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#pragma once
#include "RenderObject.h"
#include "cru/base/Event.h"
namespace cru::ui::render {
class CanvasPaintEventArgs {
public:
CanvasPaintEventArgs(platform::graphics::IPainter* painter,
const Size& paint_size)
: painter_(painter), paint_size_(paint_size) {}
CRU_DEFAULT_COPY(CanvasPaintEventArgs)
CRU_DEFAULT_MOVE(CanvasPaintEventArgs)
~CanvasPaintEventArgs() = default;
platform::graphics::IPainter* GetPainter() const { return painter_; }
Size GetPaintSize() const { return paint_size_; }
private:
platform::graphics::IPainter* painter_;
Size paint_size_;
};
// Layout logic:
// If no preferred size is set. Then (100, 100) is used and then coerced to
// required range.
class CRU_UI_API CanvasRenderObject : public RenderObject {
public:
CanvasRenderObject();
CRU_DELETE_COPY(CanvasRenderObject)
CRU_DELETE_MOVE(CanvasRenderObject)
~CanvasRenderObject();
public:
RenderObject* HitTest(const Point& point) override;
Size GetDesiredSize() const { return desired_size_; }
IEvent<CanvasPaintEventArgs>* PaintEvent() { return &paint_event_; }
void Draw(platform::graphics::IPainter* painter) override;
protected:
Size OnMeasureContent(const MeasureRequirement& requirement,
const MeasureSize& preferred_size) override;
void OnLayoutContent(const Rect& content_rect) override;
Size OnMeasureContent1(const BoxConstraint& constraint) override;
private:
Size desired_size_{};
Event<CanvasPaintEventArgs> paint_event_;
};
} // namespace cru::ui::render
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