EDIT

/**

* Copyright (C) 2007 EDIT

* European Distributed Institute of Taxonomy 

* http://www.e-taxonomy.eu

* 

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.taxeditor.ui.openurl;

import java.util.List;

import org.eclipse.jface.operation.IRunnableWithProgress;

import org.eclipse.jface.wizard.WizardPage;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.events.SelectionListener;

import org.eclipse.swt.layout.GridData;

import org.eclipse.swt.layout.GridLayout;

import org.eclipse.swt.widgets.Button;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Label;

import org.eclipse.ui.forms.widgets.ScrolledForm;

import eu.etaxonomy.cdm.common.URI;

import eu.etaxonomy.cdm.ext.openurl.OpenUrlReference;

import eu.etaxonomy.taxeditor.model.MessagingUtils;

import eu.etaxonomy.taxeditor.ui.element.ImageElement;

import eu.etaxonomy.taxeditor.ui.element.LayoutConstants;

import eu.etaxonomy.taxeditor.ui.element.RootElement;

/**

 * @author n.hoffmann

 * @created Jan 31, 2011

 */

public class OpenUrlReferencePage extends WizardPage implements SelectionListener {

	public static final String NAME = "OpenUrlReferencePage";

	private static final int NEXT = 1;

	private static final int PREVIOUS = -1; 

	private ImageElement imageElement;

	private RootElement rootElement;

	private ScrolledForm scrolledForm;

	private Button button_next;

	private Button button_previous;

	private Composite container;

	private Label label_pageNumber; 

	protected OpenUrlReferencePage() {

		super(NAME);

	}

	@Override

	public void createControl(Composite parent) {

		container = getWizard().getFormFactory().createComposite(parent, SWT.NULL);

		container.setLayout(new GridLayout());

		container.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

		scrolledForm = getWizard().getFormFactory().createScrolledForm(container);

		scrolledForm.getBody().setLayout(LayoutConstants.LAYOUT(3, false));

		scrolledForm.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, true));

		Composite buttonContainer = getWizard().getFormFactory().createComposite(container);

		buttonContainer.setLayout(new GridLayout(3, true));

		buttonContainer.setLayoutData(new GridData(SWT.FILL, SWT.BOTTOM, true, false));

		button_previous = getWizard().getFormFactory().createButton(buttonContainer, "Previous", SWT.PUSH);

		button_previous.addSelectionListener(this);

		button_previous.setLayoutData(new GridData(SWT.LEFT, SWT.BOTTOM, true, false));

		label_pageNumber = getWizard().getFormFactory().createLabel(buttonContainer, "              "); 

		label_pageNumber.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, true, false));

		button_next = getWizard().getFormFactory().createButton(buttonContainer, "Next", SWT.PUSH);

		button_next.addSelectionListener(this);

		button_next.setLayoutData(new GridData(SWT.RIGHT, SWT.BOTTOM, true, false));

		scrolledForm.getBody().setLayoutData(LayoutConstants.FILL());

		rootElement = new RootElement(getWizard().getFormFactory(), scrolledForm.getBody());

		imageElement = getWizard().getFormFactory().createImageElement(rootElement, null, SWT.BORDER);

		setControl(container);

	}

	public OpenUrlSelectorWizard getWizard(){

		return (OpenUrlSelectorWizard) super.getWizard();

	}

	public void displayImage() {

		URI imageUri = getWizard().getOpenUrlReferenceImageUri();

		try {

			imageElement.initImageUri(imageUri);

			IRunnableWithProgress runnable = imageElement.getLoadImageRunnable(new Runnable(){

				/* (non-Javadoc)

				 * @see java.lang.Runnable#run()

				 */

				@Override

				public void run() {

					container.layout();

					configurePageBar();

				}

			});

			getWizard().getContainer().run(true, false, runnable);

		} catch (Exception e) {

			MessagingUtils.messageDialog("Could not load image", getClass(), e.getMessage()  + ": " + imageUri , e);

		}

	}

	private void configurePageBar() {

		setTitle(getWizard().getOpenUrlReference().getTitleCache());

		String pageNumber = getWizard().getOpenUrlReference().getPages();

		label_pageNumber.setText(pageNumber);

		button_previous.setEnabled(canPage(PREVIOUS));

		button_next.setEnabled(canPage(NEXT));

	}

	@Override

	public void widgetSelected(SelectionEvent e) {

		if(e.getSource() == button_next){

			pageResult(NEXT);

		}else{

			pageResult(PREVIOUS);

		}

	}

	private void pageResult(int direction){

		try {

			List<OpenUrlReference> referenceList = getWizard().getOpenUrlServiceWrapper().doPage(getWizard().getOpenUrlReference(), direction);

			OpenUrlReference openUrlReference = referenceList.iterator().next();

			getWizard().setOpenUrlReference(openUrlReference);

			displayImage();

			setErrorMessage(null);

		} catch (IllegalArgumentException e) {

			setErrorMessage(String.format("Could not page: %s", e.getLocalizedMessage()));

		} catch (Exception e) {

			MessagingUtils.error(getClass(), e);

		}

	}

	private boolean canPage(int direction){

		try{

			getWizard().getOpenUrlServiceWrapper().doPage(getWizard().getOpenUrlReference(), direction);

		}catch (IllegalArgumentException e) {

			return false;

		}

		return true;

	}

	@Override

	public void widgetDefaultSelected(SelectionEvent e) {}

}