Attachment 239387 Details for Bug 426773 – SelectAllHandler

SelectAllHandler

SelectAllHandler.java (text/plain), 5.71 KB, created by Sebastien Pennec

on 2014-01-28 08:59:47 EST

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Creator: Sebastien Pennec

Created: 2014-01-28 08:59:47 EST

Size: 5.71 KB

patch

obsolete

>package com.lodh.administrator.rcp.commands;
>
>import java.lang.reflect.InvocationTargetException;
>import java.lang.reflect.Method;
>
>import org.eclipse.core.commands.ExecutionException;
>import org.eclipse.e4.core.di.annotations.Execute;
>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;
>
>public class SelectAllHandler extends WidgetMethodHandler {
>
>	/**
>	 * The parameters for a single point select all.
>	 */
>	private static final Class[] METHOD_PARAMETERS = { Point.class };
>
>	
>	public SelectAllHandler() {
>		methodName = "selectAll";
>	}
>	
>	@Execute
>	public final Object execute() 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) && ((((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 = new Runnable() {
>								public void run() {
>									try {
>										methodToExecute.invoke(focusComponent, null);
>										// and back to the UI thread :-)
>										focusControl.getDisplay().asyncExec(new Runnable() {
>											public void run() {
>												if (!focusControl.isDisposed()) {
>													focusControl.notifyListeners(SWT.Selection, null);
>												}
>											}
>										});
>									} catch (final IllegalAccessException e) {
>										// The method is protected, so do
>										// nothing.
>									} catch (final InvocationTargetException e) {
>										/*
>										 * 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(new Runnable() {
>											public void run() {
>												ExceptionHandler.getInstance().handleException(
>														new ExecutionException("An exception occurred while executing " //$NON-NLS-1$
>																+ methodToExecute.getName(), e.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, null);
>					focusControl.notifyListeners(SWT.Selection, null);
>
>				} else if (numParams == 1) {
>					// This is a single-point selection method.
>					final Method textLimitAccessor = focusControl.getClass().getMethod("getTextLimit", NO_PARAMETERS); //$NON-NLS-1$
>					final Integer textLimit = (Integer) textLimitAccessor.invoke(focusControl, null);
>					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 (IllegalAccessException e) {
>				// The method is protected, so do nothing.
>
>			} catch (InvocationTargetException e) {
>				throw new ExecutionException("An exception occurred while executing " //$NON-NLS-1$
>						+ getMethodToExecute(), e.getTargetException());
>
>			} catch (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.
>	 */
>	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;
>	}
>}

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Attachments on bug 426773: 239387 | 239388