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gwt access rootpanel from outside of onModuleLoad

开发者 https://www.devze.com 2022-12-13 17:54 出处:网络
I can use removeFromParent to get rid of something on the RootPanel from a class that doesnt have onModuleLoad in it. However, can you add a widgetto the RootPanel from another class? I cannot figure

I can use removeFromParent to get rid of something on the RootPanel from a class that doesnt have onModuleLoad in it. However, can you add a widget to the RootPanel from another class? I cannot figure out how to do so. So for example:

public classA extends EntryPoint{

public void onModuleLoad(){

MyPanel panel = new MyPanel();
RootPanel.get("a").add(panel);

}

}

Then inside the MyPanel class inside an onclick actions I would want to do this:

Object s = event.getSource();
Button sButton = (Button)s;
sButton.getParent().removeFromParent();

this works, but now we have remove panel fro开发者_如何转开发m from the rootpanel, and I want to replace it with a new panel. How do I do that from this other class. I am not sure if I have to access RootPanel, which seems to be not possible, or if I need to have another entryPoint which doesn't seem to make sense. Any advice would be appreciated.


Add this code in your MyPanel class.I haven't tried this code.But it should work.Call the buttonClicked method from onClick method

private void buttonCLicked(){
     for(int i=0;i<RootPanel.get("a").getWidgetCount();i++){
         if(RootPanel.get("a").getWidget(i) .equals(this)){
             RootPanel.get("a").remove(i);
             RootPanel.get("a").add(newPanel);
             break;
        }
     }
 }


For some reason when I started using gwt I thought that RootPanel was inaccessible from outside EntryPoint.onModuleLoad() but it is as long as you import RootPanel. I would be interested to know why you thought this because I don't remember why I once thought the same thing. Either way you have two options:

One is just:

Object s = event.getSource();
Button sButton = (Button)s;
sButton.getParent().removeFromParent();
RootPanel.get("a").add(nextPanel);

The other is if you actually wanted to access something that was inaccessible (which like I mentioned RootPanel is perfectly accessible) you could just create a method to access it. So if you truley couldn't access RootPanel outside of onModuleLoad() you could do something like the following:

RootPanel root = null;

public static RootPanel getRootPanel(){
    return root;
    }

public void onModuleLoad(){

root = RootPanel.get("a");
...
        }

and then in whatever class you would like you could just say:

ClassA.getRootPanel().add(Whatever Widget);
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