org.eclipse.swt.snippets.Snippet125.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet125.java

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/*******************************************************************************
 * Copyright (c) 2000, 2016 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;

/*
 * Tool Tips example snippet: create fake tool tips for items in a table
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet125 {

    public static void main(String[] args) {
        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setText("Snippet 125");
        shell.setLayout(new FillLayout());
        final Table table = new Table(shell, SWT.BORDER);
        for (int i = 0; i < 20; i++) {
            TableItem item = new TableItem(table, SWT.NONE);
            item.setText("item " + i);
        }
        // Disable native tooltip
        table.setToolTipText("");

        // Implement a "fake" tooltip
        final Listener labelListener = event -> {
            Label label = (Label) event.widget;
            Shell shell1 = label.getShell();
            switch (event.type) {
            case SWT.MouseDown:
                Event e = new Event();
                e.item = (TableItem) label.getData("_TABLEITEM");
                // Assuming table is single select, set the selection as if
                // the mouse down event went through to the table
                table.setSelection(new TableItem[] { (TableItem) e.item });
                table.notifyListeners(SWT.Selection, e);
                shell1.dispose();
                table.setFocus();
                break;
            case SWT.MouseExit:
                shell1.dispose();
                break;
            }
        };

        Listener tableListener = new Listener() {
            Shell tip = null;
            Label label = null;

            @Override
            public void handleEvent(Event event) {
                switch (event.type) {
                case SWT.Dispose:
                case SWT.KeyDown:
                case SWT.MouseMove: {
                    if (tip == null)
                        break;
                    tip.dispose();
                    tip = null;
                    label = null;
                    break;
                }
                case SWT.MouseHover: {
                    TableItem item = table.getItem(new Point(event.x, event.y));
                    if (item != null) {
                        if (tip != null && !tip.isDisposed())
                            tip.dispose();
                        tip = new Shell(shell, SWT.ON_TOP | SWT.NO_FOCUS | SWT.TOOL);
                        tip.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
                        FillLayout layout = new FillLayout();
                        layout.marginWidth = 2;
                        tip.setLayout(layout);
                        label = new Label(tip, SWT.NONE);
                        label.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
                        label.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
                        label.setData("_TABLEITEM", item);
                        label.setText(item.getText());
                        label.addListener(SWT.MouseExit, labelListener);
                        label.addListener(SWT.MouseDown, labelListener);
                        Point size = tip.computeSize(SWT.DEFAULT, SWT.DEFAULT);
                        Rectangle rect = item.getBounds(0);
                        Point pt = table.toDisplay(rect.x, rect.y);
                        tip.setBounds(pt.x, pt.y, size.x, size.y);
                        tip.setVisible(true);
                    }
                }
                }
            }
        };
        table.addListener(SWT.Dispose, tableListener);
        table.addListener(SWT.KeyDown, tableListener);
        table.addListener(SWT.MouseMove, tableListener);
        table.addListener(SWT.MouseHover, tableListener);
        shell.pack();
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}