ui/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/views/imagebrowser/ImageBrowserView.java - pde/eclipse.pde.ui - Git at Google

 /*******************************************************************************
  *  Copyright (c) 2012, 2016 Christian Pontesegger and others.
  *  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:
  *     Christian Pontesegger - initial API and implementation
  *     IBM Corporation - ongoing enhancements
  *     Alena Laskavaia - Bug 481613 pagination controls
  *******************************************************************************/

 package org.eclipse.pde.internal.ui.views.imagebrowser;

 import static org.eclipse.swt.events.SelectionListener.widgetSelectedAdapter;

 import java.util.*;
 import java.util.List;
 import org.eclipse.jface.layout.GridDataFactory;
 import org.eclipse.jface.layout.RowLayoutFactory;
 import org.eclipse.jface.viewers.*;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.pde.internal.ui.*;
 import org.eclipse.pde.internal.ui.views.imagebrowser.filter.*;
 import org.eclipse.pde.internal.ui.views.imagebrowser.filter.IFilter;
 import org.eclipse.pde.internal.ui.views.imagebrowser.repositories.*;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.ScrolledComposite;
 import org.eclipse.swt.events.*;
 import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.layout.*;
 import org.eclipse.swt.widgets.*;
 import org.eclipse.ui.ISourceProvider;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.forms.events.HyperlinkAdapter;
 import org.eclipse.ui.forms.events.HyperlinkEvent;
 import org.eclipse.ui.forms.widgets.Hyperlink;
 import org.eclipse.ui.part.ViewPart;
 import org.eclipse.ui.services.ISourceProviderService;

 /**
  * Provides the PDE Image browser view which displays all icons and images from plug-ins.  The plug-ins
  * can be loaded from the target platform, the workspace or the current install.
  */
 public class ImageBrowserView extends ViewPart implements IImageTarget {

 	private final UpdateUI mUIJob = new UpdateUI();

 	private final List<IFilter> mFilters = new ArrayList<>();
 	private final IFilter disabledIcons;
 	private final IFilter enabledIcons;
 	private final IFilter wizard;

 	private ScrolledComposite scrolledComposite;
 	private Composite imageComposite;
 	private ComboViewer sourceCombo;
 	private int maxImages; // Number of images per page
 	private int page; // Zero based page number
 	private int imageIndex; // Zero base index of currently available image
 	private Label lblPlugin;
 	private Label lblPath;
 	private Label lblWidth;
 	private Label lblHeight;
 	private Text txtReference;
 	private Spinner spinMaxImages;

 	private List<Image> displayedImages = new ArrayList<>();

 	private AbstractRepository repository;

 	private Text txtFilter;
 	private IFilter textPatternFilter;
 	private PageNavigationControl pageNavigationControl;

 	public ImageBrowserView() {
 		// create default filters
 		final IFilter iconSize = new SizeFilter(16, SizeFilter.TYPE_EXACT, 16, SizeFilter.TYPE_EXACT);
 		final IFilter disabled1 = new PatternFilter(".*/obj16/\\w+dis(_obj)?\\W.+"); //$NON-NLS-1$
 		final IFilter disabled2 = new PatternFilter(".*/d(?!ialogs)(?!ecorations)(?!nd)(?!evguide)\\w+/.+"); //$NON-NLS-1$
 		final IFilter disabled = new OrFilter(new IFilter[] {disabled1, disabled2});
 		disabledIcons = new AndFilter(new IFilter[] {iconSize, disabled});

 		final IFilter enabled = new NotFilter(disabled);
 		enabledIcons = new AndFilter(new IFilter[] {iconSize, enabled});

 		final IFilter wizardSize = new SizeFilter(75, SizeFilter.TYPE_EXACT, 66, SizeFilter.TYPE_EXACT);
 		final IFilter wizard1 = new PatternFilter(".*/wizban/.+"); //$NON-NLS-1$
 		final IFilter wizard2 = new PatternFilter(".+_wiz\\.\\w+"); //$NON-NLS-1$
 		final IFilter wizardName = new OrFilter(new IFilter[] {wizard1, wizard2});
 		wizard = new AndFilter(new IFilter[] {wizardSize, wizardName});

 		mFilters.add(enabledIcons);
 		textPatternFilter = new StringFilter("*"); //$NON-NLS-1$
 		mFilters.add(textPatternFilter);
 	}

 	@Override
 	public void createPartControl(final Composite parent) {
 		final Composite composite = SWTFactory.createComposite(parent, 1, 1, GridData.FILL_BOTH, 0, 0);
 		PlatformUI.getWorkbench().getHelpSystem().setHelp(composite, IHelpContextIds.IMAGE_BROWSER_VIEW);
 		composite.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
 		Composite topComp = new Composite(composite, SWT.NONE);
 		RowLayout layout = new RowLayout();
 		// need to center vertically, otherwise its looks misaligned
 		layout.center = true;
 		topComp.setLayout(layout);
 		topComp.setFont(parent.getFont());
 		topComp.setBackground(composite.getBackground());
 		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
 		topComp.setLayoutData(gd);

