SVGTextContentElement.cpp revision 81bc750723a18f21cd17d1b173cd2a4dda9cea6e 
1/*
2 * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005, 2006, 2007, 2008 Rob Buis <buis@kde.org>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB.  If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21#include "config.h"
22
23#if ENABLE(SVG)
24#include "SVGTextContentElement.h"
25
26#include "CSSPropertyNames.h"
27#include "CSSValueKeywords.h"
28#include "Frame.h"
29#include "RenderObject.h"
30#include "SVGDocumentExtensions.h"
31#include "SVGNames.h"
32#include "SVGTextQuery.h"
33#include "SelectionController.h"
34#include "XMLNames.h"
35
36namespace WebCore {
37
38// Animated property definitions
39DEFINE_ANIMATED_LENGTH(SVGTextContentElement, SVGNames::textLengthAttr, TextLength, textLength)
40DEFINE_ANIMATED_ENUMERATION(SVGTextContentElement, SVGNames::lengthAdjustAttr, LengthAdjust, lengthAdjust)
41DEFINE_ANIMATED_BOOLEAN(SVGTextContentElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
42
43SVGTextContentElement::SVGTextContentElement(const QualifiedName& tagName, Document* document)
44    : SVGStyledElement(tagName, document)
45    , m_textLength(LengthModeOther)
46    , m_lengthAdjust(LENGTHADJUST_SPACING)
47{
48}
49
50unsigned SVGTextContentElement::getNumberOfChars() const
51{
52    document()->updateLayoutIgnorePendingStylesheets();
53    return SVGTextQuery(renderer()).numberOfCharacters();
54}
55
56float SVGTextContentElement::getComputedTextLength() const
57{
58    document()->updateLayoutIgnorePendingStylesheets();
59    return SVGTextQuery(renderer()).textLength();
60}
61
62float SVGTextContentElement::getSubStringLength(unsigned charnum, unsigned nchars, ExceptionCode& ec) const
63{
64    document()->updateLayoutIgnorePendingStylesheets();
65
66    unsigned numberOfChars = getNumberOfChars();
67    if (charnum >= numberOfChars) {
68        ec = INDEX_SIZE_ERR;
69        return 0.0f;
70    }
71
72    return SVGTextQuery(renderer()).subStringLength(charnum, nchars);
73}
74
75FloatPoint SVGTextContentElement::getStartPositionOfChar(unsigned charnum, ExceptionCode& ec) const
76{
77    document()->updateLayoutIgnorePendingStylesheets();
78
79    if (charnum > getNumberOfChars()) {
80        ec = INDEX_SIZE_ERR;
81        return FloatPoint();
82    }
83
84    return SVGTextQuery(renderer()).startPositionOfCharacter(charnum);
85}
86
87FloatPoint SVGTextContentElement::getEndPositionOfChar(unsigned charnum, ExceptionCode& ec) const
88{
89    document()->updateLayoutIgnorePendingStylesheets();
90
91    if (charnum > getNumberOfChars()) {
92        ec = INDEX_SIZE_ERR;
93        return FloatPoint();
94    }
95
96    return SVGTextQuery(renderer()).endPositionOfCharacter(charnum);
97}
98
99FloatRect SVGTextContentElement::getExtentOfChar(unsigned charnum, ExceptionCode& ec) const
100{
101    document()->updateLayoutIgnorePendingStylesheets();
102
103    if (charnum > getNumberOfChars()) {
104        ec = INDEX_SIZE_ERR;
105        return FloatRect();
106    }
107
108    return SVGTextQuery(renderer()).extentOfCharacter(charnum);
109}
110
111float SVGTextContentElement::getRotationOfChar(unsigned charnum, ExceptionCode& ec) const
112{
113    document()->updateLayoutIgnorePendingStylesheets();
114
115    if (charnum > getNumberOfChars()) {
116        ec = INDEX_SIZE_ERR;
117        return 0.0f;
118    }
119
120    return SVGTextQuery(renderer()).rotationOfCharacter(charnum);
121}
122
123int SVGTextContentElement::getCharNumAtPosition(const FloatPoint& point) const
124{
125    document()->updateLayoutIgnorePendingStylesheets();
126    return SVGTextQuery(renderer()).characterNumberAtPosition(point);
127}
128
129void SVGTextContentElement::selectSubString(unsigned charnum, unsigned nchars, ExceptionCode& ec) const
130{
131    unsigned numberOfChars = getNumberOfChars();
132    if (charnum >= numberOfChars) {
133        ec = INDEX_SIZE_ERR;
134        return;
135    }
136
137    if (nchars > numberOfChars - charnum)
138        nchars = numberOfChars - charnum;
139
140    ASSERT(document());
141    ASSERT(document()->frame());
142
143    SelectionController* controller = document()->frame()->selection();
144    if (!controller)
145        return;
146
147    // Find selection start
148    VisiblePosition start(firstPositionInNode(const_cast<SVGTextContentElement*>(this)));
149    for (unsigned i = 0; i < charnum; ++i)
150        start = start.next();
151
152    // Find selection end
153    VisiblePosition end(start);
154    for (unsigned i = 0; i < nchars; ++i)
155        end = end.next();
156
