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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.*;
import org.eclipse.swt.graphics.*;
public abstract class Scrollable extends Control {
int scrolledHandle /* formHandle */;
int hScrollBar, vScrollBar;
ScrollBar horizontalBar, verticalBar;
Scrollable () {
/* Do nothing */
}
public Scrollable (Composite parent, int style) {
super (parent, style);
}
public Rectangle computeTrim (int x, int y, int width, int height) {
checkWidget();
return new Rectangle (0, 0, 0, 0);
}
ScrollBar createScrollBar (int type) {
return new ScrollBar (this, type);
}
void createWidget (int index) {
super.createWidget (index);
if ((style & SWT.H_SCROLL) != 0) horizontalBar = createScrollBar (SWT.H_SCROLL);
if ((style & SWT.V_SCROLL) != 0) verticalBar = createScrollBar (SWT.V_SCROLL);
}
void deregister () {
super.deregister ();
if (scrolledHandle != 0) WidgetTable.remove (scrolledHandle);
}
public Rectangle getClientArea () {
checkWidget();
return new Rectangle (0, 0, 0, 0);
}
public ScrollBar getHorizontalBar () {
checkWidget();
return horizontalBar;
}
public ScrollBar getVerticalBar () {
checkWidget();
return verticalBar;
}
void register () {
super.register ();
if (scrolledHandle != 0) WidgetTable.put (scrolledHandle, this);
}
void releaseHandle () {
super.releaseHandle ();
scrolledHandle = 0;
}
void releaseWidget () {
if (horizontalBar != null) {
horizontalBar.releaseWidget ();
horizontalBar.releaseHandle ();
}
if (verticalBar != null) {
verticalBar.releaseWidget ();
verticalBar.releaseHandle ();
}
horizontalBar = verticalBar = null;
super.releaseWidget ();
}
}
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