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CSSCursorImageValue.cpp
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128 lines (110 loc) · 5.07 KB
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/*
* Copyright (C) 2006 Rob Buis <buis@kde.org>
* (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2008-2021 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "CSSCursorImageValue.h"
#include "CSSImageSetValue.h"
#include "CSSImageValue.h"
#include "SVGCursorElement.h"
#include "SVGLengthContext.h"
#include "SVGURIReference.h"
#include "StyleBuilderState.h"
#include <wtf/MathExtras.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
CSSCursorImageValue::CSSCursorImageValue(Ref<CSSValue>&& imageValue, const std::optional<IntPoint>& hotSpot, LoadedFromOpaqueSource loadedFromOpaqueSource)
: CSSValue(CursorImageClass)
, m_imageValue(WTFMove(imageValue))
, m_hotSpot(hotSpot)
, m_loadedFromOpaqueSource(loadedFromOpaqueSource)
{
if (is<CSSImageValue>(m_imageValue.get()))
m_originalURL = downcast<CSSImageValue>(m_imageValue.get()).imageURL();
}
Ref<CSSCursorImageValue> CSSCursorImageValue::create(Ref<CSSValue>&& imageValue, const std::optional<IntPoint>& hotSpot, LoadedFromOpaqueSource loadedFromOpaqueSource)
{
return adoptRef(*new CSSCursorImageValue(WTFMove(imageValue), hotSpot, loadedFromOpaqueSource));
}
CSSCursorImageValue::~CSSCursorImageValue()
{
for (auto* element : m_cursorElements)
element->removeClient(*this);
}
String CSSCursorImageValue::customCSSText() const
{
String text = m_imageValue.get().cssText();
if (!m_hotSpot)
return text;
return makeString(text, ' ', m_hotSpot->x(), ' ', m_hotSpot->y());
}
// FIXME: Should this function take a TreeScope instead?
SVGCursorElement* CSSCursorImageValue::updateCursorElement(const Document& document)
{
auto element = SVGURIReference::targetElementFromIRIString(m_originalURL.string(), document).element;
if (!is<SVGCursorElement>(element))
return nullptr;
// FIXME: Not right to keep old cursor elements as clients. The new one should replace the old, not join it in a set.
auto& cursorElement = downcast<SVGCursorElement>(*element);
if (m_cursorElements.add(&cursorElement).isNewEntry) {
cursorElementChanged(cursorElement);
cursorElement.addClient(*this);
}
return &cursorElement;
}
void CSSCursorImageValue::cursorElementRemoved(SVGCursorElement& cursorElement)
{
// FIXME: Not right to stay a client of a cursor element until the element is destroyed. We'd want to stop being a client once it's no longer a valid target, like when it's disconnected.
m_cursorElements.remove(&cursorElement);
}
void CSSCursorImageValue::cursorElementChanged(SVGCursorElement& cursorElement)
{
// FIXME: Seems wrong that changing an old cursor element, one that that is no longer the target, changes the hot spot.
// FIXME: This will override a hot spot that was specified in CSS, which is probably incorrect.
// FIXME: Should we clamp from float to int instead of just casting here?
SVGLengthContext lengthContext(nullptr);
m_hotSpot = IntPoint {
static_cast<int>(std::round(cursorElement.x().value(lengthContext))),
static_cast<int>(std::round(cursorElement.y().value(lengthContext)))
};
// FIXME: Why doesn't this funtion check for a change to the href of the cursor element? Why would we dynamically track changes to x/y but not href?
}
ImageWithScale CSSCursorImageValue::selectBestFitImage(const Document& document)
{
if (is<CSSImageSetValue>(m_imageValue.get()))
return downcast<CSSImageSetValue>(m_imageValue.get()).selectBestFitImage(document);
if (auto* cursorElement = updateCursorElement(document)) {
auto location = document.completeURL(cursorElement->href());
if (location != downcast<CSSImageValue>(m_imageValue.get()).imageURL())
m_imageValue = CSSImageValue::create(WTFMove(location), m_loadedFromOpaqueSource);
}
return { m_imageValue.ptr() , 1 };
}
bool CSSCursorImageValue::equals(const CSSCursorImageValue& other) const
{
return m_hotSpot == other.m_hotSpot && compareCSSValue(m_imageValue, other.m_imageValue);
}
Ref<CSSCursorImageValue> CSSCursorImageValue::valueWithStylesResolved(Style::BuilderState& state)
{
auto imageValue = state.resolveImageStyles(m_imageValue.get());
if (imageValue.ptr() == m_imageValue.ptr())
return *this;
return create(WTFMove(imageValue), m_hotSpot, m_loadedFromOpaqueSource);
}
} // namespace WebCore