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1 files changed, 86 insertions, 0 deletions

diff --git a/include/cru/ui/ClickDetector.hpp b/include/cru/ui/ClickDetector.hpp
new file mode 100644
index 00000000..f5fd3d8f
--- /dev/null
+++ b/include/cru/ui/ClickDetector.hpp
@@ -0,0 +1,86 @@
+#pragma once
+#include "Control.hpp"
+
+
+namespace cru::ui {
+class ClickEventArgs : Object {
+ public:
+  ClickEventArgs(Control* sender, const Point& down_point,
+                 const Point& up_point, MouseButton button)
+      : sender_(sender),
+        down_point_(down_point),
+        up_point_(up_point),
+        button_(button) {}
+
+  CRU_DEFAULT_COPY(ClickEventArgs)
+  CRU_DEFAULT_MOVE(ClickEventArgs)
+
+  ~ClickEventArgs() override = default;
+
+  Control* GetSender() const { return sender_; }
+  Point GetDownPoint() const { return down_point_; }
+  Point GetUpPoint() const { return up_point_; }
+  MouseButton GetButton() const { return button_; }
+
+ private:
+  Control* sender_;
+  Point down_point_;
+  Point up_point_;
+  MouseButton button_;
+};
+
+enum class ClickState {
+  None,          // Mouse is outside the control.
+  Hover,         // Mouse hovers on the control but not pressed
+  Press,         // Mouse is pressed and if released click is done.
+  PressInactive  // Mouse is pressed but if released click is canceled.
+};
+
+class ClickDetector : public Object {
+ public:
+  explicit ClickDetector(Control* control);
+
+  CRU_DELETE_COPY(ClickDetector)
+  CRU_DELETE_MOVE(ClickDetector)
+
+  ~ClickDetector() override = default;
+
+  Control* GetControl() const { return control_; }
+
+  ClickState GetState() const { return state_; }
+
+  // Default is enable.
+  bool IsEnabled() const { return enable_; }
+  // If disable when user is pressing, the pressing is deactivated.
+  void SetEnabled(bool enable);
+
+  // Default is left and right.
+  MouseButton GetTriggerButton() const { return trigger_button_; }
+  // If unset the trigger button when user is pressing, the pressing is
+  // deactivated.
+  void SetTriggerButton(MouseButton trigger_button);
+
+  IEvent<ClickEventArgs>* ClickEvent() { return &event_; }
+
+  IEvent<ClickState>* StateChangeEvent() { return &state_change_event_; }
+
+ private:
+  void SetState(ClickState state);
+
+ private:
+  Control* control_;
+
+  ClickState state_;
+
+  bool enable_ = true;
+  MouseButton trigger_button_ = mouse_buttons::left | mouse_buttons::right;
+
+  Event<ClickEventArgs> event_;
+  Event<ClickState> state_change_event_;
+
+  std::vector<EventRevokerGuard> event_rovoker_guards_;
+
+  Point down_point_;
+  MouseButton button_;
+};
+}  // namespace cru::ui