genbindings: generate signal connection handlers for overloads

cmd/genbindings/emitcabi.go

@@ -119,11 +119,16 @@ func emitParametersCpp(m CppMethod) string {
 	return strings.Join(tmp, `, `)
 }
 
-func emitParameterTypesCpp(m CppMethod) string {
+func emitParameterTypesCpp(m CppMethod, includeHidden bool) string {
 	tmp := make([]string, 0, len(m.Parameters))
 	for _, p := range m.Parameters {
 		tmp = append(tmp, p.RenderTypeQtCpp())
 	}
+	if includeHidden {
+		for _, p := range m.HiddenParams {
+			tmp = append(tmp, p.RenderTypeQtCpp())
+		}
+	}
 
 	return strings.Join(tmp, `, `)
 }
@@ -457,7 +462,7 @@ extern "C" {
 		for _, m := range c.Methods {
 			ret.WriteString(fmt.Sprintf("%s %s_%s(%s);\n", emitReturnTypeCabi(m.ReturnType), cClassName, m.SafeMethodName(), emitParametersCabi(m, cClassName+"*")))
 
-			if m.IsSignal && !m.HasHiddenParams {
+			if m.IsSignal {
 				ret.WriteString(fmt.Sprintf("%s %s_connect_%s(%s* self, void* slot);\n", emitReturnTypeCabi(m.ReturnType), cClassName, m.SafeMethodName(), cClassName))
 			}
 		}
@@ -723,8 +728,10 @@ extern "C" {
 
 			}
 
-			if m.IsSignal && !m.HasHiddenParams {
-				exactSignal := `static_cast<void (` + c.ClassName + `::*)(` + emitParameterTypesCpp(m) + `)>(&` + c.ClassName + `::` + nativeMethodName + `)`
+			if m.IsSignal {
+				// If there are hidden parameters, the type of the signal itself
+				// needs to include them
+				exactSignal := `static_cast<void (` + c.ClassName + `::*)(` + emitParameterTypesCpp(m, true) + `)>(&` + c.ClassName + `::` + nativeMethodName + `)`
 
 				ret.WriteString(
 					`void ` + cClassName + `_connect_` + m.SafeMethodName() + `(` + cClassName + `* self, void* slot) {` + "\n" +

cmd/genbindings/emitgo.go

@@ -540,7 +540,7 @@ import "C"
 			}
 
 			// Add Connect() wrappers for signal functions
-			if m.IsSignal && !m.HasHiddenParams {
+			if m.IsSignal {
 				gfs.imports["unsafe"] = struct{}{}
 				gfs.imports["runtime/cgo"] = struct{}{}
 				ret.WriteString(`func (this *` + goClassName + `) On` + m.SafeMethodName() + `(slot func()) {

cmd/genbindings/intermediate.go

@@ -187,7 +187,7 @@ type CppMethod struct {
 	IsStatic           bool
 	IsSignal           bool
 	IsConst            bool
-	HasHiddenParams    bool // Set to true if there is an overload with more parameters
+	HiddenParams       []CppParameter // Populated if there is an overload with more parameters
 	LinuxOnly          bool
 }
 

cmd/genbindings/transformoptional.go

@@ -32,23 +32,19 @@ func astTransformOptional(parsed *CppParsedHeader) {
 
 			// Add method copies
 			for x := optionalStart; x < len(m.Parameters); x++ {
-				dupMethod := CppMethod{
-					MethodName:         m.MethodName + fmt.Sprintf("%d", x+1),
-					OverrideMethodName: m.MethodName,
-					ReturnType:         m.ReturnType,
-					Parameters:         nil,
-					IsSignal:           m.IsSignal,
-					IsStatic:           m.IsStatic,
-					HasHiddenParams:    (x != len(m.Parameters)-1),
-				}
-				dupMethod.Parameters = append(dupMethod.Parameters, m.Parameters[0:x+1]...)
+				dupMethod := m // copy
+				dupMethod.MethodName = m.MethodName + fmt.Sprintf("%d", x+1)
+				dupMethod.OverrideMethodName = m.MethodName
+				dupMethod.Parameters = m.Parameters[0 : x+1]
+				dupMethod.HiddenParams = m.Parameters[x+1:]
+
 				c.Methods = append(c.Methods, dupMethod) // TODO can we insert them next, instead of at the end?
 			}
 
 			// Truncate the original method's parameters to only the
 			// mandatory ones
+			m.HiddenParams = m.Parameters[optionalStart:]
 			m.Parameters = m.Parameters[0:optionalStart]
-			m.HasHiddenParams = true
 			c.Methods[j] = m
 		}
 
@@ -73,20 +69,16 @@ func astTransformOptional(parsed *CppParsedHeader) {
 
 			// Add ctor copies
 			for x := optionalStart; x < len(m.Parameters); x++ {
-				dupCtor := CppMethod{
-					ReturnType:      m.ReturnType,
-					Parameters:      nil,
-					IsStatic:        m.IsStatic,
-					HasHiddenParams: (x != len(m.Parameters)-1),
-				}
-				dupCtor.Parameters = append(dupCtor.Parameters, m.Parameters[0:x+1]...)
+				dupCtor := m // copy
+				dupCtor.Parameters = m.Parameters[0 : x+1]
+				dupCtor.HiddenParams = m.Parameters[x+1:]
 				c.Ctors = append(c.Ctors, dupCtor)
 			}
 
 			// Truncate the original ctor's parameters to only the
 			// mandatory ones
+			m.HiddenParams = m.Parameters[optionalStart:]
 			m.Parameters = m.Parameters[0:optionalStart]
-			m.HasHiddenParams = true
 			c.Ctors[j] = m
 		}