target_explorer/plugins/org.eclipse.tcf.te.ui.views/src/org/eclipse/tcf/te/ui/views/editor/pages/AbstractEditorPage.java

/*******************************************************************************
 * Copyright (c) 2011, 2016 Wind River Systems, Inc. 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:
 * Wind River Systems - initial API and implementation
 *******************************************************************************/
package org.eclipse.tcf.te.ui.views.editor.pages;

import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IMessageProvider;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.osgi.util.NLS;
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.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.tcf.te.runtime.nls.Messages;
import org.eclipse.tcf.te.ui.jface.interfaces.IValidatingContainer;
import org.eclipse.tcf.te.ui.views.activator.UIPlugin;
import org.eclipse.tcf.te.ui.views.editor.Editor;
import org.eclipse.tcf.te.ui.views.interfaces.IEditorPage;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.forms.IManagedForm;
import org.eclipse.ui.forms.editor.FormPage;
import org.eclipse.ui.forms.widgets.ScrolledForm;
import org.eclipse.ui.part.MultiPageSelectionProvider;

/**
 * Abstract details editor page implementation.
 */
public abstract class AbstractEditorPage extends FormPage implements IEditorPage, IValidatingContainer {
	// The unique page id
	private String id;
	private Composite messageComp = null;
	private Label message = null;
	private Label messageType = null;
	private boolean hasHeadClient;
	/**
	 * Constructor.
	 */
	public AbstractEditorPage() {
		super("", ""); // //$NON-NLS-1$ //$NON-NLS-2$
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.part.EditorPart#setInitializationData(org.eclipse.core.runtime.
	 * IConfigurationElement, java.lang.String, java.lang.Object)
	 */
	@Override
	public void setInitializationData(IConfigurationElement config, String propertyName, Object data) {
		super.setInitializationData(config, propertyName, data);

		if (config != null) {
			// Initialize the id field by reading the <id> extension attribute.
			// Throws an exception if the id is empty or null.
			id = config.getAttribute("id"); //$NON-NLS-1$
			if (id == null || id.trim().length() == 0) {
				IStatus status = new Status(IStatus.ERROR, UIPlugin.getUniqueIdentifier(),
								            NLS.bind(Messages.Extension_error_missingRequiredAttribute, "id", config.getContributor().getName())); //$NON-NLS-1$
				UIPlugin.getDefault().getLog().log(status);
			}
		}
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.forms.editor.FormPage#getId()
	 */
	@Override
	public String getId() {
		return id;
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * org.eclipse.ui.forms.editor.FormPage#createFormContent(org.eclipse.ui.forms.IManagedForm)
	 */
	@Override
	protected void createFormContent(IManagedForm managedForm) {
		super.createFormContent(managedForm);
		Assert.isNotNull(managedForm);
		managedForm.setInput(getEditorInputNode());

		messageComp = new Composite(managedForm.getForm().getForm().getHead(), SWT.NONE);
		GridLayout gl = new GridLayout(2, false);
		gl.marginHeight = 0;
		gl.marginWidth = 0;
		gl.marginLeft = 0;
		gl.marginRight = 0;
		messageComp.setLayout(gl);

		messageType = new Label(messageComp, SWT.NONE);
		GridData gd = new GridData(20, 20);
		messageType.setLayoutData(gd);
		message = new Label(messageComp, SWT.NONE);
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.part.EditorPart#setInput(org.eclipse.ui.IEditorInput)
	 */
	@Override
	protected void setInput(IEditorInput input) {
		super.setInput(input);
		// Update the managed form too
		if (getManagedForm() != null) {
			getManagedForm().setInput(getEditorInputNode());
		}
		getSite().getSelectionProvider().setSelection(input != null ? new StructuredSelection(getEditorInputNode()) : null);
		// The part name may change if the input changes
		setPartName(getPartName());
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.part.EditorPart#setInputWithNotify(org.eclipse.ui.IEditorInput)
	 */
	@Override
	protected void setInputWithNotify(IEditorInput input) {
		super.setInputWithNotify(input);
		// Update the managed form too
		if (getManagedForm() != null) {
			getManagedForm().setInput(getEditorInputNode());
		}
		getSite().getSelectionProvider().setSelection(input != null ? new StructuredSelection(getEditorInputNode()) : null);
		// The part name may change if the input changes
		setPartName(getPartName());
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.forms.editor.FormPage#setActive(boolean)
	 */
	@Override
	public void setActive(boolean active) {
		super.setActive(active);
		if (active) {
			ISelection selection = getEditorInput() != null ? new StructuredSelection(getEditorInputNode()) : null;
			getSite().getSelectionProvider().setSelection(selection);
			if (getSite().getSelectionProvider() instanceof MultiPageSelectionProvider) {
				SelectionChangedEvent changedEvent = new SelectionChangedEvent(getSite().getSelectionProvider(), selection);
				((MultiPageSelectionProvider) getSite().getSelectionProvider()).fireSelectionChanged(changedEvent);
			}
		}
	}

	/**
	 * Returns the node associated with the current editor input.
	 *
	 * @return The node or <code>null</code>.
	 */
	public Object getEditorInputNode() {
		IEditorInput input = getEditorInput();
		return input != null ? input.getAdapter(Object.class) : null;
	}

	/**
	 * Called from the parent properties editor <code>doSave(IProgressMonitor)</code> method.
	 *
	 * @param monitor The progress monitor or <code>null</code>
	 * @see Editor#doSave(IProgressMonitor)
	 */
	public void preDoSave(IProgressMonitor monitor) {
		// do nothing
	}

	/**
	 * Called from the parent properties editor <code>doSave(IProgressMonitor)</code> method.
	 *
	 * @param monitor The progress monitor or <code>null</code>
	 * @see Editor#doSave(IProgressMonitor)
	 */
	public void postDoSave(IProgressMonitor monitor) {
		// do nothing
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.tcf.te.ui.jface.interfaces.IValidatingContainer#validate()
	 */
	@Override
	public final void validate() {
		ValidationResult result = doValidate();
		if (result != null)
			setMessage(result.getMessage(), result.getMessageType());
		else
			setMessage(null, IMessageProvider.NONE);
	}

	/**
	 * Get the image for the given message type.
	 * @param messageType The message type.
	 * @return The image.
	 */
	protected Image getMessageImage(int messageType) {
		switch (messageType) {
		case IMessageProvider.INFORMATION:
			return JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_INFO);
		case IMessageProvider.WARNING:
			return JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_WARNING);
		case IMessageProvider.ERROR:
			return JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_ERROR);
		default:
			return null;
		}
	}

	/**
	 * Set a message to this editor page.
	 * @param message The message.
	 * @param messageType The message type.
	 */
	@Override
    public void setMessage(String text, int type) {
		if (getManagedForm() != null && messageComp != null && message != null && messageType != null) {
			ScrolledForm form = getManagedForm().getForm();

			if (text != null) {
				messageType.setImage(getMessageImage(type));
				message.setText(text);
				form.setHeadClient(messageComp);
				hasHeadClient = true;
			}
			else if (hasHeadClient) {
				form.setHeadClient(null);
				hasHeadClient = false;
			}
		}
	}

	/**
	 * Do the validation.
	 *
	 * @return The validation result or <code>null</code>.
	 */
	protected ValidationResult doValidate() {
		return new ValidationResult();
	}
}