/**
* Copyright (c) 2014 - 2017 Frank Appel
* 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:
* Frank Appel - initial API and implementation
*/
package com.codeaffine.eclipse.swt.widget.scrollable.context;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Scrollable;
class EnablementReconciliation {
private final ScrollableControl<? extends Scrollable> scrollable;
private final Composite adapter;
boolean scrollableEnabled;
boolean adapterEnabled;
EnablementReconciliation( Composite adapter, ScrollableControl<? extends Scrollable> scrollable ) {
this.adapter = adapter;
this.scrollable = scrollable;
this.scrollableEnabled = scrollable.getEnabled();
}
void run() {
scrollableEnabled = scrollable.getEnabled();
if( adapter.getEnabled() != scrollableEnabled ) {
adapter.setEnabled( scrollableEnabled );
}
if( scrollableEnabled && adapterEnabled != adapter.isEnabled() ) {
adapter.setEnabled( scrollableEnabled );
adapterEnabled = adapter.isEnabled();
}
}
boolean setEnabled( boolean enabled ) {
boolean result = enabled;
if( enableAdapter( enabled ) && enableScrollable() ) {
result = true;
} else if( enableAdapter( enabled ) && disableScrollable() ) {
result = false;
} else if( disableAdapter( enabled ) && enableScrollable() ) {
result = true;
} else if( disableAdapter( enabled ) && disableScrollable() ) {
result = false;
}
scrollable.setEnabled( result );
scrollableEnabled = scrollable.getEnabled();
adapterEnabled = adapter.isEnabled();
return result;
}
private boolean enableAdapter( boolean enabled ) {
return !adapter.getEnabled() && enabled;
}
private boolean disableAdapter( boolean enabled ) {
return adapter.getEnabled() && !enabled;
}
private boolean enableScrollable() {
return !scrollableEnabled && scrollable.getEnabled() ;
}
private boolean disableScrollable() {
return scrollableEnabled && !scrollable.getEnabled() ;
}
}