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#pragma once
#include "system_headers.h"
#include <unordered_set>
#include "base.h"
#include "ui_base.h"
namespace cru
{
namespace ui
{
class Control;
enum class Alignment
{
Center,
Start,
End
};
enum class MeasureMode
{
Exactly,
Content,
Stretch
};
struct LayoutLength final
{
constexpr static LayoutLength Exactly(const float length, const Alignment alignment = Alignment::Center)
{
return LayoutLength(MeasureMode::Exactly, length, alignment);
}
constexpr static LayoutLength Content(const Alignment alignment = Alignment::Center)
{
return LayoutLength(MeasureMode::Content, 0, alignment);
}
constexpr static LayoutLength Stretch(const Alignment alignment = Alignment::Center)
{
return LayoutLength(MeasureMode::Stretch, 0, alignment);
}
constexpr LayoutLength() = default;
constexpr explicit LayoutLength(const MeasureMode mode, const float length, const Alignment alignment)
: length(length), mode(mode), alignment(alignment)
{
}
constexpr bool Validate() const
{
if (mode == MeasureMode::Exactly && length < 0.0)
{
#ifdef CRU_DEBUG
::OutputDebugStringW(L"LayoutLength validation error: mode is Exactly but length is less than 0.\n");
#endif
return false;
}
return true;
}
float length = 0.0;
MeasureMode mode = MeasureMode::Content;
Alignment alignment = Alignment::Center;
};
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
{
if (!width.Validate())
{
#ifdef CRU_DEBUG
::OutputDebugStringW(L"Width(LayoutLength) is not valid.");
#endif
return false;
}
if (!height.Validate())
{
#ifdef CRU_DEBUG
::OutputDebugStringW(L"Height(LayoutLength) is not valid.");
#endif
return false;
}
return true;
}
LayoutLength width;
LayoutLength height;
};
class LayoutManager : public Object
{
public:
static LayoutManager* GetInstance();
public:
LayoutManager() = default;
LayoutManager(const LayoutManager& other) = delete;
LayoutManager(LayoutManager&& other) = delete;
LayoutManager& operator=(const LayoutManager& other) = delete;
LayoutManager& operator=(LayoutManager&& other) = delete;
~LayoutManager() override = default;
//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_;
};
}
}
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