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SelectAllHandler.java
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SelectAllHandler.java
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/*******************************************************************************
* Copyright (c) 2004, 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.ui.internal.handlers;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.internal.ExceptionHandler;
/**
* This handler is an adaptation of the widget method handler allowing select
* all to work even in some cases where the "selectAll" method does not exist.
* This handler attempts to use "getTextLimit" and "setSelection" to do select
* all. If this doesn't work, then it finally fails.
*
* @since 3.0
*/
public class SelectAllHandler extends WidgetMethodHandler {
/**
* The parameters for a single point select all.
*/
private static final Class<?>[] METHOD_PARAMETERS = { Point.class };
@Override
public final Object execute(final ExecutionEvent event) throws ExecutionException {
final Method methodToExecute = getMethodToExecute();
if (methodToExecute != null) {
try {
final Control focusControl = Display.getCurrent().getFocusControl();
final int numParams = methodToExecute.getParameterTypes().length;
if ((focusControl instanceof Composite)
&& ((focusControl.getStyle() & SWT.EMBEDDED) != 0)) {
// we only support selectAll for swing components
if (numParams != 0) {
return null;
}
/*
* Okay. Have a seat. Relax a while. This is going to be a bumpy ride. If it is
* an embedded widget, then it *might* be a Swing widget. At the point where
* this handler is executing, the key event is already bound to be swallowed. If
* I don't do something, then the key will be gone for good. So, I will try to
* forward the event to the Swing widget. Unfortunately, we can't even count on
* the Swing libraries existing, so I need to use reflection everywhere. And, to
* top it off, I need to dispatch the event on the Swing event queue, which
* means that it will be carried out asynchronously to the SWT event queue.
*/
try {
final Object focusComponent = getFocusComponent();
if (focusComponent != null) {
Runnable methodRunnable = () -> {
try {
methodToExecute.invoke(focusComponent);
// and back to the UI thread :-)
focusControl.getDisplay().asyncExec(() -> {
if (!focusControl.isDisposed()) {
focusControl.notifyListeners(SWT.Selection, null);
}
});
} catch (final IllegalAccessException e1) {
// The method is protected, so do
// nothing.
} catch (final InvocationTargetException e2) {
/*
* I would like to log this exception -- and possibly show a dialog to the user
* -- but I have to go back to the SWT event loop to do this. So, back we go....
*/
focusControl.getDisplay()
.asyncExec(() -> ExceptionHandler.getInstance()
.handleException(new ExecutionException(
"An exception occurred while executing " //$NON-NLS-1$
+ methodToExecute.getName(),
e2.getTargetException())));
}
};
swingInvokeLater(methodRunnable);
}
} catch (final ClassNotFoundException e) {
// There is no Swing support, so do nothing.
} catch (final NoSuchMethodException e) {
// The API has changed, which seems amazingly unlikely.
throw new Error("Something is seriously wrong here"); //$NON-NLS-1$
}
} else if (numParams == 0) {
// This is a no-argument selectAll method.
methodToExecute.invoke(focusControl);
focusControl.notifyListeners(SWT.Selection, null);
} else if (numParams == 1) {
// This is a single-point selection method.
final Method textLimitAccessor = focusControl.getClass().getMethod("getTextLimit"); //$NON-NLS-1$
final Integer textLimit = (Integer) textLimitAccessor.invoke(focusControl);
final Object[] parameters = { new Point(0, textLimit.intValue()) };
methodToExecute.invoke(focusControl, parameters);
if (!(focusControl instanceof Combo)) {
focusControl.notifyListeners(SWT.Selection, null);
}
} else {
/*
* This means that getMethodToExecute() has been changed, while this method
* hasn't.
*/
throw new ExecutionException("Too many parameters on select all", new Exception()); //$NON-NLS-1$
}
} catch (InvocationTargetException e) {
throw new ExecutionException("An exception occurred while executing " //$NON-NLS-1$
+ getMethodToExecute(), e.getTargetException());
} catch (IllegalAccessException | NoSuchMethodException e) {
// I can't get the text limit. Do nothing.
}
}
return null;
}
/**
* Looks up the select all method on the given focus control.
*
* @return The method on the focus control; <code>null</code> if none.
*/
@Override
protected Method getMethodToExecute() {
Method method = super.getMethodToExecute();
// Let's see if we have a control that supports point-based selection.
if (method == null) {
final Control focusControl = Display.getCurrent().getFocusControl();
if (focusControl != null) {
try {
method = focusControl.getClass().getMethod("setSelection", //$NON-NLS-1$
METHOD_PARAMETERS);
} catch (NoSuchMethodException e) {
// Do nothing.
}
}
}
return method;
}
/**
* @see org.eclipse.core.runtime.IExecutableExtension#setInitializationData(org.eclipse.core.runtime.IConfigurationElement,
* java.lang.String, java.lang.Object)
*/
@Override
public void setInitializationData(IConfigurationElement config, String propertyName, Object data) {
// The name is always "selectAll".
methodName = "selectAll"; //$NON-NLS-1$
}
}