bundles/org.eclipse.e4.tools.emf.ui/src/org/eclipse/e4/tools/emf/ui/internal/common/component/PlaceholderEditor.java

/*******************************************************************************
 * Copyright (c) 2010 BestSolution.at 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:
 *     Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation
 ******************************************************************************/
package org.eclipse.e4.tools.emf.ui.internal.common.component;

import java.net.MalformedURLException;
import java.net.URL;
import org.eclipse.core.databinding.UpdateValueStrategy;
import org.eclipse.core.databinding.conversion.Converter;
import org.eclipse.core.databinding.observable.list.IObservableList;
import org.eclipse.core.databinding.observable.value.WritableValue;
import org.eclipse.e4.tools.emf.ui.common.EStackLayout;
import org.eclipse.e4.tools.emf.ui.common.IModelResource;
import org.eclipse.e4.tools.emf.ui.common.Util;
import org.eclipse.e4.tools.emf.ui.common.component.AbstractComponentEditor;
import org.eclipse.e4.tools.emf.ui.internal.Messages;
import org.eclipse.e4.tools.emf.ui.internal.common.ModelEditor;
import org.eclipse.e4.tools.emf.ui.internal.common.component.dialogs.SharedElementsDialog;
import org.eclipse.e4.ui.model.application.impl.ApplicationPackageImpl;
import org.eclipse.e4.ui.model.application.ui.MUIElement;
import org.eclipse.e4.ui.model.application.ui.MUILabel;
import org.eclipse.e4.ui.model.application.ui.advanced.MPlaceholder;
import org.eclipse.e4.ui.model.application.ui.advanced.impl.AdvancedPackageImpl;
import org.eclipse.emf.databinding.EMFDataBindingContext;
import org.eclipse.emf.databinding.edit.EMFEditProperties;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.jface.databinding.swt.IWidgetValueProperty;
import org.eclipse.jface.databinding.swt.WidgetProperties;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Image;
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.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;

public class PlaceholderEditor extends AbstractComponentEditor {
	private Composite composite;
	private Image image;
	private EMFDataBindingContext context;
	private IModelResource resource;
	private EStackLayout stackLayout;

	public PlaceholderEditor(EditingDomain editingDomain, ModelEditor editor, IModelResource resource) {
		super(editingDomain, editor);
		this.resource = resource;
	}

	@Override
	public Image getImage(Object element, Display display) {
		if (image == null) {
			try {
				image = loadSharedImage(display, new URL("platform:/plugin/org.eclipse.e4.tools.emf.ui/icons/full/modelelements/Placeholder.gif")); //$NON-NLS-1$
			} catch (MalformedURLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		return image;
	}

	@Override
	public String getLabel(Object element) {
		return Messages.PlaceholderEditor_Label;
	}

	@Override
	public String getDetailLabel(Object element) {
		MPlaceholder pl = (MPlaceholder) element;
		if (pl.getRef() != null) {
			StringBuilder b = new StringBuilder();

			b.append(((EObject) pl.getRef()).eClass().getName());
			if (pl.getRef() instanceof MUILabel) {
				MUILabel label = (MUILabel) pl.getRef();
				if (label.getLabel() != null && label.getLabel().trim().length() > 0) {
					b.append(" (" + label.getLabel() + ")"); //$NON-NLS-1$//$NON-NLS-2$
				} else if (label.getTooltip() != null && label.getTooltip().trim().length() > 0) {
					b.append(" (" + label.getTooltip() + ")"); //$NON-NLS-1$ //$NON-NLS-2$
				} else {
					if (pl.getRef().getElementId() != null && pl.getRef().getElementId().trim().length() > 0) {
						b.append(pl.getRef().getElementId());
					}
				}
			} else {
				if (pl.getRef().getElementId() != null && pl.getRef().getElementId().trim().length() > 0) {
					b.append(" (" + pl.getRef().getElementId() + ")"); //$NON-NLS-1$//$NON-NLS-2$
				}
			}

			return b.toString();
		}

		return null;
	}

	@Override
	public String getDescription(Object element) {
		return Messages.PlaceholderEditor_Descriptor;
	}

