litesoft
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// This Source Code is in the Public Domain per: http://unlicense.org package org.litesoft.GWT.client.widgets.nonpublic; import java.util.*; import org.litesoft.GWT.client.widgets.*; import com.google.gwt.user.client.*; import com.google.gwt.user.client.ui.*; public abstract class AbstractSizeableSimplePanel extends AbstractSizeablePanel implements SizeableSingleWidgetContainer { private Widget mWidget; @Override public boolean anyChildren() { return (mWidget != null); } // vvvvvvvvvvv HasWidgets /** * Removes all child widgets. */ @Override public void clear() { if ( anyChildren() ) { remove( mWidget ); } } /** * Gets an iterator for the contained widgets. This iterator is required to * implement {@link Iterator#remove()}. */ @Override public Iterator<Widget> iterator() { // Return a simple iterator that enumerates the 0 or 1 elements in this // panel. return new SingleWidgetIterator( mWidget ) { @Override public void remove() { clear(); } }; } /** * Adds a widget to this panel. * * @param pWidget the child widget to be added */ @Override public void add( Widget pWidget ) { // Can't add() more than one widget to a SimplePanel. if ( getWidget() != null ) { throw new IllegalStateException( "SimplePanel can only contain one child widget" ); } setWidget( pWidget ); } /** * Removes a child widget. * * @param pWidget the widget to be removed * * @return <code>true</code> if the widget was present */ @Override public boolean remove( Widget pWidget ) { if ( mWidget == pWidget ) { disown( pWidget ); return true; } return false; } // ^^^^^^^^^^^ HasWidgets // vvvvvvvvvvv SingleWidgetContainer /** * Gets the panel's child widget. * * @return the child widget, or <code>null</code> if none is present */ @Override public Widget getWidget() { return mWidget; } /** * Sets this panel's widget. Any existing child widget will be removed. */ @Override public void setWidget( Widget pWidget ) { // If there is already a widget attached, remove it. if ( mWidget != null ) { disown( mWidget ); } if ( pWidget != null ) { // Adopt the child. adopt( pWidget ); } } // ^^^^^^^^^^^ SingleWidgetContainer @Override protected final Element adopt( Widget w, Element container ) { throw new IllegalStateException( "Inappropriate use of raw adopt( Widget w, Element container )" ); } /** * Do everything to add pWidget * * @param pWidget !null */ protected void adopt( Widget pWidget ) { if ( aboutToAdopt( pWidget ) ) { LLadopt( pWidget ); justAdopted( pWidget ); } } /** * Do everything to remove pWidget * * @param pWidget !null */ @Override protected Element disown( Widget pWidget ) { if ( aboutToDisown( pWidget ) ) { LLdisown( pWidget ); justDisowned( pWidget ); } return null; // Don't care } protected void LLdisown( Widget pWidget ) { super.disown( pWidget ); // remove Widget from td mWidget = null; } protected void LLadopt( Widget pWidget ) { pWidget.removeFromParent(); super.adopt( pWidget, getContainerElement() ); // put Widget in TD mWidget = pWidget; } /** * Override point for special behavior of addition, before adding. * Could throw an exception! * * @return true if OK to add */ @SuppressWarnings({"UnusedDeclaration"}) protected boolean aboutToAdopt( Widget pWidget ) { return true; } /** * Override point for special behavior of addition. * Should not throw an exception! */ @SuppressWarnings({"UnusedDeclaration"}) protected void justAdopted( Widget pWidget ) { } /** * Override point for special behavior of removal, before removing. * Could throw an exception! * * @return true if OK to add */ @SuppressWarnings({"UnusedDeclaration"}) protected boolean aboutToDisown( Widget pWidget ) { return true; } /** * Override point for special behavior of removal. * Should not throw an exception! */ @SuppressWarnings({"UnusedDeclaration"}) protected void justDisowned( Widget pWidget ) { } @Override public void setWidth( String width ) { super.setWidth( width ); // for stacktrace Debugging } @Override public void setHeight( String height ) { super.setHeight( height ); // for stacktrace Debugging } @Override protected void distributeToChildrenChangedWidth() { getHelper().applyChangedDimensionToChild( getWidget(), getWidthHelper() ); } @Override protected void distributeToChildrenChangedHeight() { getHelper().applyChangedDimensionToChild( getWidget(), getHeightHelper() ); } } |