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package org.eclipse.swt.widgets;
import org.eclipse.swt.internal.carbon.*;
/*
* Copyright (c) 2000, 2002 IBM Corp. All rights reserved.
* This file is 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
*/
public 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 count = 0;
for (int i= 0; i < WidgetTable.length; i++) {
if (WidgetTable[i] instanceof Shell) count++;
}
int index= 0;
Shell [] result = new Shell [count];
for (int i= 0; i < WidgetTable.length; i++) {
Widget widget = WidgetTable [i];
if (widget != null && widget instanceof Shell) {
result [index++]= (Shell) widget;
}
}
return result;
}
public static synchronized int size () {
int length = 0;
for (int i=0; i<WidgetTable.length; i++) {
if (WidgetTable [i] != null) length++;
}
return length;
}
}
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