Java tutorial
package org.jboss.as.console.client.widgets.tables; /* * JBoss, Home of Professional Open Source * Copyright 2011 Red Hat Inc. and/or its affiliates and other contributors * as indicated by the @author tags. All rights reserved. * See the copyright.txt in the distribution for a * full listing of individual contributors. * * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU Lesser General Public License, v. 2.1. * This program is distributed in the hope that it will be useful, but WITHOUT A * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. * You should have received a copy of the GNU Lesser General Public License, * v.2.1 along with this distribution; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301, USA. */ 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.ValueChangeHandler; import com.google.gwt.safehtml.client.SafeHtmlTemplates; import com.google.gwt.safehtml.shared.SafeHtml; import com.google.gwt.user.cellview.client.CellTable; import com.google.gwt.user.client.Event; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.HTMLPanel; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.Image; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.PopupPanel; import com.google.gwt.user.client.ui.VerticalPanel; import com.google.gwt.user.client.ui.Widget; import com.google.gwt.view.client.SelectionChangeEvent; import com.google.gwt.view.client.SingleSelectionModel; import org.jboss.as.console.client.widgets.icons.ConsoleIcons; import org.jboss.ballroom.client.widgets.tables.DefaultPager; import java.util.ArrayList; import java.util.List; /** * @author Heiko Braun * @date 2/24/11 */ public class TablePicker<T> { // implements HasValueChangeHandlers<T> { private static final int ESCAPE = 27; public final static double GOLDEN_RATIO = 1.618; private ValueRenderer<T> renderer; private boolean isRightToLeft = false; interface Template extends SafeHtmlTemplates { @Template("<div class=\"{0}\">{1}</div>") SafeHtml item(String cssClass, String title); } private static final Template TEMPLATE = GWT.create(Template.class); private PopupPanel popup; private HorizontalPanel header; private HTML currentDisplayedValue; private List<ValueChangeHandler<T>> changeHandlers = new ArrayList<ValueChangeHandler<T>>(); int popupWidth = -1; private CellTable<T> cellTable; private String description = null; public interface ValueRenderer<T> { String render(T selection); }; public void setRightToLeft(boolean rightToLeft) { isRightToLeft = rightToLeft; } public TablePicker(final CellTable<T> table, final ValueRenderer<T> renderer) { this.cellTable = table; this.renderer = renderer; } public void setPopupWidth(int popupWidth) { this.popupWidth = popupWidth; } public void setDescription(String description) { this.description = description; } public Widget asWidget() { if (null == cellTable.getSelectionModel()) cellTable.setSelectionModel(new SingleSelectionModel<T>()); cellTable.getSelectionModel().addSelectionChangeHandler(new SelectionChangeEvent.Handler() { @Override public void onSelectionChange(SelectionChangeEvent selectionChangeEvent) { T selection = ((SingleSelectionModel<T>) cellTable.getSelectionModel()).getSelectedObject(); String displayValue = renderer.render(selection); currentDisplayedValue.setText(displayValue); } }); final String panelId = "popup_" + HTMLPanel.createUniqueId(); popup = new PopupPanel(true, true) { @Override protected void onPreviewNativeEvent(Event.NativePreviewEvent event) { if (Event.ONKEYUP == event.getTypeInt()) { if (event.getNativeEvent().getKeyCode() == ESCAPE) { // Dismiss when escape is pressed popup.hide(); } } } public void onBrowserEvent(Event event) { super.onBrowserEvent(event); } }; popup.getElement().setId(panelId); popup.setStyleName("default-popup"); /*popup.addCloseHandler(new CloseHandler<PopupPanel>() { public void onClose(CloseEvent<PopupPanel> event) { } });*/ VerticalPanel layout = new VerticalPanel(); layout.setStyleName("fill-layout-width"); layout.addStyleName("tablepicker-popup"); if (description != null) layout.add(new Label(description)); layout.add(cellTable); DefaultPager pager = new DefaultPager(); pager.setDisplay(cellTable); layout.add(pager); popup.setWidget(layout); currentDisplayedValue = new HTML(" "); currentDisplayedValue.setStyleName("table-picker-value"); header = new HorizontalPanel(); header.setStyleName("table-picker"); header.add(currentDisplayedValue); Image img = new Image(ConsoleIcons.INSTANCE.tablePicker()); header.add(img); currentDisplayedValue.getElement().getParentElement().setAttribute("width", "100%"); img.getParent().getElement().setAttribute("width", "18"); header.getElement().setAttribute("width", "100%"); header.getElement().setAttribute("cellspacing", "0"); header.getElement().setAttribute("cellpadding", "0"); header.getElement().setAttribute("border", "0"); ClickHandler clickHandler = new ClickHandler() { @Override public void onClick(ClickEvent clickEvent) { openPanel(); } }; currentDisplayedValue.addClickHandler(clickHandler); img.addClickHandler(clickHandler); return header; } private void openPanel() { int winWidth = popupWidth != -1 ? popupWidth : header.getOffsetWidth() * 2; int winHeight = (int) (winWidth / GOLDEN_RATIO); popup.setWidth(winWidth + "px"); popup.setHeight(winHeight + "px"); // right to left if (isRightToLeft) { int popupLeft = header.getAbsoluteLeft() - (winWidth - header.getOffsetWidth()); popup.setPopupPosition(popupLeft - 15, header.getAbsoluteTop() + 21); } else { int popupLeft = header.getAbsoluteLeft(); popup.setPopupPosition(popupLeft, header.getAbsoluteTop() + 21); } popup.show(); } /*@Override public HandlerRegistration addValueChangeHandler(final ValueChangeHandler<T> handler) { changeHandlers.add(handler); return new HandlerRegistration() { @Override public void removeHandler() { changeHandlers.remove(handler); } }; } @Override public void fireEvent(GwtEvent<?> gwtEvent) { for(ValueChangeHandler<T> handler : changeHandlers) handler.onValueChange((ValueChangeEvent<T>)gwtEvent); } */ public void clearSelection() { currentDisplayedValue.setText(""); } }