| /* |
| * Copyright (C) 2008, 2009, 2013, 2015 Apple Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "RenderScrollbar.h" |
| |
| #include "Frame.h" |
| #include "FrameView.h" |
| #include "RenderScrollbarPart.h" |
| #include "RenderScrollbarTheme.h" |
| #include "RenderWidget.h" |
| #include "StyleInheritedData.h" |
| #include "StyleResolver.h" |
| |
| namespace WebCore { |
| |
| Ref<Scrollbar> RenderScrollbar::createCustomScrollbar(ScrollableArea& scrollableArea, ScrollbarOrientation orientation, Element* ownerElement, Frame* owningFrame) |
| { |
| return adoptRef(*new RenderScrollbar(scrollableArea, orientation, ownerElement, owningFrame)); |
| } |
| |
| RenderScrollbar::RenderScrollbar(ScrollableArea& scrollableArea, ScrollbarOrientation orientation, Element* ownerElement, Frame* owningFrame) |
| : Scrollbar(scrollableArea, orientation, ScrollbarControlSize::Regular, RenderScrollbarTheme::renderScrollbarTheme(), true) |
| , m_ownerElement(ownerElement) |
| , m_owningFrame(owningFrame) |
| { |
| ASSERT(ownerElement || owningFrame); |
| |
| // FIXME: We need to do this because RenderScrollbar::styleChanged is called as soon as the scrollbar is created. |
| |
| // Update the scrollbar size. |
| int width = 0; |
| int height = 0; |
| updateScrollbarPart(ScrollbarBGPart); |
| if (RenderScrollbarPart* part = m_parts.get(ScrollbarBGPart)) { |
| part->layout(); |
| width = part->width(); |
| height = part->height(); |
| } else if (this->orientation() == ScrollbarOrientation::Horizontal) |
| width = this->width(); |
| else |
| height = this->height(); |
| |
| setFrameRect(IntRect(0, 0, width, height)); |
| } |
| |
| RenderScrollbar::~RenderScrollbar() = default; |
| |
| RenderBox* RenderScrollbar::owningRenderer() const |
| { |
| if (m_owningFrame) { |
| RenderWidget* currentRenderer = m_owningFrame->ownerRenderer(); |
| return currentRenderer; |
| } |
| ASSERT(m_ownerElement); |
| if (m_ownerElement->renderer()) |
| return &m_ownerElement->renderer()->enclosingBox(); |
| return nullptr; |
| } |
| |
| void RenderScrollbar::setParent(ScrollView* parent) |
| { |
| Scrollbar::setParent(parent); |
| if (!parent) |
| m_parts.clear(); |
| } |
| |
| void RenderScrollbar::setEnabled(bool e) |
| { |
| bool wasEnabled = enabled(); |
| Scrollbar::setEnabled(e); |
| if (wasEnabled != e) |
| updateScrollbarParts(); |
| } |
| |
| void RenderScrollbar::styleChanged() |
| { |
| updateScrollbarParts(); |
| } |
| |
| void RenderScrollbar::paint(GraphicsContext& context, const IntRect& damageRect, Widget::SecurityOriginPaintPolicy, EventRegionContext*) |
| { |
| if (context.invalidatingControlTints()) { |
| updateScrollbarParts(); |
| return; |
| } |
| Scrollbar::paint(context, damageRect); |
| } |
| |
| void RenderScrollbar::setHoveredPart(ScrollbarPart part) |
| { |
| if (part == m_hoveredPart) |
| return; |
| |
| ScrollbarPart oldPart = m_hoveredPart; |
| m_hoveredPart = part; |
| |
| updateScrollbarPart(oldPart); |
| updateScrollbarPart(m_hoveredPart); |
| |
| updateScrollbarPart(ScrollbarBGPart); |
| updateScrollbarPart(TrackBGPart); |
| } |
| |
| void RenderScrollbar::setPressedPart(ScrollbarPart part) |
| { |
| ScrollbarPart oldPart = m_pressedPart; |
| Scrollbar::setPressedPart(part); |
| |
| updateScrollbarPart(oldPart); |
| updateScrollbarPart(part); |
| |
| updateScrollbarPart(ScrollbarBGPart); |
| updateScrollbarPart(TrackBGPart); |
| } |
| |
| std::unique_ptr<RenderStyle> RenderScrollbar::getScrollbarPseudoStyle(ScrollbarPart partType, PseudoId pseudoId) const |
| { |
| if (!owningRenderer()) |
| return nullptr; |
| |
| StyleScrollbarState scrollbarState; |
| scrollbarState.scrollbarPart = partType; |
| scrollbarState.hoveredPart = hoveredPart(); |
| scrollbarState.pressedPart = pressedPart(); |
| scrollbarState.orientation = orientation(); |
| scrollbarState.buttonsPlacement = theme().buttonsPlacement(); |
| scrollbarState.enabled = enabled(); |
| scrollbarState.scrollCornerIsVisible = scrollableArea().isScrollCornerVisible(); |
| |
| std::unique_ptr<RenderStyle> result = owningRenderer()->getUncachedPseudoStyle({ pseudoId, scrollbarState }, &owningRenderer()->style()); |
