/*
* 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.plugins.widgets;
import static com.google.gwt.query.client.GQuery.$;
import java.util.Iterator;
import com.google.gwt.dom.client.BodyElement;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.query.client.GQuery;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.ComplexPanel;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.HasOneWidget;
import com.google.gwt.user.client.ui.HasWidgets;
import com.google.gwt.user.client.ui.Panel;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwt.user.client.ui.WidgetCollection;
public class WidgetsUtils {
static final String[] appendingTags = {
"td", "th", "li"};
/**
* Append a widget to a dom element, and hide it.
* Element classes will be copied to the new widget.
*/
public static void hideAndAfter(Element e, Widget widget) {
assert e != null && widget != null;
if ($(e).widget() != null && $(e).widget().isAttached()) {
replaceWidget($(e).widget(), widget, false);
} else {
detachWidget(widget);
hideAndAfter(e, widget.getElement());
attachWidget(widget, getFirstParentWidget(widget));
}
}
/**
* Test if the tag name of the element is one of tag names given in parameter
*
* @param tagNames
* @return
*/
public static boolean matchesTags(Element e, String... tagNames) {
assert e != null : "Element cannot be null";
StringBuilder regExp = new StringBuilder("^(");
int tagNameLenght = tagNames != null ? tagNames.length : 0;
for (int i = 0; i < tagNameLenght; i++) {
regExp.append(tagNames[i].toUpperCase());
if (i < tagNameLenght - 1) {
regExp.append("|");
}
}
regExp.append(")$");
return e.getTagName().toUpperCase().matches(regExp.toString());
}
/**
* Replace a dom element by a widget.
* Old element classes will be copied to the new widget.
*/
public static void replaceOrAppend(Element e, Widget widget) {
assert e != null && widget != null;
if ($(e).widget() != null && $(e).widget().isAttached()) {
replaceWidget($(e).widget(), widget, true);
} else {
detachWidget(widget);
replaceOrAppend(e, widget.getElement());
attachWidget(widget, getFirstParentWidget(widget));
}
}
private static Widget getFirstParentWidget(Widget w) {
Element e = w.getElement().getParentElement();
BodyElement body = Document.get().getBody();
while ((e != null) && (body != e)) {
if (Event.getEventListener(e) != null) {
Widget p = $(e).widget();
if (p != null){
return p;
}
}
e = e.getParentElement();
}
return null;
}
private static void hideAndAfter(Element oldElement, Element newElement) {
assert oldElement != null && newElement != null;
GQuery.$(oldElement).hide().after(newElement);
String c = oldElement.getClassName();
if (!c.isEmpty()) {
newElement.addClassName(c);
}
}
/**
* If the <code>oldElement</code> is a td, th, li tags, the new element will replaced its content.
* In other cases, the <code>oldElement</code> will be replaced by the <code>newElement</code>
* and the old element classes will be copied to the new element.
*/
private static void replaceOrAppend(Element oldElement, Element newElement) {
assert oldElement != null && newElement != null;
if(matchesTags(oldElement, appendingTags)){
GQuery.$(oldElement).html("").append(newElement);
}else{
GQuery.$(oldElement).replaceWith(newElement);
//copy class
String c = oldElement.getClassName();
if (!c.isEmpty()) {
newElement.addClassName(c);
}
//copy id
newElement.setId(oldElement.getId());
//ensure no duplicate id
oldElement.setId("");
}
}
private static void replaceWidget(Widget oldWidget, Widget newWidget, boolean remove) {
Widget parent = oldWidget.getParent();
boolean removed = false;
// TODO: handle tables
if (parent instanceof HTMLPanel) {
((HTMLPanel) parent).addAndReplaceElement(newWidget,
(com.google.gwt.dom.client.Element)oldWidget.getElement());
if (!remove) {
$(newWidget).before($(oldWidget));
}
removed = true;
} else if (parent instanceof ComplexPanel) {
((ComplexPanel) parent).add(newWidget);
} else if (parent instanceof SimplePanel) {
((SimplePanel) parent).setWidget(newWidget);
} else if (parent instanceof Panel) {
((Panel) parent).add(newWidget);
} else {
assert false : "Can not replace an attached widget whose parent is a " + parent.getClass().getName();
}
if (remove && !removed && oldWidget.isAttached()) {
oldWidget.removeFromParent();
} else {
oldWidget.setVisible(false);
}
}
/**
* Attach a widget to the GWT widget list. Normally used when GQuery
* creates widgets wrapping existing dom elements.
* It does nothing if the widget is already attached to another widget.
*
* @param widget to attach
* @param firstParentWidget the parent widget,
* If it is null and it is not inside any other widget, we just add
* the widget to the gwt detach list
*/
public static void attachWidget(Widget widget, Widget firstParentWidget) {
if (widget != null && widget.getParent() == null) {
if (firstParentWidget == null) {
firstParentWidget = getFirstParentWidget(widget);
if (firstParentWidget == null) {
RootPanel.detachOnWindowClose(widget);
widgetOnAttach(widget);
} else {
attachWidget(widget, firstParentWidget);
}
} else if (firstParentWidget instanceof HTMLPanel) {
HTMLPanel h = (HTMLPanel) firstParentWidget;
Element p = widget.getElement().getParentElement();
if (p != null) {
h.add(widget, p);
} else {
h.add(widget);
}
} else if (firstParentWidget instanceof HasOneWidget) {
((HasOneWidget)firstParentWidget).setWidget(widget);
} else if (firstParentWidget instanceof HasWidgets) {
try {
((HasWidgets)firstParentWidget).add(widget);
} catch (UnsupportedOperationException e) {
// Some widgets like 'table' has no implementation of 'add(widget)'
widgetSetParent(widget, firstParentWidget);
}
} else {
widgetSetParent(widget, firstParentWidget);
}
}
}
/**
* Remove a widget from the detach list
*/
public static void detachWidget(final Widget widget) {
if (widget != null) {
widget.removeFromParent();
}
}
/**
* This method detach a widget of its parent without doing a physical
* detach (DOM manipulation)
*
* @param w
*/
public static void doLogicalDetachFromHtmlPanel(Widget w) {
Widget parent = w.getParent();
if (parent instanceof HTMLPanel) {
complexPanelGetChildren((HTMLPanel) parent).remove(w);
widgetSetParent(w, null);
} else{
throw new IllegalStateException(
"You can only use this method to detach a child from an HTMLPanel");
}
}
/**
* Return children of the first widget's panel
*/
public static Iterator<Widget> getChildren(Widget w){
if(w instanceof Panel){
return ((Panel)w).iterator();
}
if(w instanceof Composite){
return getChildren(compositeGetWidget((Composite)w));
}
return null;
}
/**
* Return the first widget parent of the element, or null if it is not
* attached to any widget yet.
*/
private static Widget getFirstParentWidgetElement(Element element) {
return $(element).parents().widget();
}
private static native void widgetOnAttach(Widget w) /*-{
w.@com.google.gwt.user.client.ui.Widget::onAttach()();
}-*/;
private static native void widgetSetParent(Widget w, Widget p) /*-{
w.@com.google.gwt.user.client.ui.Widget::setParent(Lcom/google/gwt/user/client/ui/Widget;)(p);
}-*/;
private static native Widget compositeGetWidget(Composite w) /*-{
return w.@com.google.gwt.user.client.ui.Composite::getWidget()();
}-*/;
private static native WidgetCollection complexPanelGetChildren(ComplexPanel w) /*-{
return w.@com.google.gwt.user.client.ui.ComplexPanel::getChildren()();
}-*/;
}