package org.drools.guvnor.client.table;
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.core.client.GWT;
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;
/**
* Based on GWT bikeshed example.
* @author Geoffrey De Smet
*/
public class SortableHeader<T, C extends Comparable> extends Header<String> {
private static final TableImageResources TABLE_IMAGE_RESOURCES = GWT.create(TableImageResources.class);
private static final String DOWN_ARROW = makeImage(TABLE_IMAGE_RESOURCES.downArrow());
private static final String SMALL_DOWN_ARROW = makeImage(TABLE_IMAGE_RESOURCES.smallDownArrow());
private static final String UP_ARROW = makeImage(TABLE_IMAGE_RESOURCES.upArrow());
private static final String SMALL_UP_ARROW = makeImage(TABLE_IMAGE_RESOURCES.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;
}
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>");
}
}