Java tutorial
/* * Copyright 2011 Henri Kerola * * 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.vaadin.gwtgraphics.client; import java.util.ArrayList; import java.util.List; import org.vaadin.gwtgraphics.client.impl.SVGImpl; import com.google.gwt.core.client.GWT; import com.google.gwt.dom.client.DivElement; import com.google.gwt.dom.client.Document; import com.google.gwt.dom.client.Element; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.event.dom.client.DoubleClickEvent; import com.google.gwt.event.dom.client.DoubleClickHandler; import com.google.gwt.event.dom.client.HasAllMouseHandlers; import com.google.gwt.event.dom.client.HasClickHandlers; import com.google.gwt.event.dom.client.HasDoubleClickHandlers; import com.google.gwt.event.dom.client.MouseDownEvent; import com.google.gwt.event.dom.client.MouseDownHandler; import com.google.gwt.event.dom.client.MouseMoveEvent; import com.google.gwt.event.dom.client.MouseMoveHandler; import com.google.gwt.event.dom.client.MouseOutEvent; import com.google.gwt.event.dom.client.MouseOutHandler; import com.google.gwt.event.dom.client.MouseOverEvent; import com.google.gwt.event.dom.client.MouseOverHandler; import com.google.gwt.event.dom.client.MouseUpEvent; import com.google.gwt.event.dom.client.MouseUpHandler; import com.google.gwt.event.dom.client.MouseWheelEvent; import com.google.gwt.event.dom.client.MouseWheelHandler; import com.google.gwt.event.shared.HandlerRegistration; import com.google.gwt.user.client.ui.Widget; /** * The following example shows how a DrawingArea instance is created and added * to a GWT application. A rectangle is added to this DrawingArea instance. When * the user clicks this rectangle its color changes. * * <pre> * DrawingArea canvas = new DrawingArea(200, 200); * RootPanel.get().add(canvas); * * Rectangle rect = new Rectangle(10, 10, 100, 50); * canvas.add(rect); * rect.setFillColor("blue"); * rect.addClickHandler(new ClickHandler() { * public void onClick(ClickEvent event) { * Rectangle rect = (Rectangle) event.getSource(); * if (rect.getFillColor().equals("blue")) { * rect.setFillColor("red"); * } else { * rect.setFillColor("blue"); * } * } * }); * </pre> * * @author Henri Kerola * */ public class DrawingArea extends Widget implements VectorObjectContainer, HasClickHandlers, HasAllMouseHandlers, HasDoubleClickHandlers { private static final SVGImpl impl = GWT.create(SVGImpl.class); private final Element root; private List<VectorObject> childrens = new ArrayList<VectorObject>(); /** * Creates a DrawingArea of given width and height. * * @param width * the width of DrawingArea in pixels * @param height * the height of DrawingArea in pixels */ public DrawingArea(int width, int height) { DivElement container = Document.get().createDivElement(); setElement(container); root = getImpl().createDrawingArea(container, width, height); } protected SVGImpl getImpl() { return impl; } /** * Returns a String that indicates what graphics renderer is used. This * String is "VML" for Internet Explorer and "SVG" for other browsers. * * @return the used graphics renderer */ public String getRendererString() { return getImpl().getRendererString(); } /* * (non-Javadoc) * * @see org.vaadin.gwtgraphics.client.VectorObjectContainer#add(org.vaadin. * gwtgraphics.client.VectorObject) */ public VectorObject add(VectorObject vo) { getImpl().add(root, vo.getElement(), vo.isAttached()); vo.setParent(this); childrens.add(vo); return vo; } /* * (non-Javadoc) * * @see * org.vaadin.gwtgraphics.client.VectorObjectContainer#insert(org.vaadin * .gwtgraphics.client.VectorObject, int) */ public VectorObject insert(VectorObject vo, int beforeIndex) { if (beforeIndex < 0 || beforeIndex > getVectorObjectCount()) { throw new IndexOutOfBoundsException(); } if (childrens.contains(vo)) { childrens.remove(vo); } childrens.add(beforeIndex, vo); vo.setParent(this); getImpl().insert(root, vo.getElement(), beforeIndex, vo.isAttached()); return vo; } /* * (non-Javadoc) * * @see * org.vaadin.gwtgraphics.client.VectorObjectContainer#bringToFront(org. * vaadin.gwtgraphics.client.VectorObject) */ public VectorObject bringToFront(VectorObject vo) { if (vo.getParent() != this) { return null; } getImpl().bringToFront(root, vo.getElement()); return vo; } /* * (non-Javadoc) * * @see * org.vaadin.gwtgraphics.client.VectorObjectContainer#remove(org.vaadin * .gwtgraphics.client.VectorObject) */ public VectorObject remove(VectorObject vo) { if (vo.getParent() != this) { return null; } vo.setParent(null); root.removeChild(vo.getElement()); childrens.remove(vo); return vo; } /* * (non-Javadoc) * * @see org.vaadin.gwtgraphics.client.VectorObjectContainer#clear() */ public void clear() { List<VectorObject> childrensCopy = new ArrayList<VectorObject>(); childrensCopy.addAll(childrens); for (VectorObject vo : childrensCopy) { this.remove(vo); } } /* * (non-Javadoc) * * @see * org.vaadin.gwtgraphics.client.VectorObjectContainer#getVectorObject(int) */ public VectorObject getVectorObject(int index) { return childrens.get(index); } /* * (non-Javadoc) * * @see * org.vaadin.gwtgraphics.client.VectorObjectContainer#getVectorObjectCount * () */ public int getVectorObjectCount() { return childrens.size(); } /** * Returns the width of the DrawingArea in pixels. * * @return the width of the DrawingArea in pixels. */ public int getWidth() { return getImpl().getWidth(root); } /** * Sets the width of the DrawingArea in pixels. * * @param width * the new width in pixels */ public void setWidth(int width) { getImpl().setWidth(root, width); } /** * Returns the height of the DrawingArea in pixels. * * @return the height of the DrawingArea in pixels. */ public int getHeight() { return getImpl().getHeight(root); } /** * Sets the height of the DrawingArea in pixels. * * @param height * the new height */ public void setHeight(int height) { getImpl().setHeight(root, height); } /* * (non-Javadoc) * * @see com.google.gwt.user.client.ui.UIObject#setHeight(java.lang.String) */ @Override public void setHeight(String height) { boolean successful = false; if (height != null && height.endsWith("px")) { try { setHeight(Integer.parseInt(height.substring(0, height.length() - 2))); successful = true; } catch (NumberFormatException e) { } } if (!successful) { throw new IllegalArgumentException("Only pixel units (px) are supported"); } } /* * (non-Javadoc) * * @see com.google.gwt.user.client.ui.UIObject#setWidth(java.lang.String) */ @Override public void setWidth(String width) { boolean successful = false; if (width != null && width.endsWith("px")) { try { setWidth(Integer.parseInt(width.substring(0, width.length() - 2))); successful = true; } catch (NumberFormatException e) { } } if (!successful) { throw new IllegalArgumentException("Only pixel units (px) are supported"); } } /* * (non-Javadoc) * * @see * com.google.gwt.user.client.ui.UIObject#setStyleName(java.lang.String) */ @Override public void setStyleName(String style) { getElement().setClassName(style + " " + style + "-" + getImpl().getStyleSuffix()); } /* * (non-Javadoc) * * @see * com.google.gwt.event.dom.client.HasClickHandlers#addClickHandler(com. * google.gwt.event.dom.client.ClickHandler) */ public HandlerRegistration addClickHandler(ClickHandler handler) { return addDomHandler(handler, ClickEvent.getType()); } /* * (non-Javadoc) * * @see * com.google.gwt.event.dom.client.HasDoubleClickHandlers#addDoubleClickHandler * (com.google.gwt.event.dom.client.DoubleClickHandler) */ public HandlerRegistration addDoubleClickHandler(DoubleClickHandler handler) { return addDomHandler(handler, DoubleClickEvent.getType()); } /* * (non-Javadoc) * * @see * com.google.gwt.event.dom.client.HasMouseDownHandlers#addMouseDownHandler * (com.google.gwt.event.dom.client.MouseDownHandler) */ public HandlerRegistration addMouseDownHandler(MouseDownHandler handler) { return addDomHandler(handler, MouseDownEvent.getType()); } /* * (non-Javadoc) * * @see * com.google.gwt.event.dom.client.HasMouseUpHandlers#addMouseUpHandler( * com.google.gwt.event.dom.client.MouseUpHandler) */ public HandlerRegistration addMouseUpHandler(MouseUpHandler handler) { return addDomHandler(handler, MouseUpEvent.getType()); } /* * (non-Javadoc) * * @see * com.google.gwt.event.dom.client.HasMouseOutHandlers#addMouseOutHandler * (com.google.gwt.event.dom.client.MouseOutHandler) */ public HandlerRegistration addMouseOutHandler(MouseOutHandler handler) { return addDomHandler(handler, MouseOutEvent.getType()); } /* * (non-Javadoc) * * @see * com.google.gwt.event.dom.client.HasMouseOverHandlers#addMouseOverHandler * (com.google.gwt.event.dom.client.MouseOverHandler) */ public HandlerRegistration addMouseOverHandler(MouseOverHandler handler) { return addDomHandler(handler, MouseOverEvent.getType()); } /* * (non-Javadoc) * * @see * com.google.gwt.event.dom.client.HasMouseMoveHandlers#addMouseMoveHandler * (com.google.gwt.event.dom.client.MouseMoveHandler) */ public HandlerRegistration addMouseMoveHandler(MouseMoveHandler handler) { return addDomHandler(handler, MouseMoveEvent.getType()); } /* * (non-Javadoc) * * @see * com.google.gwt.event.dom.client.HasMouseWheelHandlers#addMouseWheelHandler * (com.google.gwt.event.dom.client.MouseWheelHandler) */ public HandlerRegistration addMouseWheelHandler(MouseWheelHandler handler) { return addDomHandler(handler, MouseWheelEvent.getType()); } /* * (non-Javadoc) * * @see com.google.gwt.user.client.ui.Widget#doAttachChildren() */ @Override protected void doAttachChildren() { for (VectorObject vo : childrens) { vo.onAttach(); } } /* * (non-Javadoc) * * @see com.google.gwt.user.client.ui.Widget#doDetachChildren() */ @Override protected void doDetachChildren() { for (VectorObject vo : childrens) { vo.onDetach(); } } }