| // Scrollbars for root frames should always have background color |
| // unless explicitly specified as transparent. So we force it. |
| // This is because WebKit assumes scrollbar to be always painted and missing background |
| // causes visual artifact like non-repainted dirty region. |
| if (result && m_owningFrame && m_owningFrame->view() && !m_owningFrame->view()->isTransparent() && !result->hasBackground()) |
| result->setBackgroundColor(Color::white); |
| |
| return result; |
| } |
| |
| void RenderScrollbar::updateScrollbarParts() |
| { |
| updateScrollbarPart(ScrollbarBGPart); |
| updateScrollbarPart(BackButtonStartPart); |
| updateScrollbarPart(ForwardButtonStartPart); |
| updateScrollbarPart(BackTrackPart); |
| updateScrollbarPart(ThumbPart); |
| updateScrollbarPart(ForwardTrackPart); |
| updateScrollbarPart(BackButtonEndPart); |
| updateScrollbarPart(ForwardButtonEndPart); |
| updateScrollbarPart(TrackBGPart); |
| |
| // See if the scrollbar's thickness changed. If so, we need to mark our owning object as needing a layout. |
| bool isHorizontal = orientation() == ScrollbarOrientation::Horizontal; |
| int oldThickness = isHorizontal ? height() : width(); |
| int newThickness = 0; |
| RenderScrollbarPart* part = m_parts.get(ScrollbarBGPart); |
| if (part) { |
| part->layout(); |
| newThickness = isHorizontal ? part->height() : part->width(); |
| } |
| |
| if (newThickness != oldThickness) { |
| setFrameRect(IntRect(location(), IntSize(isHorizontal ? width() : newThickness, isHorizontal ? newThickness : height()))); |
| if (RenderBox* box = owningRenderer()) |
| box->setChildNeedsLayout(); |
| } |
| } |
| |
| static PseudoId pseudoForScrollbarPart(ScrollbarPart part) |
| { |
| switch (part) { |
| case BackButtonStartPart: |
| case ForwardButtonStartPart: |
| case BackButtonEndPart: |
| case ForwardButtonEndPart: |
| return PseudoId::ScrollbarButton; |
| case BackTrackPart: |
| case ForwardTrackPart: |
| return PseudoId::ScrollbarTrackPiece; |
| case ThumbPart: |
| return PseudoId::ScrollbarThumb; |
| case TrackBGPart: |
| return PseudoId::ScrollbarTrack; |
| case ScrollbarBGPart: |
| return PseudoId::Scrollbar; |
| case NoPart: |
| case AllParts: |
| break; |
| } |
| ASSERT_NOT_REACHED(); |
| return PseudoId::Scrollbar; |
| } |
| |
| void RenderScrollbar::updateScrollbarPart(ScrollbarPart partType) |
| { |
| if (partType == NoPart) |
| return; |
| |
| std::unique_ptr<RenderStyle> partStyle = getScrollbarPseudoStyle(partType, pseudoForScrollbarPart(partType)); |
| bool needRenderer = partStyle && partStyle->display() != DisplayType::None; |
| |
| if (needRenderer && partStyle->display() != DisplayType::Block) { |
| // See if we are a button that should not be visible according to OS settings. |
| ScrollbarButtonsPlacement buttonsPlacement = theme().buttonsPlacement(); |
| switch (partType) { |
| case BackButtonStartPart: |
| needRenderer = (buttonsPlacement == ScrollbarButtonsSingle || buttonsPlacement == ScrollbarButtonsDoubleStart || |
| buttonsPlacement == ScrollbarButtonsDoubleBoth); |
| break; |
| case ForwardButtonStartPart: |
| needRenderer = (buttonsPlacement == ScrollbarButtonsDoubleStart || buttonsPlacement == ScrollbarButtonsDoubleBoth); |
| break; |
| case BackButtonEndPart: |
| needRenderer = (buttonsPlacement == ScrollbarButtonsDoubleEnd || buttonsPlacement == ScrollbarButtonsDoubleBoth); |
| break; |
| case ForwardButtonEndPart: |
| needRenderer = (buttonsPlacement == ScrollbarButtonsSingle || buttonsPlacement == ScrollbarButtonsDoubleEnd || |
| buttonsPlacement == ScrollbarButtonsDoubleBoth); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| if (!needRenderer) { |
| m_parts.remove(partType); |
| return; |
| } |
| |
| if (auto& partRendererSlot = m_parts.add(partType, nullptr).iterator->value) |
| partRendererSlot->setStyle(WTFMove(*partStyle)); |
| else { |
| partRendererSlot = createRenderer<RenderScrollbarPart>(owningRenderer()->document(), WTFMove(*partStyle), this, partType); |
| partRendererSlot->initializeStyle(); |
| } |
| } |
| |
| void RenderScrollbar::paintPart(GraphicsContext& graphicsContext, ScrollbarPart partType, const IntRect& rect) |
| { |
