| /* |
| * 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 org.apache.commons.jelly.JellyTagException; |
| import org.apache.commons.jelly.TagSupport; |
| import org.apache.commons.jelly.XMLOutput; |
| import org.eclipse.swt.graphics.Drawable; |
| import org.eclipse.swt.graphics.GC; |
| |
| /** |
| * Class to create a {@link GC} instance within Jelly SWT. |
| * |
| * @author <a href="mailto:crafterm@apache.org">Marcus Crafter</a> |
| * @version CVS $Id: GCTag.java,v 1.2 2004/09/09 12:20:26 dion Exp $ |
| */ |
| public class GCTag extends TagSupport { |
| |
| /** Drawable name */ |
| private Drawable drawable; |
| |
| /** Variable name */ |
| private String var; |
| |
| /** |
| * Obtain the {@link Drawable} name for this {@link GC}. |
| * |
| * @return a {@link GC} {@link Drawable} |
| */ |
| public Drawable getDrawable() { |
| return this.drawable; |
| } |
| |
| /** |
| * Set the {@link Drawable} name for this {@link GC}. |
| * |
| * @param drawable a {@link GC} {@link Drawable} |
| */ |
| public void setDrawable(final Drawable drawable) { |
| this.drawable = drawable; |
| } |
| |
| /** |
| * Sets the variable name. |
| * |
| * @param var the variable name of this {@link GC} instance |
| */ |
| public void setVar(final String var) { |
| this.var = var; |
| } |
| |
| /** |
| * Obtain the variable name. |
| * |
| * @return the variable name of this {@link GC} instance |
| */ |
| public String getVar() { |
| return this.var; |
| } |
| |
| // Tag interface |
| //------------------------------------------------------------------------- |
| |
| /** |
| * Creates a {@link GC} instance and stores it in the Context under a |
| * particular variable name. Note, {@link GC} objects can only be created on |
| * {@link Drawable} objects. |
| * |
| * @param output {@link XMLOutput} reference |
| * @throws JellyTagException if an error occurs |
| * @see org.apache.commons.jelly.Tag#doTag(org.apache.commons.jelly.XMLOutput) |
| */ |
| public void doTag(final XMLOutput output) throws JellyTagException { |
| // invoke by body just in case some nested tag configures me |
| invokeBody(output); |
| |
| final boolean nullDrawable = drawable == null; |
| final boolean drawableParent = drawable instanceof Drawable; |
| |
| if (nullDrawable || !drawableParent) { |
| throw new JellyTagException( |
| "This tag must specify a Drawable attribute (ie. Image or Control)" |
| ); |
| } |
| |
| if (var == null) { |
| throw new JellyTagException("This tag requires a context variable name"); |
| } |
| |
| // store the GC in the context |
| context.setVariable(var, new GC(drawable)); |
| } |
| } |