box size, unless it wasn't specified, in which case use current size
			if(args){
				dojo.marginBox(node, args);

				// set offset of the node
				if(args.t){ node.style.top = args.t + "px"; }
				if(args.l){ node.style.left = args.l + "px"; }
			}
			// If either height or width wasn't specified by the user, then query node for it.
			// But note that setting the margin box and then immediately querying dimensions may return
			// inaccurate results, so try not to depend on it.
			var mb = dojo.mixin(dojo.marginBox(node), args||{});

//			console.log(this, ": setting size to ", mb);

			// Save the size of my content box.
			this._contentBox = dijit.layout.marginBox2contentBox(node, mb);

			// Callback for widget to adjust size of it's children
			this.layout();
		},

		layout: function(){
			//	summary
			//		Widgets override this method to size & position their contents/children.
			//		When this is called this._contentBox is guaranteed to be set (see resize()).
			//
			//		This is called after startup(), and also when the widget's size has been
			//		changed.
		}
	}
);

dijit.layout.marginBox2contentBox = function(/*DomNode*/ node, /*Object*/ mb){
	// summary:
	//		Given the margin-box size of a node, return it's content box size.
	//		Functions like dojo.contentBox() but is more reliable since it doesn't have
	//		to wait for the browser to compute sizes.
	var cs = dojo.getComputedStyle(node);
	var me=dojo._getMarginExtents(node, cs);
	var pb=dojo._getPadBorderExtents(node, cs);
	return {
		l: dojo._toPixelValue(node, cs.paddingLeft),
		t: dojo._toPixelValue(node, cs.paddingTop),
		w: mb.w - (me.w + pb.w),
		h: mb.h - (me.h + pb.h)
	};
};

(function(){
	var capitalize = function(word){
		return word.substring(0,1).toUpperCase() + word.substring(1);
	};

	var size = function(widget, dim){
		// size the child
		widget.resize ? widget.resize(dim) : dojo.marginBox(widget.domNode, dim);

		// record child's size, but favor our own numbers when we have them.
		// the browser lies sometimes
		dojo.mixin(widget, dojo.marginBox(widget.domNode));
		dojo.mixin(widget, dim);
	};

	dijit.layout.layoutChildren = function(/*DomNode*/ container, /*Object*/ dim, /*Object[]*/ children){
		/**
		 * summary
		 *		Layout a bunch of child dom nodes within a parent dom node
		 * container:
		 *		parent node
		 * dim:
		 *		{l, t, w, h} object specifying dimensions of container into which to place children
		 * children:
		 *		an array like [ {domNode: foo, layoutAlign: "bottom" }, {domNode: bar, layoutAlign: "client"} ]
		 */

		// copy dim because we are going to modify it
		dim = dojo.mixin({}, dim);

		dojo.addClass(container, "dijitLayoutContainer");

		// Move "client" elements to the end of the array for layout.  a11y dictates that the author
		// needs to be able to put them in the document in tab-order, but this algorithm requires that
		// client be last.
		children = dojo.filter(children, function(item){ return item.layoutAlign != "client"; })
			.concat(dojo.filter(children, function(item){ return item.layoutAlign == "client"; }));

		// set positions/sizes
		dojo.forEach(children, function(child){
			var elm = child.domNode,
				pos = child.layoutAlign;

			// set elem to upper left corner of unused space; may move it later
			var elmStyle = elm.style;
			elmStyle.left = dim.l+"px";
			elmStyle.top = dim.t+"px";
			elmStyle.bottom = elmStyle.right = "auto";

			dojo.addClass(elm, "dijitAlign" + capitalize(pos));

			// set size && adjust record of remaining space.
			// note that setting the width of a <div> may affect it's height.
			if(pos=="top" || pos=="bottom"){
				size(child, { w: dim.w });
				dim.h -= child.h;
				if(pos=="top"){
					dim.t += child.h;
				}else{
					elmStyle.top = dim.t + dim.h + "px";
				}
			}else if(pos=="left" || pos=="right"){
				size(child, { h: dim.h });
				dim.w -= child.w;
				if(pos=="left"){
					dim.l += child.w;
				}else{
					elmStyle.left = dim.l + dim.w + "px";
				}
			}else if(pos=="client"){
				size(child, dim);
			}
		});
	};

})();

}