DragControlTest.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.SWTEventHelper.trigger;
import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.inOrder;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verifyNoMoreInteractions;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.mockito.InOrder;

import com.codeaffine.eclipse.swt.test.util.DisplayHelper;
import com.codeaffine.eclipse.swt.widget.scrollbar.DragControl.DragAction;

public class DragControlTest {

  private static final int WIDTH = 100;
  private static final int HEIGHT = 200;

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

  private DragControl clickControl;
  private DragAction dragAction;
  private Shell parent;

  @Before
  public void setUp() {
    parent = displayHelper.createShell( SWT.SHELL_TRIM );
    dragAction = mock( DragAction.class );
    clickControl = new DragControl( parent, dragAction, FlatScrollBar.DEFAULT_MAX_EXPANSION );
  }

  @Test
  public void dragDetection() {
    trigger( SWT.MouseDown ).at( 1, 1 ).on( getClickControl() );
    trigger( SWT.MouseMove ).at( 10, 10 ).withStateMask( SWT.BUTTON1 ).on( getClickControl() );

    InOrder order = inOrder( dragAction );
    order.verify( dragAction ).start();
    order.verify( dragAction ).run( 1, 1, 10, 10 );
    order.verifyNoMoreInteractions();
  }

  @Test
  public void dragDetectionIfMouseDownNotOnControl() {
    trigger( SWT.MouseDown ).at( 1, 1 ).on( parent );
    trigger( SWT.MouseMove ).at( 10, 10 ).withStateMask( SWT.BUTTON1 ).on( getClickControl() );

    verifyNoMoreInteractions( dragAction );
  }

  @Test
  public void dragDetectionWithConsecutiveEvents() {
    trigger( SWT.MouseDown ).at( 1, 1 ).on( getClickControl() );
    trigger( SWT.MouseMove ).at( 10, 10 ).withStateMask( SWT.BUTTON1 ).on( getClickControl() );
    trigger( SWT.MouseMove ).at( 20, 20 ).withStateMask( SWT.BUTTON1 ).on( getClickControl() );

    InOrder order = inOrder( dragAction );
    order.verify( dragAction ).start();
    order.verify( dragAction ).run( 1, 1, 10, 10 );
    order.verify( dragAction ).run( 1, 1, 20, 20 );
    order.verifyNoMoreInteractions();
  }

  @Test
  public void dragDetectionAfterMouseUp() {
    trigger( SWT.MouseDown ).at( 1, 1 ).on( getClickControl() );
    trigger( SWT.MouseMove ).at( 10, 10 ).withStateMask( SWT.BUTTON1 ).on( getClickControl() );
    trigger( SWT.MouseUp ).at( 10, 10 ).on( getClickControl() );
    trigger( SWT.MouseMove ).at( 20, 20 ).withStateMask( SWT.BUTTON1 ).on( getClickControl() );

    InOrder order = inOrder( dragAction );
    order.verify( dragAction ).start();
    order.verify( dragAction ).run( 1, 1, 10, 10 );
    order.verify( dragAction ).end();
    order.verifyNoMoreInteractions();
  }
  @Test
  public void mouseUp() {
    trigger( SWT.MouseUp ).at( 10, 10 ).on( getClickControl() );

    verifyNoMoreInteractions( dragAction );
  }

  @Test
  public void controlResized() {
    getClickControl().setSize( WIDTH, HEIGHT );

    Image actual = getClickControl().getImage();

    assertThat( actual.getBounds() ).isEqualTo( expectedImageBounds( WIDTH, HEIGHT ) );
  }

  @Test
  public void getControl() {
    Control control = clickControl.getControl();

    assertThat( control.getLayoutData() ).isNull();
  }

  @Test
  public void setForeground() {
    clickControl.getControl().setSize( 20, 20 );

    ImageData first = renderImageWithForeground( displayHelper.getDisplay().getSystemColor( SWT.COLOR_RED ) );
    ImageData second = renderImageWithForeground( displayHelper.getDisplay().getSystemColor( SWT.COLOR_CYAN ) );

    assertThat( first.data ).isNotEqualTo( second.data );
  }

  @Test
  public void getForeground() {
    Color expected = displayHelper.getDisplay().getSystemColor( SWT.COLOR_BLACK );

    clickControl.setForeground( expected );
    Color actual = clickControl.getForeground();

    assertThat( actual ).isEqualTo( expected );
  }

  @Test
  public void setBackground() {
    clickControl.getControl().setSize( 20, 20 );

    ImageData first = renderImageWithBackground( displayHelper.getDisplay().getSystemColor( SWT.COLOR_RED ) );
    ImageData second = renderImageWithBackground( displayHelper.getDisplay().getSystemColor( SWT.COLOR_CYAN ) );

    assertThat( first.data ).isNotEqualTo( second.data );
  }

  @Test
  public void getBackground() {
    Color expected = displayHelper.getDisplay().getSystemColor( SWT.COLOR_BLACK );

    clickControl.setBackground( expected );
    Color actual = clickControl.getBackground();

    assertThat( actual ).isEqualTo( expected );
  }

  private ImageData renderImageWithForeground( Color color ) {
    clickControl.setForeground( color );
    return renderImage();
  }

  private ImageData renderImageWithBackground( Color color ) {
    clickControl.setBackground( color );
    return renderImage();
  }

  private ImageData renderImage() {
    clickControl.controlResized( null );
    return clickControl.getControl().getImage().getImageData();
  }

  private Label getClickControl() {
    return clickControl.getControl();
  }

  private static Rectangle expectedImageBounds( int width, int height ) {
    return new Rectangle( 0, 0, width, height );
  }
}