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/*******************************************************************************
* 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 (Object arg : arguments) {
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 ();
}
}
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