/* * Smart GWT (GWT for SmartClient) * Copyright 2008 and beyond, Isomorphic Software, Inc. * * Smart GWT 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. Smart GWT 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. */ import com.smartgwt.client.types.Alignment; import com.smartgwt.client.types.Overflow; import com.smartgwt.client.util.EventHandler; import com.smartgwt.client.widgets.Canvas; import com.smartgwt.client.widgets.Label; import com.smartgwt.client.widgets.events.*; import com.google.gwt.core.client.EntryPoint; public class MouseEventsSample implements EntryPoint { public void onModuleLoad() { Canvas canvas = new Canvas(); final TrackerLabel eventTrackerLabel = new TrackerLabel(); eventTrackerLabel.setContents("
Last event: (mouse over the canvas below...)
"); eventTrackerLabel.setHeight(20); final MouserLabel label = new MouserLabel(); label.setContents("
Mouse Me
"); label.setAlign(Alignment.CENTER); label.setOverflow(Overflow.HIDDEN); label.setShowEdges(true); label.setBackgroundColor("lightblue"); label.setWidth(200); label.setHeight(200); label.setTop(40); label.addMouseWheelHandler(new MouseWheelHandler() { public void onMouseWheel(MouseWheelEvent event) { float wheelDelta = EventHandler.getWheelDelta(); int newSize = (int)(label.getWidth() + wheelDelta * label.getZoomMultiplier()); if (newSize < label.getMinSize()) { newSize = label.getMinSize(); } else if (newSize > label.getMaxSize()) { newSize = label.getMaxSize(); } label.setWidth(newSize); label.setHeight(newSize); eventTrackerLabel.setLastEvent("mouseWheel", label); } }); label.addMouseStillDownHandler(new MouseStillDownHandler() { public void onMouseStillDown(MouseStillDownEvent event) { Integer opacity = label.getOpacity(); if (opacity == null) opacity = 100; label.setOpacity(Math.max(0, opacity - 5)); eventTrackerLabel.setLastEvent("mouseStillDown", label); } }); label.addMouseUpHandler(new MouseUpHandler() { public void onMouseUp(MouseUpEvent event) { label.setOpacity(100); eventTrackerLabel.setLastEvent("mouseUp", label); } }); label.addMouseMoveHandler(new MouseMoveHandler() { public void onMouseMove(MouseMoveEvent event) { //scale to 1 float xScale = (label.getOffsetX() * 1f) / label.getWidth(); float yScale = (label.getOffsetY() * 1f) / label.getHeight(); // increasing red intensity on the x axis, green on the y axis. Blue stays at zero. label.setBackgroundColor("rgb(0," + Math.round(255 * xScale) + "," + Math.round(255 * yScale) + ")"); eventTrackerLabel.setLastEvent("mouseMove", label); } }); label.addMouseOutHandler(new MouseOutHandler() { public void onMouseOut(MouseOutEvent event) { //restore settings label.setBackgroundColor("lightblue"); label.setOpacity(100); eventTrackerLabel.setLastEvent("mouseOut", label); } }); canvas.addChild(eventTrackerLabel); canvas.addChild(label); canvas.draw(); } class TrackerLabel extends Label { public void setLastEvent(String eventName, MouserLabel label) { int localX = label.getOffsetX(); int localY = label.getOffsetY(); setContents("
Last event:
" + eventName + "
(" + localX + ", " + localY + ")
"); } } class MouserLabel extends Label { private int minSize = 40; private int maxSize = 400; private int zoomMultiplier = 15; public int getMinSize() { return minSize; } public void setMinSize(int minSize) { this.minSize = minSize; } public int getMaxSize() { return maxSize; } public void setMaxSize(int maxSize) { this.maxSize = maxSize; } public int getZoomMultiplier() { return zoomMultiplier; } public void setZoomMultiplier(int zoomMultiplier) { this.zoomMultiplier = zoomMultiplier; } } }