// On connects the named signal from obj with the provided function, so that
// when obj next emits that signal, the function is called with the parameters
// the signal carries.
//
// The provided function must accept a number of parameters that is equal to
// or less than the number of parameters provided by the signal, and the
// resepctive parameter types must match exactly or be conversible according
// to normal Go rules.
//
// For example:
//
// obj.On("clicked", func() { fmt.Println("obj got a click") })
//
// Note that Go uses the real signal name, rather than the one used when
// defining QML signal handlers ("clicked" rather than "onClicked").
//
// For more details regarding signals and QML see:
//
// http://qt-project.org/doc/qt-5.0/qtqml/qml-qtquick2-connections.html
//
func (obj *Common) On(signal string, function interface{}) {
funcv := reflect.ValueOf(function)
funct := funcv.Type()
if funcv.Kind() != reflect.Func {
panic("function provided to On is not a function or method")
}
if funct.NumIn() > C.MaxParams {
panic("function takes too many arguments")
}
csignal, csignallen := unsafeStringData(signal)
var cerr *C.error
gui(func() {
cerr = C.objectConnect(obj.addr, csignal, csignallen, obj.engine.addr, unsafe.Pointer(&function), C.int(funcv.Type().NumIn()))
if cerr == nil {
connectedFunction[&function] = true
stats.connectionsAlive(+1)
}
})
cmust(cerr)
}
// On connects the named signal from obj with the provided function, so that
// when obj next emits that signal, the function is called with the parameters
// the signal carries.
//
// The provided function must accept a number of parameters that is equal to
// or less than the number of parameters provided by the signal, and the
// resepctive parameter types must match exactly or be conversible according
// to normal Go rules.
//
// For example:
//
// obj.On("clicked", func() { fmt.Println("obj got a click") })
//
// Note that Go uses the real signal name, rather than the one used when
// defining QML signal handlers ("clicked" rather than "onClicked").
//
// For more details regarding signals and QML see:
//
// http://qt-project.org/doc/qt-5.0/qtqml/qml-qtquick2-connections.html
//
func (obj *Common) On(signal string, function interface{}) {
if obj.connections == nil {
obj.connections = make(map[string]map[uintptr]uintptr)
}
funcv := reflect.ValueOf(function)
funct := funcv.Type()
if funcv.Kind() != reflect.Func {
panic("function provided to On is not a function or method")
}
if funct.NumIn() > C.MaxParams {
panic("function takes too many arguments")
}
csignal, csignallen := unsafeStringData(signal)
var cerr *C.error
var connection uintptr
RunMain(func() {
cerr = C.objectConnect(
obj.addr,
csignal,
csignallen,
obj.engine.addr,
unsafe.Pointer(&function),
C.int(funcv.Type().NumIn()),
(*unsafe.Pointer)(unsafe.Pointer(&connection)),
)
if cerr == nil {
table, exists := obj.connections[signal]
if exists == false {
table = make(map[uintptr]uintptr)
obj.connections[signal] = table
}
table[funcv.Pointer()] = connection
connectedFunction[&function] = true
stats.connectionsAlive(+1)
}
})
cmust(cerr)
}