Mercurial > projects > dwt-mac
view dwt/dnd/TreeDropTargetEffect.d @ 104:61fdbc24abf2
Ported dwt.dnd.FileTransfer
author | Jacob Carlborg <doob@me.com> |
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date | Wed, 31 Dec 2008 14:23:11 +0100 |
parents | d8635bb48c7c |
children | 2d6116ea306e |
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/******************************************************************************* * Copyright (c) 2000, 2008 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 *******************************************************************************/ module dwt.dnd.TreeDropTargetEffect; import dwt.dwthelper.utils; import dwt.DWT; import dwt.graphics.Point; import dwt.graphics.Rectangle; import dwt.widgets.Event; import dwt.widgets.Tree; import dwt.widgets.TreeItem; /** * This class provides a default drag under effect (eg. select, insert, scroll and expand) * when a drag occurs over a <code>Tree</code>. * * <p>Classes that wish to provide their own drag under effect for a <code>Tree</code> * can extend the <code>TreeDropTargetEffect</code> class and override any applicable methods * in <code>TreeDropTargetEffect</code> to display their own drag under effect.</p> * * Subclasses that override any methods of this class must call the corresponding * <code>super</code> method to get the default drag under effect implementation. * * <p>The feedback value is either one of the FEEDBACK constants defined in * class <code>DND</code> which is applicable to instances of this class, * or it must be built by <em>bitwise OR</em>'ing together * (that is, using the <code>int</code> "|" operator) two or more * of those <code>DND</code> effect constants. * </p> * <p> * <dl> * <dt><b>Feedback:</b></dt> * <dd>FEEDBACK_SELECT, FEEDBACK_INSERT_BEFORE, FEEDBACK_INSERT_AFTER, FEEDBACK_EXPAND, FEEDBACK_SCROLL</dd> * </dl> * </p><p> * Note: Only one of the styles FEEDBACK_SELECT, FEEDBACK_INSERT_BEFORE or * FEEDBACK_INSERT_AFTER may be specified. * </p> * * @see DropTargetAdapter * @see DropTargetEvent * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> * * @since 3.3 */ public class TreeDropTargetEffect extends DropTargetEffect { static final int SCROLL_HYSTERESIS = 150; // milli seconds static final int EXPAND_HYSTERESIS = 1000; // milli seconds int currentEffect = DND.FEEDBACK_NONE; TreeItem currentItem; TreeItem insertItem = null; bool insertBefore = false; TreeItem scrollItem; long scrollBeginTime; TreeItem expandItem; long expandBeginTime; // DataBrowserCallbacks callbacks = null; int acceptDragProc(int theControl, int itemID, int property, int theRect, int theDrag) { return (currentEffect & DND.FEEDBACK_SELECT) !is 0 ? 1 : 0; } // static Callback AcceptDragProc; // static { // AcceptDragProc = new Callback(TreeDropTargetEffect.class, "AcceptDragProc", 5); //$NON-NLS-1$ // int acceptDragProc = AcceptDragProc.getAddress(); // if (acceptDragProc is 0) DWT.error(DWT.ERROR_NO_MORE_CALLBACKS); // } // static int AcceptDragProc(int theControl, int itemID, int property, int theRect, int theDrag) { // DropTarget target = FindDropTarget(theControl, theDrag); // if (target is null) return 0; // return (target.feedback & DND.FEEDBACK_SELECT) !is 0 ? 1 : 0; // } // static DropTarget FindDropTarget(int theControl, int theDrag) { // if (theControl is 0) return null; // Display display = Display.findDisplay(Thread.currentThread()); // if (display is null || display.isDisposed()) return null; // Widget widget = display.findWidget(theControl); // if (widget is null) return null; // return (DropTarget)widget.getData(DND.DROP_TARGET_KEY); // } /** * Creates a new <code>TreeDropTargetEffect</code> to handle the drag under effect on the specified * <code>Tree</code>. * * @param tree the <code>Tree</code> over which the user positions the cursor to drop the data */ public TreeDropTargetEffect(Tree tree) { super(tree); } int checkEffect(int effect) { // Some effects are mutually exclusive. Make sure that only one of the mutually exclusive effects has been specified. if ((effect & DND.FEEDBACK_SELECT) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER & ~DND.FEEDBACK_INSERT_BEFORE; if ((effect & DND.FEEDBACK_INSERT_BEFORE) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER; return effect; } /** * This implementation of <code>dragEnter</code> provides a default drag under effect * for the feedback specified in <code>event.feedback</code>. * * For additional information see <code>DropTargetAdapter.dragEnter</code>. * * Subclasses that override this method should call <code>super.dragEnter(event)</code> * to get the default drag under effect implementation. * * @param event the information associated with the drag enter event * * @see DropTargetAdapter * @see DropTargetEvent */ public void dragEnter(DropTargetEvent event) { // if (callbacks is null) { // Tree table = (Tree) control; // DataBrowserCallbacks callbacks = new DataBrowserCallbacks (); // OS.GetDataBrowserCallbacks (table.handle, callbacks); // callbacks.v1_acceptDragCallback = AcceptDragProc.getAddress(); // OS.SetDataBrowserCallbacks(table.handle, callbacks); // } insertItem = null; expandBeginTime = 0; expandItem = null; scrollBeginTime = 0; scrollItem = null; } /** * This implementation of <code>dragLeave</code> provides a default drag under effect * for the feedback specified in <code>event.feedback</code>. * * For additional information see <code>DropTargetAdapter.dragLeave</code>. * * Subclasses that override this method should call <code>super.dragLeave(event)</code> * to get the default drag under effect implementation. * * @param event the information associated with the drag leave event * * @see DropTargetAdapter * @see DropTargetEvent */ public void dragLeave(DropTargetEvent event) { Tree tree = (Tree) control; if (insertItem !is null) { setInsertMark(tree, null, false); insertItem = null; } expandBeginTime = 0; expandItem = null; scrollBeginTime = 0; scrollItem = null; } /** * This implementation of <code>dragOver</code> provides a default drag under effect * for the feedback specified in <code>event.feedback</code>. * * For additional information see <code>DropTargetAdapter.dragOver</code>. * * Subclasses that override this method should call <code>super.dragOver(event)</code> * to get the default drag under effect implementation. * * @param event the information associated with the drag over event * * @see DropTargetAdapter * @see DropTargetEvent * @see DND#FEEDBACK_SELECT * @see DND#FEEDBACK_INSERT_BEFORE * @see DND#FEEDBACK_INSERT_AFTER * @see DND#FEEDBACK_SCROLL */ public void dragOver(DropTargetEvent event) { Tree tree = (Tree) control; TreeItem item = (TreeItem)getItem(tree, event.x, event.y); int effect = checkEffect(event.feedback); if ((effect & DND.FEEDBACK_EXPAND) is 0) { expandBeginTime = 0; expandItem = null; } else { if (item !is null && item.equals(expandItem) && expandBeginTime !is 0) { if (System.currentTimeMillis() >= expandBeginTime) { if (item.getItemCount() > 0 && !item.getExpanded()) { Event e = new Event(); e.x = event.x; e.y = event.y; e.item = item; e.time = (int) System.currentTimeMillis(); tree.notifyListeners(DWT.Expand, e); if (item.isDisposed()) return; item.setExpanded(true); } expandBeginTime = 0; expandItem = null; } } else { expandBeginTime = System.currentTimeMillis() + EXPAND_HYSTERESIS; expandItem = item; } } if ((effect & DND.FEEDBACK_SCROLL) is 0) { scrollBeginTime = 0; scrollItem = null; } else { if (item !is null && item.equals(scrollItem) && scrollBeginTime !is 0) { if (System.currentTimeMillis() >= scrollBeginTime) { Rectangle area = tree.getClientArea(); int headerHeight = tree.getHeaderHeight(); int itemHeight= tree.getItemHeight(); Point pt = new Point(event.x, event.y); pt = tree.getDisplay().map(null, tree, pt); TreeItem nextItem = null; if (pt.y < area.y + headerHeight + 2 * itemHeight) { nextItem = previousItem(tree, item); } if (pt.y > area.y + area.height - 2 * itemHeight) { nextItem = nextItem(tree, item); } if (nextItem !is null) tree.showItem(nextItem); scrollBeginTime = 0; scrollItem = null; } } else { scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS; scrollItem = item; } } if ((effect & DND.FEEDBACK_INSERT_AFTER) !is 0 || (effect & DND.FEEDBACK_INSERT_BEFORE) !is 0) { if (currentItem !is item || ((effect & DND.FEEDBACK_INSERT_AFTER) !is (currentEffect & DND.FEEDBACK_INSERT_AFTER)) || ((effect & DND.FEEDBACK_INSERT_BEFORE) !is (currentEffect & DND.FEEDBACK_INSERT_BEFORE))) { setInsertMark(tree, item, (effect & DND.FEEDBACK_INSERT_BEFORE) !is 0); currentEffect = effect; currentItem = item; } } else { setInsertMark(tree, null, false); } // save current effect for selection feedback ((DropTarget)event.widget).feedback = effect; } void setInsertMark(Tree tree, TreeItem item, bool before) { if (item is insertItem && before is insertBefore) return; insertItem = item; insertBefore = before; tree.setInsertMark(item, before); } }