import org.eclipse.swt.events.ArmListener; //导入依赖的package包/类
public static void addKeyText(final MenuItem mntm, final String text, final Task t) {
    mntm.setText(text + "\t" + taskKeyMap.get(t)); //$NON-NLS-1$
    mntm.addArmListener(new ArmListener() {
        @Override
        public void widgetArmed(ArmEvent e) {
            mntm.setText(text + "\t" + taskKeyMap.get(t)); //$NON-NLS-1$
        }
    });
}
 

import org.eclipse.swt.events.ArmListener; //导入依赖的package包/类
private void installTooltip(final MenuItem menuItem, final IToolTipTextProvider toolTipTextProvider) {
    final ArmListener armListener = new ArmListener() {

        @Override
        public void widgetArmed(final ArmEvent e) {
            final boolean wasVisible = toolTip.isVisible();
            toolTip.setVisible(false);

            final String toolTipText = toolTipTextProvider.getToolTipText();
            final boolean hasToolTip = toolTipText != null && !toolTipText.isEmpty();

            if (wasVisible) {
                if (hasToolTip) {
                    showToolTip(toolTipText);
                }
            }
            else if (hasToolTip) {
                lastArmListener = this;
                final ArmListener thisListener = this;
                Display.getCurrent().timerExec(400, new Runnable() {

                    @Override
                    public void run() {
                        if (lastArmListener == thisListener) {
                            showToolTip(toolTipText);
                        }
                    }
                });
            }

        }
    };

    if (toolTip != null) {
        menuItem.addArmListener(armListener);
    }
}
 

import org.eclipse.swt.events.ArmListener; //导入依赖的package包/类
/**
 * Adds the listener to the collection of listeners who will be notified
 * when the arm events are generated for the control, by sending it one of
 * the messages defined in the <code>ArmListener</code> interface.
 * 
 * @param listener
 *            the listener which should be notified
 * 
 * @exception IllegalArgumentException
 *                <ul>
 *                <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 *                </ul>
 * @exception SWTException
 *                <ul>
 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
 *                disposed</li>
 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
 *                thread that created the receiver</li>
 *                </ul>
 * 
 * @see ArmListener
 * @see #removeArmListener
 */
public void addArmListener(ArmListener listener) {
	checkWidget();
	if (listener == null)
		error(SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener(listener);
	addListener(SWT.Arm, typedListener);
}
 

import org.eclipse.swt.events.ArmListener; //导入依赖的package包/类
/**
 * Removes the listener from the collection of listeners who will be
 * notified when the arm events are generated for the control.
 * 
 * @param listener
 *            the listener which should no longer be notified
 * 
 * @exception IllegalArgumentException
 *                <ul>
 *                <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 *                </ul>
 * @exception SWTException
 *                <ul>
 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
 *                disposed</li>
 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
 *                thread that created the receiver</li>
 *                </ul>
 * 
 * @see ArmListener
 * @see #addArmListener
 */
public void removeArmListener(ArmListener listener) {
	checkWidget();
	if (listener == null)
		error(SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null)
		return;
	eventTable.unhook(SWT.Arm, listener);
}