X-Git-Url: http://secure.phpeclipse.com diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/dnd/JdtViewerDropAdapter.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/dnd/JdtViewerDropAdapter.java deleted file mode 100644 index 99dc11f..0000000 --- a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/dnd/JdtViewerDropAdapter.java +++ /dev/null @@ -1,260 +0,0 @@ -/******************************************************************************* - * Copyright (c) 2000, 2003 IBM Corporation and others. - * All rights reserved. This program and the accompanying materials - * are made available under the terms of the Common Public License v1.0 - * which accompanies this distribution, and is available at - * http://www.eclipse.org/legal/cpl-v10.html - * - * Contributors: - * IBM Corporation - initial API and implementation - *******************************************************************************/ -package net.sourceforge.phpdt.internal.ui.dnd; - -import org.eclipse.jface.util.Assert; -import org.eclipse.jface.viewers.StructuredViewer; -import org.eclipse.swt.dnd.DND; -import org.eclipse.swt.dnd.DropTargetEvent; -import org.eclipse.swt.dnd.DropTargetListener; -import org.eclipse.swt.graphics.Point; -import org.eclipse.swt.graphics.Rectangle; -import org.eclipse.swt.widgets.Item; -import org.eclipse.swt.widgets.TableItem; -import org.eclipse.swt.widgets.TreeItem; - -/** - * A drag and drop adapter to be used together with structured viewers. - * The adapater delegates the dragEnter, dragOperationChanged - * , dragOver and dropAccept method to the - * validateDrop method. Furthermore it adds location feedback. - */ -public class JdtViewerDropAdapter implements DropTargetListener { - - /** - * Constant describing the position of the mouse cursor relative - * to the target object. This means the mouse is positioned - * slightly before the target. - */ - protected static final int LOCATION_BEFORE= 1; - - /** - * Constant describing the position of the mouse cursor relative - * to the target object. This means the mouse is positioned - * slightly after the target. - */ - protected static final int LOCATION_AFTER= 2; - - /** - * Constant describing the position of the mouse cursor relative - * to the target object. This means the mouse is positioned - * directly on the target. - */ - protected static final int LOCATION_ON= 3; - - /** - * Constant describing the position of the mouse cursor relative - * to the target object. This means the mouse is not positioned - * over or near any valid target. - */ - protected static final int LOCATION_NONE= 4; - - /** - * The threshold used to determine if the mouse is before or after - * an item. - */ - private static final int LOCATION_EPSILON= 5; - - /** - * Style to enable location feedback. - */ - public static final int INSERTION_FEEDBACK= 1 << 1; - - private StructuredViewer fViewer; - private int fFeedback; - private boolean fShowInsertionFeedback; - private int fRequestedOperation; - private int fLastOperation; - protected int fLocation; - protected Object fTarget; - - public JdtViewerDropAdapter(StructuredViewer viewer, int feedback) { - fViewer= viewer; - Assert.isNotNull(fViewer); - fFeedback= feedback; - fLastOperation= -1; - } - - /** - * Controls whether the drop adapter shows insertion feedback or not. - * - * @param showInsertionFeedback true if the drop adapter is supposed - * to show insertion feedback. Otherwise false - */ - public void showInsertionFeedback(boolean showInsertionFeedback) { - fShowInsertionFeedback= showInsertionFeedback; - } - - /** - * Returns the viewer this adapter is working on. - */ - protected StructuredViewer getViewer() { - return fViewer; - } - - //---- Hooks to override ----------------------------------------------------- - - /** - * The actual drop has occurred. Calls drop(Object target, DropTargetEvent event) - * . - * @see DropTargetListener#drop(org.eclipse.swt.dnd.DropTargetEvent) - */ - public void drop(DropTargetEvent event) { - drop(fTarget, event); - } - - /** - * The actual drop has occurred. - * @param target the drop target in