【zk开发】如何在页面中获得composer对象

 

样例：

 

 

<window id="userWin"  apply="org.sunflower.web.controller.zk.UserController">

上传头像：<button label="上传头像..." upload="true,maxsize=-1,native" 

onUpload="userWin$composer.handleUploadLogo(event.media)"/>

</window>

 

 

 

UserController代码，继承GenericComposer或者其子类

 

 

import org.zkoss.util.media.Media;
import org.zkoss.zk.ui.util.GenericComposer;

public class UserController extends GenericComposer {
	private static final long serialVersionUID = -3801962286418473844L;

	public void handleUploadLogo(Media media) {
		System.out.println(media.getName());
	}
}

 

 

 

疑问：

 

userWin$composer变量从何而来？

 

 

GenericComposer部分源码 

 

 

abstract public class GenericComposer extends GenericEventListener
implements Composer, ComposerExt, java.io.Serializable {
.....................................
 //此处的comp为使用apply=“xxx.xxx.XXXcomposer”属性的组建
//since 3.6.1
	public void doBeforeComposeChildren(Component comp) throws Exception {
		//assign this composer as a variable
		//feature #2778508
		Components.wireController(comp, this); //下一步看wireController方法源码
	}

  ................................

}

 

为了方便，以下不一一说明为某某类的源码，仅贴出相关源码

 

 

1，

 

public static final
	void wireController(Component comp, Object controller, char separator) {
		new Wire(controller, separator).wireController(comp, comp.getId());//下一步看此方法
	}

 

 

 

 

 

 

2， 然后看如下代码，一切都明了了，

 

 

/**
		 * Inject controller as variable of the specified component.
		 */
		private void wireController(Component comp, String id) {
			//feature #2778513, support {id}$composer name
			final String composerid =  id + _separator + "composer";
			if (!comp.hasAttributeOrFellow(composerid, false)) {
				comp.setAttribute(composerid, _controller);
			}
			comp.setAttribute(varname(id, _controller.getClass()), _controller);
		}

 

解释代码

 

 

首先拼接composerid字符串,composerid由comp.getId、_seperator、"composer"组成

其中_seperator的值默认为$,当然可以使用类似Components.wireController(comp, controller, separator);

提供第三个参数的方法修改默认$