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#include "frame_layout.hpp"
namespace cru::ui::controls
{
FrameLayout::FrameLayout() = default;
FrameLayout::~FrameLayout() = default;
StringView FrameLayout::GetControlType() const
{
return control_type;
}
Size FrameLayout::OnMeasureContent(const Size& available_size, const AdditionalMeasureInfo& additional_info)
{
auto max_child_size = Size::Zero();
for (auto control: GetChildren())
{
control->Measure(available_size, additional_info);
const auto&& size = control->GetDesiredSize();
if (max_child_size.width < size.width)
max_child_size.width = size.width;
if (max_child_size.height < size.height)
max_child_size.height = size.height;
}
// coerce size fro stretch.
for (auto control: GetChildren())
{
auto size = control->GetDesiredSize();
const auto layout_params = control->GetLayoutParams();
if (layout_params->width.mode == MeasureMode::Stretch)
size.width = max_child_size.width;
if (layout_params->height.mode == MeasureMode::Stretch)
size.height = max_child_size.height;
control->SetDesiredSize(size);
}
return max_child_size;
}
void FrameLayout::OnLayoutContent(const Rect& rect, const AdditionalLayoutInfo& additional_info)
{
for (auto control: GetChildren())
{
const auto layout_params = control->GetLayoutParams();
const auto size = control->GetDesiredSize();
auto&& calculate_anchor = [](const float anchor, const Alignment alignment, const float layout_length, const float control_length) -> float
{
switch (alignment)
{
case Alignment::Center:
return anchor + (layout_length - control_length) / 2;
case Alignment::Start:
return anchor;
case Alignment::End:
return anchor + layout_length - control_length;
default:
UnreachableCode();
}
};
control->Layout(Rect(Point(
calculate_anchor(rect.left, layout_params->width.alignment, rect.width, size.width),
calculate_anchor(rect.top, layout_params->height.alignment, rect.height, size.height)
), size), additional_info);
}
}
}
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