DragBehavior.h

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#pragma once
 
#include "UI/Behavior/IBehavior.h"
 
namespace z8::ui {
 
class BaseNode;
 
enum class DragRegion { TitleBar, Anywhere };
 
struct DragProperty {
  bool Enabled = true;
  DragRegion Region = DragRegion::TitleBar;
};
 
class DragBehavior final : public IBehavior {
private:
  BaseNode *Handle = nullptr;
  bool Dragging = false;
  bool GestureMoved = false;
  bool InteractiveGeometry = false;
  bool PreviewOnly = false;
  float CurrentLeft = 0.0f;
  float CurrentTop = 0.0f;
  float CurrentWidth = 0.0f;
  float CurrentHeight = 0.0f;
public:
  DragProperty Properties;
  static constexpr int DefaultPriority = 100;
 
  DragBehavior() : IBehavior(DefaultPriority) {}
  bool SetProperty(const std::string &name, const std::string &value) override;
  void SetHandle(BaseNode *handle) { Handle = handle; }
 
  bool IsDragging() const { return Dragging; }
  bool HasGestureMoved() const { return GestureMoved; }
  bool HasInteractiveGeometry() const { return InteractiveGeometry; }
 
  EventReply OnMouseDown(MouseMovArgs args) override;
  EventReply OnMouseDrag(MouseMovArgs args) override;
  EventReply OnMouseUp(MouseMovArgs args) override;
  void SetPreviewOnly(bool previewOnly) { PreviewOnly = previewOnly; }
  void OnPointerCaptureLost() override {
    Dragging = false;
    GestureMoved = false;
  }
};
 
} // namespace z8::ui