将 TAB 连接到 gtkEntry

Question

如何使 Tab 键在 GtkEntry 中充当 Enter 键？我能够捕捉到“输入”键和“激活”信号。如何捕获 GtkEntry 的“tab”键？

static void enter(GtkWidget *widget, GtkWidget *entry)
{
  const gchar *entry_text;
  entry_text = gtk_entry_get_text(GTK_ENTRY(entry));
  printf("Entry contents: %s\n", entry_text);
}

entry = gtk_entry_new();
g_signal_connect(entry, "activated", G_CALLBACK(enter), entry);

同样的，当按下tab键时如何得到通知？

Answer 1

您可以注册"key-press-event"的条目或"key-release-event"并在事件回调中检查 GdkEventKey 的键值。您可以使用 gdkkeysyms.h 中定义的宏来检查“Tab”或“Enter”，如下所示:

...
#include <gdk/gdkkeysyms.h>
...
static gboolean
key_press_cb(GtkWidget *w, GdkEvent *ev, gpointer data)
{
    (void)w; (void)data; /* To avoid compiler warnings */
    GdkEventKey *key = (GdkEventKey*)ev;
    if(key) /* Extra check maybe redundant */
    {
        if(key->keyval == GDK_Tab)
            printf(" Tab pressed\n");
        else if (key->keyval == GDK_Return)
                printf(" Enter pressed\n");
    }
    /* Default handling of "Tab" is change of focus.
     * If TRUE is passed here, the event will not be propagated
     */
    return FALSE;
}
...
    entry = gtk_entry_new ();
    g_signal_connect(entry, "key-press-event", G_CALLBACK(key_press_cb), NULL);
...

希望这有帮助!