MouseTrackerTest.java

/**
 * Copyright (c) 2014 - 2017 Frank Appel
 * 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
 *
 * Contributors:
 *   Frank Appel - initial API and implementation
 */
package com.codeaffine.eclipse.swt.widget.scrollbar;

import static com.codeaffine.eclipse.swt.test.util.DisplayHelper.flushPendingEvents;
import static com.codeaffine.eclipse.swt.test.util.SWTEventHelper.trigger;
import static java.lang.Thread.sleep;
import static org.assertj.core.api.Assertions.assertThat;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Shell;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;

import com.codeaffine.eclipse.swt.test.util.DisplayHelper;

public class MouseTrackerTest {

  private static final int MAX_EXPANSION = Direction.CLEARANCE;
  private static final Rectangle BOUNDS = new Rectangle( 10, 20, 30, FlatScrollBar.BAR_BREADTH );
  private static final Rectangle BOUNDS_ON_MOUSE_OVER = new Rectangle( 10, 16, 30, 10 );

  @Rule
  public final DisplayHelper displayHelper = new DisplayHelper();

  private MouseTracker mouseTracker;
  private FlatScrollBar scrollBar;

  @Before
  public void setUp() {
    Shell shell = displayHelper.createShell();
    scrollBar = new FlatScrollBar( shell, SWT.HORIZONTAL );
    scrollBar.setBounds( BOUNDS );
    mouseTracker = new MouseTracker( scrollBar, MAX_EXPANSION );
  }

  @Test
  public void mouseEnter() {
    mouseTracker.mouseEnter( null );
    Rectangle actual = scrollBar.getBounds();

    assertThat( actual ).isEqualTo( BOUNDS_ON_MOUSE_OVER );
  }

  @Test
  public void mouseEnterAfterDisposalOfControl() {
    trigger( SWT.Dispose ).on( scrollBar );

    mouseTracker.mouseEnter( null );
    Rectangle actual = scrollBar.getBounds();

    assertThat( actual ).isEqualTo( BOUNDS );
  }

  @Test
  public void mouseEnterTwice() {
    mouseTracker.mouseEnter( null );
    mouseTracker.mouseExit( null );
    mouseTracker.mouseEnter( null );
    Rectangle actual = scrollBar.getBounds();

    assertThat( actual ).isEqualTo( BOUNDS_ON_MOUSE_OVER );
  }

  @Test
  public void mouseExit() throws InterruptedException {
    mouseTracker.mouseEnter( null );

    mouseTracker.mouseExit( null );
    sleep( MouseTracker.DELAY + 100 );
    flushPendingEvents();
    Rectangle actual = scrollBar.getBounds();

    assertThat( actual ).isEqualTo( BOUNDS );
  }

  @Test
  public void mouseExitAfterDisposalOfControl() throws InterruptedException {
    mouseTracker.mouseEnter( null );
    trigger( SWT.Dispose ).on( scrollBar );

    mouseTracker.mouseExit( null );
    sleep( MouseTracker.DELAY + 100 );
    flushPendingEvents();
    Rectangle actual = scrollBar.getBounds();

    assertThat( actual ).isNotEqualTo( BOUNDS );
  }

  @Test
  public void mouseExitAfterBoundsHasBeenChangedExternally() throws InterruptedException {
    Rectangle expected = new Rectangle( 10, 20, 30, 40 );
    mouseTracker.mouseEnter( null );
    scrollBar.setBounds( expected );

    mouseTracker.mouseExit( null );
    sleep( MouseTracker.DELAY + 100 );
    flushPendingEvents();
    Rectangle actual = scrollBar.getBounds();

    assertThat( actual ).isEqualTo( expected );
  }

  @Test
  public void runAfterEnterAndExit() {
    mouseTracker.mouseEnter( null );
    mouseTracker.mouseExit( null );

    mouseTracker.run();
    Rectangle actual = scrollBar.getBounds();

    assertThat( actual ).isEqualTo( BOUNDS );
  }

  @Test
  public void runAfterMouseEnter() {
    mouseTracker.mouseEnter( null );

    mouseTracker.run();
    Rectangle actual = scrollBar.getBounds();

    assertThat( actual ).isEqualTo( BOUNDS_ON_MOUSE_OVER );
  }

  @Test
  public void runAfterDisposeOfControl() throws InterruptedException {
    mouseTracker.mouseEnter( null );
    mouseTracker.mouseExit( null );
    trigger( SWT.Dispose ).on( scrollBar );

    sleep( MouseTracker.DELAY + 100 );
    flushPendingEvents();
    Rectangle actual = scrollBar.getBounds();
    assertThat( actual ).isNotEqualTo( BOUNDS );
  }
}