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/*******************************************************************************
* Copyright (c) 2009, 2014 EclipseSource and others.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which accompanies this distribution,
t https://www.eclipse.org/legal/epl-2.0/
t
t SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* EclipseSource - initial API and implementation
* Lars Vogel <Lars.Vogel@gmail.com> - Bug 430468
* Stefan Winkler <stefan@winklerweb.net> - Bug 458342
******************************************************************************/
package org.eclipse.e4.ui.tests.css.core.parser;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.io.IOException;
import org.eclipse.e4.ui.css.core.impl.dom.DocumentCSSImpl;
import org.eclipse.e4.ui.css.core.impl.dom.ViewCSSImpl;
import org.eclipse.e4.ui.css.swt.engine.CSSSWTEngineImpl;
import org.eclipse.e4.ui.tests.css.core.util.ParserTestUtil;
import org.eclipse.e4.ui.tests.css.core.util.TestElement;
import org.eclipse.swt.widgets.Display;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.w3c.dom.css.CSSStyleDeclaration;
import org.w3c.dom.css.CSSStyleSheet;
import org.w3c.dom.css.ViewCSS;
/**
* Test to ensure the that CSS honors the CSS cascading rules, i.e.:
*
* <p>
* !important after CSS properties.
* </p>
* <p>
* Specificity of CSS rule selectors
* </p>
* <p>
* Sequence of declaration.
* </p>
*
**/
public class CascadeTest {
private Display display;
private CSSSWTEngineImpl engine;
@BeforeEach
public void setUp() throws Exception {
display = Display.getDefault();
engine = new CSSSWTEngineImpl(display);
}
@Test
public void testPosition() throws Exception {
// Two rules with the same specificity, the second rule should take
// precedence because of its position in the stylesheet
String css = "Button { color: blue; font-weight: bold; }\n"
+ "Button { color: black }\n";
ViewCSS viewCSS = createViewCss(css);
TestElement button = new TestElement("Button", engine);
CSSStyleDeclaration style = viewCSS.getComputedStyle(button, null);
assertEquals("black", style.getPropertyCSSValue("color").getCssText());
assertEquals("bold", style.getPropertyCSSValue("font-weight").getCssText());
}
@Test
public void testSpecificity() throws Exception {
// Two rules with different specificity, the first should take
// precedence because of its higher specificity
String css = "Label, Button.special { color: black; }\n"
+ "Button { color: blue; font-weight: bold; }\n";
ViewCSS viewCSS = createViewCss(css);
TestElement button = new TestElement("Button", engine);
CSSStyleDeclaration style = viewCSS.getComputedStyle(button, null);
assertEquals("blue", style.getPropertyCSSValue("color").getCssText());
button.setClass("special");
style = viewCSS.getComputedStyle(button, null);
assertEquals("black", style.getPropertyCSSValue("color").getCssText());
assertEquals("bold", style.getPropertyCSSValue("font-weight")
.getCssText());
}
@Test
public void ensureThatClassAndIdareConsideredIfOnTheSameLevel() throws Exception {
// Rules for elements with children. The first should take
// precedence because of its higher specificity
String css = "CTabFolder > Composite > Toolbar { color: black; }\n"
+ "CTabFolder > Composite > .special { color: blue; font-weight: bold; }\n"
+ "CTabFolder > Composite > #special { color: red; font-weight: bold; }\n";
ViewCSS viewCSS = createViewCss(css);
TestElement tabFolder = new TestElement("CTabFolder", engine);
TestElement composite = new TestElement("Composite", tabFolder, engine);
TestElement toolbar = new TestElement("Toolbar", composite, engine);
CSSStyleDeclaration style = viewCSS.getComputedStyle(toolbar, null);
assertEquals("black", style.getPropertyCSSValue("color").getCssText());
toolbar.setClass("special");
style = viewCSS.getComputedStyle(toolbar, null);
assertEquals("blue", style.getPropertyCSSValue("color").getCssText());