 		Composite sourceComp = SWTFactory.createComposite(topComp, 2, 1, SWT.NONE, 0, 0);
 		sourceComp.setLayoutData(new RowData());
 		SWTFactory.createLabel(sourceComp, PDEUIMessages.ImageBrowserView_Source, 1);
 		sourceCombo = new ComboViewer(SWTFactory.createCombo(sourceComp, SWT.READ_ONLY, 1, null));
 		sourceCombo.setContentProvider(new ArrayContentProvider());
 		sourceCombo.addSelectionChangedListener(new ISelectionChangedListener() {
 			@Override
 			public void selectionChanged(SelectionChangedEvent event) {
 				page = 0; // reset to 1st page
 				scanImages();
 			}
 		});

 		ArrayList<Object> sourceComboInput = new ArrayList<>();
 		sourceComboInput.add(new TargetPlatformRepository(this, true));
 		sourceComboInput.add(new TargetPlatformRepository(this, false));
 		sourceComboInput.add(new WorkspaceRepository(this));
 		sourceCombo.setInput(sourceComboInput);


 		// image type
 		Composite typeComp = SWTFactory.createComposite(topComp, 2, 1, SWT.NONE, 0, 0);
 		typeComp.setLayoutData(new RowData());
 		SWTFactory.createLabel(typeComp, PDEUIMessages.ImageBrowserView_Show, 1);
 		Combo typeCombo = SWTFactory.createCombo(typeComp, SWT.READ_ONLY, 1,
 				new String[] { PDEUIMessages.ImageBrowserView_FilterIcons,
 						PDEUIMessages.ImageBrowserView_FilterDisabled, PDEUIMessages.ImageBrowserView_FilterWizards,
 						PDEUIMessages.ImageBrowserView_FilterAllImages });
 		typeCombo.addSelectionListener(widgetSelectedAdapter(e -> {
 			mFilters.clear();
 			mFilters.add(textPatternFilter);
 			Combo source = (Combo) e.getSource();
 			switch (source.getSelectionIndex()) {
 				case 0 :
 					mFilters.add(enabledIcons);
 					break;
 				case 1 :
 					mFilters.add(disabledIcons);
 					break;
 				case 2 :
 					mFilters.add(wizard);
 					break;
 				case 3 :
 				default :
 			}
 			page = 0; // reset to 1st page
 			scanImages();
 		}));

 		// max images
 		Composite maxComp = SWTFactory.createComposite(topComp, 2, 1, SWT.NONE, 0, 0);
 		maxComp.setLayoutData(new RowData());
 		SWTFactory.createLabel(maxComp, PDEUIMessages.ImageBrowserView_MaxImages, 1);
 		spinMaxImages = new Spinner(maxComp, SWT.BORDER);
 		spinMaxImages.setMaximum(999);
 		spinMaxImages.setMinimum(1);
 		spinMaxImages.setSelection(250);
 		spinMaxImages.setLayoutData(GridDataFactory.fillDefaults().create());
 		spinMaxImages.addModifyListener(new ModifyListener() {
 			@Override
 			public void modifyText(ModifyEvent e) {
 				page = 0; // reset to 1st page
 				scanImages();
 			}
 		});

 		Composite filterComp = SWTFactory.createComposite(topComp, 2, 1, SWT.NONE, 0, 0);
 		filterComp.setLayoutData(new RowData());
 		SWTFactory.createLabel(filterComp, PDEUIMessages.ImageBrowserView_FilterText, 1)
 				.setToolTipText(PDEUIMessages.ImageBrowserView_FilterTooltip);
 		txtFilter = SWTFactory.createText(filterComp, SWT.BORDER | SWT.SEARCH, 1);
 		((GridData) txtFilter.getLayoutData()).widthHint = 200;
 		txtFilter.setToolTipText(PDEUIMessages.ImageBrowserView_FilterTooltip);
 		txtFilter.addModifyListener(new ModifyListener() {
 			@Override
 			public void modifyText(ModifyEvent e) {
 				String pattern = txtFilter.getText();
 				pattern = pattern.trim();
 				// we match begging and end, user does not have to type *debug*
 				String STAR = "*"; //$NON-NLS-1$
 				if (!pattern.startsWith(STAR)) {
 					pattern = STAR + pattern;
 				}
 				if (!pattern.endsWith(STAR)) {
 					pattern += STAR;
 				}
 				mFilters.remove(textPatternFilter);
 				textPatternFilter = new StringFilter(pattern);
 				mFilters.add(textPatternFilter);
 				page = 0; // reset to 1st page
 				scanImages();
 			}
 		});

 		scrolledComposite = new ScrolledComposite(composite, SWT.BORDER | SWT.V_SCROLL);
 		scrolledComposite.setBackground(scrolledComposite.getParent().getBackground());
 		scrolledComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 		scrolledComposite.setExpandHorizontal(true);
 		scrolledComposite.setExpandVertical(true);

 		scrolledComposite.addControlListener(new ControlAdapter() {
 			@Override
 			public void controlResized(final ControlEvent e) {
 				Rectangle r = scrolledComposite.getClientArea();
 				scrolledComposite.setMinSize(imageComposite.computeSize(r.width, SWT.DEFAULT));
 			}
 		});
 		imageComposite = SWTFactory.createComposite(scrolledComposite, 1, 1, GridData.FILL_BOTH, 0, 0);
 		((GridLayout) imageComposite.getLayout()).verticalSpacing = 0;
 		imageComposite.setBackground(imageComposite.getParent().getBackground());
 		scrolledComposite.setContent(imageComposite);
 		scrolledComposite.setMinSize(imageComposite.computeSize(SWT.DEFAULT, SWT.DEFAULT));

