HTML “getElementByID” implementation for SWT widget

问题

In HTML, there is something like document.getElementById("button1");

I would like something of this sort to happen in my SWT application.

Say I created an SWT widget on the run with new Button(shell, SWT.PUSH) Is there anywhere I can get(reference) this object with something similar to getElementById(...)?

I am thinking of creating a HashMap<String, Object> type, where String places the id of the object(Widget) and then I will call hashMap.getKey(id) which will return me a reference to the object(Widget).

回答1:

No, SWT widgets don't have ids or anything similar. Of course, you can do it manually using a map, as you say.

回答2:

There are several possibilities to implement such a functionality without any big efforts. As an example-implementation you can use SWTBot (a GUI-Testing API for SWT) that has several methods to "find" Widgets by a given id.

Download the SWTBot Source-Code (see http://wiki.eclipse.org/SWTBot/Contributing#Getting_the_source) and take a look for example at org.eclipse.swtbot.swt.finder.SWTBot.buttonWithId(String, String, int) If you navigate through the implementation you'll get an idea how this can be implemented...

回答3:

You can recursively check all the children of a composite with a method like this one, and use Widget.getData()/setData() to set an id:

public <T extends Control> T findChild(Composite parent, String id) {
    Control found = null;
    Control[] children = parent.getChildren();
    for (int i = 0; i < children .length && found == null; i++) {
        Control child = children[i];
        if (id.equals(child.getData(ID)) {
            found = child;
        } else if (child instanceof Composite) {
            found = findChild((Composite) child, id);
        }
    }
    return (T) found ;
}

来源：https://stackoverflow.com/questions/11735485/html-getelementbyid-implementation-for-swt-widget

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java

swt