| /******************************************************************************* |
| * Copyright (c) 2010 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.e4.ui.workbench.renderers.swt; |
| |
| import org.eclipse.e4.core.contexts.IEclipseContext; |
| import org.eclipse.e4.ui.services.IStylingEngine; |
| import org.eclipse.swt.widgets.Control; |
| import org.w3c.dom.css.CSSPrimitiveValue; |
| import org.w3c.dom.css.CSSStyleDeclaration; |
| import org.w3c.dom.css.CSSValue; |
| |
| /** |
| * Helper class for retrieving CSS values for a particular control so it can be |
| * used by renderers. |
| */ |
| public class CSSEngineHelper { |
| IEclipseContext context; |
| Control control; |
| IStylingEngine engine; |
| CSSStyleDeclaration style; |
| |
| /** |
| * Create a CSSEngineHelper that can retrieve engine values for a particular |
| * control. |
| * |
| * @param context |
| * @param control |
| */ |
| public CSSEngineHelper(IEclipseContext context, Control control) { |
| this.context = context; |
| this.control = control; |
| initialize(); |
| } |
| |
| private void initialize() { |
| this.engine = context.get(IStylingEngine.class); |
| if (engine != null) { |
| style = engine.getStyle(control); |
| } |
| } |
| |
| /** |
| * Return the margin bottom as specified in the stylesheet for this control, |
| * or the defaultValue if none is specified. |
| * |
| * @param defaultValue |
| * @return the margin in pixels |
| */ |
| public int getMarginBottom(int defaultValue) { |
| if (style == null) |
| return defaultValue; |
| return getPxValue( |
| style.getPropertyCSSValue("margin-bottom"), defaultValue); //$NON-NLS-1$ |
| } |
| |
| /** |
| * Return the margin top as specified in the stylesheet for this control, or |
| * the defaultValue if none is specified. |
| * |
| * @param defaultValue |
| * @return the margin in pixels |
| */ |
| public int getMarginTop(int defaultValue) { |
| if (style == null) |
| return defaultValue; |
| return getPxValue(style.getPropertyCSSValue("margin-top"), defaultValue); //$NON-NLS-1$ |
| } |
| |
| /** |
| * Return the margin left as specified in the stylesheet for this control, |
| * or the defaultValue if none is specified. |
| * |
| * @param defaultValue |
| * @return the margin in pixels |
| */ |
| public int getMarginLeft(int defaultValue) { |
| if (style == null) |
| return defaultValue; |
| return getPxValue( |
| style.getPropertyCSSValue("margin-left"), defaultValue); //$NON-NLS-1$ |
| } |
| |
| /** |
| * Return the margin right as specified in the stylesheet for this control, |
| * or the defaultValue if none is specified. |
| * |
| * @param defaultValue |
| * @return the margin in pixels |
| */ |
| public int getMarginRight(int defaultValue) { |
| if (style == null) |
| return defaultValue; |
| return getPxValue( |
| style.getPropertyCSSValue("margin-right"), defaultValue); //$NON-NLS-1$ |
| } |
| |
| private int getPxValue(CSSValue value, int defaultValue) { |
| if (value != null |
| && (value.getCssValueType() == CSSValue.CSS_PRIMITIVE_VALUE) |
| && (((CSSPrimitiveValue) value).getPrimitiveType() == CSSPrimitiveValue.CSS_PX)) { |
| return (int) ((CSSPrimitiveValue) value) |
| .getFloatValue(CSSPrimitiveValue.CSS_PX); |
| } |
| return defaultValue; |
| } |
| } |