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/** | |
* Copyright 2014 Richard Wallis. | |
* All rights reserved. | |
*/ | |
package com.wallissoftware.wave.client.widgets; | |
import com.google.gwt.user.client.ui.HTMLPanel; | |
import com.google.gwt.user.client.ui.IsWidget; | |
import com.google.gwt.user.client.ui.SimplePanel; | |
import com.google.gwt.user.client.ui.Widget; | |
/** | |
* Panel that wraps a GWT simple panel to be replaced by the widgetToAttach. This will make sure that the DIV element | |
* is being replaced rather than having the widget inserted in it. | |
* <p/> | |
* The result of this will be to have a better, cleaner, dom. | |
*/ | |
public class ReplacePanel extends SimplePanel { | |
static class WrongParentTypeException extends RuntimeException { | |
public WrongParentTypeException(final String message) { | |
super(message); | |
} | |
} | |
private IsWidget widget; | |
@Override | |
public Widget asWidget() { | |
return widget != null ? widget.asWidget() : super.asWidget(); | |
} | |
@Override | |
public Widget getWidget() { | |
return widget != null ? widget.asWidget() : super.getWidget(); | |
} | |
@Override | |
public void setWidget(final IsWidget widget) { | |
setWidget(widget.asWidget()); | |
} | |
@Override | |
public void setWidget(final Widget widgetToAttach) { | |
final Widget parentAsWidget = asWidget().getParent(); | |
if (!(parentAsWidget instanceof HTMLPanel)) { | |
throw new WrongParentTypeException("The parent of ReplacePanel must be of type HTMLPanel"); | |
} | |
final HTMLPanel parent = (HTMLPanel) parentAsWidget; | |
parent.addAndReplaceElement(widgetToAttach, asWidget().getElement()); | |
widget = widgetToAttach; | |
} | |
} |
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