| /******************************************************************************* |
| * 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.graphics.*; |
| import org.eclipse.swt.internal.win32.OS; |
| import org.eclipse.swt.layout.*; |
| import org.eclipse.swt.widgets.*; |
| |
| import java.lang.reflect.*; |
| |
| public class Bug565426_SmoothScrolling { |
| static void simulateScroll(Scrollable control, boolean vertical, int wheelDelta) { |
| long wParam = wheelDelta << 16; |
| |
| if (vertical) |
| OS.SendMessage(control.handle, OS.WM_MOUSEWHEEL, wParam, 0); |
| else |
| OS.SendMessage(control.handle, OS.WM_MOUSEHWHEEL, wParam, 0); |
| } |
| |
| public static void main(String[] args) { |
| final Display display = new Display(); |
| |
| final Shell shell = new Shell(display); |
| shell.setLayout(new GridLayout(1, true)); |
| |
| final Label hint = new Label(shell, SWT.WRAP); |
| hint.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL)); |
| hint.setText( |
| "Problem: when you scroll the control below slowly, old SWT will not scroll at all. " + |
| "This only happens when mouse/touchpad supports smooth scrolling. " + |
| "Also see output in console." + |
| "\n\n" + |
| "If you don't have such a device, use buttons below to simulate it. " + |
| "After the patch, you should see a change every 2 clicks, because " + |
| "(1) one scroll line is 120 points " + |
| "(2) Windows settings use 3x wheel speed by default, see " + |
| "'Control Panel | Mouse | Wheel'" + |
| "\n\n" + |
| "Note that SWT Scrollable doesn't scroll on horizontal mouse wheel yet. " + |
| "You will still see console output for it. " + |
| "Some touchpads will directly scroll control instead of sending horz mouse wheel events, " + |
| "which would appear as if Scrollable actually scrolls on horz wheel." |
| ); |
| |
| final Composite drawArea = new Composite(shell, SWT.DOUBLE_BUFFERED | SWT.V_SCROLL | SWT.H_SCROLL); |
| drawArea.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL | GridData.FILL_BOTH)); |
| final ScrollBar scrollBarV = drawArea.getVerticalBar(); |
| final ScrollBar scrollBarH = drawArea.getHorizontalBar(); |
| scrollBarV.setValues(10000, 0, 20000, 1, 1, 10); |
| scrollBarH.setValues(0, 0, 100, 1, 1, 10); |
| |
| drawArea.addListener(SWT.Paint, event -> { |
| int scrollValueV = scrollBarV.getSelection(); |
| int scrollValueH = scrollBarH.getSelection(); |
| final Point size = drawArea.getSize(); |
| final int rowHeight = event.gc.getFontMetrics().getHeight(); |
| |
| int x = (size.x / 2) - (size.x * scrollValueH / 100); |
| int y = 0; |
| while (y < size.y) { |
| event.gc.drawString(Integer.toString(scrollValueV++), x, y); |
| y += rowHeight; |
| } |
| }); |
| |
| scrollBarH.addListener(SWT.Selection, event -> drawArea.redraw()); |
| scrollBarV.addListener(SWT.Selection, event -> drawArea.redraw()); |
| |
| drawArea.addListener(SWT.MouseVerticalWheel, event -> { |
| System.out.format( |
| "SWT.MouseVerticalWheel: %+d%n", |
| event.count |
| ); |
| }); |
| |
| drawArea.addListener(SWT.MouseHorizontalWheel, event -> { |
| System.out.format( |
| "SWT.MouseHorizontalWheel: %+d%n", |
| event.count |
| ); |
| }); |
| |
| final Composite buttonsComposite = new Composite(shell, 0); |
| buttonsComposite.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL)); |
| buttonsComposite.setLayout(new RowLayout()); |
| { |
| Button button; |
| |
| button = new Button(buttonsComposite, SWT.PUSH); |
| button.setText("Horz -20 points"); |
| button.addListener(SWT.Selection, e -> simulateScroll(drawArea, false, -20)); |
| |
| button = new Button(buttonsComposite, SWT.PUSH); |
| button.setText("Horz +20 points"); |
| button.addListener(SWT.Selection, e -> simulateScroll(drawArea, false, +20)); |
| |
| button = new Button(buttonsComposite, SWT.PUSH); |
| button.setText("Vert -20 points"); |
| button.addListener(SWT.Selection, e -> simulateScroll(drawArea, true, -20)); |
| |
| button = new Button(buttonsComposite, SWT.PUSH); |
| button.setText("Vert +20 points"); |
| button.addListener(SWT.Selection, e -> simulateScroll(drawArea, true, +20)); |
| } |
| |
| shell.setSize(600, 500); |
| shell.open(); |
| |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch()) { |
| display.sleep(); |
| } |
| } |
| |
| display.dispose(); |
| } |
| } |