c - gtk_widget_show_all(窗口);等待函数返回值时不起作用

Question

我正在制作一个飞镖游戏，我已经创建了游戏页面的整个布局。我想等待飞镖击中棋盘，这可能需要不同的时间，然后更新该飞镖的分数，更新玩家剩余的分数，并更新回合分数。

我进行布局，调用gtk_widget_show_all(window);，然后调用await_dart_hit();

直到飞镖击中窗 Eloquent 会显示。就好像窗口在整个函数结束之前无法显示，但我尝试在单独的函数中创建窗口，然后返回，然后调用await_dart_hit();这也行不通。

#include <gtk/gtk.h>

void problem_causing_wait(){
    while(1);
}

void start(){
    GtkWidget *window;

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window),"Start");
    gtk_container_set_border_width(GTK_CONTAINER(window),10);
    gtk_window_set_default_size(GTK_WINDOW(window),1000,400);

    gtk_widget_show_all(window);

    problem_causing_wait();
}

int main(int argc, char *argv[]) {
    GtkWidget *window, *button, *button_box;

    gtk_init(&argc,&argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window),"Welcome!");
    gtk_window_set_default_size(GTK_WINDOW(window),1000,400);

    button_box = gtk_button_box_new(GTK_ORIENTATION_HORIZONTAL);
    gtk_container_add(GTK_CONTAINER(window),button_box);

    button = gtk_button_new_with_label("Get Started");
    g_signal_connect (button, "clicked", G_CALLBACK (start), NULL);
    g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
    gtk_container_add(GTK_CONTAINER(button_box),button);

    gtk_widget_show_all(window);

    gtk_main();

    return(0);
}

如果运行此代码，您会发现一旦单击“开始”按钮，它就会卡住。尽管在调用 Problem_causing_wait() 函数之前显示了所有内容，但它并不显示“开始”窗口。

请帮忙!

编译为:gcc main.c -o main pkg-config --cflags --libs gtk+-3.0

Answer 1

当您的应用程序在单线程中运行时，此函数“problem_causing_wait”充当阻塞函数并停止主循环。

我认为使用“g_idle_add”和“g_thread_new”可能会解决您的问题。

    #include <gtk/gtk.h>

void *problem_causing_wait(){
    while(1);
    //update the Ui using g_idle_add
    return NULL;
}

void start(){
    GtkWidget *window;

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window),"Start");
    gtk_container_set_border_width(GTK_CONTAINER(window),10);
    gtk_window_set_default_size(GTK_WINDOW(window),1000,400);

    g_thread_new("dart-game",problem_causing_wait,NULL);

    gtk_widget_show_all(window);
}

int main(int argc, char *argv[]) {
    GtkWidget *window, *button, *button_box;

        //Initilizes Support for Concurrent Threads
    XInitThreads();

    gtk_init(&argc,&argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window),"Welcome!");
    gtk_window_set_default_size(GTK_WINDOW(window),1000,400);

    button_box = gtk_button_box_new(GTK_ORIENTATION_HORIZONTAL);
    gtk_container_add(GTK_CONTAINER(window),button_box);

    button = gtk_button_new_with_label("Get Started");
    g_signal_connect (button, "clicked", G_CALLBACK (start), NULL);
    //g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
    gtk_container_add(GTK_CONTAINER(button_box),button);

    gtk_widget_show_all(window);

    gtk_main();

    return(0);
}