/*
* Copyright 2010 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.guvnor.client.table;
import java.util.ArrayList;
import java.util.List;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.CloseEvent;
import com.google.gwt.event.logical.shared.CloseHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.cellview.client.CellTable;
import com.google.gwt.user.cellview.client.Column;
import com.google.gwt.user.cellview.client.Header;
import com.google.gwt.user.client.ui.CheckBox;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.ToggleButton;
import com.google.gwt.user.client.ui.VerticalPanel;
/**
* @author Geoffrey De Smet
*/
public class ColumnPicker<T> {
private static final TableImageResources TABLE_IMAGE_RESOURCES = GWT.create(TableImageResources.class);
private static final Image COLUMN_PICKER_IMAGE = new Image(TABLE_IMAGE_RESOURCES.columnPicker());
private final CellTable<T> cellTable;
private List<ColumnMeta<T>> columnMetaList = new ArrayList<ColumnMeta<T>>();
public ColumnPicker(CellTable<T> cellTable) {
this.cellTable = cellTable;
}
public void addColumn(Column<T, ?> column, Header<String> header, boolean visible) {
addColumn(new ColumnMeta<T>(column, header, visible));
}
private void addColumn(ColumnMeta<T> columnMeta) {
columnMetaList.add(columnMeta);
if (columnMeta.isVisible()) {
cellTable.addColumn(columnMeta.getColumn(), columnMeta.getHeader());
}
}
public ToggleButton createToggleButton() {
final ToggleButton button = new ToggleButton(COLUMN_PICKER_IMAGE);
final PopupPanel popup = new PopupPanel(true);
popup.addCloseHandler(new CloseHandler<PopupPanel>() {
public void onClose(CloseEvent<PopupPanel> popupPanelCloseEvent) {
button.setDown(false);
}
});
VerticalPanel popupContent = new VerticalPanel();
for (final ColumnMeta<T> columnMeta : columnMetaList) {
final CheckBox checkBox = new CheckBox(columnMeta.getHeader().getValue());
checkBox.setValue(columnMeta.isVisible());
checkBox.addValueChangeHandler(new ValueChangeHandler<Boolean>() {
public void onValueChange(ValueChangeEvent<Boolean> booleanValueChangeEvent) {
boolean visible = booleanValueChangeEvent.getValue();
if (visible) {
// WORKAROUND because CellTable does not support insertColumn at this time
for (ColumnMeta<T> resettingColumnMeta : columnMetaList) {
if (resettingColumnMeta.isVisible()) {
cellTable.removeColumn(resettingColumnMeta.getColumn());
}
}
columnMeta.setVisible(visible);
for (ColumnMeta<T> resettingColumnMeta : columnMetaList) {
if (resettingColumnMeta.isVisible()) {
cellTable.addColumn(resettingColumnMeta.getColumn(), resettingColumnMeta.getHeader());
}
}
} else {
columnMeta.setVisible(visible);
cellTable.removeColumn(columnMeta.getColumn());
}
}
});
popupContent.add(checkBox);
}
popup.add(popupContent);
button.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
if (button.isDown()) {
popup.setPopupPosition(button.getAbsoluteLeft(), button.getAbsoluteTop() + button.getOffsetHeight());
popup.show();
}
// Note: no need to hide the popup when clicked when down,
// because clicking anywhere outside the popup will hide the popup
}
});
return button;
}
private static class ColumnMeta<T> {
private Column<T, ?> column;
private Header<String> header;
private boolean visible;
private ColumnMeta(Column<T, ?> column, Header<String> header, boolean visible) {
this.column = column;
this.header = header;
this.visible = visible;
}
public Column<T, ?> getColumn() {
return column;
}
public void setColumn(Column<T, ?> column) {
this.column = column;
}
public Header<String> getHeader() {
return header;
}
public void setHeader(Header<String> header) {
this.header = header;
}
public boolean isVisible() {
return visible;
}
public void setVisible(boolean visible) {
this.visible = visible;
}
}
}