	@Override
	public Composite getEditor(Composite parent, Object object) {
		if (composite == null) {
			context = new EMFDataBindingContext();
			if (getEditor().isModelFragment()) {
				composite = new Composite(parent, SWT.NONE);
				stackLayout = new EStackLayout();
				composite.setLayout(stackLayout);
				createForm(composite, context, getMaster(), false);
				createForm(composite, context, getMaster(), true);
			} else {
				composite = createForm(parent, context, getMaster(), false);
			}
		}

		if (getEditor().isModelFragment()) {
			Control topControl;
			if (Util.isImport((EObject) object)) {
				topControl = composite.getChildren()[1];
			} else {
				topControl = composite.getChildren()[0];
			}

			if (stackLayout.topControl != topControl) {
				stackLayout.topControl = topControl;
				composite.layout(true, true);
			}
		}

		getMaster().setValue(object);
		return composite;
	}

	private Composite createForm(Composite parent, final EMFDataBindingContext context, WritableValue master, boolean isImport) {
		parent = new Composite(parent, SWT.NONE);
		parent.setLayout(new GridLayout(3, false));

		IWidgetValueProperty textProp = WidgetProperties.text(SWT.Modify);

		if (isImport) {
			ControlFactory.createFindImport(parent, this, context);
			return parent;
		}

		// ------------------------------------------------------------
		{
			Label l = new Label(parent, SWT.NONE);
			l.setText(Messages.PlaceholderEditor_Id);
			l.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_END));

			Text t = new Text(parent, SWT.BORDER);
			GridData gd = new GridData(GridData.FILL_HORIZONTAL);
			gd.horizontalSpan = 2;
			t.setLayoutData(gd);
			context.bindValue(textProp.observeDelayed(200, t), EMFEditProperties.value(getEditingDomain(), ApplicationPackageImpl.Literals.APPLICATION_ELEMENT__ELEMENT_ID).observeDetail(getMaster()));
		}

		// ------------------------------------------------------------
		{
			Label l = new Label(parent, SWT.NONE);
			l.setText("Reference");
			l.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_END));

			Text t = new Text(parent, SWT.BORDER);
			t.setEditable(false);
			GridData gd = new GridData(GridData.FILL_HORIZONTAL);
			t.setLayoutData(gd);

			UpdateValueStrategy t2m = new UpdateValueStrategy();
			t2m.setConverter(new Converter(String.class, MUIElement.class) {

				public Object convert(Object fromObject) {
					return null;
				}
			});
			UpdateValueStrategy m2t = new UpdateValueStrategy();
			m2t.setConverter(new Converter(MUIElement.class, String.class) {

				public Object convert(Object fromObject) {
					if (fromObject != null) {
						EObject o = (EObject) fromObject;
						if (o instanceof MUILabel) {
							MUILabel label = (MUILabel) o;
							if (!Util.isNullOrEmpty(label.getLabel())) {
								return o.eClass().getName() + " - " + label.getLabel();
							}
						}

						return o.eClass().getName() + " - " + ((MUIElement) fromObject).getElementId();
					}
					return null;
				}
			});

			context.bindValue(textProp.observe(t), EMFEditProperties.value(getEditingDomain(), AdvancedPackageImpl.Literals.PLACEHOLDER__REF).observeDetail(getMaster()), t2m, m2t);

			final Button b = new Button(parent, SWT.PUSH | SWT.FLAT);
			b.setImage(getImage(b.getDisplay(), SEARCH_IMAGE));
			b.setText(Messages.PlaceholderEditor_FindReference);
			b.addSelectionListener(new SelectionAdapter() {
				@Override
				public void widgetSelected(SelectionEvent e) {
					SharedElementsDialog dialog = new SharedElementsDialog(b.getShell(), getEditor(), (MPlaceholder) getMaster().getValue(), resource);
					dialog.open();
				}
			});
		}

		return parent;
	}

	@Override
	public IObservableList getChildList(Object element) {
		return null;
	}

}