| /* |
| * Copyright 2008 Google 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.google.gwt.user.client.impl; |
| |
| import com.google.gwt.core.client.JavaScriptObject; |
| import com.google.gwt.event.logical.shared.HasValueChangeHandlers; |
| import com.google.gwt.event.logical.shared.ValueChangeEvent; |
| import com.google.gwt.event.logical.shared.ValueChangeHandler; |
| import com.google.gwt.event.shared.GwtEvent; |
| import com.google.gwt.event.shared.HandlerManager; |
| import com.google.gwt.event.shared.HandlerRegistration; |
| |
| /** |
| * Native implementation associated with |
| * {@link com.google.gwt.user.client.History}. User classes should not use this |
| * class directly. |
| * |
| * <p> |
| * This base version uses the HTML5 standard window.onhashchange event to |
| * determine when the URL hash identifier changes. |
| * </p> |
| */ |
| public class HistoryImpl implements HasValueChangeHandlers<String> { |
| |
| private static String token = ""; |
| |
| public static String getToken() { |
| return (token == null) ? "" : token; |
| } |
| |
| /** |
| * Sets whether the IE6 history implementation will update the URL hash when |
| * creating a new item. This should be used only for applications with large |
| * DOM structures that are suffering from performance problems when creating a |
| * new history item on IE6 and 7. |
| * |
| * @deprecated This is no longer necessary, as the underlying performance |
| * problem has been solved. It is now a no-op. |
| */ |
| @Deprecated |
| @SuppressWarnings("unused") |
| public static void setUpdateHashOnIE6(boolean updateHash) { |
| } |
| |
| protected static void setToken(String token) { |
| HistoryImpl.token = token; |
| } |
| |
| private JavaScriptObject oldHandler; |
| |
| private HandlerManager handlers = new HandlerManager(null); |
| |
| /** |
| * Adds a {@link ValueChangeEvent} handler to be informed of changes to the |
| * browser's history stack. |
| * |
| * @param handler the handler |
| */ |
| public HandlerRegistration addValueChangeHandler( |
| ValueChangeHandler<String> handler) { |
| return handlers.addHandler(ValueChangeEvent.getType(), handler); |
| } |
| |
| public native void dispose() /*-{ |
| $wnd.onhashchange = this.@com.google.gwt.user.client.impl.HistoryImpl::oldHandler; |
| }-*/; |
| |
| public native String encodeFragment(String fragment) /*-{ |
| // encodeURI() does *not* encode the '#' character. |
| return encodeURI(fragment).replace("#", "%23"); |
| }-*/; |
| |
| public void fireEvent(GwtEvent<?> event) { |
| handlers.fireEvent(event); |
| } |
| |
| /** |
| * Fires the {@link ValueChangeEvent} to all handlers with the given tokens. |
| */ |
| public void fireHistoryChangedImpl(String newToken) { |
| ValueChangeEvent.fire(this, newToken); |
| } |
| |
| public HandlerManager getHandlers() { |
| return handlers; |
| } |
| |
| public native boolean init() /*-{ |
| var token = ''; |
| |
| // Get the initial token from the url's hash component. |
| var hash = $wnd.location.hash; |
| if (hash.length > 0) { |
| token = this.@com.google.gwt.user.client.impl.HistoryImpl::decodeFragment(Ljava/lang/String;)(hash.substring(1)); |
| } |
| |
| @com.google.gwt.user.client.impl.HistoryImpl::setToken(Ljava/lang/String;)(token); |
| |
| var historyImpl = this; |
| |
| historyImpl.@com.google.gwt.user.client.impl.HistoryImpl::oldHandler = $wnd.onhashchange; |
| |
| $wnd.onhashchange = $entry(function() { |
| var token = '', hash = $wnd.location.hash; |
| if (hash.length > 0) { |
| token = historyImpl.@com.google.gwt.user.client.impl.HistoryImpl::decodeFragment(Ljava/lang/String;)(hash.substring(1)); |
| } |
| |
| historyImpl.@com.google.gwt.user.client.impl.HistoryImpl::newItemOnEvent(Ljava/lang/String;)(token); |
| var oldHandler = historyImpl.@com.google.gwt.user.client.impl.HistoryImpl::oldHandler; |
| if (oldHandler) { |
| oldHandler(); |
| } |
| }); |
| |
| return true; |
| }-*/; |
| |
| public final void newItem(String historyToken, boolean issueEvent) { |
| historyToken = (historyToken == null) ? "" : historyToken; |
| if (!historyToken.equals(getToken())) { |
| setToken(historyToken); |
| nativeUpdate(historyToken); |
| if (issueEvent) { |
| fireHistoryChangedImpl(historyToken); |
| } |
| } |
| } |
| |
| public final void newItemOnEvent(String historyToken) { |
| historyToken = (historyToken == null) ? "" : historyToken; |
| if (!historyToken.equals(getToken())) { |
| setToken(historyToken); |
| nativeUpdateOnEvent(historyToken); |
| fireHistoryChangedImpl(historyToken); |
| } |
| } |
| |
| protected native String decodeFragment(String encodedFragment) /*-{ |
| // decodeURI() does *not* decode the '#' character. |
| return decodeURI(encodedFragment.replace("%23", "#")); |
| }-*/; |
| |
| /** |
| * The standard updateHash implementation assigns to location.hash() with an |
| * encoded history token. |
| */ |
| protected native void nativeUpdate(String historyToken) /*-{ |
| $wnd.location.hash = this.@com.google.gwt.user.client.impl.HistoryImpl::encodeFragment(Ljava/lang/String;)(historyToken); |
| }-*/; |
| |
| @SuppressWarnings("unused") |
| protected void nativeUpdateOnEvent(String historyToken) { |
| // Do nothing, the hash is already updated. |
| } |
| } |