| RenderScrollbarPart* partRenderer = m_parts.get(partType); |
| if (!partRenderer) |
| return; |
| partRenderer->paintIntoRect(graphicsContext, location(), rect); |
| } |
| |
| IntRect RenderScrollbar::buttonRect(ScrollbarPart partType) const |
| { |
| RenderScrollbarPart* partRenderer = m_parts.get(partType); |
| if (!partRenderer) |
| return IntRect(); |
| |
| partRenderer->layout(); |
| |
| bool isHorizontal = orientation() == ScrollbarOrientation::Horizontal; |
| IntSize pixelSnappedIntSize = snappedIntRect(partRenderer->frameRect()).size(); |
| if (partType == BackButtonStartPart) |
| return IntRect(location(), IntSize(isHorizontal ? pixelSnappedIntSize.width() : width(), isHorizontal ? height() : pixelSnappedIntSize.height())); |
| if (partType == ForwardButtonEndPart) |
| return IntRect(isHorizontal ? x() + width() - pixelSnappedIntSize.width() : x(), isHorizontal ? y() : y() + height() - pixelSnappedIntSize.height(), |
| isHorizontal ? pixelSnappedIntSize.width() : width(), |
| isHorizontal ? height() : pixelSnappedIntSize.height()); |
| |
| if (partType == ForwardButtonStartPart) { |
| IntRect previousButton = buttonRect(BackButtonStartPart); |
| return IntRect(isHorizontal ? x() + previousButton.width() : x(), |
| isHorizontal ? y() : y() + previousButton.height(), |
| isHorizontal ? pixelSnappedIntSize.width() : width(), |
| isHorizontal ? height() : pixelSnappedIntSize.height()); |
| } |
| |
| IntRect followingButton = buttonRect(ForwardButtonEndPart); |
| return IntRect(isHorizontal ? x() + width() - followingButton.width() - pixelSnappedIntSize.width() : x(), |
| isHorizontal ? y() : y() + height() - followingButton.height() - pixelSnappedIntSize.height(), |
| isHorizontal ? pixelSnappedIntSize.width() : width(), |
| isHorizontal ? height() : pixelSnappedIntSize.height()); |
| } |
| |
| IntRect RenderScrollbar::trackRect(int startLength, int endLength) const |
| { |
| RenderScrollbarPart* part = m_parts.get(TrackBGPart); |
| if (part) |
| part->layout(); |
| |
| if (orientation() == ScrollbarOrientation::Horizontal) { |
| int marginLeft = part ? static_cast<int>(part->marginLeft()) : 0; |
| int marginRight = part ? static_cast<int>(part->marginRight()) : 0; |
| startLength += marginLeft; |
| endLength += marginRight; |
| int totalLength = startLength + endLength; |
| return IntRect(x() + startLength, y(), width() - totalLength, height()); |
| } |
| |
| int marginTop = part ? static_cast<int>(part->marginTop()) : 0; |
| int marginBottom = part ? static_cast<int>(part->marginBottom()) : 0; |
| startLength += marginTop; |
| endLength += marginBottom; |
| int totalLength = startLength + endLength; |
| |
| return IntRect(x(), y() + startLength, width(), height() - totalLength); |
| } |
| |
| IntRect RenderScrollbar::trackPieceRectWithMargins(ScrollbarPart partType, const IntRect& oldRect) const |
| { |
| RenderScrollbarPart* partRenderer = m_parts.get(partType); |
| if (!partRenderer) |
| return oldRect; |
| |
| partRenderer->layout(); |
| |
| IntRect rect = oldRect; |
| if (orientation() == ScrollbarOrientation::Horizontal) { |
| rect.setX(rect.x() + partRenderer->marginLeft()); |
| rect.setWidth(rect.width() - partRenderer->horizontalMarginExtent()); |
| } else { |
| rect.setY(rect.y() + partRenderer->marginTop()); |
| rect.setHeight(rect.height() - partRenderer->verticalMarginExtent()); |
| } |
| return rect; |
| } |
| |
| int RenderScrollbar::minimumThumbLength() const |
| { |
| RenderScrollbarPart* partRenderer = m_parts.get(ThumbPart); |
| if (!partRenderer) |
| return 0; |
| partRenderer->layout(); |
| return orientation() == ScrollbarOrientation::Horizontal ? partRenderer->width() : partRenderer->height(); |
| } |
| |
| float RenderScrollbar::opacity() const |
| { |
| RenderScrollbarPart* partRenderer = m_parts.get(ScrollbarBGPart); |
| if (!partRenderer) |
| return 1; |
| |
| return partRenderer->style().opacity(); |
| } |
| |
| bool RenderScrollbar::isHiddenByStyle() const |
| { |
| std::unique_ptr<RenderStyle> partStyle = getScrollbarPseudoStyle(ScrollbarBGPart, pseudoForScrollbarPart(ScrollbarBGPart)); |
| return partStyle && partStyle->display() == DisplayType::None; |
| } |
| |
| } |