 		Composite infoGroup = SWTFactory.createComposite(composite, 4, 1, GridData.FILL_HORIZONTAL, 0, 0);
 		((GridLayout) infoGroup.getLayout()).verticalSpacing = 0;

 		SWTFactory.createLabel(infoGroup, PDEUIMessages.ImageBrowserView_Path, 1);
 		lblPath = new Label(infoGroup, SWT.NONE);
 		lblPath.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));

 		SWTFactory.createLabel(infoGroup, PDEUIMessages.ImageBrowserView_Width, 1);
 		lblWidth = new Label(infoGroup, SWT.NONE);
 		final GridData gd_lblWidth = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
 		gd_lblWidth.widthHint = 50;
 		lblWidth.setLayoutData(gd_lblWidth);

 		SWTFactory.createLabel(infoGroup, PDEUIMessages.ImageBrowserView_Plugin, 1);
 		lblPlugin = new Label(infoGroup, SWT.NONE);
 		lblPlugin.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));

 		SWTFactory.createLabel(infoGroup, PDEUIMessages.ImageBrowserView_Height, 1);
 		lblHeight = new Label(infoGroup, SWT.NONE);
 		final GridData gd_lblHeight = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
 		gd_lblHeight.widthHint = 50;
 		lblHeight.setLayoutData(gd_lblHeight);

 		SWTFactory.createLabel(infoGroup, PDEUIMessages.ImageBrowserView_Reference, 1);
 		txtReference = new Text(infoGroup, SWT.BORDER | SWT.READ_ONLY);
 		txtReference.setBackground(txtReference.getParent().getBackground());
 		txtReference.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 3, 1));

 		// set original selection
 		sourceCombo.setSelection(new StructuredSelection(sourceComboInput.get(0)), true);
 	}

 	/*-
 	 * Control for page navigation, looks like this
 	 *
 	 *
 	 *                           Previous Page 1 2 3 4 5 Next Page
 	 *
 	 */
 	class PageNavigationControl extends Composite {
 		public PageNavigationControl(Composite parent, int style) {
 			super(parent, style);
 			setBackground(parent.getBackground());
 			RowLayoutFactory.fillDefaults().extendedMargins(0, 0, 50, 5).applyTo(this);
 			GridDataFactory.fillDefaults().align(SWT.CENTER, SWT.END).grab(true, true).applyTo(this);
 			Color hyperlinkColor = getDisplay().getSystemColor(SWT.COLOR_LINK_FOREGROUND);
 			// Previous Page link
 			Hyperlink prev = new Hyperlink(this, SWT.NONE);
 			prev.setText(PDEUIMessages.ImageBrowserView_PrevPage);
 			prev.setForeground(hyperlinkColor);
 			prev.addHyperlinkListener(new HyperlinkAdapter() {
 				@Override
 				public void linkActivated(HyperlinkEvent e) {
 					if (page > 0)
 						page--;
 					scanImages();
 				}
 			});
 			prev.setBackground(getBackground());
 			if (page == 0)
 				prev.setEnabled(false);
 			// Links to individual pages
 			int currentlyAvailable = imageIndex + 1;
 			int curPage = page + 1;
 			int maxPage = curPage;
 			boolean lastPage = currentlyAvailable <= curPage * maxImages;
 			if (!lastPage)
 				maxPage = Math.max(curPage + 1, 5);
 			// we only show link for 5 last pages
 			int start = Math.max(maxPage - 5 + 1, 1);
 			for (int i = start; i <= maxPage; i++) {
 				Hyperlink pageLink = new Hyperlink(this, SWT.NONE);
 				pageLink.setText(String.valueOf(i));
 				pageLink.setBackground(pageLink.getParent().getBackground());
 				if (i != curPage) {
 					final int selectedPage = i;
 					pageLink.setForeground(hyperlinkColor);
 					pageLink.addHyperlinkListener(new HyperlinkAdapter() {
 						@Override
 						public void linkActivated(HyperlinkEvent e) {
 							page = selectedPage - 1;
 							scanImages();
 						}
 					});
 				}

 			}
 			// Next Page Link
 			Hyperlink next = new Hyperlink(this, SWT.NONE);
 			next.setText(PDEUIMessages.ImageBrowserView_NextPage);
 			next.setForeground(hyperlinkColor);
 			next.addHyperlinkListener(new HyperlinkAdapter() {
 				@Override
 				public void linkActivated(HyperlinkEvent e) {
 					page++;
 					scanImages();
 				}
 			});
 			next.setBackground(getBackground());
 			if (lastPage)
 				next.setEnabled(false);

 		}
 	}

 	@Override
 	public void setFocus() {
 		scrolledComposite.getParent().setFocus();
 	}

 	@Override
 	public synchronized void notifyImage(final ImageElement element) {
 		// make a copy of filter to avoid concurrent modification exception since UI changes mFilters list
 		ArrayList<IFilter> filters = new ArrayList<>(mFilters);
 		for (final IFilter filter : filters) {
 			if (!filter.accept(element))
 				return;
 		}
 		if (imageIndex >= page * maxImages && imageIndex < (page + 1) * maxImages)
 			mUIJob.addImage(element);
 		imageIndex++;
 	}

 	@Override
 	public boolean needsMore() {
 		// we will request at least one more image that we can currently show to
 		// adjust page controls properly
 		int requestedImages = (page + 1) * maxImages + 1;
 		int currentlyAvailable = imageIndex + 1;
 		return currentlyAvailable < requestedImages;
 	}

 	private void scanImages() {
 		if (repository != null) {
 			repository.cancel();
 		}

