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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004, 2005, 2006 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 "core/layout/LayoutFieldset.h"
#include "core/CSSPropertyNames.h"
#include "core/html/forms/HTMLLegendElement.h"
#include "core/html_names.h"
#include "core/paint/FieldsetPainter.h"
namespace blink {
using namespace HTMLNames;
LayoutFieldset::LayoutFieldset(Element* element) : LayoutBlockFlow(element) {}
void LayoutFieldset::ComputePreferredLogicalWidths() {
LayoutBlockFlow::ComputePreferredLogicalWidths();
if (LayoutBox* legend = FindInFlowLegend()) {
int legend_min_width = legend->MinPreferredLogicalWidth().ToInt();
Length legend_margin_left = legend->Style()->MarginLeft();
Length legend_margin_right = legend->Style()->MarginRight();
if (legend_margin_left.IsFixed())
legend_min_width += legend_margin_left.Value();
if (legend_margin_right.IsFixed())
legend_min_width += legend_margin_right.Value();
min_preferred_logical_width_ =
max(min_preferred_logical_width_,
legend_min_width + BorderAndPaddingWidth());
}
}
LayoutObject* LayoutFieldset::LayoutSpecialExcludedChild(bool relayout_children,
SubtreeLayoutScope&) {
LayoutBox* legend = FindInFlowLegend();
if (legend) {
LayoutRect old_legend_frame_rect = legend->FrameRect();
if (relayout_children)
legend->SetNeedsLayoutAndFullPaintInvalidation(
LayoutInvalidationReason::kFieldsetChanged);
legend->LayoutIfNeeded();
LayoutUnit logical_left;
if (Style()->IsLeftToRightDirection()) {
switch (legend->Style()->GetTextAlign()) {
case ETextAlign::kCenter:
logical_left = (LogicalWidth() - LogicalWidthForChild(*legend)) / 2;
break;
case ETextAlign::kRight:
logical_left = LogicalWidth() - BorderEnd() - PaddingEnd() -
LogicalWidthForChild(*legend);
break;
default:
logical_left =
BorderStart() + PaddingStart() + MarginStartForChild(*legend);
break;
}
} else {
switch (legend->Style()->GetTextAlign()) {
case ETextAlign::kLeft:
logical_left = BorderStart() + PaddingStart();
break;
case ETextAlign::kCenter: {
// Make sure that the extra pixel goes to the end side in RTL (since
// it went to the end side in LTR).
LayoutUnit centered_width =
LogicalWidth() - LogicalWidthForChild(*legend);
logical_left = centered_width - centered_width / 2;
break;
}
default:
logical_left = LogicalWidth() - BorderStart() - PaddingStart() -
MarginStartForChild(*legend) -
LogicalWidthForChild(*legend);
break;
}
}
SetLogicalLeftForChild(*legend, logical_left);
LayoutUnit fieldset_border_before = LayoutUnit(BorderBefore());
LayoutUnit legend_logical_height = LogicalHeightForChild(*legend);
LayoutUnit legend_logical_top;
LayoutUnit collapsed_legend_extent;
// FIXME: We need to account for the legend's margin before too.
if (fieldset_border_before > legend_logical_height) {
// The <legend> is smaller than the associated fieldset before border
// so the latter determines positioning of the <legend>. The sizing
// depends
// on the legend's margins as we want to still follow the author's cues.
// Firefox completely ignores the margins in this case which seems wrong.
legend_logical_top = (fieldset_border_before - legend_logical_height) / 2;
collapsed_legend_extent = max<LayoutUnit>(
fieldset_border_before, legend_logical_top + legend_logical_height +
MarginAfterForChild(*legend));
} else {
collapsed_legend_extent =
legend_logical_height + MarginAfterForChild(*legend);
}
SetLogicalTopForChild(*legend, legend_logical_top);
SetLogicalHeight(PaddingBefore() + collapsed_legend_extent);
if (legend->FrameRect() != old_legend_frame_rect) {
// We need to invalidate the fieldset border if the legend's frame
// changed.
SetShouldDoFullPaintInvalidation();
}
}
return legend;
}
LayoutBox* LayoutFieldset::FindInFlowLegend() const {
for (LayoutObject* legend = FirstChild(); legend;
legend = legend->NextSibling()) {
if (legend->IsFloatingOrOutOfFlowPositioned())
continue;
if (IsHTMLLegendElement(legend->GetNode()))
return ToLayoutBox(legend);
}
return nullptr;
}
void LayoutFieldset::PaintBoxDecorationBackground(
const PaintInfo& paint_info,
const LayoutPoint& paint_offset) const {
FieldsetPainter(*this).PaintBoxDecorationBackground(paint_info, paint_offset);
}
void LayoutFieldset::PaintMask(const PaintInfo& paint_info,
const LayoutPoint& paint_offset) const {
FieldsetPainter(*this).PaintMask(paint_info, paint_offset);
}
} // namespace blink
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