| /******************************************************************************* |
| * Copyright (c) 2020 Syntevo 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: |
| * Syntevo - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.tests.win32.snippets; |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.custom.StyledText; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.layout.*; |
| import org.eclipse.swt.widgets.*; |
| |
| public class Bug565613_ScrollbarThumbJumps { |
| public static void main(String[] args) { |
| final Display display = new Display(); |
| final Shell shell = new Shell(display); |
| GridLayout layout = new GridLayout(1, true); |
| layout.horizontalSpacing = 10; |
| shell.setLayout(layout); |
| |
| Label hint = new Label(shell, 0); |
| hint.setText( |
| "1. Drag scrollbar thumb with you mouse\n" + |
| "2. The problem is that thumb \"jumps\" each time scrollbar reaches new value" |
| ); |
| |
| { |
| final Composite drawArea = new Composite(shell, SWT.BORDER | SWT.V_SCROLL); |
| drawArea.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); |
| final ScrollBar scrollBarV = drawArea.getVerticalBar(); |
| scrollBarV.setValues(10, 0, 20, 1, 1, 10); |
| |
| drawArea.addListener(SWT.Paint, event -> { |
| int scrollValueV = scrollBarV.getSelection(); |
| final Point size = drawArea.getSize(); |
| final int rowHeight = event.gc.getFontMetrics().getHeight(); |
| |
| int x = 0; |
| int y = 0; |
| while (y < size.y) { |
| event.gc.drawString(Integer.toString(scrollValueV++), x, y); |
| y += rowHeight; |
| } |
| }); |
| |
| scrollBarV.addListener(SWT.Selection, event -> drawArea.redraw()); |
| } |
| |
| shell.setSize(500, 300); |
| shell.open(); |
| |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch()) { |
| display.sleep(); |
| } |
| } |
| |
| display.dispose(); |
| } |
| } |