| 1 | package org.danvk; |
| 2 | |
| 3 | import com.google.gwt.core.client.GWT; |
| 4 | import com.google.gwt.dom.client.Document; |
| 5 | import com.google.gwt.dom.client.ScriptElement; |
| 6 | import com.google.gwt.resources.client.ClientBundle; |
| 7 | import com.google.gwt.resources.client.TextResource; |
| 8 | |
| 9 | /** |
| 10 | * Methods for installing Dygraphs source in a GWT document. |
| 11 | * |
| 12 | * @author flooey@google.com (Adam Vartanian) |
| 13 | */ |
| 14 | public class Dygraphs { |
| 15 | |
| 16 | // Protected because the GWT compiler has to generate a subclass. |
| 17 | protected interface Resources extends ClientBundle { |
| 18 | @Source("org/danvk/dygraph-combined.js") |
| 19 | TextResource dygraphs(); |
| 20 | } |
| 21 | |
| 22 | private static final Resources RESOURCES = GWT.create(Resources.class); |
| 23 | private static boolean installed = false; |
| 24 | |
| 25 | /** |
| 26 | * Install the Dygraphs JavaScript source into the current document. This |
| 27 | * method is idempotent. |
| 28 | */ |
| 29 | public static synchronized void install() { |
| 30 | if (!installed) { |
| 31 | ScriptElement e = Document.get().createScriptElement(); |
| 32 | e.setText(RESOURCES.dygraphs().getText()); |
| 33 | Document.get().getBody().appendChild(e); |
| 34 | installed = true; |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | // Prevent construction |
| 39 | private Dygraphs() { } |
| 40 | |
| 41 | } |