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package org.eclipse.swt.widgets;
/*
* 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
*/
import org.eclipse.swt.internal.photon.*;
class WidgetTable {
static int FreeSlot = 0;
static int GrowSize = 1024;
static int [] IndexTable = new int [GrowSize];
static Widget [] WidgetTable = new Widget [GrowSize];
static int ArgPtr = OS.malloc (4);
static int [] ArgBuffer = new int [1];
static int [] GetArgs = new int [] {OS.Pt_ARG_USER_DATA, 0, 0};
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;
GetArgs [1] = 0;
OS.PtGetResources (handle, GetArgs.length / 3, GetArgs);
if (GetArgs [1] == 0) return null;
OS.memmove (ArgBuffer, GetArgs [1], 4);
if (ArgBuffer [0] == 0) return null;
int index = ArgBuffer [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;
}
ArgBuffer [0] = FreeSlot + 1;
OS.memmove (ArgPtr, ArgBuffer, 4);
OS.PtSetResource (handle, OS.Pt_ARG_USER_DATA, ArgPtr, 4);
int oldSlot = FreeSlot;
FreeSlot = IndexTable[oldSlot];
IndexTable [oldSlot] = -2;
WidgetTable [oldSlot] = widget;
}
public static synchronized Widget remove (int handle) {
if (handle == 0) return null;
GetArgs [1] = 0;
OS.PtGetResources (handle, GetArgs.length / 3, GetArgs);
if (GetArgs [1] == 0) return null;
OS.memmove (ArgBuffer, GetArgs [1], 4);
if (ArgBuffer [0] == 0) return null;
int index = ArgBuffer [0] - 1;
Widget widget = null;
if (0 <= index && index < WidgetTable.length) {
widget = WidgetTable [index];
WidgetTable [index] = null;
IndexTable [index] = FreeSlot;
FreeSlot = index;
ArgBuffer [0] = 0;
OS.memmove (ArgPtr, ArgBuffer, 4);
OS.PtSetResource (handle, OS.Pt_ARG_USER_DATA, ArgPtr, 4);
}
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) {
result [index++] = (Shell) widget;
}
}
return result;
}
public static synchronized int size () {
int size = 0;
for (int i=0; i<WidgetTable.length; i++) {
if (WidgetTable [i] != null) size++;
}
return size;
}
}
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