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#pragma once
#include "render_object.hpp"
#include "cru/common/event.hpp"
namespace cru::ui::render {
class CanvasPaintEventArgs {
public:
CanvasPaintEventArgs(platform::graph::IPainter* painter,
const Rect& paint_rect)
: painter_(painter), paint_rect_(paint_rect) {}
CRU_DEFAULT_COPY(CanvasPaintEventArgs)
CRU_DEFAULT_MOVE(CanvasPaintEventArgs)
~CanvasPaintEventArgs() = default;
platform::graph::IPainter* GetPainter() const { return painter_; }
Rect GetPaintRect() const { return paint_rect_; }
private:
platform::graph::IPainter* painter_;
Rect paint_rect_;
};
// The measure logic for `CanvasRenderObject` is that you set a desired size by
// `SetDesiredSize` (not `SetPreferredSize`) and it will compare desired size
// and available size and use the smaller one (by `Min`).
class CanvasRenderObject : public RenderObject {
public:
CanvasRenderObject();
CRU_DELETE_COPY(CanvasRenderObject)
CRU_DELETE_MOVE(CanvasRenderObject)
~CanvasRenderObject();
public:
void Draw(platform::graph::IPainter* painter) override;
RenderObject* HitTest(const Point& point) override;
Size GetDesiredSize() const { return desired_size_; }
// Set the desired size. This is the content size excluding padding and
// margin.
void SetDesiredSize(const Size& new_size) { desired_size_ = new_size; }
IEvent<CanvasPaintEventArgs>* PaintEvent() { return &paint_event_; }
protected:
Size OnMeasureContent(const Size& available_size) override;
void OnLayoutContent(const Rect& content_rect) override;
private:
Size desired_size_{};
Event<CanvasPaintEventArgs> paint_event_;
};
} // namespace cru::ui::render
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