plugins/org.eclipse.objectteams.otdt.samples/src/org/eclipse/objectteams/otdt/internal/samples/SelectionPage.java

/*******************************************************************************
 * Copyright (c) 2016 GK Software AG, 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:
 *     Stephan Herrmann - initial API and implementation
 *******************************************************************************/
package org.eclipse.objectteams.otdt.internal.samples;

import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.jface.viewers.*;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.pde.internal.ui.*;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.*;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.forms.widgets.FormToolkit;

public class SelectionPage extends WizardPage {

	private SelectionPart part;
	private Text desc;
	private SampleWizard wizard;
	private PDEImages pdeImages;

	@SuppressWarnings("restriction")
	class SelectionPart extends org.eclipse.pde.internal.ui.parts.TablePart {
		public SelectionPart() {
			super(new String[] {"More Info"}); //$NON-NLS-1$
		}

		@Override
		protected void buttonSelected(Button button, int index) {
			if (index == 0)
				doMoreInfo();
		}

		@Override
		protected void selectionChanged(IStructuredSelection selection) {
			updateSelection(selection);
		}

		@Override
		protected void handleDoubleClick(IStructuredSelection selection) {
		}

		// expose to avoid access warnings outside this class
		@Override public void setMinimumSize(int width, int height) { super.setMinimumSize(width, height); }
		@Override public void createControl(Composite parent, int style, int span, FormToolkit toolkit) { super.createControl(parent, style, span, toolkit); }
		@Override public TableViewer getTableViewer() { return super.getTableViewer(); }
		@Override public void setButtonEnabled(int index, boolean enabled) { super.setButtonEnabled(index, enabled); }
	}

	class SampleProvider implements IStructuredContentProvider {
		@Override
		public Object[] getElements(Object input) {
			return wizard.getSamples();
		}
	}

	class SampleLabelProvider extends LabelProvider {
		private Image image;

		public SampleLabelProvider() {
			image = pdeImages.get(PDEImages.DESC_NEWEXP_TOOL);
		}

		@Override
		public String getText(Object obj) {
			IConfigurationElement sample = (IConfigurationElement) obj;
			return sample.getAttribute("name"); //$NON-NLS-1$
		}

		@Override
		public Image getImage(Object obj) {
			return image;
		}
	}

	/**
	 * @param pageName
	 */
	public SelectionPage(SampleWizard wizard) {
		super("selection"); //$NON-NLS-1$
		this.wizard = wizard;
		setTitle(Messages.SelectionPage_title);
		setDescription(Messages.SelectionPage_desc);
		part = new SelectionPart();
		pdeImages = PDEImages.connect(this);
	}

	@Override
	public void createControl(Composite parent) {
		Composite container = new Composite(parent, SWT.NULL);
		GridLayout layout = new GridLayout();
		container.setLayout(layout);
		layout.numColumns = 2;
		part.setMinimumSize(300, 300);
		part.createControl(container, SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER, 2, null);
		part.getTableViewer().setContentProvider(new SampleProvider());
		part.getTableViewer().setLabelProvider(new SampleLabelProvider());
		desc = new Text(container, SWT.MULTI | SWT.BORDER | SWT.WRAP | SWT.V_SCROLL);
		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
		gd.heightHint = 64;
		desc.setLayoutData(gd);
		part.getTableViewer().setInput(this);
		updateSelection(null);
		setControl(container);

		PlatformUI.getWorkbench().getHelpSystem().setHelp(container, IHelpContextIds.SELECTION);
	}
	
	@Override
	public void dispose() {
		pdeImages.disconnect(this);
		super.dispose();
	}

	private void doMoreInfo() {
		if (wizard.getSelection() != null) {
			IConfigurationElement desc[] = wizard.getSelection().getChildren("description"); //$NON-NLS-1$
			String helpHref = desc[0].getAttribute("helpHref"); //$NON-NLS-1$
			PlatformUI.getWorkbench().getHelpSystem().displayHelpResource(helpHref);
		}
	}

	private void updateSelection(IStructuredSelection selection) {
		if (selection == null) {
			desc.setText(""); //$NON-NLS-1$
			part.setButtonEnabled(0, false);
			setPageComplete(false);
		} else {
			IConfigurationElement sample = (IConfigurationElement) selection.getFirstElement();
			String text = ""; //$NON-NLS-1$
			String helpHref = null;
			IConfigurationElement[] sampleDesc = sample.getChildren("description"); //$NON-NLS-1$
			if (sampleDesc.length == 1) {
				text = sampleDesc[0].getValue();
				helpHref = sampleDesc[0].getAttribute("helpHref"); //$NON-NLS-1$
			}
			desc.setText(text);
			part.setButtonEnabled(0, helpHref != null);
			wizard.setSelection(sample);
			wizard.updateEntries();
			setPageComplete(true);
		}
	}
}