157    controller->setSelection(VisibleSelection(start, end));
158}
159
160void SVGTextContentElement::parseMappedAttribute(Attribute* attr)
161{
162    if (attr->name() == SVGNames::lengthAdjustAttr) {
163        if (attr->value() == "spacing")
164            setLengthAdjustBaseValue(LENGTHADJUST_SPACING);
165        else if (attr->value() == "spacingAndGlyphs")
166            setLengthAdjustBaseValue(LENGTHADJUST_SPACINGANDGLYPHS);
167    } else if (attr->name() == SVGNames::textLengthAttr) {
168        setTextLengthBaseValue(SVGLength(LengthModeOther, attr->value()));
169        if (textLengthBaseValue().value(this) < 0.0)
170            document()->accessSVGExtensions()->reportError("A negative value for text attribute <textLength> is not allowed");
171    } else {
172        if (SVGTests::parseMappedAttribute(attr))
173            return;
174        if (SVGLangSpace::parseMappedAttribute(attr)) {
175            if (attr->name().matches(XMLNames::spaceAttr)) {
176                DEFINE_STATIC_LOCAL(const AtomicString, preserveString, ("preserve"));
177
178                if (attr->value() == preserveString)
179                    addCSSProperty(attr, CSSPropertyWhiteSpace, CSSValuePre);
180                else
181                    addCSSProperty(attr, CSSPropertyWhiteSpace, CSSValueNowrap);
182            }
183            return;
184        }
185        if (SVGExternalResourcesRequired::parseMappedAttribute(attr))
186            return;
187
188        SVGStyledElement::parseMappedAttribute(attr);
189    }
190}
191
192void SVGTextContentElement::synchronizeProperty(const QualifiedName& attrName)
193{
194    SVGStyledElement::synchronizeProperty(attrName);
195
196    if (attrName == anyQName()) {
197        synchronizeLengthAdjust();
198        synchronizeTextLength();
199        synchronizeExternalResourcesRequired();
200        SVGTests::synchronizeProperties(this, attrName);
201        return;
202    }
203
204    if (attrName == SVGNames::lengthAdjustAttr)
205        synchronizeLengthAdjust();
206    else if (attrName == SVGNames::textLengthAttr)
207        synchronizeTextLength();
208    else if (SVGExternalResourcesRequired::isKnownAttribute(attrName))
209        synchronizeExternalResourcesRequired();
210    else if (SVGTests::isKnownAttribute(attrName))
211        SVGTests::synchronizeProperties(this, attrName);
212}
213
214void SVGTextContentElement::svgAttributeChanged(const QualifiedName& attrName)
215{
216    SVGStyledElement::svgAttributeChanged(attrName);
217
218    if (SVGTests::handleAttributeChange(this, attrName))
219        return;
220
221    // FIXME: also handle attribute changes for lengthAdjust and textLength
222}
223
224void SVGTextContentElement::fillPassedAttributeToPropertyTypeMap(AttributeToPropertyTypeMap& attributeToPropertyTypeMap)
225{
226    SVGStyledElement::fillPassedAttributeToPropertyTypeMap(attributeToPropertyTypeMap);
227
228    attributeToPropertyTypeMap.set(SVGNames::textLengthAttr, AnimatedLength);
229    attributeToPropertyTypeMap.set(SVGNames::lengthAdjustAttr, AnimatedEnumeration);
230}
231
232bool SVGTextContentElement::isKnownAttribute(const QualifiedName& attrName)
233{
234    return attrName.matches(SVGNames::lengthAdjustAttr)
235            || attrName.matches(SVGNames::textLengthAttr)
236            || SVGLangSpace::isKnownAttribute(attrName)
237            || SVGExternalResourcesRequired::isKnownAttribute(attrName)
238            || SVGStyledElement::isKnownAttribute(attrName);
239}
240
241bool SVGTextContentElement::selfHasRelativeLengths() const
242{
243    // Any element of the <text> subtree is advertized as using relative lengths.
244    // On any window size change, we have to relayout the text subtree, as the
245    // effective 'on-screen' font size may change.
246    return true;
247}
248
249SVGTextContentElement* SVGTextContentElement::elementFromRenderer(RenderObject* renderer)
250{
251    if (!renderer)
252        return 0;
253
254    if (!renderer->isSVGText() && !renderer->isSVGInline())
255        return 0;
256
257    Node* node = renderer->node();
258    ASSERT(node);
259    ASSERT(node->isSVGElement());
260
261    if (!node->hasTagName(SVGNames::textTag)
262        && !node->hasTagName(SVGNames::tspanTag)
263#if ENABLE(SVG_FONTS)
264        && !node->hasTagName(SVGNames::altGlyphTag)
265#endif
266        && !node->hasTagName(SVGNames::trefTag)
267        && !node->hasTagName(SVGNames::textPathTag))
268        return 0;
269
270    return static_cast<SVGTextContentElement*>(node);
271}
272
273}
274
275#endif // ENABLE(SVG)
276