| /******************************************************************************* |
| * 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.part; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtension; |
| import org.eclipse.core.runtime.IExtensionPoint; |
| import org.eclipse.core.runtime.IExtensionRegistry; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.jface.viewers.StructuredViewer; |
| import org.eclipse.jface.viewers.ViewerDropAdapter; |
| import org.eclipse.swt.dnd.DND; |
| import org.eclipse.swt.dnd.DropTargetEvent; |
| import org.eclipse.swt.dnd.TransferData; |
| import org.eclipse.ui.PlatformUI; |
| import org.eclipse.ui.internal.WorkbenchPlugin; |
| import org.eclipse.ui.internal.registry.IWorkbenchRegistryConstants; |
| |
| /** |
| * Adapter for adding handling of the <code>PluginTransfer</code> drag and drop |
| * transfer type to a drop action. |
| * <p> |
| * This class may be instantiated or subclassed. |
| * </p> |
| */ |
| public class PluginDropAdapter extends ViewerDropAdapter { |
| /** |
| * The extension point attribute that defines the drop action class. |
| */ |
| public static final String ATT_CLASS = "class";//$NON-NLS-1$ |
| |
| /** |
| * The current transfer data, or <code>null</code> if none. |
| */ |
| private TransferData currentTransfer; |
| |
| /** |
| * Creates a plug-in drop adapter for the given viewer. |
| * |
| * @param viewer the viewer |
| */ |
| public PluginDropAdapter(StructuredViewer viewer) { |
| super(viewer); |
| } |
| |
| @Override |
| public void drop(DropTargetEvent event) { |
| try { |
| if (PluginTransfer.getInstance().isSupportedType(event.currentDataType)) { |
| PluginTransferData pluginData = (PluginTransferData) event.data; |
| IDropActionDelegate delegate = getPluginAdapter(pluginData); |
| if (!delegate.run(pluginData.getData(), getCurrentTarget())) { |
| event.detail = DND.DROP_NONE; |
| } |
| } else { |
| super.drop(event); |
| } |
| } catch (CoreException e) { |
| WorkbenchPlugin.log("Drop Failed", e.getStatus());//$NON-NLS-1$ |
| } |
| } |
| |
| /** |
| * Returns the current transfer. |
| */ |
| protected TransferData getCurrentTransfer() { |
| return currentTransfer; |
| } |
| |
| /** |
| * Loads the class that will perform the action associated with the given drop |
| * data. |
| * |
| * @param data the drop data |
| * @return the viewer drop adapter |
| */ |
| protected static IDropActionDelegate getPluginAdapter(PluginTransferData data) throws CoreException { |
| |
| IExtensionRegistry registry = Platform.getExtensionRegistry(); |
| String adapterName = data.getExtensionId(); |
| IExtensionPoint xpt = registry.getExtensionPoint(PlatformUI.PLUGIN_ID, |
| IWorkbenchRegistryConstants.PL_DROP_ACTIONS); |
| IExtension[] extensions = xpt.getExtensions(); |
| for (IExtension extension : extensions) { |
| IConfigurationElement[] configs = extension.getConfigurationElements(); |
| if (configs != null && configs.length > 0) { |
| for (IConfigurationElement config : configs) { |
| String id = config.getAttribute("id");//$NON-NLS-1$ |
| if (id != null && id.equals(adapterName)) { |
| return (IDropActionDelegate) WorkbenchPlugin.createExtension(config, ATT_CLASS); |
| } |
| } |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * @see ViewerDropAdapter#performDrop |
| */ |
| @Override |
| public boolean performDrop(Object data) { |
| // should never be called, since we override the drop() method. |
| return false; |
| } |
| |
| /** |
| * The <code>PluginDropAdapter</code> implementation of this |
| * <code>ViewerDropAdapter</code> method is used to notify the action that some |
| * aspect of the drop operation has changed. Subclasses may override. |
| */ |
| @Override |
| public boolean validateDrop(Object target, int operation, TransferData transferType) { |
| currentTransfer = transferType; |
| if (currentTransfer != null && PluginTransfer.getInstance().isSupportedType(currentTransfer)) { |
| // plugin cannot be loaded without the plugin data |
| return true; |
| } |
| return false; |
| } |
| } |