Java tutorial
/* * Copyright 2000-2014 Vaadin Ltd. * * 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 com.fnc.valo; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import com.vaadin.event.Transferable; import com.vaadin.event.dd.DragAndDropEvent; import com.vaadin.event.dd.DropHandler; import com.vaadin.event.dd.DropTarget; import com.vaadin.event.dd.TargetDetails; import com.vaadin.event.dd.acceptcriteria.AcceptCriterion; import com.vaadin.event.dd.acceptcriteria.Not; import com.vaadin.event.dd.acceptcriteria.SourceIsTarget; import com.vaadin.navigator.View; import com.vaadin.navigator.ViewChangeListener.ViewChangeEvent; import com.vaadin.server.ThemeResource; import com.vaadin.shared.ui.dd.HorizontalDropLocation; import com.vaadin.ui.AbstractOrderedLayout; import com.vaadin.ui.Alignment; import com.vaadin.ui.Button; import com.vaadin.ui.Button.ClickEvent; import com.vaadin.ui.Component; import com.vaadin.ui.CssLayout; import com.vaadin.ui.CustomComponent; import com.vaadin.ui.DragAndDropWrapper; import com.vaadin.ui.Embedded; import com.vaadin.ui.HorizontalLayout; import com.vaadin.ui.Label; import com.vaadin.ui.MenuBar; import com.vaadin.ui.MenuBar.MenuItem; import com.vaadin.ui.Notification; import com.vaadin.ui.VerticalLayout; /** * * @since * @author Vaadin Ltd */ public class Dragging extends VerticalLayout implements View { SortableLayout sample; public Dragging() { setMargin(true); setSpacing(true); Label h1 = new Label("Dragging Components"); h1.addStyleName("h1"); addComponent(h1); MenuBar options = new MenuBar(); options.setCaption("Drop Hints"); addComponent(options); // Use these styles to hide irrelevant drag hints // Can be used either on a parent or directly on the DnDWrapper MenuItem opt = options.addItem("Vertical", new MenuBar.Command() { @Override public void menuSelected(MenuItem selectedItem) { if (selectedItem.isChecked()) { sample.removeStyleName("no-vertical-drag-hints"); } else { sample.addStyleName("no-vertical-drag-hints"); } } }); opt.setCheckable(true); opt.setChecked(true); opt = options.addItem("Horizontal", new MenuBar.Command() { @Override public void menuSelected(MenuItem selectedItem) { if (selectedItem.isChecked()) { sample.removeStyleName("no-horizontal-drag-hints"); } else { sample.addStyleName("no-horizontal-drag-hints"); } } }); opt.setCheckable(true); opt.setChecked(true); opt = options.addItem("Box", new MenuBar.Command() { @Override public void menuSelected(MenuItem selectedItem) { if (selectedItem.isChecked()) { sample.removeStyleName("no-box-drag-hints"); } else { sample.addStyleName("no-box-drag-hints"); } } }); opt.setCheckable(true); opt.setChecked(true); sample = new SortableLayout(); sample.setSizeUndefined(); sample.setHeight("100px"); for (final Component component : createComponents()) { sample.addComponent(component); } addComponent(sample); } private List<Component> createComponents() { final List<Component> components = new ArrayList<Component>(); final Label label = new Label("This is a long text block that will wrap."); label.setWidth("120px"); components.add(label); final Embedded image = new Embedded("", new ThemeResource("../runo/icons/64/document.png")); components.add(image); final CssLayout documentLayout = new CssLayout(); documentLayout.setWidth("19px"); for (int i = 0; i < 5; ++i) { final Embedded e = new Embedded(null, new ThemeResource("../runo/icons/16/document.png")); e.setHeight("16px"); e.setWidth("16px"); documentLayout.addComponent(e); } components.add(documentLayout); final VerticalLayout buttonLayout = new VerticalLayout(); final Button button = new Button("Button"); button.addClickListener(new Button.ClickListener() { @Override public void buttonClick(final ClickEvent event) { Notification.show("Button clicked"); } }); buttonLayout.addComponent(button); buttonLayout.setComponentAlignment(button, Alignment.MIDDLE_CENTER); components.add(buttonLayout); return components; } private static class ReorderLayoutDropHandler implements DropHandler { private final AbstractOrderedLayout layout; public ReorderLayoutDropHandler(final AbstractOrderedLayout layout) { this.layout = layout; } @Override public AcceptCriterion getAcceptCriterion() { return new Not(SourceIsTarget.get()); } @Override public void drop(final DragAndDropEvent dropEvent) { final Transferable transferable = dropEvent.getTransferable(); final Component sourceComponent = transferable.getSourceComponent(); if (sourceComponent instanceof WrappedComponent) { final TargetDetails dropTargetData = dropEvent.getTargetDetails(); final DropTarget target = dropTargetData.getTarget(); // find the location where to move the dragged component boolean sourceWasAfterTarget = true; int index = 0; final Iterator<Component> componentIterator = layout.getComponentIterator(); Component next = null; while (next != target && componentIterator.hasNext()) { next = componentIterator.next(); if (next != sourceComponent) { index++; } else { sourceWasAfterTarget = false; } } if (next == null || next != target) { // component not found - if dragging from another layout return; } // drop on top of target? if (dropTargetData.getData("horizontalLocation").equals(HorizontalDropLocation.CENTER.toString())) { if (sourceWasAfterTarget) { index--; } } // drop before the target? else if (dropTargetData.getData("horizontalLocation") .equals(HorizontalDropLocation.LEFT.toString())) { index--; if (index < 0) { index = 0; } } // move component within the layout layout.removeComponent(sourceComponent); layout.addComponent(sourceComponent, index); } } } private static class SortableLayout extends CustomComponent { private final AbstractOrderedLayout layout; private final DropHandler dropHandler; public SortableLayout() { layout = new HorizontalLayout(); layout.setMargin(true); dropHandler = new ReorderLayoutDropHandler(layout); // final DragAndDropWrapper pane = new DragAndDropWrapper(layout); setCompositionRoot(layout); } public void addComponent(final Component component) { final WrappedComponent wrapper = new WrappedComponent(component, dropHandler); wrapper.setSizeUndefined(); component.setHeight("100%"); wrapper.setHeight("100%"); layout.addComponent(wrapper); } } private static class WrappedComponent extends DragAndDropWrapper { private final DropHandler dropHandler; public WrappedComponent(final Component content, final DropHandler dropHandler) { super(content); this.dropHandler = dropHandler; setDragStartMode(DragStartMode.WRAPPER); } @Override public DropHandler getDropHandler() { return dropHandler; } } @Override public void enter(ViewChangeEvent event) { // TODO Auto-generated method stub } }