 		// reset UI components
 		mUIJob.reset();
 		lblPath.setText(""); //$NON-NLS-1$
 		lblPlugin.setText(""); //$NON-NLS-1$
 		lblWidth.setText(""); //$NON-NLS-1$
 		lblHeight.setText(""); //$NON-NLS-1$
 		txtReference.setText(""); //$NON-NLS-1$

 		// first dispose controls
 		for (final Control control : imageComposite.getChildren()) {
 			control.dispose();
 		}

 		// then dispose images used in controls
 		disposeImages();

 		// set maximum image counter
 		maxImages = spinMaxImages.getSelection();
 		imageIndex = 0;
 		// initialize scan job
 		IStructuredSelection ssel = sourceCombo.getStructuredSelection();
 		if (!ssel.isEmpty()) {
 			repository = (AbstractRepository) ssel.getFirstElement();
 			repository.schedule();
 		}
 	}

 	@Override
 	public void dispose() {
 		disposeImages();
 	}

 	private void disposeImages() {
 		for (Image image : displayedImages) {
 			image.dispose();
 		}
 		displayedImages.clear();
 	}

 	private class UpdateUI extends FocusAdapter implements Runnable {

 		Collection<ImageElement> mElements = new LinkedList<>();
 		String mLastPlugin = ""; //$NON-NLS-1$
 		private Composite mPluginImageContainer = null;
 		private final RowLayout mRowLayout = new RowLayout(SWT.HORIZONTAL);

 		public UpdateUI() {
 			mRowLayout.wrap = true;
 			mRowLayout.marginWidth = 0;
 			mRowLayout.marginHeight = 0;
 		}

 		public synchronized void addImage(final ImageElement element) {
 			mElements.add(element);

 			if (mElements.size() == 1)
 				Display.getDefault().asyncExec(this);
 		}

 		@Override
 		public synchronized void run() {

 			if (!mElements.isEmpty()) {
 				for (final ImageElement element : mElements) {
 					if (!mLastPlugin.equals(element.getPlugin())) {
 						// new plug-in detected
 						mLastPlugin = element.getPlugin();
 						Label label = new Label(imageComposite, SWT.NONE);
 						label.setText(mLastPlugin);
 						label.setBackground(label.getParent().getBackground());

 						if (mPluginImageContainer != null)
 							mPluginImageContainer.layout();

 						mPluginImageContainer = new Composite(imageComposite, SWT.NONE);
 						mPluginImageContainer.setLayout(mRowLayout);
 						mPluginImageContainer.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
 						mPluginImageContainer.setBackground(mPluginImageContainer.getParent().getBackground());
 					}

 					Button button = new Button(mPluginImageContainer, SWT.FLAT);
 					Image image = new Image(getViewSite().getShell().getDisplay(), element.getImageData());
 					displayedImages.add(image);
 					button.setImage(image);
 					button.setToolTipText(element.getPath());
 					button.setData(element);
 					button.addFocusListener(this);
 				}

 				mElements.clear();

 				mPluginImageContainer.layout();

 				if (pageNavigationControl!=null)
 					pageNavigationControl.dispose();
 				pageNavigationControl = new PageNavigationControl(imageComposite, SWT.NONE);
 				pageNavigationControl.setBackground(imageComposite.getBackground());

 				imageComposite.layout();

 				Rectangle r = scrolledComposite.getClientArea();
 				scrolledComposite.setMinSize(imageComposite.computeSize(r.width, SWT.DEFAULT));
 			}
 		}

 		@Override
 		public void focusGained(FocusEvent e) {
 			// Scroll the focused control into view
 			Control child = (Control) e.widget;
 			Rectangle bounds = child.getBounds();
 			// Because we store the buttons in an additional composite, need to adjust bounds
 			Rectangle pluginBounds = child.getParent().getBounds();
 			bounds.x += pluginBounds.x;
 			bounds.y += pluginBounds.y;
 			Rectangle area = scrolledComposite.getClientArea();
 			Point origin = scrolledComposite.getOrigin();
 			if (origin.x > bounds.x)
 				origin.x = Math.max(0, bounds.x);
 			if (origin.y > bounds.y)
 				origin.y = Math.max(0, bounds.y);
 			if (origin.x + area.width < bounds.x + bounds.width)
 				origin.x = Math.max(0, bounds.x + bounds.width - area.width);
 			if (origin.y + area.height < bounds.y + bounds.height)
 				origin.y = Math.max(0, bounds.y + bounds.height - area.height);
 			scrolledComposite.setOrigin(origin);

 			final Object data = e.widget.getData();
 			if (data instanceof ImageElement) {

 				lblPath.setText(((ImageElement) data).getPath());
 				lblPlugin.setText(((ImageElement) data).getFullPlugin());
 				txtReference.setText("platform:/plugin/" + ((ImageElement) data).getPlugin() + "/" + ((ImageElement) data).getPath()); //$NON-NLS-1$ //$NON-NLS-2$

 				lblWidth.setText(NLS.bind(PDEUIMessages.ImageBrowserView_Pixels, Integer.toString(((ImageElement) data).getImageData().width)));
 				lblHeight.setText(NLS.bind(PDEUIMessages.ImageBrowserView_Pixels, Integer.toString(((ImageElement) data).getImageData().height)));

