ResizeBehavior.h

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#pragma once
 
#include "UI/Behavior/IBehavior.h"
 
namespace z8::ui {
 
enum class ResizeRegion {
  None,
  Left,
  Right,
  Top,
  Bottom,
  TopLeft,
  TopRight,
  BottomLeft,
  BottomRight
};
 
struct ResizeProperty {
  bool Enabled = true;
  float Border = 6.0f;
  float MinWidth = 120.0f;
  float MinHeight = 80.0f;
};
 
class ResizeBehavior final : public IBehavior {
private:
  ResizeRegion ActiveRegion = ResizeRegion::None;
  bool InteractiveGeometry = false;
  float CurrentLeft = 0.0f;
  float CurrentTop = 0.0f;
  float CurrentWidth = 0.0f;
  float CurrentHeight = 0.0f;
  BehaviorNode *ResizeTarget = nullptr;
public:
  static constexpr int DefaultPriority = 200;
  ResizeProperty Properties;
 
  ResizeBehavior() : IBehavior(DefaultPriority) {}
 
  void SetProperties(const ResizeProperty &properties);
  bool SetProperty(const std::string &name, const std::string &value) override;
  ResizeRegion HitTest(MouseMovArgs args) const;
  bool IsResizing() const { return ActiveRegion != ResizeRegion::None; }
  ResizeRegion GetActiveRegion() const { return ActiveRegion; }
  BehaviorNode *GetResizeTarget() const { return ResizeTarget; }
  bool HasInteractiveGeometry() const { return InteractiveGeometry; }
 
  EventReply OnMouseDown(MouseMovArgs args) override;
  EventReply OnMouseDrag(MouseMovArgs args) override;
  EventReply OnMouseUp(MouseMovArgs args) override;
  void OnPointerCaptureLost() override {
    ActiveRegion = ResizeRegion::None;
    ResizeTarget = nullptr;
  }
  MouseCursor GetMouseCursor(MouseMovArgs args) const override;
  void OnAttached() override;
 
private:
  static MouseCursor CursorForRegion(ResizeRegion region);
  void ApplyMinimumSize() const;
};
 
} // namespace z8::ui