org.dawnsci.slicing.component.Hinter.java Source code

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Here is the source code for org.dawnsci.slicing.component.Hinter.java

Source

/*
 * Copyright (c) 2012 Diamond Light Source Ltd.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.dawnsci.slicing.component;

import org.dawnsci.slicing.Activator;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.window.DefaultToolTip;
import org.eclipse.jface.window.ToolTip;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;

class Hinter {

    public static void showHint(CellEditor cellEd, final String hint) {

        if (!Activator.getDefault().getPreferenceStore().getBoolean(SliceConstants.SHOW_HINTS))
            return;

        final Control control = cellEd.getControl();
        control.getDisplay().asyncExec(new Runnable() {
            public void run() {

                final DefaultToolTip tooltip = new DefaultToolTip(control, ToolTip.NO_RECREATE, true);
                tooltip.setText(hint);
                tooltip.setHideOnMouseDown(true);
                tooltip.setHideDelay(20000);
                tooltip.setRespectDisplayBounds(true);

                Listener listener = new Listener() {

                    @Override
                    public void handleEvent(Event event) {
                        if (!control.isDisposed()) {
                            tooltip.hide();
                        }
                        control.removeListener(SWT.FocusOut, this);
                        control.removeListener(SWT.Dispose, this);
                    }
                };
                control.addListener(SWT.Dispose, listener);
                control.addListener(SWT.FocusOut, listener);

                final GC gc = new GC(control);
                final Point size = gc.textExtent(hint);
                tooltip.show(new Point(-size.x - 15, 0));

            }
        });

    }
}