| /* |
| * Copyright 2009 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.uibinder.elementparsers; |
| |
| import com.google.gwt.core.ext.UnableToCompleteException; |
| import com.google.gwt.core.ext.typeinfo.JClassType; |
| import com.google.gwt.core.ext.typeinfo.JEnumType; |
| import com.google.gwt.core.ext.typeinfo.NotFoundException; |
| import com.google.gwt.dom.client.Style.Unit; |
| import com.google.gwt.uibinder.rebind.FieldWriter; |
| import com.google.gwt.uibinder.rebind.UiBinderWriter; |
| import com.google.gwt.uibinder.rebind.XMLElement; |
| import com.google.gwt.user.client.ui.SplitLayoutPanel; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Parses {@link com.google.gwt.user.client.ui.DockLayoutPanel} widgets. |
| * |
| * TODO(jgw): The code that explicitly excludes SplitLayoutPanel in a fairly |
| * awkward way could be greatly simplified if we hoisted the "dock-ness" into an |
| * interface implemented by both DockLayoutPanel and SplitLayoutPanel, and moved |
| * most of this code into a parser for that specific interface. This parser |
| * would then be reduced to a simple special case for the ctor param. |
| */ |
| public class DockLayoutPanelParser implements ElementParser { |
| |
| private static class CenterChild { |
| final String widgetName; |
| final XMLElement child; |
| |
| public CenterChild(XMLElement child, String widgetName) { |
| this.widgetName = widgetName; |
| this.child = child; |
| } |
| } |
| |
| private static final Map<String, String> DOCK_NAMES = new HashMap<String, String>(); |
| |
| static { |
| DOCK_NAMES.put("north", "addNorth"); |
| DOCK_NAMES.put("south", "addSouth"); |
| DOCK_NAMES.put("east", "addEast"); |
| DOCK_NAMES.put("west", "addWest"); |
| DOCK_NAMES.put("lineStart", "addLineStart"); |
| DOCK_NAMES.put("lineEnd", "addLineEnd"); |
| DOCK_NAMES.put("center", "add"); |
| } |
| |
| public void parse(XMLElement elem, String fieldName, JClassType type, |
| UiBinderWriter writer) throws UnableToCompleteException { |
| // Generate instantiation (requires a 'unit' ctor param). |
| // (Don't generate a ctor for the SplitLayoutPanel, it has its own parser). |
| if (type != getSplitLayoutPanelType(writer)) { |
| JEnumType unitEnumType = writer.getOracle().findType( |
| Unit.class.getCanonicalName()).isEnum(); |
| String unit = elem.consumeAttributeWithDefault("unit", |
| String.format("%s.%s", unitEnumType.getQualifiedSourceName(), "PX"), |
| unitEnumType); |
| writer.setFieldInitializerAsConstructor(fieldName, unit); |
| } |
| |
| CenterChild center = null; |
| |
| // Parse children. |
| for (XMLElement child : elem.consumeChildElements()) { |
| // Make sure the element is one of the fixed set of valid directions. |
| if (!isValidChildElement(elem, child)) { |
| writer.die(elem, |
| "Child must be one of " |
| + "<%1$s:north>, <%1$s:south>, <%1$s:east>, <%1$s:west> or <%1$s:center>, " |
| + "but found %2$s", elem.getPrefix(), child); |
| } |
| |
| // Consume the single widget element. |
| XMLElement widget = child.consumeSingleChildElement(); |
| if (!writer.isWidgetElement(widget)) { |
| writer.die(elem, "%s must contain a widget, but found %s", child, |
| widget); |
| } |
| FieldWriter widgetField = writer.parseElementToField(widget); |
| |
| if (child.getLocalName().equals("center")) { |
| if (center != null) { |
| writer.die(elem, "Only one <%s:center> is allowed", elem.getPrefix()); |
| } |
| center = new CenterChild(child, widgetField.getNextReference()); |
| } else { |
| String size = child.consumeRequiredDoubleAttribute("size"); |
| writer.addStatement("%s.%s(%s, %s);", fieldName, addMethodName(child), |
| widgetField.getNextReference(), size); |
| } |
| } |
| |
| if (center != null) { |
| writer.addStatement("%s.%s(%s);", fieldName, addMethodName(center.child), |
| center.widgetName); |
| } |
| } |
| |
| private String addMethodName(XMLElement elem) { |
| return DOCK_NAMES.get(elem.getLocalName()); |
| } |
| |
| private JClassType getSplitLayoutPanelType(UiBinderWriter writer) { |
| try { |
| return writer.getOracle().getType(SplitLayoutPanel.class.getName()); |
| } catch (NotFoundException e) { |
| throw new RuntimeException("Unexpected exception", e); |
| } |
| } |
| |
| private boolean isValidChildElement(XMLElement parent, XMLElement child) { |
| if (!parent.getNamespaceUri().equals(child.getNamespaceUri())) { |
| return false; |
| } |
| if (!DOCK_NAMES.containsKey(child.getLocalName())) { |
| return false; |
| } |
| // Made it through the gauntlet. |
| return true; |
| } |
| } |