ifdef'd windows focus calls, remove unnecessary meter refreshes

src/AppFrame.cpp

@@ -1779,10 +1779,11 @@ void AppFrame::refreshGainUI() {
     gainCanvas->Refresh();
 }
 
-
+#ifdef _WIN32
 bool AppFrame::canFocus() {
 	return (!wxGetApp().isDeviceSelectorOpen() && (!modemProps || !modemProps->isMouseInView()));
 }
+#endif
 
 FrequencyDialog::FrequencyDialogTarget AppFrame::getFrequencyDialogTarget() {
     FrequencyDialog::FrequencyDialogTarget target = FrequencyDialog::FrequencyDialogTarget::FDIALOG_TARGET_DEFAULT;

src/AppFrame.h

@@ -96,8 +96,10 @@ public:
     FrequencyDialog::FrequencyDialogTarget getFrequencyDialogTarget();
     void refreshGainUI();
 
+#ifdef _WIN32
 	bool canFocus();
-        
+#endif
+    
 private:
     void OnMenu(wxCommandEvent& event);
     void OnClose(wxCloseEvent& event);

src/visual/MeterCanvas.cpp

@@ -126,18 +126,15 @@ void MeterCanvas::OnMouseDown(wxMouseEvent& event) {
     InteractiveCanvas::OnMouseDown(event);
     userInputValue = mouseTracker.getMouseY() * (level_max-level_min) + level_min;
     mouseTracker.setHorizDragLock(true);
-    Refresh();
 }
 
 void MeterCanvas::OnMouseReleased(wxMouseEvent& event) {
     InteractiveCanvas::OnMouseReleased(event);
     userInputValue = mouseTracker.getMouseY() * (level_max-level_min) + level_min;
-    Refresh();
 }
 
 void MeterCanvas::OnMouseRightDown(wxMouseEvent& event) {
     InteractiveCanvas::OnMouseRightDown(event);
-    Refresh();
 }
 
 void MeterCanvas::OnMouseRightReleased(wxMouseEvent& event) {
@@ -145,7 +142,6 @@ void MeterCanvas::OnMouseRightReleased(wxMouseEvent& event) {
 	if (showUserInput) {
 		userInputValue = level - level * 0.02;
 	}
-	Refresh();
 }
 
 void MeterCanvas::OnMouseWheelMoved(wxMouseEvent& event) {
@@ -169,8 +165,6 @@ void MeterCanvas::OnMouseWheelMoved(wxMouseEvent& event) {
 	}
 
 	userInputValue = currentValue;
-	
-	Refresh();
 }
 
 void MeterCanvas::OnMouseLeftWindow(wxMouseEvent& event) {
@@ -182,10 +176,11 @@ void MeterCanvas::OnMouseLeftWindow(wxMouseEvent& event) {
 void MeterCanvas::OnMouseEnterWindow(wxMouseEvent& event) {
     InteractiveCanvas::mouseTracker.OnMouseEnterWindow(event);
     SetCursor(wxCURSOR_CROSS);
-    Refresh();
+#ifdef _WIN32
 	if (wxGetApp().getAppFrame()->canFocus()) {
 		this->SetFocus();
 	}
+#endif
 }
 
 void MeterCanvas::setHelpTip(std::string tip) {

src/visual/SpectrumCanvas.cpp

@@ -259,11 +259,13 @@ void SpectrumCanvas::OnMouseReleased(wxMouseEvent& event) {
 void SpectrumCanvas::OnMouseEnterWindow(wxMouseEvent& event) {
     InteractiveCanvas::OnMouseEnterWindow(event);
     SetCursor(wxCURSOR_SIZEWE);
+#ifdef _WIN32
 	if (waterfallCanvas) {
 		if (wxGetApp().getAppFrame()->canFocus()) {
 			this->SetFocus();
 		}
 	}
+#endif
 }
 
 void SpectrumCanvas::OnMouseLeftWindow(wxMouseEvent& event) {

src/visual/TuningCanvas.cpp

@@ -410,9 +410,11 @@ void TuningCanvas::OnMouseEnterWindow(wxMouseEvent& event) {
     hoverIndex = 0;
     hoverState = TUNING_HOVER_NONE;
     lastPPM = currentPPM = wxGetApp().getPPM();
+#ifdef _WIN32
 	if (wxGetApp().getAppFrame()->canFocus()) {
 		this->SetFocus();
 	}
+#endif
 }
 
 void TuningCanvas::setHelpTip(std::string tip) {

src/visual/WaterfallCanvas.cpp

@@ -852,9 +852,11 @@ void WaterfallCanvas::OnMouseLeftWindow(wxMouseEvent& event) {
 void WaterfallCanvas::OnMouseEnterWindow(wxMouseEvent& event) {
     InteractiveCanvas::OnMouseEnterWindow(event);
     SetCursor(wxCURSOR_CROSS);
+#ifdef _WIN32
 	if (wxGetApp().getAppFrame()->canFocus()) {
 		this->SetFocus();
 	}
+#endif
 }
 
 void WaterfallCanvas::OnMouseRightDown(wxMouseEvent& event) {