| /** |
| * Copyright (C) 2005 Apple Computer, Inc. |
| * |
| * 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 "third_party/blink/renderer/core/layout/layout_button.h" |
| |
| #include "third_party/blink/renderer/core/frame/web_feature.h" |
| |
| namespace blink { |
| |
| LayoutButton::LayoutButton(Element* element) |
| : LayoutFlexibleBox(element), inner_(nullptr) {} |
| |
| LayoutButton::~LayoutButton() = default; |
| |
| void LayoutButton::AddChild(LayoutObject* new_child, |
| LayoutObject* before_child) { |
| if (!inner_) { |
| // Create an anonymous block. |
| DCHECK(!FirstChild()); |
| inner_ = CreateAnonymousBlock(StyleRef().Display()); |
| LayoutFlexibleBox::AddChild(inner_); |
| } |
| |
| inner_->AddChild(new_child, before_child); |
| } |
| |
| void LayoutButton::RemoveChild(LayoutObject* old_child) { |
| if (old_child == inner_ || !inner_) { |
| LayoutFlexibleBox::RemoveChild(old_child); |
| inner_ = nullptr; |
| |
| } else if (old_child->Parent() == this) { |
| // We aren't the inner node, but we're getting removed from the button, this |
| // can happen with things like scrollable area resizer's. |
| LayoutFlexibleBox::RemoveChild(old_child); |
| |
| } else { |
| inner_->RemoveChild(old_child); |
| } |
| } |
| |
| void LayoutButton::UpdateAnonymousChildStyle(const LayoutObject* child, |
| ComputedStyle& child_style) const { |
| DCHECK_EQ(inner_, child); |
| UpdateAnonymousChildStyle(StyleRef(), child_style); |
| } |
| |
| // This function is shared with LayoutNGButton. |
| void LayoutButton::UpdateAnonymousChildStyle(const ComputedStyle& parent_style, |
| ComputedStyle& child_style) { |
| child_style.SetFlexGrow(1.0f); |
| // min-width: 0; is needed for correct shrinking. |
| child_style.SetMinWidth(Length::Fixed(0)); |
| // Use margin: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. |
| child_style.SetMarginTop(Length()); |
| child_style.SetMarginBottom(Length()); |
| child_style.SetFlexDirection(parent_style.FlexDirection()); |
| child_style.SetJustifyContent(parent_style.JustifyContent()); |
| child_style.SetFlexWrap(parent_style.FlexWrap()); |
| // TODO (lajava): An anonymous box must not be used to resolve children's auto |
| // values. |
| child_style.SetAlignItems(parent_style.AlignItems()); |
| child_style.SetAlignContent(parent_style.AlignContent()); |
| } |
| |
| LayoutUnit LayoutButton::BaselinePosition( |
| FontBaseline baseline, |
| bool first_line, |
| LineDirectionMode direction, |
| LinePositionMode line_position_mode) const { |
| DCHECK_EQ(line_position_mode, kPositionOnContainingLine); |
| // We want to call the LayoutBlock version of firstLineBoxBaseline to |
| // avoid LayoutFlexibleBox synthesizing a baseline that we don't want. |
| // We use this check as a proxy for "are there any line boxes in this button" |
| if (!HasLineIfEmpty() && !ShouldApplyLayoutContainment() && |
| LayoutBlock::FirstLineBoxBaseline() == -1) { |
| // To ensure that we have a consistent baseline when we have no children, |
| // even when we have the anonymous LayoutBlock child, we calculate the |
| // baseline for the empty case manually here. |
| if (direction == kHorizontalLine) { |
| return MarginTop() + Size().Height() - BorderBottom() - PaddingBottom() - |
| HorizontalScrollbarHeight(); |
| } |
| return MarginRight() + Size().Width() - BorderLeft() - PaddingLeft() - |
| VerticalScrollbarWidth(); |
| } |
| LayoutUnit result_baseline = LayoutFlexibleBox::BaselinePosition( |
| baseline, first_line, direction, line_position_mode); |
| // See crbug.com/690036 and crbug.com/304848. |
| LayoutUnit correct_baseline = LayoutBlock::InlineBlockBaseline(direction); |
| if (correct_baseline != result_baseline && |
| ShouldCountWrongBaseline(StyleRef(), |
| Parent() ? Parent()->Style() : nullptr)) { |
| for (LayoutBox* child = FirstChildBox(); child; |
| child = child->NextSiblingBox()) { |
| if (!child->IsFloatingOrOutOfFlowPositioned()) { |
| UseCounter::Count(GetDocument(), |
| WebFeature::kWrongBaselineOfMultiLineButton); |
| return result_baseline; |
| } |
| } |
| UseCounter::Count(GetDocument(), |
| WebFeature::kWrongBaselineOfEmptyLineButton); |
| } |
| return result_baseline; |
| } |
| |
| bool LayoutButton::ShouldCountWrongBaseline(const ComputedStyle& style, |
| const ComputedStyle* parent_style) { |
| if (parent_style) { |
| EDisplay display = parent_style->Display(); |
| if (display == EDisplay::kFlex || display == EDisplay::kInlineFlex || |
| display == EDisplay::kGrid || display == EDisplay::kInlineGrid) { |
| StyleSelfAlignmentData alignment = |
| style.ResolvedAlignSelf(ItemPosition::kAuto, parent_style); |
| return alignment.GetPosition() == ItemPosition::kBaseline || |
| alignment.GetPosition() == ItemPosition::kLastBaseline; |
| } |
| } |
| EVerticalAlign align = style.VerticalAlign(); |
| return align == EVerticalAlign::kBaseline || |
| align == EVerticalAlign::kBaselineMiddle || |
| align == EVerticalAlign::kSub || align == EVerticalAlign::kSuper || |
| align == EVerticalAlign::kLength; |
| } |
| |
| } // namespace blink |