Add setting callbacks for Camera and TouchControls (#15700)

src/gui/touchcontrols.cpp

@@ -201,19 +201,40 @@ static EKEY_CODE id_to_keycode(touch_gui_button_id id)
 }
 
 
+static const char *setting_names[] = {
+	"touchscreen_threshold", "touch_long_tap_delay",
+	"fixed_virtual_joystick", "virtual_joystick_triggers_aux1",
+	"touch_layout",
+};
+
 TouchControls::TouchControls(IrrlichtDevice *device, ISimpleTextureSource *tsrc):
 		m_device(device),
 		m_guienv(device->getGUIEnvironment()),
 		m_receiver(device->getEventReceiver()),
 		m_texturesource(tsrc)
+{
+	m_screensize = m_device->getVideoDriver()->getScreenSize();
+	m_button_size = ButtonLayout::getButtonSize(m_screensize);
+
+	readSettings();
+	for (auto name : setting_names)
+		g_settings->registerChangedCallback(name, settingChangedCallback, this);
+}
+
+void TouchControls::settingChangedCallback(const std::string &name, void *data)
+{
+	static_cast<TouchControls *>(data)->readSettings();
+}
+
+void TouchControls::readSettings()
 {
 	m_touchscreen_threshold = g_settings->getU16("touchscreen_threshold");
 	m_long_tap_delay = g_settings->getU16("touch_long_tap_delay");
 	m_fixed_joystick = g_settings->getBool("fixed_virtual_joystick");
 	m_joystick_triggers_aux1 = g_settings->getBool("virtual_joystick_triggers_aux1");
 
-	m_screensize = m_device->getVideoDriver()->getScreenSize();
-	m_button_size = ButtonLayout::getButtonSize(m_screensize);
+	// Note that "fixed_virtual_joystick" and "virtual_joystick_triggers_aux1"
+	// also affect the layout.
 	applyLayout(ButtonLayout::loadFromSettings());
 }
 
@@ -314,6 +335,7 @@ void TouchControls::applyLayout(const ButtonLayout &layout)
 
 TouchControls::~TouchControls()
 {
+	g_settings->deregisterAllChangedCallbacks(this);
 	releaseAll();
 }
 

src/gui/touchcontrols.h

@@ -120,19 +120,31 @@ public:
 	bool isStatusTextOverriden() { return m_overflow_open; }
 	IGUIStaticText *getStatusText() { return m_status_text.get(); }
 
-	ButtonLayout getLayout() { return m_layout; }
-	void applyLayout(const ButtonLayout &layout);
-
 private:
 	IrrlichtDevice *m_device = nullptr;
 	IGUIEnvironment *m_guienv = nullptr;
 	IEventReceiver *m_receiver = nullptr;
 	ISimpleTextureSource *m_texturesource = nullptr;
+	bool m_visible = true;
+
+	// changes to these two values are handled in TouchControls::step
 	v2u32 m_screensize;
 	s32 m_button_size;
+
+	// cached settings
 	double m_touchscreen_threshold;
 	u16 m_long_tap_delay;
-	bool m_visible = true;
+	bool m_fixed_joystick;
+	bool m_joystick_triggers_aux1;
+
+	static void settingChangedCallback(const std::string &name, void *data);
+	void readSettings();
+
+	ButtonLayout m_layout;
+	void applyLayout(const ButtonLayout &layout);
+
+	// not read from a setting, but set by Game via setUseCrosshair
+	bool m_draw_crosshair = false;
 
 	std::unordered_map<u16, recti> m_hotbar_rects;
 	std::optional<u16> m_hotbar_selection = std::nullopt;
@@ -165,9 +177,6 @@ private:
 	float m_joystick_direction = 0.0f; // assume forward
 	float m_joystick_speed = 0.0f; // no movement
 	bool m_joystick_status_aux1 = false;
-	bool m_fixed_joystick = false;
-	bool m_joystick_triggers_aux1 = false;
-	bool m_draw_crosshair = false;
 	std::shared_ptr<IGUIImage> m_joystick_btn_off;
 	std::shared_ptr<IGUIImage> m_joystick_btn_bg;
 	std::shared_ptr<IGUIImage> m_joystick_btn_center;
@@ -237,8 +246,6 @@ private:
 
 	bool m_place_pressed = false;
 	u64 m_place_pressed_until = 0;
-
-	ButtonLayout m_layout;
 };
 
 extern TouchControls *g_touchcontrols;

src/gui/touchscreeneditor.cpp

@@ -23,10 +23,7 @@ GUITouchscreenLayout::GUITouchscreenLayout(gui::IGUIEnvironment* env,
 	GUIModalMenu(env, parent, id, menumgr),
 	m_tsrc(tsrc)
 {
-	if (g_touchcontrols)
-		m_layout = g_touchcontrols->getLayout();
-	else
-		m_layout = ButtonLayout::loadFromSettings();
+	m_layout = ButtonLayout::loadFromSettings();
 
 	m_gui_help_text = grab_gui_element<IGUIStaticText>(Environment->addStaticText(
 			L"", core::recti(), false, false, this, -1));
@@ -378,8 +375,6 @@ bool GUITouchscreenLayout::OnEvent(const SEvent& event)
 			}
 
 			if (event.GUIEvent.Caller == m_gui_done_btn.get()) {
-				if (g_touchcontrols)
-					g_touchcontrols->applyLayout(m_layout);
 				std::ostringstream oss;
 				m_layout.serializeJson(oss);
 				g_settings->set("touch_layout", oss.str());