package org.drools.guvnor.client.widgets.tables;
import com.google.gwt.cell.client.Cell;
import com.google.gwt.cell.client.ClickableTextCell;
import com.google.gwt.cell.client.ValueUpdater;
import com.google.gwt.resources.client.ImageResource;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.user.cellview.client.Column;
import com.google.gwt.user.cellview.client.Header;
import com.google.gwt.user.client.ui.AbstractImagePrototype;
import org.drools.guvnor.client.resources.TableImageResources;
/**
* Based on GWT bikeshed example.
*/
public class SortableHeader<T, C extends Comparable> extends Header<String> {
private static final String DOWN_ARROW = makeImage(TableImageResources.INSTANCE.downArrow());
private static final String SMALL_DOWN_ARROW = makeImage( TableImageResources.INSTANCE.smallDownArrow() );
private static final String UP_ARROW = makeImage( TableImageResources.INSTANCE.upArrow() );
private static final String SMALL_UP_ARROW = makeImage( TableImageResources.INSTANCE.smallUpArrow() );
private static String makeImage(ImageResource resource) {
AbstractImagePrototype prototype = AbstractImagePrototype.create( resource );
return prototype.getHTML();
}
private final SortableHeaderGroup sortableHeaderGroup;
private String text;
private final Column<T, C> column;
private SortDirection sortDirection = SortDirection.NONE;
private int sortIndex = -1;
public SortableHeader(SortableHeaderGroup sortableHeaderGroup,
String text,
Column<T, C> column) {
super( new ClickableTextCell() );
this.sortableHeaderGroup = sortableHeaderGroup;
this.text = text;
this.column = column;
setUpdater( new ValueUpdater<String>() {
public void update(String s) {
SortableHeader.this.sortableHeaderGroup.headerClicked( SortableHeader.this );
}
} );
}
/**
* @return the header label
*/
public String getValue() {
return text;
}
/**
* Set the Column header
*
* @param text
*/
public void setValue(String text) {
this.text = text;
}
public Column<T, C> getColumn() {
return column;
}
public SortDirection getSortDirection() {
return sortDirection;
}
public void setSortDirection(SortDirection sortDirection) {
this.sortDirection = sortDirection;
}
public int getSortIndex() {
return sortIndex;
}
public void setSortIndex(int sortIndex) {
this.sortIndex = sortIndex;
}
@Override
public void render(Cell.Context context,
SafeHtmlBuilder sb) {
sb.appendHtmlConstant( "<div style='position: relative; cursor: pointer; padding: 0px;'>" );
sb.appendHtmlConstant( "<span style='padding-right: 10px'>" );
sb.appendEscaped( text );
sb.appendHtmlConstant( "</span>" );
// sb.appendHtmlConstant("<div style='position:absolute;right:0px;top:0px;'></div>");
switch ( sortDirection ) {
case NONE :
// nothing
break;
case ASCENDING :
sb.appendHtmlConstant( sortIndex == 0 ? UP_ARROW : SMALL_UP_ARROW );
break;
case DESCENDING :
sb.appendHtmlConstant( sortIndex == 0 ? DOWN_ARROW : SMALL_DOWN_ARROW );
break;
default :
throw new IllegalArgumentException( "Unknown sortDirection ("
+ sortDirection
+ ")." );
}
sb.appendHtmlConstant( "</div>" );
// sb.appendHtmlConstant("<div>");
// sb.appendHtmlConstant("</div></div>");
}
}