 				// update source provider
 				ISourceProviderService service = PlatformUI.getWorkbench().getService(ISourceProviderService.class);
 				ISourceProvider provider = service.getSourceProvider(ActiveImageSourceProvider.ACTIVE_IMAGE);
 				if (provider instanceof ActiveImageSourceProvider)
 					((ActiveImageSourceProvider) provider).setImageData(((ImageElement) data));
 			}
 		}

 		public synchronized void reset() {
 			mLastPlugin = ""; //$NON-NLS-1$
 			mElements.clear();
 			mPluginImageContainer = null;
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2012, 2016 Christian Pontesegger and others.
	* 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:
	* Christian Pontesegger - initial API and implementation
	* IBM Corporation - ongoing enhancements
	* Alena Laskavaia - Bug 481613 pagination controls
	*******************************************************************************/

	package org.eclipse.pde.internal.ui.views.imagebrowser;

	import static org.eclipse.swt.events.SelectionListener.widgetSelectedAdapter;

	import java.util.*;
	import java.util.List;
	import org.eclipse.jface.layout.GridDataFactory;
	import org.eclipse.jface.layout.RowLayoutFactory;
	import org.eclipse.jface.viewers.*;
	import org.eclipse.osgi.util.NLS;
	import org.eclipse.pde.internal.ui.*;
	import org.eclipse.pde.internal.ui.views.imagebrowser.filter.*;
	import org.eclipse.pde.internal.ui.views.imagebrowser.filter.IFilter;
	import org.eclipse.pde.internal.ui.views.imagebrowser.repositories.*;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.ScrolledComposite;
	import org.eclipse.swt.events.*;
	import org.eclipse.swt.graphics.*;
	import org.eclipse.swt.layout.*;
	import org.eclipse.swt.widgets.*;
	import org.eclipse.ui.ISourceProvider;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.forms.events.HyperlinkAdapter;
	import org.eclipse.ui.forms.events.HyperlinkEvent;
	import org.eclipse.ui.forms.widgets.Hyperlink;
	import org.eclipse.ui.part.ViewPart;
	import org.eclipse.ui.services.ISourceProviderService;

	/**
	* Provides the PDE Image browser view which displays all icons and images from plug-ins. The plug-ins
	* can be loaded from the target platform, the workspace or the current install.
	*/
	public class ImageBrowserView extends ViewPart implements IImageTarget {

	private final UpdateUI mUIJob = new UpdateUI();

	private final List<IFilter> mFilters = new ArrayList<>();
	private final IFilter disabledIcons;
	private final IFilter enabledIcons;
	private final IFilter wizard;

	private ScrolledComposite scrolledComposite;
	private Composite imageComposite;
	private ComboViewer sourceCombo;
	private int maxImages; // Number of images per page
	private int page; // Zero based page number
	private int imageIndex; // Zero base index of currently available image
	private Label lblPlugin;
	private Label lblPath;
	private Label lblWidth;
	private Label lblHeight;
	private Text txtReference;
	private Spinner spinMaxImages;

	private List<Image> displayedImages = new ArrayList<>();

	private AbstractRepository repository;

	private Text txtFilter;
	private IFilter textPatternFilter;
	private PageNavigationControl pageNavigationControl;

	public ImageBrowserView() {
	// create default filters
	final IFilter iconSize = new SizeFilter(16, SizeFilter.TYPE_EXACT, 16, SizeFilter.TYPE_EXACT);
	final IFilter disabled1 = new PatternFilter(".*/obj16/\\w+dis(_obj)?\\W.+"); //$NON-NLS-1$
	final IFilter disabled2 = new PatternFilter(".*/d(?!ialogs)(?!ecorations)(?!nd)(?!evguide)\\w+/.+"); //$NON-NLS-1$
	final IFilter disabled = new OrFilter(new IFilter[] {disabled1, disabled2});
	disabledIcons = new AndFilter(new IFilter[] {iconSize, disabled});

	final IFilter enabled = new NotFilter(disabled);
	enabledIcons = new AndFilter(new IFilter[] {iconSize, enabled});

	final IFilter wizardSize = new SizeFilter(75, SizeFilter.TYPE_EXACT, 66, SizeFilter.TYPE_EXACT);
	final IFilter wizard1 = new PatternFilter(".*/wizban/.+"); //$NON-NLS-1$
	final IFilter wizard2 = new PatternFilter(".+_wiz\\.\\w+"); //$NON-NLS-1$
	final IFilter wizardName = new OrFilter(new IFilter[] {wizard1, wizard2});
	wizard = new AndFilter(new IFilter[] {wizardSize, wizardName});

	mFilters.add(enabledIcons);
	textPatternFilter = new StringFilter("*"); //$NON-NLS-1$
	mFilters.add(textPatternFilter);
	}

	@Override
	public void createPartControl(final Composite parent) {
	final Composite composite = SWTFactory.createComposite(parent, 1, 1, GridData.FILL_BOTH, 0, 0);
	PlatformUI.getWorkbench().getHelpSystem().setHelp(composite, IHelpContextIds.IMAGE_BROWSER_VIEW);
	composite.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
	Composite topComp = new Composite(composite, SWT.NONE);
	RowLayout layout = new RowLayout();
	// need to center vertically, otherwise its looks misaligned
	layout.center = true;
	topComp.setLayout(layout);
	topComp.setFont(parent.getFont());
	topComp.setBackground(composite.getBackground());
	GridData gd = new GridData(GridData.FILL_HORIZONTAL);
	topComp.setLayoutData(gd);

