| /* |
| * Copyright 2002,2004 The Apache Software Foundation. |
| * |
| * 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.apache.commons.jelly.tags.swt; |
| |
| import java.io.InputStream; |
| import org.apache.commons.jelly.JellyTagException; |
| import org.apache.commons.jelly.TagSupport; |
| import org.apache.commons.jelly.XMLOutput; |
| import org.apache.commons.jelly.util.ClassLoaderUtils; |
| import org.eclipse.swt.graphics.Image; |
| import org.eclipse.swt.widgets.Button; |
| import org.eclipse.swt.widgets.Decorations; |
| import org.eclipse.swt.widgets.Display; |
| import org.eclipse.swt.widgets.Item; |
| import org.eclipse.swt.widgets.Label; |
| import org.eclipse.swt.widgets.Widget; |
| |
| /** |
| * This creates an image on the parent Widget. |
| * |
| * @author <a href="mailto:ckl@dacelo.nl">Christiaan ten Klooster</a> |
| * @version CVS ImageTag.java,v 1.5 2004/09/07 02:41:40 dion Exp |
| */ |
| public class ImageTag extends TagSupport { |
| |
| /** path to file */ |
| private String src; |
| |
| /** variable name, if specified */ |
| private String var; |
| |
| /** resource name, if specified */ |
| private String resource; |
| |
| /** |
| * Sets the resource |
| * @param resource image resource location |
| */ |
| public void setResource(String resource) { |
| this.resource = resource; |
| } |
| |
| /** |
| * Obtains the resource |
| * @return the image resource |
| */ |
| public String getResource() { |
| return resource; |
| } |
| |
| /** |
| * Sets the variable name |
| */ |
| public void setVar(String var) { |
| this.var = var; |
| } |
| |
| /** |
| * Obtain the variable name. |
| * @return String the variable name |
| */ |
| public String getVar() { |
| return this.var; |
| } |
| |
| /** |
| * Sets the src. |
| * @param src The src to set |
| */ |
| public void setSrc(String src) { |
| this.src = src; |
| } |
| |
| /** |
| * Method getSrc. |
| * @return String |
| */ |
| public String getSrc() { |
| return src; |
| } |
| |
| /** |
| * @return the parent widget which this widget will be added to. |
| */ |
| public Widget getParentWidget() { |
| WidgetTag tag = (WidgetTag) findAncestorWithClass(WidgetTag.class); |
| if (tag != null) { |
| return tag.getWidget(); |
| } |
| return null; |
| } |
| |
| // Tag interface |
| //------------------------------------------------------------------------- |
| |
| /** |
| * @see org.apache.commons.jelly.Tag#doTag(org.apache.commons.jelly.XMLOutput) |
| */ |
| public void doTag(XMLOutput output) throws JellyTagException { |
| // invoke by body just in case some nested tag configures me |
| invokeBody(output); |
| |
| Widget parent = getParentWidget(); |
| |
| if (parent == null) { |
| throw new JellyTagException("This tag must be nested within a Widget or a Window"); |
| } |
| |
| Image image = null; |
| |
| if (getSrc() != null) { |
| image = loadLocalImage(parent.getDisplay()); |
| } else if (getResource() != null) { |
| image = loadResourceImage(parent.getDisplay()); |
| } else { |
| throw new JellyTagException("Either an image location or a resource must be specified"); |
| } |
| |
| setWidgetImage(parent, image); |
| |
| // store the image as a context variable if specified |
| if (var != null) { |
| context.setVariable(var, image); |
| } |
| } |
| |
| /** |
| * Creates an Image, loaded from the local disk |
| */ |
| private Image loadLocalImage(Display display) { |
| return new Image(display, getSrc()); |
| } |
| |
| /** |
| * Creates an Image, loaded from a specified resource. |
| */ |
| private Image loadResourceImage(Display display) { |
| ClassLoader loader = ClassLoaderUtils.getClassLoader(null, getContext().getUseContextClassLoader(), getClass()); |
| InputStream stream = loader.getResourceAsStream(getResource()); |
| return new Image(display, stream); |
| } |
| |
| /** |
| * Add image to a widget |
| * @param parent |
| * @param image |
| * @throws JellyTagException |
| */ |
| protected void setWidgetImage(Widget parent, Image image) throws JellyTagException { |
| if (parent instanceof Label) { |
| Label label = (Label) parent; |
| label.setImage(image); |
| |
| } else if (parent instanceof Button) { |
| Button button = (Button) parent; |
| button.setImage(image); |
| |
| } else if (parent instanceof Item) { |
| Item item = (Item) parent; |
| item.setImage(image); |
| |
| } else if (parent instanceof Decorations) { |
| Decorations item = (Decorations) parent; |
| item.setImage(image); |
| |
| } else { |
| throw new JellyTagException("This tag must be nested inside a <label>, <button>, <shell> or <item> tag"); |
| } |
| } |
| } |