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Refactor handling of focus and blur RPC in Connectors (#17917)
Change-Id: I2e4fb3fb941fda2aa4cbc7154fa9a3f7e8e9ce02
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client/src/com/vaadin/client/ui/ConnectorFocusAndBlurHandler.java
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| Original file line number | Original file line | Diff line number | Diff line change |
|---|---|---|---|
| @@ -0,0 +1,87 @@ | |||
| /* | |||
| * Copyright 2000-2014 Vaadin Ltd. | |||
| * | |||
| * 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.vaadin.client.ui; | |||
|
|
|||
| import com.google.gwt.event.dom.client.BlurEvent; | |||
| import com.google.gwt.event.dom.client.BlurHandler; | |||
| import com.google.gwt.event.dom.client.FocusEvent; | |||
| import com.google.gwt.event.dom.client.FocusHandler; | |||
| import com.google.gwt.event.shared.HandlerRegistration; | |||
| import com.google.gwt.user.client.ui.Widget; | |||
| import com.vaadin.client.EventHelper; | |||
| import com.vaadin.client.communication.StateChangeEvent; | |||
| import com.vaadin.client.communication.StateChangeEvent.StateChangeHandler; | |||
| import com.vaadin.shared.EventId; | |||
| import com.vaadin.shared.communication.FieldRpc.FocusAndBlurServerRpc; | |||
|
|
|||
| /** | |||
| * A handler for focus and blur events which uses {@link FocusAndBlurServerRpc} | |||
| * to transmit received events to the server. Events are only handled if there | |||
| * is a corresponding listener on the server side. | |||
| * | |||
| * @since | |||
| * @author Vaadin Ltd | |||
| */ | |||
| public class ConnectorFocusAndBlurHandler implements StateChangeHandler, | |||
| FocusHandler, BlurHandler { | |||
|
|
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| private final AbstractComponentConnector connector; | |||
| private final Widget widget; | |||
| private HandlerRegistration focusRegistration = null; | |||
| private HandlerRegistration blurRegistration = null; | |||
|
|
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| public static void addHandlers(AbstractComponentConnector connector) { | |||
| addHandlers(connector, connector.getWidget()); | |||
| } | |||
|
|
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| public static void addHandlers(AbstractComponentConnector connector, | |||
| Widget widget) { | |||
| connector.addStateChangeHandler("registeredEventListeners", | |||
| new ConnectorFocusAndBlurHandler(connector, widget)); | |||
| } | |||
|
|
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| private ConnectorFocusAndBlurHandler(AbstractComponentConnector connector, | |||
| Widget widget) { | |||
| this.connector = connector; | |||
| this.widget = widget; | |||
| } | |||
|
|
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| @Override | |||
| public void onStateChanged(StateChangeEvent stateChangeEvent) { | |||
| focusRegistration = EventHelper.updateHandler(connector, this, | |||
| EventId.FOCUS, focusRegistration, FocusEvent.getType(), widget); | |||
| blurRegistration = EventHelper.updateHandler(connector, this, | |||
| EventId.BLUR, blurRegistration, BlurEvent.getType(), widget); | |||
| } | |||
|
|
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| @Override | |||
| public void onFocus(FocusEvent event) { | |||
| // updateHandler ensures that this is called only when | |||
| // there is a listener on the server side | |||
| getRpc().focus(); | |||
| } | |||
|
|
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| @Override | |||
| public void onBlur(BlurEvent event) { | |||
| // updateHandler ensures that this is called only when | |||
| // there is a listener on the server side | |||
| getRpc().blur(); | |||
| } | |||
|
|
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| private FocusAndBlurServerRpc getRpc() { | |||
| return connector.getRpcProxy(FocusAndBlurServerRpc.class); | |||
| } | |||
| } | |||
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