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/**
* Copyright 2010 ArcBees Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.gwtplatform.mvp.client;
import com.google.gwt.event.shared.EventBus;
import com.google.inject.Singleton;
import com.gwtplatform.mvp.client.proxy.PlaceRequest;
import com.gwtplatform.mvp.client.proxy.Proxy;
/**
* A singleton presenter, the basic building block of the
*
* model-view-presenter architecture. Each logical page of your application will usually
* correspond to a singleton {@link Presenter}. If you need to separate logic from view
* in a simple graphical component, you might consider using a {@link PresenterWidget}.
*
* For more details on the hierarchical organization of presenters, see {@link PresenterWidget}.
*
* Each presenter is associated to a {@link Proxy} which is responsible for listening to the
* various events of interest for this presenter. This makes it possible to lazily instantiate
* the presenter and use GWT code splitting. Proxies are automatically generated for you
* based on the information contained in the presenter. For this purpose, your presenter has to
* define an embedded interface extending {@link Proxy} or
* {@link com.gwtplatform.mvp.client.proxy.ProxyPlace ProxyPlace}. Then you should apply various
* annotations to that interface in order to specify the characteristics of your presenter. For example,
* the following code indicates that the presenter will use GWT code splitting and will be
* reachable at url {@code http://mydomain.com#main}:
*
* One of {@link com.gwtplatform.mvp.client.annotations.ProxyStandard ProxyStandard},
* {@link com.gwtplatform.mvp.client.annotations.ProxyCodeSplit ProxyCodeSplit} or
* {@link com.gwtplatform.mvp.client.annotations.ProxyCodeSplitBundle ProxyCodeSplitBundle}
* must always annotate the {@link Proxy} interface.
*
* To reveal a presenter associated to a {@link com.gwtplatform.mvp.client.proxy.ProxyPlace ProxyPlace}
* you can simply navigate to an hyperlink corresponding to this place's name token. The
* {@link com.gwtplatform.mvp.client.proxy.PlaceManager PlaceManager} offers a number of method for building
* such hyperlinks. If you want to reveal it programatically, you should build a
* {@link com.gwtplatform.mvp.client.proxy.PlaceRequest PlaceRequest} and call one of the
* following method:
*
* If the presenter is associated to a regular {@link Proxy} and does not have
* a name token then you should call the {@link #forceReveal()} method. For such
* presenters, it is customary to define an event responsible of revealing them in
* order to enforce loose coupling. This event is then handled by the presenter
* using the {@link com.gwtplatform.mvp.client.annotations.ProxyEvent ProxyEvent}
* mechanism.
*
* If the presenter is revealed and is not currently visible, then its {@link #revealInParent()} method
* will be called.
*
* To hide a presenter, you can reveal another one in the same slot or you can use
* one of the methods described in {@link PresenterWidget}.
*
* A presenter has a number of lifecycle methods that you can hook on to:
*
*
{@link #onBind()}
*
{@link #onReveal()}
*
{@link #onReset()}
*
{@link #onHide()}
*
{@link #onUnbind()}
*
* Revealing or hiding a {@link PresenterWidget} triggers an internal chain of events that result
* in these lifecycle methods being called. For an example, here is what happens when a presenter
* is revealed (either via {@link #forceReveal()}, or through a
* {@link com.gwtplatform.mvp.client.proxy.PlaceManager PlaceManager} method):
*
*
The presenter's {@link #revealInParent()} is call ant it asks to be set in one of its
* parent slot by firing a
* {@link com.gwtplatform.mvp.client.proxy.RevealContentEvent RevealContentEvent}
*
If a presenter already occupies this slot it is removed.
*
If the presenter owning the slot is currently visible then
* {@link #onHide()} is called on the removed presenter and, recursively,
* on its children (bottom-up: first the children, then the parent)
*
If the parent is not visible, it asks to be set in one of its parent slot
* by firing a {@link com.gwtplatform.mvp.client.proxy.RevealContentEvent RevealContentEvent}
* too, this continues recursively until a visible presenter is reached, or until a presenter fires
* {@link com.gwtplatform.mvp.client.proxy.RevealRootContentEvent RevealRootContentEvent}
* or {@link com.gwtplatform.mvp.client.proxy.RevealRootLayoutContentEvent RevealRootLayoutContentEvent}
*
*
When the above chain stops, {@link #onReveal} is called on all the presenters
* that were traversed. (top down: first the parent, then the children);
*
Finally {@link #onReset()} is called on all the
* currently visible presenters (top-down: first the parent, then
* the children).
*
* @param The {@link View} type.
* @param The {@link Proxy} type.
*
* @author Philippe Beaudoin
* @author Christian Goudreau
*/
@Singleton
public abstract class Presenter> extends PresenterWidget {
/**
* The light-weight {@Proxy} around this presenter.
