Java tutorial
/******************************************************************************* * Copyright (c) 2001, 2009 IBM Corporation 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: * IBM Corporation - initial API and implementation * Jens Lukowski/Innoopract - initial renaming/restructuring * *******************************************************************************/ package org.eclipse.wst.xml.ui.views.contentoutline; import org.eclipse.core.runtime.IPath; import org.eclipse.jface.action.IMenuListener; import org.eclipse.jface.action.IMenuManager; import org.eclipse.jface.preference.IPreferenceStore; import org.eclipse.jface.util.LocalSelectionTransfer; import org.eclipse.jface.util.SafeRunnable; import org.eclipse.jface.util.TransferDragSourceListener; import org.eclipse.jface.util.TransferDropTargetListener; import org.eclipse.jface.viewers.IContentProvider; import org.eclipse.jface.viewers.ILabelProvider; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.swt.dnd.DND; import org.eclipse.swt.dnd.DragSourceEvent; import org.eclipse.swt.dnd.DropTargetEvent; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.TableItem; import org.eclipse.swt.widgets.TreeItem; import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel; import org.eclipse.wst.sse.ui.internal.IReleasable; import org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration; import org.eclipse.wst.xml.ui.internal.XMLUIPlugin; import org.eclipse.wst.xml.ui.internal.contentoutline.JFaceNodeContentProvider; import org.eclipse.wst.xml.ui.internal.contentoutline.JFaceNodeLabelProvider; import org.eclipse.wst.xml.ui.internal.contentoutline.XMLNodeActionManager; import org.eclipse.wst.xml.ui.internal.dnd.DragNodeCommand; import org.w3c.dom.Attr; import org.w3c.dom.Node; /** * Basic Outline Configuration for generic XML support. Expects that the viewer's * input will be the DOM Model, and provides basic label and content providers. * * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration * @since 3.1 */ public abstract class AbstractXMLContentOutlineConfiguration extends ContentOutlineConfiguration { private class ActionManagerMenuListener implements IMenuListener, IReleasable { private XMLNodeActionManager fActionManager; private TreeViewer fTreeViewer; public ActionManagerMenuListener(TreeViewer viewer) { fTreeViewer = viewer; } /* * (non-Javadoc) * * @see org.eclipse.jface.action.IMenuListener#menuAboutToShow(org.eclipse.jface.action.IMenuManager) */ public void menuAboutToShow(IMenuManager manager) { if (fActionManager == null) { fActionManager = createNodeActionManager(fTreeViewer); } if (fActionManager != null) { fActionManager.fillContextMenu(manager, fTreeViewer.getSelection()); } } /* * (non-Javadoc) * * @see org.eclipse.wst.sse.ui.internal.IReleasable#release() */ public void release() { fTreeViewer = null; if (fActionManager != null) { fActionManager.setModel(null); } } } private static class StatusLineLabelProvider extends JFaceNodeLabelProvider { public StatusLineLabelProvider() { super(); } public String getText(Object element) { if (element == null) return null; if (!(element instanceof Node)) { return super.getText(element); } StringBuffer s = new StringBuffer(); Node node = (Node) element; while (node != null) { if (node.getNodeType() != Node.DOCUMENT_NODE) { s.insert(0, super.getText(node)); } if (node.getNodeType() == Node.ATTRIBUTE_NODE) node = ((Attr) node).getOwnerElement(); else node = node.getParentNode(); if (node != null && node.getNodeType() != Node.DOCUMENT_NODE) { s.insert(0, IPath.SEPARATOR); } } return s.toString(); } } private IContentProvider fContentProvider = null; private ActionManagerMenuListener fContextMenuFiller = null; private ILabelProvider fLabelProvider = null; boolean fShowAttributes = false; private ILabelProvider fSimpleLabelProvider; private TransferDragSourceListener[] fTransferDragSourceListeners; private TransferDropTargetListener[] fTransferDropTargetListeners; /** * Create new instance of XMLContentOutlineConfiguration */ public AbstractXMLContentOutlineConfiguration() { // Must have empty constructor to createExecutableExtension super(); } /** * Returns the NodeActionManager to use for the given treeViewer. * <p> * Not API. May be removed in the future. * </p> * * @param treeViewer * the TreeViewer associated with this configuration * @return a node action manager for use with this tree viewer */ protected XMLNodeActionManager createNodeActionManager(TreeViewer treeViewer) { return new XMLNodeActionManager((IStructuredModel) treeViewer.getInput(), treeViewer); } /* * (non-Javadoc) * * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getContentProvider(org.eclipse.jface.viewers.TreeViewer) */ public IContentProvider getContentProvider(TreeViewer viewer) { if (fContentProvider == null) { fContentProvider = new JFaceNodeContentProvider(); } return