1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*****************************************************************************
* Copyright (c) 2012 CEA LIST.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.infra.gmfdiag.css.helper;
import java.io.IOException;
import org.eclipse.gmf.runtime.notation.GradientStyle;
import org.eclipse.gmf.runtime.notation.NotationPackage;
import org.eclipse.gmf.runtime.notation.datatype.GradientData;
import org.eclipse.papyrus.infra.gmfdiag.css.converters.ColorToGMFConverter;
import org.eclipse.papyrus.infra.gmfdiag.css.engine.ExtendedCSSEngine;
import org.w3c.dom.css.CSSValue;
/**
* A Helper class for manipulating CSS Gradient properties.
*
* Gradient properties:
*
* - fillColor
* - gradientColor
* - gradientStyle
* - gradient (Composite property)
*
* The support is currently incomplete, especially when using both the
* composite property and the single ones in CSS files.
*
* @author Camille Letavernier
*/
@SuppressWarnings("restriction")
public class GradientHelper {
/**
* The CSS Value for a Vertical gradient
*/
public static final String GRADIENT_VERTICAL = "vertical";
/**
* The CSS Value for a Horizontal gradient
*/
public static final String GRADIENT_HORIZONTAL = "horizontal";
// Type 1 :
// gradientColor:#ABCDEF;
// gradientStyle:vertical;
// Type 2 :
// (gradient:#FEDCBA #ABCDEF horizontal;) //Currently not supported, as diagrams usually seek for #fillColor()
// gradient:#ABCDEF horizontal;
// gradient:#ABCDEF
// gradient:horizontal
// TODO: The Engine should provide a method to handle complex composite properties.
// The base CSS Engine provides such a feature. However, it is not powerful enough.
/**
* Returns a GradientData from the CSS "gradient", "gradientColor" and/or
* "gradientStyle" properties
*
* @param engine
* The engine used to retrieve the gradient
* @param node
* The semantic node for which the gradient should be retrieved
* (Probably a GMF View, FillStyle...)
* @return
* The computed GradientData, or the default GMF GradientData
* if the stylesheet doesn't specify a Gradient
*/
public static GradientData computeGradient(ExtendedCSSEngine engine, Object node) {
// Type 1
CSSValue gradientColor = engine.retrievePropertyValue(node, "gradientColor");
CSSValue gradientStyle = engine.retrievePropertyValue(node, "gradientStyle");
if (gradientColor != null || gradientStyle != null) {
int color1 = (Integer) engine.convert(gradientColor, ColorToGMFConverter.GMFColor, null);
int style = getGradientStyle(gradientStyle.getCssText());
GradientData gradientData = new GradientData();
gradientData.setGradientColor1(color1);
gradientData.setGradientStyle(style);
return gradientData;
}
// Type 2
CSSValue gradient = engine.retrievePropertyValue(node, "gradient");
if (gradient != null) {
String gradientString = gradient.getCssText();
if (StringHelper.equals(gradientString, "none")) {
return null;
}
int[] gradientValues = parseGradient(engine, gradient);
return new GradientData(gradientValues[0], gradientValues[1], gradientValues[2]);
}
// Default
return (GradientData) NotationPackage.eINSTANCE.getFillStyle_Gradient().getDefaultValue();
}
/** [color1, color2, style] */
private static int[] parseGradient(ExtendedCSSEngine engine, CSSValue gradient) {
String color1, color2, style;
color1 = color2 = style = null;
String[] values = ParserHelper.parseValues(engine, gradient);
if (values.length == 3) {
color1 = values[0];
color2 = values[1];
style = values[2];
} else if (values.length == 2) {
color1 = values[0];
String value = values[1];
if (isGradientStyle(value)) {
style = value;
} else {
color2 = value;
}
} else if (values.length == 1) {
String value = values[0];
if (isGradientStyle(value)) {
style = value;
} else {
color1 = value;
}
}
return parseGradient(engine, color1, color2, style);
}
private static int[] parseGradient(ExtendedCSSEngine engine, String sColor1, String sColor2, String sStyle) {
int color1, color2, style;
color1 = color2 = style = -1;
CSSValue cssColor1, cssColor2;
try {
if (sColor1 != null) {
cssColor1 = engine.parsePropertyValue(sColor1);
color1 = (Integer) engine.convert(cssColor1, ColorToGMFConverter.GMFColor, null);
}
if (sColor2 != null) {
cssColor2 = engine.parsePropertyValue(sColor2);
color2 = (Integer) engine.convert(cssColor2, ColorToGMFConverter.GMFColor, null); // Unused
}
style = getGradientStyle(sStyle);
} catch (IOException ex) {
engine.handleExceptions(ex);
}
return new int[] { color1, color2, style };
}
private static boolean isGradientStyle(String value) {
return StringHelper.equals(GRADIENT_VERTICAL, value) || StringHelper.equals(GRADIENT_HORIZONTAL, value);
}
private static int getGradientStyle(String gradientStyle) {
if (StringHelper.equals(GRADIENT_VERTICAL, gradientStyle)) {
return GradientStyle.VERTICAL;
} else if (StringHelper.equals(GRADIENT_HORIZONTAL, gradientStyle)) {
return GradientStyle.HORIZONTAL;
}
// Default value
return new GradientData().getGradientStyle();
}
}
|
