设置GtkTextBuffer中的最大字符数

#include <gtk/gtk.h>

#define MAX_CHARACTERS 100

void on_text_changed(GtkTextBuffer *buffer, gpointer user_data) {
    gchar *text = gtk_text_buffer_get_text(buffer, NULL, -1);
    gsize length = strlen(text);
    g_free(text);

    if (length >= MAX_CHARACTERS) {
        // 清空文本内容
        gtk_text_buffer_set_text(buffer, "", -1);
        
        // 或者禁止继续输入
        // g_signal_stop_emission_by_name(buffer, "insert-text");
    }
}

int main(int argc, char *argv[]) {
    gtk_init(&argc, &argv);

    GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);

    GtkWidget *text_view = gtk_text_view_new();
    GtkTextBuffer *buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(text_view));
    g_signal_connect(buffer, "changed", G_CALLBACK(on_text_changed), NULL);

    gtk_container_add(GTK_CONTAINER(window), text_view);

    gtk_widget_show_all(window);

    gtk_main();

    return 0;
}