fContentProvider; } /* * (non-Javadoc) * * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getLabelProvider(org.eclipse.jface.viewers.TreeViewer) */ public ILabelProvider getLabelProvider(TreeViewer viewer) { if (fLabelProvider == null) { fLabelProvider = new JFaceNodeLabelProvider(); } return fLabelProvider; } /* * (non-Javadoc) * * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getMenuListener(org.eclipse.jface.viewers.TreeViewer) */ public IMenuListener getMenuListener(TreeViewer viewer) { if (fContextMenuFiller == null) { fContextMenuFiller = new ActionManagerMenuListener(viewer); } return fContextMenuFiller; } /* * (non-Javadoc) * * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getPreferenceStore() */ protected IPreferenceStore getPreferenceStore() { return XMLUIPlugin.getDefault().getPreferenceStore(); } public ILabelProvider getStatusLineLabelProvider(TreeViewer treeViewer) { if (fSimpleLabelProvider == null) { fSimpleLabelProvider = new StatusLineLabelProvider(); } return fSimpleLabelProvider; } /* * (non-Javadoc) * * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getTransferDragSourceListeners(org.eclipse.jface.viewers.TreeViewer) */ public TransferDragSourceListener[] getTransferDragSourceListeners(final TreeViewer treeViewer) { if (fTransferDragSourceListeners == null) { fTransferDragSourceListeners = new TransferDragSourceListener[] { new TransferDragSourceListener() { public void dragFinished(DragSourceEvent event) { LocalSelectionTransfer.getTransfer().setSelection(null); } public void dragSetData(DragSourceEvent event) { } public void dragStart(DragSourceEvent event) { LocalSelectionTransfer.getTransfer().setSelection(treeViewer.getSelection()); } public Transfer getTransfer() { return LocalSelectionTransfer.getTransfer(); } } }; } return fTransferDragSourceListeners; } /* * (non-Javadoc) * * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#getTransferDropTargetListeners(org.eclipse.jface.viewers.TreeViewer) */ public TransferDropTargetListener[] getTransferDropTargetListeners(final TreeViewer treeViewer) { if (fTransferDropTargetListeners == null) { fTransferDropTargetListeners = new TransferDropTargetListener[] { new TransferDropTargetListener() { public void dragEnter(DropTargetEvent event) { } public void dragLeave(DropTargetEvent event) { } public void dragOperationChanged(DropTargetEvent event) { } public void dragOver(DropTargetEvent event) { event.feedback = DND.FEEDBACK_SELECT; float feedbackFloat = getHeightInItem(event); if (feedbackFloat > 0.75) { event.feedback = DND.FEEDBACK_INSERT_AFTER; } else if (feedbackFloat < 0.25) { event.feedback = DND.FEEDBACK_INSERT_BEFORE; } event.feedback |= DND.FEEDBACK_EXPAND | DND.FEEDBACK_SCROLL; } public void drop(DropTargetEvent event) { if (event.operations != DND.DROP_NONE && LocalSelectionTransfer.getTransfer().getSelection() != null && !LocalSelectionTransfer.getTransfer().getSelection().isEmpty()) { IStructuredSelection selection = (IStructuredSelection) LocalSelectionTransfer.getTransfer() .getSelection(); if (selection != null && !selection.isEmpty() && event.item != null && event.item.getData() != null) { /* * the command uses these numbers instead of the * feedback constants (even though it converts in * the other direction as well) */ float feedbackFloat = getHeightInItem(event); final DragNodeCommand command = new DragNodeCommand(event.item.getData(), feedbackFloat, event.operations, event.detail, selection.toList(), treeViewer); if (command != null && command.canExecute()) { SafeRunnable.run(new SafeRunnable() { public void run() throws Exception { command.execute(); } }); } } } } public void dropAccept(DropTargetEvent event) { } private float getHeightInItem(DropTargetEvent event) { if (event.item == null) return .5f; if (event.item instanceof TreeItem) { TreeItem treeItem = (TreeItem) event.item; Control control = treeItem.getParent(); Point point = control.toControl(new Point(event.x, event.y)); Rectangle bounds = treeItem.getBounds(); return (float) (point.y - bounds.y) / (float) bounds.height; } else if (event.item instanceof TableItem) { TableItem tableItem = (TableItem) event.item; Control control = tableItem.getParent(); Point point = control.toControl(new Point(event.x, event.y)); Rectangle bounds = tableItem.getBounds(0); return (float) (point.y - bounds.y) / (float) bounds.height; } else { return 0.0F; } } public Transfer getTransfer() { return LocalSelectionTransfer.getTransfer(); } public boolean isEnabled(DropTargetEvent event) { return getTransfer().isSupportedType(event.currentDataType); } } }; } return fTransferDropTargetListeners; } /* * (non-Javadoc) * * @see org.eclipse.wst.sse.ui.views.contentoutline.ContentOutlineConfiguration#unconfigure(org.eclipse.jface.viewers.TreeViewer) */ public void unconfigure(TreeViewer viewer) { super.unconfigure(viewer); fTransferDragSourceListeners = null; fTransferDropTargetListeners = null; if (fContextMenuFiller != null) { fContextMenuFiller.release(); fContextMenuFiller = null; } } }