GTK gossip: gtimer

Gtimer is a timer, which can be used whenever you need to specify two periods of time. For example, the start time and end time of the program line, you can use g_timer_new () to create a new gtimer. If you no longer need it, use g_timer_destroy () to renew it.

After g_timer_new (), the automatic scaling time is displayed. You can also use g_timer_start () to re-mark the scaling time, and at g_timer_elapsed () the time after the callback is triggered.

If
Use g_timer_start () to indicate the time when the cursor is triggered, and use g_timer_end () to indicate the end time.
When g_timer_elapsed () is called, it will return to the gap between the time after the operation and the end time. After g_timer_end () is used to indicate the end time, you can use g_timer_continue () to re-compile gtimer.

The following program is a simple example. You can calculate the time interval between two instances:

• G_timer_demo.c

#include <gtk/gtk.h>

void button_pressed(GtkButton *button, GTimer *timer) {
    static gdouble elapsedTime;
    static gboolean isRunning = FALSE;
    
    if(isRunning) {
        elapsedTime = g_timer_elapsed(timer, NULL);
        gtk_button_set_label(button, "Start");
        g_print("Elapsed Time: %f s/n", elapsedTime);
    }
    else {
        g_timer_start(timer);
        gtk_button_set_label(button, "Stop");
    }

    isRunning = !isRunning;
}

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

    gtk_init(&argc, &argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window), "GTimer");
    gtk_window_set_default_size(GTK_WINDOW(window), 150, 50);

    button = gtk_button_new_with_label("Start");

    gtk_container_add(GTK_CONTAINER(window), button);

    timer = g_timer_new();

    g_signal_connect(GTK_OBJECT(button), "clicked",
                     G_CALLBACK(button_pressed), timer);

    g_signal_connect(GTK_OBJECT(window), "destroy",
                     G_CALLBACK(gtk_main_quit), NULL);

    gtk_widget_show_all(window);

    gtk_main();

    return 0;
}

The result of a line is as follows: