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/**
* Copyright (C) 2005-2022 Apple Inc.
* Copyright (C) 2015 Google 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 "RenderButton.h"
#include "Document.h"
#include "GraphicsContext.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "LayoutIntegrationLineLayout.h"
#include "RenderBoxInlines.h"
#include "RenderBoxModelObjectInlines.h"
#include "RenderChildIterator.h"
#include "RenderElementInlines.h"
#include "RenderStyleSetters.h"
#include "RenderTheme.h"
#include "RenderTreeBuilder.h"
#include "StyleInheritedData.h"
#include <wtf/TZoneMallocInlines.h>
#if PLATFORM(IOS_FAMILY)
#include "RenderThemeIOS.h"
#endif
namespace WebCore {
using namespace HTMLNames;
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(RenderButton);
RenderButton::RenderButton(HTMLFormControlElement& element, RenderStyle&& style)
: RenderFlexibleBox(Type::Button, element, WTFMove(style))
{
ASSERT(isRenderButton());
}
RenderButton::~RenderButton() = default;
HTMLFormControlElement& RenderButton::formControlElement() const
{
return downcast<HTMLFormControlElement>(nodeForNonAnonymous());
}
bool RenderButton::canBeSelectionLeaf() const
{
return formControlElement().hasEditableStyle();
}
bool RenderButton::hasLineIfEmpty() const
{
return is<HTMLInputElement>(formControlElement());
}
void RenderButton::setInnerRenderer(RenderBlock& innerRenderer)
{
ASSERT(!m_inner.get());
m_inner = innerRenderer;
updateAnonymousChildStyle(m_inner->mutableStyle());
if (m_inner && m_inner->layoutBox()) {
if (auto* inlineFormattingContextRoot = dynamicDowncast<RenderBlockFlow>(*m_inner); inlineFormattingContextRoot && inlineFormattingContextRoot->inlineLayout())
inlineFormattingContextRoot->inlineLayout()->rootStyleWillChange(*inlineFormattingContextRoot, inlineFormattingContextRoot->style());
if (auto* lineLayout = LayoutIntegration::LineLayout::containing(*m_inner))
lineLayout->styleWillChange(*m_inner, m_inner->style(), StyleDifference::Layout);
LayoutIntegration::LineLayout::updateStyle(*m_inner);
for (auto& child : childrenOfType<RenderText>(*m_inner))
LayoutIntegration::LineLayout::updateStyle(child);
}
}
void RenderButton::updateAnonymousChildStyle(RenderStyle& childStyle) const
{
childStyle.setFlexGrow(1.0f);
// min-inline-size: 0; is needed for correct shrinking.
// Use margin-block:auto instead of align-items:center to get safe centering, i.e.
// when the content overflows, treat it the same as align-items: flex-start.
if (isHorizontalWritingMode()) {
childStyle.setMinWidth(Length(0, LengthType::Fixed));
childStyle.setMarginTop(Length());
childStyle.setMarginBottom(Length());
} else {
childStyle.setMinHeight(Length(0, LengthType::Fixed));
childStyle.setMarginLeft(Length());
childStyle.setMarginRight(Length());
}
childStyle.setFlexDirection(style().flexDirection());
childStyle.setJustifyContent(style().justifyContent());
childStyle.setFlexWrap(style().flexWrap());
childStyle.setAlignItems(style().alignItems());
childStyle.setAlignContent(style().alignContent());
childStyle.setTextBoxTrim(style().textBoxTrim());
}
void RenderButton::updateFromElement()
{
// If we're an input element, we may need to change our button text.
if (RefPtr input = dynamicDowncast<HTMLInputElement>(formControlElement())) {
String value = input->valueWithDefault();
setText(value);
}
}
void RenderButton::setText(const String& str)
{
if (!m_buttonText && str.isEmpty())
return;
if (!m_buttonText) {
auto newButtonText = createRenderer<RenderTextFragment>(document(), str);
m_buttonText = *newButtonText;
// FIXME: This mutation should go through the normal RenderTreeBuilder path.
if (RenderTreeBuilder::current())
RenderTreeBuilder::current()->attach(*this, WTFMove(newButtonText));
else
RenderTreeBuilder(*document().renderView()).attach(*this, WTFMove(newButtonText));
return;
}
if (!str.isEmpty()) {
m_buttonText->setText(str.impl());
return;
}
if (RenderTreeBuilder::current())
RenderTreeBuilder::current()->destroy(*m_buttonText);
else
RenderTreeBuilder(*document().renderView()).destroy(*m_buttonText);
}
String RenderButton::text() const
{
if (m_buttonText)
return m_buttonText->text();
return { };
}
bool RenderButton::canHaveGeneratedChildren() const
{
// Input elements can't have generated children, but button elements can. We'll
// write the code assuming any other button types that might emerge in the future
// can also have children.
return !is<HTMLInputElement>(formControlElement());
}
LayoutRect RenderButton::controlClipRect(const LayoutPoint& additionalOffset) const
{
// Clip to the padding box to at least give content the extra padding space.
return LayoutRect(additionalOffset.x() + borderLeft(), additionalOffset.y() + borderTop(), width() - borderLeft() - borderRight(), height() - borderTop() - borderBottom());
}
static LayoutUnit synthesizedBaselineFromContentBox(const RenderBox& box, LineDirectionMode direction)
{
return direction == HorizontalLine ? box.borderTop() + box.paddingTop() + box.contentBoxHeight() : box.borderRight() + box.paddingRight() + box.contentBoxWidth();
}
LayoutUnit RenderButton::baselinePosition(FontBaseline fontBaseline, bool firstLine, LineDirectionMode direction, LinePositionMode mode) const
{
if (shouldApplyLayoutContainment())
return RenderFlexibleBox::baselinePosition(fontBaseline, firstLine, direction, mode);
// We cannot rely on RenderFlexibleBox::baselinePosition() because of flexboxes have some special behavior
// regarding baselines that shouldn't apply to buttons.
LayoutUnit baseline = firstLineBaseline().value_or(synthesizedBaselineFromContentBox(*this, direction));
LayoutUnit marginAscent = direction == HorizontalLine ? marginTop() : marginRight();
return baseline + marginAscent;
}
#if PLATFORM(IOS_FAMILY)
void RenderButton::layout()
{
RenderFlexibleBox::layout();
// FIXME: We should not be adjusting styles during layout. See <rdar://problem/7675493>.
RenderThemeIOS::adjustRoundBorderRadius(mutableStyle(), *this);
}
#endif
// Only clip overflow on input elements, to match other browsers.
bool RenderButton::hasControlClip() const
{
return is<HTMLInputElement>(formControlElement());
}
} // namespace WebCore
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