Draggable image (Smart GWT)
/* * SmartGWT (GWT for SmartClient) * Copyright 2008 and beyond, Isomorphic Software, Inc. * * SmartGWT is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License version 3 * as published by the Free Software Foundation. SmartGWT is also * available under typical commercial license terms - see * http://smartclient.com/license * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. */ package com.smartgwt.sample.showcase.client; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.user.client.ui.RootPanel; import com.smartgwt.client.widgets.Canvas; import com.smartgwt.client.widgets.Img; import com.smartgwt.client.widgets.events.ClickEvent; import com.smartgwt.client.widgets.events.ClickHandler; import com.smartgwt.client.widgets.events.MouseStillDownEvent; import com.smartgwt.client.widgets.events.MouseStillDownHandler; import com.smartgwt.client.widgets.layout.HLayout; import com.smartgwt.client.widgets.layout.VLayout; public class Showcase implements EntryPoint{ public void onModuleLoad() { RootPanel.get().add(getViewPanel()); } public Canvas getViewPanel() { VLayout layout = new VLayout(); layout.setMembersMargin(10); layout.setAutoHeight(); HLayout hLayout = new HLayout(); final Img vanImg = new Img("crystal/128/apps/virussafe.png", 96, 96); vanImg.setCanDragReposition(true); vanImg.setTop(0); vanImg.setLeft(50); Img resetImg = new Img("icons/48/reset.png", 48, 48); resetImg.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { vanImg.moveTo(50, 0); } }); Img moveImg = new Img("icons/48/downright.png", 48, 48); moveImg.setShowRollOver(true); moveImg.addMouseStillDownHandler(new MouseStillDownHandler() { public void onMouseStillDown(MouseStillDownEvent event) { vanImg.moveBy(20, 20); } }); hLayout.addMember(resetImg); hLayout.addMember(moveImg); //were positioning the vanImg using absolute poitioning relative to its containing canvas Canvas vanCanvas = new Canvas(); vanCanvas.addChild(vanImg); layout.addMember(hLayout); layout.addMember(vanCanvas); return layout; } }