*/
private final Proxy_ proxy;
/**
* Creates a {@link Presenter} that is not necessarily using automatic
* binding. Automatic binding will only work when instantiating this object using
* Guice/GIN dependency injection. See
* {@link HandlerContainerImpl#HandlerContainerImpl(boolean)} for
* more details on automatic binding.
*
* @param autoBind {@code true} to request automatic binding, {@code false} otherwise.
* @param eventBus The {@link EventBus}.
* @param view The {@link View}.
* @param proxy The {@link Proxy}.
*/
public Presenter(boolean autoBind, EventBus eventBus, V view, Proxy_ proxy) {
super(eventBus, view);
this.proxy = proxy;
}
/**
* Creates a {@link Presenter} that uses automatic binding. This will
* only work when instantiating this object using Guice/GIN dependency injection.
* See {@link HandlerContainerImpl#HandlerContainerImpl()} for more details on
* automatic binding.
*
* @param eventBus The {@link EventBus}.
* @param view The {@link View}.
* @param proxy The {@link Proxy}.
*/
public Presenter(EventBus eventBus, V view, Proxy_ proxy) {
super(eventBus, view);
this.proxy = proxy;
}
/**
* Reveals the presenter, bypassing any service offered by the
* {@link com.gwtplatform.mvp.client.proxy.PlaceManager PlaceManager}.
* Since this method bypasses the {@link com.gwtplatform.mvp.client.proxy.PlaceManager PlaceManager}
* it will not:
*
*
Update the browser history
*
Check accessibility via the {@link com.gwtplatform.mvp.client.proxy.Gatekeeper Gatekeeper}
*
Setup the presenter via {@link #prepareFromRequest(PlaceRequest)}
*
Uses the leave confirmation mechanism (see {@link com.gwtplatform.mvp.client.proxy.PlaceManager#setOnLeaveConfirmation(String) PlaceManager.setOnLeaveConfirmation})
*
* Therefore, to reveal a presenter associated to a {@link com.gwtplatform.mvp.client.proxy.ProxyPlace ProxyPlace}
* use one of the method provided by the {@link com.gwtplatform.mvp.client.proxy.PlaceManager PlaceManager}.
* For more details see {@link Presenter}.
*/
public final void forceReveal() {
if (isVisible()) {
return;
}
revealInParent();
}
/**
* Returns the {@link Proxy} attached to this presenter.
*
* @return The {@link Proxy}.
*/
public final Proxy_ getProxy() {
return proxy;
}
/**
* Verifies if this presenter can be revealed automatically or if it is meant to be
* revealed manually.
* Normally, the user wants to reveal a presenter manually when it cannot be used
* until some data is received from the server. For example, a form
* to edit client details is unusable until all the data for this user has been
* received. Fetching this data should be done in the {@link #prepareFromRequest(PlaceRequest)}
* method.
*
* In order to use manual reveal, override this method to return {@code true}.
* Then, in your {@link #prepareFromRequest}, you can either:
*
*
Fetch the data using a {@link com.gwtplatform.mvp.client.proxy.ManualRevealCallback ManualRevealCallback},
* which will automatically reveal the presenter upon success.
*
Fetch the data by any other mean and call
* {@link com.gwtplatform.mvp.client.proxy.ProxyPlace#manualReveal(Presenter)} when
* your data is available. In this case you also have to call
* {@link com.gwtplatform.mvp.client.proxy.ProxyPlace#manualRevealFailed()}
* if loading fails, otherwise your application will become unusable.
*
* The default implementation uses automatic reveal, and therefore returns {@code false}.
*
* @return {@code true} if you want to use manual reveal, or {@code false} to use
* automatic reveal.
*/
public boolean useManualReveal() {
return false;
}
/**
* Prepare the state of the presenter given the information contained in
* the {@link PlaceRequest}. This method is called when the
* {@link com.gwtplatform.mvp.client.proxy.PlaceManager PlaceManager} navigates
* to this {@link Presenter}. You should override the method to extract any
* parameters you need from the request. Make sure you call your parent's
* {@link #prepareFromRequest} method.
*
* If your presenter needs to fetch some information from the server while
* preparing itself, consider using manual reveal. See {@link #useManualReveal()}.
*
* If your presenter does not handle any parameter and does not want to fetch
* extra information, then there is no need to override this method.
*
* @param request The {@link PlaceRequest}.
*/
public void prepareFromRequest(PlaceRequest request) {
}
/**
* Requests that the presenter reveal itself in its parent presenter.
* You must override this method to either fire a
* {@link com.gwtplatform.mvp.client.proxy.RevealContentEvent RevealContentEvent},
* a {@link com.gwtplatform.mvp.client.proxy.RevealRootContentEvent RevealRootContentEvent}
* or a {@link com.gwtplatform.mvp.client.proxy.RevealRootLayoutContentEvent RevealRootLayoutContentEvent}.
*/
protected abstract void revealInParent();
}
