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com.google.gwt.uibinder.elementparsers.LayoutPanelParser Maven / Gradle / Ivy
/*
* 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.uibinder.rebind.UiBinderWriter;
import com.google.gwt.uibinder.rebind.XMLElement;
/**
* Parses {@link com.google.gwt.user.client.ui.LayoutPanel LayoutPanel} widgets.
*/
public class LayoutPanelParser implements ElementParser {
private static final String ERR_PAIRING = "'%s' must be paired with '%s' or '%s'.";
private static final String ERR_TOO_MANY = "There are too many %s constraints.";
private static final String ERR_NEGATIVE_WIDTH = "Attribute 'width' can not be negative.";
private static final String ERR_NEGATIVE_HEIGHT = "Attribute 'height' can not be negative.";
private static final String LAYER = "layer";
public void parse(XMLElement elem, String fieldName, JClassType type,
UiBinderWriter writer) throws UnableToCompleteException {
// Parse children.
for (XMLElement layerElem : elem.consumeChildElements()) {
// Get the layer element.
if (!isElementType(elem, layerElem, LAYER)) {
writer.die(layerElem, "Only <%s:%s> children are allowed.",
elem.getPrefix(), LAYER);
}
// Get the child widget element.
String childFieldName = writer.parseElementToField(layerElem.consumeSingleChildElement());
writer.addStatement("%1$s.add(%2$s);", fieldName, childFieldName);
// Parse the horizontal layout constraints.
String left = layerElem.consumeLengthAttribute("left");
String right = layerElem.consumeLengthAttribute("right");
String width = layerElem.consumeLengthAttribute("width");
if (isNegative(width)) {
writer.die(layerElem, ERR_NEGATIVE_WIDTH);
}
if (left != null) {
if (right != null) {
if (width != null) {
writer.die(layerElem, ERR_TOO_MANY, "horizontal");
}
generateConstraint(fieldName, childFieldName, "LeftRight", left,
right, writer);
} else if (width != null) {
generateConstraint(fieldName, childFieldName, "LeftWidth", left,
width, writer);
} else {
writer.die(layerElem, ERR_PAIRING, "left", "right", "width");
}
} else if (right != null) {
if (width != null) {
generateConstraint(fieldName, childFieldName, "RightWidth", right,
width, writer);
} else {
writer.die(layerElem, ERR_PAIRING, "right", "left", "width");
}
}
// Parse the vertical layout constraints.
String top = layerElem.consumeLengthAttribute("top");
String bottom = layerElem.consumeLengthAttribute("bottom");
String height = layerElem.consumeLengthAttribute("height");
if (isNegative(height)) {
writer.die(layerElem, ERR_NEGATIVE_HEIGHT);
}
if (top != null) {
if (bottom != null) {
if (height != null) {
writer.die(layerElem, ERR_TOO_MANY, "vertical");
}
generateConstraint(fieldName, childFieldName, "TopBottom", top,
bottom, writer);
} else if (height != null) {
generateConstraint(fieldName, childFieldName, "TopHeight", top,
height, writer);
} else {
writer.die(layerElem, ERR_PAIRING, "top", "bottom", "height");
}
} else if (bottom != null) {
if (height != null) {
generateConstraint(fieldName, childFieldName, "BottomHeight", bottom,
height, writer);
} else {
writer.die(layerElem, ERR_PAIRING, "bottom", "top", "height");
}
}
}
}
private void generateConstraint(String panelName, String widgetName,
String constraintName, String first, String second, UiBinderWriter writer) {
writer.addStatement("%s.setWidget%s(%s, %s, %s);", panelName,
constraintName, widgetName, first, second);
}
private boolean isElementType(XMLElement parent, XMLElement child, String type) {
return parent.getNamespaceUri().equals(child.getNamespaceUri())
&& type.equals(child.getLocalName());
}
/**
* @return true
if in given value, unit
expression
* value
part is obviously negative.
*/
private boolean isNegative(String expression) {
if (expression != null && expression.length() >= 2
&& expression.charAt(0) == '-') {
char secondChar = expression.charAt(1);
return Character.isDigit(secondChar);
}
return false;
}
}