make click() virtual

Author: tobozo

libraries/USB/src/USBHIDMouse.h

@@ -65,7 +65,8 @@ class USBHIDMouseBase: public USBHIDDevice {
     template <typename T> bool sendReport(T report) { return hid.SendReport( HID_REPORT_ID_MOUSE, &report, _type->report_size ); };
     // internal use
     uint16_t _onGetDescriptor(uint8_t* buffer);
-    virtual void buttons(uint8_t b);
+    virtual void click(uint8_t b) = 0;
+    virtual void buttons(uint8_t b) = 0;
 protected:
     USBHID hid;
     uint8_t _buttons;
@@ -77,7 +78,7 @@ class USBHIDRelativeMouse: public USBHIDMouseBase {
 public:
     USBHIDRelativeMouse(void): USBHIDMouseBase(&HIDMouseRel) { }
     void move(int8_t x, int8_t y, int8_t wheel = 0, int8_t pan = 0);
-    void click(uint8_t b = MOUSE_LEFT);
+    void click(uint8_t b = MOUSE_LEFT) override;
     void buttons(uint8_t b) override;
 };
 
@@ -86,7 +87,7 @@ class USBHIDAbsoluteMouse: public USBHIDMouseBase {
 public:
     USBHIDAbsoluteMouse(void): USBHIDMouseBase(&HIDMouseAbs) { }
     void move(int16_t x, int16_t y, int8_t wheel = 0, int8_t pan = 0);
-    void click(uint8_t b = MOUSE_LEFT);
+    void click(uint8_t b = MOUSE_LEFT) override;
     void buttons(uint8_t b) override;
 private:
     int16_t _lastx = 0;