	Composite sourceComp = SWTFactory.createComposite(topComp, 2, 1, SWT.NONE, 0, 0);
	sourceComp.setLayoutData(new RowData());
	SWTFactory.createLabel(sourceComp, PDEUIMessages.ImageBrowserView_Source, 1);
	sourceCombo = new ComboViewer(SWTFactory.createCombo(sourceComp, SWT.READ_ONLY, 1, null));
	sourceCombo.setContentProvider(new ArrayContentProvider());
	sourceCombo.addSelectionChangedListener(new ISelectionChangedListener() {
	@Override
	public void selectionChanged(SelectionChangedEvent event) {
	page = 0; // reset to 1st page
	scanImages();
	}
	});

	ArrayList<Object> sourceComboInput = new ArrayList<>();
	sourceComboInput.add(new TargetPlatformRepository(this, true));
	sourceComboInput.add(new TargetPlatformRepository(this, false));
	sourceComboInput.add(new WorkspaceRepository(this));
	sourceCombo.setInput(sourceComboInput);



	// image type
	Composite typeComp = SWTFactory.createComposite(topComp, 2, 1, SWT.NONE, 0, 0);
	typeComp.setLayoutData(new RowData());
	SWTFactory.createLabel(typeComp, PDEUIMessages.ImageBrowserView_Show, 1);
	Combo typeCombo = SWTFactory.createCombo(typeComp, SWT.READ_ONLY, 1,
	new String[] { PDEUIMessages.ImageBrowserView_FilterIcons,
	PDEUIMessages.ImageBrowserView_FilterDisabled, PDEUIMessages.ImageBrowserView_FilterWizards,
	PDEUIMessages.ImageBrowserView_FilterAllImages });
	typeCombo.addSelectionListener(widgetSelectedAdapter(e -> {
	mFilters.clear();
	mFilters.add(textPatternFilter);
	Combo source = (Combo) e.getSource();
	switch (source.getSelectionIndex()) {
	case 0 :
	mFilters.add(enabledIcons);
	break;
	case 1 :
	mFilters.add(disabledIcons);
	break;
	case 2 :
	mFilters.add(wizard);
	break;
	case 3 :
	default :
	}
	page = 0; // reset to 1st page
	scanImages();
	}));

	// max images
	Composite maxComp = SWTFactory.createComposite(topComp, 2, 1, SWT.NONE, 0, 0);
	maxComp.setLayoutData(new RowData());
	SWTFactory.createLabel(maxComp, PDEUIMessages.ImageBrowserView_MaxImages, 1);
	spinMaxImages = new Spinner(maxComp, SWT.BORDER);
	spinMaxImages.setMaximum(999);
	spinMaxImages.setMinimum(1);
	spinMaxImages.setSelection(250);
	spinMaxImages.setLayoutData(GridDataFactory.fillDefaults().create());
	spinMaxImages.addModifyListener(new ModifyListener() {
	@Override
	public void modifyText(ModifyEvent e) {
	page = 0; // reset to 1st page
	scanImages();
	}
	});

	Composite filterComp = SWTFactory.createComposite(topComp, 2, 1, SWT.NONE, 0, 0);
	filterComp.setLayoutData(new RowData());
	SWTFactory.createLabel(filterComp, PDEUIMessages.ImageBrowserView_FilterText, 1)
	.setToolTipText(PDEUIMessages.ImageBrowserView_FilterTooltip);
	txtFilter = SWTFactory.createText(filterComp, SWT.BORDER \| SWT.SEARCH, 1);
	((GridData) txtFilter.getLayoutData()).widthHint = 200;
	txtFilter.setToolTipText(PDEUIMessages.ImageBrowserView_FilterTooltip);
	txtFilter.addModifyListener(new ModifyListener() {
	@Override
	public void modifyText(ModifyEvent e) {
	String pattern = txtFilter.getText();
	pattern = pattern.trim();
	// we match begging and end, user does not have to type debug
	String STAR = "*"; //$NON-NLS-1$
	if (!pattern.startsWith(STAR)) {
	pattern = STAR + pattern;
	}
	if (!pattern.endsWith(STAR)) {
	pattern += STAR;
	}
	mFilters.remove(textPatternFilter);
	textPatternFilter = new StringFilter(pattern);
	mFilters.add(textPatternFilter);
	page = 0; // reset to 1st page
	scanImages();
	}
	});

	scrolledComposite = new ScrolledComposite(composite, SWT.BORDER \| SWT.V_SCROLL);
	scrolledComposite.setBackground(scrolledComposite.getParent().getBackground());
	scrolledComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
	scrolledComposite.setExpandHorizontal(true);
	scrolledComposite.setExpandVertical(true);

	scrolledComposite.addControlListener(new ControlAdapter() {
	@Override
	public void controlResized(final ControlEvent e) {
	Rectangle r = scrolledComposite.getClientArea();
	scrolledComposite.setMinSize(imageComposite.computeSize(r.width, SWT.DEFAULT));
	}
	});
	imageComposite = SWTFactory.createComposite(scrolledComposite, 1, 1, GridData.FILL_BOTH, 0, 0);
	((GridLayout) imageComposite.getLayout()).verticalSpacing = 0;
	imageComposite.setBackground(imageComposite.getParent().getBackground());
	scrolledComposite.setContent(imageComposite);
	scrolledComposite.setMinSize(imageComposite.computeSize(SWT.DEFAULT, SWT.DEFAULT));

