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#include "cru/ui/render/StackLayoutRenderObject.h"
#include "cru/common/Logger.h"
#include "cru/ui/render/LayoutHelper.h"
#include "cru/ui/render/MeasureRequirement.h"
#include <algorithm>
namespace cru::ui::render {
void StackLayoutRenderObject::SetDefaultHorizontalAlignment(
Alignment alignment) {
default_horizontal_alignment_ = alignment;
InvalidateLayout();
}
void StackLayoutRenderObject::SetDefaultVertialAlignment(Alignment alignment) {
default_vertical_alignment_ = alignment;
InvalidateLayout();
}
Size StackLayoutRenderObject::OnMeasureContent(
const MeasureRequirement& requirement, const MeasureSize& preferred_size) {
Size child_max_size;
for (int i = 0; i < GetChildCount(); i++) {
auto child = GetChildAt(i);
child->Measure(
MeasureRequirement(requirement.max, MeasureSize::NotSpecified()),
MeasureSize::NotSpecified());
const auto size = child->GetDesiredSize();
child_max_size.width = std::max(child_max_size.width, size.width);
child_max_size.height = std::max(child_max_size.height, size.height);
}
child_max_size = Max(preferred_size.GetSizeOr0(), child_max_size);
child_max_size = Max(requirement.min.GetSizeOr0(), child_max_size);
for (Index i = 0; i < GetChildCount(); ++i) {
auto child_layout_data = GetChildLayoutDataAt(i);
auto horizontal_stretch =
child_layout_data.horizontal.value_or(default_horizontal_alignment_) ==
Alignment::Stretch;
auto vertical_stretch =
child_layout_data.vertical.value_or(default_vertical_alignment_) ==
Alignment::Stretch;
if (horizontal_stretch || vertical_stretch) {
auto child = GetChildAt(i);
auto child_size = child->GetDesiredSize();
MeasureRequirement child_requirement(child_size, child_size);
if (horizontal_stretch) {
child_requirement.min.width = child_requirement.max.width =
child_max_size.width;
}
if (vertical_stretch) {
child_requirement.min.height = child_requirement.max.height =
child_max_size.height;
}
child->Measure(child_requirement, MeasureSize::NotSpecified());
}
}
return child_max_size;
}
void StackLayoutRenderObject::OnLayoutContent(const Rect& content_rect) {
const auto count = GetChildCount();
for (int i = 0; i < count; i++) {
const auto child = GetChildAt(i);
const auto& layout_data = GetChildLayoutDataAt(i);
const auto& size = child->GetDesiredSize();
child->Layout(Point{
CalculateAnchorByAlignment(
layout_data.horizontal.value_or(default_horizontal_alignment_),
content_rect.left, content_rect.width, size.width),
CalculateAnchorByAlignment(
layout_data.vertical.value_or(default_vertical_alignment_),
content_rect.top, content_rect.height, size.height)});
}
}
} // namespace cru::ui::render
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