Use X11 global hotkeys on X11 when possible to prevent clashing with keys used by other applications

include/GlobalHotkeys.hpp

@@ -4,6 +4,10 @@
 #include <functional>
 #include <string>
 
+namespace mgl {
+    class Event;
+}
+
 namespace gsr {
     struct Hotkey {
         uint64_t key = 0;
@@ -24,5 +28,7 @@ namespace gsr {
         virtual void unbind_all_keys() {}
         virtual bool bind_action(const std::string &id, GlobalHotkeyCallback callback) { (void)id; (void)callback; return false; };
         virtual void poll_events() = 0;
+        // Returns true if the event wasn't consumed (if the event didn't match a key that has been bound)
+        virtual bool on_event(mgl::Event &event) { (void)event; return true; }
     };
 }

include/GlobalHotkeysX11.hpp

@@ -12,12 +12,15 @@ namespace gsr {
         GlobalHotkeysX11& operator=(const GlobalHotkeysX11&) = delete;
         ~GlobalHotkeysX11() override;
 
+        // Hotkey key is a KeySym (XK_z for example) and modifiers is a bitmask of X11 modifier masks (for example ShiftMask | Mod1Mask)
         bool bind_key_press(Hotkey hotkey, const std::string &id, GlobalHotkeyCallback callback) override;
         void unbind_key_press(const std::string &id) override;
         void unbind_all_keys() override;
         void poll_events() override;
+        bool on_event(mgl::Event &event) override;
     private:
-        void call_hotkey_callback(Hotkey hotkey) const;
+        // Returns true if a key bind has been registered for the hotkey
+        bool call_hotkey_callback(Hotkey hotkey) const;
     private:
         struct HotkeyData {
             Hotkey hotkey;

include/Overlay.hpp

@@ -18,6 +18,7 @@
 
 namespace gsr {
     class DropdownButton;
+    class GlobalHotkeys;
 
     enum class RecordingStatus {
         NONE,
@@ -40,7 +41,7 @@ namespace gsr {
         Overlay& operator=(const Overlay&) = delete;
         ~Overlay();
 
-        void handle_events();
+        void handle_events(gsr::GlobalHotkeys *global_hotkeys);
         void on_event(mgl::Event &event);
         // Returns false if not visible
         bool draw();