	Composite infoGroup = SWTFactory.createComposite(composite, 4, 1, GridData.FILL_HORIZONTAL, 0, 0);
	((GridLayout) infoGroup.getLayout()).verticalSpacing = 0;

	SWTFactory.createLabel(infoGroup, PDEUIMessages.ImageBrowserView_Path, 1);
	lblPath = new Label(infoGroup, SWT.NONE);
	lblPath.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));

	SWTFactory.createLabel(infoGroup, PDEUIMessages.ImageBrowserView_Width, 1);
	lblWidth = new Label(infoGroup, SWT.NONE);
	final GridData gd_lblWidth = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
	gd_lblWidth.widthHint = 50;
	lblWidth.setLayoutData(gd_lblWidth);

	SWTFactory.createLabel(infoGroup, PDEUIMessages.ImageBrowserView_Plugin, 1);
	lblPlugin = new Label(infoGroup, SWT.NONE);
	lblPlugin.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));

	SWTFactory.createLabel(infoGroup, PDEUIMessages.ImageBrowserView_Height, 1);
	lblHeight = new Label(infoGroup, SWT.NONE);
	final GridData gd_lblHeight = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
	gd_lblHeight.widthHint = 50;
	lblHeight.setLayoutData(gd_lblHeight);

	SWTFactory.createLabel(infoGroup, PDEUIMessages.ImageBrowserView_Reference, 1);
	txtReference = new Text(infoGroup, SWT.BORDER \| SWT.READ_ONLY);
	txtReference.setBackground(txtReference.getParent().getBackground());
	txtReference.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 3, 1));

	// set original selection
	sourceCombo.setSelection(new StructuredSelection(sourceComboInput.get(0)), true);
	}

	/*-
	* Control for page navigation, looks like this
	*
	*
	* Previous Page 1 2 3 4 5 Next Page
	*
	*/
	class PageNavigationControl extends Composite {
	public PageNavigationControl(Composite parent, int style) {
	super(parent, style);
	setBackground(parent.getBackground());
	RowLayoutFactory.fillDefaults().extendedMargins(0, 0, 50, 5).applyTo(this);
	GridDataFactory.fillDefaults().align(SWT.CENTER, SWT.END).grab(true, true).applyTo(this);
	Color hyperlinkColor = getDisplay().getSystemColor(SWT.COLOR_LINK_FOREGROUND);
	// Previous Page link
	Hyperlink prev = new Hyperlink(this, SWT.NONE);
	prev.setText(PDEUIMessages.ImageBrowserView_PrevPage);
	prev.setForeground(hyperlinkColor);
	prev.addHyperlinkListener(new HyperlinkAdapter() {
	@Override
	public void linkActivated(HyperlinkEvent e) {
	if (page > 0)
	page--;
	scanImages();
	}
	});
	prev.setBackground(getBackground());
	if (page == 0)
	prev.setEnabled(false);
	// Links to individual pages
	int currentlyAvailable = imageIndex + 1;
	int curPage = page + 1;
	int maxPage = curPage;
	boolean lastPage = currentlyAvailable <= curPage * maxImages;
	if (!lastPage)
	maxPage = Math.max(curPage + 1, 5);
	// we only show link for 5 last pages
	int start = Math.max(maxPage - 5 + 1, 1);
	for (int i = start; i <= maxPage; i++) {
	Hyperlink pageLink = new Hyperlink(this, SWT.NONE);
	pageLink.setText(String.valueOf(i));
	pageLink.setBackground(pageLink.getParent().getBackground());
	if (i != curPage) {
	final int selectedPage = i;
	pageLink.setForeground(hyperlinkColor);
	pageLink.addHyperlinkListener(new HyperlinkAdapter() {
	@Override
	public void linkActivated(HyperlinkEvent e) {
	page = selectedPage - 1;
	scanImages();
	}
	});
	}

	}
	// Next Page Link
	Hyperlink next = new Hyperlink(this, SWT.NONE);
	next.setText(PDEUIMessages.ImageBrowserView_NextPage);
	next.setForeground(hyperlinkColor);
	next.addHyperlinkListener(new HyperlinkAdapter() {
	@Override
	public void linkActivated(HyperlinkEvent e) {
	page++;
	scanImages();
	}
	});
	next.setBackground(getBackground());
	if (lastPage)
	next.setEnabled(false);

	}
	}

	@Override
	public void setFocus() {
	scrolledComposite.getParent().setFocus();
	}

	@Override
	public synchronized void notifyImage(final ImageElement element) {
	// make a copy of filter to avoid concurrent modification exception since UI changes mFilters list
	ArrayList<IFilter> filters = new ArrayList<>(mFilters);
	for (final IFilter filter : filters) {
	if (!filter.accept(element))
	return;
	}
	if (imageIndex >= page * maxImages && imageIndex < (page + 1) * maxImages)
	mUIJob.addImage(element);
	imageIndex++;
	}

	@Override
	public boolean needsMore() {
	// we will request at least one more image that we can currently show to
	// adjust page controls properly
	int requestedImages = (page + 1) * maxImages + 1;
	int currentlyAvailable = imageIndex + 1;
	return currentlyAvailable < requestedImages;
	}

	private void scanImages() {
	if (repository != null) {
	repository.cancel();
	}

	// reset UI components
	mUIJob.reset();
	lblPath.setText(""); //$NON-NLS-1$
	lblPlugin.setText(""); //$NON-NLS-1$
	lblWidth.setText(""); //$NON-NLS-1$
	lblHeight.setText(""); //$NON-NLS-1$
	txtReference.setText(""); //$NON-NLS-1$

