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| 1 /* | |
| 2 * Copyright (C) 2014 Robert Hogan <robhogan@chromium.org>. | |
| 3 * | |
| 4 * This library is free software; you can redistribute it and/or | |
| 5 * modify it under the terms of the GNU Library General Public | |
| 6 * License as published by the Free Software Foundation; either | |
| 7 * version 2 of the License, or (at your option) any later version. | |
| 8 * | |
| 9 * This library is distributed in the hope that it will be useful, | |
| 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 * Library General Public License for more details. | |
| 13 * | |
| 14 * You should have received a copy of the GNU Library General Public License | |
| 15 * along with this library; see the file COPYING.LIB. If not, write to | |
| 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
| 17 * Boston, MA 02110-1301, USA. | |
| 18 * | |
| 19 */ | |
| 20 | |
| 21 #include "config.h" | |
| 22 #include "core/html/HTMLImageFallbackHelper.h" | |
| 23 | |
| 24 #include "core/HTMLNames.h" | |
| 25 #include "core/InputTypeNames.h" | |
| 26 #include "core/dom/ElementRareData.h" | |
| 27 #include "core/dom/Text.h" | |
| 28 #include "core/dom/shadow/ShadowRoot.h" | |
| 29 #include "core/fetch/ImageResource.h" | |
| 30 #include "core/html/FormDataList.h" | |
| 31 #include "core/html/HTMLDivElement.h" | |
| 32 #include "core/html/HTMLElement.h" | |
| 33 #include "core/html/HTMLImageElement.h" | |
| 34 #include "core/html/HTMLImageLoader.h" | |
| 35 #include "core/html/HTMLInputElement.h" | |
| 36 #include "core/html/HTMLStyleElement.h" | |
| 37 #include "wtf/PassOwnPtr.h" | |
| 38 #include "wtf/text/StringBuilder.h" | |
| 39 | |
| 40 namespace blink { | |
| 41 | |
| 42 using namespace HTMLNames; | |
| 43 | |
| 44 static bool noImageSourceSpecified(const Element& element) | |
| 45 { | |
| 46 bool noSrcSpecified = !element.hasAttribute(srcAttr) || element.getAttribute
(srcAttr).isNull() || element.getAttribute(srcAttr).isEmpty(); | |
| 47 bool noSrcsetSpecified = !element.hasAttribute(srcsetAttr) || element.getAtt
ribute(srcsetAttr).isNull() || element.getAttribute(srcsetAttr).isEmpty(); | |
| 48 return noSrcSpecified && noSrcsetSpecified; | |
| 49 } | |
| 50 | |
| 51 void HTMLImageFallbackHelper::createAltTextShadowTree(Element& element) | |
| 52 { | |
| 53 ShadowRoot& root = element.ensureUserAgentShadowRoot(); | |
| 54 RefPtr<HTMLStyleElement> style = HTMLStyleElement::create(element.document()
, false); | |
| 55 root.appendChild(style); | |
| 56 style->setTextContent("#alttext-container { overflow: hidden; border: 1px so
lid silver; padding: 1px; display: inline-block; box-sizing: border-box; } " | |
| 57 "#alttext { overflow: hidden; display: block; } " | |
| 58 "#alttext-image { margin: 0px; }"); | |
| 59 | |
| 60 RefPtr<HTMLDivElement> container = HTMLDivElement::create(element.document()
); | |
| 61 root.appendChild(container); | |
| 62 container->setAttribute(idAttr, AtomicString("alttext-container", AtomicStri
ng::ConstructFromLiteral)); | |
| 63 | |
| 64 RefPtr<HTMLImageElement> brokenImage = HTMLImageElement::create(element.docu
ment()); | |
| 65 container->appendChild(brokenImage); | |
| 66 brokenImage->setIsFallbackImage(); | |
| 67 brokenImage->setAttribute(idAttr, AtomicString("alttext-image", AtomicString
::ConstructFromLiteral)); | |
| 68 brokenImage->setAttribute(widthAttr, AtomicString("16", AtomicString::Constr
uctFromLiteral)); | |
| 69 brokenImage->setAttribute(heightAttr, AtomicString("16", AtomicString::Const
ructFromLiteral)); | |
| 70 brokenImage->setAttribute(alignAttr, AtomicString("left", AtomicString::Cons
tructFromLiteral)); | |
| 71 brokenImage->setAttribute(srcAttr, AtomicString("data:image/png;base64,iVBOR
w0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAABO0lEQVR4XpWRTytEYRTG3/tHLGQr" | |
| 72 "NfEBpKQkmc8gG0ulxpRsfQ0TTXbI3kZ2ys4tsyBZjN1N8idlYUYaxJzzOKf7ztG1MfN0ens
69/x6" | |
| 73 "n/eeYPuo7npS9bCOriXDMQOCTVbO3X+6Wp9mICZWAHqquE1qAA8EQRiFcmYMsQKsAHM2DeK
V4qj4" | |
| 74 "8ZHB++bHwcXTQ+Mz6u/rABwSIQO0wKW5wuLU8E5yWzlJS7OFvaUJMGelAFkkYici1NIXB4D
QbH1J" | |
| 75 "Y2ggVoD4N1Kb2AAA149vUmLLxbHaTaNynIJggAz7G7jTyjB5wOv79/LupT47Cu0rcT6S/ai
755YU" | |
| 76 "iMM4cgw4/I3ERAaI3y/PiFnYPHOBtfORLKX38AaBERaJbHFeAOY3Eu8ZOYByi7Pl+hzWN+n
wWjVB" | |
| 77 "15LhYHXr1PWiH0AYTw4BBjO9AAAAAElFTkSuQmCC", AtomicString::ConstructFromL
iteral)); | |
| 78 | |
| 79 RefPtr<HTMLDivElement> altText = HTMLDivElement::create(element.document()); | |
| 80 container->appendChild(altText); | |
| 81 altText->setAttribute(idAttr, AtomicString("alttext", AtomicString::Construc
tFromLiteral)); | |
| 82 | |
| 83 RefPtr<Text> text = Text::create(element.document(), toHTMLElement(element).
altText()); | |
| 84 altText->appendChild(text); | |
| 85 } | |
| 86 | |
| 87 PassRefPtr<RenderStyle> HTMLImageFallbackHelper::customStyleForAltText(Element&
element, PassRefPtr<RenderStyle> newStyle) | |
| 88 { | |
| 89 // If we have an author shadow root or have not created the UA shadow root y
et, bail early. We can't | |
| 90 // use ensureUserAgentShadowRoot() here because that would alter the DOM tre
e during style recalc. | |
| 91 if (element.shadowRoot() || !element.userAgentShadowRoot()) | |
| 92 return newStyle; | |
| 93 | |
| 94 Element* placeHolder = element.userAgentShadowRoot()->getElementById("alttex
t-container"); | |
| 95 Element* brokenImage = element.userAgentShadowRoot()->getElementById("alttex
t-image"); | |
| 96 | |
| 97 if (element.document().inQuirksMode()) { | |
| 98 // Mimic the behaviour of the image host by setting symmetric dimensions
if only one dimension is specified. | |
| 99 if (newStyle->width().isSpecifiedOrIntrinsic() && newStyle->height().isA
uto()) | |
| 100 newStyle->setHeight(newStyle->width()); | |
| 101 else if (newStyle->height().isSpecifiedOrIntrinsic() && newStyle->width(
).isAuto()) | |
| 102 newStyle->setWidth(newStyle->height()); | |
| 103 if (newStyle->width().isSpecifiedOrIntrinsic() && newStyle->height().isS
pecifiedOrIntrinsic()) { | |
| 104 placeHolder->setInlineStyleProperty(CSSPropertyVerticalAlign, CSSVal
ueBaseline); | |
| 105 } | |
| 106 } | |
| 107 | |
| 108 // If the image has specified dimensions allow the alt-text container expand
to fill them. | |
| 109 if (newStyle->width().isSpecifiedOrIntrinsic() && newStyle->height().isSpeci
fiedOrIntrinsic()) { | |
| 110 placeHolder->setInlineStyleProperty(CSSPropertyWidth, 100, CSSPrimitiveV
alue::CSS_PERCENTAGE); | |
| 111 placeHolder->setInlineStyleProperty(CSSPropertyHeight, 100, CSSPrimitive
Value::CSS_PERCENTAGE); | |
| 112 } | |
| 113 | |
| 114 // Make sure the broken image icon appears on the appropriate side of the im
age for the element's writing direction. | |
| 115 brokenImage->setInlineStyleProperty(CSSPropertyFloat, AtomicString(newStyle-
>direction() == LTR ? "left" : "right")); | |
| 116 | |
| 117 // This is an <img> with no attributes, so don't display anything. | |
| 118 if (noImageSourceSpecified(element) && !newStyle->width().isSpecifiedOrIntri
nsic() && !newStyle->height().isSpecifiedOrIntrinsic() && toHTMLElement(element)
.altText().isEmpty()) | |
| 119 newStyle->setDisplay(NONE); | |
| 120 | |
| 121 // This preserves legacy behaviour originally defined when alt-text was mana
ged by RenderImage. | |
| 122 if (noImageSourceSpecified(element)) | |
| 123 brokenImage->setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone); | |
| 124 else | |
| 125 brokenImage->setInlineStyleProperty(CSSPropertyDisplay, CSSValueInline); | |
| 126 | |
| 127 return newStyle; | |
| 128 } | |
| 129 | |
| 130 } // namespace blink | |
| 131 | |
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Chromium Code Reviews
Issue 696123002:
Revert of Use Shadow DOM to display fallback content for images (Closed)
Base URL: svn://svn.chromium.org/blink/trunk