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#pragma once
#include <unordered_set>
#include "base.hpp"
#include "ui_base.hpp"
namespace cru::ui
{
class Control;
class Window;
enum class Alignment
{
Center,
Start,
End
};
enum class MeasureMode
{
Exactly,
Content,
Stretch
};
enum class RectRange
{
Content, // content excluding padding, border and margin
Padding, // only including content and padding
HalfBorder, // including content, padding and half border
FullBorder, // including content, padding and full border
Margin // including content, padding, border and margin
};
struct LayoutSideParams final
{
constexpr static LayoutSideParams Exactly(const float length, const Alignment alignment = Alignment::Center)
{
return LayoutSideParams(MeasureMode::Exactly, length, alignment);
}
constexpr static LayoutSideParams Content(const Alignment alignment = Alignment::Center)
{
return LayoutSideParams(MeasureMode::Content, 0, alignment);
}
constexpr static LayoutSideParams Stretch(const Alignment alignment = Alignment::Center)
{
return LayoutSideParams(MeasureMode::Stretch, 0, alignment);
}
constexpr LayoutSideParams() = default;
constexpr explicit LayoutSideParams(const MeasureMode mode, const float length, const Alignment alignment)
: length(length), mode(mode), alignment(alignment)
{
}
constexpr bool Validate() const
{
if (length < 0.0)
return false;
if (min.has_value() && min.value() < 0.0)
return false;
if (max.has_value() && max.value() < 0.0)
return false;
if (min.has_value() && max.has_value() && min.value() > max.value())
return false;
return true;
}
// only used in exactly mode, specify the exactly side length of content.
float length = 0.0;
MeasureMode mode = MeasureMode::Content;
Alignment alignment = Alignment::Center;
// min and max specify the min/max side length of content.
// they are used as hint and respect the actual size that content needs.
// when mode is exactly, length is coerced into the min-max range.
std::optional<float> min = std::nullopt;
std::optional<float> max = std::nullopt;
};
struct BasicLayoutParams final
{
BasicLayoutParams() = default;
BasicLayoutParams(const BasicLayoutParams&) = default;
BasicLayoutParams(BasicLayoutParams&&) = default;
BasicLayoutParams& operator = (const BasicLayoutParams&) = default;
BasicLayoutParams& operator = (BasicLayoutParams&&) = default;
~BasicLayoutParams() = default;
bool Validate() const
{
return width.Validate() && height.Validate() && margin.Validate() && padding.Validate();
}
LayoutSideParams width;
LayoutSideParams height;
Thickness padding;
Thickness margin;
};
class LayoutManager : public Object
{
public:
static LayoutManager* GetInstance();
private:
LayoutManager() = default;
public:
LayoutManager(const LayoutManager& other) = delete;
LayoutManager(LayoutManager&& other) = delete;
LayoutManager& operator=(const LayoutManager& other) = delete;
LayoutManager& operator=(LayoutManager&& other) = delete;
~LayoutManager() override = default;
//*************** region: position cache ***************
//Mark position cache of the control and its descendants invalid,
//(which is saved as an auto-managed list internal)
//and send a message to refresh them.
void InvalidateControlPositionCache(Control* control);
//Refresh position cache of the control and its descendants whose cache
//has been marked as invalid.
void RefreshInvalidControlPositionCache();
//Refresh position cache of the control and its descendants immediately.
static void RefreshControlPositionCache(Control* control);
private:
static void RefreshControlPositionCacheInternal(Control* control, const Point& parent_lefttop_absolute);
private:
std::unordered_set<Control*> cache_invalid_controls_;
std::unordered_set<Window*> layout_invalid_windows_;
};
}
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