/*******************************************************************************
* Copyright (c) 2008, 2015 Angelo Zerr and others.
* 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:
* Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
*******************************************************************************/
package org.eclipse.e4.ui.css.swt.properties;
import org.eclipse.e4.ui.css.core.dom.properties.ICSSPropertyHandler;
import org.eclipse.e4.ui.css.core.engine.CSSEngine;
import org.eclipse.e4.ui.css.swt.helpers.SWTElementHelpers;
import org.eclipse.swt.widgets.Control;
import org.w3c.dom.css.CSSValue;
/**
* Abstract CSS Property SWT Handler to check if the <code>element</code>
* coming from applyCSSProperty and retrieveCSSProperty methods is SWT Control.
*/
public abstract class AbstractCSSPropertySWTHandler implements ICSSPropertyHandler {
@Override
public boolean applyCSSProperty(Object element, String property,
CSSValue value, String pseudo, CSSEngine engine) throws Exception {
Control control = SWTElementHelpers.getControl(element);
if (control != null) {
// The SWT control is retrieved
// the apply CSS property can be done.
this.applyCSSProperty(control, property, value, pseudo, engine);
return true;
}
return false;
}
@Override
public String retrieveCSSProperty(Object element, String property, String pseudo,
CSSEngine engine) throws Exception {
Control control = SWTElementHelpers.getControl(element);
if (control != null) {
// The SWT control is retrieved
// the retrieve CSS property can be done.
return retrieveCSSProperty(control, property, pseudo, engine);
}
return null;
}
/**
* Apply CSS Property <code>property</code> (ex : background-color) with
* CSSValue <code>value</code> (ex : red) into the SWT
* <code>control</code> (ex : SWT Text, SWT Label).
*
* @param control
* @param property
* @param value
* @param pseudo
* @param engine
* @throws Exception
*/
protected abstract void applyCSSProperty(Control control, String property,
CSSValue value, String pseudo, CSSEngine engine) throws Exception;
/**
* Retrieve CSS value (ex : red) of CSS Property <code>property</code> (ex :
* background-color) from the SWT <code>control</code> (ex : SWT Text, SWT
* Label).
*
* @param control
* @param property
* @param engine
* @return
* @throws Exception
*/
protected abstract String retrieveCSSProperty(Control control,
String property, String pseudo, CSSEngine engine) throws Exception;
}