Java tutorial
/* * Copyright 2000-2018 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.csslayout; import com.google.gwt.dom.client.Style; import com.google.gwt.user.client.ui.Widget; import com.vaadin.client.BrowserInfo; import com.vaadin.client.ComponentConnector; import com.vaadin.client.ConnectorHierarchyChangeEvent; import com.vaadin.client.FastStringMap; import com.vaadin.client.Profiler; import com.vaadin.client.Util; import com.vaadin.client.VCaption; import com.vaadin.client.communication.StateChangeEvent; import com.vaadin.client.ui.AbstractLayoutConnector; import com.vaadin.client.ui.LayoutClickEventHandler; import com.vaadin.client.ui.VCssLayout; import com.vaadin.shared.ui.Connect; import com.vaadin.shared.ui.LayoutClickRpc; import com.vaadin.shared.ui.csslayout.CssLayoutServerRpc; import com.vaadin.shared.ui.csslayout.CssLayoutState; import com.vaadin.shared.util.SharedUtil; import com.vaadin.ui.CssLayout; /** * Connects the server side widget {@link CssLayout} with the client side * counterpart {@link VCssLayout}. */ @Connect(CssLayout.class) public class CssLayoutConnector extends AbstractLayoutConnector { private LayoutClickEventHandler clickEventHandler = new LayoutClickEventHandler(this) { @Override protected ComponentConnector getChildComponent(com.google.gwt.user.client.Element element) { return Util.getConnectorForElement(getConnection(), getWidget(), element); } @Override protected LayoutClickRpc getLayoutClickRPC() { return getRpcProxy(CssLayoutServerRpc.class); } }; private final FastStringMap<VCaption> childIdToCaption = FastStringMap.create(); /* * (non-Javadoc) * * @see com.vaadin.client.ui.AbstractLayoutConnector#getState() */ @Override public CssLayoutState getState() { return (CssLayoutState) super.getState(); } /* * (non-Javadoc) * * @see * com.vaadin.client.ui.AbstractComponentConnector#onStateChanged(com.vaadin * .client.communication.StateChangeEvent) */ @Override public void onStateChanged(StateChangeEvent stateChangeEvent) { super.onStateChanged(stateChangeEvent); clickEventHandler.handleEventHandlerRegistration(); for (ComponentConnector child : getChildComponents()) { if (!getState().childCss.containsKey(child)) { continue; } String css = getState().childCss.get(child); Style style = child.getWidget().getElement().getStyle(); // should we remove styles also? How can we know what we have added // as it is added directly to the child component? String[] cssRules = css.split(";"); for (String cssRule : cssRules) { String[] parts = cssRule.split(":", 2); if (parts.length == 2) { style.setProperty(makeCamelCase(parts[0].trim()), parts[1].trim()); } } } } /* * (non-Javadoc) * * @see com.vaadin.client.ui.AbstractComponentContainerConnector# * onConnectorHierarchyChange * (com.vaadin.client.ConnectorHierarchyChangeEvent) */ @Override public void onConnectorHierarchyChange(ConnectorHierarchyChangeEvent event) { Profiler.enter("CssLayoutConnector.onConnectorHierarchyChange"); // Detach old child widgets and possibly their caption Profiler.enter("CssLayoutConnector.onConnectorHierarchyChange remove old children"); for (ComponentConnector child : event.getOldChildren()) { if (child.getParent() == this) { // Skip current children continue; } getWidget().remove(child.getWidget()); VCaption vCaption = childIdToCaption.get(child.getConnectorId()); if (vCaption != null) { childIdToCaption.remove(child.getConnectorId()); getWidget().remove(vCaption); } } Profiler.leave("CssLayoutConnector.onConnectorHierarchyChange remove old children"); Profiler.enter("CssLayoutConnector.onConnectorHierarchyChange add children"); int index = 0; for (ComponentConnector child : getChildComponents()) { VCaption childCaption = childIdToCaption.get(child.getConnectorId()); if (childCaption != null) { getWidget().addOrMove(childCaption, index++); } getWidget().addOrMove(child.getWidget(), index++); } Profiler.leave("CssLayoutConnector.onConnectorHierarchyChange add children"); Profiler.leave("CssLayoutConnector.onConnectorHierarchyChange"); } /** * Converts a css property string to CamelCase * * @param cssProperty * The property string * @return A string converted to camelcase */ private static final String makeCamelCase(String cssProperty) { cssProperty = SharedUtil.dashSeparatedToCamelCase(cssProperty); if ("float".equals(cssProperty)) { if (BrowserInfo.get().isIE()) { return "styleFloat"; } else { return "cssFloat"; } } return cssProperty; } /* * (non-Javadoc) * * @see com.vaadin.client.ui.AbstractComponentConnector#getWidget() */ @Override public VCssLayout getWidget() { return (VCssLayout) super.getWidget(); } /* * (non-Javadoc) * * @see com.vaadin.client.HasComponentsConnector#updateCaption(com.vaadin * .client.ComponentConnector) */ @Override public void updateCaption(ComponentConnector child) { Widget childWidget = child.getWidget(); int widgetPosition = getWidget().getWidgetIndex(childWidget); String childId = child.getConnectorId(); VCaption caption = childIdToCaption.get(childId); if (VCaption.isNeeded(child)) { if (caption == null) { caption = new VCaption(child, getConnection()); childIdToCaption.put(childId, caption); } if (!caption.isAttached()) { // Insert caption at widget index == before widget getWidget().insert(caption, widgetPosition); } caption.updateCaption(); } else if (caption != null) { childIdToCaption.remove(childId); getWidget().remove(caption); } } }