toolbar.setId("special");
style = viewCSS.getComputedStyle(toolbar, null);
assertEquals("red", style.getPropertyCSSValue("color").getCssText());
}
@Test
public void testSpecificities() throws Exception {
// Different specificities
String css = "* { color: black; }\n"
+ "Button { color: blue; }\n"
+ "Button[BORDER] { color: gray; }\n"
+ "Button.special { color: green; }\n"
+ "Button#myid { color: red; }\n";
ViewCSS viewCSS = createViewCss(css);
TestElement label = new TestElement("Label", engine);
CSSStyleDeclaration style = viewCSS.getComputedStyle(label, null);
assertEquals("black", style.getPropertyCSSValue("color").getCssText());
TestElement button = new TestElement("Button", engine);
style = viewCSS.getComputedStyle(button, null);
assertEquals("blue", style.getPropertyCSSValue("color").getCssText());
button.setAttribute("BORDER", "true");
style = viewCSS.getComputedStyle(button, null);
assertEquals("gray", style.getPropertyCSSValue("color").getCssText());
button.setClass("special");
style = viewCSS.getComputedStyle(button, null);
assertEquals("green", style.getPropertyCSSValue("color").getCssText());
button.setId("myid");
style = viewCSS.getComputedStyle(button, null);
assertEquals("red", style.getPropertyCSSValue("color").getCssText());
}
private static ViewCSS createViewCss(String... css) throws IOException {
DocumentCSSImpl docCss = new DocumentCSSImpl();
for (String cssString : css) {
CSSStyleSheet styleSheet = ParserTestUtil.parseCss(cssString);
docCss.addStyleSheet(styleSheet);
}
return new ViewCSSImpl(docCss);
}
// public void testImportantRule() throws Exception {
// //Several rules for the same class, if one rule has ! important
// //it takes precedence over all other, if more than one
// //last one gets precedence
//
// String css = "Button{color:red ! important;}\n"
// +"Button{ color: blue ! important;}\n"
// + "Button { color: black }\n";
// ViewCSS viewCSS = createViewCss(css);
//
// TestElement button = new TestElement("Button", engine);
// CSSStyleDeclaration style = viewCSS.getComputedStyle(button, null);
// assertEquals("blue", style.getPropertyCSSValue("color").getCssText());
// }
@Test
public void testBug261081() throws Exception{
// Two rules with the same specificity, the second rule should take
// precedence because of its position in the stylesheet
String css = "Button, Label { color: blue; font-weight: bold; }\n"
+ "Button { color: black }\n";
ViewCSS viewCSS = createViewCss(css);
TestElement button = new TestElement("Button", engine);
CSSStyleDeclaration style = viewCSS.getComputedStyle(button, null);
assertEquals("black", style.getPropertyCSSValue("color").getCssText());
assertEquals("bold", style.getPropertyCSSValue("font-weight").getCssText());
}
@Test
public void testBug458342_combine() throws Exception {
// the rules of two stylesheets should be combined
String css1 = "Button { color: blue; }";
String css2 = "Button { font-weight: bold; }";
ViewCSS viewCSS = createViewCss(css1, css2);
TestElement button = new TestElement("Button", engine);
CSSStyleDeclaration style = viewCSS.getComputedStyle(button, null);
assertEquals("blue", style.getPropertyCSSValue("color").getCssText());
assertEquals("bold", style.getPropertyCSSValue("font-weight").getCssText());
}
@Test
public void testBug458342_override() throws Exception {
// in case of two stylesheets, the second one should override properties
// from the first one
String css1 = "Button { color: blue; font-weight: bold; }";
String css2 = "Button { color: black; }";
ViewCSS viewCSS = createViewCss(css1, css2);
TestElement button = new TestElement("Button", engine);
CSSStyleDeclaration style = viewCSS.getComputedStyle(button, null);
assertEquals("black", style.getPropertyCSSValue("color").getCssText());
assertEquals("bold", style.getPropertyCSSValue("font-weight").getCssText());
}
}
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