GTK绘图区域Widget没有使用TinyCore显示在窗口中

Question

我刚刚开始使用TinyCore Linux和GTK+3，并且正在阅读和尝试一系列不同的教程。我正在尝试GTK网站(https://developer.gnome.org/gtk3/stable/ch01s03.html)中的示例代码，但它不起作用。我能够编译，并弹出一个警告：

警告:不建议使用'gdk_window_get_pointer‘(在gdk_window_get_pointer处声明使用'gdk_window_get_device_position’而不是-Wdeprecated声明

当我运行程序时，窗口会弹出，但没有绘图区域。我使用了相同的代码，并在Ubuntu机器上编译了它，它工作得很好，它甚至没有显示关于折旧函数的警告。任何可能导致绘图区域不显示的想法将不胜感激。谢谢你抽出时间来阅读这篇文章。

#include <gtk/gtk.h>

/* Surface to store current scribbles */
static cairo_surface_t *surface = NULL;

static void
clear_surface (void)
{
  cairo_t *cr;

  cr = cairo_create (surface);

  cairo_set_source_rgb (cr, 1, 1, 1);
  cairo_paint (cr);

  cairo_destroy (cr);
}

/* Create a new surface of the appropriate size to store our scribbles */
static gboolean
configure_event_cb (GtkWidget         *widget,
                    GdkEventConfigure *event,
                    gpointer           data)
{
  if (surface)
    cairo_surface_destroy (surface);

  surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
                                               CAIRO_CONTENT_COLOR,
                                               gtk_widget_get_allocated_width (widget),
                                               gtk_widget_get_allocated_height (widget));

  /* Initialize the surface to white */
  clear_surface ();

  /* We've handled the configure event, no need for further processing. */
  return TRUE;
}

/* Redraw the screen from the surface. Note that the ::draw
 * signal receives a ready-to-be-used cairo_t that is already
 * clipped to only draw the exposed areas of the widget
 */
static gboolean
draw_cb (GtkWidget *widget,
         cairo_t   *cr,
         gpointer   data)
{
  cairo_set_source_surface (cr, surface, 0, 0);
  cairo_paint (cr);

  return FALSE;
}

/* Draw a rectangle on the surface at the given position */
static void
draw_brush (GtkWidget *widget,
            gdouble    x,
            gdouble    y)
{
  cairo_t *cr;

  /* Paint to the surface, where we store our state */
  cr = cairo_create (surface);

  cairo_rectangle (cr, x - 3, y - 3, 6, 6);
  cairo_fill (cr);

  cairo_destroy (cr);

  /* Now invalidate the affected region of the drawing area. */
  gtk_widget_queue_draw_area (widget, x - 3, y - 3, 6, 6);
}

/* Handle button press events by either drawing a rectangle
 * or clearing the surface, depending on which button was pressed.
 * The ::button-press signal handler receives a GdkEventButton
 * struct which contains this information.
 */
static gboolean
button_press_event_cb (GtkWidget      *widget,
                       GdkEventButton *event,
                       gpointer        data)
{
  /* paranoia check, in case we haven't gotten a configure event */
  if (surface == NULL)
    return FALSE;

  if (event->button == GDK_BUTTON_PRIMARY)
    {
      draw_brush (widget, event->x, event->y);
    }
  else if (event->button == GDK_BUTTON_SECONDARY)
    {
      clear_surface ();
      gtk_widget_queue_draw (widget);
    }

  /* We've handled the event, stop processing */
  return TRUE;
}

/* Handle motion events by continuing to draw if button 1 is
 * still held down. The ::motion-notify signal handler receives
 * a GdkEventMotion struct which contains this information.
 */
static gboolean
motion_notify_event_cb (GtkWidget      *widget,
                        GdkEventMotion *event,
                        gpointer        data)
{
  /* paranoia check, in case we haven't gotten a configure event */
  if (surface == NULL)
    return FALSE;

  if (event->state & GDK_BUTTON1_MASK)
    draw_brush (widget, event->x, event->y);

  /* We've handled it, stop processing */
  return TRUE;
}

static void
close_window (void)
{
  if (surface)
    cairo_surface_destroy (surface);

  gtk_main_quit ();
}

int
main (int   argc,
      char *argv[])
{
  GtkWidget *window;
  GtkWidget *frame;
  GtkWidget *da;

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (window), "Drawing Area");

  g_signal_connect (window, "destroy", G_CALLBACK (close_window), NULL);

  gtk_container_set_border_width (GTK_CONTAINER (window), 8);

  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
  gtk_container_add (GTK_CONTAINER (window), frame);

  da = gtk_drawing_area_new ();
  /* set a minimum size */
  gtk_widget_set_size_request (da, 100, 100);

  gtk_container_add (GTK_CONTAINER (frame), da);

  /* Signals used to handle the backing surface */
  g_signal_connect (da, "draw",
                    G_CALLBACK (draw_cb), NULL);
  g_signal_connect (da,"configure-event",
                    G_CALLBACK (configure_event_cb), NULL);

  /* Event signals */
  g_signal_connect (da, "motion-notify-event",
                    G_CALLBACK (motion_notify_event_cb), NULL);
  g_signal_connect (da, "button-press-event",
                    G_CALLBACK (button_press_event_cb), NULL);

  /* Ask to receive events the drawing area doesn't normally
   * subscribe to. In particular, we need to ask for the
   * button press and motion notify events that want to handle.
   */
  gtk_widget_set_events (da, gtk_widget_get_events (da)
                             | GDK_BUTTON_PRESS_MASK
                             | GDK_POINTER_MOTION_MASK);

  gtk_widget_show_all (window);

  gtk_main ();

  return 0;
}

Answer 1

我做了一个新的安装，警告信息消失了，但绘图区域仍然拒绝出现。最后，我尝试使用引导代码"xvesa=1280x1024x16“将默认的颜色深度更改为16位颜色深度，并开始显示。我想这意味着这是司机的问题，但我不完全确定。