	// first dispose controls
	for (final Control control : imageComposite.getChildren()) {
	control.dispose();
	}

	// then dispose images used in controls
	disposeImages();

	// set maximum image counter
	maxImages = spinMaxImages.getSelection();
	imageIndex = 0;
	// initialize scan job
	IStructuredSelection ssel = sourceCombo.getStructuredSelection();
	if (!ssel.isEmpty()) {
	repository = (AbstractRepository) ssel.getFirstElement();
	repository.schedule();
	}
	}

	@Override
	public void dispose() {
	disposeImages();
	}

	private void disposeImages() {
	for (Image image : displayedImages) {
	image.dispose();
	}
	displayedImages.clear();
	}

	private class UpdateUI extends FocusAdapter implements Runnable {

	Collection<ImageElement> mElements = new LinkedList<>();
	String mLastPlugin = ""; //$NON-NLS-1$
	private Composite mPluginImageContainer = null;
	private final RowLayout mRowLayout = new RowLayout(SWT.HORIZONTAL);

	public UpdateUI() {
	mRowLayout.wrap = true;
	mRowLayout.marginWidth = 0;
	mRowLayout.marginHeight = 0;
	}

	public synchronized void addImage(final ImageElement element) {
	mElements.add(element);

	if (mElements.size() == 1)
	Display.getDefault().asyncExec(this);
	}

	@Override
	public synchronized void run() {

	if (!mElements.isEmpty()) {
	for (final ImageElement element : mElements) {
	if (!mLastPlugin.equals(element.getPlugin())) {
	// new plug-in detected
	mLastPlugin = element.getPlugin();
	Label label = new Label(imageComposite, SWT.NONE);
	label.setText(mLastPlugin);
	label.setBackground(label.getParent().getBackground());

	if (mPluginImageContainer != null)
	mPluginImageContainer.layout();

	mPluginImageContainer = new Composite(imageComposite, SWT.NONE);
	mPluginImageContainer.setLayout(mRowLayout);
	mPluginImageContainer.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
	mPluginImageContainer.setBackground(mPluginImageContainer.getParent().getBackground());
	}

	Button button = new Button(mPluginImageContainer, SWT.FLAT);
	Image image = new Image(getViewSite().getShell().getDisplay(), element.getImageData());
	displayedImages.add(image);
	button.setImage(image);
	button.setToolTipText(element.getPath());
	button.setData(element);
	button.addFocusListener(this);
	}

	mElements.clear();

	mPluginImageContainer.layout();

	if (pageNavigationControl!=null)
	pageNavigationControl.dispose();
	pageNavigationControl = new PageNavigationControl(imageComposite, SWT.NONE);
	pageNavigationControl.setBackground(imageComposite.getBackground());

	imageComposite.layout();

	Rectangle r = scrolledComposite.getClientArea();
	scrolledComposite.setMinSize(imageComposite.computeSize(r.width, SWT.DEFAULT));
	}
	}

	@Override
	public void focusGained(FocusEvent e) {
	// Scroll the focused control into view
	Control child = (Control) e.widget;
	Rectangle bounds = child.getBounds();
	// Because we store the buttons in an additional composite, need to adjust bounds
	Rectangle pluginBounds = child.getParent().getBounds();
	bounds.x += pluginBounds.x;
	bounds.y += pluginBounds.y;
	Rectangle area = scrolledComposite.getClientArea();
	Point origin = scrolledComposite.getOrigin();
	if (origin.x > bounds.x)
	origin.x = Math.max(0, bounds.x);
	if (origin.y > bounds.y)
	origin.y = Math.max(0, bounds.y);
	if (origin.x + area.width < bounds.x + bounds.width)
	origin.x = Math.max(0, bounds.x + bounds.width - area.width);
	if (origin.y + area.height < bounds.y + bounds.height)
	origin.y = Math.max(0, bounds.y + bounds.height - area.height);
	scrolledComposite.setOrigin(origin);

	final Object data = e.widget.getData();
	if (data instanceof ImageElement) {

	lblPath.setText(((ImageElement) data).getPath());
	lblPlugin.setText(((ImageElement) data).getFullPlugin());
	txtReference.setText("platform:/plugin/" + ((ImageElement) data).getPlugin() + "/" + ((ImageElement) data).getPath()); //$NON-NLS-1$ //$NON-NLS-2$

	lblWidth.setText(NLS.bind(PDEUIMessages.ImageBrowserView_Pixels, Integer.toString(((ImageElement) data).getImageData().width)));
	lblHeight.setText(NLS.bind(PDEUIMessages.ImageBrowserView_Pixels, Integer.toString(((ImageElement) data).getImageData().height)));

	// update source provider
	ISourceProviderService service = PlatformUI.getWorkbench().getService(ISourceProviderService.class);
	ISourceProvider provider = service.getSourceProvider(ActiveImageSourceProvider.ACTIVE_IMAGE);
	if (provider instanceof ActiveImageSourceProvider)
	((ActiveImageSourceProvider) provider).setImageData(((ImageElement) data));
	}
	}

	public synchronized void reset() {
	mLastPlugin = ""; //$NON-NLS-1$
	mElements.clear();
	mPluginImageContainer = null;
	}
	}
	}