Add onVisibleChanged() method to IMonitorHandler

Author: adazem009

include/scratchcpp/imonitorhandler.h

@@ -15,6 +15,8 @@ class LIBSCRATCHCPP_EXPORT IMonitorHandler
         virtual ~IMonitorHandler() { }
 
         virtual void init(Monitor *) = 0;
+
+        virtual void onVisibleChanged(bool visible) = 0;
 };
 
 } // namespace libscratchcpp

src/scratch/monitor.cpp

@@ -126,6 +126,9 @@ bool Monitor::visible() const
 void Monitor::setVisible(bool visible)
 {
     impl->visible = visible;
+
+    if (impl->iface)
+        impl->iface->onVisibleChanged(visible);
 }
 
 /*! Returns the minimum value of the monitor's slider. */

test/mocks/monitorhandlermock.h

@@ -9,4 +9,6 @@ class MonitorHandlerMock : public IMonitorHandler
 {
     public:
         MOCK_METHOD(void, init, (Monitor *), (override));
+
+        MOCK_METHOD(void, onVisibleChanged, (bool), (override));
 };

test/scratch_classes/monitor_test.cpp

@@ -127,6 +127,22 @@ TEST(MonitorTest, Visible)
 
     monitor.setVisible(true);
     ASSERT_TRUE(monitor.visible());
+
+    MonitorHandlerMock handler;
+    EXPECT_CALL(handler, init);
+    monitor.setInterface(&handler);
+
+    EXPECT_CALL(handler, onVisibleChanged(true));
+    monitor.setVisible(true);
+    ASSERT_TRUE(monitor.visible());
+
+    EXPECT_CALL(handler, onVisibleChanged(false));
+    monitor.setVisible(false);
+    ASSERT_FALSE(monitor.visible());
+
+    EXPECT_CALL(handler, onVisibleChanged(false));
+    monitor.setVisible(false);
+    ASSERT_FALSE(monitor.visible());
 }
 
 TEST(MonitorTest, SliderMin)