package com.cedarsoft.utils.tags.ui;
import com.cedarsoft.utils.tags.SingleTaggable;
import com.cedarsoft.utils.tags.Tag;
import com.cedarsoft.utils.tags.TagObservable;
import com.cedarsoft.utils.tags.TagProvider;
import com.cedarsoft.utils.tags.Taggable;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import javax.swing.ComboBoxModel;
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListDataListener;
import java.lang.Override;
/**
* ComboboxModel prsenting tags
*/
public class TagComboBoxModel extends TagListModel implements ComboBoxModel {
@NotNull
private final SingleTaggable taggable = new SingleTaggable( this );
public TagComboBoxModel( @NotNull TagObservable availableTags ) {
this( availableTags, true );
}
public TagComboBoxModel( @NotNull TagObservable availableTags, boolean nullable ) {
super( availableTags, nullable );
}
/**
* Returns a taggable representing the selection
*
* @return the selection
*/
@NotNull
public Taggable getSelectionTaggable() {
return taggable;
}
@Override
public void setSelectedItem( @Nullable Object anItem ) {
//noinspection ObjectEquality
if ( anItem == getSelectedItem() ) {
return;
}
@Nullable
final Tag newTag;
if ( anItem == null || anItem instanceof Tag ) {
newTag = ( Tag ) anItem;
} else if ( anItem instanceof String ) {
if ( ( ( CharSequence ) anItem ).length() == 0 ) {
newTag = null;
} else {
newTag = getTagProvider().getTag( ( String ) anItem );
}
} else {
throw new IllegalStateException( "???? " + anItem.getClass().getName() );
}
taggable.setSelectedTag( newTag );
if ( !listeners.isEmpty() ) {
ListDataEvent event = new ListDataEvent( this, ListDataEvent.CONTENTS_CHANGED, -1, -1 );
for ( ListDataListener listener : listeners ) {
listener.contentsChanged( event );
}
}
}
@NotNull
private TagProvider getTagProvider() {
if ( availableTags instanceof TagProvider ) {
return ( TagProvider ) availableTags;
} else {
throw new IllegalStateException( "Can't create tags - need a tag provider" );
}
}
@Override
@Nullable
public Tag getSelectedItem() {
return taggable.getSelectedTag();
}
}