Disable Touchpad preferences.

Show warning in the touchpad preference dialog box when user is not connected and also disable touchpad preferences except touchpad view.

Change-Id: I52b80e834ee3bb37d568aa065942eae405001343
Reviewed-on: https://review.haiku-os.org/c/1344
Reviewed-by: Adrien Destugues <[email protected]>

src/preferences/touchpad/TouchpadPref.h

@@ -37,7 +37,8 @@ public:
 
 			touchpad_settings&	Settings()
 									{ return fSettings; }
-
+			bool 				IsTouchpadConnected()
+									{ return fConnected; }
 			status_t			UpdateSettings();
 
 private:

src/preferences/touchpad/TouchpadPrefView.cpp

@@ -271,6 +271,13 @@ TouchpadPrefView::TouchpadPrefView()
 	SetupView();
 	// set view values
 	SetValues(&fTouchpadPref.Settings());
+	if (fTouchpadPref.IsTouchpadConnected() == false) {
+		DisablePref();
+		fShowWarning->SetText(B_TRANSLATE("No touchpad found, the settings "
+			"will have no effect."));
+	}
+	else
+		fShowWarning->Hide();
 }
 
 
@@ -457,8 +464,11 @@ TouchpadPrefView::SetupView()
 		new BMessage(REVERT_SETTINGS));
 	fRevertButton->SetEnabled(false);
 
+	fShowWarning = new BStringView("warning", "");
+
 	BLayoutBuilder::Group<>(this, B_VERTICAL)
 		.SetInsets(B_USE_WINDOW_SPACING)
+		.Add(fShowWarning)
 		.Add(scrollBox)
 		.Add(tapBox)
 		.AddGroup(B_HORIZONTAL)
@@ -485,3 +495,17 @@ TouchpadPrefView::SetValues(touchpad_settings* settings)
 	fScrollAccelSlider->SetValue(settings->scroll_acceleration);
 	fTapSlider->SetValue(settings->tapgesture_sensibility);
 }
+
+
+void
+TouchpadPrefView::DisablePref()
+{
+	fTwoFingerBox->SetEnabled(false);
+	fTwoFingerHorizontalBox->SetEnabled(false);
+	fRevertButton->SetEnabled(false);
+	fDefaultButton->SetEnabled(false);
+	fTapSlider->SetEnabled(false);
+	fScrollAccelSlider->SetEnabled(false);
+	fScrollStepXSlider->SetEnabled(false);
+	fScrollStepYSlider->SetEnabled(false);
+}

src/preferences/touchpad/TouchpadPrefView.h

@@ -17,6 +17,7 @@
 #include <Slider.h>
 #include <View.h>
 #include <GroupView.h>
+#include <StringView.h>
 
 #include "TouchpadPref.h"
 #include "touchpad_settings.h"
@@ -91,6 +92,8 @@ public:
 			void			SetValues(touchpad_settings *settings);
 
 private:
+			void 			DisablePref();
+
 			TouchpadView*	fTouchpadView;
 			BCheckBox*		fTwoFingerBox;
 			BCheckBox*		fTwoFingerHorizontalBox;
@@ -100,6 +103,7 @@ private:
 			BSlider*		fTapSlider;
 			BButton*		fDefaultButton;
 			BButton*		fRevertButton;
+			BStringView*	fShowWarning;
 
 			TouchpadPref	fTouchpadPref;
 };