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#pragma once
#include "Base.hpp"
#include "cru/common/Base.hpp"
#include "cru/common/Event.hpp"
#include "cru/platform/graphics/Base.hpp"
#include "cru/platform/graphics/Painter.hpp"
#include "cru/platform/gui/Cursor.hpp"
#include "cru/platform/gui/UiApplication.hpp"
#include "cru/ui/Base.hpp"
#include "cru/ui/controls/Control.hpp"
#include <gsl/pointers>
#include <memory>
#include <optional>
namespace cru::ui::render {
class ScrollRenderObject;
enum class ScrollKind { Absolute, Relative, Page, Line };
struct Scroll {
Direction direction;
ScrollKind kind;
// For absolute, the new scroll position. Otherwise, offset.
float value;
};
enum class ScrollBarAreaKind {
UpArrow, // Line up
DownArrow, // Line down
UpSlot, // Page up
DownSlot, // Page down
Thumb
};
class ScrollBar : public Object {
public:
ScrollBar(gsl::not_null<ScrollRenderObject*> render_object,
Direction direction);
CRU_DELETE_COPY(ScrollBar)
CRU_DELETE_MOVE(ScrollBar)
~ScrollBar() override;
public:
Direction GetDirection() const { return direction_; }
bool IsEnabled() const { return is_enabled_; }
void SetEnabled(bool value);
bool IsExpanded() const { return is_expanded_; }
void SetExpanded(bool value);
void Draw(platform::graphics::IPainter* painter);
IEvent<Scroll>* ScrollAttemptEvent() { return &scroll_attempt_event_; }
void InstallHandlers(controls::Control* control);
void UninstallHandlers() { InstallHandlers(nullptr); }
gsl::not_null<std::shared_ptr<platform::graphics::IBrush>>
GetCollapsedThumbBrush() const;
gsl::not_null<std::shared_ptr<platform::graphics::IBrush>>
GetExpandedThumbBrush() const;
gsl::not_null<std::shared_ptr<platform::graphics::IBrush>>
GetExpandedSlotBrush() const;
gsl::not_null<std::shared_ptr<platform::graphics::IBrush>>
GetExpandedArrowBrush() const;
gsl::not_null<std::shared_ptr<platform::graphics::IBrush>>
GetExpandedArrowBackgroundBrush() const;
protected:
void OnDraw(platform::graphics::IPainter* painter, bool expand);
virtual void DrawUpArrow(platform::graphics::IPainter* painter,
const Rect& area) = 0;
virtual void DrawDownArrow(platform::graphics::IPainter* painter,
const Rect& area) = 0;
std::optional<ScrollBarAreaKind> ExpandedHitTest(const Point& point);
virtual bool IsShowBar() = 0;
virtual std::optional<Rect> GetExpandedAreaRect(
ScrollBarAreaKind area_kind) = 0;
virtual std::optional<Rect> GetCollapsedTriggerExpandAreaRect() = 0;
virtual std::optional<Rect> GetCollapsedThumbRect() = 0;
virtual float CalculateNewScrollPosition(const Rect& thumb_original_rect,
const Point& mouse_offset) = 0;
private:
void SetCursor();
void RestoreCursor();
void BeginAutoCollapseTimer();
void StopAutoCollapseTimer();
void OnMouseLeave();
protected:
gsl::not_null<ScrollRenderObject*> render_object_;
private:
Direction direction_;
bool is_enabled_ = true;
bool is_expanded_ = false;
std::shared_ptr<platform::graphics::IBrush> collapsed_thumb_brush_;
std::shared_ptr<platform::graphics::IBrush> expanded_thumb_brush_;
std::shared_ptr<platform::graphics::IBrush> expanded_slot_brush_;
std::shared_ptr<platform::graphics::IBrush> expanded_arrow_brush_;
std::shared_ptr<platform::graphics::IBrush> expanded_arrow_background_brush_;
Rect move_thumb_thumb_original_rect_;
std::optional<Point> move_thumb_start_;
EventRevokerListGuard event_guard_;
Event<Scroll> scroll_attempt_event_;
std::optional<std::shared_ptr<platform::gui::ICursor>> old_cursor_;
platform::gui::TimerAutoCanceler auto_collapse_timer_canceler_;
};
class HorizontalScrollBar : public ScrollBar {
public:
explicit HorizontalScrollBar(
gsl::not_null<ScrollRenderObject*> render_object);
CRU_DELETE_COPY(HorizontalScrollBar)
CRU_DELETE_MOVE(HorizontalScrollBar)
~HorizontalScrollBar() override = default;
protected:
void DrawUpArrow(platform::graphics::IPainter* painter,
const Rect& area) override;
void DrawDownArrow(platform::graphics::IPainter* painter,
const Rect& area) override;
bool IsShowBar() override;
std::optional<Rect> GetExpandedAreaRect(ScrollBarAreaKind area_kind) override;
std::optional<Rect> GetCollapsedTriggerExpandAreaRect() override;
std::optional<Rect> GetCollapsedThumbRect() override;
float CalculateNewScrollPosition(const Rect& thumb_original_rect,
const Point& mouse_offset) override;
};
class VerticalScrollBar : public ScrollBar {
public:
explicit VerticalScrollBar(gsl::not_null<ScrollRenderObject*> render_object);
CRU_DELETE_COPY(VerticalScrollBar)
CRU_DELETE_MOVE(VerticalScrollBar)
~VerticalScrollBar() override = default;
protected:
void DrawUpArrow(platform::graphics::IPainter* painter,
const Rect& area) override;
void DrawDownArrow(platform::graphics::IPainter* painter,
const Rect& area) override;
bool IsShowBar() override;
std::optional<Rect> GetExpandedAreaRect(ScrollBarAreaKind area_kind) override;
std::optional<Rect> GetCollapsedTriggerExpandAreaRect() override;
std::optional<Rect> GetCollapsedThumbRect() override;
float CalculateNewScrollPosition(const Rect& thumb_original_rect,
const Point& mouse_offset) override;
};
// A delegate to draw scrollbar and register related events.
class ScrollBarDelegate : public Object {
public:
explicit ScrollBarDelegate(gsl::not_null<ScrollRenderObject*> render_object);
CRU_DELETE_COPY(ScrollBarDelegate)
CRU_DELETE_MOVE(ScrollBarDelegate)
~ScrollBarDelegate() override = default;
public:
bool IsHorizontalBarEnabled() const { return horizontal_bar_.IsEnabled(); }
void SetHorizontalBarEnabled(bool value) {
horizontal_bar_.SetEnabled(value);
}
bool IsVerticalBarEnabled() const { return horizontal_bar_.IsEnabled(); }
void SetVerticalBarEnabled(bool value) { horizontal_bar_.SetEnabled(value); }
IEvent<Scroll>* ScrollAttemptEvent() { return &scroll_attempt_event_; }
void DrawScrollBar(platform::graphics::IPainter* painter);
void InstallHandlers(controls::Control* control);
void UninstallHandlers() { InstallHandlers(nullptr); }
private:
gsl::not_null<ScrollRenderObject*> render_object_;
HorizontalScrollBar horizontal_bar_;
VerticalScrollBar vertical_bar_;
Event<Scroll> scroll_attempt_event_;
};
} // namespace cru::ui::render
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