form of a domain element. - * @param event the drop traget event - */ - public void drop(Object target, DropTargetEvent event) { - } - - /** - * Checks if the drop is valid. The method calls validateDrop - * (Object target, DropTargetEvent event). Implementors can alter the - * currentDataType field and the detail field - * to give feedback about drop acceptence. - */ - public void validateDrop(DropTargetEvent event) { - validateDrop(fTarget, event, fRequestedOperation); - } - - /** - * Checks if the drop on the current target is valid. The method - * can alter the currentDataType field and the - * detail field to give feedback about drop acceptence. - * @param target the drop target in form of a domain element. - * @param event the drop traget event - * @param operation the operation requested by the user. - */ - public void validateDrop(Object target, DropTargetEvent event, int operation) { - } - - public void dragEnter(DropTargetEvent event) { - dragOperationChanged(event); - } - - public void dragLeave(DropTargetEvent event) { - fTarget= null; - fLocation= LOCATION_NONE; - } - - public void dragOperationChanged(DropTargetEvent event) { - fRequestedOperation= event.detail; - fTarget= computeTarget(event); - fLocation= computeLocation(event); - validateDrop(event); - fLastOperation= event.detail; - computeFeedback(event); - } - - public void dragOver(DropTargetEvent event) { - Object oldTarget= fTarget; - fTarget= computeTarget(event); - - //set the location feedback - int oldLocation= fLocation; - fLocation= computeLocation(event); - if (oldLocation != fLocation || oldTarget != fTarget || fLastOperation != event.detail) { - validateDrop(event); - fLastOperation= event.detail; - } else { - event.detail= fLastOperation; - } - computeFeedback(event); - } - - public void dropAccept(DropTargetEvent event) { - fTarget= computeTarget(event); - validateDrop(event); - fLastOperation= event.detail; - } - - /** - * Returns the data held by event.item. Inside a viewer - * this corresponds to the items data model element. - */ - protected Object computeTarget(DropTargetEvent event) { - return event.item == null ? null : event.item.getData(); - } - - /** - * Returns the position of the given coordinates relative to the given target. - * The position is determined to be before, after, or on the item, based on - * some threshold value. The return value is one of the LOCATION_* constants - * defined in this class. - */ - final protected int computeLocation(DropTargetEvent event) { - if (!(event.item instanceof Item)) - return LOCATION_NONE; - - Item item= (Item) event.item; - Point coordinates= fViewer.getControl().toControl(new Point(event.x, event.y)); - Rectangle bounds= getBounds(item); - if (bounds == null) { - return LOCATION_NONE; - } - if ((coordinates.y - bounds.y) < LOCATION_EPSILON) { - return LOCATION_BEFORE; - } - if ((bounds.y + bounds.height - coordinates.y) < LOCATION_EPSILON) { - return LOCATION_AFTER; - } - return LOCATION_ON; - } - - /** - * Returns the bounds of the given item, or null if it is not a - * valid type of item. - */ - private Rectangle getBounds(Item item) { - if (item instanceof TreeItem) - return ((TreeItem) item).getBounds(); - - if (item instanceof TableItem) - return ((TableItem) item).getBounds(0); - - return null; - } - - /** - * Sets the drag under feedback corresponding to the value of fLocation - * and the INSERTION_FEEDBACK style bit. - */ - protected void computeFeedback(DropTargetEvent event) { - if (!fShowInsertionFeedback && fLocation != LOCATION_NONE) { - event.feedback= DND.FEEDBACK_SELECT; - } else { - if (fLocation == LOCATION_BEFORE) { - event.feedback= DND.FEEDBACK_INSERT_BEFORE; - } else if (fLocation == LOCATION_AFTER) { - event.feedback= DND.FEEDBACK_INSERT_AFTER; - } - } - event.feedback|= fFeedback; - } - - /** - * Sets the drop operation to DROP_NODE. - */ - protected void clearDropOperation(DropTargetEvent event) { - event.detail= DND.DROP_NONE; - } - - /** - * Returns the requested drop operation. - */ - protected int getRequestedOperation() { - return fRequestedOperation; - } -}