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/*******************************************************************************
* Copyright (c) 2000, 2015 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui;
/**
* A view is a visual component within a workbench page. It is typically used to
* navigate a hierarchy of information (like the workspace), open an editor, or
* display properties for the active editor. Modifications made in a view are
* saved immediately (in contrast to an editor part, which conforms to a more
* elaborate open-save-close lifecycle).
* <p>
* Only one instance of a particular view type may exist within a workbench
* page. This policy is designed to simplify part management for a user.
* </p>
* <p>
* This interface may be implemented directly. For convenience, a base
* implementation is defined in <code>ViewPart</code>.
* </p>
* <p>
* A view is added to the workbench in two steps:
* <ol>
* <li>A view extension is contributed to the workbench registry. This
* extension defines the extension id and extension class.</li>
* <li>The view is included in the default layout for a perspective.
* Alternatively, the user may open the view from the Perspective menu.</li>
* </ol>
* </p>
* <p>
* Views implement the <code>IAdaptable</code> interface; extensions are
* managed by the platform's adapter manager.
* </p>
* <p>
* As of 3.4, views may optionally adapt to {@link ISizeProvider} if they have
* a preferred size. The default presentation will make a best effort to
* allocate the preferred size to a view if it is the only part in a stack. If
* there is more than one part in the stack, the constraints will be disabled
* for that stack. The size constraints are adjusted for the size of the tab and
* border trim. Note that this is considered to be a hint to the presentation,
* and not all presentations may honor size constraints.
* </p>
*
* @see IWorkbenchPage#showView
* @see org.eclipse.ui.part.ViewPart
* @see ISizeProvider
*/
public interface IViewPart extends IWorkbenchPart, IPersistable {
/**
* Returns the site for this view.
* This method is equivalent to <code>(IViewSite) getSite()</code>.
* <p>
* The site can be <code>null</code> while the view is being initialized.
* After the initialization is complete, this value must be non-<code>null</code>
* for the remainder of the view's life cycle.
* </p>
*
* @return the view site; this value may be <code>null</code> if the view
* has not yet been initialized
*/
IViewSite getViewSite();
/**
* Initializes this view with the given view site.
* <p>
* This method is automatically called by the workbench shortly after the
* part is instantiated. It marks the start of the views's lifecycle. Clients must
* not call this method.
* </p>
*
* @param site the view site
* @exception PartInitException if this view was not initialized successfully
*/
void init(IViewSite site) throws PartInitException;
/**
* Initializes this view with the given view site. A memento is passed to
* the view which contains a snapshot of the views state from a previous
* session. Where possible, the view should try to recreate that state
* within the part controls.
* <p>
* This method is automatically called by the workbench shortly after the part
* is instantiated. It marks the start of the views's lifecycle. Clients must
* not call this method.
* </p>
*
* @param site the view site
* @param memento the IViewPart state or null if there is no previous saved state
* @exception PartInitException if this view was not initialized successfully
*/
void init(IViewSite site, IMemento memento) throws PartInitException;
/**
* Saves the object state within a memento.
*
* @param memento a memento to receive the object state
*/
@Override void saveState(IMemento memento);
}
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