Holder.connectValidateChange

Connect to ValidateChange signal.

Gets emitted when holder is going to change its value. One can connect to this signal to control which values holder can have (for example to implement some business rules)

class Holder

ulong

connectValidateChange

(

)

(

T callback

Flag!"After" after = No.After

)

if (

isCallable!T &&

is(ReturnType!T == glib.error.ErrorWrap)

(

Parameters!T.length < 1 ||

(

ParameterStorageClassTuple!T[0] == ParameterStorageClass.none &&

is(Parameters!T[0] == gobject.value.Value)

)

(

Parameters!T.length < 2 ||

(

ParameterStorageClassTuple!T[1] == ParameterStorageClass.none &&

is(Parameters!T[1] : gda.holder.Holder)

)

Parameters!T.length < 3

)

Parameters

callback T: signal callback delegate or function to connect
glib.error.ErrorWrap callback(gobject.value.Value newValue, gda.holder.Holder holder)
newValue the proposed new value for holder (optional)
holder the instance the signal is connected to (optional)
Returns NULL if holder is allowed to change its value to new_value, or a #GError otherwise.
after Flag!"After": Yes.After to execute callback after default handler, No.After to execute before (default)

Return Value

Type: ulong

Signal ID