设置对话框的默认按钮

It seems that GtkDialog automatically sets the focus on the left-most button (which is "Cancel" in my case). I want to change this default focus to another button, but I cannot go the route of "gtk_dialog_set_default_response" because I have packed the buttons manually into the dialogs action area.

GtkDialog似乎自动将焦点放在最左边的按钮(在我的例子中是“Cancel”)上。我想将这个默认焦点更改为另一个按钮，但是我不能使用“gtk_dialog_set_default_response”的路径，因为我已经将按钮手工打包到dialogs操作区域。

Then, while searching the API doc up and down, I realized that GtkDialog is a descendent of GtkWindow, and thus tried "gtk_window_set_default", which at first gave me some sort of "assertion `gtk_widget_get_can_default (default_widget)' failed" warning. To comply, I used "gtk_widget_set_can_default" on the button, and the warning disappeared.. BUT: the focus is still being set on the "Cancel" button.

然后，在上下搜索API doc时，我意识到GtkDialog是GtkWindow的后代，因此尝试了“gtk_window_set_default”，这首先给了我某种“断言”gtk_widget_can_default (default_widget)“失败”警告。为了遵守，我在按钮上使用了“gtk_widget_set_can_default”，警告消失了。但是:焦点仍然在“取消”按钮上。

Is there really no way other than having to use "gtk_dialog_add_action_widget"?

难道真的只有使用“gtk_dialog_add_action_widget”才能解决问题吗?

1 个解决方案

#1

Just use gtk_widget_grab_focus on the widget which you want to have focus on. The widget has to be focusable, which is true by default in case of a button. Here is a sample code for your reference:

只需将gtk_widget_grab_focus放在您想要关注的小部件上。小部件必须是可调焦的，这在按钮的情况下是默认的。这里有一个示例代码供您参考:

#include <gtk/gtk.h>

/* Uncomment the below macro to see the default focus */
//#define DEFAULT_FOCUS 

int main(void)
{
    gtk_init (NULL, NULL);
#ifdef DIALOG_WITH_BUTTONS
    GtkWidget * dialog = gtk_dialog_new_with_buttons ("Dialog",
                    NULL,
                    GTK_DIALOG_MODAL,
                    GTK_STOCK_CANCEL,
                    GTK_RESPONSE_CANCEL,
                    GTK_STOCK_OK,
                    GTK_RESPONSE_OK,
                    NULL);
#ifndef DEFAULT_FOCUS
    gtk_widget_grab_focus(gtk_dialog_get_widget_for_response(GTK_DIALOG(dialog), GTK_RESPONSE_OK));
#endif

#else
    GtkWidget *dialog = gtk_dialog_new();
    gtk_window_set_title(GTK_WINDOW(dialog), "Dialog");
    GtkWidget *action_area = gtk_dialog_get_action_area(GTK_DIALOG(dialog));
    GtkWidget *ok_button = gtk_button_new_with_label("OK");
    GtkWidget *cancel_button = gtk_button_new_with_label("Cancel");
    gtk_container_add(GTK_CONTAINER(action_area), cancel_button);
    gtk_container_add(GTK_CONTAINER(action_area), ok_button);
    gtk_widget_show_all(dialog);
#ifndef DEFAULT_FOCUS
    gtk_widget_grab_focus(ok_button);
#endif

#endif
    g_signal_connect(dialog, "destroy", G_CALLBACK(gtk_main_quit), NULL);
    gtk_dialog_run(GTK_DIALOG(dialog));
    gtk_main();
    return 0;
}

Hope this helps!

希望这可以帮助!