Package org.gnome.gtk

Interface SpinButton.OutputCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

SpinButton

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public static interface SpinButton.OutputCallback
extends FunctionPointer

Functional interface declaration of the OutputCallback callback.

See Also:

• run()

Method Summary

Modifier and Type	Method	Description
boolean	run()	Emitted to tweak the formatting of the value for display.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment) method.
default int	upcall(MemorySegment sourceSpinButton)	The upcall method is called from native code.

Method Details

run

boolean run()

Emitted to tweak the formatting of the value for display.

// show leading zeros
 static gboolean
 on_output (GtkSpinButton *spin,
            gpointer       data)
 {
    char *text;
    int value;

    value = gtk_spin_button_get_value_as_int (spin);
    text = g_strdup_printf ("%02d", value);
    gtk_editable_set_text (GTK_EDITABLE (spin), text):
    g_free (text);

    return TRUE;
 }
 

upcall

default int upcall(MemorySegment sourceSpinButton)

The upcall method is called from native code. The parameters are marshaled and run() is executed.

toCallback

default MemorySegment toCallback(Arena arena)

Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment) method.

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the function pointer will be allocated in this arena

Returns:

the native function pointer