On Friday, September 9, 2016 at 9:31:27 AM UTC+2, Eddy wrote:
>
> Thank you for your first help Thomas !
>
> What I had tried is to write a get method from the view/display interface,
> which return the suggestBox object and which I had called from the
> presenter on the onBind or revealDisplay :
> => I could redefine as the same the requestSuggestions() into the
> presenter but then I didn't know how to transmit it to the view / how to
> instanciate the visible SuggestBox object for showing it into the view
> (regarding the new SuggestBox(oracle) line).
>
Something like:
in the presenter:
public void getSuggestions(SuggestOracle.Request req,
SuggestOracle.Callback callback) {
service.getSuggestions(req, callback);
}
in the view:
SuggestOracleCustom oracle = new SuggestOracleCustom() {
@Override
public void requestSuggestions(SuggestOracle.Request req,
SuggestOracle.Callback callback) {
presenter.getSuggestions(req, new
SuggestOracleCallbackCustom(req, callback));
}
};
SuggestBox suggestBox = new SuggestBox(oracle);
this.add(suggestBox);
(put the SuggestOracleCallbackCustom where it needs to go, either presenter
or view, depends on what it does)
> Excuses-me but I am not familiar enough by making my own proxy /
> "delegating" etc. Can you give me some sample please ?
>
Something like:
private SuggestOracle realOracle; // set by the presenter
…
SuggestBox suggestBox = new SuggestBox(new SuggestOracle() {
@Override
public boolean isDisplayStringHTML() {
return realOracle.isDisplayStringHTML();
}
@Override
public void requestDefaultSuggestions(SuggestOracle.Request
request, SuggestOracle.Callback callback) {
realOracle.requestDefaultSuggestions(request, callback);
}
@Override
public void requestSuggestions(SuggestOracle.Request req,
SuggestOracle.Callback callback) {
realOracle.requestSuggestions(req, callback);
}
});
this.add(suggestBox);
That way, the realOracle can be replaced at any time, without the need to
re-build the SuggestBox.
The anonymous SuggestOracle passed to the SuggestBox acts as a proxy
(façade) to the 'realOracle' (which is then the proxy's "delegate").
If you need that pattern many times in your application, then create a
DelegatingSuggestOracle similar to the anonymous one but with the
realOracle as a field of the DelegatingSuggestOracle, with getter and
setter. Your view would then read:
private final SuggestOracle oracle = new DelegatingSuggestOracle();
…
SuggestBox suggestBox = new SuggestBox(oracle);
this.add(suggestBox);
…
public void setSuggestOracle(SuggestOracle oracle) { // called by the
presenter
this.oracle.setDelegate(oracle);
}
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