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/* Copyright 2011, The gwtquery team.
*
* 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.query.client.impl;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.InputElement;
import com.google.gwt.query.client.GQuery;
import com.google.gwt.query.client.js.JsRegexp;
import com.google.gwt.query.client.js.JsUtils;
/**
* Helper class for setting and getting attribute on an element.
*/
public class AttributeImpl {
/**
* Interface used for attribute setter implementations.
*/
public interface AttributeSetter {
public boolean isRemoval(Object value);
public void setAttribute(Element e, String name, Object value);
}
/**
* Default setter using e.setAttribute() method.
*/
protected static class DefaultSetter implements AttributeSetter {
private static AttributeSetter INSTANCE;
public static AttributeSetter getInstance() {
if (INSTANCE == null) {
INSTANCE = new DefaultSetter();
}
return INSTANCE;
}
public boolean isRemoval(Object value) {
return value == null;
}
public void setAttribute(Element e, String key, Object value) {
e.setAttribute(key, String.valueOf(value));
}
}
/**
* value must be set on element directly
*/
protected static class ValueAttrSetter extends DefaultSetter {
private static AttributeSetter INSTANCE;
public static AttributeSetter getInstance() {
if (INSTANCE == null) {
INSTANCE = new ValueAttrSetter();
}
return INSTANCE;
}
public void setAttribute(Element e, String key, Object value) {
e.setPropertyObject("value", String.valueOf(value));
super.setAttribute(e, key, value);
}
}
/**
* Boolean attribute :
* - Ensure to set a boolean value to the element's property with the same
* name if this last exists
* - Ensure to set an attribute having the value equals to the name (i.e
* checked="checked")
*/
private static class BooleanAttrSetter extends DefaultSetter {
private static AttributeSetter INSTANCE;
public static AttributeSetter getInstance() {
if (INSTANCE == null) {
INSTANCE = new BooleanAttrSetter();
}
return INSTANCE;
}
public boolean isRemoval(Object value) {
return super.isRemoval(value) || Boolean.FALSE.equals(value);
}
public void setAttribute(Element e, String key, Object value) {
if (JsUtils.hasProperty(e, key)) {
e.setPropertyBoolean(key, true);
}
super.setAttribute(e, key, key.toLowerCase());
}
}
/**
* Id attribute.
*/
private static class IdAttrSetter extends DefaultSetter {
private static AttributeSetter INSTANCE;
public static AttributeSetter getInstance() {
if (INSTANCE == null) {
INSTANCE = new IdAttrSetter();
}
return INSTANCE;
}
public void setAttribute(Element e, String key, Object value) {
e.setId(value == null ? null : value.toString());
super.setAttribute(e, key, value);
}
}
/**
* For button and inputs, the type cannot be changed once the element is
* attached to the dom !
*/
private static class TypeAttrSetter extends DefaultSetter {
private static AttributeSetter INSTANCE;
private static JsRegexp NOT_AUTHORIZED_NODE = new JsRegexp(
"^(?:button|input)$", "i");
public static AttributeSetter getInstance() {
if (INSTANCE == null) {
INSTANCE = new TypeAttrSetter();
}
return INSTANCE;
}
protected TypeAttrSetter() {
}
public void setAttribute(Element e, String name, Object value) {
String tag = e.getNodeName();
if (NOT_AUTHORIZED_NODE.test(tag)
&& GQuery.$(e).parents("body").length() > 0) {
//TODO maybe it's better to simply do nothing...
throw new RuntimeException(
"You cannot change type of button or input element if the element is already attached to the dom");
}
if ("input".equals(tag.toLowerCase()) && "radio".equals(value)) {
//some browser (IE6-9) resets value property of the input when you change the type to radio button
InputElement ie = InputElement.as(e);
String keepValue = ie.getValue();
super.setAttribute(ie, "type", value);
ie.setValue(keepValue);
} else {
super.setAttribute(e, name, value);
}
}
}
private static final JsRegexp BOOLEAN_ATTR_REGEX = new JsRegexp(
"^(?:autofocus|autoplay|async|checked|controls|defer|disabled|hidden|loop|multiple|open|readonly|required|scoped|selected)$",
"i");
public void removeAttribute(GQuery gQuery, String key) {
for (Element e : gQuery.elements()) {
if (e.getNodeType() != 1) {
continue;
}
if (JsUtils.hasProperty(e, key)) {
if (BOOLEAN_ATTR_REGEX.test(key)) {
e.setPropertyBoolean(key, false);
} else {
e.setPropertyObject(key, null);
}
}
e.removeAttribute(key);
}
}
public void setAttribute(GQuery gQuery, String key, Object value) {
AttributeSetter setter = getAttributeSetter(key);
if (setter.isRemoval(value)) {
gQuery.removeAttr(key);
return;
}
value = fixValue(key, value);
for (Element e : gQuery.elements()) {
int nodeType = e.getNodeType();
//don't set attribute on text, comment and attributes nodes
if (nodeType == 3 || nodeType == 8 || nodeType == 2) {
continue;
}
setter.setAttribute(e, key, value);
}
}
protected Object fixValue(String key, Object value) {
return value;
}
protected AttributeSetter getAttributeSetter(String key) {
if ("type".equalsIgnoreCase(key)) {
return TypeAttrSetter.getInstance();
} else if ("id".equals(key)) {
return IdAttrSetter.getInstance();
} else if ("value".equals(key)) {
return ValueAttrSetter.getInstance();
} else if (BOOLEAN_ATTR_REGEX.test(key)) {
return BooleanAttrSetter.getInstance();
}
return DefaultSetter.getInstance();
}
}
