| /******************************************************************************* |
| * Copyright (c) 2000, 2018 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.snippets; |
| |
| /* |
| * Browser example snippet: call Java from JavaScript. |
| * |
| * For a list of all SWT example snippets see |
| * http://www.eclipse.org/swt/snippets/ |
| * |
| * @since 3.5 |
| */ |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.browser.*; |
| import org.eclipse.swt.layout.*; |
| import org.eclipse.swt.widgets.*; |
| |
| public class Snippet307 { |
| |
| public static void main (String [] args) { |
| Display display = new Display (); |
| Shell shell = new Shell (display); |
| shell.setText("Snippet 307"); |
| shell.setLayout (new FillLayout ()); |
| shell.setBounds (10,10,300,200); |
| |
| final Browser browser; |
| try { |
| browser = new Browser (shell, SWT.NONE); |
| } catch (SWTError e) { |
| System.out.println ("Could not instantiate Browser: " + e.getMessage ()); |
| display.dispose(); |
| return; |
| } |
| browser.setText (createHTML ()); |
| final BrowserFunction function = new CustomFunction (browser, "theJavaFunction"); |
| |
| browser.addProgressListener(ProgressListener.completedAdapter(event -> { |
| browser.addLocationListener(new LocationAdapter() { |
| @Override |
| public void changed(LocationEvent event) { |
| browser.removeLocationListener(this); |
| System.out.println("left java function-aware page, so disposed CustomFunction"); |
| function.dispose(); |
| } |
| }); |
| })); |
| |
| shell.open (); |
| while (!shell.isDisposed ()) { |
| if (!display.readAndDispatch ()) |
| display.sleep (); |
| } |
| display.dispose (); |
| } |
| |
| static class CustomFunction extends BrowserFunction { |
| CustomFunction (Browser browser, String name) { |
| super (browser, name); |
| } |
| @Override |
| public Object function (Object[] arguments) { |
| System.out.println ("theJavaFunction() called from javascript with args:"); |
| for (int i = 0; i < arguments.length; i++) { |
| Object arg = arguments[i]; |
| if (arg == null) { |
| System.out.println ("\t-->null"); |
| } else { |
| System.out.println ("\t-->" + arg.getClass ().getName () + ": " + arg.toString ()); |
| } |
| } |
| Object returnValue = new Object[] { |
| Short.valueOf ((short)3), |
| true, |
| null, |
| new Object[] {"a string", false}, |
| "hi", |
| Float.valueOf (2.0f / 3.0f), |
| }; |
| //int z = 3 / 0; // uncomment to cause a java error instead |
| return returnValue; |
| } |
| } |
| |
| static String createHTML () { |
| StringBuilder buffer = new StringBuilder (); |
| buffer.append ("<html>\n"); |
| buffer.append ("<head>\n"); |
| buffer.append ("<script language=\"JavaScript\">\n"); |
| buffer.append ("function function1() {\n"); |
| buffer.append (" var result;\n"); |
| buffer.append (" try {\n"); |
| buffer.append (" result = theJavaFunction(12, false, null, [3.6, ['swt', true]], 'eclipse');\n"); |
| buffer.append (" } catch (e) {\n"); |
| buffer.append (" alert('a java error occurred: ' + e.message);\n"); |
| buffer.append (" return;\n"); |
| buffer.append (" }\n"); |
| buffer.append (" for (var i = 0; i < result.length; i++) {\n"); |
| buffer.append (" alert('returned ' + i + ': ' + result[i]);\n"); |
| buffer.append (" }\n"); |
| buffer.append ("}\n"); |
| buffer.append ("</script>\n"); |
| buffer.append ("</head>\n"); |
| buffer.append ("<body>\n"); |
| buffer.append ("<input id=button type=\"button\" value=\"Push to Invoke Java\" onclick=\"function1();\">\n"); |
| buffer.append ("<p><a href=\"http://www.eclipse.org\">go to eclipse.org</a>\n"); |
| buffer.append ("</body>\n"); |
| buffer.append ("</html>\n"); |
| return buffer.toString (); |
| } |
| |
| } |
