| /******************************************************************************* |
| * 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 org.eclipse.swt.widgets; |
| |
| import org.eclipse.swt.internal.carbon.*; |
| |
| |
| class WidgetTable { |
| static int FreeSlot = 0; |
| static int GrowSize = 1024; |
| static int [] IndexTable = new int [GrowSize]; |
| static Widget [] WidgetTable = new Widget [GrowSize]; |
| static final int SWT0 = ('s'<<24) + ('w'<<16) + ('t'<<8) + '0'; |
| static int [] Property = new int [1]; |
| static { |
| for (int i=0; i<GrowSize-1; i++) IndexTable [i] = i + 1; |
| IndexTable [GrowSize - 1] = -1; |
| } |
| |
| public static synchronized Widget get (int handle) { |
| if (handle == 0) return null; |
| Property [0] = 0; |
| OS.GetControlProperty (handle, SWT0, SWT0, 4, null, Property); |
| int index = Property [0] - 1; |
| if (0 <= index && index < WidgetTable.length) return WidgetTable [index]; |
| return null; |
| } |
| |
| public synchronized static void put (int handle, Widget widget) { |
| if (handle == 0) return; |
| if (FreeSlot == -1) { |
| int length = (FreeSlot = IndexTable.length) + GrowSize; |
| int [] newIndexTable = new int [length]; |
| Widget [] newWidgetTable = new Widget [length]; |
| System.arraycopy (IndexTable, 0, newIndexTable, 0, FreeSlot); |
| System.arraycopy (WidgetTable, 0, newWidgetTable, 0, FreeSlot); |
| for (int i=FreeSlot; i<length-1; i++) { |
| newIndexTable [i] = i + 1; |
| } |
| newIndexTable [length - 1] = -1; |
| IndexTable = newIndexTable; |
| WidgetTable = newWidgetTable; |
| } |
| Property [0] = FreeSlot + 1; |
| OS.SetControlProperty (handle, SWT0, SWT0, 4, Property); |
| int oldSlot = FreeSlot; |
| FreeSlot = IndexTable [oldSlot]; |
| IndexTable [oldSlot] = -2; |
| WidgetTable [oldSlot] = widget; |
| } |
| |
| public static synchronized Widget remove (int handle) { |
| if (handle == 0) return null; |
| Widget widget = null; |
| Property [0] = 0; |
| OS.GetControlProperty (handle, SWT0, SWT0, 4, null, Property); |
| int index = Property [0] - 1; |
| if (0 <= index && index < WidgetTable.length) { |
| widget = WidgetTable [index]; |
| WidgetTable [index] = null; |
| IndexTable [index] = FreeSlot; |
| FreeSlot = index; |
| OS.RemoveControlProperty (handle, SWT0, SWT0); |
| |
| } |
| return widget; |
| } |
| |
| public static synchronized Shell [] shells () { |
| int length = 0; |
| for (int i=0; i<WidgetTable.length; i++) { |
| Widget widget = WidgetTable [i]; |
| if (widget != null && widget instanceof Shell) length++; |
| } |
| int index = 0; |
| Shell [] result = new Shell [length]; |
| for (int i=0; i<WidgetTable.length; i++) { |
| Widget widget = WidgetTable [i]; |
| if (widget != null && widget instanceof Shell) { |
| int j = 0; |
| while (j < index) { |
| if (result [j] == widget) break; |
| j++; |
| } |
| if (j == index) result [index++] = (Shell) widget; |
| } |
| } |
| if (index == length) return result; |
| Shell [] newResult = new Shell [index]; |
| System.arraycopy (result, 0, newResult, 0, index); |
| return newResult; |
| } |
| |
| public static synchronized int size () { |
| int length = 0; |
| for (int i=0; i<WidgetTable.length; i++) { |
| if (WidgetTable [i] != null) length++; |
| } |
| return length; |
| } |
| } |