| /******************************************************************************* |
| * Copyright (c) 2004, 2005 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 |
| *******************************************************************************/ |
| package org.eclipse.ui.internal.presentations.util; |
| |
| import org.eclipse.jface.util.Geometry; |
| import org.eclipse.swt.graphics.Point; |
| import org.eclipse.swt.graphics.Rectangle; |
| import org.eclipse.swt.widgets.Control; |
| import org.eclipse.ui.internal.dnd.DragUtil; |
| import org.eclipse.ui.presentations.StackDropResult; |
| |
| /** |
| * @since 3.0 |
| */ |
| public class ReplaceDragHandler extends TabDragHandler { |
| |
| private final class DragCookie { |
| int insertPosition; |
| |
| public DragCookie(int pos) { |
| insertPosition = pos; |
| } |
| } |
| |
| private AbstractTabFolder tabFolder; |
| |
| public ReplaceDragHandler(AbstractTabFolder folder) { |
| this.tabFolder = folder; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.internal.presentations.util.TabDragHandler#dragOver(org.eclipse.swt.widgets.Control, org.eclipse.swt.graphics.Point) |
| */ |
| public StackDropResult dragOver(Control currentControl, Point location, |
| int dragStart) { |
| |
| // Determine which tab we're currently dragging over |
| //Point localPos = tabFolder.getControl().toControl(location); |
| |
| AbstractTabItem tabUnderPointer = tabFolder.getItem(location); |
| |
| // This drop target only deals with tabs... if we're not dragging over |
| // a tab, exit. |
| if (tabUnderPointer == null) { |
| Rectangle titleArea = tabFolder.getTabArea(); |
| |
| // If we're dragging over the title area, treat this as a drop in the last |
| // tab position. |
| if (titleArea.contains(location) && tabFolder.getItemCount() > 0) { |
| int dragOverIndex = tabFolder.getItemCount(); |
| AbstractTabItem lastTab = tabFolder.getItem(dragOverIndex - 1); |
| |
| // Can't drag to end unless you can see the end |
| if (!lastTab.isShowing()) { |
| return null; |
| } |
| |
| // If we are unable to compute the bounds for this tab, then ignore the drop |
| Rectangle lastTabBounds = lastTab.getBounds(); |
| if (lastTabBounds.isEmpty()) { |
| return null; |
| } |
| |
| if (dragStart >= 0) { |
| dragOverIndex--; |
| |
| return new StackDropResult(lastTabBounds, new Integer( |
| dragOverIndex)); |
| } |
| |
| // Make the drag-over rectangle look like a tab at the end of the tab region. |
| // We don't actually know how wide the tab will be when it's dropped, so just |
| // make it 3 times wider than it is tall. |
| Rectangle dropRectangle = titleArea; |
| |
| dropRectangle.x = lastTabBounds.x + lastTabBounds.width; |
| dropRectangle.width = 3 * dropRectangle.height; |
| return new StackDropResult(dropRectangle, new Integer( |
| dragOverIndex)); |
| |
| } else { |
| // If the closest side is the side with the tabs, consider this a stack operation. |
| // Otherwise, let the drop fall through to whatever the default behavior is |
| Rectangle displayBounds = DragUtil.getDisplayBounds(tabFolder.getControl()); |
| int closestSide = Geometry.getClosestSide(displayBounds, location); |
| if (closestSide == tabFolder.getTabPosition()) { |
| return new StackDropResult(displayBounds, null); |
| } |
| |
| return null; |
| } |
| } |
| |
| if (!tabUnderPointer.isShowing()) { |
| return null; |
| } |
| |
| Rectangle tabBounds = tabUnderPointer.getBounds(); |
| |
| if (tabBounds.isEmpty()) { |
| return null; |
| } |
| |
| return new StackDropResult(tabBounds, new DragCookie(tabFolder |
| .indexOf(tabUnderPointer))); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.internal.presentations.util.TabDragHandler#getInsertionPosition(java.lang.Object) |
| */ |
| public int getInsertionPosition(Object cookie) { |
| if (cookie instanceof DragCookie) { |
| return Math.min(tabFolder.getItemCount(), |
| ((DragCookie) cookie).insertPosition); |
| } |
| |
| return tabFolder.getItemCount(); |
| } |
| |
| } |