Mercurial > projects > dwt-linux
view dwt/dnd/TableDropTargetEffect.d @ 259:c0d810de7093
Update SWT 3.4M7 to 3.4
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 29 Jun 2008 14:33:38 +0200 |
parents | ce446666f5a2 |
children |
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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 * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwt.dnd.TableDropTargetEffect; import dwt.graphics.Point; import dwt.internal.gtk.OS; import dwt.widgets.Table; import dwt.dnd.DropTargetEffect; import dwt.dnd.DropTargetEvent; import dwt.dnd.DND; import dwt.dwthelper.System; /** * This class provides a default drag under effect (eg. select, insert and scroll) * when a drag occurs over a <code>Table</code>. * * <p>Classes that wish to provide their own drag under effect for a <code>Table</code> * can extend the <code>TableDropTargetEffect</code> and override any applicable methods * in <code>TableDropTargetEffect</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_SCROLL</dd> * </dl> * </p> * * @see DropTargetAdapter * @see DropTargetEvent * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> * * @since 3.3 */ public class TableDropTargetEffect : DropTargetEffect { static const int SCROLL_HYSTERESIS = 150; // milli seconds int scrollIndex; long scrollBeginTime; /** * Creates a new <code>TableDropTargetEffect</code> to handle the drag under effect on the specified * <code>Table</code>. * * @param table the <code>Table</code> over which the user positions the cursor to drop the data */ public this(Table table) { super(table); } 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 override void dragEnter(DropTargetEvent event) { scrollBeginTime = 0; scrollIndex = -1; } /** * 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 override void dragLeave(DropTargetEvent event) { Table table = cast(Table) control; auto handle = table.handle; OS.gtk_tree_view_set_drag_dest_row(handle, null, OS.GTK_TREE_VIEW_DROP_BEFORE); scrollBeginTime = 0; scrollIndex = -1; } /** * This implementation of <code>dragOver</code> provides a default drag under effect * for the feedback specified in <code>event.feedback</code>. The class description * lists the FEEDBACK constants that are applicable to the class. * * 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_SCROLL */ public override void dragOver(DropTargetEvent event) { Table table = cast(Table) control; auto handle = table.handle; int effect = checkEffect(event.feedback); Point coordinates = new Point(event.x, event.y); coordinates = table.toControl(coordinates); void* path; OS.gtk_tree_view_get_path_at_pos (handle, coordinates.x, coordinates.y, &path, null, null, null); int index = -1; if (path !is null) { auto indices = OS.gtk_tree_path_get_indices (path); if (indices !is null) { index = indices[0]; } } if ((effect & DND.FEEDBACK_SCROLL) is 0) { scrollBeginTime = 0; scrollIndex = -1; } else { if (index !is -1 && scrollIndex is index && scrollBeginTime !is 0) { if (System.currentTimeMillis() >= scrollBeginTime) { if (coordinates.y < table.getItemHeight()) { OS.gtk_tree_path_prev(path); } else { OS.gtk_tree_path_next(path); } if (path !is null) { OS.gtk_tree_view_scroll_to_cell(handle, path, null, false, 0, 0); OS.gtk_tree_path_free(path); path = null; OS.gtk_tree_view_get_path_at_pos (handle, coordinates.x, coordinates.y, &path, null, null, null); } scrollBeginTime = 0; scrollIndex = -1; } } else { scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS; scrollIndex = index; } } if (path !is null) { int position = 0; if ((effect & DND.FEEDBACK_SELECT) !is 0) position = OS.GTK_TREE_VIEW_DROP_INTO_OR_BEFORE; //if ((effect & DND.FEEDBACK_INSERT_BEFORE) !is 0) position = OS.GTK_TREE_VIEW_DROP_BEFORE; //if ((effect & DND.FEEDBACK_INSERT_AFTER) !is 0) position = OS.GTK_TREE_VIEW_DROP_AFTER; if (position !is 0) { OS.gtk_tree_view_set_drag_dest_row(handle, path, OS.GTK_TREE_VIEW_DROP_INTO_OR_BEFORE); } else { OS.gtk_tree_view_set_drag_dest_row(handle, null, OS.GTK_TREE_VIEW_DROP_BEFORE); } } else { OS.gtk_tree_view_set_drag_dest_row(handle, null, OS.GTK_TREE_VIEW_DROP_BEFORE); } if (path !is null) OS.gtk_tree_path_free (path ); } }